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Method for separating sec-butyl acetate from mixture after reaction of acetic acid and butylene or mixture of C4

A kind of sec-butyl acetate and the technology after the reaction are applied in the field of separating sec-butyl acetate, which can solve the problems of increasing equipment investment, operating energy consumption, and increasing equipment corrosion, so as to reduce equipment investment and operating costs, reduce corrosion, and prolong use. effect of life

Active Publication Date: 2008-02-27
HUNAN ZHONGCHUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method needs to introduce entrainer water in the system, because there is acetic acid to exist in the system, this will greatly increase the corrosion of acetic acid to equipment; Activity and service life have a great negative impact; moreover, in order to control the water content of circulating acetic acid, it is necessary to set up an acid concentration tower in the process to dehydrate circulating acetic acid, which will increase equipment investment and operating energy consumption

Method used

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  • Method for separating sec-butyl acetate from mixture after reaction of acetic acid and butylene or mixture of C4

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Referring to accompanying drawing 1, after acetic acid and mixed C4 react the gained mixture, its mass composition is sec-butyl acetate 45.65%, acetic acid 37.07%, hydrocarbons and other substances 17.28%, this mixture 1 imports flash column A. The temperature at the bottom of the flash tower A is 180.5°C, the temperature at the top of the tower is 56°C, and the pressure is 0.65MPa. The product 3 is obtained at the bottom of the flash tower A, and its mass composition is: 52.10% of sec-butyl acetate, 43.39% of acetic acid, 4.51% of hydrocarbons and other substances. The remaining hydrocarbons 2 are output from the top of the tower.

[0026] The bottom material 3 of the flash tower is input into the separation column B of acetic acid and sec-butyl acetate. The temperature at the bottom of the acetic acid and sec-butyl acetate separation tower B is 122°C and the pressure is 108KPa; the temperature at the top of the tower is 112°C and the pressure is 100KPa. The mass com...

Embodiment 2

[0030] Referring to accompanying drawing 1, the mixture 1 after the reaction of acetic acid and mixing C4, its mass composition is sec-butyl acetate 51.44%, acetic acid 35.95%, hydrocarbons and other substances 12.61%, and this mixture 1 is imported flash column A. The temperature at the bottom of the flash tower A is 165°C, the temperature at the top of the tower is 65°C, and the pressure is 0.48MPa. The product 3 is obtained at the bottom of the flash tower A, and its mass composition is: 55.98% of sec-butyl acetate, 40.29% of acetic acid, 3.73% of hydrocarbons and other substances. Part of the hydrocarbons 2 is output from the top of the flash tower A.

[0031] The bottom material 3 of the flash tower A enters the acetic acid and sec-butyl acetate separation tower B. The pressure at the bottom of the acetic acid and sec-butyl acetate separation tower B is 6.3Kpa, the temperature is 47°C, the pressure at the top of the tower is 5Kpa, and the temperature is 35°C. The overhe...

Embodiment 3

[0035] Referring to accompanying drawing 1, the mixture 1 after the reaction of acetic acid and mixed C4, its mass composition is sec-butyl acetate 48.21%, acetic acid 33.85%, hydrocarbons and other substances 17.94%, this mixture 1 is input flash column A. The temperature at the bottom of the flash tower A is 178° C., the temperature at the top of the tower is 55° C., and the pressure is 0.50 MPa. The product 3 is obtained at the bottom of flash tower A, and its mass composition is: 55.48% of sec-butyl acetate, 38.96% of acetic acid, 5.56% of hydrocarbons and other substances. Part of the hydrocarbons 2 is output from the top of the flash tower A.

[0036] The bottom material 3 of the flash tower A enters the acetic acid and sec-butyl acetate separation tower B. The pressure at the bottom of the acetic acid and sec-butyl acetate separation tower B is 80Kpa, the temperature is 89°C, the pressure at the top of the tower is 76Kpa, and the temperature is 76°C. The overhead dist...

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Abstract

The invention provides a separating method of butyl acetate from mixture after reaction of acetic acid and butane or mixing C4, which comprises the following steps: stripping non-reacting butane or mixing C4 and light component through flash evaporation; separating butyl acetate and acetic acid under atmosphere pressure and decompression after entering flash tower (A) bottom product into the acetic acid and the butyl acetate knockout tower (B); obtaining the butyl acetate by distillation after materials on top of the acetic acid and the butyl acetate knockout tower (B) to enter into treating tower (C); recycling bottom materials of acetic acid and butyl acetate knockout tower (B). The invention reduces erosion of acetic acid to device for not introducing water to system to extend durability of accelerant and reduces equipment investment and operating expenditure, and the purity of butyl acetate is more than 99% and quality content of acetic acid is less than 0. 01%, and quality content of water is less than 0. 01%.

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 butene or 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 ...

Claims

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Application Information

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IPC IPC(8): C07C69/14C07C67/04C07C67/48
Inventor 胡先念李华
Owner HUNAN ZHONGCHUANG CHEM
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