Preparation method for sec-butyl acetate with product separating technique

Abstract

The invention relates to a process for preparing sec-butyl acetate, with product separation technology, which is characterized in that the reaction is processed in one catalysis distillation column composed of a column reactor, an exhausting section, a reaction section, a distillation section, and a column top reflux condenser, wherein the reaction section is filled with catalyst, acetic acid andmixture C4 or butene which are reversely contacted and reacted on the surface of catalyst, the non-reacted mixture C4 or butene is evaporated out from the top of the catalyst distillation column, theproduct mixture is fed into an azeotropic distillation column, added with an entrainer, the distillate at the top of the azeotropic distillation column can be laminated naturally, the entrainer or entrainer and part of sec-butyl acetate are refluxed into the top of the azeotropic distillation column, the azeotropic distillation column carrying little entrainer is fed into a treating column, to bedistilled to obtain sec-butyl acetate, and the bottom material of the azeotropic distillation column can be circulated and feedback to the reaction system. The invention has the advantages of high reaction conversion rate, simple separation process, low cost, low energy consumption, high material utilization and the like.

Description

technical field [0001] The invention relates to a method for preparing sec-butyl acetate, in particular to a method for preparing sec-butyl acetate with a product separation process. Background technique [0002] Currently, using acetic acid and mixed C 4 (or butene) as raw material, the method for preparing sec-butyl acetate is usually obtained by esterification reaction in a tubular fixed bed reactor. Compared with the traditional process, to mix C 4 (or butene) as a raw material, and using it to react with acetic acid to prepare sec-butyl acetate has the advantages of wide source of raw materials, low cost, good economic benefits, and environmental friendliness. U.S. Patent US5457228 discloses a method for preparing sec-butyl acetate, which is to mix the reaction material acetic acid and mixed C 4 (or butene) is passed from the upper part of the tubular fixed bed reactor, including the unreacted mixed C 4 A product mixture of (or butene), unreacted acetic acid and pro...

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, and 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 to make the olefin The polymerization tendency increases, which affects product purification; (3) the use of circulating pumps and heat exchangers increases energy consumption

The separation process disclosed in this Chinese patent application is only suitable for product separation using a tubular fixed-bed reactor, and the process is relatively complicated

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