Mitsubishi Rayon Company, Limited

Masao Kobayashi

Hideo Matsuzawa

Hiromichi Ishii

Masaaki Kato

Kazuhiro Ishii

Kantaro Yamada

Motomu Oh-Kita

Kazuya Okada

Toshihiro Sato

Tetsuya Uno

Kazutaka Inoue

Naoto Osuga

Naoki Yamamoto

Nobuhiro Mukai

Hitoshi Ige

Yoshiyuki Taniguchi

Junko Atarashi

Masato Otani

Teruhiko Yoshioka

Hiroshi Sonobe

Masaki Kato

Kouhei Okamura

In accordance with the present invention, there is provided a process for the production of deuterated acrylic acid or deuterated methacrylic acid comprising the exchange of hydrogens in acrylic acid or methacrylic acid with deuteriums in the presence of a catalyst. The deuterated acrylic or methacrylic acid is very useful as a starting material in the production of high quality optical plastic fibers.

Process for the production of deuterated acid or deuterated methacrylic

4-Hydroxybutyl (meth)acrylate is prepared by reacting (meth)acrylic acid with 1,4-butanediol in the presence of an acidic catalyst. 1,4-Butanediol di(meth)acrylate is added at the beginning of the reaction and the ratios of the butanediol to the acid and of the ester to the acid are kept within specified ranges during the course of the reaction.

Method for producing 4-hydroxybutyl (meth)acrylate

A material for dentistry having a low odor, a low stimulation and a proper dough stage time is here disclosed which is prepared by blending a monomer selected from the group consisting of (meth)acrylate compounds represented by the general formula ##STR1## R.sub.1 is a hydrogen atom or a methyl group, each of R.sub.3, R.sub.6 and R.sub.10 is an alkyl group, and each of R.sub.2, R.sub.5, R.sub.8 and R.sub.9 is an alkylene group) and (meth)acrylate dimers.

Material for dentistry

A process for purifying methyl methacrylate which comprises treating methyl methacrylate having a purity of 99.5% or more containing a trace of impurities with a sulfonic acid group-containing compounds. According to the present invention, there can be obtained highly purified methyl methacrylate which exhibits an absorbance of 0.02 or less in a range of wavelength of 400-500 nm according to the sulfuric acid color method and is free of even a trace of furan-type compounds.

Process for purifying methyl methacrylate

The gas phase catalytic oxidation of an unsaturated aldehyde with molecular oxygen at 200.degree. to 500.degree. C. to give the corresponding unsaturated carboxylic acid is conducted in the presence of a catalyst represented by the following formula:

Process for the preparation of unsaturated carboxylic acids

The present invention provides a process for the preparation of a catalyst used in the production of unsaturated carboxylic acids such as methacrylic acid by the gas phase catalytic oxidation of the corresponding unsaturated aldehydes such as methacrolein. Said catalyst is composed of a multi-component composition containing at least phosphorus, molybdenum and antimony. The present invention has attained an improved in its catalytic performance such as conversion rate, selectivity, single-pass yield etc. by using antimony trioxide with average particle size of no more than 0.2 micron as a starting material upon preparing said catalyst.

Process for the preparation of catalyst used in the production of

There is provided the improved process for the production of deutrated methyl acrylate or methacrylate by the direct substitution of deuterium for hydrogens in methyl acrylate or methacrylate in the presence of a platinum Group metal catalyst.

Process for the production of deuterated methyl acrylate or deuterated

A process for production of isobutylene by dehydration reaction of t-butyl alcohol or its aqueous solution is provided wherein the dehydration reaction is carried out in gaseous phase on fixed-bed type silica-alumina catalyst with adding non-reactive gas and/or water vapor to feed gas or reaction gas and/or with diluting at least a part of the catalyst with a carrier.

Process for producing isobutylene

A process for producing methacrylic acid which comprises reacting methacrylic acid and isobutylene in the presence of a sulfonic acid group-containing ion exchange resin by a continuous process while controlling the reaction at a reaction temperature of -20.degree. C. to +20.degree. C. so as to fulfil the following relation:

Process for producing tau-butyl methacrylate

The present invention provides a process for the production of methacrolein and methacrylic acid by the gas phase catalytic oxidation of isobutylene or t-butanol at high temperature using molecular oxygen in the presence of catalyst consisting of molybdenum, tungsten, bismuth, iron, nickel, antimony, and an alkali metal, to which zinc or lead is added, and further phosphorus sulfur, silicon, selenium, germanium or boron, and magnesium, cobalt, manganese or tin are added.

Process for the production of methacrolein and methacrylic acid

Process for the production of methacrylic acid

A method for regenerating a spent oxidation catalyst useful in the production of unsaturated carboxylic acids by vapor-phase oxidation of unsaturated aldehydes, the catalyst containing, at least, phosphorus, molybdenum, and an alkali metal(s), which method comprises dissolving and/or suspending the spent catalyst in a liquid composition, wherein the contents of ammonium ion and nitrate ion are controlled to be from 7 to 15 moles and from 0.1 to 4.0 moles, respectively, per 12 gram atoms of molybdenum, and immediately thereafter mixing the spent catalyst and the liquid composition.

Method for regenerating phosphorus-molybdenum-alkali containing

At least one olefinic hydrocarbon of 3 to 4 carbon atoms is oxidized catalytically in the gas phase in the presence of molecular oxygen at 200.degree.-450.degree. C. to produce the corresponding aldehyde and acid over a calcined catalyst of the formula Mo.sub.a Sb.sub.b Bi.sub.c Fe.sub.d Ni.sub.e Sn.sub.f X.sub.g Y.sub.h O.sub.i wherein X is at least one alkali metal selected from the group consisting of potassium, rubidium and cesium; Y is at least one metal selected from the group consisting of cobalt, uranium, germanium, tungsten and titanium; a to h are atomic ratios wherein a=12, b=0.2 to 20, c=0.2 to 12, d=0.2 to 12, e=0.2 to 12, f=0 to 20, g=0.01 to 4 and h=0 to 6; and i is determined according to the oxidation states of the metal atoms in the catalyst.

Process for producing unsaturated aldehydes, and unsaturated fatty acids

The gas phase catalytic oxidation of an unsaturated aldehyde with molecular oxygen at 240.degree. to 450.degree. C. to give the corresponding unsaturated carboxylic acid is conducted in the presence of a catalyst of the following formula:

Catalytic process for the preparation of unsaturated carboxylic acid

An olefin having 4 carbon atoms or t-butyl alcohol is catalytically oxidized in the gas phase with molecular oxygen at 200.degree. to 450.degree. C. to give the corresponding unsaturated aldehyde, unsaturated carboxylic acid and/or conjugated diene in the presence of a catalyst having the formula:

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Otake, Japan

Masao Kobayashi