A kind of production method of inorganic ammonium salt, this inorganic ammonium salt and application

Abstract

The invention relates to a production method of inorganic ammonia salt, the inorganic ammonia salt and application, which belong to the field of a fine phosphorus chemical industry. The production method comprises the step of mixing a condensing agent, a nitrogen-containing substance and phosphoric acid into a polymerization reactor for carrying out polymerization reaction, wherein the condensing agent is phosphoric anhydride or urea; the phosphoric acid concentration is 75 percent to 125 percent; the mass ratio of the condensing agent to nitrogen-containing substance to the phosphoric acid is 1.0:(0.5 to 2.0):(2.0 to 7.0). An ammonia salt product produced by the invention is a solid body so as to have significant advantages on production process control and storage transportation compared with a liquid product.

Description

technical field [0001] The invention relates to a production method of ammonium salt, in particular to a production method of inorganic ammonium salt, and also relates to the inorganic ammonium salt and its application, belonging to the field of fine phosphorus chemical industry. Background technique [0002] The appearance of water-soluble ammonium polyphosphate (WSAPP) is white powder. It is a polyphosphate containing nitrogen and phosphorus. When the degree of polymerization n is less than 20, it is water-soluble. It is called short-chain APP or WSAPP. When n is greater than 20 , is poorly soluble, and is called long-chain APP. [0003] Ammonium polyphosphate (WSAPP) with a degree of polymerization of 2-20 has high nitrogen and phosphorus nutrient content, full water solubility, convenient application, neutral pH value, safe use, strong chelating ability, easy absorption and utilization, gradually hydrolyzed in soil, The advantages of slow-release and long-acting are in l...

AI Technical Summary

Problems solved by technology

Japanese open patent No. 49-30356 has reported the method that adopts ammonium orthophosphate (as ammonium dihydrogen phosphate) and urea mixed heating dehydration to produce water-soluble ammonium polyphosphate product, because its reaction process is slow, production control difficulty, productive rate Low energy consumption, high energy consumption, thus affecting the implementation and promotion of its industrialization

[0013] In general, the above-mentioned technologies more or less have the following deficiencies: complex process flow, slow reaction process, serious corrosion of equipment, easy blockage of pipelines, difficult production control, high reaction temperature, high energy consumption and many impurities, average polymerization of products Small degree, low polymerization rate, large dispersion, low total nutrient, easy to absorb moisture, low solubility, too much insoluble matter, unstable quality, heavy waste gas treatment load, poor production environment, and high pressure on environmental protection

Due to the inconsistent understanding of the production technology of water-soluble ammonium polyphosphate, the domestic enterprises have great differences in product quality and small output, which cannot meet the market demand and need to import it every year.

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