Method for preparing food-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 oxyacids, applications, etc., can solve the problem of production of food-grade monoammonium phosphate without wet-process phosphoric acid, low production continuity, and unstable product quality To achieve good economic and social benefits, reduce three wastes and energy consumption, and achieve high product quality

Active Publication Date: 2010-10-13
GUANGXI MINGLI CHEM
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Problems solved by technology

Although the process equipment of this method is simple and the production safety is high, because the intermediate phosphorus chemical products from wet-process phosphoric acid to monoammonium phosphate are used as raw materials, the production continuity is not high and the product quality is unstable.
[0005] As far as the existing technology is concerned, there is no method for directly producing food-grade monoammonium phosphate with wet-process phosphoric acid

Method used

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

Examples

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Embodiment 1

[0033] Add weight concentration 40% P in the raw material pretreatment kettle 2 o 5 Wet-process phosphoric acid, according to the amount of arsenic in it, add 1.1 times the amount of arsenic 2 S 5 , stirred at 60°C for 50 minutes to obtain a sediment-containing slurry; the above-mentioned slurry was filtered for the first time with a plate and frame filter press while it was hot, the filtrate was used for neutralization, and the filter cake was sent to the solid waste disposal center; Put the recovered crystallization mother liquor with 18% of the volume of the reaction kettle into the enamel reaction kettle, start the agitator, slowly add the impurity-removed phosphoric acid, and slowly pass in ammonia gas, control the pH=4.4 and carry out the neutralization reaction at a temperature of 55°C, and the volatilized ammonia After being absorbed by the pickling bubbling absorption tower, the gas is refluxed into the reaction kettle, and the pH=4.4 is controlled as the end point ...

Embodiment 2

[0035] Put into the weight concentration 38% P in the raw material pretreatment kettle 2 o 5 Wet-process phosphoric acid, add 1.3 times the amount of arsenic according to the arsenic content of P 2 S 5 , stirred at 50°C for 60 minutes to obtain a sediment-containing slurry; use a plate and frame filter press to filter the above slurry for the first time while it is hot, the filtrate is used for neutralization, and the filter cake is sent to the solid waste disposal center; Put the recovered crystallization mother liquor with 15% of the volume of the reaction kettle into the stainless steel reaction kettle, start the agitator, slowly add the impurity-removed phosphoric acid, and slowly pass in ammonia gas, control the pH=4.6 and carry out the neutralization reaction at a temperature of 70°C, and the volatilized ammonia After the gas is absorbed by the pickling packing absorption tower, it is refluxed into the reaction kettle, and the pH=4.6 is controlled as the end point of t...

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Abstract

The invention discloses a method for producing food-grade monoammonium phosphate from wet-process phosphoric acid. The low-cost wet-process phosphoric acid is adopted as a raw material, is subjected to impurity removal and undergoes neutralization reaction with ammonia to prepare the food-grade monoammonium phosphate; a pickling procedure is adopted, so that volatile gas materials are recycled, crystallization mother liquor is recycled or concentrated for recycling, the food-grade monoammonium phosphate product is obtained, and the product yield is improved; meanwhile, byproducts in the production process are used as compound fertilizer materials. The method greatly reduces the production cost of the food-grade monoammonium phosphate, ensures the stability of product quality, avoids secondary pollution, and has low energy consumption and good economic and social benefits.

Description

Technical field: [0001] The invention belongs to the technical field of food additive preparation, and relates to a method for producing food-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 used as a leavening agent, dough conditioner, yeast food, brewing and fermentation aids, buffers and animal feed additives. [0003] In the prior art, the preparation of monoammonium phosphate mostly belongs to industrial grade. For example, Chinese patent 200810196872.4 proposes a process for continuously producing industrial grade monoammonium phosphate with wet-process phosphoric acid. After desulfurization, the wet-process phosphoric acid is neutralized with ammonia and settled After the impurities are separated, adjust the pH, filter twice, and dry the filtrate through evaporation and crystalliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C05G1/00
Inventor 林军吴小海马钊松苏杰文
Owner GUANGXI MINGLI CHEM
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