Control method for synthesizing ethyl acetate by esterification method

Abstract

The invention belongs to the field of processing of ethyl acetate, and particularly relates to a control method for synthesizing ethyl acetate by using an esterification method. The control method comprises the following steps: a, controlling molar ratio of acetic acid to ethanol in a mixer to be 1:1, and conveying mixed materials stirred evenly to an esterification tower; b, only arranging sulfuric acid at the bottom of the esterification tower; c, heating through an esterification reboiler and carrying out esterification reaction to obtain gaseous ethyl acetate and water; and d, feeding the gaseous ethyl acetate and the water into an esterification phase splitter through an esterification condenser and an esterification cooler to obtain the ethyl acetate. An existing ethyl acetate synthesizing system is simplified, the ratio of the acetic acid, the ethanol and the sulfuric acid as a catalyst and reaction temperature are controlled, then the technical problem of low production rate of the ethyl acetate in a traditional technology is solved, meanwhile, a follow-up separating system is simplified, then consumption of steam is reduced by 50%, and the production efficiency of the product is improved.

Description

technical field [0001] The invention belongs to the field of ethyl acetate processing, in particular to a control method for synthesizing ethyl acetate by esterification. Background technique [0002] The molecular formula of ethyl acetate is C4H8O2, and the CAS number is 141-78-6. It is a compound formed by replacing the hydroxyl group in acetic acid with ethoxy group. Colorless transparent liquid, with fruity aroma, volatile, sensitive to air, able to absorb water, water can make it decompose slowly and show acidic reaction. Ethyl acetate is also called ethyl acetate. Pure ethyl acetate is a colorless, transparent liquid with a pungent odor. It is a fine chemical product with a wide range of uses. It has excellent solubility, quick drying, and a wide range of uses. It is a very important organic chemical raw material and extremely Good industrial solvent, widely used in the production process of cellulose acetate, ethyl cellulose, chlorinated rubber, vinyl resin, cellulo...

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Problems solved by technology

[0004] Since the esterification reaction is a reversible reaction, and the esterification method production device adopts a reaction kettle and a ceramic packed tower as the esterifier, it is easy to cause the following problems in the reaction system: 1. Due to the use of strong acid in the esterification reaction Catalysts can easily cause side reactions such as sulfonation and carbonization, resulting in rapid pollution of the reaction system in chemical production, frequent cleaning cycles, and erosion and corrosion of ceramic fillers, which can easily reduce the rectification effect; 2. Use the reactor as an esterifier In the reaction process of the traditional esterification method, due to the low conversion rate of ethanol, the alcohol content at the top of the ceramic packed tower is relatively high, resulting in the unreacted ethanol being brought into the subsequent separation system, and the unreacted alcohol needs to be separated after separation. Re-enter the reaction system to participate in the esterification reaction, which will inevitably increase the energy consumption of the reaction and separation system in the process of the esterification reaction;

[0005] 3. Since the esterification reaction is a reversible reaction, in order to increase the yield of ester in the existing process, the general system is relatively complicated and the steam consumption is large, thereby reducing the profit margin of the product

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