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Three-membrane four-chamber chlorine-free alkali-producing electrolytic tank consisting of anion and cation exchange membranes and bipolar membrane

An anion-cation-exchange membrane and anion-exchange membrane technology, applied in the field of electrolyzers, can solve the problems of sharp drop in sales, breakage of chlor-alkali balance, etc., and achieve the effects of increasing hydrophilic properties, increasing alkali production, and improving the efficiency of electrolyzers

Inactive Publication Date: 2012-01-04
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, many organic chlorine products have been found to be carcinogenic substances, so the sales of chlorine products used as disinfectants in water plants and chlorine raw materials for household plastic products have dropped sharply, and the chlor-alkali balance in the traditional chlor-alkali production process has been broken.

Method used

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  • Three-membrane four-chamber chlorine-free alkali-producing electrolytic tank consisting of anion and cation exchange membranes and bipolar membrane
  • Three-membrane four-chamber chlorine-free alkali-producing electrolytic tank consisting of anion and cation exchange membranes and bipolar membrane
  • Three-membrane four-chamber chlorine-free alkali-producing electrolytic tank consisting of anion and cation exchange membranes and bipolar membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of cation exchange membrane:

[0027] Accurately weigh 6 g of sodium carboxymethylcellulose (CMC) to prepare 200 mL of CMC aqueous solution, and weigh 0.1 g of tetracarboxyiron phthalocyanine [FePc(COOH) 4 ], dissolved in 10mL tetrahydrofuran, slowly added to the CMC aqueous solution, stirred evenly, and degassed under reduced pressure to obtain a viscous film solution, which was cast on a flat petri dish and air-dried at room temperature to form a film, with a weight fraction of 8% (The same below) soaked in chromium chloride solution for 30min, rinsed with distilled water, and dried naturally to obtain FePc(COOH) 4 - CMC cation exchange membrane.

[0028] Preparation of anion exchange membrane:

[0029] Accurately weigh 6 g of chitosan, dissolve it with 2.0% acetic acid aqueous solution to prepare chitosan acetic acid aqueous solution with a weight fraction of 3.0%, and weigh 0.08 g of tetraaminoiron phthalocyanine [FePc(NH 2 ) 4 ], dissolved in 10 mL ...

Embodiment 2

[0038] Preparation of cation exchange membrane:

[0039] Accurately weigh 4 g of sodium carboxymethylcellulose (CMC) to prepare 280 mL of CMC aqueous solution, and weigh 0.08 g of tetracarboxy copper phthalocyanine [CuPc(COOH) 4 ], dissolved in 10mL tetrahydrofuran, slowly added to the CMC aqueous solution, stirred evenly, and degassed under reduced pressure to obtain a viscous film solution, which was cast on a flat petri dish and air-dried at room temperature to form a film, with a weight fraction of 8% (The same below) soaked in chromium chloride solution for 40min, rinsed with distilled water, and dried naturally to obtain CuPc(COOH) 4 - CMC cation exchange membrane.

[0040] Preparation of anion exchange membrane:

[0041] Accurately weigh 3 g of chitosan, dissolve it with 2.0% acetic acid aqueous solution, and prepare a chitosan acetic acid aqueous solution with a weight fraction of 3.5%, and weigh 0.07 g of tetraaminocopper phthalocyanine [CuPc(NH 2 ) 4 ], dissolved...

Embodiment 3

[0047] The structure of the electrolytic cell is as in Example 1. The cathode electrode of the electrolytic cell is a DSA electrode, and the anode electrode of the electrolytic cell is a lead electrode. The cation exchange membrane is PbPc(COOH) 4 -CM, the anion exchange membrane is Pb Pc(NH 2 ) 4 -CS.

[0048] At 40°C, adjust the cathode and anode current densities to 100mA·cm -2 , After 7 hours of electrolytic dialysis, the concentration of NaOH in the middle chamber is 36.7g / L, and the current efficiency is 65%. The cell voltage is 5.1V.

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Abstract

The invention relates to an environment-friendly, high-efficiency and energy-saving electrolytic tank, in particular to a three-membrane four-chamber chlorine-free alkali-producing electrolytic tank modified by a metal phthalocyanine derivative, with a high ionic conductivity anion exchange membrane, a high ionic conductivity cation exchange membrane and a bipolar membrane and consisting of the anion exchange membrane, the cation exchange membrane and the bipolar membrane. The three-membrane four-chamber chlorine-free alkali-producing electrolytic tank is characterized in that: the anion exchange membrane, the cation exchange membrane and the bipolar membrane are arranged between the electrolytic tank anode and the electrolytic tank cathode sequentially; an electrolytic chamber I is arranged between the electrolytic tank anode and the anion exchange membrane; an electrolytic chamber II is arranged between the anion exchange membrane and the cation exchange membrane; an electrolytic chamber III is arranged between the cation exchange membrane and the bipolar membrane; and an electrolytic chamber IV is arranged between the bipolar membrane and the electrolytic tank cathode. According to the scheme, the electrode reaction on the anode is oxygen evolution; the electrode reaction on the cathode is hydrogen evolution; the oxygen evolution and the hydrogen evolution are non-toxic and chlorine evolution reaction is avoided; the environment-friendly, high-efficiency and energy-saving electrolytic tank is environment-friendly and mild in production condition; production can be performed at the temperature of between 20 and 65 DEG C; and the current efficiency is over 70 percent.

Description

technical field [0001] The invention relates to an environmentally friendly, high-efficiency and energy-saving electrolytic cell. It specifically relates to an anion exchange membrane, a cation exchange membrane and a bipolar membrane with high ion conductivity modified by metal phthalocyanine derivatives, and a three-membrane four-chamber chlorine-free alkali-producing electrolytic cell based on the anion-cation exchange membrane and the bipolar membrane. . Background technique [0002] The chlor-alkali industry is the foundation of the traditional electrochemical industry, and its products, caustic soda, hydrochloric acid, and chlorine gas, are the basic raw materials for the chemical industry. In the traditional chlor-alkali production process, the balance of chlor-alkali is the key to the safety and efficient production of chlor-alkali plants. That is to say, the output of chlor-alkali is mutually restricted, and more alkali production means more chlorine production, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/16C25B9/08C25B13/08C25B9/19
CPCY02P20/10Y02P20/50
Inventor 陈日耀胡艳玉陈震郑曦陈晓
Owner FUJIAN NORMAL UNIV
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