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Method for alkali making by membrane crystallization

A technology of crystallization and membrane modules, which is applied in the field of alkali production and concentration of brine quality, can solve the problems of high cost, complex equipment, high cost of ion membrane, etc., and achieve the effect of reducing CO2 emissions and increasing value

Inactive Publication Date: 2012-06-13
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Hou Debang's joint soda production technology once created a miracle in my country's ammonia soda production industry and the world's soda production industry, but the equipment is complex and the process route is long, which was gradually replaced by the subsequent ion membrane soda production technology
Ionic membrane soda production technology (chlor-alkali chemical industry) is a new set of soda production technology, which uses perfluorosulfonic acid ion exchange membrane as the electrolysis solution to prepare caustic soda, but the cost of ionic membrane is very high, and the current ionic membrane technology has not yet been adopted my country has fully grasped it, only a few companies in the world such as DuPont of the United States, Asahi Kasei of Japan and other companies monopolize it, and the cost is relatively high

Method used

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  • Method for alkali making by membrane crystallization
  • Method for alkali making by membrane crystallization
  • Method for alkali making by membrane crystallization

Examples

Experimental program
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Embodiment 1

[0024] Taking the concentration treatment of KCl-containing water as an example, the specific steps are:

[0025] 1. Membrane crystallization process.

[0026] The film crystallization device consists of figure 1 Shown:

[0027] The feed liquid in the liquid storage tank 1 heated by a constant temperature water bath passes through the infusion pump 2, passes through the rotameter 3, the pressure gauge 4, and the thermometer 5 (used to record the flow rate, pressure and temperature before the feed liquid enters the membrane module) and reaches the The membrane module 7 of the modified ceramic membrane; after the vacuum pump 9 is turned on, a part of the evaporated feed liquid passes through the micropores of the ceramic membrane, is drawn by the vacuum pump 9 into the serpentine condenser tube 8, and enters the collection bottle 6 after cooling; the other part of the feed liquid It flows out from the membrane module 7 and returns to the liquid storage tank 1, so that the feed...

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Abstract

The invention relates to a method for alkali making by membrane crystallization. The method utilizes a membrane crystallization technology for concentration and salt making. Organic amine and CO2 are adopted to convert salt to alkali so as to increase the added value. Meanwhile, CO2 is utilized in the conversion process, thus being in favor of the emission reduction of CO2. And organic amine is recyclable, so that the cost of the whole process can be low.

Description

【Technical field】 [0001] The invention relates to the technical field of concentration and soda production of saline water, in particular to a combined treatment method of concentration and soda production of saline water. 【Background technique】 [0002] Currently saline quality (or brine concentration) treatment and CO 2 Emission reduction is a common problem for enterprises and society. Saline quality (or concentrated brine) is difficult to deal with in general methods, let alone make it value-added, CO 2 Emissions will cause a serious greenhouse effect and affect our living environment. The implementation of this project can solve the discharge of saline quality (or brine concentration) and CO 2 Emission reduction provides a new way of thinking and a method that can be used for reference. [0003] Membrane crystallization is a new type of technology coupled with membrane distillation and crystallization. It uses the principle of membrane distillation to remove solvent ...

Claims

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Application Information

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IPC IPC(8): C01D7/00
Inventor 杨座国
Owner EAST CHINA UNIV OF SCI & TECH
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