Journal articles: 'Stripping column'

1

Aujesky, A. "Fully Automated Stripping Column." IFAC Proceedings Volumes 26, no. 2 (July 1993): 235–38. http://dx.doi.org/10.1016/s1474-6670(17)48461-8.

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Nur, Muhammad, Edi Munawar, and Mariana Mariana. "Recovery Process of Condensate the Ammonia Wastewater Plant of PT.PIM with A Combination of Technology Air Stripping Jet Bubble Colum, Advance Oxidation process and Ion Exchange Resin." Jurnal Rekayasa Kimia & Lingkungan 12, no. 1 (May 25, 2017): 8. http://dx.doi.org/10.23955/rkl.v12i1.5503.

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Abstract Study of reducing the content of ammonia, carbon dioxide and organic contaminants in wastewater process condensate using a combination of technologies of water Jet Stripping Bubble Colum, Advance Oxidation Process and Ion Exchange Resin have been done. The aims of this research is to look the effect of hydraulic resident time in Jet Stripping Bubble Colum and the amount of the addition of Ozon/H2O2 to reduction the content of carbon dioxide and organic contaminants as well as ammonia removal with ion exchange resin on the process condensate so that can be reuse as boiler feed water in ammonia plant of PT. PIM. This research was conducted using a combination Air Stripping Jet Bubble Colum, Advance Oxidation Process and Ion Exchange Resin which equipped with water and air flows adjustment. The water flow enter the column, pressure of the Colum and diameter of nozzle was maintained constantnts during experiment, while the air flow rate enter to the column, H2O2/O3 concentrations and the hydraulic retention time was vary respectively. The results showed that the water Jet Stripping Bubble Colum at 50 Psi air pressure capable of achieving CO2 lowers 87.60% and ammonia to 65.31%. AOP technology capable of lowering the content of organic contaminant to 80.71% with the addition of hydrogen peroxide 8,000 ppm with a residence time 180 minutes. While the ammonia remaining in the water the process of condensate action exchange resin using eliminated with a reduction of ammonia reached 98.57%, so that the recovery process of water condensate technology uses a combination of Air Stripping Jet Bubble Colum, Advance Hydrocarbon processes (AOP) and Ion Exchange Resins already meets the requirements of viable reuses boiler feed water. The ammonia reduction was determined by using ASTM-D 1426 method, the carbon dioxide by using ASTM-512 method, and the organic contaminants by using titrimetric method (SII-0071). Keyword : Air Stripping Jet Bubble Colum, Advance Oxidation Process (AOP), Ammonia Removal, Carbon Dioxide Removal.

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Zakharov, Mikhail K., Yuri A. Pisarenko, and Oksana I. Sycheva. "COMPARISON OF ENERGY SAVING METHODS FOR DISTILLATION OF LIQUID MIXTURES." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 1 (December 9, 2020): 85–92. http://dx.doi.org/10.6060/ivkkt.20216401.6141.

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The analysis and review of the scientific literature on methods and approaches to energy saving in distillation, as one of the most energy-intensive processes for the separation of binary and multicomponent mixtures was carried out. Directions of the scientific literature are highlighted, showing the relevance of the thermodynamic method assessment of separation processes. A comparative analysis of various methods of energy conservation in the separation of liquid binary mixtures by the distillation method is performed (a binary mixture of benzene-toluene was chosen as an example). A conventional distillation column as well as a column with a heat pump and a column with heat integration were considered. As a result of the calculation experiment for each option performed using the Aspen Plus software package the optimal column parameters were determined - the total number of stages and the position of feed stage. The heat consumption in the column boiler was taken as the objective function. It is also shown that with the same characteristics of the columns, the best way to organize the process for separating the selected mixture is to compress the steam stream from rectifying profile of the column with its subsequent use in the boiler of the stripping profile according to the principle of a heat pump. It was established by a calculation experiment that heat integration by compressing steam from rectifying profile of the column and supplying it to the stripping profile gives significantly less energy saving. The calculation of internal energy saving by distillation column was carried out and it was shown that the distributed heat removal from the plates of the rectifying profile of the column and the supply of this heat to the stripping profile plates reduces internal energy saving and leads to an additional increase in heat consumption in the boiler.

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Zakharov, Mikhail K., Yuri A. Pisarenko, and Oksana I. Sycheva. "COMPARISON OF ENERGY SAVING METHODS FOR DISTILLATION OF LIQUID MIXTURES." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 1 (December 9, 2020): 85–92. http://dx.doi.org/10.6060/ivkkt.20216401.6141.

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The analysis and review of the scientific literature on methods and approaches to energy saving in distillation, as one of the most energy-intensive processes for the separation of binary and multicomponent mixtures was carried out. Directions of the scientific literature are highlighted, showing the relevance of the thermodynamic method assessment of separation processes. A comparative analysis of various methods of energy conservation in the separation of liquid binary mixtures by the distillation method is performed (a binary mixture of benzene-toluene was chosen as an example). A conventional distillation column as well as a column with a heat pump and a column with heat integration were considered. As a result of the calculation experiment for each option performed using the Aspen Plus software package the optimal column parameters were determined - the total number of stages and the position of feed stage. The heat consumption in the column boiler was taken as the objective function. It is also shown that with the same characteristics of the columns, the best way to organize the process for separating the selected mixture is to compress the steam stream from rectifying profile of the column with its subsequent use in the boiler of the stripping profile according to the principle of a heat pump. It was established by a calculation experiment that heat integration by compressing steam from rectifying profile of the column and supplying it to the stripping profile gives significantly less energy saving. The calculation of internal energy saving by distillation column was carried out and it was shown that the distributed heat removal from the plates of the rectifying profile of the column and the supply of this heat to the stripping profile plates reduces internal energy saving and leads to an additional increase in heat consumption in the boiler.

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Nisa, Nur Ihda Farikhatin, Ali Altway, and Susianto S. "Simulasi Unit Stripping CO2 Dalam Packed Column Skala Industri Dengan Kondisi Non-Isothermal." Jurnal Rekayasa Kimia & Lingkungan 14, no. 1 (June 21, 2019): 53–62. http://dx.doi.org/10.23955/rkl.v14i1.13547.

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Emisi karbondioksida ke atmosfer dianggap sebagai penyebab utama perubahan iklim, termasuk pemanasan global dan permasalahan pertanian. Berbagai teknologi pemisahan CO2 banyak dikembangkan. Absorpsi kimia adalah teknologi pemisahan yang paling efektif dan banyak digunakan dalam industri kimia maupun petrokimia. Dimana pelarut yang telah digunakan dapat di regenerasi kembali di kolom stripper. Stripping adalah proses regenerasi termal pelarut dimana larutan tersebut dikontakkan dengan pelarut gas yang tidak larut terhadap cairan tersebut. Penelitian ini bertujuan untuk mengembangkan simulasi unit stripping CO2 dalam packed column skala industri dengan mengestimasi kinerja unit stripping CO2 yang dinyatakan dengan % efisiensi kolom stripping dan komposisi gas yang keluar dari stripper. Simulasi dilakukan secara teoritis dengan mengembangkan model matematis untuk proses stripping CO2 dalam packed column skala industri. Selanjutnya hasil simulasi divalidasi dengan data riil pada salah satu industri pupuk di Indonesia. Variabel-variabel yang digunakan adalah tekanan operasi kolom, temperatur rich solution dan laju steam. Hasil simulasi untuk tekanan stripper 2,56 atm dengan laju rich solution 2943316 kg/jam dan temperatur rich solution 390 K menunjukkan CO2 (% mol) 99,038%, sedangkan data pabrik menunjukkan 97,5862%.

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Barnhart, M. Christopher. "An Improved Gas-Stripping Column for Deoxygenating Water." Journal of the North American Benthological Society 14, no. 2 (June 1995): 347–50. http://dx.doi.org/10.2307/1467786.

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7

Wang, Zhen, Wei Wei Li, and Hui Peng Zhao. "Effect of Adding Pump-Around Circuits and Reducing Stripping Steam Flow Rate on the Improving Energy Efficiency and Increasing Processing Capacity of the Atmospheric Column." Advanced Materials Research 550-553 (July 2012): 939–42. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.939.

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This paper discusses the effect of adding pump-around circuits and reducing stripping steam flow rate on the improving energy efficiency and increasing processing capacity of the atmospheric column in a refinery plant by using commercial simulator. It is shown that both the capacity and energy efficiency of the atmospheric column can be increased by adding pump-around circuits and reducing stripping steam flow rate. The modifications discussed in this paper will affect the separation of the atmospheric column in some way. However, the product qualities can still meet the specifications, if the changes of the parameters are not significant. Therefore, the above issues should be considered in the modifications overall.

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Xiao, Jian Ping, and Tong Song. "The Application of Cascade Control Based on DMC in Stripping Section Temperature Control System." Applied Mechanics and Materials 651-653 (September 2014): 891–94. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.891.

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Predictive control is one of the robust control algorithms that suitable for computerized implementation, and requests lower accuracy of the model. It has been widely used in process control recently. Considering the features of distillation column stripping section, such as complex internal mechanism, time-varying parameters and large time delay, the DMC-PID cascade control strategy is adopted. The simulation results show that this strategy combined the advantages of predictive control and cascade control, can make distillation column stripping section have good dynamic and static characteristic in the presence of external disturbance and time delay. The performances are better than DMC and conventional PID control.

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9

Deng, Qiaosi, Elsayed Elbeshbishy, and Hyung-Sool Lee. "Simultaneous regeneration of exhausted zeolite and nitrogen recovery using an air stripping method at alkaline pH." Water Quality Research Journal 51, no. 4 (July 20, 2016): 321–30. http://dx.doi.org/10.2166/wqrjc.2016.007.

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Ammonium nitrogen recovery using natural zeolite from the permeates of anaerobic membrane bioreactors was investigated with batch and continuous experiments. Regeneration of exhausted zeolite was compared between mechanical shaking and air stripping, and experimental results showed the superiority of air stripping over the shaking. Liquid circulation and air flow rates were optimized in a continuous zeolite-packed column with a separate recovery system consisting of a regeneration chamber and a stripping column. The liquid circulation rate had significant effect neither on the regeneration efficiency (RE) nor the ammonia transfer efficiency (ATE), while the ATE significantly increased with increasing air flow rate. The effect of pH on ammonia recovery was also tested and the results showed that both RE and ATE significantly improved at alkaline pH. When pH increased from 9.5 to 12, the RE increased from 9.2% to 84% and the ATE increased from 54% to 92%. The results emphasized that the pH should be higher than 11 for efficient regeneration and recovery of ammonia. The preliminary economic analysis showed the superiority of the alkaline regeneration–air stripping process over the high pH regeneration and the conventional regeneration.

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Kim, Eun Ju, Ho Kim, and Eunsil Lee. "Influence of Ammonia Stripping Parameters on the Efficiency and Mass Transfer Rate of Ammonia Removal." Applied Sciences 11, no. 1 (January 5, 2021): 441. http://dx.doi.org/10.3390/app11010441.

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This study analyzed the influence of different ammonia stripping parameters on ammonia removal efficiency and mass transfer rate. Ammonia stripping was performed on two devices, a column and a packed tower, with artificial ammonium hydroxide wastewater. First, ammonia concentration and pH were varied in a column without liquid circulation. At the same pH, the removal efficiency and mass transfer rate were constant, irrespective of initial ammonia concentration. When pH was increased, the ammonia fraction also increased, resulting in higher removal efficiency and mass transfer rate. Second, the effects of stripping were assessed using a packed tower with fluid circulation. The ammonium hydroxide concentration did not affect the removal efficiency or mass transfer rate. Furthermore, at apparatus liquid-gas ratios of 26.8–107.2 L/m3, a lower liquid-gas ratio led to increased ammonia removal efficiency and mass transfer rate. Conversely, the lower the liquid-gas ratio, the greater the air consumption. In conclusion, considering the removal rate and volume of air supply, the range of optimal liquid-gas ratio was determined as 26.8–53.6 L/m3. In particular, the 26.8 L/m3 condition achieved the best ammonia removal rate of 63.0% through only 6 h of stripping at 70 °C and pH 8.5.

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Sun, Lan Yi, Jun Li, Xue Nuan Liu, and Qing Song Li. "Sensitivity Analysis of an Energy-Efficient Heat Coupled Distillation Column." Advanced Materials Research 219-220 (March 2011): 424–27. http://dx.doi.org/10.4028/www.scientific.net/amr.219-220.424.

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In this paper, an energy-efficient heat coupled distillation column (HCDC) which is industrially viable is constructed for propylene–propane mixture separation and the sensitivity analysis was performed. Some comparative studies are made with conventional distillation column (CC) and a column with a vapor recompression system (VRC). The results show that the thermal efficiency of the HCDC appears to be strongly sensitive to the compression ratio between rectification section and stripping section.

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Silva, Rodrigo F., and Luiz Mário N. Góis. "Removal of MVC from PVC Resin Using a Stripping Column." International Review of Chemical Engineering (IRECHE) 6, no. 2 (March 31, 2014): 89. http://dx.doi.org/10.15866/ireche.v6i2.1229.

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13

Akiyama, Y., K. T. Valsaraj, D. M. Wetzel, and D. P. Harrison. "On the Performance of a Cascade Crossflow Air Stripping Column." Industrial & Engineering Chemistry Research 35, no. 10 (January 1996): 3597–606. http://dx.doi.org/10.1021/ie960178n.

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Li, Guoqing, Dan Gao, and Junjun Shi. "A New Stripping Column Process and Optimization of Its Operation." Chemical Engineering & Technology 39, no. 12 (June 27, 2016): 2229–37. http://dx.doi.org/10.1002/ceat.201500683.

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Kasuno, Megumi, Hitomi Osuga, Katsuya Shina, and Takuya Yamazaki. "Coulometric Anodic Stripping Voltammetry of Lead at Copper Column Electrode." Electroanalysis 33, no. 6 (March 16, 2021): 1502–9. http://dx.doi.org/10.1002/elan.202060481.

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16

Leverenz, Harold, Russel Adams, Jessica Hazard, and George Tchobanoglous. "Continuous Thermal Stripping Process for Ammonium Removal from Digestate and Centrate." Sustainability 13, no. 4 (February 18, 2021): 2185. http://dx.doi.org/10.3390/su13042185.

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The state of California has passed legislation to divert organic materials from landfills to reduce the emission of methane to the atmosphere. A large amount of this source separated organic (SSO) material is expected to be used as a feedstock for anaerobic digestion processes. Based on a review of properties for likely SSO feedstocks, it is clear that while SSO are high in volatile solids, they are also concentrated sources of nutrients (principally, ammonium). When SSO feedstocks are digested, these nutrients are released into the digestate, where ammonium can cause problems both within the digester and in downstream treatment processes. The focus of this paper is on the performance of two pilot studies designed to remove ammonia from a digester effluent. The process used in the study is a thermal stripping column with tray configuration, operating under a vacuum. In the first study, food waste digestate was treated as a slurry in the stripping column with and without NaOH addition. At process temperatures near 90 °C, the performance with and without caustic was similar. In the second study, centrate from a co-digestion facility, that blends food processing waste with wastewater process solids, was treated in the same thermal stripping column under the same conditions and without chemical addition. The results from both studies, which can be described using the same performance curves, are presented and discussed in this paper.

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Sun, Lan Yi, Jun Li, Xue Nuan Liu, and Qing Song Li. "Reducing Energy Consumption in Propylene-Propane Separation with Heat Coupled Distillation." Advanced Materials Research 225-226 (April 2011): 500–503. http://dx.doi.org/10.4028/www.scientific.net/amr.225-226.500.

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The heat coupled distillation column which applies the principle of internal heat integration between the rectifying section and the stripping section of a distillation column by increasing the temperature of the rectifying section with a compressor attracts extensive attention worldwide for its high thermodynamic efficiency. In this study, the economic features of a heat coupled distillation column (HCDC) are investigated and compared to a conventional column and a commercial column with vapor recompression system (VRC) for the separation of propylene-propane mixture. The economic analysis indicates that HCDC has 10 – 20 % total annual cost (TAC) saving associated with VRC, which appeared to be strongly sensitive to the pressure ratio.

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Qirom, Muhammad, Antonius Indarto, and I. Arsa Putrawan. "Case Studies Thermal Analysis of HP Condensate Stabilizer Column." Applied Mechanics and Materials 493 (January 2014): 27–32. http://dx.doi.org/10.4028/www.scientific.net/amm.493.27.

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The HP condensate stabilizer column is located in the condensate stabilizer unit that functions to recover light hydrocarbons from feed. The HP condensate stabilizer column is a stripping column equipped with 15 trays, condenser, reboiler and a pump-around. The main purpose of HP column is to recover propane and butane components from feed condensate by a distillation process. This process is conducted by heating the liquid in the bottom of the column using steam. The amount of heat supplied is depend on the mass and heat balance in the column based on the targeted product quality from the bottom of the column. The product quality measured is Reid Vapor Pressure (RVP) that indicate the volatility characteristics of bottom product.

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Cypes, Stephen H., and J. R. Engstrom. "Analysis of a toluene stripping process: a comparison between a microfabricated stripping column and a conventional packed tower." Chemical Engineering Journal 101, no. 1-3 (August 2004): 49–56. http://dx.doi.org/10.1016/j.cej.2003.10.014.

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Jenkins, D. H., D. A. McCallum, R. Ruzbacky, S. Saunders, and A. K. Brent. "Air stripping of ammonia and methanol in a bubble-cap column." Environmental Progress 26, no. 4 (2007): 365–74. http://dx.doi.org/10.1002/ep.10235.

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Velázquez, Carols, and L. Antonio Estévez. "Stripping of trihalomethanes from drinking water in a bubble-column aerator." AIChE Journal 38, no. 2 (February 1992): 211–18. http://dx.doi.org/10.1002/aic.690380206.

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Rodríguez-Maroto, J. M., C. Gómez-Lahoz, D. J. Wilson, and Ann N. Clarke. "Removal of Semivolatiles from Soils by Steam Stripping. III. Steam Dynamics and the Stripping of Contaminants in a Column." Separation Science and Technology 30, no. 3 (February 1995): 317–36. http://dx.doi.org/10.1080/01496399508013874.

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23

Ellersdorfer, Markus. "The ion-exchanger–loop-stripping process: ammonium recovery from sludge liquor using NaCl-treated clinoptilolite and simultaneous air stripping." Water Science and Technology 77, no. 3 (November 20, 2017): 695–705. http://dx.doi.org/10.2166/wst.2017.561.

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Abstract The technical feasibility of an ammonium recovery process (‘ion-exchanger–loop-stripping’) for sludge liquor from municipal wastewater treatment plants is examined. The proposed process combines ion-exchange on natural zeolites with simultaneous air stripping of ammonia to produce an industrial NOx-removal agent. Column experiments with continuously recycled NH4Cl-solutions and a real sludge liquor sample were conducted to determine basic ion-exchange kinetics of the applied clinoptilolite. Mass balances of consecutive loading/regeneration cycles show the positive influence of NaCl-pretreatment as well as simultaneous air stripping on the NH4+-exchange capacities. Removal rates for NH4+ between 61.5 and 84.6% were achieved at NH4+-concentrations typical for sludge liquor (900 to 2,300 mg L−1). Zeolite loadings ranged from 5 to 8 mg NH4+ g−1 after 90 min of loading. Regeneration rates were between 42.9 and 49.7%, but increased to 64.8% with simultaneous air stripping. A minimal decrease in the ammonium removal rate was observed as a result of matrix effects in sludge liquor (e.g. flocculants, competing ions). Liquid analyses showed a considerable phosphate-reduction in the sludge liquor sample after ion-exchange due to potential struvite or apatite precipitation. The obtained results enable a detailed design, scale-up and further optimization of the ion-exchanger–loop-stripping process in future.

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Andlar, Martina, Damir Oros, Tonči Rezić, Roland Ludwig, and Božidar Šantek. "In-Situ Vacuum Assisted Gas Stripping Recovery System for Ethanol Removal from a Column Bioreactor." Fibers 6, no. 4 (November 9, 2018): 88. http://dx.doi.org/10.3390/fib6040088.

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A three-step process consisting of biomass hydrolysis, fermentation and in-situ gas stripping by a vacuum assisted recovery system, was optimized to increase the ethanol production from sugar beet pulp. The process combines the advantages of stripping and vacuum separation and enhances the fermentation productivity through in-situ ethanol removal. Using the design of experiment and response surface methodology, the effect of major factors in the process, such as pressure, recycling ratio and solids concentration, was tested to efficiently remove ethanol after the combined hydrolysis and fermentation step. Statistical analysis indicates that a decreased pressure rate and an increased liquid phase recycling ratio enhance the productivity and the yield of the strip-vacuum fermentation process. The results also highlight further possibilities of this process to improve integrated bioethanol production processes. According to the statistical analysis, ethanol production is strongly influenced by recycling ratio and vacuum ratio. Mathematical models that were established for description of investigated processes can be used for the optimization of the ethanol production.

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O’Haver, John H., Robert Walk, Boonyarach Kitiyanan, Jeffrey H. Harwell, and David A. Sabatini. "Packed Column and Hollow Fiber Air Stripping of a Contaminant-Surfactant Stream." Journal of Environmental Engineering 130, no. 1 (January 2004): 4–11. http://dx.doi.org/10.1061/(asce)0733-9372(2004)130:1(4).

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Lubilanji Mulopo, Jean, Diane Hildebrandt, David Glasser, Brendon Hausberger, and Shezaad Kauchali. "Experimental simulation of distillation concentration profiles using batch apparatus: Column stripping section." Chemical Engineering Science 60, no. 24 (December 2005): 6815–23. http://dx.doi.org/10.1016/j.ces.2005.05.061.

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Shamspur, Tayebeh, and Ali Mostafavi. "Flame Atomic Absorption Spectrometry Determination of Trace Amount of Cobalt (II) After Preconcentration Using Modified Analcime Zeolite Loaded with bis(2-Hydroxy-1-Naphthaldimine)N-diethylene-triamine." Journal of AOAC INTERNATIONAL 92, no. 4 (July 1, 2009): 1203–7. http://dx.doi.org/10.1093/jaoac/92.4.1203.

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Abstract A simple and sensitive flame atomic absorption spectrometry technique was developed for the determination of trace amounts of cobalt (Co) in various samples after adsorption on modified analcime using a recently synthesized tetradentate Schiff base ligand, bis(2-hydroxy-1-naphthaldimine)N-diethylene-triamine, by a column method in the pH range of 5 to 7, with a flow rate of 1 mL/min. The influence of flow rates of the stripping and sample solution, the amount of ligand, types of stripping, and the least amount of eluent required for elution of the Co ion from the column were investigated. The effects of interfering ions on the recovery of Co were studied. The method was successfully applied for determination of Co in water and plant samples. The maximum capacity of the modified sorbent was found to be 0.58 mg/g of Co(II); the preconcentration factor was 250. Linearity was maintained at 0.240 g/L in the original solution. The LOD was 1.44 102 g/L in the original solution.

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Diaz, Jonathan, and Kenji Bekki. "The Effect of Drag from the Galactic Hot Halo on the Magellanic Stream and Leading Arm." Publications of the Astronomical Society of Australia 28, no. 2 (2011): 117–27. http://dx.doi.org/10.1071/as10044.

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AbstractWe study the effect of drag induced by the Galactic hot halo on the two neutral hydrogen (HI) cloud complexes associated with the Large and Small Magellanic Clouds: the Magellanic Stream (MS) and the Leading Arm (LA). In particular, we adopt the numerical models of previous studies and re-simulate the tidal formation of the MS and LA with the inclusion of a drag term. We find that the drag has three effects which, although model-dependent, may bring the tidal formation scenario into better agreement with observations: correcting the LA kinematics, reproducing the MS column density gradient, and enhancing the formation of MS bifurcation. We furthermore propose a two-stage mechanism by which the bifurcation forms. In general, the inclusion of drag has a variety of both positive and negative effects on the global properties of the MS and LA, including their on-sky positions, kinematics, radial distances, and column densities. We also provide an argument which suggests that ram-pressure stripping and tidal stripping are mutually exclusive candidates for the formation of the MS and LA.

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TIAN, W. D., and S. L. SUN. "MODEL DECOMPOSITION BASED ABNORMAL PARAMETER ESTIMATION FOR DISTILLATION COLUMN." Latin American Applied Research - An international journal 48, no. 2 (March 30, 2018): 81–87. http://dx.doi.org/10.52292/j.laar.2018.263.

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Parameter estimation method can produce useful physical parameters in finding abnormal causes, but nonlinear model makes this method computationally intensive and non-robust for distillation scenario. In this paper, we propose a model decomposition based parameter estimation method for distillation column diagnosis purposes. Nonlinear first principles dynamic model is divided into some disjoint submodels through occurrence matrix analysis. The whole model is used to monitor distillation process and the submodel that gives the highest contribution to the generated residual is selected to perform abnormal parameter estimation. Application results from stripping tower in the popular Tennessee Eastman challenge problem show that the model decomposition based diagnosis scheme is more time-saving and robust than pure nonlinear model based scheme.

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Chiang, Pen-C., Chung-H. Hung, J. C. Mar, and E. E. Chang. "Henry's constants and mass transfer coefficients of halogenated organic pollutants in an air stripping packed column." Water Science and Technology 38, no. 6 (September 1, 1998): 287–94. http://dx.doi.org/10.2166/wst.1998.0263.

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Both Henry's constants and volumetric mass transfer coefficients (KLa) of eight priority chlorinated organic compounds including 1,1-dichloroethene, methylene chloride, chloroform, carbon tetrachloride, 1,1,1-trichloroethane, trichloroethylene, tetrachloroethylene, and 1,4-dichlorobenzene in an air stripping packed column were investigated in this study. The liquid and gas phase EPICS (Equilibrium Partition in Closed System) and direct calculating methods were applied to determine the Henry's constants of VOCs. The interference of co-solute on Henry's constants was also investigated. Experimental results indicated that decrease in Henry's constants of VOCs was observed in the presence of humic acid but no apparent effect on Henry's constants was detected when there was NaCl and surfactant in solution. Four different configurations of packing media including Intalox Saddle, Super Intalox Saddle, Telleret, and Hedgehog made of polypropylene were respectively packed in the air stripping tower and investigated in the study. The dependence of hydraulic loading, air-water ratio, and configurations of packing media on mass transfer coefficients of VOCs was discussed.

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Teichgräber, Burkhard, and Andreas Stein. "Nitrogen elimination from sludge treatment reject water – comparison of the steam-stripping and denitrification processes." Water Science and Technology 30, no. 6 (September 1, 1994): 41–51. http://dx.doi.org/10.2166/wst.1994.0251.

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Steam stripping and nitrification/denitrification for the elimination of nitrogen from sludge treatment reject water from the Central Sludge Treatment Facilities (CSTF) of the Emschergenossenschaft in Bottrop were tested in half-scale pilot plants. More than 90% efficiency could be achieved with both systems; the nitrification/denitrification process also removed organic nitrogen. Operational experience has shown that full scale application of both systems is possible. The design surface load of the stripping column has been evaluated as 10 m3/(m2*h) and the steam/water ratio as 0.12 t/m3. The nitrification/denitrification process can be designed for 0.07 kgN/(kg MLSS*d) and 1.4 days hydraulic retention time. Total treatment costs are estimated to be between 5 and 7.5 DM/kg N.

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Shankar, R. Siva, and K. Somasundaram. "Skull Stripping Using Pixel Affinity Graph Method for MRI Head Scans." International Journal of Engineering & Technology 7, no. 2.22 (April 28, 2018): 49. http://dx.doi.org/10.14419/ijet.v7i2.22.12262.

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Skull stripping from Magnetic Resonance Image (MRI) of human head scan gives strong impact in clinical diagnosis. The Pixel affinity graph method is used as preprocessing technique, and it is applied on adjacent pixels in each row and column of the middle slice of MRI volume. By grouping the subsets through affinity on intensity found in pixels on the graph (PAG), we can locate the large connected brain portion as subset in the image. After the region of interest is located, Skull is stripped and brain portion is segmented. The proposed PAG based algorithm is validated by comparing the results obtained by the popular automated skull stripping method, Brain Extraction Tool (BET). The qualitative and quantitative results show that the proposed algorithm giving better results.

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Taylor, Frank, Michael J. Kurantz, Neil Goldberg, and James C. Craig. "Control of packed column fouling in the continuous fermentation and stripping of ethanol." Biotechnology and Bioengineering 51, no. 1 (March 26, 2000): 33–39. http://dx.doi.org/10.1002/(sici)1097-0290(19960705)51:1<33::aid-bit4>3.0.co;2-1.

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Arhipova, Natalija, Aris Jansons, Astra Zaluma, Talis Gaitnieks, and Rimvydas Vasaitis. "Bark stripping of Pinus contorta caused by moose and deer: wounding patterns, discoloration of wood, and associated fungi." Canadian Journal of Forest Research 45, no. 10 (October 2015): 1434–38. http://dx.doi.org/10.1139/cjfr-2015-0119.

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The aim of this study was to assess the extent of bark stripping wounds, subsequent wood discoloration, and associated fungi in 30-year-old Pinus contorta Douglas ex Loudon stems damaged by large game. In total, 90 trees were evaluated, and 170 bark stripping wounds of different ages (1–20 years) were measured. From each wound, wood samples were collected for subsequent fungal isolation. Thirty trees were cut to evaluate the length of the discoloration column. Of 170 injuries, 16 of them represented closed scars and 154 of them represented open wounds that exposed 4–4355 cm2 of sapwood. The wound length had a strong impact on the length of decay (r = 0.716); however, the spread of discoloration beyond the wound margin was limited (0–20 cm). The most commonly isolated fungus was Sarea difformis (Fr.) Fr. and, among the Basidiomycetes, Peniophora pini (Schleich.) Boidin. The results suggest that when planning to grow P. contorta in areas of Europe, the population size of large game animals needs to be considered, in view of potential risk of bark stripping damage.

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Rossano, Viola, and Giuliano De Stefano. "Computational Evaluation of Shock Wave Interaction with a Cylindrical Water Column." Applied Sciences 11, no. 11 (May 27, 2021): 4934. http://dx.doi.org/10.3390/app11114934.

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Computational fluid dynamics was employed to predict the early stages of the aerodynamic breakup of a cylindrical water column, due to the impact of a traveling plane shock wave. The unsteady Reynolds-averaged Navier–Stokes approach was used to simulate the mean turbulent flow in a virtual shock tube device. The compressible flow governing equations were solved by means of a finite volume-based numerical method, where the volume of fluid technique was employed to track the air–water interface on the fixed numerical mesh. The present computational modeling approach for industrial gas dynamics applications was verified by making a comparison with reference experimental and numerical results for the same flow configuration. The engineering analysis of the shock–column interaction was performed in the shear-stripping regime, where an acceptably accurate prediction of the interface deformation was achieved. Both column flattening and sheet shearing at the column equator were correctly reproduced, along with the water body drift.

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Krzyżanowska, Anna, Eugeniusz Milchert, and Marcin Bartkowiak. "Changes in the composition of wastewater as a result of dehydrochlorination of 1,3-dichloropropan-2-ol under different process conditions." Polish Journal of Chemical Technology 16, no. 1 (March 1, 2014): 92–96. http://dx.doi.org/10.2478/pjct-2014-0016.

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Abstract The results of dehydrochlorination of 1,3-dichloropropan-2-ol to epichlorohydrin are reported. The process ran in the reaction-stripping column system with a continuous removal of epichlorohydrin in a steam stream. The influence of 10 wt% alkali solution (NaOH, Ca(OH)2) and the method of distillate collection on the 1,3-dichloropropan-2-ol conversion, selectivity of transformation to epichlorohydrin and by-products, and the composition of wastewater have been analysed.

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Bruchet, A. "State of the art analytical methods for solving taste and odour episodes." Water Supply 6, no. 3 (July 1, 2006): 157–65. http://dx.doi.org/10.2166/ws.2006.799.

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This paper summarizes the main types of tastes and odors encountered in drinking waters and describes the best analytical tools available to find the origins of these phenomena. The main complementary extraction-concentration techniques based on stripping and liquid-liquid or liquid-solid principles are discussed. Analysis at pg/L levels using a large volume on-column injection method in GC/MS is described. A sensory-GC/MS device is also presented in detail.

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Staudinger, Jeffery, William R. Knocke, and Clifford W. Randall. "Evaluating the Onda Mass Transfer Correlation for the Design of Packed-Column Air Stripping." Journal - American Water Works Association 82, no. 1 (January 1990): 73–79. http://dx.doi.org/10.1002/j.1551-8833.1990.tb06908.x.

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Kamalanathan, Ishara Dedunu, and Peter James Martin. "Competitive adsorption of surfactant–protein mixtures in a continuous stripping mode foam fractionation column." Chemical Engineering Science 146 (June 2016): 291–301. http://dx.doi.org/10.1016/j.ces.2016.03.002.

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Rudik, Irina S., Olesya N. Katasonova, Olga B. Mokhodoeva, Tatyana A. Maryutina, Boris Ya Spivakov, and Igor V. Ilyukhin. "SEPARATION OF P t (IV), P d (II) AND R h (III) FROM CHLORIDE SOLUTIONS BY MULTISTAGE SOLVENT EXTRACTION USING NITROGEN-CONTAINING EXTRACTANTS." Industrial laboratory. Diagnostics of materials 85, no. 4 (May 15, 2019): 5–10. http://dx.doi.org/10.26896/1028-6861-2019-85-4-5-10.

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The possibility of Pd (II), Pt (IV), and Rh (III) separation from chloride solutions by solvent extraction in rotating coiled columns (RCC) is demonstrated. The reagents most frequently used in extraction of platinum metals were selected as extractants: trioctylamine (TOA), methyltrialkylammonium chloride (MTAA), tributylphosphate (TBP), N, N, N',N'-tetra-re-octyldiglyTOlamide (TODGA). The completeness of extraction of the platinum group metals from individual and mixed hydrochloric acidic and chloride solutions was studied depending on the nature and concentration of the extractant, acidity of the test solutions and other factors. Optimal conditions for the quantitative extraction of metals from model hydrochloric acidic and chloride solutions and subsequent selective separation at the stripping stage are specified. A scheme of multistaged extraction separation of Pd (II), Pt (IV), and Rh (III) from chloride solutions using a 0.05 M solution of MTAA in toluene as a stationary phase in RCC is proposed. The scheme includes extraction of Pd (II) and Pt (IV) ions from a chloride solution (0, 1 M HCl + 30 g/liter NT) into the organic phase with simultaneous separation of Rh(III) remaining in the aqueous phase, and sequential stripping of Pd (II) and Pt (IV) from the organic phase with a 0.01 M solution of thiourea in 0.1 M HCl and a 1 M solution of thiourea in 0.5 M HCl, respectively. The scheme was tested in separation of the platinum group metals from the technological solution of a given composition. The degree of metal extraction with a 0.05 M MTAA solution in toluene and sequential stripping with thiourea solutions is 99.5% for Rh (III), 99.9% for Pd (II), and 97.4% for Pt (IV). The separated water fractions of rhodium and platinum after leaving the column did not contain impurities of other platinum metals whereas the water fraction of palladium contained 0.5% Pt.

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Sekararum, Andina Indah, Andhika Sulistyani Putri, and Margono Margono. "Stripping Bioethanol from Fermented Molasses in A Packed Tower." Equilibrium Journal of Chemical Engineering 2, no. 1 (January 10, 2018): 31. http://dx.doi.org/10.20961/equilibrium.v2i1.40431.

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<p>The high price of bioethanol is the barrier of its implementation as renewable energy sources. Therefore, efforts to reduce its price is an important factor to drive the implementation. Stripping is a way to separate bioethanol from the broth which will be cheaper than distillation process. This research was aimed to separate bioethanol from its fermented molasses. The effect of feed flow rate, air flow rate and feed temperature were investigated. A column with inside diameter of 0.1 m was used and packed with 0.02 x 0.016 m PVC rashig ring at 1 m of bed. The broth was fed from the top side and the air stripper was flown down from the bottom side. Six millimeters of the top product was collected at steady state condition for analysis of bioethanol concentration. The best experiment was the one which had feed flow rate 1,5 L/min and stripping air flow rate of 5,85 L/min. It resulted bioethanol content of 19.39% or equivalent to 38.5% stripped out of the broth.</p>

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Rochte, Jacob, and Kris Berglund. "Preliminary Studies on the Use of Reactive Distillation in the Production of Beverage Spirits." Beverages 5, no. 2 (April 2, 2019): 29. http://dx.doi.org/10.3390/beverages5020029.

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Distilled alcoholic beverages have been produced through fermentation and distillation for centuries but have not purposefully involved a chemical reaction to produce a flavoring. Introducing a microorganism to produce butyric acid along with the typical yeast ethanol fermentation sets up a reactive distillation system to flavor a spirit with ethyl butyrate and butyric acid. The ternary interactions of water, ethanol, and butyric acid allow all three to vaporize in the stripping distillation, thus they are concentrated in the low wines and give a large excess of ethanol compared to butyric acid for better reaction completion. The stripping distillation has also been modeled on Aspen Plus® V9 software (by Aspen Technology, Inc. Bedford, MA, USA) and coincides well with a test stripping distillation at the bench scale. Amberlyst® 15 wet catalyst was added to a subsequent distillation, resulting in the production of the desired ethyl butyrate in the distillate, measured by gas chromatography. Primary sensory evaluation has determined that this process has a profound effect on the smell of the spirit with the main flavor being similar to fruity bubble gum. The current results will provide a pathway for creating spirits with a desired flavor on demand without acquiring a heavy capital cost if a beverage distillation column is already purchased.

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Nöthe, T., D. Hartmann, J. von Sonntag, C. von Sonntag, and H. Fahlenkamp. "Elimination of the musk fragrances galaxolide and tonalide from wastewater by ozonation and concomitant stripping." Water Science and Technology 55, no. 12 (June 1, 2007): 287–92. http://dx.doi.org/10.2166/wst.2007.422.

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Ozone reacts with the musk fragrances tonalide and galaxolide with rate constants of 8 M−1 s−1 and 140 M−1 s−1, respectively. In wastewater, ozone eliminates only the more reactive compound, galaxolide, in competition with its reaction with the wastewater matrix. As both compounds are also stripped in a bubble column, tonalide is also eliminated to some extent.

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Kunesh, John G., Thomas P. Ognisty, Michaharu Sakata, and Guang X. Chen. "Sieve Tray Performances for Steam Stripping Toluene from Water in a 4-ft Diameter Column." Industrial & Engineering Chemistry Research 35, no. 8 (January 1996): 2660–71. http://dx.doi.org/10.1021/ie950760w.

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45

Boontawee, Supreeya, and Sirichai Koonaphapdeelert. "In-situ Biomethane Enrichment by Recirculation of Biogas Channel Digester Effluent Using Gas Stripping Column." Energy Procedia 89 (June 2016): 78–84. http://dx.doi.org/10.1016/j.egypro.2016.05.011.

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Zakharov, М. К., and N. V. Lobanov. "INTERNAL ENERGY SAVING IN DISTILLATION COLUMNS WITH REAL PLATES AND IN FILLED DISTILLATION COLUMNS." Fine Chemical Technologies 12, no. 2 (April 28, 2017): 42–49. http://dx.doi.org/10.32362/2410-6593-2017-12-2-42-49.

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Perspective ways of power saving in the distillation of liquid mixtures are considered. The phenomenon of internal energy saving on theoretical plates is considered in detail. As shown in this article, the phenomenon depends on the number of theoretical plates in the rectifying and stripping sections of the column and also on the aggregative state of the feed mixture. The processes of heat and mass transfer on real plates with various values of efficiency factor are considered. Blocks of real plates equivalent to one theoretical stage, that is, blocks where the leaving flows of the liquid and vapor are in equilibrium, are isolated. Analogically, heat and mass transfer in apparatuses with a continuous phase contact having a layer height providing one theoretical plate is considered. It is proved that internal energy saving in filled rectifying columns with real plates also depends on the number of theoretical plates and the aggregative state of the initial mixture.

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AlDhaheri, Zaina, Saniha Aysha Ajish, Sumaita Rahman, Laila Owda, Salma AlNowahi, and Omar Chaalal. "A Novel Global Warming Solution: Use of Flue Gas to Produce Urea." MATEC Web of Conferences 187 (2018): 03003. http://dx.doi.org/10.1051/matecconf/201818703003.

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Urea is a nitrogenous organic compound which is widely used as a fertilizer and in the agricultural industry. On an industrial scale, urea can be manufactured from the reaction of carbon dioxide and ammonia. The goal of this research is to design a plant that produces 46.84 tons/hr of urea from the raw materials carbon dioxide and ammonia. The quantities of carbon dioxide and ammonia consumed in the process were 37.32 tons/hr and 28. 84 tons/hr, respectively. The carbon dioxide is obtained using a sustainable approach from the waste products, the flue gas, of a nearby power plant. In the first step of the process, carbon dioxide is extracted in an absorption column that uses ammonia and stripping columns from the flue gases emitted from a power plant. This ensures that the whole production process is environmentally sustainable and contributes to the reduction of carbon dioxide that cause global warming.

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Mahanwar, K. R., S. R. Sabale, R. B. Kadam, and B. S. Mohite. "Reversed-Phase Column Extractive Separation of Gd(III) with Poly[dibenzo-18-crown-6]." International Journal of Inorganic Chemistry 2012 (April 22, 2012): 1–6. http://dx.doi.org/10.1155/2012/515196.

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A poly[dibenzo-18-crown-6] exhibits good chemical stability, reusability, and faster rate equilibrium for the separation of Gd(III). Both uptake and stripping of metal ions were rapid, indicating a better accessibility of the complexing sites. The proposed method has been applied for chromatographic separation of Gd(III) by using picric acid as medium and poly[dibenzo-18-crown-6] as stationary phase. The influences of picric acid concentration, different eluting agents, and so forth, were discussed and the optimum conditions were established. The breakthrough capacity of poly[dibenzo-18-crown-6] for Gd(III) was 0.572±0.01 mmolg-1 of crown polymer. The proposed method has been applied to sequential chromatographic separation of their binary and multicomponent mixtures. Gd(III) has been determined from real samples with good analytical reliability.

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Jemelková, Zuzana, Jiří Zima, and Jiří Barek. "Voltammetric and amperometric determination of doxorubicin using carbon paste electrodes." Collection of Czechoslovak Chemical Communications 74, no. 10 (2009): 1503–15. http://dx.doi.org/10.1135/cccc2009081.

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Direct current voltammetric (DCV) and differential pulse voltammetric (DPV) determination of antineoplastic agent doxorubicin (DOX) at a carbon paste electrode (CPE) was developed. Britton–Robinson buffer (pH 7.0) was used as a supporting electrolyte. The limits of detection are 8 × 10–7 mol l–1 (DCV) and 6 × 10–8 mol l–1 (DPV). The accumulation of DOX at the electrode surface was used to decrease the limits of detection down to 2.2 × 10–7 mol l–1 for adsorptive stripping DC voltammetry (DCAdSV) and 2.8 × 10–9 mol l–1 for adsorptive stripping differential pulse voltammetry (DPAdSV) at CPE. The results of the voltammetric methods were utilized for the development of a new determination of doxorubicin using HPLC with amperometric detection on CPE based on spherical microparticles of glassy carbon in a wall-jet configuration. A column with chemically bonded C18 stationary phase and a mobile phase containing 0.01 M phosphate buffer (pH 5.0)–methanol 25:75 (v/v) were used. The limit of detection is 4 × 10–7 mol l–1 (HPLC with electrochemical detection (ED)).

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Yang, Chu Fen, Jian Wei Guo, Shi Ying Yang, and Guan Feng Wei. "Process Simulation and Optimization on Phenol Extraction for Coal-Gasification Wastewater." Advanced Materials Research 550-553 (July 2012): 2349–53. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.2349.

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Coal-gasification wastewater is an industrial toxic wastewater with high concentration of phenols. To provide process parameters for industrial practice, simulation and optimization were carried out on the phenol removal process for coal-gasification wastewater which included phenol extraction, solvent distillation and residual solvent stripping. Calculation results showed that the optimized process parameters were as the following. When solvent ratio was 1:6, after four-stage extraction by methyl isobutyl ketone, the concentration of phenols in the wastewater can be reduced to below 200mg/L from 5000mg/L. While in the solvent distillation column, to make the solvent recycling usable and cut down solvent consumption, the column stages was recommended as 15, reflux ratio R as 0.1360, and feed stage as 10. Moreover, to recover the residual solvent in the wastewater, the number of theoretical stages for the stripper was proposed as 5, and distillate rate as 2388kg/hr.

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Journal articles on the topic 'Stripping column'

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