Coproduction method of potassium dihydrogen phosphate, sulfur base composite fertilizer and aluminium polychloride

Abstract

A joint preparation method of potassium dihydrogen phosphate, sulfur-based compound fertilizer and polymerize aluminum chloride(PAC), its characteristics include follow steps: dissolution and conversion of ammonium dihydrogen phosphate, filtering and cooling crystallization, double decomposition and neutralization cooling crystallization, prepared sulfur-based compound fertilizer, aluminum powder acid solution, preparation of PAC, and so on. Using this invention, not only can solve the impurities interference problem which caused by using orthophosphoric acid (phosphate) to produce potassium dihydrogen phosphate by wet method, can improve the recovery rate of potassium dihydrogen phosphatea almost to 100%, but also can obtain by-product of no chlorine sulfur-based compound fertilizer and PAC; the invention can make almost all the phosphorus pentoxide be water-soluble finished product, not after granulation and drying, directly through crystallization to obtain whole soluble compound fertilizer. Mother liquor circulation reaction make the eliminating of chlorine problem be simple; therefore, the product is high yield, low energy consumption, good quality.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows for better control over crystal growth during chemical reactions involving certain substances such as nitrogen gas. By controlling how well it mixes liquid solutions together, this results in less unwanted side products being formed compared to traditional methods like dry processes. Additionally, the resulting purified solution contains fewer filers than previous techniques while still maintaining good properties. Overall, this new technique improves overall performance and economics of producing various types of useful components from chemically synthesizable starting materials.

Problems solved by technology

This patents describes different ways to make high purity (P) hydroxypropylidenediaminetetraacetic acid (HDPAA). Different techniques aim to reduce unwanted substances like FeOxand Colloids during the production steps involved with making certain chemicals called HPDAs. Additionally, some existing methods involve complex operations involving multiple reagents and solvent extraction procedures, leading to lower yields and higher costs associated with obtaining desired materials from them.

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