Urea phosphate production method

A technology of urea phosphate and phosphoric acid solution, applied in ammonium orthophosphate fertilizers, chemical instruments and methods, alkaline orthophosphate fertilizers, etc., can solve the problem of low total recovery rate of phosphorus and nitrogen, inability to continuously produce feed products, and production costs Advanced problems, to achieve the effect of increasing hydrogen ion concentration, low cost, and low production cost

Active Publication Date: 2012-03-28
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But above-mentioned two kinds of methods all exist the phosphorus in the product, the total recovery rate of nitrogen is low, and industria

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 adopts the inventive method to produce urea phosphate

[0042] The indicators of the raw material phosphoric acid used are shown in Table 1.

[0043] The index of table 1 raw material phosphoric acid

[0044]

[0045] Follow the steps below for production:

[0046] (1) add sulfuric acid to raw material phosphoric acid, heat up and react:

[0047] Phosphoric acid from the wet system, temperature 72 ° C, through the phosphoric acid flow meter at 1.45m 3 The flow rate of / h enters the acid distribution tank and the sulfuric acid (sulfuric acid concentration 98wt%) from the sulfuric acid storage tank is measured by 0.087m 3 The flow rate of / h is used for acid mixing, and the stirring and mixing are pumped into the heat exchanger for circulation heating. The heating medium is low-pressure steam, the pressure is 0.2-0.6MPa, the mixed acid solution is heated to 75-80°C, and the outlet valve of the circulation pump is opened to continue Supply acid to the r...

Embodiment 2

[0057] Embodiment 2 adopts the inventive method to produce urea phosphate

[0058] The indicators of the raw material phosphoric acid used are shown in Table 3.

[0059] Table 3 Index of Raw Phosphoric Acid

[0060] P 2 o 5 %

SO 3 %

F％

Mg%

As%

Pb%

Exterior

specific gravity

54.0

1.36

0.40

2.4

0.0030

0.0004

brownish yellow liquid

1.66

[0061] Follow the steps below for production:

[0062] (1) add sulfuric acid to raw material phosphoric acid, heat up and react:

[0063] Phosphoric acid from the wet process system, temperature 72 ° C, through the phosphoric acid flow meter at 1.24m 3 The flow rate of / h enters the acid distribution tank and the sulfuric acid (sulfuric acid concentration 93wt%) from the sulfuric acid storage tank is measured by sulfuric acid at 0.060m 3 The flow rate of / h is used to prepare acid, and the stirring and mixing are pumped into the heat exchange...

Embodiment 3

[0073] Embodiment 3 adopts the inventive method to produce urea phosphate

[0074] The indicators of the raw material phosphoric acid used are shown in Table 5.

[0075] Table 5 Index of Raw Phosphoric Acid

[0076] P 2 o 5 %

SO 3 %

F％

Mg%

As%

Pb%

Exterior

specific gravity

58.0

2.36

0.30

2.3

0.0030

0.0004

brownish yellow liquid

1.72

[0077] Follow the steps below for production:

[0078] (1) add sulfuric acid to raw material phosphoric acid, heat up and react:

[0079] Phosphoric acid from the wet system, temperature 72 ° C, through the phosphoric acid flow meter at 1.45m 3 The flow rate of / h enters the acid distribution tank and the sulfuric acid (sulfuric acid concentration 98wt%) from the sulfuric acid storage tank is measured by sulfuric acid at 0.050m 3 The flow rate of / h is used to prepare acid, and the stirring and mixing are pumped into the heat exchanger for ci...

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Abstract

The invention relates to a urea phosphate production method, belonging to the field of chemical techniques. The technical problem solved by the invention is to provide a urea phosphate production method which is lower in production cost. The urea phosphate production method provided by the invention comprises the following steps of: a, mixed acidic solution preparation: adding a sulfuric acid into a phosphoric acid solution so as to obtain a mixed acidic solution; b, slurry preparation: heating the mixed acidic solution to 75-95 DEG C, then adding a reaction amount of urea into the mixed acidic solution, and stirring the obtained mixture so as to react the mixture, thereby obtaining a slurry; c, primary cooling crystallization: cooling the slurry to 45-65 DEG C so as to obtain a crystal-containing solution, filtering the crystal-containing solution so as to obtain crystals and filtrate, and then drying the obtained crystals so as to obtain urea phosphates; and d, secondary cooling crystallization: cooling the filtrate obtained in the step c to 20-25 DEG C, separating supernatant liquid to obtain lower thick liquid, mixing the lower thick liquid with the slurry obtained in the step b, and then operating the obtained mixture according to the step c.

Description

technical field [0001] The invention relates to a method for producing urea phosphate, which belongs to the technical field of chemical industry. Background technique [0002] Urea phosphate is an excellent feed additive. It can be used as animal feed additive and silage preservative. It provides two nutrients, phosphorus and non-protein nitrogen, for livestock, and has a great effect on increasing the milk production of livestock. Urea phosphate is also a It is a high-concentration nitrogen-phosphorus compound fertilizer, suitable for alkaline soil, and has the effect of increasing the yield of rice, wheat, rape and other crops; urea phosphate can also be used as a flame retardant, metal surface treatment agent, ammonium polyphosphate and purification of wet-process phosphoric acid Intermediates, fermentation nutrients, cleaning agents, etc. [0003] The synthesis process route of urea phosphate can be divided into wet phosphoric acid method, thermal phosphoric acid method...

Claims

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Application Information

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IPC IPC(8): C07C275/02C07C273/02C05B7/00
CPCY02P20/50
Inventor 李进王佳才李顺方石建华曾春华马永强邹建
Owner GUIZHOU CHANHEN CHEM CO LTD
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