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Статті в журналах з теми "MIBK"

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Автор: Grafiati

Опубліковано: 11 вересня 2023

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1

Saito, Isao, Harumi Oshima, Norihisa Kawamura, and Masuo Yamada. "Screening Method for Determination of High Levels of Cadmium, Lead, and Copper in Foods by Polarized Zeeman Atomic Absorption Spectrometry Using Discrete Nebulization Technique." Journal of AOAC INTERNATIONAL 71, no. 4 (July 1, 1988): 829–32. http://dx.doi.org/10.1093/jaoac/71.4.829.

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Анотація:

Abstract A screening method for determination of cadmium, lead, and copper in foods was developed. The sample (1-3 g) is digested with HN03- H2S04-HCI04 in a centrifuge tube attached to a straight glass tube that prevents loss of HN03 by volatilization. After digestion, potassium iodide, H2S04, and MIBK (4-methyl 2-pentanone) are added, and the metals are extracted with MIBK as metal iodides. The MIBK solution is injected and the metals are determined by flame polarized Zeeman atomic absorption spectrometry using a discrete nebulization technique. Recoveries of metals from fortified milk powder, unpolished rice, fish, beef, peanut butter, apple, and cabbage were satisfactory. The analytical results for NBS Oyster Tissue and NIES Pepperbush, Chlorella, and Mussel agreed with certified or reference values except lead in Pepperbush. The limits of quantitation for cadmium, lead, and copper were 0.01, 0.09, and 0.02 ppm, respectively. This method is simple and safe for routine analysis of high levels of cadmium, lead, and copper in foods.

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2

Hu, Yingjie, Yuxin Mei, Baining Lin, Xuhong Du, Fan Xu, Huasheng Xie, Kang Wang, and Yonghua Zhou. "An active and stable multifunctional catalyst with defective UiO-66 as a support for Pd over the continuous catalytic conversion of acetone and hydrogen." RSC Advances 11, no. 1 (2021): 48–56. http://dx.doi.org/10.1039/d0ra09217g.

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Анотація:

The one-pot synthesis of methyl isobutyl ketone (MIBK) and methyl isobutyl methanol (MIBC) from acetone and hydrogen is a typical cascade reaction comprised of aldol condensation-dehydration-hydrogenation.

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3

Yoon, Jung-Hwan, Yong-Geon Shin, Mary Beth Kirkham, Seok-Soon Jeong, Jong-Geon Lee, Hyuck-Soo Kim, and Jae E. Yang. "A Simplified Method for Anionic Surfactant Analysis in Water Using a New Solvent." Toxics 10, no. 4 (March 29, 2022): 162. http://dx.doi.org/10.3390/toxics10040162.

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Анотація:

Anionic surfactants (AS) are becoming a major emerging contaminant of waters due to their widespread use in household and industrial products. The standard chloroform method for analysis of AS in water relies on chloroform extraction of a methylene blue active substance (MBAS), which contains ion pairs between methylene blue (MB) molecules (positively charged) and AS. Due to the poor extractability of chloroform, the procedure is complicated, time-consuming, and subject to anionic interferences. A mixture of methyl isobutyl ketone (MIBK)–1,2-dichloroethane (DCE) at a 3:1 ratio of MIBK:DCE proved to be a robust solvent for AS extraction for a wide range of samples under various chemical conditions. The objectives of this research were to set the washing protocol to eliminate the anionic interferences in the MIBK-DCE extraction and to develop a new simplified analytical method for AS analysis using the MIBK-DCE (3:1) extractant. The suitability of the proposed MIBK-DCE method was validated based on quality control and assurance criteria, such as selectivity, accuracy, precision, method detection limit (MDL), limit of quantification (LOQ), and sensitivity. Various water samples, such as freshwater, wastewater, and seawater, were used for the method development and validation. Interferences by inorganic and organic anions were evident in the reference chloroform method but were eliminated in the MIBK-DCE procedure with a two-step process that consisted of washing with a carbonate/bicarbonate solution at pH 9.2 and a mixture of silver sulfate (Ag2SO4) and potassium alum (AlK(SO4)2). The simplified MIBK-DCE method for sodium dodecyl sulfate (SDS) analysis consisted of (i) sample pre-treatment, (ii) MIBK-DCE extraction, (iii) washing and filtration, and (iv) absorbance measurement. The MIBK-DCE method was accurate, precise, selective, and sensitive for AS analysis and showed MDL of 0.0001 mg/L, LOQ of 0.0005 mg/L, relative standard deviation (RSD) of 0.1%, and recovery of 99.0%. All these criteria were superior to those of the chloroform method. Sensitivity analysis showed highly significant correlations in AS analyses between the MIBK-DCE and chloroform methods for domestic wastewater, industrial wastewater, and seawater. The MIBK-DCE method is simple, rapid, robust, reproducible, and convenient, when compared to the chloroform method. Results demonstrate that the simplified MIBK-DCE method can be employed for AS analysis in a wide range of environmental waters including seawater.

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4

Al-Rabiah, Abdulrahman A., Raed R. Alkathiri, and Abdulaziz A. Bagabas. "Process Development for Methyl Isobutyl Ketone Production Using the Low-Pressure One-Step Gas-Phase Selective Hydrogenation of Acetone." Processes 10, no. 10 (October 2, 2022): 1992. http://dx.doi.org/10.3390/pr10101992.

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Анотація:

Methyl isobutyl ketone (MIBK) is a highly valuable product in the chemical industry. It is widely used as an extracting agent for heavy metals, antibiotics, and lubricating oils. Generally, MIBK can be produced by three-step and one-step liquid-phase methods. These methods are expensive and energy-demanding due to the high pressure and low conversion of acetone. A novel nano-Pd/nano-ZnCr2O4 catalyst was developed to produce MIBK with high conversion and selectivity of 77.3% and 72.1%, respectively, at 350 °C and ambient pressure, eliminating the need for high pressure in conventional MIBK processes. This study is the first that proposes a newly developed process of methyl isobutyl ketone (MIBK) production using the low-pressure one-step gas-phase selective hydrogenation of acetone. In this work, a novel process flow diagram has been developed for the production of MIBK using the developed nano-catalyst. The process was heat integrated, resulting in a 26% and a 19.5% reduction in the heating and cooling utilities, respectively, leading to a 12.6% reduction in the total energy demand. An economic analysis was performed to determine the economic feasibility of the developed process, which shows that the process is highly profitable, in which it reduced both the capital and operating costs of MIBK synthesis and showed a return on investment (ROI) of 29.6% with a payback period of 2.2 years. It was found that the ROI could be increased by 18% when the reactor temperature is increased to 350 °C. In addition, the economic sensitivity analysis showed that the process is highly sensitive to product prices and least sensitive to utility prices, which is due to the versatility of the process that requires only a low amount of energy.

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5

Du, Chang Hai, Zhuo Min Yang, Guo Bin Zhao, and Li Jie Zhu. "One-Step Synthesis of Methyl Isobutyl Ketone from Acetone Catalysed by Ni-Zirconia." Advanced Materials Research 391-392 (December 2011): 908–11. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.908.

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Анотація:

The one-step synthesis of methyl isobutyl ketone from acetone (MIBK) and H2 in liquid phase was studied over Ni-zirconia catalyst prepared by precipitation. The performances of Ni/ZrO2 catalysts were evaluated by the conversion of acetone and the selectivity of MIBK. The effect of different preparation conditions such as aging temperature, calcination temperature, nickel content and reduction temperature was investigated. The results showed that high acetone conversions of up to 33% and MIBK selectivities of up to 85% were recorded at a nickel content of 13.0 wt % and the reduction temperature of 400°C.

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6

Zelinková, Hana, Rostislav Červenka, and Josef Komárek. "Stabilizing Agents for Calibration in the Determination of Mercury Using Solid Sampling Electrothermal Atomic Absorption Spectrometry." Scientific World Journal 2012 (2012): 1–7. http://dx.doi.org/10.1100/2012/439875.

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Анотація:

Tetramethylene dithiocarbamate (TMDTC), diethyldithiocarbamate (DEDTC), and thiourea were investigated as stabilizing agents for calibration purposes in the determination of mercury using solid sampling electrothermal atomic absorption spectrometry (SS-ETAAS). These agents were used for complexation of mercury in calibration solutions and its thermal stabilization in a solid sampling platform. The calibration solutions had the form of methyl isobutyl ketone (MIBK) extracts or MIBK-methanol solutions with the TMDTC and DEDTC chelates and aqueous solutions with thiourea complexes. The best results were obtained for MIBK-methanol solutions in the presence of2.5 g L-1TMDTC. The surface of graphite platforms for solid sampling was modified with palladium or rhenium by using electrodeposition from a drop of solutions. The Re modifier is preferable due to a higher lifetime of platform coating. A new SS-ETAAS procedure using the direct sampling of solid samples into a platform with an Re modified graphite surface and the calibration against MIBK-methanol solutions in the presence of TMDTC is proposed for the determination of mercury content in solid environmental samples, such as soil and plants.

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7

Das, Nigamananda. "Progress in One-Pot Synthesis of Methyl Isobutyl Ketone Using Multifunctional Layered Based Catalysts." Key Engineering Materials 571 (July 2013): 169–96. http://dx.doi.org/10.4028/www.scientific.net/kem.571.169.

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Анотація:

Methyl isobutyl ketone (MIBK) is one of the most widely produced and used aliphatic ketones worldwide. The one-step MIBK process with no intermediate separation steps using multifunctional catalysts is an important development towards greener organic synthesis and generates tremendous interest among the researcher across the globe. The single step process is facile and more economically viable and has provided opportunity to develop new and improved catalyst systems capable of operating under mild conditions. A widely variety of catalytic systems have been used in one-step process during last three to four decades. The progress in one-pot synthesis of MIBK using different multifunctional catalysts with special reference to layered based catalysts was critically reviewed in this article.

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8

Vézina, Manon, Adriane B. Kobusch, Patrick du Souich, Erminio Greselin, and Gabriel L. Plaa. "Potentiation of chloroform-induced hepatotoxicity by methyl isobutyl ketone and two metabolites." Canadian Journal of Physiology and Pharmacology 68, no. 8 (August 1, 1990): 1055–61. http://dx.doi.org/10.1139/y90-159.

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Анотація:

The hepatonecrogenic properties of chloroform (CHCl3) can be modified by the administration of various chemicals. The ability of methyl isobutyl ketone (MIBK) and its two major metabolites, 4-methyl-2-pentanol (4MPOL) and 4-hydroxymethyl isobutyl ketone (4-OHMIBK) to potentiate the liver injury induced by CHCl3 was assessed in rats. The parent compound and both metabolites significantly increased the liver damage induced by CHCl3, as demonstrated by the elevation of the plasma activity of two transferases alanine aminotransferase and ornithine carbamoyl transferase and by the severity of the morphological changes. Moreover, the minimally effective dosage needed to potentiate CHCl3-induced hepatotoxicity was approximately 5 mmol/kg for the three compounds. We also studied the inducing properties of MIBK (cytochrome P-450 liver content and the activity of aniline hydroxylase, 7-ethoxycoumarin O-deethylase, and aminopyrine N-demethylase). Cytochrome P-450 content and the oxidation of aniline and 7-ethoxycoumarin were significantly increased with either a single (7.5 mmol/kg or greater) or a multiple (5.0 and 7.5 mmol∙kg−1∙day−1 for 5 days) administration of MIBK. An increase in the activity of the aminopyrine demethylase was also elicited by the repetitive administration of MIBK. With gel electrophoresis, we found that MIBK significantly increased the 52.1- and 54.1-kDa proteins, corresponding most probably to P-450 isozymes.Key words: methyl isobutyl ketone, methyl isobutyl ketone metabolites, CHCl3 hepatotoxicity, potentiation, enzyme induction.

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9

Mihajlovic, Randjel, Natasa Ignjatovic, Marija Todorovic, Ivanka Holclajtner-Antunovic, and Vesna Kaljevic. "Spectrophotometric determination of phosphorus in coal and coal ash using bismuth-phosphomobybdate complex." Journal of the Serbian Chemical Society 68, no. 1 (2003): 65–73. http://dx.doi.org/10.2298/jsc0301065m.

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Анотація:

A modified spectrophotometric method using the bismuth phosphomolybdate complex for the determination of phosphorus in coal and coal ash is suggested. Bismuth together with phosphate and molybdate forms a very stable complex in acid medium which turns blue ("molibdenum blue") by reduction with ascorbic acid. The apparent molar absorptivity of PBiMo is 1.66x104 dm3 mol-1cm-1 at 720 nm and 2.10x104 dm3 mol-1cm-1 at 670 nm isobutyl methyl ketone (MIBK). Interference caused by the ions present are within the tolerance limits (?2 %). Beer?s law is obeyed in the for concentration range to 0.6 ?g/mL (aqueous solution) and to 1.2 ?g/mL P (MIBK). The sensitivity of the proposed method is 0.0078 ?g/mL (aqueous solution) and 0.0066 ?g/mL (MIBK).

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10

Rivas, Sandra, Carlos Vila, Valentín Santos, and Juan Carlos Parajó. "Furfural production from birch hemicelluloses by two-step processing: a potential technology for biorefineries." Holzforschung 70, no. 10 (October 1, 2016): 901–10. http://dx.doi.org/10.1515/hf-2015-0255.

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Abstract Birch samples were subjected to non-isothermal autohydrolysis to obtain a solution of hemicellulosic saccharides and a solid phase mainly made up of cellulose and lignin. Based on kinetic modeling, operational conditions were identified which give rise to soluble saccharides and furfural derived from xylan in a yield of 80.5%. The soluble mixture was supplemented with 1% sulfuric acid and heated (directly or in the presence of methyl isobutyl ketone, MIBK) for furfural production. MIBK is used as an extraction agent to limit furfural consumption by side reactions. Operating in single phase at 170°C, up to 44.8% of the potential substrates were converted into furfural. In experiments performed in biphasic media, the effects of MIBK were assessed by empirical modeling and about 75% of the potential substrates were converted under selected conditions.

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11

Santoso, Imam, Tritiyatma H. N, and Ana Titian. "EKSTRAKSI EMAS DARI LIMBAH PAPAN SIRKUIT TELEPON GENGGAM MENGGUNAKAN TEKNIK MEMBRAN CAIR EMULSI." JRSKT - Jurnal Riset Sains dan Kimia Terapan 1, no. 2 (December 31, 2011): 111. http://dx.doi.org/10.21009/jrskt.012.06.

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Анотація:

Penelitian ini bertujuan untuk menentukan persen ekstraksi emas dari limbah papan sirkuit telepon genggam dengan teknik membran cair emulsi menggunakan MIBK sebagai carrier. Reaksinya terjadi secara simultan di permukaan membran, antara senyawa yang akan dipisahkan pada fasa umpan dengan senyawa pembawa pada fasa organik. Logam emas hasil reaksi akan terdifusi ke fasa membran yang pada akhirnya hasil ekstraksi terkumpul dan terkonsentrasi di fasa penerima. Sebelum diaplikasikan ke limbah telepon , terlebih dahulu dipelajari beberapa parameter yang berpengaruh terhadap perolehan persen ekstraksi. Pada penelitian ini kondisi optimum untuk parameter pembuatan fasa emulsi yaitu 1:1, pengaruh kecepatan pembuatan emulsi pada yaitu 1000 rpm. Pengaruh konsentrasi carrier terhadap persen ekstraksi emas dengan konsentrasi MIBK sebesar 3%, pengaruh kecepatan kontak terhadap persen ekstraksi emas adalah pada 1000 rpm. Penerapan kondisi optimum pada limbah papan sirkuit telepon genggam memberikan persen ekstraksi Au sebesar83,24%. Kata kunci: limbah papan sirkuit telepon genggam, MIBK, teknik membran cair emulsi.

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12

Inci, I., Y. S. Asçi, and A. F. Tuyun. "Reactive Extraction of L (+) Tartaric Acid by Amberlite LA-2 in Different Solvents." E-Journal of Chemistry 8, s1 (2011): S509—S515. http://dx.doi.org/10.1155/2011/167945.

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Анотація:

The extraction of L(+) tartaric acid from aqueous solutions by amberlite LA-2 is a secondary amine mixture in different diluent solvents. Extraction equilibria of L(+) tartaric acid by amberlite LA-2 in 1-octanol, cyclohexane, isooctane, hexane, methyl isobutyl ketone (MIBK) solvents at temperature 298.15 K have been measured. The batch extraction experiments distribution coefficients (D), loading factors (Z) and extraction efficiency (E) were calculated. The maximum removal of L(+) tartaric acid is 91 % with MIBK and 0.92 mol.L-1initial concentration of Amberlite LA-2.

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13

Yoon, Jung-Hwan, Yong Geon Shin, Hyuck Soo Kim, M. B. Kirkham, and Jae E. Yang. "Screening of a Novel Solvent for Optimum Extraction of Anionic Surfactants in Water." Toxics 10, no. 2 (February 8, 2022): 80. http://dx.doi.org/10.3390/toxics10020080.

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Анотація:

Anionic surfactants (AS) are detrimental aquatic pollutants due to their well-characterized toxicity to aquatic organisms. The concentration of AS in aquatic environments is increasing because of their extensive use in many industries and households. The standard reference method for AS analysis is to determine a methylene blue active substance (MBAS) complex formed between AS and the methylene blue (MB) cation by using chloroform. However, chloroform has a low AS extraction efficiency and other limiting properties, such as a high density and volatility, which make the conventional AS analytical method time-consuming and labor-intensive. In an effort to replace the use of chloroform, this study was carried out to screen novel solvents for their ability to extract AS in water samples. Criteria were based on AS extraction efficiency, physicochemical properties, and the stability of the solvent under different environmental conditions. Organic solvents, such as methyl isobutyl ketone (MIBK), 1,2-dichloroethane (DCE), dichloromethane, benzene, and n-hexane, were assessed. In extraction of the anionic surfactant sodium dodecyl sulfate (SDS), the mixture of MIBK-DCE (3:1) proved to be an optimum solvent as an alternative to chloroform. It not only enhanced SDS extractability but also improved properties, such as having a lower volatility, a lower density than water, and a quicker phase separation. Among solvents screened, no one single solvent in SDS extraction could meet such criteria. The performance of the MIBK-DCE (3:1) mixture in SDS extraction was stable, irrespective of pH and ionic strength of the SDS solution, washing process, and presence of cations. Anionic interference from halogen and polyatomic and organic anions in SDS extraction by MIBK-DCE (3:1) existed only at an elevated concentration, which is not occurring in the natural aquatic environment. Results demonstrated that a MIBK-DCE (3:1) mixture solvent could be used in AS analysis for a wide range of aquatic samples and it could be the basis for the development of a new analytical method to replace conventional chloroform.

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14

Di Marino, Davide, Vadim Aniko, Antonio Stocco, Stefanie Kriescher, and Matthias Wessling. "Emulsion electro-oxidation of kraft lignin." Green Chemistry 19, no. 20 (2017): 4778–84. http://dx.doi.org/10.1039/c7gc02115a.

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15

Shu, Feifei, Shaoai Xie, and Jinping Jia. "Determination of lead(II) by online novel electrolyte dropping electrode using 1,10-phenanthroline in flow injection system." Collection of Czechoslovak Chemical Communications 76, no. 2 (2011): 115–29. http://dx.doi.org/10.1135/cccc2010088.

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Анотація:

The transfer of Pb(II) facilitated by 1,10-phenanthroline (phen) presented in the methyl isobutyl ketone (MIBK) across the polarized water|MIBK interface was systematically investigated by novel electrolyte dropping electrode using cyclic voltammetry and square wave voltammetry. The protonation of 1,10-phenanthroline in polarized water|MIBK interface was explored. The dependence of the half-wave potential on PbCl2 and phen concentration was investigated and the stoichiometry of resulting metal ligand complex was formulated. Different concentrations of PbCl2 was determined online and the transfer peak current was proportional to the bulk concentration of the Pb2+ varied between 8 μM to 0.5 mM and 0.5 to 1 mM, and the linear regression coefficients were 0.9953 and 0.9995, respectively. The standard deviations (RSD) were 4.33, 5.80, 4.13, 3.88, 2.23, 3.39, 1.38, 2.42, 2.00, 2.73 and 2.37% for 8 times successive determinations of Pb2+ for the concentrations of 0.008, 0.05, 0.1, 0.2, 0.3, 0.35, 0.4, 0.5, 0.8, 0.9 and 1 mM, respectively. The long time stability of the electrolyte dropping electrode was tested and the result showed that this novel method was simple, rapid and efficient.

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16

Li, Xiao, and Yun Ren Qiu. "Vapor-Liquid Equilibrium for Binary Systems of Methyl Ethyl Ketone and Methyl Isobutyl Ketone." Advanced Materials Research 550-553 (July 2012): 2616–20. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.2616.

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Анотація:

Atmospheric vapor-liquid equilibrium data of methyl ethyl ketone (MEK) - methyl isobutyl ketone (MIBK) were measured using an improved Rose still and were used to recover the parameters of NRTL and UNIQUAC models. The results show that the simulated results agree well with the experimental data. The mean temperature variation is 0.14 °C and the mean mole fraction variation is 0.0023 using UNIQUAC model while the mean temperature variation is 0.17 °C and the mean mole fraction variation is 0.0025 using NRTL model. Both models can be used to calculate the atmospheric vapor-liquid equilibrium data of MEK - MIBK.

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17

Shu, Feifei, Shaoai Xie, and Jinping Jia. "Electrochemical determination of cadmium(II) using dithizone assisted ion transfer and eletrolyte dropping electrode." Collection of Czechoslovak Chemical Communications 76, no. 10 (2011): 1177–86. http://dx.doi.org/10.1135/cccc2011066.

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Анотація:

The transfer of Cd(II) assisted by dithizone (DzH2) present in methyl isobutyl ketone (MIBK) at water–MIBK interface was systematically investigated by novel electrolyte dropping electrode (EDE) using cyclic voltammetry (CV) and square wave voltammetry (SWV). The protonation of DzH2 at polarized liquid–liquid interface was studied. The stoichiometry of resulting metal ligand complex was formulated. Transfer peak current was proportional to the bulk concentration of the Cd(II) varied between 1 μM to 0.1 mM and the maximum value of relative standard deviation was about 3.17%. The presented procedure was successfully applied for determination of Cd(II) in real samples.

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18

Jose, Jerin, and Ligy Philip. "Effect of various electrolytes and other wastewater constituents on the degradation of volatile organic compounds in aqueous solution by pulsed power plasma technology." Environmental Science: Water Research & Technology 6, no. 8 (2020): 2209–22. http://dx.doi.org/10.1039/d0ew00388c.

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19

Li, Qing-gang, Kang-gen Zhou, and Qi-xiu Zhang. "MIBK removal from aqueous solution by aeration method." Journal of Central South University of Technology 7, no. 4 (December 2000): 182–85. http://dx.doi.org/10.1007/s11771-000-0049-1.

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20

Klamrassamee, Thepparat, Tana Tana, Navadol Laosiripojana, Lalehvash Moghaddam, Zhanying Zhang, Jorge Rencoret, Ana Gutierrez, José C. del Rio, and William O. S. Doherty. "Effects of an alkali-acid purification process on the characteristics of eucalyptus lignin fractionated from a MIBK-based organosolv process." RSC Advances 6, no. 95 (2016): 92638–47. http://dx.doi.org/10.1039/c6ra20081h.

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Анотація:

In this study, the effects of an alkali-acid purification process on the properties of eucalyptus lignin isolated from a methyl isobutyl ketone (MIBK)/methanol/water-based organosolv fractionation process were evaluated.

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21

Ikatsu, H., T. Nakajima, N. Murayama, and T. Korenaga. "Flow-Injection Analysis for Malondialdehyde in Plasma with the Thiobarbituric Acid Reaction." Clinical Chemistry 38, no. 10 (October 1, 1992): 2061–65. http://dx.doi.org/10.1093/clinchem/38.10.2061.

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Анотація:

Abstract A simple, precise, and rapid method to measure plasma malondialdehyde (MDA) was developed by use of solvent extraction--flow-injection analysis. The reagent solution, containing thiobarbituric acid (TBA), 5 g/L in 100 mL/L phosphoric acid, and extraction solvent (methylisobutyl ketone, MIBK) were propelled with a double-plunger micropump at a flow rate of 0.3 mL/min, and 20 microL of sample was introduced into the reagent stream. After TBA-MDA reactant was extracted into MIBK, the organic phase was continuously separated by a successive phase-separation system equipped with two phase separators, and the absorbance of the TBA-MDA reactant was measured at 532 nm. This approach resulted in excellent sensitivity, a CV of < 1.5%, a good correlation with the conventional manual method, and a sampling frequency of 7 samples/h, suggesting that this semiautomated method is suitable for measuring plasma MDA.

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22

Zuo, Miao, Zheng Li, Yetao Jiang, Xing Tang, Xianhai Zeng, Yong Sun, and Lu Lin. "Green catalytic conversion of bio-based sugars to 5-chloromethyl furfural in deep eutectic solvent, catalyzed by metal chlorides." RSC Advances 6, no. 32 (2016): 27004–7. http://dx.doi.org/10.1039/c6ra00267f.

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Анотація:

5-Chloromethylfurfural (5-CMF) was effectively prepared from fructose and other carbohydrates in a biphasic reaction system, which was composed of methyl isobutyl ketone (MIBK) and deep eutectic solvent (DES) with catalyst of AlCl₃·6H₂O.

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23

Mehdi Irannajad, Zahra Afzali, and Hossein Kamran Haghighi. "Solvent Extraction of Copper Using TBP, D2EHPA and MIBK." Russian Journal of Non-Ferrous Metals 59, no. 6 (November 2018): 605–11. http://dx.doi.org/10.3103/s1067821218060068.

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24

Das, J. K., S. K. Dash, S. Acharya, and B. B. Swain. "Dipolar Association in Binary System: MIBK in Carboxylic Acids." Japanese Journal of Applied Physics 35, Part 1, No. 8 (August 15, 1996): 4531–34. http://dx.doi.org/10.1143/jjap.35.4531.

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25

Hwang, J. David, and Wen-Jwu Wang. "Determination of Hexavalent Chromium in Environmental Fly Ash Samples by an Inductively Coupled Plasma-Atomic Emission Spectrometer with Ammonium Ion Complexation." Applied Spectroscopy 48, no. 9 (September 1994): 1111–17. http://dx.doi.org/10.1366/0003702944029523.

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A method to determine hexavalent chromium in environmental solid waste has been developed by using an ammonium complexation technique in ICP-AES. This method consists of a two-step extraction and the complexation of ammonium ion. An ammonium hydroxide solution was used to extract the chromium(VI) out of the fly ash sample into the solution. Interfering metal ions, such as Pb, Fe, and Zn in the fly ash sample, were effectively removed by extracting them as diethyldithiocarbamate (DDTC) complexes at pH 9.5 into an MIBK (methyl isobutyl ketone) solution. The pH of the aqueous phase of the sample is then transferred and adjusted to 6.0, and the Cr(VI) is extracted as its complex with MIBK prior to the organic ICP analysis. A method detection limit of 50 ng/g or better, as well as spike recoveries of 90 to 110% (at a spike concentration level of 500 ng/g), is obtained when this method is applied to determine chromium(VI) in fly ash samples.

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26

Turkowska, Magdalena, Krzysztof Karoń, Andrzej Milewski, and Agata Jakóbik-Kolon. "Solvent-Impregnated Sorbents for Tantalum from Niobium Separation Using a Fixed-Bed Column." Materials 15, no. 4 (February 17, 2022): 1513. http://dx.doi.org/10.3390/ma15041513.

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Reactor-grade niobium steel is used as a construction material for nuclear reactors. In this case, the presence of tantalum, which is characterized by a 20 times higher active cross section for capturing thermal neutrons than the cross section of niobium (181Ta: 21.3 barn), cannot exceed 100 ppm. Analytical methods for quality and new separation method development control need very pure niobium matrices—niobium compounds with a low tantalum content, which are crucial for preparing matrix reference solutions or certified reference materials (CRMs). Therefore, in this paper, a new, efficient method for separating trace amounts of Ta(V) from Nb(V) using extraction chromatography with the use of sorbents impregnated with methyl isobutyl ketone MIBK solvent is proposed. Various types of MIBK-impregnated sorbents were used (AG® 1-X8 Anion Exchange Resin, AMBERLITE™ IRC120 Na Ion Exchange Resin, SERVACEL® Cellulose Anion Exchangers DEAE 52, active carbons of various grain size, carbonized blackcurrant pomace, carbonized chokeberry pomace, bentonite, and polyurethane foam in lumps). The highest tantalum removal efficiency was determined using active coal-based materials (>97%). The separation effectivity of tantalum from niobium was also determined in dynamic studies using a fixed-bed column with MIBK-impregnated active carbon. Solutions of various Nb:Ta weight ratios (1:1, 100:1, 1000:1) were used. The most impressive result was obtaining 70 mL of high purity niobium solution of tantalum content 0.027 ppm (in relation to Nb) with 88.4% yield of niobium from a solution of Nb:Ta, weight ratio 1000:1 (purge factor equaled 35,000). It proves the presented system to be applicable for preparation of pure niobium compounds with very low contents of tantalum.

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27

Toure, Moussa, Guilhem Arrachart, Jean Duhamet, and Stephane Pellet-Rostaing. "Tantalum and Niobium Selective Extraction by Alkyl-Acetophenone." Metals 8, no. 9 (August 21, 2018): 654. http://dx.doi.org/10.3390/met8090654.

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A study has been carried out on Ta and Nb recovery by a liquid-liquid extraction process using 4-methylacetophenone (4-MAcPh) as the organic phase. The 4-MAcPh was compared to methyl isobutyl ketone (MIBK) with respect to extraction efficiencies (D values) at different concentrations of H2SO4 in the aqueous phase. The results showed a similar extraction of Nb for both solvents. However, for Ta, extraction efficiency is increased by a factor of 1.3 for 4-MAcPh. In addition, the MIBK solubilized completely after 6 mol∙L−1 of H2SO4 against only a loss of 0.14–4% for 4-MAcPh between 6 and 9 mol∙L−1 of H2SO4. The potential of 4-MAcPh has also been studied to selectively recover Ta from a model capacitor waste solution. The results showed a selectivity for Ta in the presence of impurities such as Ag, Fe, Ni and Mn. The 4-MAcPh also presents the advantage of having physicochemical properties adapted to its use in liquid-liquid extraction technologies such as mixer-settlers.

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28

Di Cosimo, J. I., G. Torres, and C. R. Apesteguı́a. "One-Step MIBK Synthesis: A New Process from 2-Propanol." Journal of Catalysis 208, no. 1 (May 2002): 114–23. http://dx.doi.org/10.1006/jcat.2002.3551.

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29

Rodrigues, Alexandre Carlos Camacho, and José Luiz Fontes Monteiro. "Direct synthesis of MIBK from acetone over Pd/NaX catalysts." Applied Catalysis A: General 362, no. 1-2 (June 2009): 185–92. http://dx.doi.org/10.1016/j.apcata.2009.04.041.

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30

Khongchamnan, Punjarat, Nopparat Suriyachai, Torpong Kreetachat, and Saksit Imman. "Characterization of Eucalyptus Lignin Fractionation from a MIBK-Based Solvothermal Process." Trends in Sciences 19, no. 5 (February 25, 2022): 2894. http://dx.doi.org/10.48048/tis.2022.2894.

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In this study, the effects of sulfuric acid on cellulose yield, lignin removal, and lignin recovery in solvothermal fractionation of eucalyptus (EC) were studied. An acid concentration of 0.04 M sulfuric acid (H2SO4), temperature of 180 °C and residence time of 30 min resulted in maximum lignin removal from the solid phase, at 87.7 %. Lignin recovery in the organic phase under optimum conditions was 84.6 %. It should be noted that H2SO4 was the best catalyst in the optimal solvothermal process, and it increased the cellulose yield to 95.2 % in the solid phase. Additionally, the physicochemical and structural properties of the extracted lignin were analyzed using FTIR, TGA, elemental analysis, GPC, and Py-GCMS methods. Thermal degradation analysis showed that recovered lignin is primarily composed of syringyl, guaiacyl and p-hydroxyphenyl units cross-linked by C–C, inter-unit α-O-4, β-O-4 linkages. The weight average molecular weight (Mw) analysis of recovered lignin demonstrated a low molecular weight for recovered lignin (2.19 g/mol). However, the main phenolic derivatives in the extracted lignin obtained from EC were S-units (i.e., syringol, 4-methylsyringol, 4-vinylsyringol). In addition, G-units (4-vinylguaiacol, 4-methylguaiacol, phenol, 2-methylphenol, and 4-methylphenol) were obtained after release from H-units. Py-GCMS analysis showed the predominance of G-units (32.8 %) over S-units (57.4 %). This work demonstrated the potential of fractionated lignin in the production of valuable chemicals in biorefineries. HIGHLIGHTS Eucalyptus was fractionated with solvothermal process with different conditions The maximum lignin removal of 87.7 % was achieved in the presence of catalyst of 0.04 M Organosolv fractionation enabled an extensive and selective delignification The structural changes of lignin were characterized comprehensively GRAPHICAL ABSTRACT

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31

Yang, Xiuli, Xiaohui Wang, Chang Wei, Shili Zheng, Qing Sun, and Dong Wang. "Extraction kinetics of tantalum by MIBK from pulp using Lewis cell." Hydrometallurgy 131-132 (January 2013): 34–39. http://dx.doi.org/10.1016/j.hydromet.2012.10.008.

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32

Iregren, A., M. Tesarz, and E. Wigaeushjelm. "Human Experimental MIBK Exposure: Effects on Heart Rate, Performance, and Symptoms." Environmental Research 63, no. 1 (October 1993): 101–8. http://dx.doi.org/10.1006/enrs.1993.1132.

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33

Kehoe, Daniel F., Darryl M. Sullivan, and Randall L. Smith. "Determination of Gold in Animal Tissue by Graphite Furnace Atomic Absorption Spectrophotometry." Journal of AOAC INTERNATIONAL 71, no. 6 (November 1, 1988): 1153–55. http://dx.doi.org/10.1093/jaoac/71.6.1153.

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Abstract Historically, compounds that contain gold have been used to treat conditions such as rheumatoid arthritis in humans. However, understanding of the metabolic fate of gold in biological tissues has been limited by lack of sensitive quantitative methods of analysis. We addressed this problem by developing a graphite furnace atomic absorption (GFAA) spectrophotometric method to measure trace amounts of gold. This method was validated on small samples of beef liver, kidney, and bone. The samples were digested in micro-Kjeldahl flasks with a mixture of sulfuric, perchloric, and nitric acids; the residue was treated with aqua regia and extracted into methylisobutyl ketone (MIBK); levels of gold were then measured by GFAA. All the reagents were of an ultra-pure grade and were monitored for gold content. We established that the linear range of quantitation was from 1 to 2500 ppb. Multiple extractions with MIBK were not necessary to recover all the gold, and, in most cases, use of ultra-pure acids was not necessary. A scan of the extracts by inductively coupled argon plasma atomic emission spectrophotometry revealed no appreciable concentration of elements that would be most likely to interfere with the determination of gold. Average recoveries of gold ranged from 102 to 111%, and the overall coefficient of variation was 5.5%

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34

Srinivas, S. S. J., B. Tulasi Koteswari Bai, K. Babu Rao, K. Narendra, and M. Sarath Babu. "Studies of Densities, Viscosities and Ultrasonic Speeds of Binary Mixtures Containing Isopropyl Alcohol and Ketones at Different Temperatures." International Letters of Chemistry, Physics and Astronomy 15 (September 2013): 151–58. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.15.151.

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The densities, viscosities and ultrasonic velocities of binary liquid mixtures of Isopropyl alcohol with acetophenone and methyl isobutyl ketone (MIBK) have been measured at temperatures 298.15 and 308.15 K over the entire range of mole fraction. From these data, acoustical parameters such as adiabatic compressibility (β), free volume (Vf) and free length (Lf) have been estimated using the standard relations. The results are interpreted in terms of molecular interactions present in the mixtures.

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35

Srinivas, S. S. J., B. Tulasi Koteswari Bai, K. Babu Rao, K. Narendra, and M. Sarath Babu. "Studies of Densities, Viscosities and Ultrasonic Speeds of Binary Mixtures Containing Isopropyl Alcohol and Ketones at Different Temperatures." International Letters of Chemistry, Physics and Astronomy 15 (June 29, 2013): 151–58. http://dx.doi.org/10.56431/p-l9y27o.

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Анотація:

The densities, viscosities and ultrasonic velocities of binary liquid mixtures of Isopropyl alcohol with acetophenone and methyl isobutyl ketone (MIBK) have been measured at temperatures 298.15 and 308.15 K over the entire range of mole fraction. From these data, acoustical parameters such as adiabatic compressibility (β), free volume (Vf) and free length (Lf) have been estimated using the standard relations. The results are interpreted in terms of molecular interactions present in the mixtures.

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36

Zhang, Qilin, Haichao Li, Zongwei Guo, and Feng Xu. "High Purity and Low Molecular Weight Lignin Nano-Particles Extracted from Acid-Assisted MIBK Pretreatment." Polymers 12, no. 2 (February 8, 2020): 378. http://dx.doi.org/10.3390/polym12020378.

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A simple and economical biorefinery method, organosolv methyl isobutyl ketone (MIBK) pretreatment assisted by Lewis acid ferric trichloride hydrolysis, was proposed for fractionating the lignin from extractive-free Eucalyptus powder at the nanoscale, accompanied by another product furfural, derived from hemicellulose. Under the conditions (180 °C, 1 h) optimized based on the best yield of furfural, 40.13% of the acid-insoluble lignin (AIL) could be obtained with a high purity of 100%, a low molecular weight of 767 (Mn) and improved thermostability. The extracted lignin was characterized by its chemical structure, thermostability, homogeneity, molecular weight, and morphology as compared with milled wood lignin (MWL). The results showed significant variations in chemical structures of the extracted lignin during the pretreatment. Specifically, the aryl ether linkage and phenylcoumarans were broken severely while the resinols were more resistant. The G-type lignin was more sensitive to degradation than the S-type, and after the pretreatment, H-type lignin was formed, indicating the occurrence of a demethoxylation reaction at high temperature. Moreover, the lignin nano-particles were identified visually by AFM and TEM images. The dynamic light scattering (DLS) showed that the average diameter of the measured samples was 131.8 nm, with the polydispersity index (PDI) of 0.149. The MIBK-lignin nano-particles prepared in our laboratory exhibit high potentials in producing high functional and valuable materials for the application in wide fields.

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37

Lee, Joo-Yeon, Trieu-Vuong Dinh, Dong-June Kim, In-Young Choi, Ji-Won Ahn, Shin-Young Park, Yoo-Jin Jung, and Jo-Chun Kim. "Comparison of Water Pretreatment Devices for the Measurement of Polar Odorous Compounds." Applied Sciences 9, no. 19 (September 27, 2019): 4045. http://dx.doi.org/10.3390/app9194045.

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A major problem of measuring polar compounds in the air is water vapor. Therefore, it is important to use a water pretreatment device prior to sampling and analysis. However, many studies have reported the occurrence of many problems following the application of an existing water pretreatment device. Accordingly, the performance of a Desolvator-K that was developed by the authors and two commercial coolers were investigated and compared in this study. Water vapor removal efficiency, recovery rate, and reproducibility of polar odorous compounds (i.e., methyl ethyl ketone (MEK), isobutyl alcohol (i-BuAl), methyl isobutyl ketone (MIBK), butyl acetate (BuAc), styrene) in air were taken into account. It was found that the Desolvator-K, the Cooler-G, and the Cooler-K showed 91.6%, 67.2%, and 62.1% water vapor removal efficiency, respectively, at the relative humidity of 90%. In terms of recovery rate, after water vapor removal devices, the Desolvator-K, the Cooler-G, and the Cooler-K revealed average recoveries of 96.6–103%, 81–101%, and 88.6–100%, respectively. Reproducibility of odorous compounds under all conditions of the Desolvator-K, the Cooler-G, and the Cooler-K were 5.94%, 31.2%, and 8.14% of relative standard deviation (RSD), respectively. Therefore, it is suggested that the Desolvator-K should be established as a water pretreatment device for the MEK, i-BuAl, MIBK, and BuAc compounds in the air.

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38

Wasewar, Kailas L., and Diwakar Z. Shende. "Equilibrium Study for Reactive Extraction of Caproic Acid in Mibk and Xylene." Engineering 03, no. 08 (2011): 829–35. http://dx.doi.org/10.4236/eng.2011.38101.

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39

Mohammad, Sultan, Christoph Held, Emrah Altuntepe, Tülay Köse, and Gabriele Sadowski. "Influence of Salts on the Partitioning of 5-Hydroxymethylfurfural in Water/MIBK." Journal of Physical Chemistry B 120, no. 16 (April 14, 2016): 3797–808. http://dx.doi.org/10.1021/acs.jpcb.5b11588.

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40

YANG, Xiuli, Xiaohui WANG, Chang WEI, Shili ZHENG, and Yi ZHANG. "Low-Acid Extraction of Tantalum from a Tantalum-Niobium Pulp by MIBK." Solvent Extraction Research and Development, Japan 20 (2013): 159–68. http://dx.doi.org/10.15261/serdj.20.159.

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41

Hardcastle, William, and William Barry. "Articulatory and perceptual factors in /l/ vocalisations in English." Journal of the International Phonetic Association 15, no. 2 (July 1989): 3–17. http://dx.doi.org/10.1017/s0025100300002930.

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In several dialects of English notably in the southern part of Britain (but excluding Wales), a velarised or “dark” allophone of /l/ occurs syllable-finally, and post-vocalically in syllable-final consonant clusters (Wells 1982; Gimson 1980). A variant of this velarised [l], typically associated with Cockney, but increasingly admitted as a feature of South-Eastern Urban English, is a “vowelised” or vocalised form realised as a non-syllabic back vocoid (approximately [Y] or a rounded equivalent [ö] or [ʊ] (Wells 1982; Hughes and Trudgill 1986)). Thus “milk” may be realised variously as [mIlk], [mIYk], [mIök] or [mIʊk].

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42

Arifin, Bustanul. "ANALISIS KANDUNGAN LOGAM Cd, Cu, Cr DAN Pb DALAM AIR LAUT DI SEKITAR PERAIRAN BUNGUS TELUK KABUNG KOTA PADANG." Jurnal Dampak 9, no. 2 (July 1, 2012): 116. http://dx.doi.org/10.25077/dampak.9.2.116-122.2012.

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ABSTRAKPenelitian mengenai analisis kandungan logam Cd, Cu, Cr dan Pb dalam air laut telah dilakukan di sekitar perairan Bungus, Teluk Kabung, Kota Padang dengan menggunakan metode ekstraksi pelarut. Hasil penelitian ini bertujuan untuk mengetahui kandungan logam, Cu, Cr dan Pb dan sebarannya di perairan Bungus. Sampel sebanyak 200 mL diekstraksi dengan larutan pengompleks ammonium pyrolidin ditiokarbamat (APDC) jenuh sebanyak 2 mL dalam 7 mL metil isobutyl keton (MIBK) dan diekstrak kembali dengan 5 mL larutan HNO3 4M, larutan diukur absorbannya dengan Spektrofotometer Serapan Atom (SSA). Pengambilan sampel air laut dilakukan sebanyak 6 lokasi yaitu di sekitar Pelabuhan Perikanan Samudera, pantai Carolin, Depot Pertamina, Teluk Pandan, UPTD BBIP (Balai Benih Ikan Pantai) Teluk Buo dan di laut lepas, dimana tiap lokasi diambil 2 titik sampel dengan jarak antar titik sekitar 100 m dengan dua kali pengambilan. Dari hasil penelitian didapatkan bahwa kandungan logam Cd berkisar antara 0,006 0,01 ppm, Cu antara 0,0058 0,0720 ppm, Cr antara 0,0170 - 0,0890 ppm dan kandungan logam Pb berkisar antara 0,06 0,09 ppm. Menurut Keputusan Menteri Negara Lingkungan Hidup No. 51 Tahun 2004 kandungan logam Cr dan Pb telah melampaui standar baku mutu air laut yaitu 0,001 ppm sedangkan kandungan logam Cd dan Cu belum melampaui standar baku mutu air laut. Kata Kunci : ekstraksi pelarut, APDC, MIBK dan SSAABSTRACTResearch on metal concentrations of Cd, Cu, Cr and Pb was analyzed in sea water around Bungus, Teluk Kabung, Padang City by utilizing solvent extraction method. The research was conducted to see metal contents and their distribution in Bungus. Sample of 200 ml was extracted with 2 ml solution of saturated ammonium pyrolidine dithiocarbamate (APCD) in 7 ml methyl isobutyl ketone (IBK) and being extracted again with 5 ml HNO3 4M. Solution was measured its absorbance by using Atomic Absorbtion Spectroscopy (AAS). Sea water samples was taken in six locations; around Samudera Fishery Port, Carolin Beach, gas station, Pandan Bay, UPTD BBIP Buo Bay and in the sea, 2 sampling points were set with 100 m distance between each point. Results show the range of Cd concentration was 0.006-0.01 ppm, Cu was 0.0058-0.0720 ppm, Cr was 0.0170-0.0890 ppm and Pb was 0.06-0.09 ppm. Compared with the regulation of Environment Ministry number 51 Year 2004, concentrations of Cr and Pb exceeded the quality standard of sea water of 0.001 ppm. On the other hand, Cd and Cu concentrations were found below the sea water quality standard.Keywords: AAS, APCD, MIBK, solvent exraction

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43

Sanuki, Sumiko, Kazuhiro Takata, Koichi Arai, Satoshi Sunada, Akio Sugiyama, and Hiroshi Majima. "Mechanism of Reductive Stripping-Precipitation of Ultrafine Au Particles from Au(III)-Loaded MIBK." Journal of the Japan Institute of Metals 57, no. 6 (1993): 645–51. http://dx.doi.org/10.2320/jinstmet1952.57.6_645.

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44

Farré, Rosaura, M. Jesús Lagarda, and Rosa Montoro. "Atomic Absorption Spectrophotometnc Determination of Chromium in Foods." Journal of AOAC INTERNATIONAL 69, no. 5 (September 1, 1986): 876–79. http://dx.doi.org/10.1093/jaoac/69.5.876.

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Abstract A method is reported for determination of chromium in foodstuffs. Organic matter is digested with nitric acid, followed by oxidation to Cr(VI) and extraction with methyl isobutyl ketone (MIBK) after HC1 addition. Chromium determinations are performed by flame absorption spectroscopy. Absence of interferences is verified and recovery tests are performed on food samples. Quantitation limit (3.8 ng/mL), accuracy (NBS Standard Reference Material 1573 Tomato Leaves, 4500 ± 500 ng/g, found 3860 ± 409 ng/g), and precision (CV for vegetable matrix = 9.05%, CV for animal matrix = 14.95%) of the procedure are evaluated.

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45

Montes, M., M. Martin, A. Díaz, J. J. Benítez, and José Antonio Odriozola. "Synthesis of MIBK from Acetone in a Single Step over Ni/AIPON Catalysts." Materials Science Forum 325-326 (January 2000): 83–90. http://dx.doi.org/10.4028/www.scientific.net/msf.325-326.83.

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46

EL-HUSSAINI, OMNEYA MOHAMED, and MOHAMED ABD EL-HAKAM MAHDY. "Extraction of Niobium and Tantalum from Nitrate and Sulfate Media by Using MIBK." Mineral Processing and Extractive Metallurgy Review 22, no. 4-6 (January 2002): 633–50. http://dx.doi.org/10.1080/08827500208547433.

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47

EL-HUSSAINI, OMNEYA MOHAMED, and MOHAMED ABD EL-HAKAM MAHDY. "Extraction of Niobium and Tantalum from Nitrate and Sulfate Media by Using MIBK." Mineral Processing and Extractive Metallurgy Review 22, no. 2 (January 2001): 633–50. http://dx.doi.org/10.1080/08827509808962519.

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48

Zhao, Dong Mei, and Xue Peng Liu. "The Study of Methyl Isobutyl Ketone (MIBK) Synthesis by Acetone in Chemical Engineering." Advanced Materials Research 577 (October 2012): 101–4. http://dx.doi.org/10.4028/www.scientific.net/amr.577.101.

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The cata1yst for the reaction was obtained. The high activity, long-life span, stability and application for industry Pd/Al2O3in chemical engineering was issued. The inf1uence of reaction temperature, pressure, air velocity and ratio of reactant for the yield and selection was discussed, and then the optimum condition was determined

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49

Nieman, J. Karl C., Ronald C. Sims, Judith L. Sims, Darwin L. Sorensen, Joan E. McLean, and James A. Rice. "[14C]Pyrene Bound Residue Evaluation Using MIBK Fractionation Method for Creosote-Contaminated Soil." Environmental Science & Technology 33, no. 5 (March 1999): 776–81. http://dx.doi.org/10.1021/es980609o.

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50

Thorn, K., J. Rice, R. Wershaw, and P. MacCarthy. "C-13 NMR characterization of humic materials isolated by an MIBK partitioning procedure." Science of The Total Environment 62 (January 1987): 185–88. http://dx.doi.org/10.1016/0048-9697(87)90499-2.

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