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Showing papers on "Methyl isobutyl ketone published in 1993"


Journal ArticleDOI
TL;DR: In this paper, the removal of mixtures of two ketones, methyl ethyl ketone (MEK) and methyl isobutyl (MIBK), from effluent air streams in downward flow biofilters operating at relative humidities in excess of 95 percent was reported.
Abstract: The work reported concerns the removal of mixtures of two ketones, methyl ethyl ketone (MEK) and methyl isobutyl ketone (MIBK), which find wide application as industrial solvents, from effluent air streams in downward flow biofilters operating at relative humidities in excess of 95 percent. The inlet concentrations of the two pollutants were 300 mg m−3MEK and 330 mg m−3MIBK. Maximum elimination capacities achieved were 50 g m−3h−1 for MEK and 20 g m−3h−1 for MIBK. Marked interaction between the elimination of the two ketones was observed and established biophysical models for the kinetic analysis of biofilter operation proved inadequate as far as the complex processes involved in multi-component biodegradable vapour elimination were concerned. The complexity of such systems requires further definition and the development of appropriate models for process evaluation and design.

78 citations


Journal ArticleDOI
TL;DR: In this article, the NRTL and UNIQUAC equations have been fitted to the experimental data by optimizing their system-specific parameters; the goodness of fit is satisfactory in both cases.
Abstract: Liquid-liquid equilibrium data are reported for the binary system water + methyl isobutyl ketone over the range 20–55 °C and for the ternary system water + propanoic acid + methyl isobutyl ketone at 25, 35, 45, and 55 °C. The NRTL and UNIQUAC equations have been fitted to the experimental data by optimizing their system-specific parameters; the goodness of fit is satisfactory in both cases. © 1993, American Chemical Society. All rights reserved.

57 citations


Journal ArticleDOI
TL;DR: In this article, a new catalyst for the production of methyl isobutyl ketone (MIBK) from acetone and hydrogen in one step at atmospheric pressure has been prepared.
Abstract: A new catalyst for the production of methyl isobutyl ketone (MIBK) from acetone and hydrogen in one step at atmospheric pressure has been prepared. The catalyst was obtained by impregnation of MgO with an aqueous solution of nickel nitrate, dried, calcined in air and reduced in hydrogen. This catalyst showed a high selectivity to MIBK, reaching in some experiments between 60 and 80%. A loss of activity with time on stream, probably due to coke deposition was also found. An increase in reduction temperature from 300 to 500 °C gives a decrease in MIBK selectivity that is due to an increase in the yield of 2-propanol.

48 citations


Journal ArticleDOI
TL;DR: This paper describes a method for the determination of heavy metals in urine by inductively coupled plasma atomic emission spectrometry (ICP-AES), which can be applied conveniently for toxicological diagnostic purposes.
Abstract: This paper describes a method for the determination of heavy metals (Co, NI, Cu, Cd, Pb) in urine by inductively coupled plasma atomic emission spectrometry (ICP-AES). The method proposed requires purification of the samples with activated charcoal under acidic conditions before preconcentration by complexation with ammonium pyrrolidlnedithlocarbamate (APDC). The formed complexes are extracted with methyl isobutyl ketone (MIBK) and the resulting residue Is finally digested under acid oxidant conditions. Because of its low detection limit (below 10 I~g/L), this procedure can be applied conveniently for toxicological diagnostic purposes.

27 citations


Patent
07 Jan 1993
TL;DR: In this paper, a process for producing acrylic acid is described, which process comprising providing a mixed gas of acrylic acid and by-products produced by catalytic gas phase oxidation of propylene and/or acrolein.
Abstract: A process for producing acrylic acid is described, which process comprising providing a mixed gas of acrylic acid and by-products produced by catalytic gas phase oxidation of propylene and/or acrolein, contacting the mixed gas with water to obtain an aqueous solution, and adding an azeotrope solvent to the aqueous solution for distillation to obtain a mixture of the by-products, water and the azeotrope solvent from a tower top and acrylic acid from a tower bottom. Highly pure acrylic acid is obtained by using, as the azeotrope solvent, a mixed solvent of solvent A selected from diethyl ketone, methyl propyl ketone, methyl isobutyl ketone, methyl-tert-butyl ketone, n-propyl acetate and mixtures thereof and solvent B selected from toluene, heptane, methyl cyclohexane and mixtures thereof.

24 citations


Patent
06 Jan 1993
TL;DR: In this paper, a process for producing acrylic acid is described, which process comprising providing a mixed gas of acrylic acid and by-products produced by catalytic gas phase oxidation of propylene and/or acrolein.
Abstract: A process for producing acrylic acid is described, which process comprising providing a mixed gas of acrylic acid and by-products produced by catalytic gas phase oxidation of propylene and/or acrolein, contacting the mixed gas with water to obtain an aqueous solution, and adding an azeotrope solvent to the aqueous solution for distillation to obtain a mixture of the by-products, water and the azeotrope solvent from a tower top and acrylic acid from a tower bottom. Highly pure acrylic acid is obtained by using, as the azeotrope solvent, a mixed solvent of solvent A selected from diethyl ketone, methyl propyl ketone, methyl isobutyl ketone, methyl-tert-butyl ketone, n-propyl acetate and mixtures thereof and solvent B selected from toluene, heptane, methyl cyclohexane and mixtures thereof.

22 citations


Journal ArticleDOI
TL;DR: In this paper, the cooperative effect between polar neutral organic molecules and non-polar hydrocarbon oil droplets on the extraction of fine quartz from the aqueous phase into the oil phase was estimated by measuring the oil/water interfacial tensions and contact angles on a quartz surface in water.

14 citations


Journal ArticleDOI
TL;DR: In this paper, a 1:1 synthesis of 2-quinolylhydrazine with 2-2-pyridil yields the hydrazone 2,2′-polymorphic polygonal 2-polygonal polymorphic 2-Quinelyl hydrazine.

11 citations


Patent
20 Aug 1993
TL;DR: In this article, a cyanate compound is obtained by adding a t-amine such as triethylamine and a cyanogen halide such as cyanogen chloride at the same time to a bisphenol compound of formula I (A is H or a 1-6C alkyl; X is single bond, a 1 -20C organic group, carbonyl, sulfone, S or O).
Abstract: PURPOSE: To easily obtain a cyanate compound in high safety, purity and yield by simultaneously adding a t-amine and a cyanogen halide to a specific bisphenol compound, reacting the compounds with each other, washing the product and separating the liquid phases. CONSTITUTION: The objective cyanate compound is produced by adding (A) a t-amine such as triethylamine and (B) a cyanogen halide such as cyanogen chloride at the same time to (C) a bisphenol compound of formula I (A is H or a 1-6C alkyl; X is single bond, a 1-20C organic group, carbonyl, sulfone, S or O; (i) is 0-4) in the presence of a solvent forming separable phases with water such as methyl isobutyl ketone, subjecting the reaction product to the washing with water and the separation into liquid phases to remove the t-amine hydrohalogenic acid salt, contacting the obtained solution (concentrate) with a poor solvent selected from sec-alcohols, t-alcohols and hydrocarbons to cause the crystallization or precipitation and obtain purified product. The compound is useful as a sealing resin for electronic parts or a resin for laminated board, composite material, molded article or adhesive.

10 citations


Journal ArticleDOI
01 Jan 1993-Polymer
TL;DR: In this paper, the concentration and temperature dependences on micelle formation by a polystyrene block -poly(ethylene/propylene) copolymer in several ketones (methyl-ethyl ketone, methyl propyl ketone and 5-methyl-3-heptanone) by laser light scattering and viscometry.

9 citations


Journal ArticleDOI
TL;DR: In this article, a method is described for the flame atomic absorption spectrometry (AAS) determination of vanadium, down to microgram level, in food samples and petroleum crudes.
Abstract: A method is described for the flame atomic absorption spectrometry (AAS) determination of vanadium, down to microgram level, in food samples and petroleum crudes. The procedure is based on the synergistic extraction of the V(V)-5,5′-methylene-disalicylohydroxamic acid (MEDSHA) complex with a 0.5 M tributyl phosphate (TBP) solution in isobutyl methyl ketone (IBMK). The method is highly selective and has a detection limit of 0.019 μg.ml−1 (Vorg./Vsq. = 0.2) and of 0.006 μg.ml−1 (Vorg./Vsq. = 0.05), with a relative standard deviation (RSD) not exceeding 1.5% at a level of 2 μg.ml−1 and 3% at a level of 0.4 μg.ml−1.

Patent
28 Jun 1993
TL;DR: In this article, a skin making ink composition consisting of a solvent component essentially consisting of at least one member selected from among methyl acetate, ethyl acetate and butyl acyclic acid, amylacetate, methyl ethyl ketone and methyl isobutyl kone, a non-red color component soluble in the solvent component, and a binder component mainly consisting of beta-ethoxyethyl methacrylate resin.
Abstract: PURPOSE:To obtain a new skin marking ink composition excellent in adhesion to the skin, affected little by sweat and having a color different from that of laser beam. CONSTITUTION:This skin making ink composition comprises a solvent component essentially consisting of at least one member selected from among methyl acetate, ethyl acetate, butyl acetate, amyl acetate, methyl ethyl ketone and methyl isobutyl ketone, a non-red color component soluble in the solvent component, and a binder component mainly consisting of a beta-ethoxyethyl methacrylate resin. Another skin marking ink composition comprises the above composition wherein the solvent component further contains at least a 2 or 3C aliphatic alcohol. Still another skin marking ink composition comprises the above composition wherein at least one polyhydric alcohol soluble in the solvent component is further contained.

Patent
20 Jul 1993
TL;DR: In this article, the authors proposed a method to obtain the title coating material which is excellent in resistance to electrolysis by seawater and can maintain the effect of preventing the adhesion of marine organisms over a wide area for a long period of time, by using a specified copolymer resin, a conductive filler and a solvent as the constituents.
Abstract: PURPOSE:To obtain the title coating material which is excellent in resistance to electrolysis by seawater and can maintain the effect of preventing the adhesion of marine organisms over a wide area for a long period of time, by using a binder comprising a specified copolymer resin, a conductive filler and a solvent as the constituents. CONSTITUTION:The title coating material contains: a binder comprising a copolymer resin which consists at least of 80-98.5wt.% methyl methacrylate component, 1-15wt.% of at least one monomer component selected from among (meth)acrylic esters (except methyl methacrylate) (e.g. butyl methacrylate), and 0.5-5wt.% of at least one monomer component selected from among an unsaturated dicarboxylic acid, a phosphoric ester, a sulphonic ester, an aminated vinyl monomer and an epoxidized vinyl monomer (e.g. maleic anhydride), the total of these components accounting for at least 90wt.% of the copolymer; a conductive filler (e.g. graphite powder); and a solvent (e.g. toluene and methyl isobutyl ketone).

Journal ArticleDOI
TL;DR: An electrothermal atomization atomic absorption spectrometric method for the determination of traces of nickel after extraction of the metal into methyl isobutyl ketone containing 1,5-bis[phenyl(2-pyridyl)methylene] thiocarbonhydrazide is suggested in this article.

Journal ArticleDOI
TL;DR: The determination of nickel by ETA-AAS and ICP-AES in biological samples with prior extraction into methyl isobutyl ketone with 1,5-bis(di-2-pyridylmethylene) thiocarbonohydrazide as extracting reagent is described in this paper.
Abstract: The determination of nickel by ETA-AAS and ICP-AES in biological samples with prior extraction into methyl isobutyl ketone with 1,5-bis(di-2-pyridylmethylene) thiocarbonohydrazide as extracting reagent is described. Microwave dissolution in closed teflon vessels has been used for the dissolution of biological materials. At least three samples can be decomposed simultaneously with a preset heating programme. Results of analyses of some certified biological reference materials are given.

Journal ArticleDOI
01 May 1993-Talanta
TL;DR: The synthesis, physicochemical properties and interactions of two new thiocarbohydrazones, namely 1,5-bis[1-(2-pyridyl) ethylidene] thiOCarbonohydrazide (APTH and BPTH) have been studied, and these are extractable into methyl isobutyl ketone.

Patent
11 Jan 1993
TL;DR: In this paper, a method of regenerating waste polyvinyl chloride according to the present invention includes the steps of bringing polyvinylene chloride-containing industrial waste into contact with a solvent in which polyvinel chloride can be dissolved, to elute polyvinl chloride from the industrial waste, removing substances which cannot be dissolved in this solvent from a polyvinylon chloride solution consisting of the solvent and the polyvinil chloride dissolved therein, and recovering regenerated polyvinly chloride as a substance left over when the solvent is removed from the polymineral solution.
Abstract: A method of regenerating waste polyvinyl chloride according to the present invention includes the steps of bringing polyvinyl chloride-containing industrial waste into contact with a solvent in which polyvinyl chloride can be dissolved, to elute polyvinyl chloride from the industrial waste, removing substances which cannot be dissolved in this solvent from a polyvinyl chloride solution consisting of the solvent and the polyvinyl chloride dissolved therein, and recovering regenerated polyvinyl chloride as a substance left over when the solvent is removed from the polyvinyl solution. The industrial waste to be regenerated includes polyvinyl chloride chips obtained from waste electric wires, polyvinyl chloride-impregnated wall paper and used agricultural polyvinyl chloride sheets. The solvent used in the present invention consists of at least one kind of organic solvent selected from the group composed of methyl ethyl ketone, methyl isobutyl ketone and dioctyl phthalate.

Journal ArticleDOI
TL;DR: A method for the determination of mercury in workplace environments in a chlor-alkali plant was optimized in this paper, where the mercury was determined by coldvapour atomic-absorption spectrometry (CVAAS).
Abstract: A method for the determination of mercury in workplace environments in a chlor-alkali plant was optimized. Mercury was collected on activated carbon with a personal sampling pump at a flow-rate of 0.5 l/min, then the carbon was mineralized by heating with potassium permanganate and sulphuric acid. The mercuric ion was next chelated with ammonium pyrrolidinedithiocarbamate and extracted with methyl isobutyl ketone at acidic pH (1.6–5). The chelate in the extract was decomposed with sulphuric acid and the mercuric ion reduced to the metal with stannous chloride. The mercury was determined by coldvapour atomic-absorption spectrometry (CVAAS). The calibration graph was linear up to 5 ng/ml Hg in the initial solution, the relative standard deviation was 4.5% (for 2 ng/ml) and the detection limit was 0.14 ng/ml. All the figures of merit are referred to the initial sample. The proposed method gave good accordance with CVAAS without extraction.

Patent
02 Mar 1993
TL;DR: In this paper, a photo-sensitive heat-resistant polypropane resin resinque was proposed to simplify the production process of multi-layer wiring devices and improve reliability of a multilayer wiring device by reducing the dielectric constant of interlaminar film.
Abstract: PURPOSE:To obtain the title new resin providing a photosensitive heat-resistant resin composition capable of simplifying a production process of multi-layer wiring device and improving reliability of a multi-layer wiring device by reduction in dielectric constant of interlaminar film CONSTITUTION:The title resin having a unit shown by formula I (R1 is 2-5C alkenyl; R2 is 1-5C alkyl or phenyl), having 10-10,000 degree of polymerization The resin, for example, is obtained by dissolving hexafluoro-2,2-bis (4- hydroxyphenyl)propane shown by formula II with biphenyldichlorosilane shown by formula III in methyl isobutyl ketone and hydrolyzing the compounds in the presence of pyridine as a catalyst The photosensitive heat-resistant resin composition is formed by dissolving the fluorine-containing silicone resin and a sensitizer in an organic solvent

Patent
02 Mar 1993
TL;DR: In this article, a polycarbonate resin plate is coated with a coating solution prepared by blending a curable phosphazene compound with methyl isobutyl ketone as a solvent and p-chlorobenzophenone as an initiator, cured by irraidiating with high pressure mercury lamp light.
Abstract: PURPOSE:To obtain the title article useful for window glass, having a static contact angle of surface to water of >=a specific value by hydrophilic treatment, excellent non-fogging properties, transparency and scratching properties and high surface hardness, comprising a polymer compound containing P=N skeleton. CONSTITUTION:A polycarbonate resin plate, etc., is coated with a coating solution prepared by blending a curable phosphazene compound shown by formula I (R is group shown by formula II) with methyl isobutyl ketone as a solvent and p-chlorobenzophenone as a photopolymerization initiator, cured by irraidiating with high-pressure mercury lamp light, the laminate is immersed in 20 % aqueous solution of NaOH (25 deg.C) for 20 minutes, washed with water, dried to give the objective hydrophilic article having the surface comprising a polymer compound containing-P=N-skeleton, >=40 deg. static contact angle of surface to water and non-fogging properties, transparency and scratching properties.

Patent
06 Apr 1993
TL;DR: In this article, a malonic diester of formula (i) (R is 1-2C alkyl) is reacted with magnesium ethylate of formula and acetylsalicylic acid chloride of formula to give a 2-(2-acethoxybenzoyl)malonic acid dialkyl ester, which is subjected to ring formation with a mineral acid to produce a 3-alkoxy-4-hydroxycoumarin of formula.
Abstract: PURPOSE:To produce a 3-alkoxycarbonyl-4-hydroxycoumarin on an industrial scale, useful as an intermediate for medicine, agricultural chemical, especially rodenticide by preventing thickening phenomena of reaction system by the use of a specific solvent. CONSTITUTION:A malonic diester of formula (i) (R is 1-2C alkyl) is reacted with magnesium ethylate of formula (ii) and acetylsalicylic acid chloride of formula (iii) to give a 2-(2-acethoxybenzoyl)malonic acid dialkyl ester of formula (iv), which is subjected to ring formation with a mineral acid to produce a 3-alkoxy-4-hydroxycoumarin of formula (v). In the production, an aliphatic nitrile (e.g. acetonitrile, propionitryl or butyronitrile) or an aliphatic ketone (preferably 3-6C ketone, especially methyl ketone or methyl isobutyl ketone) is used as a solvent and the amount of the solvent used is >=twice as much as, preferably 5-10 times as much as the amount of the compound of formula (iii) so that formation of muddiness and lump is prevented to produce the objective compound industrially.

Journal ArticleDOI
TL;DR: The Ketones Panel of the Chemical Manufacturers Association has sponsored a number of studies and surveyed all the pertinent literature on these two compounds and is not aware of any evidence suggesting that either MIBK or MEK causes cancer in humans or animals.
Abstract: Methyl Ethyl Ketone and Methyl Isobutyl Ketone Not Carcinogenic The April 22, 1993, issue of Environmental Health Perspectives contained a commentary by Legator and Strawn entitled \"Public Health Policies Regarding Hazardous Waste Sites and Cigarette Smoking: An Argument by Analogy.\" Although the article does not include any discussion of either methyl ethyl ketone (MEK) or methyl isobutyl ketone (MIBK), it does list them in Table 3 as substances that cause cancer in animals and/or humans.\" Because MEK and MIBK are both widely used industrial chemicals, they have been studied extensively for possible human health or environmental effects. The Ketones Panel of the Chemical Manufacturers Association has sponsored a number of the studies and surveyed all the pertinent literature on these two compounds. The panel is not aware of any evidence suggesting that either MIBK or MEK causes cancer in humans or animals. Indeed, neither MEK nor MIBK is known or reasonably expected to cause any type of chronic health effect in humans. MEK has been shown to be inactive in a wide variety of in vitro and in vivo genetic toxicity assays and was not neurotoxic in five recent studies. Although MEK has not been tested specifically for carcinogenicity, the data on its structure and metabolism, the results of numerous subchronic studies, and the absence of genotoxicity indicate that MEK is highly unlikely to pose a cancer risk. With respect to MIBK, inhalation studies conducted with rats, mice, dogs, and monkeys all indicate a very low order of subchronic toxicity. The results from a number of different mutagenicity screening assays show that MIBK exhibits very little, if any, mutagenic activity. Existing studies also demonstrate that MIBK is not teratogenic and exhibits low reproductive toxicity. As with MEK, MIBK has not been tested specifically for carcinogenicity because data on its structure and metabolism, subchronic health effects, and genotoxicity indicate that it is highly unlikely to pose a cancer risk. If you are aware of any evidence that either MEK or MIBK is carcinogenic, please notify the panel. If not, we request that you publish a correction in order to set the record straight. Inaccurate and misleading information, even from a single publication, can have a significant impact. We therefore ask that you take the steps necessary to correct the false impression that has been created by your April 22, 1993, publication. If you have any questions or wish to provide information on either of these these compounds, please contact Barbara Francis, manager of the Ketones Panel, at (202) 887-1314.

Patent
22 Feb 1993
TL;DR: Toluene cannot be separated from methyl isobutyl ketone by conventional distillation or rectification because of the minimum boiling azeotrope as discussed by the authors, but Toluene can be readily separated using azeotropic distillation by using 1-butanol, 2-methoxyethanol and n-heptane.
Abstract: Toluene cannot be separated from methyl isobutyl ketone by conventional distillation or rectification because of the minimum boiling azeotrope. Toluene can be readily separated from methyl isobutyl ketone by using azeotropic distillation. Typical examples of effective agents are 1-butanol, 2-methoxyethanol and n-heptane.

Journal ArticleDOI
TL;DR: In this paper, a new catalyst for the production of methyl isobutyl ketone (MIBK) from acetone and hydrogen in one step at atmospheric pressure has been prepared.
Abstract: A new catalyst for the production of methyl isobutyl ketone (MIBK) from acetone and hydrogen in one step at atmospheric pressure has been prepared. The catalyst was obtained by impregnation of MgO with an aqueous solution of nickel nitrate, dried, calcined in air and reduced in hydrogen. This catalyst showed a high selectivity to MIBK, reaching in some experiments between 60 and 80%. A loss of activity with time on stream, probably due to coke deposition was also found. An increase in reduction temperature from 300 to 500 °C gives a decrease in MIBK selectivity that is due to an increase in the yield of 2-propanol.

Patent
22 Nov 1993
TL;DR: A process for the production of zirconium or hafnium rich aqueous solutions containing a substantial concentration of the hydroxychloride of the metal is described in this paper.
Abstract: A process for the production of zirconium or hafnium rich aqueous solutions containing a substantial concentration of the hydroxychloride of the metal comprising the steps of providing a zirconium or hafnium containing chloride or oxychloride produced from zirconium or hafnium tetrachloride; oxidizing the chloride or oxychloride sufficiently to evolve substantially all the excess chlorine over that which would be present as the hydroxychloride of the metal; and recovering an aqueous solution of the resultant hydroxychloride having at least 25 % by weight of the metal calculated as its oxide and a chlorine to metal ratio of from about .75 to about 1.5. The aqueous solution is prepared by dissolving zirconium or hafnium tetrachloride in water before oxidizing. The process includes the aqueous solution being extracted with an organic solvent such as methyl isobutyl ketone which is capable of removing substantially all of the iron impurity present in the aqueous solution.

Patent
30 Mar 1993
TL;DR: In this article, a tetraalkylbenzene is oxidized with an oxygen-containing gas in the vapor phase by a well-known method and the resultant crude pyromellitic anhydride is then heated at >=50 deg.C with a solvent selected from gamma- butyrolactone, propylene carbonate and cyclohexanone to afford the objective substance.
Abstract: PURPOSE:To obtain the subject compound useful as a raw material for polymers in high purity and yield by oxidizing a tetraalkylbenzene in the vapor phase, then washing and recrystallizing the resultant crude pyromellitic anhydride with a solvent. CONSTITUTION:A tetraalkylbenzene is oxidized with an oxygen-containing gas in the vapor phase by a well-known method and the resultant crude pyromellitic anhydride is then heated at >=50 deg.C and washed with a solvent selected from 1,4-dioxane, ethyl acetate, methyl ethyl ketone, acetone, methyl isobutyl ketone and cyclohexanone. The washed crude pyromellitic anhydride is subsequently recrystallized at 130-180 deg.C with a solvent selected from gamma- butyrolactone, propylene carbonate and cyclohexanone to afford the objective substance. The washing solvent is used in an amount of 1-10 pts.wt. based on 1 pt.wt pyromellitic anhydride containing impurities and the recrystallizing solvent is used in an amount of 1-5 pts.wt. (in the case of the gamma-butyrolactone) based on 1 pt.wt. pyromellitic anhydride after the washing.

Patent
16 Apr 1993
TL;DR: In this paper, the authors propose to improve loading suitability to improve the heat stability and other properties of a molding by improving both flowability and torque for melt kneading.
Abstract: PURPOSE:To improve loading suitability to thereby improve the heat stability and other properties of a molding by improving both flowability and torque for melt kneading CONSTITUTION:The title material comprises 02-10wt% substance having a boiling point of 80-180 degC, such as methyl isobutyl ketone, toluene, xylene, or ethylene glycol