KR950005796A - 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 contacting the azeotropic composition of water and alcohol vaporized by the heat exchanger with the reflux in the column column, the high boiling point component is returned to the reactor and the light component is brought to the top of the column. Moved and liquefied in the condenser and separated into organic and water in decanters The base layer is the reflux is to create a method and apparatus characterized in that it produced through the reaction process is 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.

The figure is a schematic diagram showing an example of a reactor which is the main part for carrying out the method of the present invention.

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 alcohol refluxed in the column column so that the high boiling point component is returned to the reactor and the lighter component is moved to the top of the column to condense. Liquefied in and separated into organic and water in decanters Current is generated number is characterized in that the manufacturing process through the reaction is removed. 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 a phenolic form of about 100 to 500 (ppm). The method of claim 1, wherein the number of stages of the reaction water consists of three stages. In the continuous preparation of the corresponding unsaturated carboxylic acid esters using a cation exchange resin catalyst in the esterification reaction of an aliphatic alcohol having 1 to 8 carbon atoms with an unsaturated carboxylic acid, the reactor 22 has 1 to 10 stages. It is composed of a fixed bed separated into two, preferably consisting of three stages, each stage is a catalyst bed ⑵, filter 구, air inlet, the outer wall is adiabatic through the reactor in contact with the catalyst layer continuously from top to bottom circulating and extracting the product water The heat of vaporization is supplied through the heat exchanger outside the reactor, and the circulating pump circulates the reactant 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. The point component is returned to the reactor and the light component is moved to the top of the column to liquefy in the condenser and Reaction process particularly suitable for the present invention, wherein the organic layer is refluxed and the generated water is removed after separation into organic layer and water in 8), and a new manufacturing apparatus specially designed accordingly. ※ Note: The disclosure is based on the initial application.