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Method for preparing basic magnesium carbonate and coproducing hydrochloric acid by mineralizing CO2 (carbon dioxide) via magnesium chloride

A technology of magnesium chloride and magnesium carbonate, applied in the direction of chlorine/hydrogen chloride, cells, electrolysis process, etc., can solve the problems of long process flow, long production cycle, large equipment investment, etc., and achieve the effect of simple process, short production cycle and large output

Inactive Publication Date: 2013-06-26
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a new CO 2 Utilization method - using magnesium chloride to mineralize CO 2 A method for preparing basic magnesium carbonate and co-producing hydrochloric acid to solve the problems of long process flow, high energy consumption, large equipment investment and long production cycle in the existing mineralization method, so as to realize the utilization of cheap magnesium chloride resource ore CO 2 Simultaneous output of basic magnesium carbonate and hydrochloric acid with high added value

Method used

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  • Method for preparing basic magnesium carbonate and coproducing hydrochloric acid by mineralizing CO2 (carbon dioxide) via magnesium chloride
  • Method for preparing basic magnesium carbonate and coproducing hydrochloric acid by mineralizing CO2 (carbon dioxide) via magnesium chloride

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Embodiment 1

[0029] The mineralization process of the present embodiment is as attached figure 1 shown. The electrolytic cell is divided into three parts: a positive electrode area, an intermediate area and a negative electrode area by a cation exchange membrane 2 which only allows cations to pass through but can prevent anions from passing through, and an anion exchange membrane 3 which only allows anions to pass through but can prevent cations from passing through. area. Add 2mol / L of H 2 SO 4 solution to the positive electrode electrolyzer as the positive electrode electrolyte, add 1.2mol / L of MgCl 2 The solution is used as the negative electrode electrolyte in the negative electrode electrolyzer, and the hydrochloric acid of 0.4mol / L is added in the intermediate chamber. The gas diffusion electrode 1 is used as the positive electrode, and the platinum electrode 4 is used as the negative electrode. The CO bubbled in at the bottom of the negative electrode electrolyzer 2 The flow r...

Embodiment 2

[0031] The mineralization process of the present embodiment is as attached figure 2 shown. The electrolytic cell is divided into positive and negative areas by an anion exchange membrane 3 that only allows anion to pass through but can prevent cation from passing through. Add 2 mol / L HCl solution to the positive electrode electrolytic cell as the positive electrode electrolyte, and add 2 mol / L MgCl2 solution to the negative electrode electrolytic cell as the negative electrode electrolyte. The metal titanium iridium electrode 6 is used as the positive electrode, and the metal nickel electrode 4 is used as the negative electrode. The CO bubbled in at the bottom of the negative electrode electrolyzer 2 The flow rate was 20 ml / min, and the electrolysis reaction was carried out at a voltage of 2.6 V for 1 h. Heat the liquid in the negative electrode electrolyzer to obtain 2 The mineralization product of basic magnesium carbonate solid. The current efficiency of producing bas...

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Abstract

The invention discloses a method for preparing basic magnesium carbonate and coproducing hydrochloric acid by mineralizing CO2 (carbon dioxide) via magnesium chloride. The method comprises the following steps: standing an anion-exchange membrane in an electrolytic bath and dividing into a positive electrode area and a negative electrode area; adding a conducting solution serving as a positive electrode electrolyte into the positive electrode area; adding a magnesium chloride solution serving as a negative electrode electrolyte into the negative electrode area; filling carbon dioxide gas; applying a direct current power supply between the positive electrode and the positive electrode; reducing a hydrogen ion in the negative electrode electrolyte to form hydrogen on the negative electrode; converting carbon dioxide in the negative electrode electrolyte to form a bicarbonate radical; enabling the chloride ion replaced when bicarbonate radical and magnesium chloride generate magnesium bicarbonate to reach the positive electrode area through the anion-exchange membrane under the action of current, and oxidizing the chloride ion to form chlorine on the positive electrode; carrying out a reaction on chlorine and hydrogen which are generated by the electrolysis to generate hydrochloric acid; moving out the magnesium bicarbonate generated by the electrolytic reaction in the negative electrode area; and heating, filtering and drying the magnesium bicarbonate, thereby obtaining the basic magnesium carbonate. According to the method, when the carbon dioxide is mineralized, the basic magnesium carbonate and hydrochloric acid which have high added values are generated at the same time.

Description

technical field [0001] The present invention relates to a CO 2 Mineralization emission reduction method, in particular to a method of utilizing magnesium chloride to mineralize CO 2 A method for preparing basic magnesium carbonate and co-producing hydrochloric acid. technical background [0002] According to statistics from the International Energy Agency (IEA, 2008), China's energy consumption in 2006 resulted in CO 2 Emissions amounted to 5.6 billion tons, accounting for 20% of the world's total (28 billion tons). Looking into the future, rapid economic development and a coal-based energy structure will lead to my country's CO 2 Emissions will increase further, so our country will face more and more severe pressure from various aspects. In recent years, extreme weather such as snow disasters, extreme heat, and rainstorms have occurred frequently, and countries are suffering huge disasters brought about by the greenhouse effect. Facing such a severe environmental situat...

Claims

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Application Information

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IPC IPC(8): C25B1/18C25B1/26C25B9/08C01B7/01C25B9/19
Inventor 王昱飞谢和平刘涛王金龙
Owner SICHUAN UNIV
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