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Method and device for preparing sodium bicarbonate by electrochemically capturing carbon dioxide

A technology of carbon dioxide and sodium bicarbonate, applied in the field of flue gas purification, can solve the problems of difficult control of the quality of the decarbonization by-product calcium carbonate, environmental risks, etc., and achieve the effects of fast reaction rate, high removal efficiency and simple process

Pending Publication Date: 2021-03-16
PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is simple and easy to operate, and the cost of use is relatively low, but the quality of a large amount of decarbonized by-product calcium carbonate will be difficult to control, and improper follow-up treatment will cause new environmental risks

Method used

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  • Method and device for preparing sodium bicarbonate by electrochemically capturing carbon dioxide
  • Method and device for preparing sodium bicarbonate by electrochemically capturing carbon dioxide
  • Method and device for preparing sodium bicarbonate by electrochemically capturing carbon dioxide

Examples

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Embodiment 1

[0032] A method for electrochemically capturing carbon dioxide to prepare sodium bicarbonate, the specific operations are as follows:

[0033] (1) At room temperature, the reaction chamber is divided into cathode chamber 2 and anode chamber 1 by cation exchange membrane 5, wherein the anode injects the desulfurization by-product (NaHSO of about 0.1mol / L 4 ), the cathode chamber 2 is injected with a NaOH solution of 0.5mol / L concentration, and under the action of the electric field drive and the cation exchange membrane 5, the cation Na + Selectively enter the cathode chamber 2, and the OH produced by the electrolysis of water in the cathode chamber 2 - Combined to generate NaOH, the H produced by the electrolysis of water in the anode chamber 1 + Combine with anion to form H 2 SO 4 .

[0034] (2) At the same time, the gas containing 10% carbon dioxide after dedusting, desulfurization and denitrification is introduced from the gas inlet 17 at the bottom of the cathode chamb...

Embodiment 2

[0038] A method for electrochemically capturing carbon dioxide to prepare sodium bicarbonate, the specific operations are as follows:

[0039] (1) At room temperature, the reaction chamber is divided into cathode chamber 2 and anode chamber 1 by cation exchange membrane 5, wherein the anode injects the desulfurization by-product (about 0.5mol / L Na 2 SO 3 ), the cathode chamber 2 is injected with a NaOH solution with a concentration of 0.5mol / L, and 1A / m is applied between the anode and the cathode 2 DC constant current, electrode materials are graphite plates. Driven by the electric field and under the action of the cation exchange membrane 5, the cation Na + Selectively enter the cathode chamber 2, and the OH produced by the electrolysis of water in the cathode chamber 2 - combined to form NaOH, SO in the anode compartment 1 3 2- is oxidized to SO 3 2- , and the H produced by electrolysis of water + Combine with anion to form H 2 SO 4 .

[0040] (2) At the same tim...

Embodiment 3

[0044] A method for electrochemically capturing carbon dioxide to prepare sodium bicarbonate, the specific operations are as follows:

[0045] (1) At room temperature, the reaction chamber is divided into cathode chamber 2 and anode chamber 1 by cation exchange membrane 5, wherein the anode injects the desulfurization by-product (0.1mol / L Na 2 SO 4 ), the cathode chamber 2 is injected with a NaOH solution with a concentration of 0.5mol / L, and 1A / m is applied between the anode and the cathode 2 DC constant current, electrode materials are graphite plates. Driven by the electric field and under the action of the cation exchange membrane 5, the cation Na + Selectively enter the cathode chamber 2, and the OH produced by the electrolysis of water in the cathode chamber 2 - Combined to generate NaOH, the H produced by the electrolysis of water in the anode chamber 1 + Combine with anion to form H 2 SO 4 .

[0046] (2) At the same time, the gas containing 20% ​​carbon dioxide ...

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Abstract

The invention belongs to the field of flue gas purification, and discloses a method for preparing sodium bicarbonate by electrochemically capturing carbon dioxide. The method comprises the following steps: with NaHSO4, Na2SO4, Na2SO3 and other desulfurization products as raw materials, enabling Na<+> to enter a cathode chamber under the actions of electric field driving and an ion exchange membrane to generate NaOH, controlling a pH value through an electrochemical process, capturing CO2 in the flue gas, and converting the CO2 into NaHCO3. Compared with the prior art, the method of the invention is simple in process, green and economical, and CO2 is captured through desulfurization by-products so as to realize treatment of the waste with the waste; and meanwhile, a decarburization target product NaHCO3 is a good desulfurizing agent, has the characteristics of high removal efficiency, high reaction rate and the like, and can realize virtuous cycle of desulfurization and decarburization.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a method and device for preparing sodium bicarbonate by electrochemically capturing carbon dioxide. Background technique [0002] CO 2 、CH 4 , N 2 O, O 3 The emission of greenhouse gases such as chlorofluorocarbons (CFCs) is considered to be the main cause of global warming, among which CO 2 Emissions account for 70% of all greenhouse gas emissions. In many CO 2 Among the emission sources, CO emissions from energy utilization processes dominated by fossil fuels 2 occupy an absolute dominant position. The greenhouse effect will lead to global sea level rise, reduction of fresh water resources, extreme climate, threats to human health, and serious damage to global ecosystems. At the 2015 Paris Climate Change Conference, an agreement was reached on the ultimate goal of climate containment, limiting global warming to within 2°C. In 2016, China joined the Paris A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/07C25B1/01C25B1/16
CPCC01D7/07C25B1/16C25B1/00
Inventor 宁平李波李凯宋辛李斌李婵刘小艳李幸
Owner PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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