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

A technology of sec-butyl acetate and acetic acid, applied in the field of separating sec-butyl acetate, acetic acid and heavy hydrocarbons, can solve the problems such as methods for impurities such as acetic acid, sec-butyl acetate and heavy hydrocarbons that are not mentioned or proposed, and achieves The effect of reducing energy and material consumption, alleviating easy scaling, and improving product quality

Inactive Publication Date: 2008-12-17
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, the mass composition is 52.28% of sec-butyl acetate, 43.22% of acetic acid, hydrocarbons and other substances. Add the entrainer water to the azeotropic rectification column in the proportion. 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 reaction system.

[0023] The bottom material of the azeotropic rectification tower enters the lower part of...

Embodiment 2

[0027]The mass composition is that the mixture of sec-butyl acetate 56.26%, acetic acid 40.24%, 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 the reac...

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, and 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, and 4.21% of hydrocarbons and other substances. The side draw fraction is recycled back to t...

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Abstract

The invention relates to a method for separating sec-butyl acetate, acetic acid and heavy hydrocarbons in the process of preparing sec-butyl acetate by reacting acetic acid with butene or mixed C4, which is characterized in that: it will contain sec-butyl acetate, acetic acid and heavy hydrocarbons The mixture of hydrocarbons is sent to the azeotropic distillation column, and an azeotropic agent that can form an azeotrope with sec-butyl acetate is added, and sec-butyl acetate and acetic acid are separated through azeotropic rectification, and sec-butyl acetate and azeotropic The azeotrope formed by the solvent is distilled from the top of the tower, and the acetic acid and heavy hydrocarbons fall into the bottom of the tower; the bottom material is drawn out from the azeotropic rectification tower, and the bottom material is fully contacted with water, and the heavy hydrocarbon in the bottom material Naturally stratified with water, the upper heavy hydrocarbon layer is discharged, and the lower water layer is injected into the azeotropic distillation column. The invention has the advantages of effectively separating sec-butyl acetate and acetic acid, and simultaneously separating heavy hydrocarbons and other impurities from the system, improving product quality, improving operating conditions, and reducing energy consumption and material consumption.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/48C07C69/12B01D3/34
Inventor 胡先念李华席平翔
Owner HUNAN ZHONGCHUANG CHEM
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