Mitsubishi Chemical Industries Limited

Mitsubishi Chemical Corporation

Yasuo Tanabe

Jun Toriya

Ken Shiraga

Masato Sato

Ikuo Kasahara

Naoshi Imaki

Hidehiko Ohara

Koshi Sasaki

Minoru Tamura

A process for producing a surface-modified molded product of synthetic resin, which comprises contacting a fluorine-containing gas to the surface of a molded product of synthetic resin and then contacting a polymerizable monomer to form a new polymer layer on the surface of the molded product.

Surface-modified molded product of synthetic resin and process for

A method for producing silicon which comprises subjecting silane and chlorine to a combustion reaction to generate a flame and thereby precipitating fine crystals of silicon.

Method for the production of silicon

A process is disclosed in which hydrolysis and cyclization of an acetate ester of a 1,4-diol are carried out in separate reaction zones in the pressure of a solid acid catalyst and unreacted acetate ester recovered from each of the reaction zones is supplied to another zone thereby producing a hydrofuran and a 1,4-diol in any proportion.

Process for producing a hydrofuran and a 1,4-diol

Disclosed is a method of recovering butadiene gas from an acetoxylation process which method comprises steps: (a) contacting a butadiene-containing gas with acetic acid to effect the absorption of butadiene in acetic acid, (b) recycling the acetic acid containing butadiene to the acetoxylation process, (c) contacting the waste gas containing acetic acid from step (a) with water to effect the absorption of acetic acid in water and (d) recycling the water containing acetic acid to hydrolysis step of the acetoxylation product.

Method of recovering butadiene gas from an acetoxylation process

A process for producing 1,4-glycol diester from unsaturated glycol diesters prepared by reacting butadiene, acetic acid and oxygen or an oxygen-containing gas in the presence of a palladium catalyst or, from saturated glycol diesters prepared by hydrogenating said unsaturated glycol diesters, wherein, 1,4-glycol diester is separated from the isomer mixture of glycol diesters prepared, the residual glycol diester isomers are decomposed by heating and butadiene and/or acetic acid produced on decomposition are recycled to the process for the production of glycol diesters.

Process for producing 1,4-glycol diester

This invention relates to an improved process for producing cyclic ether from an acetic acid ester of 1,4-glycol and water by cyclization reaction which is characterized by solidifying a high boiling by-product with or without a separation accelerator in the reaction residue, separating the solid obtained thereby from the residue of filtration and recycling a filtrate into the reaction zone.

Process for producing cyclic ether

A process for producing tetrahydrofuran or dihydrofuran from an acetic ester of 1,4-butanediol or 1,4-dihydroxybutene-2 is disclosed in which the raw material liquid acetic ester and steam are reacted in the presence of an acid catalyst in a plurality of reaction zones in liquid-gas countercurrent contact, a gaseous fraction containing the product cyclic ether is recycled to the preceding reaction zone while a liquid fraction containing unreacted raw material is transferred into the succeeding zone and the product cyclic ether is recovered from the gaseous fraction discharged from the first zone by distillation whereby the conversion of the acetic ester into the cyclic ether is improved.

Process for producing a cylic ether from an acetic ester of a 1,4-glycol

This invention relates to a process for preparing tetrahydrofuran or dihydrofuran by reacting an acetic acid ester of 1,4-butanediol or 1,4-dihydroxybutene-2 and water in the presence of an acid catalyst with a high yield. The process is characterized in that the reaction is carried out in two separate reaction zone in combination with a plurality of distilling columns and a part of reaction product is recycled to a predetermined position of the reaction zone.

Process for preparing cyclic ethers

In the process for preparing tetrahydrofuran by the dehydrocyclization of 1,4-butanediol in the presence of a non-volatile acid catalyst, wherein vapor mixture of water and tetrahydrofuran is continuously taken out from the reaction zone and subjected to the azeotropic distillation in three distillation columns operated under specified conditions thereby obtaining tetrahydrofuran of high quality in a high yield.

Process for preparing tetrahydrofuran

Diacetoxybutene is prepared by a catalytic reaction of butadiene, acetic acid and oxygen or an oxygen containing gas in the presence of a supported palladium catalyst. In said reaction, the use of butadiene containing vinylcyclohexene in an amount of not more than 5,000 parts by weight per million parts by weight of butadiene and at least one polymerization inhibitor prevents the lowering of the activity of the catalyst thereby prolonging its useful life.

Process for preparation of diacetoxybutene

Butanediol and/or butenediol are prepared by hydrolyzing diacetoxybutane and/or diacetoxybutene in the presence of a cation-exchange resin and recovered by fractional distillation. By the treatment of the hydrolyzed product with an anion exchange resin at any stage before the butanediol and/or butenediol are fractionated, butanediol and/or butenediol are recovered in high yield.

Growing community of inventors

Tokyo, Japan

Yasuo Tanabe