Ethyl alcohol production method and device

A production method and technology for a production device are applied in the field of ethanol production methods and devices, and can solve the problems of complex process, pollution and high energy consumption

Pending Publication Date: 2018-05-29
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the azeotropic point of ethanol and water, the traditional method cannot directly obtain anhydrous ethanol
At present, the production of industrial anhydrous ethanol mainly adopts methods such as azeotropic distillation, extractive distillation and adsorption separation. These traditional ethanol dehydration methods have problems such as complicated process, high energy consumption and serious pollution.

Method used

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  • Ethyl alcohol production method and device
  • Ethyl alcohol production method and device
  • Ethyl alcohol production method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 Shown, taking syngas (containing 65wt%H 2 , 30wt% CO) directly synthesize ethanol under the Cu-Co catalyst system, and the reaction product is separated by non-condensable gas to obtain steam containing 62wt% ethanol, 20wt% methanol, and 13wt% water, which is sent to the rectification tower for rectification , the pressure inside the rectification tower is 300kPa, the temperature at the bottom of the tower is 86°C, and the temperature at the top of the tower is 74°C. Methanol is extracted from the top of the tower, and ethanol (water content 8wt%) is extracted from the side line. After heat exchange and superheating, the material extracted from the side line , into the steam permeable membrane for dehydration, the steam permeable membrane is made of NaA molecular sieve membrane, the temperature of the feed liquid side is 114°C, the absolute pressure of the feed liquid side is 120kPa, the absolute pressure of the permeation side is 1000Pa, and the averag...

Embodiment 2

[0032] Such as figure 2 Shown, taking syngas (containing 65wt%H 2 , 30wt%CO) as a carbon source, using the fermentation method to produce ethanol (CN105755058A), the fermentation liquid is filtered to remove bacteria, and then sent to a rectification tower for rectification. The pressure inside the rectification tower is 300kPa, and the temperature at the bottom of the tower is 88 ℃, the temperature at the top of the tower is 78°C, ethanol (water content 16wt%) is extracted from the top of the tower, and the material extracted from the side line is heat exchanged and overheated, and then sent to the steam permeable membrane for dehydration. The steam permeable membrane uses NaA molecular sieve Membrane, feed liquid side temperature 110°C, feed liquid side absolute pressure 150kPa, permeation side absolute pressure 1500Pa, steam permeation membrane average water flux 0.98kg / m 2 h, the permeate side obtains an ethanol product with a water content of 0.8wt%.

Embodiment 3

[0034] Such as figure 2 Shown, taking syngas (containing 65wt%H 2 , 30wt%CO) to generate dimethyl ether (CH 3 OCH 3 ), carbonylation of dimethyl ether to generate methyl acetate, methyl acetate is hydrogenated under the action of a catalyst to produce methanol and ethanol (CN104710282A), and the product containing 54wt% methanol, 34wt% ethanol and 9wt% methyl acetate is sent to the refining Carry out rectification in the distillation tower, the pressure in the rectification tower is 350kPa, the temperature at the bottom of the tower is 88°C, and the temperature at the top of the tower is 76°C. Methanol is extracted from the top of the tower, and ethanol (water content 1.2wt%) is extracted from the side line. After heat exchange and overheating, the material is sent to the steam permeable membrane for dehydration. The steam permeable membrane is made of NaA molecular sieve membrane. Average water flux 0.93kg / m 2 h, the permeate side obtains an ethanol product with a water ...

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Abstract

The invention relates to a new technology for adopting rectifying-membrane equipment for dehydration in preparing ethyl alcohol through synthesis gas. The technology is composed of rectifying columnsand vapor-permeation and water-permeation membrane. The technology mainly comprises the following steps that 1, synthesis gas is subjected to multi-step reactions to obtain a reaction product containing ethyl alcohol and water, before entering the vapor-permeation and water-permeation membrane, the reaction product is separated in the rectifying columns, and ethyl alcohol vapor containing 0.1-30%of water is collected from the top or the lateral line of the final rectifying column; 2, the ethyl alcohol vapor containing water enters the membrane equipment after passing through heat or a heat pump, and through separation of a membrane assembly, the membrane outlet (the positive pressure side) contains the finished product of ethyl alcohol containing 0.1-1% of water.

Description

technical field [0001] The invention relates to an ethanol production method and device, in particular to a dehydration process and device for preparing ethanol from synthesis gas. Background technique [0002] Ethanol is widely used in national defense chemical industry, medical and health, food industry, industrial and agricultural production. Ethanol production methods include biological fermentation and chemical synthesis. Among them, the production technology of syngas to ethanol in the chemical synthesis method is mature, and the production cost is significantly lower than that of the grain route, which has strong competitiveness and broad development prospects. There are three ways to produce ethanol from syngas, one is to produce ethanol directly from syngas; the other is to produce ethanol through biological method of syngas; Regardless of the ethanol production method, aqueous ethanol is obtained. Due to the azeotropic point of ethanol and water, the tradition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/151C07C29/74C07C29/80C07C29/84C07C29/78C07C31/08C12P7/06B01D3/14B01D3/32B01D61/36
CPCB01D3/14B01D3/322B01D61/362B01D61/366C12P7/06C07C29/151C07C29/74C07C29/78C07C29/80C07C29/84C07C31/08Y02P20/129Y02E50/10
Inventor 余从立相里粉娟张艳男翁国先庆天
Owner JIANGSU NINE HEAVEN HIGH TECH
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