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Method for producing two alkalis and co-producing high-purity gypsum with mirabilite and limestone by pcet reaction

A limestone and reaction technology, applied in electrolytic components, electrodes, calcium/strontium/barium sulfate, etc., can solve the problems of high emissions, high environmental pressure, and high operational risks, to increase feasibility and safety, avoid production and Circulation, the effect of reducing manufacturing costs

Active Publication Date: 2021-04-23
王昱飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problems faced by caustic soda production mainly include: (1) high energy consumption for electrolysis: during the electrolysis process, the cathode and anode will continuously produce hydrogen and chlorine, and its theoretical potential is as high as 2.172V. In actual industrial production, the electrolysis voltage is as high as 3V Above, the DC power consumption reaches 2200kWh / t-NaOH, accounting for more than 80% of the total energy consumption of caustic soda production
(2) High risk of operation: liquid chlorine and chlorine gas belong to the first batch of hazardous chemicals under key supervision. Even under strict regulatory policies, safety accidents caused by chlorine gas still emerge in endlessly
(3) Environmental protection pressure is high: chlorine gas, as a highly toxic gas, is the largest by-product of the ion-exchange membrane caustic soda industry, and 0.89 tons of chlorine gas is produced by producing 1 ton of caustic soda
This has brought about many environmental problems: 1. For every ton of chlorine gas produced, 20kg of chlorine-containing waste sulfuric acid will be produced, which has a high environmental risk; The emission concentration limit is changed from 65mg / m 3 reduced to 5mg / m 3 , greatly increasing the cost of environmental protection operation; 3. In the long run, the downstream market of chlorine gas cannot match the production volume of chlorine gas
However, with the development of chemical technology, especially electrochemical technology, and the enhancement of human awareness of environmental protection, economic and environmental problems such as high energy consumption, high emissions, and high safety risks in the two-alkali manufacturing process have become more prominent, which has seriously restricted the development of the two-alkali industry. Further development

Method used

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  • Method for producing two alkalis and co-producing high-purity gypsum with mirabilite and limestone by pcet reaction
  • Method for producing two alkalis and co-producing high-purity gypsum with mirabilite and limestone by pcet reaction
  • Method for producing two alkalis and co-producing high-purity gypsum with mirabilite and limestone by pcet reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] In this embodiment, the process of producing soda ash and co-producing high-purity gypsum with Glauber's salt and limestone by PCET reaction is as follows:

[0090] The cation exchange membrane is placed in the electrolytic cell and the electrolytic cell is divided into an anode area and a cathode area. The anode area adds 50ml sodium acetate solution (concentration is 2M) as the anolyte, and the cathode area adds 50ml sodium carbonate (concentration is 3M). Bubble CO into the cathode area at a rate of 10ml / min 2 Gas for 5 minutes, the electrolyte is continuously circulated into the electrode chamber of the electrolytic cell by a peristaltic pump at a flow rate of 20mL / min, and 0.3mol / L riboflavin-5-phosphate (FMN, ) as the cathode electrocatalyst, adding 0.3mol / L reduced riboflavin (FMNH 2 , ) as the anode electrocatalyst, and a DC power supply (IT6932A, Itech) was applied between the anode electrode and the cathode electrode to provide the current.

[0091] Among...

Embodiment 2

[0100] In this embodiment, the process of producing soda ash and co-producing high-purity gypsum with Glauber's salt and limestone by PCET reaction is as follows:

[0101] The cation exchange membrane is placed in the electrolytic cell and the electrolytic cell is divided into an anode area and a cathode area. The anode area adds 50ml sodium formate solution (concentration is 3M) as the anolyte, and the cathode area adds 50ml sodium carbonate (concentration is 2M). The cathode area was bubbled into CO at a rate of 20ml / min 2 gas, the electrolyte is continuously circulated into the electrode chamber of the electrolytic cell through a peristaltic pump at a flow rate of 20mL / min, and 0.1mol / L of As the cathode electrocatalyst Q, add 0.1mol / L of As the anode electrocatalyst QH, a DC power supply (IT6932A, Itech) was applied between the anode and cathode electrodes to provide current.

[0102] Among them, the anode electrode is carbon felt, the cathode electrode is carbon felt,...

Embodiment 3

[0111] The present embodiment utilizes PCET reaction to produce caustic soda co-production process of high-purity gypsum with Glauber's salt and limestone as follows:

[0112] The cation exchange membrane is placed in the electrolytic cell and the electrolytic cell is divided into an anode area and a cathode area. The anode area adds 50ml sodium formate solution (concentration is 3M) as the anolyte, and the cathode area adds 50ml sodium hydroxide (concentration is 1M). The peristaltic pump continuously circulates the electrolyte into the electrode chamber of the electrolytic cell at a flow rate of 20mL / min, and at the same time adds 2mol / L of As the cathode electrocatalyst Q, add 2mol / L of As the anode electrocatalyst QH, a DC power supply (IT6932A, Itech) was applied between the anode and cathode electrodes to provide current.

[0113] Among them, the anode electrode is carbon cloth, the cathode electrode is carbon cloth, and the current density is 55.6mA / cm 2 When the el...

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Abstract

The invention provides a method for producing high-purity gypsum by using Glauber's salt and limestone by PCET reaction, and belongs to the technical field of low-energy consumption two-alkali production. Put the cation exchange membrane in the electrolytic cell, add weakly acidic sodium salt solution and compound QH to the anode area as the anode electrocatalyst, add sodium carbonate or sodium hydroxide to the cathode area, and add compound Q as the cathode electrocatalyst, between the negative and positive electrodes Applying a DC power supply, during the electrolysis process, QH is oxidized to Q and releases H + , Na in the anolyte + Through the cation exchange membrane to the cathode area and the OH in the catholyte ‑ Combine to generate NaOH, or further absorb CO 2 Convert to Na 2 CO 3 ;Electrolysis contains a lot of H + The anolyte and limestone undergo a dissolution reaction, H + consumption of Ca 2+ , SO 4 2‑ with Ca 2+ Combined to generate high-purity CaSO 4 precipitation. The invention utilizes a compound with PCET reaction property as an electrocatalyst, Q is its oxidation state, QH is its reduction state, and uses mirabilite and limestone as raw materials to realize the preparation of soda ash, caustic soda and gypsum.

Description

technical field [0001] The invention belongs to the technical field of chemical production of novel low-energy two-alkali, and specifically relates to a method for producing two-alkali and co-producing high-purity gypsum with mirabilite and limestone by using PCET reaction. Background technique [0002] Two alkalis (soda ash and caustic soda) are one of the most important products in the chemical industry, and are widely used in construction, chemical industry, metallurgical industry, printing and dyeing industry, leather industry, daily chemical industry and food industry. my country is the country with the largest production capacity of soda ash and caustic soda in the world. According to statistics, in 2012, the total national consumption of salt (sodium chloride) was 86.6 million tons, while the proportion of salt used by the two alkali industries exceeded 80%, reaching 70.75 million tons. At present, my country's annual output of soda ash is close to 30 million tons, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/14C25B1/16C01F11/46C25B11/085
CPCC01F11/46C01P2006/80C25B1/14C25B1/16C25B11/04
Inventor 陆宗禄
Owner 王昱飞