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Production process of ethyl acetate

An ethyl acetate and production process technology, which is applied in the production field of pressurized esterification and rectification to produce ethyl acetate, can solve the problems of high energy consumption for rectification, large reflux and the like, and achieves good catalytic activity, reduced energy consumption and production capacity. boosted effect

Inactive Publication Date: 2019-06-18
刘红军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process, since the proportion of water generated in the reaction is much larger than that in the azeotrope, a large reflux is required at the top of the esterification tower, or a part of high-content ester or even finished ester needs to be added to the reactor to break the The reaction is balanced, so that the production of reactive distillation continues to be stable. Therefore, the rectification energy consumption of the esterification tower is relatively high, accounting for more than 60% of the entire production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Feed acetic acid and alcohol at a flow rate of 360L / h and 300L / h through the preheater into the esterification kettle, use sulfuric acid and toluenesulfonic acid with a molar ratio of 1:1 as catalysts, and add 0.5wt% catalyst, the reactor pressure is set to 0.05MPa, and the reaction temperature is set to 110°C; after the reaction, after heating and evaporation, the product ethyl acetate, water and some raw materials enter the esterification tower through the gas phase tube in the form of azeotrope; esterification The top of the tower is equipped with a nitrogen pipeline valve for pressurization. The temperature at the middle end of the esterification tower is set at 85°C, the temperature at the top of the esterification tower is set at 75°C, and the pressure at the top of the tower is set at 0.02MPa; Separation is carried out at the bottom of the tower, wherein the high boiler acetic acid remains at the bottom of the tower, ethyl acetate, water and a small amount of etha...

Embodiment 2

[0018] Put acetic acid and alcohol into the esterification kettle through the preheater at the flow rate of 420L / h and 360L / h, and use sulfuric acid, toluenesulfonic acid and methanesulfonic acid with a molar ratio of 1:1:1 as catalysts, Add 2wt% of the catalyst in the reaction vessel, set the pressure of the reactor to 0.15MPa, and set the reaction temperature to 130°C; after the reaction, after heating and evaporation, the product ethyl acetate, water and some raw materials enter the esterification through the gas phase tube in the form of azeotrope tower;

[0019] (2) A nitrogen pipeline valve for pressurization is installed at the top of the esterification tower. The temperature at the middle end of the esterification tower is set at 95°C, the temperature at the top of the esterification tower is set at 85°C, and the pressure at the top of the tower is set at 0.1MPa; Boilers are separated at the bottom of the esterification tower, in which high boiler acetic acid remains a...

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PUM

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Abstract

The invention discloses a production process of ethyl acetate. The process includes: (1) subjecting acetic acid and alcohol of equal mole to preheating treatment at 80-110DEG C, then letting the substances enter an esterification kettle, adding 0.5-2wt% of a catalyst into the esterification kettle, and carrying out reaction under the conditions of 0.05-0.15MPa and 110-130DEG C for 1-2.5h, subjecting the product ethyl acetate, water and raw material alcohol to heating evaporation, then letting the product enter the bottom of an esterification tower in an azeotrope form through gas pipe; (2) setting the middle part temperature of the esterification tower at 85-95DEG C, the top temperature of the esterification tower at 75-85DEG C, and the pressure of the tower top at 0.02-1MPa, separating the azeotrope in the esterification tower, keeping acetic acid with a high boiling point at the tower bottom, distilling the azeotrope with a low boiling point out from the tower top, and performing cooling by a cooler to obtain 40-45DEG C condensate liquid; and (3) letting the condensate liquid enter a buffer tank for collection form the cooler, pumping the condensate liquid in the buffer tank intoa phase separator by a pump for phase separation, making the water phase enter a recovery section, and letting 75-80% of the coarse ester in the ester phase flow back to the top of the esterificationtower.

Description

technical field [0001] The invention relates to a production method of ethyl acetate, in particular to a production method of pressurized esterification and rectification to produce ethyl acetate. Background technique [0002] Ethyl acetate is one of the most widely used fatty acid esters. It has excellent solubility properties and is a fast-drying industrial solvent. Ethyl acetate is widely used in the production of ethyl cellulose, cellulose acetate, chlorinated rubber, vinyl resin, cellulose acetate resin, synthetic rubber and other polymers and pharmaceutical intermediates; it can also be used in the production of liquid nitrocellulose ink for copiers; It is used as a refreshing agent in the textile industry; it is used as a fragrance extractant for special modified alcohol in the food industry; it is the most important fragrance additive in the fragrance industry and can be used as a component of flavoring agents. In addition, ethyl acetate can also be used as a solven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/54C07C69/14
Inventor 刘红军
Owner 刘红军