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Preparation method of calcium phosphite

A technology of calcium phosphite and phosphorous acid, which is applied in the direction of phosphorous acid, phosphorus oxyacid, ammonium halide, etc., can solve the problems of not being able to meet industrial production, high requirements for reaction conditions, and low product purity, and meet the requirements of reaction conditions Low, high product purity, no effect of three wastes

Inactive Publication Date: 2014-04-16
杨洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the process of domestic production of calcium phosphite is relatively complicated, the reaction conditions are relatively high, and the product purity is low, which cannot meet the needs of industrial production.

Method used

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  • Preparation method of calcium phosphite

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Embodiment 1

[0017] The preparation method of calcium phosphite, the reaction steps are: first, the mass concentration of 50% phosphorous acid and the mass concentration of 50% calcium chloride are added into the reactor in a molar ratio of 1:1 for reaction, and the reaction temperature Control it within the range of 50-80°C. After the phosphorous acid and calcium chloride have reacted by 30%, start to drop ammonia water with a mass concentration of 20% into the reactor according to the molar ratio of phosphorous acid to 2:1. The ammonia water is added dropwise completely, and the reaction ends; then, the solid-liquid separation is carried out on the reactant, and the separated solid phosphorous acid is washed with water and dried to obtain the finished product. The separated liquid is ammonium chloride aqueous solution, which can be used to prepare fertilizers, and no three wastes are generated during the whole reaction process, and the reaction process is safe and environment-friendly.

Embodiment 2

[0019] The preparation method of calcium phosphite, the reaction steps are: firstly add phosphorous acid with a mass concentration of 40% and calcium chloride with a mass concentration of 50% in a molar ratio of 1:1 into the reactor for reaction, the reaction temperature Control it within the range of 50-80°C. After the phosphorous acid and calcium chloride have reacted by 20%, start adding ammonia water with a mass concentration of 30% into the reactor at a molar ratio of 2.1:1 to the phosphorous acid. The ammonia water is added dropwise completely, and the reaction ends; then, the solid-liquid separation is carried out on the reactant, and the separated solid phosphorous acid is washed with water and dried to obtain the finished product. The separated liquid is ammonium chloride aqueous solution, which can be used to prepare fertilizers, and no three wastes are generated during the whole reaction process, and the reaction process is safe and environment-friendly.

Embodiment 3

[0021] The preparation method of calcium phosphite, the reaction steps are as follows: first, the mass concentration of 40% phosphorous acid and the mass concentration of 40% calcium chloride are added into the reactor in a molar ratio of 1:1 for reaction, and the reaction temperature Control it within the range of 50-80°C. After the phosphorous acid and calcium chloride have reacted by 40%, start adding ammonia water with a mass concentration of 10% into the reactor at a molar ratio of 2:1 to the phosphorous acid. The ammonia water is added dropwise completely, and the reaction ends; then, the solid-liquid separation is carried out on the reactant, and the separated solid phosphorous acid is washed with water and dried to obtain the finished product. The separated liquid is ammonium chloride aqueous solution, which can be used to prepare fertilizers, and no three wastes are generated during the whole reaction process, and the reaction process is safe and environment-friendly. ...

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Abstract

The invention discloses a preparation method of calcium phosphite. The preparation method is characterized in that the calcium phosphite is prepared from phosphorous acid, calcium chloride and ammonium hydroxide through reaction, wherein a reaction equation is H3PO3+CaCl2+2NH3.H2O=CaHPO3.H2O+2NH4Cl+H2O, wherein the mol ratio of the phosphorous acid to the calcium chloride to the ammonium hydroxide is 1:1:(2.0-2.1), the mass concentration of the phosphorous acid is 40-60 percent, the mass concentration of the calcium chloride is 40-50 percent and the mass concentration of the ammonium hydroxide is 10-30 percent. The preparation method disclosed by the invention is simple, easy to operate, lower in requirements of reaction conditions, high in purity of the calcium hypophosphite, suitable for industrialized production, and free from generating three wastes.

Description

technical field [0001] The invention relates to a preparation method of calcium phosphite, which belongs to the technical field of chemical production. Background technique [0002] Calcium phosphite, as a non-toxic dual-function anti-rust pigment, is widely used in the paint industry. At present, the process of domestic production of calcium phosphite is relatively complicated, the requirements for reaction conditions are relatively high, and the product purity is low, which cannot meet the needs of industrial production. Therefore, a new technical solution is needed to solve the above technical problems. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of calcium phosphite, which is simple, easy to operate, has low requirements on reaction conditions, high product purity, is suitable for industrial production, and produces no three wastes. [0004] The technical scheme adopted in the present invention is: [00...

Claims

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Application Information

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IPC IPC(8): C01B25/163C01C1/16
Inventor 杨洋赵津华
Owner 杨洋
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