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Method for producing ethyl acetate by using entrainer

The technology of ethyl acetate and entraining agent is applied in the field of producing ethyl acetate by using entraining agent, which can solve the problems of large reflux ratio of esterification tower, limiting device production capacity and high energy consumption, and achieves reduction of reflux ratio, remarkable economic effect, The effect of reducing energy consumption

Inactive Publication Date: 2010-06-16
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The bottleneck of the traditional ethyl acetate production process lies in the insufficient strengthening of core processes such as esterification reaction and rectification separation. The molar ratio of the binary azeotrope formed by ethyl acetate and water does not match the ratio of esterification reaction. A large amount of reaction by-product water stays in the reaction system, which restricts the forward direction of the esterification reaction, and requires a large amount of crude ester as an entrainer to reflux the enriched water in the entrainment system, resulting in a large reflux ratio of the esterification tower and high energy consumption. High, which greatly limits the production capacity of the device

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  • Method for producing ethyl acetate by using entrainer
  • Method for producing ethyl acetate by using entrainer
  • Method for producing ethyl acetate by using entrainer

Examples

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Embodiment 1

[0022] With the raw material that is made up of ethanol, acetic acid (the proportioning of raw material is: the molar percentage composition of ethanol is 48%, the molar percentage composition of acetic acid is 52%), and acetic acid is excessive, guarantees the high acidity of esterification kettle, prevents that ethanol is too much Enter the esterification tower to achieve the purpose of controlling the top composition of the esterification tower as close as possible to the ethyl acetate-water binary azeotropic composition, thereby facilitating the phase separation of the phase separator at the top of the esterification tower and reducing the water content of the crude ester. The entraining agent is added at one time, and the amount of addition is 5% (mass) of the esterification still material, supplemented intermittently in small amounts. use figure 1 The process shown is for esterification reaction-rectification. The reaction temperature of the esterification tank is 104-10...

Embodiment 2

[0028] A raw material composed of ethanol and acetic acid mixture (the ratio of the raw material is: the molar percentage of ethanol is 50%, and the molar percentage of acetic acid is 50%). The entraining agent is added at one time, and the amount of addition is 8% (mass) of the esterification still material, supplemented intermittently in small amounts. use figure 1 The process shown is for esterification reaction-rectification. The reaction temperature of the esterification tank is 105°C and the pressure is 0.125MPa. ~90℃, pressure 0.108~0.11MPa, temperature of the stripper tank 80~83℃, pressure 0.108~0.11MPa, stripper top temperature 71~72℃, pressure 0.10~0.105MPa.

[0029] Using the chemical process simulation software ASPEN PLUS to simulate and calculate the entire process of the reactor, esterification tower, and stripping tower, the calculation results are shown in Table 2. The purity of the ethyl acetate product can reach 99.90wt%, and the ethanol content is 0.01wt%. ...

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Abstract

The invention discloses a method for producing ethyl acetate by using an entrainer. The method comprises the following steps: the entrainer and concentrated sulfuric acid used as a catalyst are added into an esterification kettle at one time, and supplemented intermittently; when acetic acid and ethanol used as raw materials are processed by a side line stream heat exchanger, a preheater, an esterification reboiler, the esterification kettle, a gas-liquid separator, an esterification column, a condenser and a phase separator, the mixed liquor obtained from the side stream of the esterification column exchanges heat with the raw materials and enters a cooler to be cooled to 40 DEG C, all or part of the organic phase ( mainly containing the entrainer) obtained from the phase separator by phase separation returns to the circulating water entrainment of the esterification column, and the ethyl acetate is obtained from the kettle of the stripping tower, wherein the entrainer is isobutyl propionate, propyl isobutyrate, or the mixture of isobutyl propionate and propyl isobutyrate. In the method for producing ethyl acetate by using an entrainer, the entrainer has the advantages of large water entrainment quantity, small use amount and capability of cyclic utilization, thereby reducing the energy consumption and material consumption in the production process, expanding the production capacity and being beneficial to the improvement of the industrial production technology.

Description

technical field [0001] The present invention relates to a kind of production method of ethyl acetate, particularly a kind of method that uses entrainer to produce ethyl acetate. Background technique [0002] my country's industrial energy consumption accounts for more than 50% of the total energy consumption of the whole society, and the energy consumption per unit product of many energy-intensive industrial processes is about 30-90% higher than the international advanced level. Ethyl acetate is an important chemical solvent and basic organic chemical raw material, widely used in industrial solvents, adhesives, extractants for the production of medicines, organic acids and other products, raw materials for spices, etc. The production of solvents such as acetate is mainly a process industry with high energy consumption and high material consumption based on thermal processing processes such as reaction and separation. Most of the existing production technologies of ethyl ace...

Claims

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Application Information

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IPC IPC(8): C07C69/14C07C67/58
Inventor 陈清林张冰剑胡松胡鹏飞佘志鸿高学农
Owner SUN YAT SEN UNIV