Method for preparing industrial grade monoammonium phosphate from wet-process phosphoric acid

A technology of monoammonium phosphate and wet-process phosphoric acid, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of complicated operation and long process flow, and achieve the effects of avoiding secondary pollution, reducing raw material consumption, and reducing production costs

Inactive Publication Date: 2010-10-13
广西利达磷化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can obtain high-quality products, the process

Method used

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  • Method for preparing industrial grade monoammonium phosphate from wet-process phosphoric acid
  • Method for preparing industrial grade monoammonium phosphate from wet-process phosphoric acid

Examples

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Embodiment 1

[0028] In the enamel reaction kettle, drop into the reclaimed crystallization mother liquor of 20% of the reaction kettle volume, start the agitator, then slowly add 40% P by weight concentration to the mother liquor 2 o 5 Wet-process phosphoric acid, and slowly feed ammonia gas, control PH=4.4 to carry out neutralization reaction at a temperature of 55°C, the volatilized ammonia gas is absorbed by the pickling bubbling absorption tower and then refluxed into the reactor, control PH=4.4 to At the end of the neutralization reaction, after stopping feeding, continue to stir for 20 minutes to obtain an industrial-grade monoammonium phosphate slurry; filter the obtained industrial-grade monoammonium phosphate slurry with a plate and frame filter press while it is hot to remove impurities, and send the filter cake to Compound fertilizer processing plant; send the obtained industrial-grade monoammonium phosphate solution to a vacuum concentrator for heating and concentration until a...

Embodiment 2

[0030] In the stainless steel reaction kettle, drop into the reclaimed crystallization mother liquor of 15% of the reaction kettle volume, start the agitator, then slowly add the weight concentration 38% P in the mother liquor 2 o 5 Wet-process phosphoric acid, and slowly feed ammonia gas, control pH = 4.6 to carry out neutralization reaction at a temperature of 70 ° C, the volatilized ammonia gas is absorbed by the pickling packed absorption tower and then refluxed into the reactor, control pH = 4.6 to neutralize and reaction end point, after stopping feeding, continue stirring for 30 minutes to obtain industrial-grade monoammonium phosphate slurry; filter the obtained industrial-grade monoammonium phosphate slurry with a plate and frame filter press while it is hot, remove impurities, and send the filter cake to compound Fertilizer processing plant; send the obtained industrial-grade monoammonium phosphate solution to a vacuum concentrator for heating and concentration until...

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Abstract

The invention discloses a method for preparing industrial grade monoammonium phosphate from wet-process phosphoric acid. In the method, the industrial grade monoammonium phosphate is prepared by neutralizing ammonia with low-cost wet-process phosphoric acid serving as raw materials; a pickling procedure is adopted, so that volatile gas materials are recycled, crystallization mother liquor is recycled or concentrated for recycling, the industrial grade monoammonium phosphate product is obtained, and the product yield is improved; meanwhile the by-products in the production process are used as compound fertilizer materials. The method has the advantages of greatly reducing the production cost of the industrial grade monoammonium phosphate, guaranteeing the stability of the product quality, and avoiding secondary pollution, along with low energy consumption and better economic benefit and social benefit.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of phosphorus chemical products, and relates to a method for producing industrial-grade monoammonium phosphate with wet-process phosphoric acid. Background technique: [0002] Monoammonium phosphate is also known as ammonium dihydrogen phosphate, and its molecular formula is NH 4 h 2 PO 4 . Monoammonium phosphate is mainly used as a fire retardant for wood, paper, and fabrics. [0003] In the prior art, the production of industrial-grade monoammonium phosphate mostly adopts the traditional method, that is, the direct neutralization reaction of thermal phosphoric acid and ammonia is used to produce it. Although the production process and equipment are simple and the product quality is high, the technical requirements of the equipment are high, the cost is high, and the energy consumption is high. At present, the technology of producing monoammonium phosphate by wet-process phosphoric acid...

Claims

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Application Information

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IPC IPC(8): C01B25/28
Inventor 林军吴小海马钊松苏杰文
Owner 广西利达磷化工有限公司
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