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Process for crylic acid azeotropism refining and recovering acetic acid

A technology of acrylic acid and ethyl propionate, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of unreasonable economy and high separation cost, and achieve the effects of saving steam, significant economic benefits, and reducing operating load

Active Publication Date: 2006-11-22
CHINA GASOLINEEUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low concentration of acetic acid, it is economically unreasonable to directly adopt the current azeotropic distillation or extraction plus azeotropic distillation purification acetic acid process, the separation cost is very high

Method used

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  • Process for crylic acid azeotropism refining and recovering acetic acid
  • Process for crylic acid azeotropism refining and recovering acetic acid
  • Process for crylic acid azeotropism refining and recovering acetic acid

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] The dehydration test was carried out with ethyl propionate / toluene (1:1) as the entrainer, and the ratio of the recirculation flow rate of the entrainer to the amount of the feed material was 3.2:1. The experimental operating pressure is 15kPaA, the temperature at the top of the tower is 49°C, and the temperature at the bottom of the tower is 82°C. The analysis results of the materials at the top of the tower and at the bottom of the tower are as follows:

[0031]

example 2

[0033] The dehydration test was carried out with ethyl propionate / toluene (2:1) as the entrainer, and the ratio of the recirculation flow rate of the entrainer to the amount of the feed material was 3.8:1. The experimental operating pressure is 15kPaA, the temperature at the top of the tower is 47°C, and the temperature at the bottom of the tower is 87°C. The analysis results of the materials at the top of the tower and at the bottom of the tower are as follows:

[0034]

example 3

[0036] The dehydration test was carried out with ethyl propionate / toluene (1:2) as the entrainer, and the ratio of the recirculation flow rate of the entrainer to the amount of the feed material was 3.4:1. The experimental operating pressure is 15kPaA, the temperature at the top of the tower is 51°C, and the temperature at the bottom of the tower is 82°C. The analysis results of the materials at the top of the tower and at the bottom of the tower are as follows:

[0037]

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PUM

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Abstract

This invention relates to a process for producing acroleic acid and esters thereof, concretely to acroleic acid azeotropic refining and acetic acid recovering process, wherein: apply ethyl cyclohexane, toluene, ethyl propionate and toluene derivative as the entrainer during the acroleic acid azeotropic distillation, set up a acroleic acid azeotropic column and an acetic acid removing column to remove the water and acetic acid in the crude acroleic acid solution, set up an organic film and air extraction column and an acetic acid azeotropic column to purify the 2-8% side produced acetic acid to be acetic acid product with concentration more than 85%. This invention is characterized of high dehydration rate and acetic acid removing rate. The byproduct acetic ester can be produced to be acetic acid product, which saves waste water treatment cost and improves the equipment benefits. By applying ethyl cyclohexane, toluene, ethyl propionate and toluene derivative as the entrainer, it can decrease the bottom temperature of the acroleic acid azeotropic column, which can decrease the polymerization tendency of the acroleic acid, improve the conversion rate of propone, decrease the acroleic acid carry-over loss and acroleic acid consumption, improve the product yield, extend the production cycle and improve the economical benefits of the apparatus.

Description

technical field [0001] The present invention relates to a method for producing acrylic acid, more specifically, relates to the process of rectifying and purifying crude acrylic acid, removing water and acetic acid contained therein and recovering the by-product acetic acid. Background technique [0002] The acrylic acid aqueous solution produced by the two-step oxidation of propylene contains 1-6% acetic acid, 30-45% water, 35-60% acrylic acid and a small amount of light and heavy components. Since the boiling points of water, acetic acid, and acrylic acid are relatively close, the purification of acrylic acid by conventional rectification requires a large amount of steam, and the conventional rectification requires a high temperature in the tower, which intensifies the tendency of self-polymerization of acrylic acid and affects the long-term stability of the device. run. At present, the effective way to solve this problem is to separate and purify...

Claims

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Application Information

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IPC IPC(8): C07C51/46C07C53/08C07C57/04
Inventor 田霖张锐锋白元峰魏立林唐忠杰巩传志刘学线纪忠斌刘利李欣平周江沛
Owner CHINA GASOLINEEUM ENG
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