Sodium Hexametaphosphate :
CAS NO.:10124-56-8
Also Named: GRA; SHMP ; CALGON; calgons ; CALGON3 ; fema3027 ; polyphos ; SHMP(food) ; SHMP(tech) ; chemi-charl ;
CB Number: CB3278208
Molecular formula: H7NaO18P6
Sodium hexametaphosphate is a kind of sodium metaphosphate polymer. Its appearance is colorless and transparent glassy solid or white powder. It has high solubility in water, but the dissolution rate is slow, and the aqueous solution is acidic. The complexes of divalent metal ions are more stable than those of monovalent metal ions, and are easy to hydrolyze to orthophosphate in warm water, acid or alkali solution. Sodium hexametaphosphate has strong hygroscopicity and begins to become sticky after hygroscopicity. For some metal ions (such as calcium, magnesium, etc.), it has the ability to form soluble complexes, so it can be used to soften water. Precipitation will also be formed with lead and silver plasma, which will be re dissolved in excess sodium hexametaphosphate solution to form a complex, and barium salt can also form a complex with sodium hexametaphosphate. It is used as high-efficiency water softener for power station, locomotive and rolling stock boiler water, Detergent additive, control or anti-corrosion agent, cement hardening accelerator, streptomycin purification agent, cleaning agent for fiber industry and bleaching and dyeing industry. It is used as a sedative in medicine, preservative, stabilizer and fruit juice precipitant in food industry. In the petroleum industry, it is used for rust prevention of drilling pipe and controlling the viscosity of mud during oil drilling. It is also used in textile printing and dyeing, tanning, papermaking, color film, soil analysis, radiochemistry and analytical chemistry. China's GB2760-1996 stipulates that sodium hexametaphosphate is a permitted food additive (water retention agent), which can be used in cans, fruit juice drinks, dairy products and bean products; It is also used as dye dispersant and water treatment agent.
Use
In the food industry, it is used as food quality improver, pH regulator, metal ion chelator, dispersant, expander, etc,
It is used as soft water agent, detergent, preservative, cement hardener, fiber and bleaching and dyeing cleaning agent. It is also used in medicine, food, petroleum, printing and dyeing, tanning, papermaking, etc.
Water softener used for boiler water and industrial water (including water for dye production, water for Titanium Dioxide production, water for printing and dyeing, water for cleaning color film copies, water for chemical industry, water for drug and reagent production, etc.), and water treatment agent for industrial circulating cooling water; It is also used as corrosion inhibitor, flotation agent, dispersant, high temperature binder, chemicalbook, dyeing assistant, metal surface treatment, rust inhibitor, detergent assistant and cement hardening accelerator. Coated paper production is used as a slurry dispersant to improve permeability. In addition, it is also used in washing utensils and chemical fibers to remove iron ions from pulp. In the petroleum industry, it is used for rust prevention and control of drilling pipe and adjusting the viscosity of mud during oil drilling.
