Production method for monoammonium phosphate

A monoammonium phosphate and production method technology, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of high product cost, unstable product quality, long process flow, etc., to simplify the production process and benefit the value of environmental protection , the effect of reducing environmental pollution

Inactive Publication Date: 2014-09-03
GUIYANG KAILIN FERTILIZER CO LTD
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Problems solved by technology

It can be seen that the use of ammonium dihydrogen phosphate is very extensive, but the purity requirements for the use of ammonium dihydrogen phosphate in industry and agriculture are relatively large, and the production method of industrial-grade ammonium dihydrogen phosphate mainly includes neutralization, and raw material phosphoric acid has heat There are two kinds of method phosphoric acid and wet method phosphoric acid; the process of thermal method monoammonium phosphate is that yellow phosphorus is burned and absorbed by water to generate high-concentration phosphoric acid, phosphoric acid is ammonized, centrifuged, ammonium phosphate liquid is concentrated, cooled and crystallized, and dried to obtain industrial grade phosphoric acid. Monoammonium phosphate; this method has the advantages of mature technology, less equipment investment, and stable product quality, but the biggest drawback is that thermal phosphoric acid has high energy consumption, large pollution, and high product cost; the process for producing industrial grade monoammonium phosphate by wet process phosphoric acid is Sulfuric acid decomposed pulp is extracted to prepare extracted wet-process phosphoric acid; wet-process phosphoric acid is purified and then reacted with ammonia gas to prepare high-purity industrial-grade monoammonium phosphate products
The production process of wet-process phosphoric acid is to purify wet-process phosphoric acid first, and then use purified acid for production. The process of this method is long and complicated. Due to the blockade of wet-process phosphoric acid purification technology, it cannot be popularized.
[0003] It can be seen that in the prior art, the production process of ammonium dihydrogen phosphate products is ubiquitous, the production energy consumption is high, the pollution is large, the material requirements for the equipment are relatively high, the process flow is complicated, the production cycle is long, and the quality of the product is obtained. Unstable, costly technical issues

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Examples

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Embodiment 1

[0040] A kind of production method of monoammonium phosphate, adopts high-purity urea phosphate and ammonia to directly carry out metathesis reaction to prepare monoammonium phosphate, and its reaction equation is:

[0041] CO(NH 2 ) 2 ·H 3 PO 4 +NH 3 =NH 4 h 2 PO 4 +CO(NH 2 ) 2

[0042] Specifically, the following steps are included:

[0043] (1) Preparation of urea phosphate solution: add water to the urea phosphate solid with a purity of 98% in a dissolution tank and measure it, heat it to a temperature of 40°C, stir to dissolve and mix evenly, and control the stirring speed to 30r / min to obtain phosphoric acid Urea solution;

[0044] (2) Synthesis of monoammonium phosphate: input the urea phosphate solution into the synthesis tank with a transfer pump, control the temperature at 40°C, and add ammonia to react according to the molar ratio of urea phosphate and ammonia at a ratio of 0.99:1; Ammonia was added, the stirring speed was 60-70r / min, and when the reaction...

Embodiment 2

[0048] A kind of production method of monoammonium phosphate, adopts high-purity urea phosphate and ammonia to directly carry out metathesis reaction to prepare monoammonium phosphate, and its reaction equation is:

[0049] CO(NH 2 ) 2 ·H 3 PO 4 +NH 3 =NH 4 h 2 PO 4 +CO(NH 2 ) 2

[0050] Specifically, the following steps are included:

[0051] (1) Preparation of urea phosphate solution: Add water to the urea phosphate solid with a purity of 98% in the dissolution tank and measure it. After heating up to 80°C, stir to dissolve and mix evenly, and control the stirring speed to 50r / min to obtain phosphoric acid Urea solution;

[0052] (2) Synthesis of monoammonium phosphate: input the urea phosphate solution into the synthesis tank with a transfer pump, control the temperature at 80°C, and add ammonia to react according to the molar ratio of urea phosphate and ammonia at a ratio of 1.05:1; Ammonia was added while stirring, the stirring speed was 70r / min, when the stir...

Embodiment 3

[0056] A kind of production method of monoammonium phosphate, adopts high-purity urea phosphate and ammonia to directly carry out metathesis reaction to prepare monoammonium phosphate, and its reaction equation is:

[0057] CO(NH 2 ) 2 ·H 3 PO 4 +NH 3 =NH 4 h 2 PO 4 +CO(NH 2 ) 2

[0058] Specifically, the following steps are included:

[0059] (1) Preparation of urea phosphate solution: Add water to the urea phosphate solid with a purity of 98% and measure it in a dissolution tank. After heating up to 60°C, stir to dissolve and mix evenly, and control the stirring speed to 40r / min to obtain phosphoric acid Urea solution;

[0060] (2) Synthesis of monoammonium phosphate: Input the urea phosphate solution into the synthesis tank with a delivery pump, control the temperature at 60°C, and add ammonia to react according to the molar ratio of urea phosphate and ammonia at a ratio of 1:1; Ammonia was added, the stirring speed was 65r / min, and when the stirring reaction wa...

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Abstract

The invention relates to the technical field of chemical engineering, and particularly relates to a production method for monoammonium phosphate. A monoammonium phosphate product is prepared by directly subjecting high pure urea phosphate and ammonia to a double decomposition reaction and reacting for 20-60 min with stirring by controlling a reaction temperature at 40-80 DEG C and a pH value at a reaction endpoint being 4.2-4.6, and through the steps of cooling for crystallization; separating by centrifugation and drying. Measurements of physical and chemical indexes of the produced product show that the physical and chemical indexes of the produced monoammonium phosphate product meet an industrial first level standard. Specifically, the total nutrient content of monoammonium phosphate is higher than 73%; the content of total nitrogen is 12.01-12.23%; the content of phosphorus pentoxide is 61.05-61.25%; the content of moisture is 0.35-0.52%; a pH value is 4.2-4.6; the content of water insoluble materials is 0.090-0.096%; and the content of fluoride is 0.15-0.19%.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for producing monoammonium phosphate. Background technique [0002] Ammonium dihydrogen phosphate, also known as monoammonium phosphate, with the rapid development of industry and agriculture, is widely used as a high-efficiency nitrogen and phosphate fertilizer in agriculture, and is used in industry as a fire retardant, fire coating additive and dry powder fire extinguisher for wood, paper, fabrics, etc. Agents, etc.; in the food industry, used as leavening agents, nutrients, etc. It can be seen that the use of ammonium dihydrogen phosphate is very extensive, but the purity requirements for the use of ammonium dihydrogen phosphate in industry and agriculture are relatively large, and the production method of industrial-grade ammonium dihydrogen phosphate mainly includes neutralization, and raw material phosphoric acid has heat There are two kinds of method p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28
Inventor 廖吉星彭宝林朱飞武石秀明韩朝应周勇
Owner GUIYANG KAILIN FERTILIZER CO LTD
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