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Method for producing food grade monoammonium phosphate by using agricultural monoammonium phosphate

A monoammonium phosphate, food-grade technology, applied in phosphate, phosphorus oxyacid and other directions, can solve the problems of high production risk, high technical requirements, high energy consumption, high production safety, simple process equipment, three wastes low emission effect

Inactive Publication Date: 2011-01-19
YICHANG RUITE FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the production process and equipment are simple, the technical requirements of the equipment are high, the production risk is high, the pollution is large, and the energy consumption is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Dissolve the agricultural ammonium phosphate with pure water, fully mix and stir and then filter, and the filtrate is set aside;

[0027] b. add 0.8% hydrogen peroxide of filtrate quality, 0.5% decolorizing agent silica or active carbon and 2% biological flocculant to the filtrate obtained in step a, fully mix and stir for 90-120 minutes, filter, and filtrate is use;

[0028] c. Heat the filtrate obtained in step b to 70-80°C and concentrate for 180-240 minutes until microcrystals appear, and the stirrer speed is 15-20 rpm;

[0029] d. Cooling and crystallization, the stirrer is 15 / min, and food-grade ammonium phosphate is obtained after drying, and the solution is recycled to step a for use.

Embodiment 2

[0031] a. Dissolve the agricultural ammonium phosphate with pure water, fully mix and stir and then filter, and the filtrate is set aside;

[0032] b. Add 1% hydrogen peroxide of filtrate quality, 0.7% decolorizing agent silica or active carbon and 2.5% biological flocculant to the filtrate obtained in step a, fully mix and stir for 90-120 minutes, filter, and filtrate is use;

[0033] c. Heat the filtrate obtained in step b to 70-80°C and concentrate for 180-240 minutes until microcrystals appear, and the stirrer speed is 15-20 rpm;

[0034] d. Cooling and crystallization, the stirrer is 15 / min, and food-grade ammonium phosphate is obtained after drying, and the solution is recycled to step a for use.

Embodiment 3

[0036] a. Dissolve the agricultural ammonium phosphate with pure water, fully mix and stir and then filter, and the filtrate is set aside;

[0037] b. Add 1.1% hydrogen peroxide, 1% decolorizing agent silica or activated carbon and 3% biological flocculant to the filtrate obtained in step a, fully mix and stir for 90-120 minutes, filter, and the filtrate is use;

[0038] c. Heat the filtrate obtained in step b to 70-80°C and concentrate for 180-240 minutes until microcrystals appear, and the stirrer speed is 15-20 rpm;

[0039] d. Cooling and crystallization, the stirrer is 15 / min, and food-grade ammonium phosphate is obtained after drying, and the solution is recycled to step a for use.

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PUM

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Abstract

The invention relates to a method for producing food grade monoammonium phosphate by using agricultural monoammonium phosphate, which comprises the following steps: a, dissolving the agricultural monoammonium phosphate in pure water, fully mixing and stirring, filtering, wherein filtrate is standby; b, adding an oxidizing agent, a decolorizing agent and a biological flocculating agent into the filtrate obtained in the a step, fully mixing and stirring, filtering to obtain filtrate for standby; c, heating the filtrate obtained in the b step to 70-80 DEG C, concentrating for 180-240min until micro crystallization occurs in; d, cooling and crystallizing, and drying to obtain the food grade monoammonium phosphate. By using a phosphating product produced by using wet-process phosphoric acid asraw materials to respectively replace phosphoric acid and ammonia in the production of the prior hot-process phosphoric acid process for producing the food grade monoammonium phosphate, the method for producing the food grade monoammonium phosphate by using the agricultural food grade monoammonium phosphate greatly lowers the cost of producing the food grade monoammonium phosphate, and has low emission of the three wastes in production, simple process equipment, high production safety, energy saving and consumption reduction.

Description

technical field [0001] The invention relates to a method for preparing food-grade monoammonium phosphate, in particular to a method for producing food-grade monoammonium phosphate by using agricultural monoammonium phosphate as a raw material. Background technique [0002] The existing method for producing food-grade monoammonium phosphate is to use thermal phosphoric acid to refine it into food-grade phosphoric acid and ammonia to react. Although the production process and equipment are simple, the technical requirements of the equipment are high, the production is dangerous, the pollution is large, and the energy consumption is high. Contents of the invention [0003] The purpose of the present invention is to provide a kind of with agricultural chemical fertilizer monoammonium phosphate as raw material, the method for producing food grade monoammonium phosphate. [0004] The object of the present invention is achieved like this: a kind of method with agricultural monoa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28
Inventor 宋火樵
Owner YICHANG RUITE FINE CHEM