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Method and device for preparing vinyl acetate through reactive distillation

A vinyl acetate and reactive distillation technology, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of not improving the EDA conversion rate and energy consumption of equipment, and shorten the reaction residence time. Time, improve yield and purity, reduce the effect of polymerization side reaction chance

Active Publication Date: 2020-02-21
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this patent, the cracking furnace is used to crack EDA and then the rectification tower is used to separate and purify VAC, which cannot improve the conversion rate of EDA and reduce the energy consumption of equipment, so there is room for further optimization

Method used

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  • Method and device for preparing vinyl acetate through reactive distillation
  • Method and device for preparing vinyl acetate through reactive distillation
  • Method and device for preparing vinyl acetate through reactive distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Mix the preliminarily purified EDA raw material liquid with benzenesulfonic acid and acetic anhydride in proportion and then feed it into the reactive distillation column. 144.450kmol / hr, benzenesulfonic acid 7.000kmol / hr. The feed temperature of the reactive distillation tower is 143°C, the tower operating pressure is 2bar, the tower top temperature is 94.556°C, the tower bottom temperature is 162.93°C, the reflux ratio is 1.9, the number of trays is 29, and the feed plate is the 10th Feed above the block tray, and the reaction residence time is 30min. After reactive distillation, the tower top obtains a VAC product with a purity of 99.97% (in terms of mass fraction). After heat exchange, the gas-phase material at the top of the separation tower enters the adiabatic flash tank to separate the gas-liquid two-phase, and the liquid-phase product enters the acetic acid separation tower. The feed temperature of the acetic acid separation tower is 162.96 ℃, and the tower op...

Embodiment 2

[0050] Mix the preliminarily purified EDA raw material liquid with benzenesulfonic acid and acetic anhydride in proportion and then feed it into the reactive distillation column. 144.450kmol / hr, benzenesulfonic acid 7.000kmol / hr. The feed temperature of the reactive distillation tower is 143°C, the operating pressure of the tower is 4bar, the temperature of the top of the tower is 120.51°C, the temperature of the bottom of the tower is 186.15°C, the reflux ratio is 1.9, the number of trays is 29, and the feed plate is the 10th Feed above the block tray, and the reaction residence time is 30min. After reactive distillation, the tower top obtains a VAC product with a purity of 99.97% (in terms of mass fraction). After heat exchange, the gas-phase material at the top of the separation tower enters the adiabatic flash tank to separate the gas-liquid two-phase, and the liquid-phase product enters the acetic acid separation tower. The feed temperature of acetic acid separation towe...

Embodiment 3

[0052] Mix the preliminarily purified EDA raw material liquid with benzenesulfonic acid and acetic anhydride in proportion and then add it to the reactive distillation column. 229.665kmol / hr, benzenesulfonic acid 18.000kmol / hr. The feed temperature of the reactive distillation column is 100°C, the tower operating pressure is 4bar, the tower top temperature is 120.498°C, the tower bottom temperature is 188.9°C, the reflux ratio is 1.8, the number of trays is 30, and the feed plate is the 10th Feed above the block tray, and the reaction residence time is 30min. After reactive distillation, the tower top obtains a VAC product with a purity of 99.98% (in terms of mass fraction). After heat exchange, the gas-phase material at the top of the separation tower enters the adiabatic flash tank to separate the gas-liquid two-phase, and the liquid-phase product enters the acetic acid separation tower. The feed temperature of acetic acid separation tower is 188.9 ℃, and tower operation pr...

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Abstract

The invention belongs to the field of vinyl acetate production. The invention particularly relates to a method and a device for preparing vinyl acetate through reactive distillation. The method comprises the following steps: introducing ethylidene diacetate, an acidic cracking agent and acetic anhydride into a reactive rectifying tower consisting of a rectifying section and a stripping section toprepare and separate high-purity vinyl acetate, extracting the VAC (vinyl acetate) from the top of the rectifying tower, extracting acetic acid, acid anhydride, the cracking agent, byproducts, EDA andimpurities from the tower bottom, and introducing into an acetic acid separation tower. The acetic acid is extracted from the top of the acetic acid separation tower and sent to an esterification reaction section for producing methyl acetate, the acetic anhydride and the cracking agent are extracted from the tower bottom, and the EDA returns to the rectifying tower. The purity of the obtained VACis 99.9 wt% or above, compared with a traditional reaction kettle-rectifying tower process, back mixing of materials is reduced, the conversion rate of the EDA, the yield of the VAC and the product purity are improved, a reboiler of the reaction rectifying tower is coupled with a tower top condenser of the acetic acid separation tower, and energy consumption is remarkably reduced.

Description

technical field [0001] The invention belongs to the field of vinyl acetate production, in particular to a method and device for preparing vinyl acetate through reactive distillation. Background technique [0002] Vinyl acetate, namely vinyl acetate (VAC for short), is one of the organic chemical raw materials with large output in the world, and is widely used in the production of polyvinyl acetate, polyvinyl alcohol, coatings, pastes, adhesives, vinylon , film, vinyl copolymer resin, acetal resin and a series of chemical and chemical fiber products. [0003] At present, the methods for producing vinyl acetate at home and abroad include ethylene gas phase method and acetylene gas phase method, which belong to the petrochemical process route. Since the rise of C1 chemistry, in the 1980s, Halcon Corporation of the United States and British Petroleum Corporation successively proposed a new process for the preparation of vinyl acetate from methanol and synthesis gas - carbonyl s...

Claims

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Application Information

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IPC IPC(8): C07C67/297C07C67/54C07C69/15
CPCC07C67/297C07C67/54C07C69/15Y02P20/10
Inventor 马江权朱铭范小强李正萍胡茂润钱湘马鑫
Owner CHANGZHOU UNIV
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