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Method for separating sec-butyl acetate, acetic acid and heavy hydrocarbon

A technology of sec-butyl acetate and acetic acid, which is applied in the separation/purification of carboxylic acid esters, separation/purification of carboxylic acid compounds, organic chemistry, etc., and can solve the problem of impurities such as acetic acid, sec-butyl acetate and heavy hydrocarbons Methods, problems not mentioned, etc., to achieve the effect of alleviating easy scaling, reducing energy consumption and material consumption, and improving operating conditions

Inactive Publication Date: 2008-04-30
HUNAN ZHONGCHUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In all of the above utilizing acetic acid and butene or mixed C 4 Neither the raw material butene nor the mixed C 4 Polymerization will occur to form heavy hydrocarbons, and there is no method for separating impurities such as acetic acid, sec-butyl acetate and heavy hydrocarbons in the reaction mixture

Method used

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  • Method for separating sec-butyl acetate, acetic acid and heavy hydrocarbon

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] As shown in Figure 1, the mass composition is 52.28% of s-butyl acetate, 43.22% of acetic acid, hydrocarbons and other substances 4.5% of the mixture is added to the azeotropic rectification tower, while s-butyl acetate: water=4: 1 ( The ratio of mass percentage) adds entrainer water in the azeotropic rectification column. The temperature at the bottom of the azeotropic distillation tower is 120°C, and the temperature at the top of the tower is 85.5°C. The mass composition of the overhead distillate obtained after the azeotropic distillation is: 94.613% of sec-butyl acetate, 0.007% of acetic acid, and 0.98% of water , hydrocarbons and other substances 4.4%. This overhead can be further refined.

[0022] The mass composition of the side-drawing fraction at the lower part of the azeotropic distillation tower is: 7.28% of sec-butyl acetate, 89.3% of acetic acid, 0.42% of water, 3% of hydrocarbons and other substances, and the side-drawing fraction is recycled to the react...

Embodiment 2

[0027]The mass composition is that the mixture of 56.26% of sec-butyl acetate, 40.24% of acetic acid, hydrocarbons and other substances 3.5% is added to the azeotropic rectification column, and simultaneously by sec-butyl acetate: water=4: 1 (mass percentage) ratio to Add entrainer water in the azeotropic rectification tower. The temperature at the bottom of the azeotropic distillation column is 105°C, and the temperature at the top of the column is 78.1°C. The mass composition of the overhead distillate obtained after azeotropic distillation is: 95.99% of sec-butyl acetate, 0.01% of acetic acid, 0.9% of water, 3.1% of hydrocarbons and other substances. This overhead can be further refined.

[0028] The mass composition of the fraction drawn from the side stream at the lower part of the azeotropic distillation tower is: 8.32% of sec-butyl acetate, 88.17% of acetic acid, 0.51% of water, and 3% of hydrocarbons and other substances. The side draw fraction is recycled back to th...

Embodiment 3

[0031] The mass composition is that the mixture of sec-butyl acetate 52.79%, acetic acid 42.71%, hydrocarbons and other substances 4.5% is added to the azeotropic rectification column, and simultaneously by sec-butyl acetate: water=4: 1 (mass percentage) ratio to Add entrainer water in the azeotropic rectification tower. The temperature at the bottom of the azeotropic distillation tower is 128°C, and the temperature at the top of the tower is 86.5°C. The mass composition of the overhead distillate obtained after the azeotropic distillation is: 95.94% of sec-butyl acetate, 0.01% of acetic acid, 1% of water %, hydrocarbons and other substances 3.05%. This overhead can be further refined.

[0032] The mass composition of the fraction drawn from the side stream at the lower part of the azeotropic distillation tower is: 13.68% of sec-butyl acetate, 77.61% of acetic acid, 4.5% of water, 4.21% of hydrocarbons and other substances. The side draw fraction is recycled back to the reac...

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Abstract

The invention relates to a process for separating sec-butyl acetate, acetic acid and heavy hydrocarbon when preparing sec-butyl acetate by reacting acetic acid and butane or mixed C4. The invention is characterized in that the mixture containing sec-butyl acetate, acetic acid and heavy hydrocarbon is fed into an azeotropic distillation column, one entrainer which can form azeotropic material with sec-butyl acetate is added, sec-butyl acetate and acetic acid are separated via azeotropic distillation, while the azeotropic material formed by sec-butyl acetate and entrainer is evaporated out from column top, acetic acid and heavy hydrocarbon are fallen into a column reactor, bottom material is pumped out from the azeotropic distillation column, to be contacted with water completely, heavy hydrocarbon and water in the bottom material are naturally layered, while the upper heavy hydrocarbon is discharged and lower water is filled into the azeotropic distillation column. The invention has the advantages that the invention can discharge foreign substances as heavy hydrocarbon from system when effectively separating sec-butyl acetate and acetic acid, to improve product quality, improve operation condition, and reduce material and energy consumptions.

Description

technical field [0001] The present invention relates to a kind of in acetic acid and butene or mixed C 4 In the process of preparing sec-butyl acetate by reaction, a method for separating sec-butyl acetate, acetic acid and heavy hydrocarbons. Background technique [0002] Compared with the traditional technology, using 1-butene and 2-butene as raw materials and reacting with acetic acid to prepare sec-butyl acetate has the advantages of wide source of raw materials and low price, good economic benefits, and environmental friendliness. Therefore, its synthetic process The research has gained widespread attention, but there are few research reports on the separation and purification process of preparing sec-butyl acetate by reacting acetic acid with 1-butene and 2-butene. [0003] US5457228 reports a method for synthesizing sec-butyl acetate by reacting acetic acid with 1-butene and 2-butene, and the obtained olefin conversion rate and product selectivity are high. For its s...

Claims

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Application Information

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IPC IPC(8): C07C67/48C07C69/14C07C51/42C07C53/08B01D3/40
Inventor 胡先念李华席平翔
Owner HUNAN ZHONGCHUANG CHEM
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