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New energy-saving production process of ethyl acetate

A technology of ethyl acetate and a new process, which is applied in the field of new energy-saving production process of ethyl acetate, which can solve the problems of high energy consumption, limited production capacity, large reflux ratio of esterification tower and light removal tower, etc., and achieve the reduction of moisture content , Improve production capacity, reduce the effect of reflux ratio

Inactive Publication Date: 2011-04-27
江门天诚溶剂制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In short, in the traditional process, due to a certain amount of water circulating in the system, the reflux ratio of the esterification tower and the light removal tower is large, resulting in high energy consumption and limited production capacity.

Method used

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  • New energy-saving production process of ethyl acetate
  • New energy-saving production process of ethyl acetate
  • New energy-saving production process of ethyl acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Taking a set of 15,000 t / a ethyl acetate plant as an example, PVA (polyvinyl alcohol) / PAN (polyacrylonitrile) composite membrane is used, and the temperature of the 2-esterified top organic phase entering the 5-vacuum hood is 45°C , the vacuum pressure is absolute pressure 200pa, the water content of crude ester is reduced from 5% to 0.95% after membrane separation and dehydration, compare the energy consumption and load of the esterification tower and light removal tower after the original process and this process, the results are shown in Table 1 (where the steam grade is pressure 0.8MPa, temperature 200°C).

[0018]

[0019] Table 1: Comparison of energy consumption and load between the membrane separation process and the original process

Embodiment 2

[0021] Taking a set of 15,000 t / a ethyl acetate plant as an example, using CS (chitosan) / PVP (polyvinylpyrrolidone) composite membrane, the temperature at which the 2-esterification tower top organic phase enters the 5-vacuum hood is 41°C , the vacuum pressure is an absolute pressure of 300pa, and the water content of the crude ester is reduced from 5% to 1.03% after membrane separation and dehydration. The energy consumption and load of the esterification tower and the light removal tower are compared between the original process and this process, and the results are shown in Table 2 (where the steam grade is pressure 0.8MPa, temperature 200°C).

[0022]

[0023] Table 2: Comparison of energy consumption and load between the membrane separation process and the original process

Embodiment 3

[0025] Taking a set of 15,000 t / a ethyl acetate plant as an example, PVA (polyvinyl alcohol) / PAN (polyacrylonitrile) composite membrane is used, and the temperature of the 2-esterified top organic phase entering the 5-vacuum hood is 45°C , the vacuum pressure is 200pa absolute pressure, the moisture content of the crude ester after membrane separation and dehydration is reduced from 5% to 0.95%, increasing the production load of the esterification tower and light removal tower, comparing the original process with the esterification tower after adopting this process And the production capacity of the light removal tower and the unit consumption of steam, the results are shown in Table 3 (where the steam grade is 0.8MPa at pressure and 200°C at temperature).

[0026]

[0027] Table 3: Comparison of the production capacity and steam unit consumption of the membrane separation process and the original process.

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Abstract

The invention relates to a new energy-saving production process of ethyl acetate. The process comprises the sections of esterification, light removal, refining and recovery, and the membrane separation section is added between the esterification section and the light removal section. The organic phase at the esterification tower top is subject to membrane separation to desorb most moisture, and one part of the treated organic phase returns to an esterification tower to reflow and the other part is sent to a light removal tower to be refined. The membrane separation section comprises a vacuum cover (with a membrane module inside), a condenser, a penetrating fluid tank, a buffer tank and a vacuum pump. The method provided by the invention can greatly reduce water circulating in the esterification and light removal sections, save the heating steam in the esterification tower and the light removal tower, reduce the loads of the esterification tower and the light removal tower and further improve the production capability of the esterification tower and the light removal tower.

Description

technical field [0001] The invention relates to a new energy-saving production process of ethyl acetate. Specifically, a membrane separation section is added between the esterification tower and the light removal tower. The organic phase at the top of the esterification tower undergoes membrane separation to remove most of the water, part of which is returned to the esterification tower for reflux, and part of which is sent to the light removal tower for refinement. Background technique [0002] Ethyl acetate is one of the most widely used fatty acid esters. It has excellent solubility and is a fast-drying industrial solvent. It is widely used in ethyl fiber, acetate fiber, chlorinated rubber, vinyl resin, acetate fiber Production of resin, synthetic rubber and other polymers and pharmaceutical intermediates; it can also be used to produce liquid nitrocellulose ink for copiers; it can be used as a freshener in the textile industry; it can be used as a flavor extractant for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/08C07C67/56
CPCY02P20/10
Inventor 叶子轩于冬娥朱宏文叶四华汪尚飞冯佩洪
Owner 江门天诚溶剂制品有限公司
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