Method for producing sodium tetrapolyphosphate
A technology of sodium tetrapolyphosphate and fusion polymerization, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of sodium tetrapolyphosphate, and achieve the effect of easy operation and simple equipment
Inactive Publication Date: 2009-06-24
HUBEI XINGFA CHEM GRP CO LTD
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[0003] Sodium tetrapolyphosphate has a wide range of applications and a large market demand. At present, there are almost no research reports on the production process of sodium tetrapolyphosphate at home and abroad.
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[0010] A method for producing sodium tetrapolyphosphate, comprising the steps of:
[0011] a. Neutralization reaction: first add water to the neutralization pot, add a certain amount of soda ash, start stirring, and heat it with steam to dissolve it completely. When the temperature of the solution rises to ≥85°C, slowly add phosphoric acid to react and adjust the neutralization The K value of the neutralization degree of the solution is 1.75±0.2, continue to react until the solution becomes viscous;
[0012] b. Polymerization generation: Send the viscous slurry obtained in step a into a fusion furnace for dehydration. The temperature of the melt polymerization is controlled at 620°C-680°C. Sodium polyphosphate, formed by quenching into glassy sodium tetrapolyphosphate.
[0013] The amount of water used to dissolve soda ash is calculated based on the solubility of soda ash at the reaction temperature.
[0014] In the above step a reaction, the amount of soda ash is first fixe...
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The invention provides a method for preparing tetra-polyphosphate sodium. The method comprises that: water is added in a neutralization boiler, added with certain amount of soda ash, stirred, filled with vapor and heated so as to completely dissolve the soda ash; when the solution temperature rises to more than or equal to 85 DEG C, the solution is slowly added with phosphoric acid for reaction, and the neutralization degree K value of the neutralization solution is adjusted to between 1.73 and 1.77; the neutralization solution is continuously reacted until the solution becomes sticky, the obtained sticky slime is transferred to a melt polymerization furnace for dewatering, and the temperature of the melt polymerization is controlled to be between 620 and 680 DEG C, and the melt polymerization time is at least kept for 30 minutes; and the melted tetra-polyphosphate sodium is generated through the melt polymerization, and subjected to quenching to obtain glassy tetra-polyphosphate sodium. The method has the advantages of simple process and equipment, easy operation and easy realization of industrialized production and the P2O5 content in the tetra-polyphosphate sodium prepared by the method reaches 60.5 to 61.5 percent.
Description
technical field [0001] The invention relates to a method for producing sodium tetrapolyphosphate. Background technique [0002] my country's sodium tripolyphosphate began to be produced after 1965, and then sodium hexametaphosphate was also put into production, but the production of sodium tetrapolyphosphate is still blank in China. The properties of sodium tetrapolyphosphate show that its multiple uses cannot be replaced by sodium tripolyphosphate and sodium hexametaphosphate. When sodium tetrapolyphosphate is used together with dyes, it can greatly increase the dispersion speed of dyes; Ions have a strong complexing ability, especially the complexing ability to calcium ions is unmatched by other phosphates. It can be applied to the printing and dyeing industry to passivate metal ions, eliminate the interference to printing and dyeing, and make printing and dyeing fabrics The color is vibrant and firm. Sodium tetrapolyphosphate is also used in the food industry, photograp...
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IPC IPC(8): C01B25/41
Inventor 田亚妮徐珍袁兵张淼
Owner HUBEI XINGFA CHEM GRP CO LTD