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Rectifying device and method of vinyl acetate

A technology of vinyl acetate and rectification, applied in the direction of separation methods, chemical instruments and methods, fractionation, etc., to achieve the effect of simple structure and easy realization

Active Publication Date: 2017-06-30
SINOPEC SICHUAN VINYLON FACTORY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the preparation methods of vinyl acetate mainly include ethylene method and acetylene method. Among them, the ethylene method is dominant because of its manufacturability and economical efficiency. The production capacity of vinyl acetate using this method accounts for more than 70% of the total production capacity. The acetylene process is economically inferior to the ethylene process, but in areas where calcium carbide and natural gas are abundant, the acetylene process is still quite competitive

Method used

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  • Rectifying device and method of vinyl acetate
  • Rectifying device and method of vinyl acetate
  • Rectifying device and method of vinyl acetate

Examples

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Embodiment 1

[0023] Embodiment 1, a kind of rectification method of vinyl acetate, comprises vinyl acetate rectification unit, see figure 1 , including primary rectification tower 1, secondary rectification tower Ⅰ2-1 and secondary rectification tower II 2-2, primary rectification tower 1 has 44 trays in total, and the feed plate is the 25th tray, and the second The first-stage rectification tower I2-1 has 45 trays, and the second-stage rectification tower II2-2 has 99 trays; the rectification section of the first-stage rectification tower 1 is connected with the second-stage rectification tower I2-1, and the second The rectification column I2-1 is provided with a VAC extraction outlet 4, and the VAC extraction outlet 4 is arranged at the 25th tray. The stripping section of the first rectification tower 1 is connected with the second rectification tower II2-2, the feed plate of the second rectification tower II2-2 is the 24th tray, and the second rectification tower II2-2 is equipped with ...

Embodiment 2

[0029] Embodiment 2, a kind of rectification method of vinyl acetate, comprises vinyl acetate rectification unit, see figure 2 , including a first-stage rectification tower 1, a second-stage rectification tower I2-1, a second-stage rectification tower II2-2 and a third-stage rectification tower. The primary rectification column 1 has 44 trays in total, the feed plate is the 25th tray, the secondary rectification column I2-1 has 45 trays, and the secondary rectification column II2-2 has 44 trays, The three-stage rectification column 3 has 45 trays. The secondary rectification column I2-1 is provided with a VAC extraction outlet 4, and the VAC extraction outlet 4 is arranged at the 25th tray. The stripping section of the primary rectification tower 1 is connected with the secondary rectification tower Ⅱ2-2, the feed plate of the secondary rectification tower Ⅱ2-2 is the 24th tray, and the secondary rectification tower Ⅱ2-2 is connected with the third stage The three-stage rec...

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Abstract

The invention relates to a rectifying method of vinyl acetate. The rectifying method comprises the following steps of firstly, using a rectifying tower to rectify the degassed and crudely distilled vinyl acetate; then, respectively rectifying the vinyl acetate in a rectifying section and a stripping section of the rectifying tower. The rectifying method has the advantages that by rectifying the vinyl acetate in the stripping section, the contents of benzene and benzene series in the vinyl acetate are greatly reduced; the problem of high contents of the benzene and the benzene series in the vinyl acetate in the prior art is solved, and the quality standard of smoke water-based latex products is met.

Description

technical field [0001] The invention relates to a rectification device for vinyl acetate. The present invention also relates to a method for rectifying vinyl acetate using the device. Background technique [0002] At present, the preparation methods of vinyl acetate mainly include ethylene method and acetylene method. Among them, the ethylene method is dominant because of its manufacturability and economical efficiency. The production capacity of vinyl acetate using this method accounts for more than 70% of the total production capacity. The acetylene method is economically inferior to the ethylene method, but in areas where calcium carbide and natural gas are abundant, the acetylene method is still quite competitive. [0003] The main process of producing vinyl acetate by acetylene method is ebullating bed and fixed bed gas phase synthesis. Among them, the fixed bed gas phase synthesis of vinyl acetate is acetic acid vapor and excess acetylene at 0.12-0.14MPa (absolute pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/54C07C69/15B01D3/14
CPCB01D3/146C07C67/54C07C69/15
Inventor 王传刚秦庆伟陈旗张文英乔扬
Owner SINOPEC SICHUAN VINYLON FACTORY
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