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Preparation technology of hypophosphorous acid with five-room electrodialysis method

An electrodialysis method, electrodialysis technology, applied in the field of hypophosphorous acid preparation by five-chamber electrodialysis method, can solve the problems of low efficiency and high energy consumption, and achieve the effects of high efficiency, low energy consumption and simple operation

Inactive Publication Date: 2013-09-25
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, membrane electrolysis has its own disadvantages, such as high energy consumption and low efficiency.

Method used

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  • Preparation technology of hypophosphorous acid with five-room electrodialysis method
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  • Preparation technology of hypophosphorous acid with five-room electrodialysis method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]The electrode plate material is made of high-quality titanium as the base material, and the surface is coated with rare metal ruthenium, and the electrode area is 20000cm 2 . The solution volume of each chamber of the five-chamber electrodialysis device is 2000 mL. The initial solution concentration of the electrode chamber is 10g / L sulfuric acid aqueous solution. The mass ratio to sodium hypophosphite monohydrate crystals is 0.5:1.

[0036] Using the above electrodialysis device, its working voltage is DC 9V, the liquid flow rate of each chamber is 300L / h, the total flow rate is 1500L / h, and the electrodialysis time is 3h. After the start of operation, samples were taken at intervals to measure the pH changes in the samples in each chamber. The standard for the completion of electrodialysis was that the current flowing through the electrodialyzer began to drop significantly. The test results are shown in Table 1.

[0037] Table 1 Product chamber pH and current as a ...

Embodiment 2

[0041] The electrode material is made of high-quality titanium as the base material, and the surface is coated with rare metal ruthenium, and the electrode area is 20000cm 2 . The solution volume in each chamber of the five-chamber electrodialyzer was 2000 mL. The initial solution concentration of the electrode chamber is 10g / L of dilute sulfuric acid solution. The mass ratio with sodium hypophosphite crystal is 0.6:1.

[0042] The above electrodialysis device was used, its working voltage was DC 9V, the liquid flow rate of each chamber was 300L / h, and the electrodialysis time was 2h. After the start of operation, samples were taken at intervals to measure the pH changes in the samples in each chamber. The standard for the completion of electrodialysis was that the current flowing through the electrodialyzer began to drop significantly.

Embodiment 3

[0044] The electrode material is made of high-quality titanium as the base material, and the surface is coated with rare metal ruthenium, and the electrode area is 20000cm 2 . The solution volume in each chamber of the five-chamber electrodialyzer was 2000 mL. The initial solution concentration of the electrode chamber is 10g / L sulfuric acid, the sodium sulfate chamber and the hypophosphorous acid chamber are both double distilled water, the sodium hypophosphite chamber is 51.9g / L sodium hypophosphite solution, the sulfuric acid chamber is 25g / L sulfuric acid, sulfuric acid and monohydrate The mass ratio of sodium hypophosphite crystals is 0.4:1.

[0045] The above electrodialysis device was used, its working voltage was DC 9V, the liquid flow rate of each chamber was 300L / h, and the electrodialysis time was 2h. After the start of operation, samples were taken at intervals to measure the pH changes in the samples in each chamber. The standard for the completion of electrodia...

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Abstract

The present invention provides a preparation technology of hypophosphorous acid with five-room electrodialysis method, which takes hypophosphite and mineral acid as raw materials, and titanium plate ruthenium plating as the electrode. The electric field effect of the five-room electrodialysis tank is used for ion exchange; 40-200g / L hypophosphite aqueous solution and 20-100g / L sulfuric acid aqueous solution are provided in two raw material rooms of the five-room electrodialysis tank; the mass ratio between the input raw material of sulfuric acid and hypophosphite crystal is (0.4-0.6): 1; sulfuric acid aqueous solution with the initial concentration of 5-10g / L is provided in an electrode chamber of the five-room electrodialysis tank; distilled water or purified water or deionized water is provided in two product chambers of the five-room electrodialysis tank. The preparation process provided by the present invention improves membrane electrolysis method and traditional electrodialysis method of preparation of hypophosphorous acid, which has simple technological process, low energy consumption, and low production cost with little environment pollution and high conversion efficiency, and is easy for industrial mass production. The electrodialysis device adopted by the invention can be easily operately with low energy consumption and low cost.

Description

technical field [0001] The invention belongs to the field of fine chemical production, in particular to a process for preparing hypophosphorous acid by a five-chamber electrodialysis method. Background technique [0002] Hypophosphorous acid is a widely used chemical raw material. It is mainly used as a reducing agent for electroless plating to prevent the discoloration of phosphoric acid resins. It is also used as a catalyst and refrigerant for esterification reactions, and in the production of high-purity sodium hypophosphite. In the production of capacitors, the quality of chemical reagents is extremely high, and the main impurity ions affecting the quality of hypophosphorous acid are SO 4 2+ , Cl — and heavy metal ions. [0003] In the traditional production of hypophosphorous acid, yellow phosphorus and barium hydroxide are generally used as raw materials, and sulfuric acid is added to remove barium. However, the solubility of barium salt is small, the concentration...

Claims

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Application Information

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IPC IPC(8): C01B25/165
Inventor 陈金芳郭振林陈启明刘仿军杨泽青
Owner WUHAN INSTITUTE OF TECHNOLOGY
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