Mitsubishi Rayon Company, Limited

Toshihiro Sato

Masao Kobayashi

Kazutaka Inoue

Akira Ogawa

Motomu Oh-Kita

Haruki Sato

Yasuhiro Kabu

Seigo Watanabe

Shigeho Tanaka

Tohru Endoh

Tomomichi Hino

Shigetoshi Shimauchi

Disclosed is a method for synthesizing t-butyl (meth)acrylate at low cost. Specifically, disclosed is a method for synthesizing a carboxylic acid ester by performing an addition reaction between isobutylene and (meth)acrylic acid in the presence of an acidic catalyst. This method includes the steps of:

Method for synthesizing t-butyl (meth)Acrylate

A vertical multitubular heat exchanger that can prevent clogging of a polymerized material and is continuously operable for an extended period of time is provided. The vertical multitubular heat exchanger () of the present invention introduces a process fluid containing an easily-polymerizable substance into heat exchanger tubes () to perform heat exchange. The vertical multitubular heat exchanger () includes a shell () extending in a vertical direction, an upper tube sheet () and a lower tube sheet () respectively disposed at the upper portion () and the lower portion () of the shell (), and a plurality of heat exchanger tubes () whose outer circumferences () of both ends are respectively fixed to the upper tube sheet () and the lower tube sheet (). An upper surface () of the upper tube sheet () is formed to be sloped and at least one of the heat exchanger tubes () is disposed in the vicinity of the lowest position of the upper surface () of the upper tube sheet ().

Vertical multitubular heat exchanger and distillation column system including the same

A method for producing (meth)acrolein and/or (meth)acrylic acid by subjecting isobutylene and the like or propylene to a vapor-phase catalytic oxidation with molecular oxygen in the presence of a solid oxidation catalyst in a tubular type of fixed bed reactor, wherein a temperature of a hot-spot zone is sufficiently controlled and (meth)acrolein and (meth)acrylic acid are produced with a high yield. A method for producing (meth)acrolein and/or (meth)acrylic acid by passing a raw material gas comprising isobutylene and the like or propylene and oxygen through a catalyst layer in a tubular type of fixed bed reactor which is filled with a solid oxidation catalyst, which includes passing a gas containing isobutylene and the like or propylene in a concentration lower than that of the raw material gas, and oxygen through the catalyst layer for a period of one hour or more prior to passing the raw material gas through the catalyst layer.

Process for producing (meth)acrolein and/or (meth)acrylic acid

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 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:

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Otake, Japan

Toshihiro Sato