Synthesizing method of sodium tripolyphosphate

• Main Authors: ZHOU JINQUAN, WANG MINGXIAN, WEI XINHONG, LV HEPING, ZHANG WANLIN, WANG WEIMIN
• Format: Patent
• Language: Chinese; English
• Published: 11.09.2013
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOUNDS THEREOF; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention relates to a method for obtaining sodium tripolyphosphate by the one-step polycondensation of phosphoric acid and caustic soda. The method comprises the following steps: putting the phosphoric acid and the caustic soda into a reaction kettle; controlling a reaction process by regulating the neutralization degree and the baume degree when reaction raw materials reach two thirds of the capacity of the reaction kettle; pumping a neutralization reaction liquid into a neutralization liquid storing tank by using a pump after the neutralization reaction; spraying into an air-blowing drier by using a high-pressure pump and performing polymerization dehydration; cooling and packaging, thereby obtaining a sodium tripolyphosphate product. The method has the advantages of being energy-saving, simple in process and free of carbon emission. As a result, the method is suitable for large-scale production.