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Technology and device for producing high-purity ethyl alcohol

An ethanol, high-purity technology, applied in the chemical industry, can solve the problems of reducing the adsorption efficiency of molecular sieves, destroying the lattice structure of molecular sieves, and high energy consumption of molecular sieves

Active Publication Date: 2016-03-23
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology is not suitable for dehydration of solvents with higher water content, because too high water content will lead to high energy consumption during molecular sieve regeneration, and will also lead to molecular sieve pulverization, resulting in damage to the molecular sieve lattice structure, greatly reducing the adsorption efficiency of molecular sieves. Molecular sieve powder may be brought into the finished product, affecting the quality of the finished product

Method used

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  • Technology and device for producing high-purity ethyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1 Shown, the low-concentration ethanol mother liquor of ethanol content 20wt.% enters the top of low-pressure rectification tower 2 after the tower bottom liquid of low-pressure rectification tower 2, tower top crude distillate steam preheating, after rectification, tower still obtains Residue, steam with an ethanol content of 50wt.% is obtained at the top of the tower, and the steam is used to preheat the raw materials. The steam after the preheated raw materials enters the pressurized rectification tower 6. After rectification, the ethanol content of the tower reactor is ≤0.1 wt.% waste water, ethanol content 80wt.% positive pressure stream steam is obtained at the top of the tower, the positive pressure ethanol stream is divided into two streams, the mass ratio of the two streams returning to the pressurized rectification tower and entering the pervaporation membrane is 2:1, The stream returning to the pressurized rectification tower exchanges heat wit...

Embodiment 2

[0050] Such as figure 1 Shown, the low-concentration ethanol mother liquor of ethanol content 25wt.% enters the top of low-pressure rectification tower 2 after the tower bottom liquid of low-pressure rectification tower 2, tower top crude distillate steam preheating, after rectification, tower still obtains Residue, steam with an ethanol content of 57wt.% is obtained at the top of the tower, and the steam is used to preheat the raw materials. The steam after the preheated raw materials enters the pressurized rectification tower 6. After rectification, the ethanol content of the tower reactor is ≤0.1 wt.% waste water, ethanol content 85wt.% positive pressure stream steam is obtained at the top of the tower, the positive pressure ethanol stream is divided into two streams, the mass ratio of the two streams returning to the pressurized rectification tower and entering the pervaporation membrane is 3:1, The stream returning to the pressurized rectification tower exchanges heat wit...

Embodiment 3

[0053] The difference from Example 2 is that the permeate from the pervaporation membrane 8 can also be returned to the pressurized rectification column 6 for feeding.

[0054] Such as figure 1 Shown, the low-concentration ethanol mother liquor of ethanol content 25wt.% enters the top of low-pressure rectification tower 2 after the tower bottom liquid of low-pressure rectification tower 2, tower top crude distillate steam preheating, after rectification, tower still obtains Residue, steam with an ethanol content of 62wt.% is obtained at the top of the tower, and the steam is used to preheat the raw materials. The steam after preheating the raw materials enters the pressurized rectification tower 6. After rectification, the ethanol content of the tower reactor is ≤0.1 wt.% waste water, ethanol content 87wt.% positive pressure stream steam is obtained at the top of the tower, the positive pressure ethanol stream is divided into two streams, and the mass ratio of the two streams ...

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Abstract

The invention relates to a technological method for preparing high-purity ethyl alcohol through two-tower differential pressure rectification-film equipment-molecular sieve adsorption tower coupling. The technological method is mainly used for solving the problem that an existing high-purity ethyl alcohol production technology is high in energy consumption and not high in purity. Two rectification towers, a film and two molecular sieve adsorption towers are included, and the technological method mainly comprises the steps that 1, low-concentration ethyl alcohol raw materials are used as decompression rectification tower feed after being preheated through decompression rectification tower bottoms and tower top alcohol logistics steam in sequence, the tower top alcohol logistics steam enters the pressurization rectification tower after raw material condensation is carried out, ethyl alcohol positive pressure steam is obtained on the top of the pressurization rectification tower, and bottom residual liquid is obtained on the tower bottom; 2, the ethyl alcohol positive pressure steam enters film equipment and is separated through a film assembly, ethyl alcohol steam is located on a film outlet, and penetrating fluid containing a small amount of ethyl alcohol is located on the negative pressure side; 3, the ethyl alcohol steam on the film outlet enters the molecular sieve adsorption towers, and the high-purity ethyl alcohol is obtained. The penetrating fluid on the negative pressure side of the film equipment and a dilute solution reproduced through the molecular sieve adsorption towers can be returned back to the decompression rectification tower.

Description

technical field [0001] The invention relates to a process and a device for producing high-purity ethanol, belonging to the technical field of chemical industry. Background technique [0002] High-purity ethanol has a wide range of uses, such as ultra-clean cleaning and drying in the processing of precision electronic components, ultra-clean cleaning of equipment in purification rooms, scientific experiments, and important solvents in the pharmaceutical and chemical industries. However, ethanol and water form an azeotrope, using a This technology is difficult to obtain high-purity ethanol. [0003] At present, ethanol dehydration methods mainly include rectification. Azeotropic rectification and extractive rectification can obtain anhydrous or high-purity ethanol, but these two processes have high energy consumption, and both need to add a third component, which increases the cost and at the same time It also increases the environmental protection pressure of enterprises. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/76C07C31/08
CPCC07C29/76C07C31/08
Inventor 余从立孔维芳尤丽荣纪祖焕
Owner JIANGSU NINE HEAVEN HIGH TECH
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