Methyl acetate hydrolysis process and its equipment

Abstract

The present invention discloses a hydrolysis process of methyl acetate by using cation exchange resin as catalyst and its equipment. Said hydrolysis equipment is a cylindrical tower, its interior contains reactive rectification section and stripping section, the hydrolysis reaction is implemented in reactive rectification section, and the reactive rectification structure unit being in reaction zone organically combines the catalyst loading, liquid distributor, overflow pipe and vapour-liquid contact equipment together, its structure is compact and its equipment efficiency is high. Its hydrolysis process is as follows; making water and methyl acetate product hydrolysis in the reaction zone according to a certain proportion, and making non-reacted reactant pass through the condenser and condensed, then returning it back into reaction zone to further react. Its ester hydrolysis rate is 40%-99.8%.

Description

Technical field: [0001] The present invention relates to the reaction rectification technology of methyl acetate hydrolysis and used equipment, exactly, a kind of hydrolysis technology that uses cationic exchange resin as the methyl acetate of catalyst, and the equipment used for this technology. Background technique: [0002] In the production of polyvinyl alcohol (PVA), a large amount of methyl acetate is produced as a by-product. At present, most PVA manufacturers use cationic fixed bed hydrolysis process to decompose methyl acetate into methanol and acetic acid for recycling. The main disadvantage of fixed bed hydrolysis process is acetic acid The hydrolysis rate of methyl ester is low, and a large amount of unhydrolyzed methyl acetate needs to be recycled, resulting in huge equipment and high energy consumption. When the water-to-ester molar ratio of the reactants is 0.95-1.0, the general hydrolysis rate can only reach 23%-25%. At present, there are patents and literat...

AI Technical Summary

Problems solved by technology

The Chinese patent (ZL97101306.3) adopts the method of "bundling bag", puts the cation exchange resin into the corrosion-resistant cloth bag to make the catalyst packing, and then puts it into the tower for reaction, which solves the problem of catalyst particles falling off and losing, However, the manufacture of the catalyst package is still troublesome, and the replacement and activation of the catalyst is still inconvenient

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