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Method for changing crystal morphology of ammonium dihydrogen phosphate by using additive

A technology of ammonium dihydrogen phosphate and additives, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of not improving product purity, reducing fertilizer effectiveness, and incomplete evaporation, so as to reduce mother liquor entrainment and residue, easy to filter and Drying, application value-enhancing effects

Active Publication Date: 2014-02-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to incomplete evaporation during the spray process, the water content of the particles is as high as 3%.
[0006] Currently commercially available ammonium dihydrogen phosphate crystalline products have irregular shapes, see attached figure 1 , the main particle size is 0.2-0.4mm, the crystal is finely broken, the surface is rough, and the crystal plane is incomplete, which affects the purity, bulk density, fluidity and other properties of the product
When ammonium dihydrogen phosphate is used as a fertilizer, due to the small particle size and low bulk density of the powdered product, it is easy to blow away with the wind after being sprinkled into the field, reducing the fertilizer effectiveness
In order to increase its particle size and specific gravity and be suitable for agricultural use, granulation technology is generally used to process it into spherical agglomerated particles with a larger specific gravity, but the granulation itself does not change the crystal form of ammonium dihydrogen phosphate and does not improve product purity.

Method used

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  • Method for changing crystal morphology of ammonium dihydrogen phosphate by using additive
  • Method for changing crystal morphology of ammonium dihydrogen phosphate by using additive
  • Method for changing crystal morphology of ammonium dihydrogen phosphate by using additive

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Take 30g of ammonium dihydrogen phosphate with a purity of 98%, 100g of deionized water, add 500ppm ethylenediaminetetraacetic acid, and stir evenly. The solution was heated to 45°C to dissolve, and the cooling crystallization method was adopted at a cooling rate of 2°C / h, and the temperature was lowered to 5°C. After washing, filtering and drying, rod-shaped ammonium dihydrogen phosphate crystals were obtained. The process quality yield is 35.8%, the product purity reaches 99.9%, the average radial particle size of the crystal is 0.84mm, and the axial particle size is 4.15mm. The electron microscope photo of the product is as follows figure 2 shown.

Embodiment 2

[0024] Take 70g of ammonium dihydrogen phosphate with a purity of 97.2%, 100g of deionized water, add 10000ppm nitrilotriacetic acid, stir evenly, continue to heat the solution to 60°C, and adopt the cooling crystallization method with a cooling rate of 6°C / h to 20°C. After washing, filtering and drying, rod-shaped ammonium dihydrogen phosphate crystals were obtained. The process quality yield is 62.42%, the product purity reaches 99.7%, the average radial particle size of the crystal is 1.00mm, and the axial particle size is 3.18mm. Electron microscope photos of products such as image 3 shown.

Embodiment 3

[0026] Take 60g of ammonium dihydrogen phosphate with a purity of 96%, 100g of deionized water, add 2000ppm succinic acid, and stir evenly. The solution was heated to 58°C to dissolve, and the cooling crystallization method was adopted at a cooling rate of 12°C / h, and the temperature was lowered to 10°C. After washing, filtering and drying, rod-shaped ammonium dihydrogen phosphate crystals were obtained. The process quality yield is 69.13%, the product purity reaches 99.6%, the average radial particle size of the crystal is 0.64mm, and the axial particle size is 4.03mm.

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Abstract

The invention provides a method for changing crystal morphology of ammonium dihydrogen phosphate by using an additive. The method comprises the following steps: mixing the ammonium dihydrogen phosphate with the purity of above 95% serving as the raw material and water in the mass fraction ratio of (30-85): 100, adding organic carboxylic acid or carboxylate as the additive, uniformly stirring, heating a solution to 45-65 DEG C for dissolution, and cooling to 5-35 DEG C by using a cooling crystallization process; and washing, filtering and drying so as to obtain a rod-shaped ammonium dihydrogen phosphate crystal. The rod-shaped ammonium dihydrogen phosphate crystal prepared by using the method has the advantages that the two ends of the rod-shaped ammonium dihydrogen phosphate crystal are in the shape of a rectangular pyramid, the average radial particle size of the crystal is 0.6-1.2mm, the axial particle size of the crystal is 3-5mm, the purity of the product is above 99.5%, the crystal product has high strength and good mobility and is easy to filter and dry, and the application value of the ammonium dihydrogen phosphate product is increased.

Description

technical field [0001] The invention belongs to the technical field of crystallization in the chemical engineering industry, and in particular relates to an additive and a method for changing the crystal form of ammonium dihydrogen phosphate. Background technique [0002] Ammonium dihydrogen phosphate, the English name is ammonium dihydrogen phosphate, also known as monoammonium phosphate, is a white crystal; the molecular formula is NH 4 h 2 PO 4 , with a relative molecular weight of 115.03, it will be decomposed into ammonium metaphosphate (NH 4 PO 3 ), which can be made by reacting ammonia water and phosphoric acid. Ammonium dihydrogen phosphate is easily soluble in water, slightly soluble in ethanol, and insoluble in acetone. Ammonium dihydrogen phosphate is mainly used as a fertilizer and a fire retardant for wood, paper, and fabrics, as well as pharmaceuticals and ruminant feed additives. [0003] The document Physica B-Condensed Matter404(2009)8-11:1611-1616 men...

Claims

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Application Information

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IPC IPC(8): C01B25/28
Inventor 张美景陈燕鑫陈巍侯宝红龚俊波尹秋响郝红勋鲍颖王召王永莉
Owner TIANJIN UNIV
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