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Bipolar membrane electrodialysis method for preparing hypophosphorous acid from sodium hypophosphite

A technology of bipolar membrane electrodialysis and sodium hypophosphite, applied in the direction of electrodialysis, hypophosphorous acid, phosphorus oxyacid, etc., can solve the problems of high energy consumption, complicated and cumbersome ion exchange process, low purity, etc., and achieve high yield efficient production, significant environmental and economic benefits

Inactive Publication Date: 2018-10-12
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for producing hypophosphorous acid are mainly electrodialysis and ion exchange. However, due to the strong reducing property of hypophosphorous acid, the energy consumption of traditional electrodialysis is too high and the purity is low; the process of ion exchange is complicated and cumbersome, which is not suitable for large-scale mass production

Method used

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  • Bipolar membrane electrodialysis method for preparing hypophosphorous acid from sodium hypophosphite
  • Bipolar membrane electrodialysis method for preparing hypophosphorous acid from sodium hypophosphite
  • Bipolar membrane electrodialysis method for preparing hypophosphorous acid from sodium hypophosphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Take the membrane stack composed of FBM / AHA / CMB / FBM, add 0.5L of 15wt% sodium hypophosphite feed liquid to the feed liquid tank, turn on the circulation pump and pump it into 5 groups of three-compartment chambers with a size of 9cm×21cm The feed liquid chamber of the bipolar membrane electrodialysis membrane stack, and adjust the flow rate to 20L / h; add 0.5L pure water to the alkali tank and acid tank respectively, turn on the circulation pump to pump it into the alkali chamber and acid tank of the membrane stack chamber, and adjust the flow to 20L / h; add 0.5L of 3wt% sodium sulfate solution to the anode liquid tank, turn on the circulation pump to pump it into the anode liquid chamber of the membrane stack, and run at a flow rate of 20L / h. Turn on the DC power supply and control the voltage to 10V. At this time, the reaction temperature in the compartment is 21.3°C. After 150 minutes of reaction, the acid compartment generates hypophosphorous acid with a yield of 63.34%...

Embodiment 2

[0041] Take a membrane stack composed of FBM / AHA / CMB / FBM, and adjust the voltage to 15V. At this time, the reaction temperature in the compartment is 22.6°C. Other conditions are the same as in Example 1. After 60 minutes of reaction, the acid compartment generates hypophosphorous acid with a yield of 69.58%. , the concentration chamber obtains 3.80% sodium hydroxide solution, the current efficiency is 57.09%, and the energy consumption is 5.09kWh / kg.

Embodiment 3

[0043] Take a membrane stack composed of FBM / AHA / CMB / FBM, adjust the voltage to 20V, the reaction temperature in the compartment is 23.3°C, other conditions are the same as in Example 1, react for 40 minutes, the acid compartment generates hypophosphorous acid, and the yield is 80.06% , the concentration chamber obtains 3.96% sodium hydroxide solution, the current efficiency is 58.41%, and the energy consumption is 4.99kWh / kg.

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Abstract

The present invention discloses a bipolar membrane electrodialysis method for preparing hypophosphorous acid from sodium hypophosphite. The method comprises the following steps: (1) a sodium hypophosphite aqueous solution with a mass fraction of 10 wt%-30 wt% is prepared; (2) the sodium hypophosphite aqueous solution is added into a material liquid tank; 3 wt% of a sodium sulfate solution is addedinto an electrode liquid tank; and pure water at equal volume is added into an alkali tank and an acid tank; (3) a bipolar membrane electrodialysis device is turned on; voltage is controlled at 10 V-25 V; reaction temperature in each compartment is controlled to be 20 DEG C-40 DEG C for electrodialysis; and end of reaction is reached when content of hydrogen ions titrated by a sodium hydroxide standard solution in an acid chamber is no longer increased; and (4) a hypophosphorous acid solution in the acid tank is taken to be concentrated and crystallized to obtain hypophosphorous acid crystals. The whole technology basically realizes zero discharge. The hypophosphorous acid prepared by the provided bipolar membrane electrodialysis method has high yield. The bipolar membrane electrodialysismethod has remarkable environmental benefits and economic benefits.

Description

technical field [0001] The invention relates to a method for preparing hypophosphorous acid, in particular to a bipolar membrane electrodialysis method for preparing hypophosphorous acid from sodium hypophosphite. Background technique [0002] Hypophosphorous acid (H 3 PO 2 ), a colorless oily liquid, and a deliquescent crystal in the solid state. Soluble in hot water, ethanol, ether. When heated to 130°C, it decomposes into orthophosphoric acid and phosphine, which is a strong reducing agent. It can be used in electroless plating in the production of capacitors, in the manufacture of catalysts and refrigerants for organic reactions, in food processing and preservation, and in the production of nickel / hydrogen battery cathodes, in the pharmaceutical industry, etc. It is very important in the phosphorus chemical industry product. [0003] At present, the methods for producing hypophosphorous acid are mainly electrodialysis and ion exchange. However, due to the strong red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/44B01D61/48C01B25/165
CPCB01D61/445B01D61/485C01B25/165
Inventor 沈江南裘洋波
Owner ZHEJIANG UNIV OF TECH
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