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Technique for preparing hypophosphorous acid through bipolar membrane electroosmosis method

A bipolar membrane electrodialysis and hypophosphorous acid technology, which is applied in the direction of electrodialysis, hypophosphorous acid, phosphorus oxyacid, etc., can solve the problems of industrial scale-up difficulties and achieve easy industrial scale-up, low energy consumption, and no secondary pollution Effect

Active Publication Date: 2016-06-22
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the use of two raw materials, hypophosphite and inorganic acid. In addition to the hypophosphorous acid product after electrolysis, inorganic salt by-products will also be produced. In the electrodialysis device with five chambers and seven membrane pairs, every seven membrane pairs A pair of electrodes is required, and industrial scale-up is difficult

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  • Technique for preparing hypophosphorous acid through bipolar membrane electroosmosis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Put 200 liters of sodium hypophosphite solution with a concentration of 50g / L into the salt chamber storage tank of the bipolar membrane electrodialysis device, put 200 liters of deionized water into the acid chamber and the alkali chamber storage tank respectively, and open the Circulation pump, electrolysis after electrification. Heat exchangers are used to cool the liquid in each chamber. During the electrolysis process, the temperature is controlled at 20°C. During the electrolysis process, the voltage between the anode and the cathode is controlled to be 105-110V. It can be seen that the voltage of the matching unit is (105-110V) / 60=1.75-1.83V, the current is 96-100A, it can be seen that the current density is (96-100A) / (400×800×10 -6 m 2 )=300-312.5A / m 2 . As the current of the bipolar membrane electrodialysis decreases, the sodium hypophosphite concentrate is continuously added to the salt storage tank to keep the concentration of sodium hypophosphite in the ...

Embodiment 2

[0052] Put 200 liters of sodium hypophosphite solution with a concentration of 80g / L into the salt chamber storage tank of the bipolar membrane electrodialysis device, put 200 liters of deionized water into the acid chamber and the alkali chamber storage tank respectively, and open the Circulation pump, electrolysis after electrification. A heat exchanger is used to cool the liquid in each chamber, and the temperature is controlled at 25°C during the electrolysis process. During the electrolysis process, the voltage between the anode and the cathode is controlled to be 105-110V. It can be seen that the voltage of the matching unit is 1.75-1.83V, the current is 100-110A, and the current density is 312.5-343.75A / m 2 . As the current of the bipolar membrane electrodialysis decreases, the sodium hypophosphite concentrate is continuously added to the salt storage tank to keep the concentration of sodium hypophosphite in the salt storage tank at about 80 g / L during the entire elect...

Embodiment 3

[0055] Put 200 liters of sodium hypophosphite solution with a concentration of 100g / L into the salt chamber storage tank of the bipolar membrane electrodialysis device, put 200 liters of deionized water into the acid chamber and the alkali chamber storage tank respectively, and open the Circulation pump, electrolysis after electrification. A heat exchanger is used to cool the liquid in each chamber, and the temperature is controlled at 30°C during the electrolysis process. During the electrolysis process, the voltage between the anode and the cathode is controlled to be 105-110V. It can be seen that the voltage of the matching unit is 1.75-1.83V, the current is 110-117A, and the current density is 343.75-365.625A / m 2 . As the current of the bipolar membrane electrodialysis decreases, the sodium hypophosphite concentrate is continuously added to the salt storage tank to keep the concentration of sodium hypophosphite in the salt storage tank at about 100g / L during the entire el...

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Abstract

The invention relates to a technique for preparing hypophosphorous acid through a bipolar membrane electroosmosis method. Sodium hypophosphite and deionized water are taken as raw materials; a sodium hypophosphite solution is put into a salt chamber of a bipolar membrane electroosmosis device; the deionized water is respectively put into an acid chamber and an alkali chamber; the liquid in the three chambers is pumped into the bipolar membrane electroosmosis stack for circulating; and the bipolar membrane electroosmosis device is started for performing bipolar membrane electroosmosis, so as to prepare the hypophosphorous acid and sodium hydroxide solution. The technique for preparing hypophosphorous acid, provided by the invention, is simple, low in energy consumption, mild in technical condition and free from secondary pollution, and multiple sets of grouping units can be repeatedly assembled and formed into a membrane stack between a pair of electrodes, so that the technique can be easily amplified industrially. The prepared hypophosphorous acid can be directly used as a product applied to the production raw material of sodium hypophosphite; the content of sodium ions in the hypophosphorous acid solution can be further reduced through refining; and the acquired sodium hydroxide solution can be used for adjusting the pH value in the production process of the sodium hypophosphite.

Description

technical field [0001] The invention belongs to the field of fine chemical production, and relates to a process for preparing hypophosphorous acid by bipolar membrane electrodialysis, in particular to a process for preparing hypophosphorous acid by using bipolar membrane electrodialysis using sodium hypophosphite as a raw material. Background technique [0002] Hypophosphorous acid is a fine chemical product with a wide range of uses. It is mainly used as a reducing agent in electroless plating, electroplating, and organic synthesis industries. It can also be used as a catalyst for esterification, a refrigerant, and the production of high-purity sodium hypophosphite. The preparation methods of hypophosphorous acid mainly include chemical method, ion exchange method and electrodialysis method. The chemical method generally uses yellow phosphorus to react with barium hydroxide, and then adds sulfuric acid to remove the barium after the reaction. However, the concentration of h...

Claims

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Application Information

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IPC IPC(8): B01D61/42C01B25/165
CPCB01D61/422C01B25/165
Inventor 杭晓风万印华陈向荣沈飞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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