Showing papers on "Methyl isobutyl ketone published in 1968"

A process for preparing an n-alkyl or n-alkenyl imidazole

Abstract: Imidazoles of the general formula in which R is an alkyl (including aralkyl) group or an alkenyl group, R1 is hydrogen or an alkyl group and R11 and R111 represent hydrogen or alkyl or together with the carbon atoms to which they are attached represent a benzene ring is prepared by reacting the corresponding compound in which R is hydrogen with an alkyl or alkenyl chloride at 90-170 DEG C. in a solvent consisting of one or more alcohols and/or ketones having a boiling point of at least 95 DEG C. (at 760 mm.), the solubility of water in the solvent being 1-30 gm./100 ml. at 20 DEG C., and in the presence of one or more alkali metal or alkaline earth metal oxides or hydroxides in a proportion equivalent to 1-1.2 mols. of sodium hydroxide per mole of the imidazole; separating the solution of the desired compound from the precipitated inorganic salt and, if required, separating the desired compound from the solution. Suitable solvents are, for example, sec- and n-butanol, 2-ethylhexanol, pentanols, diethyl ketone and methyl isobutyl ketone. In the examples compounds of the above formula were prepared in which R1, R11 and R111 are H and R is n-butyl, benzyl, isoamyl, iosubutyl and isopropyl.

Flame Emission Spectromethic Method for Determination of Molybdenum in Steels

Abstract: After normal dissolution steps, molybdenum(VI) is extracted into methyl isobutyl ketone as a suspension of the α-benzoinoxime complex. The solution is cleared with 8-hydroxyquinoline and aspirated into a fuel-rich, oxygen-acetylene flame. Emission intensity is measured at 3798 A. Observation height is slightly above the tip of the blue inner cone. Detection limit is 0.5μ;g/ml. Results are given for several steels.

Preparation of mesityl oxide and/or methyl isobutyl ketone

Abstract: Mesityl oxide is prepared by continuously contacting an oxygenated hydrocarbon feed, which contains acetone, in the gas phase in a condensation zone with a catalyst consisting mainly of zinc oxide at a temperature of about 400 DEG to 800 DEG F., continuously withdrawing a product stream containing mesityl oxide from the condensation zone, cooling the product stream below 120 DEG F., separating a vaporous fraction containing substantial amounts of hydrogen, propylene and acetone and minor amounts of isopropanol, water, methylisobutyl ketone and mesityl oxide from a liquid fraction containing the remainder of the unreacted feed and reaction products, distilling this liquid fraction to recover a fraction rich in unreacted feed and a mesityl oxide-rich fraction, and recycling part of the vaporous fraction and unreacted-feed fraction to the condensation zone in such amounts that the recycled mesityl oxide does not exceed 0.5 mol. per cent of the total feed to the condensation zone. A preferred embodiment involves contacting the mesityl oxide-rich fraction with hydrogen in the presence of a hydrogenation catalyst, suitably nickel, to convert mesityl oxide to methyl isobutyl ketone, fractionating the effluent from the hydrogenation zone to separate methyl isobutyl carbinol, and recycling the methyl isobutyl carbinol and part of the vaporous fraction and unreacted feed fraction to the condensation zone under the same conditions with respect to molar percentage of mesityl oxide recycled. Products can be withdrawn at various stages of the process and can consist essentially of mesityl oxide, methyl isobutyl ketone or methyl isobutyl carbinol. The catalyst for the main reaction in the condensation zone is preferably 70-99% by weight of zinc oxide with 1-30% of a promoter which can be cerium, thorium or zirconium oxide. Preferred conditions in the condensation involve contacting acetone with the catalyst at a space velocity of 0.25 to 2 volumes of total feed per volume of catalyst per hour, in admixture with 0.01 to 1 mol. (or better, 0.01-0.04 mol.) of hydrogen per mol. of acetone at a temperature between 500 DEG and 800 DEG F. and pressure of 5 to 75 p.s.i.g. such that the conversion level of acetone to mesityl oxide is between 7 and 12%, wherein the vaporous fraction of the feed contains less than 0.3 mol. per cent of recycled mesityl oxide and the acetone-rich fraction not more than 0.2 mol. per cent of mesityl oxide.

Antibiotic k-16 and method of production

Abstract: 1,178,783. Antibiotic K-16. KONINKLIJKE NEDERLANDSCHE GIST - EN - SPIRITUSFABRIEK N.V. 26 Jan., 1968 [27 Jan., 1967], No. 4327/68. Heading C2A. An anti-protozoal antibiotic K-16 is produced by cultivating Streptomyces rimosus C.B.S. 569.66 or C.B.S. 570.66 or a K-16 producing- mutant thereof, in an aqueous nutrient medium under aerobic conditions. The antibiotic is isolated from the clarified broth by adjusting to pH 2A0 with acid, removing impurities, adjusting to pH 10 with alkali, removing impurities and adding a water-miscible solvent such as methanol, ethanol or acetone, to precipitate the antibiotic. Preferably, a complexing agent such as the ammonium salt of ethylene diamine tetraacetic acid is added to the solution prior to the precipitation step. The crude K-16 is dissolved in water at an alkaline pH and passed through a column of amberlite IRA 402 (in OH form), which is a strongly basic ion exchange resin. The antibiotic is eluted with acid, e.g. acetic acid containing ammonium acetate. Further purification is obtained by dissolving in aqueous ammonia, treating with charcoal and adjusting to pH 3 with acid to precipitate the antibiotic. Antibiotic K-16 is a white crystalline, amphoteric solid; sparingly soluble in water but easily dissolvable in water or addition of acid or alkali; moderately to slightly soluble in dimethylsulphoxide, dimethyl-formamide, nitrobenzene, tetrahydrofuran, dioxane, pyridine, acetonitrile, acetone, methyl isobutyl ketone, methanol, ethanol, n-butanol, diethyl ether, benzene and ethyl acetate; elementary analysis C = 38A9-40A4%, H = 5A6-5A9%, N = 13A0-13A5%; empirical formula C 14 H 18 O 10 N 4 ; [α] 23 D = - 68A8‹ C. (1% water); U.V. (Fig. 1, not shown) maxima at 24.2 mA (E 1% 1cm = 290) and 278 mA (E 1% 1cm = 313); I.R. spectrum as in Fig. 2; decolorizes KMnO 4 and bromine solutions; red colour with cone. H 2 SO 4 on acid hydrolysis yields serine and aspartic acids, A pharmaceutical composition comprises the antibiotic K-16 and a carrier.

Flame emission spectrometric method for niobium in steels

Abstract: Following the dissolution steps, niobium(V) is extracted into methyl isobutyl ketone in the form of a heptafluoride complex. Stannous chloride is added to the aqueous solution to reduce iron(III) to an unextracted iron(II) species. The organic solution is then aspirated into a fuel-rich acetylene-oxygen flame and the emission intensity measured at 4059 A. Optimum observation height is slightly above the tip of the blue inner cone. Detection limit is 13 μg/ml. Results are given for two steel samples.

Improvements in and relating to polyester resins

Abstract: The invention comprises an alkyd resin derived from castor oil or castor oil fatty acids, a dimeric acid and a polyhydric alcohol. The dimeric acid is the product of polymerization of an unsaturated fatty acid or conjugated poly-unsaturated fatty acid or mixture thereof. The products of polymerization of mixture rich in linoleic acid (e.g. containing 30-70% thereof) are particularly suitable. The dimeric acid may be replaced up to 50% by other dicarboxylic acids, e.g. adipic, succinic, azelaic and sebacic acids. A suitable polyhydric alcohol is glycerol. The resin may be mixed, as plasticizer, with nitrocellulose, ethylcellulose, urea-formaldehyde or melamine-formaldehyde resins in surface coating compositions. In the examples castor oil fatty acids and glycerol are condensed with a dimeric acid or dimeric acid/adipic acid mixture, and the product alkyds are mixed with urea-formaldehyde resin in xylol, and with solutions of nitrocellulose in methyl isobutyl ketone and ethylcellulose in 80/20 xylene/butanol to give lacquers.ALSO:A burnished steel plate is coated with (1) a solution in xylol of 10 p.b.w. of a castor oil fatty acid/dimerized fatty acid/glycerol alkyd and 40 p.b.w. of a urea-formaldehyde resin or a solution in methyl isobutyl ketone of nitrocellulose containing 10-35 wt.% (total solids) of the same alkyd; (2) a solution in methyl isobutyl ketone of 10 p.b.w. nitrocellulose and 2.5 p.b.w. of an adipic acid/castor oil fatty acid/dimerized fatty acid/glycerol alkyd or a solution in 80:20 xylene/butanol of 10 p.b.w. ethylcellulose and 3.3 p.b.w. of the same alkyd.

Process for the preparation of Higher Ketones, Higher Aldehydes and Higher Alcohols

Abstract: 1,183,664. Alcohols, aldehydes and ketones. SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V. 11 March, 1968, No. 11709/68. Heading C2C. In a process for the preparation of ketones and/or aldehydes and/or alcohols, a feed comprising at least one non-tertiary aliphatic alcohol is contacted with a catalyst containing copper, chromium and at least two rare earths and/or oxides and/or hydroxides and/or salts of such metals. Specified feeds may contain methanol, ethanol, propanol-1, butanol-1, isobutanol, pentanol-1, isopropanol, butanol-2, pentanol-2 and pentanol-3. In examples, isopropanol is connected inter alia to methyl isobutyl ketone, diisobutyl ketone, methyl isobutyl carbinol and acetone.

Concurrent Determination of Magnesium and Calcium in Iron Ores by Atomic Absorption Spectroscopy

Abstract: Examinations were made for the concurrent determination of magnesium and calcium in iron ores when present in about equal amounts, using the magnesium-calcium coupled type hollow-cathode lamp in atomic absorption spectroscopy, and a method of measurement was established. Concurrent determination was found to be easily possible by removal of the majority of iron by extraction with methyl isobutyl ketone and addition of strontium. Analytical precision was calculated and found to give satisfactory results (standard deviations: ±0.004% for Ca, ±0.006% for Mg).

Process for the production of azines and hydrazine

Abstract: 1,137,505. Azines. FISONS INDUSTRIAL CHEMICALS. 4 April, 1966 [23 April, 1965], No. 17161/65. Heading C2C. [Also in Division C1] Azines are produced by reacting an aqueous hypochlorite salt with aqueous ammonia in the absence of carbonyl compounds to form chloramine and reacting this with a carbonyl compound and aqueous ammonia to form the azine of the carbonyl compound used. The preferred hypochlorite salt is sodium hypochlorite. The carbonyl compound used in the second stage may have the formula in which R 1 is hydrogen, alkyl and R 2 is alkyl or aryl or R 1 and R 2 together with the carbon atom to which they are attached form a cycloaliphatic ring. Suitable carbonyl compounds are, for example, acetaldehyde, propionaldehyde, methyl isobutyl ketone, diethyl ketone, benzaldehyde, cyclohexanone and, particularly, acetone and methyl ethyl ketone.