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Production method of industrial monoammonium phosphate

A production method, monoammonium phosphate technology, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of long production cycle and low overall benefit

Active Publication Date: 2020-03-31
WENGFU DAZHOU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses natural sedimentation to separate the clear liquid and slurry after the neutralization of wet-process phosphoric acid and ammonia, the production cycle is long, and the overall benefit is not high

Method used

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  • Production method of industrial monoammonium phosphate
  • Production method of industrial monoammonium phosphate
  • Production method of industrial monoammonium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 Shown, a kind of production device of industrial grade monoammonium phosphate, comprises the reactor A and reactor B that middle part communicates; Said reactor A is provided with liquid ammonia delivery pipeline and wet-process phosphoric acid delivery pipeline; Said reactor B The lower part is connected to the solid-liquid separation device, and the solid-liquid separation device is connected to the mother liquid collection tank for collecting the crystallization mother liquid II, and the mother liquid collection tank is connected to the crystallization mother liquid II delivery pipe, and the outlet of the crystallization mother liquid II delivery pipe is set at the reaction kettle A above, used to transport the crystallization mother liquor II to the reactor A; the upper part of the reactor B is provided with a crystallization mother liquor I conveying pipe, and the outlet of the crystallization mother liquor I conveying pipe is arranged on the reacto...

Embodiment 2

[0047] The only difference with Example 1 is:

[0048] In the step (1) and step (3), the stirring speed is 31r / min, and the temperature is 100°C;

[0049]In the step (2), the neutralization solution is stirred and settled at a stirring speed of 25 r / min; the temperature of the reaction process is 90°C.

Embodiment 3

[0051] The only difference with Example 1 is:

[0052] In the step (1) and step (3), the stirring speed is 33r / min, and the temperature is 105°C;

[0053] In the step (2), the neutralization liquid is stirred and settled, and the stirring speed is 27r / min; the temperature of the reaction process is 95°C;

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PUM

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Abstract

The invention discloses a production method of industrial monoammonium phosphate. The production method comprises the following steps: (1) neutralization: mixing and stirring a monoammonium phosphatemother solution, liquid ammonia and wet-process phosphoric acid for a reaction to obtain a neutralized solution, (2) layering: stirring and settling the neutralized solution, layering the solution toobtain an upper-layer material crystallization mother solution I and a lower-layer material, and carrying out solid-liquid separation on the lower-layer material to obtain a monoammonium phosphate crystal finished product and a crystallization mother solution II, (3) crystallization mother liquor returning: mixing and stirring the crystallization mother liquor I, the crystallization mother liquorII, wet-process phosphoric acid and liquid ammonia for a reaction to obtain a neutralized solution, and (4) process in the step (2) on the neutralized solution obtained in the step (3). According to the production method, continuous crystallization is realized, so that a large-granularity monoammonium phosphate crystal finished product can be obtained.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method of industrial-grade monoammonium phosphate. 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 for the equipment and process are high, and the production cost of yellow phosphorus is high, resulting in high production cost of thermal acid. In order to reduce the production cost of industrial-grade monoammonium phosphate, at pr...

Claims

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Application Information

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IPC IPC(8): C01B25/28
CPCC01B25/28
Inventor 付勇冉瑞泉拾佳刘辉张俊赵强
Owner WENGFU DAZHOU CHEM CO LTD
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