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Production method for preparing ammonium dihydrogen phosphate byproduct special fertilizer for pumpkin

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., and can solve problems such as waste of resources, low purity of dipotassium hydrogen phosphate product, unusable active ingredients, etc. , to achieve the effect of increasing the content of elements

Inactive Publication Date: 2015-01-21
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] After the whole reaction is over, the carboxamide does not undergo any changes, and because of the high solubility of carboxamide, at 20°C, its solubility is 85g / 100ml (see "Phosphate Fertilizers and Compound Fertilizers" Volume 20 Issue 6 - Chemistry Fertilizer solubility and compound fertilizer production process), and the solubility of carbonamide increases with the increase of temperature, so after the carbonamide contained in the filtrate is precipitated by cooling crystals, the filtrate also contains a large amount of unprecipitated carbonamide, NH 4 + 、H 2 PO 4 ～ 、HPO 4 2～ 、PO 4 3～ , if the waste water is discharged directly, it will not only waste resources, but also cause waste of resources, and the purity of dipotassium hydrogen phosphate produced is not high
[0009] 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, NH 4 + 、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 pumpkin special fertilizer and the absorption situation of pumpkin from a large number 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. Pumpkin 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
[0010] 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 pumpkin special fertilizer and the absorption situation of pumpkin from a large number 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. Pumpkin 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 preparing ammonium dihydrogen phosphate byproduct special fertilizer for pumpkin
  • Production method for preparing ammonium dihydrogen phosphate byproduct special fertilizer for pumpkin
  • Production method for preparing ammonium dihydrogen phosphate byproduct special fertilizer for pumpkin

Examples

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Embodiment 1

[0056] This embodiment provides a kind of production method for preparing ammonium dihydrogen phosphate by-product pumpkin special fertilizer, comprising the following steps:

[0057] (1) The phosphoric acid solution prepared by wet-process phosphoric acid was mixed with carbonamide at a molar ratio of 1.1:1, and the temperature was raised from 90°C to 160°C at a heating rate of 5 minutes, stirred and reacted for 5 hours, and the intermediate was isolated;

[0058] (2) Then dissolve the intermediate in the phosphoric acid solution, the concentration of the phosphoric acid solution is 17%, adjust the pH of the solution at 3, and then feed ammonia gas into the solution, the ammonia gas and the intermediate are in a molar ratio of 1.1:1 , stirring and reacting for 3h, after the reaction is over, the obtained slurry is placed in a cooling crystallizer to cool down to 25°C, and crystallization and filtration are carried out, and the filtrate is circulated and crystallized in the coo...

Embodiment 2

[0063] This embodiment provides a kind of production method for preparing ammonium dihydrogen phosphate by-product pumpkin special fertilizer, comprising the following steps:

[0064] (1) The phosphoric acid solution prepared by wet-process phosphoric acid was mixed with carbonamide at a molar ratio of 1.6:1, and the temperature was raised from 90°C to 160°C at a heating rate of 8°C / min, stirred for 4 hours, and the intermediate was isolated;

[0065] (2) Then dissolve the intermediate in the phosphoric acid solution, the concentration of the phosphoric acid solution is 20%, adjust the pH of the solution at 3.5, and then feed ammonia gas into the solution, the ammonia gas and the intermediate are in a molar ratio of 1.4:1 , stirring and reacting for 2 hours. After the reaction, the obtained slurry was placed in a cooling crystallizer to cool down to 30°C, and crystallization and filtration were carried out. The filtrate was circulated and crystallized in the cooling crystallize...

Embodiment 3

[0070] This embodiment provides a kind of production method for preparing ammonium dihydrogen phosphate by-product pumpkin special fertilizer, comprising the following steps:

[0071] (1) The phosphoric acid solution prepared by wet-process phosphoric acid is mixed with carbonamide at a molar ratio of 1.4:1, and the temperature is raised from 90°C to 160°C at a heating rate of 7°C / min, stirred and reacted for 4.5h, and the intermediate is isolated ;

[0072] (2) Then dissolve the intermediate in the phosphoric acid solution, the concentration of the phosphoric acid solution is 19%, adjust the pH of the solution at 3.2, and then feed ammonia gas into the solution, and the molar ratio of ammonia gas to the intermediate is 1.25:1 , stirred and reacted for 2.5h. After the reaction, the obtained slurry was placed in a cooling crystallizer to cool down to 27°C, and crystallization and filtration were performed. The filtrate was circulated and crystallized in the cooling crystallizer...

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Abstract

The invention relates to the technical field of chemical engineering and particularly relates to a production method for preparing an ammonium dihydrogen phosphate byproduct special fertilizer for pumpkin. By changing factors such as temperature for preparation of ammonium dihydrogen phosphate from phosphoric acid through a wet method, the purity of the ammonium dihydrogen phosphate product is improved and meanwhile, a compound fertilizer containing N, P and K compound states can be produced, the purity of ammonium dihydrogen phosphate can be improved, the absorption rate of the produced special fertilizer for pumpkin is good, a controlled-release compound fertilizer is produced by virtue of adding formaldehyde in the filtrate, the produced special fertilizer for pumpkin can meet the nutritional needs of various periods in a growth period and thus the yield of pumpkin is greatly increased and the special fertilizer for pumpkin is an effective 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 pumpkin special fertilizer. Background technique [0002] Pumpkins Pumpkins are plants in the Cucurbitaceae family. Because of the different places of origin, the names are different. Also known as wheat melon, pumpkin, pumpkin, golden wax gourd, it is called golden melon in Taiwanese, and it is native to Central and South America. Pumpkins are grown all over China, and in Japan, Hokkaido is the bulk. The tender fruit is sweet and palatable, and is one of the vegetables in summer and autumn. Old melons can be used as feed or miscellaneous grains, so they are also called rice melons in many places. In the West, pumpkin is often used to make pumpkin pie, that is, pumpkin pie. Pumpkin seeds can be used as snacks. Pumpkin is an annual vine herb, sown in spring, the flowering period is from May ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C05G1/00C05B7/00C05C9/02
Inventor 陈肖虎廖吉星何敏朱飞武王丽远彭宝林赵伟毅郑超曾舒黄芳
Owner GUIZHOU UNIV