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Treatment method of sodium hypophosphite production residues

A sodium hypophosphite and treatment method technology, which is applied in the direction of hypophosphorous acid, phosphorous acid, phosphorus oxyacid, etc., can solve the problems of environmental pollution, high treatment cost, and low product purity, and achieve high purity, simple process, and product yield. The effect of rate stabilization

Pending Publication Date: 2019-11-15
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the present invention aims to propose a treatment method for the production residue of sodium hypophosphite to solve the problems of high processing cost of the production residue of sodium hypophosphite, low purity of the processed product, and easy pollution to the environment during the treatment process

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  • Treatment method of sodium hypophosphite production residues
  • Treatment method of sodium hypophosphite production residues
  • Treatment method of sodium hypophosphite production residues

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Embodiment 1

[0031] Combine figure 1 As shown, the method for processing sodium hypophosphite production residues of this embodiment specifically includes the following steps:

[0032] 1) 100g of sodium hypophosphite production residue, 55g of sodium carbonate, and 800ml of water were sequentially added to a reactor equipped with circulating condensed water and mixed, heated to 100°C, stirred and reacted for 8 hours, and then filtered while hot to obtain filter residue A and The filtrate B, wherein the filter residue A contains high-purity calcium carbonate, and the filtrate B contains sodium phosphite, sodium hypophosphite, and sodium carbonate solution, and in this embodiment, the sodium hypophosphite production residue is mainly contained in the sodium hypophosphite production process. The chemical composition of calcium phosphate, calcium hydroxide, calcium carbonate and industrial residues attached to sodium hypophosphite products is shown in Table 1;

[0033] 2) Adjust the pH of the filt...

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Abstract

The invention provides a treatment method of sodium hypophosphite production residues. The method comprises the following steps: 1) mixing the sodium hypophosphite production residues, sodium carbonate and water, performing heating, performing stirring, and performing filtering while the formed solution is hot to obtain filter residues A and a filtrate B; 2) adjusting the pH value of the filtrateB to 7-8 by using an acid, performing evaporative crystallization, performing washing and performing filtering to obtain filter residues C and a filtrate D; 3) drying the filter residues C to obtain sodium phosphite; 4) performing evaporative crystallization on the filtrate D, performing washing, performing filtering and performing drying to obtain sodium hypophosphite; and 5) calcining the filterresidues A, performing digestion, performing carbonization, performing surface treatment, performing filtering and performing drying to obtain nano activated calcium carbonate. According to the method provided by the invention, the industrial residues obtained by production of sodium hypophosphite fully react with a sodium carbonate solution, three products including the sodium hypophosphite, thesodium phosphite and the nano activated calcium carbonate are obtained through simple treatment, no by-product is generated in the whole technological process, the technology is simple, economical and environmentally friendly, the product has a stable yield and high purity, and the method is suitable for industrial large-scale production.

Description

Technical field [0001] The invention relates to the technical field of phosphorous chemical production, in particular to a method for processing sodium hypophosphite production residue. Background technique [0002] Sodium hypophosphite (NaH 2 PO 2 ), also known as sodium hypophosphite, colorless monoclinic crystals or pearly crystals or white crystalline powder. It is deliquescent, soluble in water, glycerin, alcohol and acetic acid, insoluble in ether, and has strong reduction It is widely used in electronics, automobiles, machinery, petroleum, chemical, aerospace, food, medicine and other industries. [0003] Sodium phosphite (Na 2 HPO 3 ), white crystalline powder, easily soluble in water. The reducibility of sodium phosphite is weaker than that of sodium hypophosphite. It can replace hypophosphite as a reducing agent to a certain extent, and the effect is more stable and safer. [0004] Nano calcium carbonate, also known as ultrafine calcium carbonate, refers to ultrafine powd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/163C01B25/165C01F11/18B82Y40/00
CPCC01B25/163C01B25/165C01F11/183C01F11/182B82Y40/00C01P2006/80C01P2006/60C01P2006/19
Inventor 刘生鹏顾继山谢志翰徐先海许莉莉樊庆春孙国锋熊芸吴晓宇丁一刚
Owner WUHAN INSTITUTE OF TECHNOLOGY
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