Method for producing sodium tripolyphosphate without chloride or fluoride

A technology of sodium tripolyphosphate and fluoride, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of excessive production cost and energy consumption, and limit large-scale application, and achieve low cost and high yield big effect
CN107792841AActive Publication Date: 2018-03-13HUBEI XINGFA CHEM GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUBEI XINGFA CHEM GRP CO LTD
Publication Date
2018-03-13

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Abstract

The invention discloses a method for producing sodium tripolyphosphate without chloride or fluoride. The method comprises the following steps: firstly, neutralization reaction: adding water into a neutralization pot for heating, and adding sodium carbonate for stirring until the sodium carbonate is completely dissolved; when the temperature of a solution is raised to 90 to 120 DEG C, slowly addingphosphoric acid while stirring and adjusting the K value of neutralizing slurry to 2.8+ / -0.2; then adding silicon dioxide, continuously reacting for 3.5+ / -0.5 hours until a mixed solution is viscous,and filtering to obtain a viscous slurry for later use; secondly, drying and dehydrating: feeding the viscous slurry obtained by neutralization into a drying tower for atomization and dehydration; thirdly, polymerization and generation: carrying out polymerization reaction on dried and dehydrated raw materials to obtain the sodium tripolyphosphate; fourthly, carrying out alkali wash on tail gas contained hydrogen chloride, hydrogen fluoride and silicon tetrafluoride and emptying after the substances are determined to be qualified by detecting. The production method of the sodium tripolyphosphate, provided by the invention, has the advantages that the cost of the raw materials is low, the process is simple, the industrialization is easy to realize and the raw materials are easy to obtain;the obtained sodium tripolyphosphate does not contain the chloride or the fluoride.
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Description

technical field

[0001] The invention relates to a preparation method of sodium tripolyphosphate, in particular to a method for producing sodium tripolyphosphate free of chloride and fluoride. Background technique

[0002] Sodium tripolyphosphate is used as a softener, dispersant, and dyeing aid. Used as a softener for industrial water, reducing the content of calcium, magnesium, iron and other metal ions in industrial water, and reducing the hardness of water; used as a dispersant in industrial configurations such as paint, kaolin, magnesium oxide, calcium carbonate, etc., used for drilling mud dispersion agent. In addition, it can also be used as a water reducer for molds such as detergent additives, food additives, and gypsum. When used as a water softener to soften industrial water, excessive chloride and fluoride residues will limit the further application of industrial water. When used as a dispersant in industrial configurations such as paint, kaolin, magnesium oxide...

Claims

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