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A kind of method for preparing cyanuric acid

A cyanuric acid, crude technology, applied in the direction of organic chemistry, etc., can solve the problems of long reaction time of atmospheric pressure equipment, hidden safety hazards of hydrolysis constant temperature tank, long reaction time, etc., to reduce land occupation and test costs, and reduce operating labor intensity , the effect of short reaction time

Active Publication Date: 2021-11-09
河北冀衡集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The reaction time of the atmospheric pressure device is long, and the constant temperature time is as long as 8 hours; although the pressure device is short, it still takes 3 hours, and there are major safety hazards in the process of heating and pressurizing the hydrolysis constant temperature tank;
[0004] 2) A large amount of heat needs to be supplemented externally, resulting in high steam consumption
[0005] 3) Due to the large particle size of crude products after traditional crushing, long reaction time and low efficiency, devices of the same scale occupy a large area and require high investment;
[0006] 4) High energy consumption: due to the long reaction time, 0.5 tons of steam is required to produce 1 ton of cyanuric acid

Method used

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  • A kind of method for preparing cyanuric acid
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method for preparing cyanuric acid, comprising:

[0046] (1) Mixing crude cyanuric acid and water with a mass ratio of 1:3 to prepare a mixture liquid;

[0047] (2) Transport the mixed material liquid to the pin-type nano-sand mill and perform nano-wet sand grinding (wherein the wet grinding adopts zirconia beads with a diameter of 0.6-1.2 mm, and the zirconia beads account for the volume of the grinding chamber. 85% or so) to obtain a crude product slurry comprising 0.1-10 micron crude cyanuric acid particles;

[0048] (3) react 25 minutes under the effect of saturated steam (0.35MPa, 175 ℃) under the effect of the crude product slurry that will comprise crude cyanuric acid particle and dilute sulfuric acid (stirring speed is 160 rev / min), then Cool down to below 40°C;

[0049] (4) The material after cooling is washed with water and suction filtered, then sampled and tested for pH value (PH value 4.0) and moisture content (moisture content is 30%). Put it into a l...

Embodiment 2

[0056] A method for preparing cyanuric acid, comprising:

[0057] (1) Mixing crude cyanuric acid and water with a mass ratio of 1:3 to prepare a mixture liquid;

[0058] (2) Transport the mixed material liquid to the pin-type nano-sand mill and perform nano-wet sand grinding (wherein the wet grinding adopts zirconia beads with a diameter of 0.6-1.2 mm, and the zirconia beads account for the volume of the grinding chamber. 85% or so) to obtain a crude product slurry comprising 0.1-10 micron crude cyanuric acid particles;

[0059] (3) react 15 minutes under the effect of saturated steam (0.4MPa, 180 ℃) under the effect of the crude product slurry that will comprise crude cyanuric acid particles and dilute sulfuric acid (stirring speed is 170 rev / min), then Cool down to below 40°C;

[0060] (4) The material after cooling is washed with water and suction filtered, then sampled and tested for pH value (PH value 4.0) and moisture content (moisture content is 30%). Put it into a l...

Embodiment 3

[0067] A method for preparing cyanuric acid, comprising:

[0068] (1) Mixing crude cyanuric acid and water with a mass ratio of 1:3 to prepare a mixture liquid;

[0069] (2) Transport the mixed material liquid to the pin-type nano-sand mill and perform micron wet sand grinding (wherein the wet grinding adopts zirconia beads with a diameter of 1.6-2 mm, and the zirconia beads account for the volume of the grinding chamber. 85% or so) to obtain a crude product slurry comprising crude cyanuric acid particles greater than 10 microns, wherein the crude cyanuric acid particle size range is 10-20 microns;

[0070] (3) The crude product slurry and dilute sulfuric acid (24%) that will comprise crude cyanuric acid particles were stirred under the effect of saturated steam (0.4MPa, 180 ℃) and reacted for 3 hours (stirring speed was 170 rev / min), after that Cool down to below 40°C;

[0071] (4) The material after cooling is washed with water and suction filtered, then sampled and tested...

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Abstract

The invention discloses a method for preparing cyanuric acid. The method comprises: a wet grinding step: wet grinding crude cyanuric acid to obtain micron-sized crude cyanuric acid particles; a hydrolysis refining step: grinding the crude cyanuric acid Particles and dilute sulfuric acid are reacted while stirring under the action of saturated steam, and then the temperature is lowered to obtain refined cyanuric acid; washing step: the refined cyanuric acid is washed with water, suction filtered, and dried to obtain refined cyanuric acid. The present invention has a short hydrolysis constant temperature refining reaction time and only needs 0.03 tons of steam consumption per ton of product; the energy consumption is lower than 0.025 tons of standard coal.

Description

technical field [0001] The invention relates to the field of preparation of cyanuric acid, in particular to a method for preparing cyanuric acid. Background technique [0002] At present, the domestic traditional cyanuric acid hydrolysis production process basically uses the crude cyanuric acid product with a content of about 75-80% to be crushed by a Raymond mill to obtain cyanuric acid powder with a particle size of about 1 mm in diameter. Then after pulping, adding sulfuric acid to hydrolyze and refine, finally cool down, wash with water, and dry to obtain qualified cyanuric acid products. This production process has a history of 30 years in our country. Its main feature is that it adopts traditional crushing, normal pressure or pressurized hydrolysis and refining production. The main problems of this process are: [0003] 1) The reaction time of the atmospheric pressure device is long, and the constant temperature time is as long as 8 hours; although the pressure device...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D251/32
CPCC07D251/32
Inventor 王平生张俊杰赵建威王海秋徐永玉
Owner 河北冀衡集团有限公司