KR950005797A - Improved manufacturing method of unsaturated carboxylic acid esters and its new manufacturing apparatus (process) - Google Patents

Abstract

The present invention relates to a method of continuously producing corresponding unsaturated carboxylic acid esters by using a cation exchange resin as a catalyst in an esterification reaction of an aliphatic alcohol having 1 to 8 carbon atoms with an unsaturated carboxylic acid. In the form of a fixed bed separated into stages, each stage is composed of a catalyst layer, a filter, and an air inlet, and an outer wall of the reactor is adiabatic, and the reactants circulate in contact with the catalyst layer continuously from the top to the bottom. Through the circulating pump and circulating the reactant between the reactor and the heat exchanger, and azeotropic composition of water and alcohol vaporized by the heat exchanger in contact with the reflux of the column column or the raw alcohol supplied from the column top column The point component is fed back into the reactor and the lighter component moves to the top of the column Is liquefied in the condenser air after the organic layer was washed with water and the organic layer separated in the decanter is refluxed be generated, to a method which is characterized by producing through the reaction process and apparatus are removed.

Description

Improved manufacturing method of unsaturated carboxylic acid esters and its new manufacturing apparatus (process)

Since this is an open matter, no full text was included.

Claims (8)

In the method of continuously producing the corresponding unsaturated carboxylic acid esters by using a cation exchange resin as a catalyst in the esterification reaction of an aliphatic alcohol having 1 to 8 carbon atoms with an unsaturated carboxylic acid, it is separated into 1 to 10 steps. It consists of a fixed bed, each stage is composed of a catalyst bed, a filter, an air inlet, and the outer wall is circulated through the reactor insulated from the top to the bottom continuously in contact with the catalyst bed and the heat of vaporization for the extraction of product water is supplied through a heat exchanger outside the reactor. The circulating pump circulates the reactants between the reactor and the heat exchanger, and the azeotropic composition of water and alcohol vaporized by the heat exchanger is brought into contact with the reflux of the column column or with the raw alcohol supplied from the column top column alcohol supply port. Reflux to the reactor and light components are transferred to the top of the column to condense Liquid and the organic layer after the organic layer with water and remove it from the decanter was refluxed to create and method characterized in that it produced through the reaction process are removed from the. The method of claim 1 wherein the unsaturated carboxylic acid is acrylic acid, methacrylic acid. The method of claim 1 wherein the molar ratio of unsaturated carboxylic acid to alcohol is about 1:08 to 1: 1.3. The method of claim 1 wherein the reaction temperature is about 70-100 ° C. ambient temperature. The method of claim 1 wherein the reaction pressure is about 50-400 torr. The method of claim 1, wherein the polymerization inhibitor is used in the phenolic form of about 100 to 500 ppm. The method of claim 1 wherein the alcohol provided for reflux is at least 10% by weight of the amount of alcohol supplied to the esterification reaction. In continuously producing the corresponding unsaturated carboxylic acid esters by using a cation exchange resin as a catalyst in the esterification reaction of an aliphatic alcohol having 1 to 8 carbon atoms with an unsaturated carboxylic acid, the reactor 22 is 1 to 10 In the form of a fixed bed separated into stages, each stage is a catalyst bed, a filter, and an air inlet port, and the outer wall is circulated through the reactor which is adiabatic by contacting the catalyst layer continuously from the top to the bottom, and heat of vaporization for extraction of generated water is exchanged outside the reactor. From the alcohol supply 23 of the alcohol or column detective of the column or reflux in the column column and the azeotrope of the water and alcohol vaporized by the heat exchanger and the reaction product is circulated between the reactor and the heat exchanger with a circulation pump In contact with the feed alcohol, the high boiling point component is fed back into the reactor and the lighter component A reaction process particularly suitable for the present invention, wherein the organic layer is refluxed and product water is removed after being moved to liquefy in a condenser and separated into organic and water in decanters 18, and a new manufacturing apparatus specially designed accordingly. ※ Note: The disclosure is based on the initial application.