Ethanol, acetone and n-butanol salting-out composite rectification separation recovery method and apparatus

A rectification separation and n-butanol technology, applied in the separation/purification of hydroxyl compounds, carbonyl compounds, organic chemistry, etc., can solve the problem of low total solvent concentration, many impurities, and n-butanol in separation / water azeotrope and other problems, to achieve the effect of high solubility, good stability and easy recovery

Active Publication Date: 2014-10-08
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at problems such as low total solvent concentration in fermentation, many impurities contained, n-butanol / water azeotrope in subsequent separation, etc., and provides an ethanol, which can effectively reduce the formation of azeotrope between n-butanol and water, save energy and reduce emissions. Salting-out composite rectification separation and recovery method of acetone and n-butanol

Method used

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  • Ethanol, acetone and n-butanol salting-out composite rectification separation recovery method and apparatus
  • Ethanol, acetone and n-butanol salting-out composite rectification separation recovery method and apparatus
  • Ethanol, acetone and n-butanol salting-out composite rectification separation recovery method and apparatus

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Embodiment 1

[0043] A salting-out composite rectification separation and recovery method for ethanol, acetone and n-butanol, comprising the steps of:

[0044] a) The cooked fermented mash is degassed (to remove CO 2 and H 2 ) after, it is sent into the beer tower 1 to carry out the concentration of the total solvent, and realize the separation of glucose, protein and solids etc. simultaneously. The composition of fermented mash is 95.0% water, 1.08% n-butanol, 0.54% acetone, 0.18% ethanol, and the rest are impurities such as glucose, protein and solids. After the fermented mash is preheated to a temperature of 85°C to 90°C, it is pumped into the middle of the mash tower 1 with a feed rate of 25,000kg / h. The bottom of the tower is heated by direct steam, and the pressure at the bottom of the tower is 2×10 4 ~3×10 4Pa, the temperature at the bottom of the tower is 106-108°C, the liquid level at the bottom of the tower is controlled at 1 / 2-2 / 3; the temperature at the top of the tower is 9...

Embodiment 2

[0051] A salting-out composite rectification separation and recovery method for ethanol, acetone and n-butanol, comprising the steps of:

[0052] a) The cooked fermented mash is degassed (to remove CO 2 and H 2 ) after, it is sent into the beer tower 1 to carry out the concentration of the total solvent, and realize the separation of glucose, protein and solids etc. simultaneously. The composition of fermented mash is 96.0% water, 1.08% n-butanol, 0.55% acetone, 0.17% ethanol, and the rest are impurities such as glucose, protein and solids. After the fermented mash is preheated to a temperature of 85°C to 90°C, it is pumped into the middle of the mash tower 1 with a feed rate of 25,000kg / h. The bottom of the tower is heated by direct steam, and the pressure at the bottom of the tower is 2×10 4 ~3×10 4 Pa, the temperature at the bottom of the tower is 106-108°C, the liquid level at the bottom of the tower is controlled at 1 / 2-2 / 3; the temperature at the top of the tower is ...

Embodiment 3

[0059] A salting-out composite rectification separation and recovery method for ethanol, acetone and n-butanol, comprising the steps of:

[0060] a) The cooked fermented mash is degassed (to remove CO 2 and H 2 ) after, it is sent into the beer tower 1 to carry out the concentration of the total solvent, and realize the separation of glucose, protein and solids etc. simultaneously. The composition of fermented mash is 94.0% water, 1.09% n-butanol, 0.54% acetone, 0.17% ethanol, and the rest are impurities such as glucose, protein and solids. After the fermented mash is preheated to a temperature of 85°C to 90°C, it is pumped into the middle of the mash tower 1 with a feed rate of 25,000kg / h. The bottom of the tower is heated by direct steam, and the pressure at the bottom of the tower is 2×10 4 ~3×10 4 Pa, the temperature at the bottom of the tower is 106-108°C, the liquid level at the bottom of the tower is controlled at 1 / 2-2 / 3; the temperature at the top of the tower is ...

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Abstract

The invention discloses an ethanol, acetone and n-butanol salting-out composite rectification separation recovery method and apparatus. According to the method, a biological n-butanol fermentation broth is delivered into a mash tower, and preliminary concentration is carried out. Waste mash liquid is discharged from the bottom of the tower, and crude alcohol is obtained at the tower top. The crude alcohol is directly subject to counter-current salting-out extraction with a salt solution in a salting-out tower, wherein a volume ratio of the salt solution to the crude alcohol is (0.1-5):1, and an extraction temperature is 60-90 DEG C. A tower-top feed liquid is composed of a gas-phase discharged feed and a liquid-phase discharged feed. The gas-phase discharged feed directly enters an acetone tower, and the liquid-phase discharged feed directly enters n-butanol. Bottom raffinate of the salting-out tower is evaporated and re-used. Through sequential separations of an n-butanol tower, the acetone-tower and an ethanol tower, the contents of obtained n-butanol, acetone and ethanol are respectively no less than 99.8%, 99%, and 95.1%. With the method, an n-butanol separation purification process is simpler; total solvent separation recovery efficiency is improved; and energy consumption is reduced.

Description

technical field [0001] The present invention relates to a method and device for separation and recovery of a mixed solution of ethanol, acetone, n-butanol and water, in particular to a method and device for separation and recovery of ethanol, acetone and n-butanol by salting out, compound rectification, and separation; it belongs to chemical separation technology field. Background technique [0002] Butanol, acetone and ethanol are good organic solvents and important chemical raw materials. N-butanol is a solvent for various coatings and a raw material for making plasticizer dibutyl phthalate and extractant tributyl phosphate. Acetone is an important raw material for organic synthesis, used in the production of plexiglass, polycarbonate, epoxy resin, medicine, pesticides, etc. Ethanol can be used as a solvent and a raw material for organic synthesis. Butanol, acetone and ethanol can all be produced synthetically or by fermentation. The development of the oil industry onc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/08C07C45/78C07C31/08C07C31/12C07C29/76
CPCC07C29/76C07C45/78C07C49/08C07C31/08C07C31/12
Inventor 邱学青谢绍朐易聪华楼宏铭杨东杰
Owner SOUTH CHINA UNIV OF TECH
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