Purification method of ethyl acetate

Abstract

The invention discloses a purification method of ethyl acetate, (1) at least an extraction tower A, an ethyl acetate rectifying tower B, an extraction agent recovery tower C and a 95% alcohol recovery tower D are adopted in the purification method; (2) an ethyl acetate solution layer is discharged from the top of the extraction tower, and an extraction agent layer is discharged from the bottom of the extraction tower; (3) a pure ethyl acetate layer is discharged from the top of the ethyl acetate rectifying tower B, and a mixture of extraction agents, a small amount of ethanol and water is discharged from the bottom of the ethyl acetate rectifying tower B; and (4) an extraction agent layer is discharged from the bottom of the extraction agent recovery tower C, a mixture of an acetic acid, water and ethyl acetate is discharged from the top of the extraction agent recovery tower C, a ternary azeotrope of the acetic acid, the water and the ethyl acetate is discharged from the top of the 95% alcohol recovery tower D, 95% ethanol is discharged from the lower middle part of the 95% alcohol recovery tower D, and water is discharged from the bottom of the 95% alcohol recovery tower D. The purification method of ethyl acetate disclosed by the invention is high in purification and separation efficiencies and good in separation effect.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for purifying ethyl acetate. Background technique [0002] Ethyl acetate is an important chemical raw material, which is widely used in perfumery, medicine and paint industry. In the industrial process of producing ethyl acetate, as production methods such as ethanol and acetic acid direct esterification method, ethanol catalytic oxidation method or catalytic denitrification method, all relate to water, alcohol and ethyl acetate separation, separation method in the prior art Generally, the feature that ethyl acetate itself forms a ternary azeotrope with water and ethanol is used. After the ternary azeotrope vapor is cooled, it is divided into two phases in the phase separator. The light phase is the ester phase, which is rich in ethyl acetate. , containing a small amount of ethanol and water. The heavy phase is the water phase, which is rich in water, secondly contai...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the product ethyl acetate itself is used as a constant boiling agent. The disadvantage is that the ester phase in the normal temperature and pressure stratifier has a lot of water content, and its water carrying capacity as the reflux liquid is poor, so a large reflux ratio needs to be maintained. (R=4), so the amount of ester phase sent to the dehydration tower to produce ethyl acetate is not large, which limits the output

In addition, the water content of the ester phase sent to the esterification tower and dehydration tower is high, so the energy consumption is relatively large

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