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Production method for preparing monopotassium phosphate and by-product special fertilizer for Taxus chinensis

A technology of potassium dihydrogen phosphate and its production method, which is applied in the direction of chemical instruments and methods, applications, phosphorus compounds, etc., which can solve the problems of low purity of potassium dihydrogen phosphate and unusable active ingredients in the filtrate, and achieve good absorption rate Effect

Inactive Publication Date: 2015-02-04
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In the process of producing potassium dihydrogen phosphate from wet-process phosphoric acid, the purity of potassium dihydrogen phosphate is not high, and the filtrate also contains a large amount of unprecipitated carbonamide, K + 、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 the traditional yew special fertilizer and the absorption of the yew from a large number of prior art documents and years of exploration and research, and have effectively explored the production of phosphoric acid from wet process. The special fertilizer for yew is produced from the filtrate of potassium dihydrogen phosphate, which solves the problems that the purity of potassium dihydrogen phosphate produced by wet process phosphoric acid is not high, and the active ingredients in the filtrate cannot be used. At the same time, the special fertilizer has good absorption rate and controlled release. Effect, in the domestic fertilizer production, there is no report

Method used

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  • Production method for preparing monopotassium phosphate and by-product special fertilizer for Taxus chinensis
  • Production method for preparing monopotassium phosphate and by-product special fertilizer for Taxus chinensis
  • Production method for preparing monopotassium phosphate and by-product special fertilizer for Taxus chinensis

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Effect test

Embodiment 1

[0069] A kind of production method of preparing potassium dihydrogen phosphate by-product yew special fertilizer provided by this embodiment mainly includes the following steps:

[0070] 1) Mix phosphoric acid and carbonamide at a molar ratio of 1.2:1, heat up from 80°C to 160°C at a heating rate of 6°C / min, stir and react for 4-5 hours, and separate the intermediate; then use the intermediate and The basic potassium salt is mixed according to the molar ratio of 1:1.4, and the pH value is adjusted to 8.5. After the reaction is completed, a slurry containing nitrogen, phosphorus, and potassium is obtained, and the slurry containing nitrogen, phosphorus, and potassium is placed in a cooling crystallizer Lower the temperature to 35-40°C in the middle, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment, the obtained filter cake is potassium dihydrogen phosphate product, and detect the component co...

Embodiment 2

[0079] A kind of production method of preparing potassium dihydrogen phosphate by-product yew special fertilizer provided by this embodiment mainly includes the following steps:

[0080] 1) Mix phosphoric acid and carbonamide at a molar ratio of 1.5:1, heat up from 80°C to 160°C at a heating rate of 6°C / min, stir and react for 4-5 hours, and separate the intermediate; then use the intermediate and The basic potassium salt is mixed according to the molar ratio of 1:1.1, and the pH value is adjusted to 8.5. After the reaction is completed, a slurry containing nitrogen, phosphorus, and potassium is obtained, and the slurry containing nitrogen, phosphorus, and potassium is placed in a cooling crystallizer Lower the temperature to 35-40°C in the middle, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment, the obtained filter cake is potassium dihydrogen phosphate product, and detect the component co...

Embodiment 3

[0089] A kind of production method of preparing potassium dihydrogen phosphate by-product yew special fertilizer provided by this embodiment mainly includes the following steps:

[0090] 1) Mix phosphoric acid and carbonamide at a molar ratio of 1.3:1, and raise the temperature from 80°C to 160°C at a heating rate of 6°C / min, stir and react for 4-5 hours, and separate the intermediate; then use the intermediate and The basic potassium salt is mixed according to the molar ratio of 1:1.3, and the pH value is adjusted to 8.7. After the reaction is completed, a slurry containing nitrogen, phosphorus, and potassium is obtained, and the slurry containing nitrogen, phosphorus, and potassium is placed in cooling crystallization Cool the temperature in the device to 35-40°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment, the obtained filter cake is potassium dihydrogen phosphate product, and detec...

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Abstract

The invention relates to the field of chemical technique, especially to a production method for preparing monopotassium phosphate and a by-product a special fertilizer for Taxus chinensis. By changing coefficients such as temperature and the like of wet-process phosphoric acid preparation of monopotassium phosphate, purity of the product monopotassium phosphate is raised, and a compound fertilizer containing N, P and K combined forms can simultaneously be produced. In addition, formaldehyde is added into a filtrate to prepare a controlled-release compound fertilizer. By the method, purity of monopotassium phosphate can be raised, and the produced special fertilizer for Taxus chinensis has good absorptivity. Meanwhile, the produced special fertilizer for Taxus chinensis can meet nutritional requirements of each period of growth cycle of Taxus chinensis. The special fertilizer 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 a special fertilizer for yew by-product of potassium dihydrogen phosphate. Background technique [0002] Potassium dihydrogen phosphate is widely used in almost all types of crops such as various types of economic crops, grain, melons and fruits, vegetables, etc. It has the effect of overcoming the nutrient deficiency caused by the aging and absorption capacity of the root system in the later stage of crop growth. It is a new type of high-concentration phosphorus and potassium two-element compound fertilizer, and it is an efficient phosphorus and potassium compound fertilizer in agriculture. At present, many domestic fertilizer manufacturers are producing potassium dihydrogen phosphate compound fertilizer. The production methods mainly include neutralization method, extraction method, ion exchange method, metathesis method, direct metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C05G1/00
Inventor 陈肖虎廖吉星何敏蔺忠建李军旗周勇赵伟毅熊陈杰黄芳金会心
Owner GUIZHOU UNIV
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