A method for preparing amorphous highly water-soluble ammonium polyphosphate

Through the phosphoric acid-urea reaction and the addition of magnesium salt and sulfuric acid, the problems of high production cost, insufficient water solubility and stability in the prior art were solved, and amorphous, low polymerization, and high water soluble ammonium polyphosphate products were prepared, with excellent metal ion dissolution ability and hard water resistance.

CN116262606BActive Publication Date: 2025-03-25GUIZHOU CHANHEN CHEM CO LTD
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Patent Information

Application Number
CN202310061301.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-01-16
Publication Date
2025-03-25
Estimated Expiration
2043-01-16

AI Technical Summary

Technical Problem

The prior art has problems such as high raw material requirements, high production costs, complex equipment and difficult to stabilize the control of polymerization in the production of water-soluble ammonium polyphosphate, resulting in insufficient water solubility and stability of the product.

Method used

The phosphoric acid-urea reaction is adopted, and the process conditions are controlled by the addition of magnesium salt and sulfuric acid to prepare amorphous, low polymerization, and high water-soluble ammonium polyphosphate products. This method directly uses wet phosphoric acid as a raw material, without purification and decomposition, low cost and high resource utilization.

Benefits of technology

The stability and water solubility of ammonium polyphosphate products have been improved, with a polymerization degree distributed between 2-5 and a solubility of more than 280g. It has strong dissolution ability to metal ions and has strong resistance to hard water.

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Abstract

The invention discloses a method for preparing ammonium polyphosphate, which comprises: mixing urea and phosphoric acid at an N / P molar ratio of 0.6-2.0, performing a polymerization reaction at 120-200°C for a polymerization time of 0.3-3h, cooling and crushing the product to obtain amorphous ammonium polyphosphate with a polymerization degree of less than 5, wherein the content of phosphorus pentoxide in the phosphoric acid is converted to 60% and the Mg in the phosphoric acid is reduced to 1.0%. 2+ The content is 1.0-8.0%, SO 4 2‑ The present invention utilizes the Mg contained in wet-process phosphoric acid. 2+ and SO 4 2‑ As a polymerization inhibitor and crystal inverting agent, the prepared ammonium polyphosphate product is amorphous, has a low degree of polymerization, high water solubility, good stability, strong ability to dissolve metal ions, and strong resistance to hard water.
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