Production method for special watermelon fertilizer as ammonium dihydrogen phosphate preparation byproduct

A technology of ammonium dihydrogen phosphate and its production method, which is applied in the direction of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc., can solve the problems of low purity of ammonium dihydrogen phosphate and the unavailability of active ingredients, and achieve the improvement of elemental The effect of content

Inactive Publication Date: 2015-03-04
GUIZHOU KAILIN GRP CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the process of producing ammonium dihydrogen phosphate from wet-process phosphoric acid, the purity of ammonium dihydrogen phosphate is not high, and the filtrate also contains a large amount of unprecipitated carbonamide, H 2 PO 4 ～ 、HPO 4 2～ 、PO 4 3～ and other substances, the researchers of the present invention have studied the composition content of traditional watermelon special fertilizer and the absorption situation of watermelon from a large amount of prior art documents and years of exploration and research, and have effectively explored the production of phosphoric acid diphosphate from wet-process phosphoric acid. Watermelon special fertilizer is prepared from the filtrate of ammonium hydrogen phosphate to solve the problem that the active ingredients in the filtrate of ammonium dihydrogen phosphate produced by wet-process phosphoric acid cannot be used. There is no report in domestic fertilizer production

Method used

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  • Production method for special watermelon fertilizer as ammonium dihydrogen phosphate preparation byproduct
  • Production method for special watermelon fertilizer as ammonium dihydrogen phosphate preparation byproduct
  • Production method for special watermelon fertilizer as ammonium dihydrogen phosphate preparation byproduct

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Experimental program
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Effect test

Embodiment 1

[0053] The present embodiment provides a kind of production method of preparing ammonium dihydrogen phosphate by-product watermelon special fertilizer, and its specific steps are as follows:

[0054] (1) Phosphoric acid and carbonamide prepared by wet-process phosphoric acid were mixed according to the molar ratio of 1.2:1, and the temperature was raised from 90°C to 160°C at a heating rate of 4°C / min, stirred and reacted for 5 hours, and the intermediate was isolated;

[0055] (2) Then add the intermediate and ammonia gas to distilled water and mix them. The molar ratio of ammonia gas to the intermediate is 1.2:1. Stir and react for 4 hours. After the reaction, obtain the slurry and place the slurry in cooling crystallization Cool the temperature in the device to 25°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment. The obtained filter cake is ammonium dihydrogen phosphate product, and th...

Embodiment 2

[0062] The present embodiment provides a kind of production method of preparing ammonium dihydrogen phosphate by-product watermelon special fertilizer, and its specific steps are as follows:

[0063](1) Phosphoric acid and carbonamide prepared by wet-process phosphoric acid were mixed according to the molar ratio of 1.6:1, and the temperature was raised from 90°C to 160°C at a heating rate of 7°C / min, stirred and reacted for 4 hours, and the intermediate was isolated;

[0064] (2) Then add the intermediate and ammonia gas into distilled water and mix them. The molar ratio of ammonia gas and intermediate gas is 1.4:1. Stir and react for 4 hours. After the reaction, obtain the slurry and place the slurry in cooling crystallization Cool the temperature in the device to 30°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment. The obtained filter cake is ammonium dihydrogen phosphate product, and ...

Embodiment 3

[0071] The present embodiment provides a kind of production method of preparing ammonium dihydrogen phosphate by-product watermelon special fertilizer, and its specific steps are as follows:

[0072] (1) Phosphoric acid and carbonamide prepared by wet-process phosphoric acid are mixed according to the molar ratio of 1.4:1, and the temperature is raised from 90°C to 160°C at a heating rate of 5°C / min, stirred and reacted for 4.5h, and the intermediate is separated;

[0073] (2) Then add the intermediate and ammonia gas to distilled water and mix them. The molar ratio of ammonia gas to the intermediate is 1.3:1. Stir and react for 3.5 hours. After the reaction, obtain the slurry and place the slurry in the cooling Cool down the temperature in the crystallizer to 27°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment, the obtained filter cake is ammonium dihydrogen phosphate product, and detec...

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Abstract

The invention relates to the technical field of chemical industry, in particular to a production method for a special watermelon fertilizer as an ammonium dihydrogen phosphate preparation byproduct. By changing temperature and other coefficients of wet process preparation of ammonium dihydrogen phosphate from phosphoric acid, the purity of the ammonium dihydrogen phosphate product is improved, also a compound fertilizer containing compound forms of N, P and K can be produced, the purity of ammonium dihydrogen phosphate can be enhanced, the produced special watermelon fertilizer has good absorptivity, and meanwhile formaldehyde is added to the filtrate to make a controlled release compound fertilizer. The produced special watermelon fertilizer can meet the nutritional needs of each period in the growth cycle, greatly increases the watermelon yield, and is an efficient compound fertilizer.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing ammonium dihydrogen phosphate by-product watermelon special fertilizer. Background technique [0002] In addition to a large amount of water, ripe watermelon fruit has a sugar content of 5-12%, including glucose, fructose and sucrose. The sweetness increases with the increase of sucrose in the late stage of ripening. It does not contain starch, and the sweetness will decrease during postharvest storage. Decreased by hydrolysis of disaccharides to monosaccharides. Melon seeds can be used as tea, and melon skin can be processed into watermelon sauce. In traditional Chinese medicine, melon juice and melon rind are used as medicine to clear away summer heat. It is a favorite fruit of people. It has the title of the king of fruits in summer and has the effect of relieving summer heat and quenching thirst. [0003] Due to the large amount ...

Claims

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Application Information

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IPC IPC(8): C01B25/28C05G1/00C05B7/00C05C9/02
Inventor 李凯高贵龙廖吉星陈肖虎石秀明薛涛朱飞武赵伟毅曾舒
Owner GUIZHOU KAILIN GRP CO LTD
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