Method and system for realizing hydrogen production, organic matter oxidation, carbon dioxide absorption-desorption and hydroxide regeneration

A hydroxide and carbon dioxide technology, applied in the field of hydrogen production, carbon dioxide absorption-desorption, hydroxide regeneration, and organic oxidation, can solve the problems of difficult separation, single function, desorption, and low separation efficiency

Active Publication Date: 2021-10-26
BEIJING UNIV OF CHEM TECH
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  • Abstract
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Problems solved by technology

However, the value product in this method is still only H 2 , and the process anode O 2 and cathode H 2 Co-produced, there are potential safety hazards, and the gas phase product of the anode in the process is CO 2 and O 2 The mixed gas, subsequent separation is difficult, CO 2 Low desorption efficiency
[0005] In short, the current electrolytic hydrogen production process has a single function, fewer valuable products, and CO 2 The efficiency of desorption and separation is low, and the comprehensive cost of hydrogen is relatively high

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  • Method and system for realizing hydrogen production, organic matter oxidation, carbon dioxide absorption-desorption and hydroxide regeneration

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Embodiment 1

[0065] The aqueous solution containing potassium carbonate and glycerol is used as the anode liquid (concentration of potassium carbonate is 2.5mol / L, and the concentration of glycerin is 1.2mol / L), and the potassium hydroxide solution (concentration is 6mol / L) is used as the cathode liquid, and the anode The liquid and the cathode feed liquid are respectively passed into the anode chamber and the cathode chamber of the electrolytic cell for electrolysis, and the current density is 3000A / m 2 , the oxidation reaction of glycerol at the anode mainly forms dihydroxyacetone, while potassium carbonate is converted to potassium bicarbonate and CO 2 ; A hydrogen evolution reaction occurs at the cathode, producing H 2 and KOH;

[0066] The concentration of potassium hydroxide in the cathode effluent rises to 7-7.8mol / L, 20% is diluted with water to 6mol / L, and returned to the cathode influent, and 80% is diluted with water to 5.0-5.1mol / L for CO 2 capture absorption.

[0067] Use 5...

Embodiment 2

[0070] The aqueous solution containing sodium carbonate and glucose is used as the anode liquid (the concentration of sodium carbonate is 1.5 mol / L, and the concentration of glucose is 1 mol / L), and the sodium hydroxide solution (the concentration is 6 mol / L) is used as the cathode liquid, and the anolyte is and the cathode liquid are respectively passed into the anode chamber and cathode chamber of the electrolytic cell for electrolysis, and the current density is 1500A / m 2 , the oxidation reaction of glucose at the anode mainly forms gluconic acid, and at the same time forms NaHCO 3 , and release CO 2 gas; a hydrogen evolution reaction occurs at the cathode, producing H 2 and NaOH.

[0071] The concentration of sodium hydroxide in the cathodic effluent rises to 3.2-4mol / L, and 10% of the cathodic effluent is diluted with water to 2 mol / L, and returned to the cathode influent, and 90% of the cathodic effluent is diluted with water to 2.9-3mol / L. in CO 2 capture absorption...

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Abstract

The invention relates to the technical field of electrochemical hydrogen production, and provides a method and system for realizing hydrogen production, organic matter oxidation, carbon dioxide absorption-desorption and hydroxide regeneration. An aqueous solution containing carbonate and water-soluble organic matter serves as anode inlet liquid, and water or a hydroxide solution serves as cathode inlet liquid for electrolysis; value-added oxides, bicarbonate and CO2 are generated at an anode, and hydrogen and hydroxides are generated at a cathode; value-added oxides in anode effluent are separated, and a residual solution is subjected to heat treatment to obtain a carbonate solution and CO2; and a part of cathode effluent is used as a cathode inlet liquid for backflow, and a part of the cathode effluent is used as an absorption liquid for trapping low-concentration CO2. According to the method, electrochemical coupling of hydrogen production, organic matter oxidation, carbon dioxide capture-desorption and hydroxide regeneration can be achieved, the value-added oxides can be obtained while hydrogen is obtained, carbon dioxide capture-desorption and hydroxide regeneration are achieved, the comprehensive preparation cost of hydrogen is reduced, and multi-functionalization of the electrolysis process is achieved.

Description

technical field [0001] The invention relates to the technical field of electrochemical hydrogen production, in particular to a method and system for realizing hydrogen production, organic matter oxidation, carbon dioxide absorption-desorption and hydroxide regeneration. Background technique [0002] Clean and green hydrogen energy, carbon capture, and organic chemical technology are the key elements to achieve carbon peak, carbon neutral and sustainable social development. [0003] Hydrogen production by electrolysis of water is a green and convenient method to produce hydrogen, and will become the main way to obtain hydrogen energy in the future. However, the traditional electrolytic water hydrogen production function is too single, the valuable product is only hydrogen, and the comprehensive cost of hydrogen production is relatively high. [0004] Patents CN101043929A and CN101249976A report that hydrogen can be obtained by electrolysis of sodium carbonate solution, oxyge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/01C25B1/02C25B1/14C25B1/16C25B3/07C25B3/23C25B9/19
CPCC25B1/01C25B1/02C25B1/16C25B1/14C25B3/07C25B3/23C25B9/19
Inventor 唐阳万平玉杨晓进邵明飞白智群
Owner BEIJING UNIV OF CHEM TECH
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