Method for realizing separation of potassium-rich solution through hydrochloric acid coproduced by utilizing membrane electrolysis technology to mineralize CO2

A technology of membrane electrolysis and catholyte, applied in the direction of electrolysis process, electrolysis components, etc., can solve the problems of small processing capacity, poor separation effect, high cost, etc., and achieve the effect of low energy consumption

Inactive Publication Date: 2014-08-06
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a CO 2 A new way to separate potassium and calcium through mineralization—a method of using membrane electrolysis technology to mineralize CO2 and co-produce hydrochloric acid to realize the separation of potassium-rich solution, so as to solve the problems of high cost, poor separation effect and processing capacity faced by the existing potassium and calcium separation process Minor problems, so as to realize the sepa

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  • Method for realizing separation of potassium-rich solution through hydrochloric acid coproduced by utilizing membrane electrolysis technology to mineralize CO2

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Embodiment 1

[0022] The mineralization process of the present embodiment is as attached figure 1 shown. The electrolytic cell is divided into two areas, the anode area and the cathode area, by the anion exchange membrane 2 which only allows the anion to pass through but can prevent the cation from passing through. Add 0.3mol / L HCl solution to the anode electrolyzer as the anolyte, and add calcium chloride concentration of 1mol / L and potassium chloride concentration of 1.2mol / L to the cathode electrolyzer through the potassium-rich solution storage tank 4 The potassium-rich solution acts as the catholyte and is the starting material for the electrolysis reaction. A gas diffusion electrode is used as the anode electrode 1 , and a metal nickel electrode is used as the cathode electrode 3 . will CO 2 The gas is passed into the cathode area by bubbling from the bottom of the electrolytic cell, and the hydrogen gas generated by the cathode electrode is collected and entered into the buffer ta...

Embodiment 2

[0024] The mineralization process of the present embodiment is as attached figure 1 shown. The electrolytic cell is divided into two areas, positive and negative, by an anion exchange membrane 2 that only allows the penetration of anions but prevents the penetration of cations. Add 0.5 mol / L HCl solution to the anode electrolyzer as the anolyte, add a potassium-rich solution with a calcium chloride concentration of 2 mol / L and a potassium chloride concentration of 1 mol / L as the catholyte and the raw material for the electrolysis reaction. A hydrogen diffusion electrode is used as the anode electrode 1 , and a metal nickel electrode is used as the cathode electrode 3 . will CO 2 The gas is bubbled at the bottom of the electrolytic cell into the cathode area, and the hydrogen gas generated by the cathode electrode is collected and entered into the buffer tank 5. The hydrogen gas from the buffer tank is passed into the gas diffusion electrode. Under these conditions, the elec...

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Abstract

The invention discloses a method for realizing separation of a potassium-rich solution through hydrochloric acid coproduced by utilizing membrane electrolysis technology to mineralize CO2. According to the method, diluted hydrochloric acid is added into an anodic area formed by using an anion exchange membrane to separate, the potassium-rich solution containing calcium chloride is added into the cathodic area, direct current is applied between an anode electrode and a cathode electrode, and chloride ions in a catholyte permeate the anion exchange membrane to reach the anodic area under the action of current, so as to combine with hydrogen ions, generated on the anode electrode through hydrogen oxidation, to generate hydrochloric acid; carbon dioxide is pumped into the catholyte to enable the carbon dioxide to be converted into carbonate, so as to enable the carbonate and calcium ions to generate a calcium carbonate precipitation, the hydrogen ions in the catholyte is reduced to be hydrogen on the cathode electrode, the calcium carbonate precipitation is removed out after the electrolysis reaction is completed, the precipitation is filtered and dried to obtain a high-purity calcium carbonate, and the filtrate is potassium chloride solution subjected to purification. According to the method, the mineralization of the carbon CO2 is realized under the conditions of low consumption and high raw material utilization, the production of the high-purity calcium carbonate is realized, and the separation of potassium ions and calcium ions in the potassium-rich solution is realized at the same time.

Description

technical field [0001] The invention relates to a mineralization emission reduction CO 2 method, especially a method for mineralizing CO using membrane electrolysis technology 2 A method for co-producing hydrochloric acid and separating calcium chloride from potassium-rich solution. technical background [0002] Climate warming is an undoubted fact, and more than 90% of the possibilities are caused by human activities. CO in the global atmosphere 2 The mass concentration has been changed from 280×10 before the industrial era -6 increased to 379×10 in 2005 -6 . Due to the gradual increase of global greenhouse gas emissions generated by human activities, the global temperature rises, the sea level rises, and there are more and more smog weather, which seriously endangers people's survival. 6 billion tCO per year must be reduced globally 2 emissions to prevent global warming. Atmospheric "greenhouse effect" and global warming will be the biggest environmental problems f...

Claims

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Application Information

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IPC IPC(8): C25B1/22C25B1/00
Inventor 谢和平刘涛王昱飞王金龙江文唐亮
Owner SICHUAN UNIV
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