Method for preparing sec-butyl acetate

Abstract

A preparation method of secondary butyl acetate applies the method of catalytic distillation to enable acetic acid and mixed C4 (or butylene) to respectively enter into a catalytic distillation column from the upper rectifying section and the lower stripping section of the tower, a catalyzer is loaded in a reaction section, the acetic acid is countercurrent contacted with the mixed C4 (or butylene) on the surface of the catalyzer, the unreacted mixed C4 (or butylene) is evaporated from the top of the column, and a product mixture flows out from the bottom of the column. By applying the method to prepare the secondary butyl acetate, in the follow-up working procedure of separation, a flash column which is used to remove the unreacted mixed C4 (or butylene) is not needed, as a result, the separation technique of products is simplified, and energy consumption is reduced.

Description

technical field [0001] The present invention relates to a kind of preparation method of sec-butyl acetate, particularly relate to a kind of method that adopts catalytic distillation technology to prepare sec-butyl acetate. Background technique [0002] Currently, using acetic acid and mixing C 4 (or butene) as raw material, the method for preparing sec-butyl acetate usually obtains by carrying out esterification in a tubular fixed-bed reactor. U.S. Patent No. 5,457,228 discloses a kind of method for preparing sec-butyl acetate, is that reaction material is acetic acid and mixing C 4 (or butene) is introduced from the upper part of the tubular fixed-bed reactor, and the product mixture includes unreacted mixture C 4 (or butene), unreacted acetic acid and product sec-butyl acetate flow out from the bottom of the reactor simultaneously. After the product mixture passes through the circulating pump and heat exchanger in sequence, a part of the product mixture is sent to the s...

AI Technical Summary

Problems solved by technology

The deficiency of this method is: (1) adopt shell-and-tube fixed bed to make reactor, send that part product mixture of separation generally need to pass through flash tower first, unreacted mixed C 4 (or butene) is removed from the product mixture, thus increasing the difficulty of the subsequent product separation process

Moreover, the temperature and pressure of the flash tower are high, and the energy consumption is high; (2) the reaction material is circulated into the reactor, which increases the polymerization tendency of olefins and affects the product purification; (3) the use of circulating pumps and heat exchangers increases energy consumption. consumption