A pervaporation rectification coupled system and a use thereof

A rectification coupling and pervaporation technology, which is applied in the system field of pervaporation and rectification coupling, can solve the problems that it is difficult to meet the requirements of extremely low moisture, increase investment and operation costs, and it is difficult to dehydrate to high-purity products. Save energy and cost, reduce equipment investment, and reduce energy consumption

Inactive Publication Date: 2014-09-10
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Many organic solvents can form azeotropic mixtures with water, and it is difficult to dehydrate to high-purity products by ordinary distillation
Traditional dehydration technologies such as azeotropic distillation and adsorption have great disadvantages, such as: (1) Azeotropic distillation is used to introduce the third component, and a large number of toxic and harmful solvents are used, which has caused damage to the environment and product quality. Great impact, while increasing investment and operating costs; (2) Adsorption method produces a large amount of waste liquid and waste residue, which puts forward extrem

Method used

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  • A pervaporation rectification coupled system and a use thereof
  • A pervaporation rectification coupled system and a use thereof
  • A pervaporation rectification coupled system and a use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] See figure 1 , a system coupled with pervaporation and rectification, comprising a raw material tank 1, a raw material pump 2, a preheater 3, a pervaporation membrane separator 5, a first rectification tower 8 and a second rectification tower 9, the raw material Tank 1, raw material pump 2, preheater 3 and pervaporation membrane separator 5 are connected successively. A second rectification column 9 is connected to the side. The top of the second rectification tower 9 and the top of the first rectification tower 8 are respectively connected with the raw material tank 1 . The pervaporation membrane separator 5 is composed of 4 NaA type membrane separators connected in series, and the permeation side of the pervaporation membrane separator 5 is also connected with a condenser 6 and a vacuum unit 7 to obtain sufficient water permeation partial pressure difference. An evaporator 4 is also connected between the preheater 3 and the pervaporation membrane separator 5 .

[0...

Embodiment 2

[0030] See figure 1 , the system pervaporation-rectification coupled process of embodiment 1 is used for the dehydration of butanone / water mixed solution, and the steps are as follows:

[0031] Butanone solution with a water content of 11wt.% and a flow rate of 500kg / h is transported from the raw material tank 1 to the preheater 3 through the raw material pump 2, and enters the evaporator 4 after being preheated by the product steam, and the raw material liquid is heated to above 135°C In the form of steam, it enters the pervaporation membrane separator 5 composed of 7 T-type molecular sieve membrane separators in series for dehydration and separation. The pressure of the retentate side of the membrane is controlled at a gauge pressure of 150-200kPa, and the absolute pressure of the permeate side is 3000-5000Pa. The permeate with a water content of 92.5wt.% enters the rectification tower 8 after being condensed, and a methyl ethyl ketone solution with a water content of about...

Embodiment 3

[0033] See figure 2 , a system coupled with pervaporation and rectification, comprising a raw material tank 1, a raw material pump 2, a preheater 3, a pervaporation membrane separator 4, a first rectification column 7 and a second rectification column 8, the raw material Tank 1, raw material pump 2, preheater 3 and pervaporation membrane separator 4 are connected in sequence, and the permeation side of the pervaporation membrane separator 4 is connected with a first rectification column 7, and the pervaporation membrane separator 4 retentates A second rectification column 8 is connected to the side. The top of the second rectification tower 8 and the top of the first rectification tower 7 are respectively connected with the raw material tank 1 . The pervaporation membrane separator 4 is composed of 12 PVA membrane separators connected in series. The permeation side of the pervaporation membrane separator 4 is also connected with a condenser 5 and a vacuum unit 6 to obtain s...

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Abstract

A pervaporation rectification coupled system is disclosed. A method of performing organic solvent dehydration by coupling pervaporation and rectification is also disclosed. The system and the method are especially suitable for deep dehydration of organic solvents easily forming azeotropes with water, and belong to the technical field of separation. The method includes processes of: feeding a water-containing organic solvent (with a water content generally larger than the water content of the azeotrope) into a pervaporation membrane separator to perform primary dehydration so as to break azeotropy, feeding the solvent into a rectification tower to perform deep dehydration, returning a water-containing component at the tower top to the membrane separator and dehydrating again. An anhydrous finished product is obtained from the tower bottom. The water content of the organic solvent obtained by the processes and the method is 0.01-1 wt%. Compared with the prior art, the processes are simple, the equipment investment is low, the energy consumption is low, the product quality is high, and production of organic solvents with extremely low water contents, which is out of the reach of various kinds of rectification and other chemical manners, is achieved.

Description

technical field [0001] The invention belongs to the field of fine chemical industry, and in particular relates to a system for coupling pervaporation and rectification and its application. Background technique [0002] Organic solvents are widely used in petrochemical, energy, biopharmaceutical, fine chemical and other industries, and dehydration of organic solvents is a key link in their production and recycling. Among them, organic solvents with low water content have always been the focus of scientific research and industrial production due to their increasingly wide application and extremely complicated preparation process. [0003] Many organic solvents can form azeotropic mixtures with water, and it is difficult to dehydrate to high-purity products by ordinary distillation. Traditional dehydration technologies such as azeotropic distillation and adsorption have great disadvantages, such as: (1) Azeotropic distillation is used to introduce the third component, and a la...

Claims

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Application Information

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IPC IPC(8): B01D3/14B01D61/36
Inventor 顾学红仲超余从立庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH
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