Showing papers on "Methyl isobutyl ketone published in 1969"

Determination of gold in waters in the nanogram range by anion exchange and atomic absorption spectrophotometry

Abstract: A method has been developed whereby nanogram amounts of gold in waters can be accurately determined. The development of the method involves determination of optimum conditions for the complete recovery of gold from water using an anion exchange resin column, quantitative elution of gold from the resin, and final measurement of gold by atomic absorption spectrophotometry following MIBK (methyl isobutyl ketone) extraction of gold from a nitric acid solution.

Production of saturated carbonyl compounds

Abstract: THIS SPECIFICATION DESCRIBES A NOVEL PROCESS FOR THE ALDOL CONDENSATION OF CARBONYL-CONTAINING COMPOUNDS OF RELATIVELY LOW MOLECULAR WEIGHT TO PRODUCE HIGHER MOLECULAR WEIGHT A-B UNSATURATED CARBONYL COMPOUNDS WHICH ARE HYDROGENATED TO SATURATED CARBONYL COMPOUNDS AS THEY ARE PRODUCED. THERE IS DESCRIBED A NOVEL CATALYST FOR THIS REACTION WHICH IS A STRONGLY ACID CATION EXCHANGE RESIN HAVING METALLIC REDUCED NOBLE METAL DEPOSITED THEREON. THE PROCESS IS CARRIED OUT USING A SOLID BED CATALYST IN A TRICKLE PHASE. PARTICULARLY EXEMPLIFIED IS THE PRODUCTION OF METHYL ISOBUTYL KETONE BY THE SELF-CONDENSATION OF ACETONE.

Minor Constituents of Japanese Ho-Leaf Oil

Abstract: The main component of Japanese Ho-leaf oil has been shown to be (-)-linalool (80_??_90%), and the following twenty minor constituents newly have been identified; methyl vinyl ketone, methyl isobutyl ketone, mesityl oxide, β-pinene, myrcene, (+)-limonene, cis- and trans-ocimene, n-hexanol, cis-3-hexenol, cis- and trans-linalool oxide, (-)-l-terpinen-4-ol, (+)-cis. and (+)-trans-2, 6, 6-trimethyl-2-vinyl-5-hydroxytetrahydropyran, citronellol, nerol, (+)-β-selinene, (+)-tagetonol and (-)-trans-hotrienol. (+)-Tagetonol and (-)-trans-hotrienol have been demonstrated to be (+)-3, 7-dimethyl-3-hydroxy-l-octen-5-one (III) and (3R)-(-)-trans-3, 7-dimethyl-3-hydroxy-1, 5, 7-octatriene (IX), respectively.

Method for production of methyl isobutyl ketone

Abstract: A novel method for producing methyl isobutyl ketone from acetone and hydrogen in one stage with improved conversion and selectivity by contacting acetone in liquid phase with hydrogen in the presence of a catalyst of (a) palladium and synthetic zeolite, or (b) palladium and alumina together with or without thorium oxide, zirconium oxide and/or chromium oxide, at a temperature of 100 DEG to 250 DEG C. and under a partial pressure of hydrogen of 0.1 to 10 kg per square centimeter.

Determination of Arsenic in Organic Compounds and Other Matrices by Flame Emission Spectrometry

Abstract: A direct and simple method for arsenic in organic compounds involves merely dissolution of the sample in an organic solvent, such as benzene, cyclohexane, or methyl isobutyl ketone, and direct aspiration into a fuel-rich acetylene-oxygen flame. The arsenic line at 2350 A is used; the detection limit is 2.2 u/ml. From iron and copper matrices arsenic is isolated by extraction from a solution 9 M in HCI and 0.25 M in KI with benzene.

Improvements in or relating to Electrical Insulation

Abstract: 1,169,692. Mica coatings. ENGLISH ELECTRIC CO. Ltd. 20 Oct., 1966 [22 July, 1965; 24 Aug., 1965], Nos. 31336/65 and 36407/65. Heading B2E. [Also in Divisions B5 and H1] Mica tape or sheet for use in electrical insulation is prepared by coating a tape or sheet of backing material with a resin bonding agent comprising an epoxy phenolic resin which is applied in solution in a mixture of two solvents which have different boiling points from each other, the phenolic resin component of the epoxy phenolic resin having been precondensed to such an extent that only very small amounts of volatile material will be released during gellation and virtually none during curing of the epoxy phenolic resin, placing at least one layer of mica flakes or mica paper on the resin coated backing material, and heating the resin bonding agent at least to the stage of gellation. The precondensed resin may be applied to the backing material in solution in a mixture of methyl ethyl ketone and methyl isobutyl ketone which may contain between 40 and 60% by wt. methyl ethyl ketone. The backing material may be impregnated with the solution of epoxy phenolic resin in a mixture of methyl ethyl ketone and methyl isobutyl ketone, heated to the stage of gellation of the resin, a layer of mica paper placed on the impregnated backing material and attached thereto by application of heat and pressure. The phenolic resin content of the epoxy phenolic resin may be between 25 and 35% by wt. Suitable backing materials are glass cloth, silk, synthetic fabrics, or mixtures of such materials. Thes olution of the epoxy phenolic resin may be applied to the backing material by spraying, brushing, or by means of a roller. One or more layers of mica flakes or paper may be applied with intermediate coatings of the resin-bonding agent. A final coating of the resin-bonding agent may be applied followed by a final layer of glass cloth. An intermediate layer or layers of glass cloth may be used. A single conductor or a stack of conductors may be wrapped with the mica tape or sheet e.g. a copper conductor may be wrapped with a layer of the tape or sheet half lap wound, stocked with similar conductors, the stack wrapped with twelve layers of the tape or sheet, half lap wound, placed in an autoclave which is evacuated, the tape then impregnated with a suitable resin e.g. an epoxy or polyester resin, or the tape or sheet may have been impregnated with a suitable resin e.g. a mixture of bisphenol A epoxy resin and one or more cycloaliphatic resins as disclosed in Specification 1,169,691, the vacuum replaced by positive pressure, formed to the desired size in a jig, and finally heated in an oven to cure the resin bonding agent and the impregnating resin. Alternatively, the wrapped conductor may be removed from the autoclave, compressed in a suitable press to the desired size, and then heated in an oven.

Determination of Traces of Constituents with Schiff Bases. III. Extraction-Spectrophotometric Determination of Nickel with Salicylidene-o-aminophenol

Abstract: A method was established for the spectrophotometric determination of microgram amounts of nickel after the extraction of nickel(II) as a salicylidene-o-aminophenol (SAP) complex from an alkaline aqueous solution into chloroform. Nickel(II) reacts with SAP to form a complex which can be extracted into organic solvents such as benzene, chloroform, methyl isobutyl ketone, etc., in the presence of ammonium ions. The extraction of nickel was almost quantitative, and a maximum and constant absorbance was obtained in the pH range from 8.5 to 9.8. The complex extracted was very stable and had an absorption maximum at 418 mμ. The composition of the complex was confirmed to be 1 to 1 (metal to ligand). A linear relationship was maintained between the concentration of nickel and the absorbance. The molar extinction coefficient and the sensitivity for log(I0⁄I)=0.001 at 418 mμ were 17000 and 3.5×10−3 μg Ni/cm2, respectively. Several ions such as cobalt(II), copper(I and II), chromium(III), lead(II), manganese-(II) an...

Preparation of matte surfaces on alkenyl aromatic films

Abstract: 1,145,595. Matt surfaced films. DOW CHEMICAL CO. 24 Jan., 1967, No. 3498/67. Heading B5B. [Also in Division B6] A matt-surfaced, ink-receptive alkenyl aromatic resin film having an ink-receptive resinous polymeric material intimately incorporated in the surface, is prepared by treating the surface of the film with a mixture comprising the inkreceptive resinous polymer dispersed in a volatile organic liquid medium which is a swelling agent for the film, and then subsequently removing the volatile medium. The alkenyl aromatic film is preferably orientated polystyrene, 0A5 to 10 mils. thick; the swelling agent, e.g. acetone, methyl isobutyl ketone or methyl ethyl ketone, should have a boiling point between 40‹ and 135‹ C., and may form part of a solvent mixture. The other components being substantially inert diluents. (Exemplified is a mixture of 2 parts by volume of ethanol, 1 part butanol, 1 part methyl ethyl ketone, 1 part ethyl acetate, 2 parts toluene.) The ink-receptive polymer may be, e.g. vinylidene chloride-acrylonitrile copolymer, nitrocellulose, polyvinyl acetal, or an aromatic polyester, and is incorporated in the treating medium in 0A1 to 2A0% proportions by weight of the medium. An alkali metal salt of a sulphonated alkenyl aromatic resin may also be incorporated in the treating medium to remove static charge from the film. Contact temperature of film with treating medium is between 0‹ and 60‹ C.

A Solvent-extraction and Spectrophotometric Study of Copper(II) Complexes in Organic Solvents Containing Acetylacetone and Thenoyltrifluoroacetone

Abstract: The complex-formation equilibria of copper(II) in chloroform, benzene, or methyl isobutyl ketone (MIBK) containing both acetylacetone (AA) and thenoyltrifluoroacetone (TTA) have been determined by means of a liquid-liquid distribution method and a spectrophotometric method. The extraction constants or the extinction coefficients of the pure complexes were first determined in solutions containing only one of the liquids, and then these constants for the mixed complex and the equilibrium constants among the three complexes in these solvents were determined by the analysis of the results obtained from the experiments in mixed-ligand solutions. From these data, the following conclusions were reached. The constants experimentally obtained are almost identical with those statistically expected. The absorption spectrum of the mixed complex isolated from the absorption of the mixed-ligand system by the statistical analysis is more similar to that of the TTA complex than to that of the AA complex. The results obta...

Spectrophotometric determination of molybdenum(vi) with benzoylacetanilide

Abstract: The complex formed between molybdenum(VI) and benzoylacetanilide in the pH range 0.6 and 1.9 has been extracted into methyl isobutyl ketone and the absorbance has been measured at 410 mμ. Quantities of 0.15 to 2.10 mg of molybdenum have been determined with a standard deviation of 0.6%. The color is stable up to 2 hours. The presence of Co2+, Ni2+, Zn2+, Mn2+, Be2+, Al3+, Cr3+, Ce4+, Th4+ or UO2+ 2 up to 100 μg causes no interference. Ordinarily, Fe3+ interferes with the determination, but when masked with 1 ml of 0.5% solution of ascorbic acid the tolerance limit is 10 mg. Thus, molybdenum can be determined in steel when present in amounts as low as 0.26%.

Manufacture of polymers from polyisocyanates and poly-tert-alkyl urethanes

Abstract: 1,140,534 Polymers from polyisocyanates and poly-tert-alkyl urethanes IMPERIAL CHEMICAL INDUSTRIES Ltd 19 May, 1966 [1 June, 1965], No 23355/65 Heading C3R [Also in Division B2] Polymers are prepared by reacting at 100‹ to 200‹ C an organic polyisocyanate or phenol adduct thereof with a compound containing at least two groups of the general formula wherein R 1 and R 2 are hydrogen or hydrocarbon radicals and R 3 and R 4 are hydrocarbon radicals, which latter compounds may have been prepared by reacting a tertiary alcohol of the formula with a substantially stoichiometric amount of a compound containing at least two isocyanate groups The poly-tert-alkyl urethanes may be prepared by reacting such tertiary alcohols as t-amyl alcohol, t-butanol, methyl diethyl carbinol, dimethyl ethyl carbinol, dimethyl isopropyl carbinol, dimethyl n-propyl carbinol, triethyl carbinol, methyl ethyl n-propyl carbinol, methyl ethyl isopropyl carbinol, diethyl isopropyl carbinol, dimethyl n-hexyl carbinol, methyl-diisoamyl carbinol, dimethyl phenyl carbinol, methyl ethyl phenyl carbinol, methyl cyclopropyl phenyl carbinol and dimethyl cyclohexyl carbinol with conventional diisocyanates and polyisocyanates including isocyanate-ended reaction products of diisocyanates with aliphatic polyhydroxy compounds The organic polyisocyanates or phenol adducts thereof used to react with the poly-tert-alkyl urethanes may be any of the above mentioned polyisocyanates and in addition uretedione dimers, isocyanurate polymers of diisocyanates, biuret polyisocyanates and polyurethane prepolymers prepared by reacting excess polyisocyanate with a polymeric hydroxyl containing polymer such as a polyester, polyesteramide or polyether Phenol, o-, m- and p-cresols and xylenols may be used to " mask the polyisocyanates if desired The reaction between the organic polyisocyanate and the poly-tert-alkyl urethane is suitably carried out on a substrate, wherein the reactants are dissolved simultaneously or separately in an inert organic solvent such as ethyl acetate, butyl acetate, 2-ethoxy-ethyl acetate, methyl ethyl ketone, methyl isobutyl ketone, toluene or xylene, applied to a substrate and after drying until all the solvent has evaporated, the coated article is heated at 100‹ to 200‹ C to bring about the reaction

Studies on Determination of Cadmium by Atomic Absorption Spectroscopy Using a APDC-MIBK Extraction System

Abstract: A method for the atomic absorption spectroscopic determination of cadmium extracted with the APDC (ammonium pyrrolidinedithiocarbamate)-MIBA (methyl isobutyl ketone) is described. We examined various condition of the extraction of cadmium and of the atomic absorption analysis.Cadmium was efficiently extracted from the aqueous solution adjusted to the pH 3.5-10.3 range and to the salt concentration over 2.5M with saturated ammonium sulfate solution. Under these conditions, cadmium in 25ml of the aqueous solution was completely extracted with 10ml of MIBK by a single extraction. When the aqueous solution increased to 50ml, the extractability was still 97 per cent.The presence of a large amount of zinc, lead and mangane decreased the absorbance of cadmium owing to the poor solubililties of APDC-chelates in MIBK.