Method for separating sec-butyl acetate from reaction mixture of acetic acid and hybrid C4

A kind of sec-butyl acetate and the technology after the reaction are applied in the field of separating sec-butyl acetate, and can solve the problems such as it is difficult to fully separate sec-butyl acetate and acetic acid.

Active Publication Date: 2007-08-01
HUNAN ZHONGCHUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the boiling points of sec-butyl acetate and acetic acid are very close, so it is difficult to fully separate sec-butyl acetate and acetic acid by simple distillation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: The mass composition is the mixture of 45.03% of sec-butyl acetate, 37.29% of acetic acid, 17.68% of hydrocarbons and other substances into the flash tower. The temperature at the bottom of the flash tower is 180.5°C, the temperature at the top of the flash tower is 56°C, and the pressure is 0.65MPa. The mass composition of the flash distillation bottom product obtained is: 52.21% of sec-butyl acetate, 43.24% of acetic acid, 4.55% of hydrocarbons and other substances.

[0028] The bottom material of the flashing tower enters the azeotropic rectification tower, and the entrainer water is added into the azeotropic rectification tower in the ratio of sec-butyl acetate: water=4:1 (mass percentage) simultaneously. The temperature at the bottom of the azeotropic distillation column is 125°C, and the temperature at the top of the column is 87.5°C. The mass composition of the overhead distillate obtained is: 94.07% of sec-butyl acetate, 0.1% of acetic acid, 4.83%...

Embodiment 2

[0031] Embodiment 2: The mass composition is the mixture of 51.38% of sec-butyl acetate, 36.10% of acetic acid, 12.52% of hydrocarbons and other substances into the flash tower. The temperature at the bottom of the flash tower is 165°C, the temperature at the top of the flash tower is 77°C, and the pressure is 0.48 MPa. The mass composition of the flash distillation bottom product obtained is: 55.98% of sec-butyl acetate, 40.29% of acetic acid, 3.73% of hydrocarbons and other substances.

[0032] The bottom material of the flashing tower enters the azeotropic rectification tower, and the entrainer water is added into the azeotropic rectification tower in the ratio of sec-butyl acetate: water=4:1 (mass percentage) simultaneously. The temperature at the bottom of the azeotropic distillation column is 115°C, and the temperature at the top of the column is 82.5°C. The mass composition of the overhead distillate obtained is: 95.13% of sec-butyl acetate, 0.04% of acetic acid, 3.83%...

Embodiment 3

[0035] Embodiment 3: The mass composition is the mixture of 44.98% of sec-butyl acetate, 36.53% of acetic acid, 18.49% of hydrocarbons and other substances into the flash tower. The temperature at the bottom of the flash tower is 188°C, the temperature at the top of the flash tower is 57°C, and the pressure is 0.56 MPa. The mass composition of the bottom product obtained from the flash distillation tower is: 52.49% of sec-butyl acetate, 42.78% of acetic acid, 4.73% of hydrocarbons and other substances.

[0036] The bottom material of the flashing tower enters the azeotropic rectification tower, and the entrainer water is added into the azeotropic rectification tower in the ratio of sec-butyl acetate: water=4:1 (mass percentage) simultaneously. The temperature at the bottom of the azeotropic distillation column is 121°C, and the temperature at the top of the column is 86.5°C. The mass composition of the overhead distillate obtained is: 94.84% of sec-butyl acetate, 0.07% of ace...

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PUM

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Abstract

The invention discloses a separating method of butyl para-acetate from the reacted compound of acetic acid and C4, which comprises the following steps: flashing to remove non-reacted C4 and light component; flowing production from the bottom of flashing tower into coboiling rectifying tower; adding coboiler A to separate butyl para-acetate and acetic acid; transmitting mass from coboiler into acid condensing tower; adding coboiler B to coboil and rectify again; condensing acetic acid; obtaining the product with purity over 99% and acetic acid content less than 0.01% and water less than 0.05%; recycling acetic acid.

Description

technical field [0001] The invention relates to a method for separating sec-butyl acetate from the mixture after the reaction of acetic acid and mixed C4. 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 received widespread attention. [0003] However, there are few reports on the separation and purification process of preparing sec-butyl acetate by reacting acetic acid with 1-butene and 2-butene. [0004] 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 separation method, it is mentioned in the patent that sec-butyl acetate can be sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/48C07C69/14
Inventor 胡先念李华
Owner HUNAN ZHONGCHUANG CHEM
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