Showing papers on "Methyl isobutyl ketone published in 1984"

Extraction of metals from sea water

Abstract: Synthese des etudes publiees sur l'extraction des differents metaux de l'eau de mer avec une attention particuliere au cas de l'uranium

Preparation of natural antioxidant

Abstract: PURPOSE:To prepare a natural oxidant from tea leaves with a good yield, by extracting tea leaves with a specified solvent, washing the extract with chloroform and dissolving the extract in an organic solvent, followed by removal of the solvent and drying. CONSTITUTION:Tea leaves are extracted with one solvent selected from among hot water, 40-75% aqueous soln. of methanol, 40-75% aqueous soln. of ethanol and 30-80% aqueous soln. of acetone. The soln. which contains the extract is washed with chloroform and is dissolved in an organic solvent. Then the organic solvent is removed by distillation and the extract is dried. The tea leaves are e.g., raw tea leaves, non-fermented tea, semi-fermented tea, green tea and instant green tea. Hot water for extraction should be at 80 deg.C or higher. Preferred organic solvents are ethyl acetate, n-butanol, methyl isobutyl ketone, acetone, etc.

Evaluation of Nonaqueous Solvent Systems for Countercurrent Chromatography Using an HPLC Assay to Determine Partition Coefficients of a Mixture of Compounds

Abstract: A reversed phase HPLC assay was used to measure partition coefficients for salicylic acid, salicylamide and salicyluric acid in two-phase systems employing neat or aqueous ethylene glycol, formamide, or methanol and the organic solvents: ethylene dichloride, ethyl acetate, diethyl ether and methyl isobutyl ketone. These solvent systems permit preparative separation by countercurrent chromatography of compounds with limited aqueous solubility. Salicylic acid, salicylamide and salicyluric acid are readily separated in the system employing ethylene glycol as the stationary phase and diethyl ether as the mobile phase.

The range of light ions in polymeric resists

Abstract: The technique of ion beam lithography coupled with calculations using a Monte Carlo computer program for ion penetration in solids have been used to obtain various range parameters of hydrogen, helium, lithium, beryllium, boron, and carbon ions in polymethyl methacrylate resist. In the experiment, the resist is bombarded with ions and then developed in a 1 : 1 solution of methyl isobutyl ketone and isopropyl alcohol with the developed depth monitored as a function of time. The saturated developed depth is approximated as the mean path length of the ion in the resist. The physical basis of this approximation is discussed. The projected ranges and straggles of the specified ions at energies of 5–300 keV obtained by fitting the experimental data to the total range using a Monte Carlo program are presented. These range data can be used as guidelines to determine the resist mask thickness for ion implantation and for choosing resist thickness in ion beam lithography.

An HPLC method for measuring 5-fluorouracil in plasma

Abstract: 5-Fluorouracil in plasma was determined by extraction with methyl isobutyl ketone, evaporation of the ketone, and reverse phase high performance liquid chromatography of the evaporation residue. With UV detection at 280 nm the lower limit of detection is 10.0 ng/ml and interfering peaks eliminated. The method is highly reproducible.

Determination of Bismuth in Eighty‐Three Geochemical Reference Samples by Atomic Absorption Spectrometry

Abstract: The silver content of seventy-three geochemical reference samples has been determined by atomic absorption spectrometry using an air-acetylene flame or a graphite furnace atomizer, after extraction of silver as iodide with methyl isobutyl ketone (MIBK). A comparison with published data shows clearly the need for much more data on most reference samples.

Determination of microgram amounts of selenium and tellurium in copper-base alloys by atomic absorption spectrometry

Abstract: Trace amounts of selenium and tellurium in copper-base alloys are determined by atomic absorption spectroscopy. The alloys are dissolved in nitric acid to yield selenious and tellurous acids which are readily reduced to elemental form. Iodide complexes of both selenium and tellurium are extracted simultaneously using a solution of trioctylphosphine oxide and methyl isobutyl ketone. Selenium and tellurium are determined by flame atomic absorption with a sensitivity of 0.0002%. 6 references, 2 tables.

Production of polydihydrogensiloxane

Abstract: PURPOSE:To obtain a silane-terminated polydihydrogensiloxane without gelation, etc., by dissloving a dialkoxysilane in hydrous methyl isobutyl ketone, hydrolyzing it, and effecting the polycondensation of the hydrolyzate by dehydration in vacuum. CONSTITUTION:A dialkoxysilane of the formula: H2Si(OR)2 (wherein R is a monovalent lower alkyl) is dissolved in methyl isobutyl ketone containing water in an amount in the range not to cause separation between water and organic phases. A steam-containing inert gas is bubbled into the solution to hydrolyze the silane, and the hydrolyzate is polycondensed by dehydration in vacuum to obtain the purpose silanol-terminated poly(dihydrogensiloxane). In this way, it becomes possible to control the reaction rate of the hydrolysis, to effect the hydrolysis and polycondensation of a dialkoxysilane without three-dimensional crosslinking and to obtain poly(dihydrogensiloxane) suitable for insulation films of semiconductor devices.

Production of carbonyl compound

Abstract: PURPOSE:To easily, stably obtain in high yield a carbonyl compound useful as a solvent or chemical feedstock by reacting an olefin with an oxidative gas under specified conditions. CONSTITUTION:An olefin is reacted with an oxidative gas in the presence of a palladium compound (e.g. PdSO4.2H2O), polyoxoanionic compound [e.g. (PV3Mo9O40) ] and iron-contg. compound [e.g. Fe2(SO4)3] in a solvent consisting of at least one kind of compound selected from oxygen-contg. compounds (e.g. 1,4-dioxane) and sulfur-contg. compounds (e.g. dimethylsulfoxide) or a mixed solvent compound of the compound (s) and water to obtain the objective carbonyl compound useful as a solve or chemical feedstock such as methyl ethyl ketone, methyl isobutyl ketone, acetone, cyclopentanone or cyclohexanone, or as a precursor for higher alcohols such as a ketone or aldehyde. For this reaction, catalytic activity deterioration can be prevented and reaction rate can be maintained stably at high levels without the need for separating reaction process from catalyst regeneration process.

Preparation of aromatic carbonyl compound

Abstract: PURPOSE:To obtain an aromatic carbonyl compound efficiently in remarkably high yield, by decomposing a hydroperoxide in the presence of an aqueous layer containing an iron salt, a copper salt and an acid in an atmosphere of an inert gas. CONSTITUTION:A hydroperoxide of formula I [R1 and R2 are H or CH3; R3 and R4 are H, alkyl, -C(CH3)2OH, -COCH3 or COOH, etc.] or formula II is decomposed to give an aromatic carbonyl compound of formula III or IV. In the process, the decomposition reaction is carried out in the presence of an aqueous layer containing an iron salt, copper salt (preferably both being sulfates) and an acid in a solution of the above-mentioned hydroperoxide in an organic solvent, e.g. methyl isobutyl ketone, to give the aimed aromatic carbonyl compound. The molar amounts of the salts are preferably as follows; 0.001-1mol, based on 1mol hydroperoxide group in the hydroperoxide, iron salt and 0.01-4mol, based on 1mol iron salt, copper salt. The amount of the aqueous layer containing the iron salt, copper salt and acid is preferably 10pts.wt. or more based on 100pts.wt. organic solvent layer containing the hydroperoxide.

Indirect determination of thiocyanate ion by atomic absorption spectrophotometry

Abstract: A new indirect atomic absorption spectrophotometric method for the determination of thiocyanate ion in water is proposed. The method is based on the extraction of the ion-pairs formed between thiocyanate ion and thiourea-copper(I) complex with methyl isobutyl ketone. Under the optimum conditions established, thiocyanate ion ranging from 0.04 μg/ml to 2 μg/ml in water could be determined. The method was applied to the determination of thiocyanate ion in human saliva.

Production of polyamic acid

Abstract: PURPOSE:To obtain cheaply a polyamic acid which, when ring-closed, can form a polyimide excellent in heat resistance, mechanical strength, abrasion resistance, and flexibility, by reacting a tetracarboxylic dianhydride with a diamine in a mixture of a specified organic solvent and an aproptic solvent. CONSTITUTION:A tetracarboxylic dianhydride is reacted with a diamine in a mixture of (a) at least one organic solvent selected from the group consisting of diacetone alcohol Cellosolve, methyl isobutyl ketone, phenol, cresol, and xylenol, and (b) an aproptic polar solvent. The reaction is carried out preferably at a temperature 50 deg.C, the imidation proceeds to an excessive degree, and the formed water not only prevents the increase in molecular weight but also adversely affects the storage stability of the varnish. The polyamic acid produced is converted by ring closure into a polyimide either by heating it to a temperature >=100 deg.C or treating it with a dehydrating agent.

Viscosity–temperature relationships for dilute solutions of poly(cyclohexyl methacrylate) in methyl isobutyl ketone

Abstract: Utilisation de l'equation de Guzman-Andrade pour etudier le comportement de ce polymere entre 283 et 313°K

Process for direct conversion of diacetone alcohol to methyl isobutyl ketone

Abstract: PURPOSE: To obtain the titled compound easily in high yield, in two steps, without using complicate procedure, by contacting liquid diacetone alcohol with hydrogen gas in the presence of an acid catalyst and a reduction catalyst. CONSTITUTION: The titled compound can be produced by contacting liquid diacetone alcohol with hydrogen gas in the presence of an acid catalyst and a reduction catalyst. The reaction temperature is 40W200°C, preferably 60W150°C, and the reaction pressure is 1W50kg/cm 2 G, preferably 2W20kg/cm 2 G. The reaction can be carried out either by batch process or by passing the reaction mixture through a fixed bed. The acid catalyst is preferably a solid acid such as HY-type zeolite or a strongly acidic ion exchange resin such as Amberlyst-15, etc. The reduction catalyst is especially a noble metal catalyst such as Pd and/ or Pt. The ratio of the acid catalyst to the reduction catalyst is arbitrary. COPYRIGHT: (C)1986,JPO&Japio

Process for drying polymeric beads and associating shading pigments therewith

Abstract: A process for drying a water-wet paste containing polymeric beads without agglomeration is disclosed in which there is added to the wet paste a proportion of an organic solvent which forms an azeotrope with water, such as methyl isobutyl ketone, in an amount providing a stirrable mixture, and the solvent-containing aqueous paste is heated to remove the water as an azeotrope with the solvent and to produce a water free suspension of the beads in organic solvent. The proportion of azeotropic solvent can be minimized by adding a resinous vehicle in organic solvent solution to the solvent-containing aqueous paste after substantially all the water has been removed, and continuing the application of heat to remove undesired organic solvent and thereby increase the solids content. As a feature of the invention, a pigment which is incompatible with the azeotropic solvent, such as an aqueous dispersion of lamp black, is added to the aqueous paste either before or after the addition of azeotropic organic solvent to be present while the water is azeotropically removed to avoid flooding.

New Mercapto Esters as Intermediates for PVC Stabilizers

Abstract: The recent introduction of antimony mercaptides as PVC heat stabilizers is most timely in view of recent developments in the PVC field.

Continuous production of diacetone alcohol

Abstract: PURPOSE: To prolong the catalytic life and to improve the yield of the titled compound useful as a raw material of methyl isobutyl ketone by contacting acetone with a strongly basic ion exchange resin, by introducing water together with acetone at a specific ratio into the reactor. CONSTITUTION: Liquid acetone is made to contact with a strongly basic ion exchange resin to effect the condensation of acetone. In the above process, water is introduced together with acetone into the reactor. The amount of water is preferably 1W10(wt)%, especially 2W6% based on acetone, and the reaction is carried out at 0W30°C, preferably 5W20°C. The amount of the reaction liquid is preferably 0.1W20Hr -1 in terms of liquid hour space velocity (LHSV) based on the resin catalyst. Any strongly basic ion exchange resin can be used in the above process provided that it is an OH-type resin having styrene as the base polymer and having quaternary ammonium group as the ion exchange group. COPYRIGHT: (C)1986,JPO&Japio

Patterning method of negative resist

Abstract: PURPOSE:To obtain a titled pattern having a high resolving characteristic and excellent resistance to dry etching by irradiating a high energy beam to a film formed by quinonediazide ester of oligomer having a specific degree of polymn. and developing said film. CONSTITUTION:Benzoquinonediazide ester or naphthoquinonediazide ester of an oligomer having 1-20 degree of polymn. (e.g., a novolak resin having >=2,000 mol.wt.) is dissolved in a solvent such as methyl cellosolve acetate or the like and the soln. is coated on a substrate such as a silicon substrate or the like to form the film of a negative type resist. A high energy beam such as an electron ray or X-ray is selectively irradiated and thereafter the film is developed by a soln. contg. acetic ester (e.g. ethyl acetate or isopropyl acetate) or alkyl ketone (e.g. methyl isobutyl ketone), by which the intended fine negative resist pattern is formed.

High quality solvent blend for acryl resin synthesis for coating solid content

Abstract: An improved method for providing acrylic copolymer resins is provided in which the polymerization solvent comprises a blend of methyl isobutyl ketone and alkyl-substituted benzenes … The monomers comprise hydroxy-substituted alkyl (meth)acrylate monomers and non-hydroxy substituted alkyl (meth)acrylate monomers, and the process provides an improved method for forming low molecular weight acrylic resins useful as components in acrylic coatings The polymerization solvent can remain in the resin to become a solvent employed in the higher solids coating containing the thus-formed acrylic resins and provides improved electrical resistivity, improved solvency and decreased surface tensions over prior art polymerization solvents