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Ethanol-water separation method

A technology for ethanol and water-containing ethanol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of poor separation effect and difficult water separation, achieve obvious dehydration effect, improve treatment effect, and improve operation. convenient effects

Inactive Publication Date: 2019-04-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem that the separation of water in ethanol is difficult and the separation effect is not good, the invention provides a method for separating ethanol-water using ethyl tert-butyl ether (ETBE) as an entraining agent; aiming at simplifying the treatment process , improve the dehydration effect

Method used

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  • Ethanol-water separation method

Examples

Experimental program
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Effect test

Embodiment 1

[0073] The low-concentration ethanol aqueous solution that mass percent is about 5% joins in the ethanol concentration tower with the speed of 540g / min, adds about 0.6% ethanol with the speed of 3.5g / min simultaneously, 3.7%ETBE (massfraction, remaining part is water) circulating fluid. The plate number of the ethanol concentration tower is 16, and the reflux ratio is 2:1; the temperature at the top of the concentration tower is 76.3°C.

[0074] The ethanol concentrated liquid with a flow rate of 72.2 g / min and a purity of 77.6% (mass fraction) is obtained, and enters the azeotropic rectification tower, and the temperature at the top of the azeotropic rectification tower is controlled to be 65.5° C. The number of trays in the azeotropic rectification column is 22, and the flow rate of the added ETBE is 0.47g / min; the azeotrope obtained at the top of the tower is condensed and enters the separatory tank.

[0075] The liquid separation tank is operated under normal pressure, an...

Embodiment 2

[0077] The low-concentration ethanol aqueous solution that mass percent is about 5% joins in the ethanol concentration tower with the speed of 540g / min, adds about 0.6% ethanol with the speed of 3.5g / min simultaneously, 3.7%ETBE (massfraction, remaining part is water) circulating fluid. The plate number of the ethanol concentration tower is 16, and the reflux ratio is 5:2; the temperature at the top of the concentration tower is 76.0°C.

[0078] The ethanol concentrated liquid with a flow rate of 61.9 g / min and a purity of 80.3% (mass fraction) is obtained, and enters the azeotropic rectification tower, and the temperature at the top of the azeotropic rectification tower is controlled to be 65.5° C. The number of trays in the azeotropic rectification column is 22, and the flow rate of the added ETBE is 0.33g / min; the azeotrope obtained at the top of the tower is condensed and enters the separatory tank.

[0079] The liquid separation tank is operated under normal pressure, an...

Embodiment 3

[0081] The low-concentration ethanol aqueous solution that mass percent is about 5% joins in the ethanol concentration tower with the speed of 540g / min, adds about 0.6% ethanol with the speed of 3.5g / min simultaneously, 3.7%ETBE (massfraction, remaining part is water) circulating fluid. The plate number of the ethanol concentration tower is 16, and the reflux ratio is 3:1; the temperature at the top of the concentration tower is 75.7°C.

[0082] The ethanol concentrated liquid with a flow rate of 54.2 g / min and a purity of 83.6% (mass fraction) is obtained, and enters the azeotropic rectification tower, and the temperature at the top of the azeotropic rectification tower is controlled to be 65.5° C. The number of trays in the azeotropic rectification column is 22, and the flow rate of the added ETBE is 0.18 g / min; the azeotrope obtained at the top of the tower is condensed and enters the separatory tank.

[0083] The liquid separation tank is operated under normal pressure, a...

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Abstract

The invention provides an ethanol-water separation method which includes the steps: (1) performing azeotropy on hydrous ethanol raw materials and ethyl tert butyl ether at the temperature of 70-81 DEGC to obtain ethanol concentrate; (2) performing azeotropy on the ethanol concentrate and the ethyl tert butyl ether at the temperature of 63-68 DEG C and separating the ethanol concentrate and the ethyl tert butyl ether to obtain ethanol and H2O-ETBE azeotrope. According to the method, dilute ethanol is preliminarily concentrated, azeotropic dehydration is performed by the aid of the ethyl tert butyl ether to obtain the ethanol with the water content of hundreds of ppm, and the ethanol is used for blending ethanol gasoline.

Description

technical field [0001] The invention belongs to the field of separation and purification of chemical raw materials, and in particular relates to a method for separating ethanol-water. Background technique [0002] Methyl tert-butyl ether (MTBE) is a widely used oxygen-containing additive, which is mainly used to increase the octane number of gasoline and enhance the antiknock performance. The use of MTBE plays a positive role in reducing the emissions of air pollutants such as CO and hydrocarbons after combustion. Since MTBE was banned, the use of MTBE in the European Union and Japan is also decreasing year by year. Compared with MTBE, ethanol and ethyl tert-butyl ether (ETBE) have better advantages as high-octane components. Adding fuel ethanol to gasoline can greatly increase its octane number, and can effectively improve the antiknock performance of gasoline. At the same time, since the oxygen content of ethanol is as high as 34.7%, it can be added to gasoline in a les...

Claims

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Application Information

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IPC IPC(8): C07C31/08C07C29/82
CPCC07C29/82C07C31/08
Inventor 潘罗其杜建文刘洪武彭涛周小文余卫勋邓琼肖泽威
Owner CHINA PETROLEUM & CHEM CORP
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