A kind of separation method and device of ethanol and ethyl acetate

A technology of ethyl acetate and ethanol, which is applied in the field of separation of ethanol and ethyl acetate, can solve the problems of large tower load and large reflux, reduce the number of plates and reflux ratio, reduce energy consumption of separation, and reduce system circulating water volume Effect

Active Publication Date: 2022-05-13
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the invention is to provide a kind of separation method and device of ethanol and ethyl acetate in order to overcome the relatively large reflux that exists in the separation process of prior art ethanol and ethyl acetate, and the problem that the tower load is large

Method used

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  • A kind of separation method and device of ethanol and ethyl acetate
  • A kind of separation method and device of ethanol and ethyl acetate
  • A kind of separation method and device of ethanol and ethyl acetate

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Embodiment approach

[0038]According to a preferred embodiment of the present invention, the conditions for rectification in the ethanol rectification tower 3 include: the temperature at the top of the tower is 30-78°C, the pressure at the top of the tower is 0.01-0.1MPa, the temperature at the bottom of the tower is 74-104°C, The pressure at the bottom of the tower is 0.04-0.13MPa, the number of plates is 29-40, and the reflux ratio is 10-20; more preferably, the temperature at the top of the tower is 60-78°C, the pressure at the top of the tower is 0.06-0.1MPa, and the temperature at the bottom of the tower is 94-104°C, the pressure at the bottom of the tower is 0.08-0.13MPa, the number of plates is 34-38, and the reflux ratio is 13-18.

[0039] According to a specific embodiment of the present invention, the second distillate can be condensed through the first condenser 7 (preferably condensed to 20-30°C), and then passed into the top separator 9 of the ethanol separation tower.

[0040] Accord...

specific Embodiment approach

[0057] According to a specific embodiment of the present invention, the method also includes cooling the heat-exchanged third residue with a cooler 6 (preferably cooled to 20-50° C.) and then sending it to the top separator 9 of the ethanol separation tower .

[0058] According to a preferred embodiment of the present invention, the conditions for distillation and separation in the acetic acid separation tower 1 include: the temperature at the top of the tower is 35-90°C, the pressure at the top of the tower is 0.01-0.11MPa, and the temperature at the bottom of the tower is 97-130°C. The bottom pressure is 0.06-0.16MPa, the number of trays is 16-27, and the reflux ratio is 2.5-5; more preferably, the temperature at the top of the tower is 75-85°C, the pressure at the top of the tower is 0.06-0.1MPa, and the temperature at the bottom of the tower is 115 -125°C, the pressure at the bottom of the tower is 0.1-0.15MPa, the number of trays is 20-24, and the reflux ratio is 3-5.

...

Embodiment 1

[0078] This embodiment is used to illustrate the separation method and device for ethanol and ethyl acetate provided by the present invention.

[0079] 1) if figure 1 As shown, the material to be separated containing ethanol, ethyl acetate and acetic acid (see Table 1 for specific composition) is preheated to 59 ° C through heat exchanger 5 and sent to acetic acid separation tower 1 for distillation and separation (see Table 2 for specific conditions) ), a first distillate is obtained at the top of the column, and a first residue mainly containing acetic acid and water is obtained at the bottom of the column.

[0080] 2) The first distillate is sent to the ethanol separation tower 2 for distillation and separation (see Table 2 for specific conditions), the second distillate is obtained at the top of the tower, and the second residue mainly containing ethanol and water is obtained at the bottom of the tower , the second residue is rectified in the ethanol rectification tower 3...

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Abstract

The invention relates to the field of separation of ethanol and ethyl acetate, and discloses a method and device for separating ethanol and ethyl acetate, the method comprising: 1) separating materials containing ethanol and ethyl acetate in an ethanol separation tower Distillation and separation, the top of the tower obtains a second distillate, and the bottom of the tower obtains a second residue mainly containing ethanol and water; the second residue is rectified in an ethanol rectification tower, and ethanol is obtained at the top of the tower; 2) The second distillate and water are mixed and contacted in the overhead separator of the ethanol separation tower for extraction and separation to obtain a water phase and an oil phase; 3) the oil phase is rectified in an ethyl acetate rectification tower , the fourth distillate was obtained at the top of the column, and ethyl acetate was obtained at the bottom of the column. The ethanol and ethyl acetate separation method and device provided by the invention can simultaneously obtain high-purity ethanol and ethyl acetate products, meeting the product quality requirements of industrial alcohol and industrial ethyl acetate.

Description

technical field [0001] The present invention relates to the separation field of ethanol and ethyl acetate, in particular to a kind of separation method and device of ethanol and ethyl acetate. Background technique [0002] Ethanol is an important bulk chemical, which can be used as vehicle fuel when added to gasoline. The demand for ethanol in my country is increasing. At present, ethanol production mainly adopts fermentation method, which not only has high cost, but also has the problem of competing with people for grain and land with grain. Therefore, the development of coal-to-ethanol will have a huge impact on the entire energy market and structural changes. There are three main routes for coal-to-ethanol production: (1) One-step production of ethanol from syngas. Coal gasification produces syngas, syngas is produced into low-carbon alcohols in one step, and ethanol is separated from mixed low-carbon alcohols. (2) Ethanol is produced by hydrogenation of acetate. Coal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/80C07C29/86C07C31/08C07C67/54C07C69/14
CPCC07C29/80C07C29/86C07C67/54C07C31/08C07C69/14
Inventor 姚金松陈强孟祥堃胡云剑张雪冰佟瑞利
Owner CHNA ENERGY INVESTMENT CORP LTD
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