Showing papers on "Methyl isobutyl ketone published in 1973"

A Simplified Determination of Urinary Cadmium, Lead, and Thallium, with Use of Carbon Rod Atomization and Atomic Absorption Spectrophotometry

Abstract: Lead, cadmium, and thallium are determined in a single 3-ml urine sample. The three metals, simultaneously chelated with sodium diethyldithiocarbamate, are extracted (at pH 3-7) into methyl isobutyl ketone (isopropylacetone), and the carbon rod atomizer, in conjunction with atomic absorption spectrophotometry, is used to analyze the extracts. Small sample requirements (1.6 µl) permit the extraction to be carried out in small-volume disposable glassware, with use of disposable pipets. Within-run coefficients of variation were all less than 5%; recovery ranged from 96-106%. Several normal urinary constituents, added in excess, negligibly affected recoveries. Ethylenediaminetetraacetate in the urine inhibited recovery of lead; this was reversed by adding excess calcium to the urine before extraction. The method of standard additions was used to compensate for differences between standards and unknowns caused by matrix effects.

Process for preparing methyl isobutyl ketone and catalyst

Abstract: Methyl isobutyl ketone is produced in a one-step process by contacting acetone and hydrogen at a temperature of from about 50°-200°C and a pressure between 50-100 atm, preferably 60-100 atm, in the presence of a catalyst composed of a cation exchange resin having from 0.001 to 0.1 weight percent of a noble metal distributed in monoatomic form therein.

The Melting Temperature of a Thermally Reversible Gel. II. Ethylene–Vinyl Acetate Copolymer–Organic Solvent Gels

Abstract: Thermally reversible gels were formed from dilute solutions of ethylene–vinyl acetate copolymer (EVA) in dioxane, ethyl acetate, methyl ethyl ketone, and methyl isobutyl ketone. The power of solvents to form the gels were almost identical. The X-ray diffraction pattern of the EVA gels revealed that the gels were crystalline and that the crystallites, which serve as “cross-links”, consisted of blocks of ethylene units in the copolymer. EVA copolymers, having ethylene mole fractions (XA) from 0.64 to 0.84, and ethyl acetate systems were studied in detail. The linear relationship between the reciprocal absolute melting temperature (Tmg) and the logarithm of v2x was found for each EVA, where v2 is the volume fraction of polymer and x the degree of polymerization. The results were analysed using the theoretical expression given in the previous paper. The analysis leads to the conclusion that the ethylene sequence length in the crystallites, i.e., the block length of ethylene unit in the copolymer, is 10 irrespective of XA. It was also shown that the conclusion is in accordance with the block length estimated by Wu from the 220-MHz NMR spectra of EVA-copolymer solutions.

Determination of Titanium in Some Metallurgical Materials by Atomic Absorption Spectrophotometry

Abstract: The atomic absorption spectrophotometric determination of titanium was subject to interference by other elements in a nitrous oxide-acetylene flame with a Perkin-Elmer Model 303 atomic absorption spectrophotometer, fitted with a 5-cm long-path slot burner. The effects of various other elements, acids, and water-miscible organic solvents on the titanium atomic absorption were examined. Aluminum produced the greatest enhancement of the titanium absorption of all the elements examined. Both butyric acid (2.0 M) and diethylene glycol mono-butyl ether (20%) enhanced the titanium absorption by about 100% in aqueous solutions. In the presence of 5000 ppm aluminum or 20% diethylene glycol monobutyl ether, the interferences from other elements appeared to be completely removed. Furthermore, the extraction of titanium with cupferron into methyl isobutyl ketone was successful in effecting an increase in the sensitivity of titanium and in eliminating, or at least diminishing the interferences from other elements. The...

The Distribution of 2-Thenoyltrifluoroacetone between Several Organic Solvents and an Aqueous Solution and Its Extraction of Sodium (I) into Methyl Isobutyl Ketone

Abstract: Aqueous solutions containing sodium hydroxide and sodium perchlorate at various mixing ratios, 1 M Na-(OH, ClO4), were equilibrated with several organic solvents containing 2-thenoyltrifluoroacetone (TTA) at 25° From the measurements of the hydrogen-ion concentration of the aqueous phase, the (KD+l)Ka−1 values, where KD is the distribution constant and Ka is the acid dissociation constant of TTA, were obtained; they were, 10717(hexane), 10774 (CCl4), 10801 (C6H6) and 10817 (CHCl3) From the values of KD obtained in another study, the value of Ka was determined to be 10−628 However, a much lower value than that expected was obtained for the MIBK system; this was due to the extraction of sodium (I) with TTA The extraction was also confirmed by the distribution experiments of sodium (I) The extraction constant, Kex=[NaA]org/[Na+] [A−] (where A− is the TTA anion), was found from these results to be 10086 in 1 M NaClO4 and 10079 at an infinite dilution

Process for producing 2,3,6-trimethylhydroquinone

Abstract: 1365035 2,3,6-Trimethylhydroquinone KURARAY CO Ltd 20 Feb 1973 [3 March 1972] 8203/73 Heading C2C 2,3,6-Trimethylhydroquinone is prepared by the catalytic hydrogenation of 2,3,6-trimethylp-benzoquinone using a palladium catalyst and an aliphatic ketone as solvent. Suitable ketones are, for example, acetone, methyl isopropyl ketone and methyl isobutyl ketone. The palladium may be supported, e.g. on active carbon, barium sulphate or barium carbonate.

Distribution of Alkali Metal Picrates between Water and Methyl Isobutyl Ketone

Abstract: As regards the distribution of alkali metal picrates between water and methyl isobutyl ketone, distribution ratios of alkali metals and acid species were determined in the pH range 1.5–8.5. The extraction curves are almost the same for each alkali metal. Association constants of the picrates and the dissociation constant of picric acid in the organic phase were determined conductometrically. The association constants of picrates in the aqueous phase were determined with distribution coefficients by means of a solvent extraction method. The results obtained show that the picrates exist mainly in a dissociated form in both phases, whereas picric acid exists in a weakly dissociated form in the organic phase. The extractability of picrates is discussed on the basis of the extraction parameter proposed and compared with that of the nitrobenzene system.

Liquid plastic repair composition and method

Abstract: A plastic repair composition of matter and process for making same. The repair composition comprises a major proportion of a first solvent selected from the group consisting of methyl ethyl ketone, methyl isobutyl ketone, acetone, cyclohexanone, isophorone, ethyl acetate, butyl acetate, xylol, toluene, toluol, amyl acetate, and mixtures thereof. The repair composition additionally includes a minor proportion of a mixture including a second solvent having the formula: wherein R1, R2, R3 and R4 are selected from the group consisting of hydrogen, alkyl hydrocarbons containing from between 1 to 6 carbon atoms, and mixtures thereof, a plasticizer selected from the group consisting of tricresyl phosphate, dioctyl phthalate, and mixtures thereof, a synthetic vinyl polymer resin product selected from the group consisting of vinyl chloride, vinyl acetate, polyvinyl chloride, polyvinyl acetate, and mixtures thereof, and dibutyl tin dilaurate having between about 17 and 20 percent weight tin.

Purification of wet process phosphoric acid using methyl-iso-butyl ketone

Abstract: Wet process phosphoric acid may be purified by solvent extraction to produce a product of greater purity and concentration than has hitherto been attainable by employing an acyclic hexanone, preferably methyl isobutyl ketone as the solvent. Preferably the extraction of the acid into the ketone and the release into water are carried out in 2 actual or theoretical counter - current stages. Alternatively the release may be carried out into an aqueous solution of a base.

Separation of molybdenum from tungsten, vanadium, iron, uranium and several other interfering elements by extraction of its thiosulphato complex

Abstract: A sample solution containing ≦ 0.8 mg Mo/ml 1.5N HCl and 32 mg Na2S2O3 ·5 H2O/ml, is shaken with methyl isobutyl ketone at about 10°. Molybdenum is stripped off the solvent with ammonia-hydrogen peroxide solution and is determined after the filtration of any insoluble hydroxides and decomposition of hydrogen peroxide and any polythionates.

Correcting agent for photomechanically produced printing

Abstract: This invention relates to a correcting agent for photomechanically produced printing forms consisting essentially of 10 to 30 per cent by weight of 2-methoxyethanol or 2-ethoxyethanol, or a mixture of both; 10 to 30 per cent by weight of methyl isobutyl ketone, ethyl isobutyl ketone, or 2,4-dimethyl pentanone(-3), or a mixture of two or all of these ketones; 5 to 20 per cent by weight of dimethyl sulfoxide; 10 to 20 per cent by weight of benzyl alcohol; 10 to 20 percent by weight of phosphoric acid (85%, rest water); 0 to 7 per cent by weight of water (in addition to the water contained in the 85% phosphoric acid solution); 0 to 10 per cent by weight of glycerol; 0 to 20 per cent by weight of finely divided silica, and 0 to 0.1 per cent by weight of a dyestuff.

Some studies on photometric determination of gallium in highly pure indium

Abstract: (1) When the absorption curves of Rhodamine B in 6 M HCl in the presence and in the absence of gallium were measured, no appreciable difference was detected. It may be reasonably concluded that gallium Rhodamine B complex dissociated almost completely in 6 M HCl. (2) The influence of the concentration of HCl on the extractability of gallium in the presence of Rhodamine B into a mixed solvent consisting of 6.5 volumes of benzene and 1 volume of methyl isobutyl ketone was examined. It was found that the extractability was the highest at 6 M HCl. (3) The value of distribution ratio of gallium between the mixed solvent and 6 M HCl was 14 and that between benzene and 6 M HCl was 0.56. (4) From the results of the measurements of the absorption curves of extracts and the extraction coefficients of indium it was concluded that interference of indium with the determination of gallium was caused by the fact that indium rhodamine B complex was extracted. into, the mixed solvent together with gallium Rhodamine B complex. (5) The distribution ratio of indium Rhodamine B complex between the mixed solvent and 6 M HCl was 29×10-2.

Distribution of alkali metal picrates between water and methyl isobutyl ketone

Abstract: As regards the distribution of alkali metal picrates between water and methyl isobutyl ketone, distribution ratios of alkali metals and acid species were determined in the pH range 1.5–8.5. The extraction curves are almost the same for each alkali metal. Association constants of the picrates and the dissociation constant of picric acid in the organic phase were determined conductometrically. The association constants of picrates in the aqueous phase were determined with distribution coefficients by means of a solvent extraction method. The results obtained show that the picrates exist mainly in a dissociated form in both phases, whereas picric acid exists in a weakly dissociated form in the organic phase. The extractability of picrates is discussed on the basis of the extraction parameter proposed and compared with that of the nitrobenzene system.