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Method for preparing sec-butyl acetate with direct esterification of acetic acid and butylene

A technology of sec-butyl acetate and butene, applied in the field of preparing sec-butyl acetate

Active Publication Date: 2012-05-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a kind of method that prepares sec-butyl acetate by direct esterification of acetic acid and butene, to solve the problem that sulfuric acid and resin catalyst use bring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 30g of 98% industrial acetic acid, 15g of 1-butene (98% content), and 0.6g of phosphotungstic acid were charged into a 100ml autoclave, and reacted at 120°C for 2 hours. After the reaction, the autoclave was cooled to room temperature and vented. The liquid phase material was analyzed by gas chromatography. The conversion rate of butene is 78.6%, the selectivity of sec-butyl acetate is 98.2%, and the others are butene dimers.

Embodiment 2-4

[0024] Reaction temperature is respectively 100, 140 and 160 ℃, and others are identical with embodiment 1. The results are shown in Table 1.

[0025] Table 1:

[0026] Example Reaction temperature / ℃ Butene conversion / % Ester selectivity / % Butene polymer selectivity / % 2 100 56.2 98.5 1.5 3 140 88.3 96.4 3.6 4 160 89.6 82.3 17.7

Embodiment 5

[0028] Adopt 36% industrial acetic acid as raw material, other is identical with embodiment 1. As a result of the reaction, the conversion rate of butene was 89.1%, and the product composition distribution: 78.5% of sec-butyl acetate, 21.0% of sec-butanol, and 0.5% of polymer.

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Abstract

A method relates to a method for preparing sec-butyl acetate from acetic acid and butylene. The sec-butyl acetate is prepared from acetic acid and butylene at a mole ratio of (0.1-10):1 by reacting in the presence of heteropoly acid as catalyst with a weight content being 0.02%-5% in acetic acid of under 0.5-6MPa at 70-180 DEG C. The method prevents device corrosion due to sulfuric acid catalyst and regeneration of resin catalyst. Since butylene material is adopted to react with acetic acid, no water generation in the reaction process and a separation process is simplified. The method can adopt a continuous high-pressure fixed bed reaction or a kettle batch operation.

Description

technical field [0001] The invention relates to a method for preparing sec-butyl acetate, in particular to a method for preparing sec-butyl acetate by direct reaction of acetic acid and butene. Background technique [0002] Butyl acetate is a good organic solvent, which is widely used in nitrocellulose, paint, artificial leather, medicine, ink and plastic industries. The traditional method of producing butyl acetate both at home and abroad is to adopt a batch-type tank reaction, and use sulfuric acid as a catalyst to catalyze the esterification reaction of acetic acid and butanol. Chinese patent CN1844076A has reported the method for large-scale production of butyl acetate with sulfuric acid as catalyst reaction distillation method, and this method uses acetic acid and butanol as reaction raw materials. Due to the use of concentrated sulfuric acid, it will inevitably cause problems such as equipment corrosion, and it is necessary to discharge acid-containing wastewater, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/08C07C69/14B01J27/188B01J32/00
CPCY02P20/584
Inventor 王华张今令谢文勇刘中民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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