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A kind of preparation method of Poria cocos special fertilizer

A special fertilizer, Poria technology, applied in the field of preparation of special fertilizer for Poria, can solve the problems of low purity of sodium dihydrogen phosphate product, large introduction of sodium dihydrogen phosphate product, not meeting the needs of the growth of Poria cocos, etc., and achieves significant environmental protection value and economic benefits, make up for the cost of impurity removal, and achieve significant economic benefits

Inactive Publication Date: 2017-02-15
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a preparation method of special fertilizer for Poria cocos, to solve the problem that the nutrient element ratio of the existing fertilizer does not meet the needs of Poria cocos growth, resulting in part of the nutrient elements remaining in the soil to change the soil structure
At the same time, in the process of preparing sodium dihydrogen phosphate products, incomplete crystallization of sodium dihydrogen phosphate will cause a large amount of waste of sodium dihydrogen phosphate, and excessive crystallization of sodium dihydrogen phosphate will bring a large amount of sodium dihydrogen phosphate products. Impurities, and then make the technical problem that the purity of sodium dihydrogen phosphate product is lower

Method used

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  • A kind of preparation method of Poria cocos special fertilizer
  • A kind of preparation method of Poria cocos special fertilizer
  • A kind of preparation method of Poria cocos special fertilizer

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Embodiment 1

[0039] A preparation method of special fertilizer for poria cocos, using phosphoric acid and carbonamide in a molar ratio of 1.1:1 and mixing them in a reactor, then raising the temperature of the two mixtures to 100°C at a heating rate of 5°C / min, and stirring for 120 minutes , then cool the temperature to 35°C at a speed of 3°C / min, and then centrifuge to obtain the urea phosphate intermediate; add the intermediate and sodium hydroxide to the reactor at a molar ratio of 1:1 to mix and react, and adjust the reaction The pH value of the solution is 8, and the stirring speed is 200r / min to stir the reaction for 60min. After the reaction is over, obtain a slurry containing nitrogen and phosphorus, which is placed in a cooling crystallizer for circulation crystallization treatment, and simultaneously detects and analyzes the filtrate. When the filtrate When the nitrogen content is 14% and the phosphorus content is 2%, stop crystallization and filter, the filter cake is sodium dihy...

Embodiment 2

[0042] The preparation method of the special fertilizer for poria cocos is to add phosphoric acid and carbonamide into the reactor at a molar ratio of 1.3:1 and mix them, then raise the temperature of the two mixtures to 120°C at a heating rate of 5°C / min, stir and react for 100min, and then Cool the temperature to 45°C at a speed of 3°C / min, and then centrifuge to obtain the urea phosphate intermediate; add the intermediate and sodium hydroxide to the reactor at a molar ratio of 1:1.2 to mix and react, and adjust the pH of the reaction Value is 9, and stirring speed is 250r / min stirring reaction 40min, and after reaction finishes, obtain the slurry containing nitrogen, phosphorus and potassium, place this slurry in cooling crystallizer and circulate crystallization treatment, detect and analyze filtrate simultaneously, when nitrogen in filtrate When the phosphorus content is 16% and the phosphorus content is 3%, stop crystallization and filter, the filter cake is sodium dihydr...

Embodiment 3

[0045] The preparation method of the special fertilizer for poria cocos is to add phosphoric acid and carbonamide into the reactor and mix them in a molar ratio of 1.2:1, then raise the temperature of the two mixtures to 110°C at a heating rate of 5°C / min, stir and react for 110min, and then Cool the temperature to 40°C at a speed of 3°C / min, and then centrifuge to obtain the urea phosphate intermediate; add the intermediate and sodium hydroxide to the reactor at a molar ratio of 1:1.1 to mix and react, and adjust the pH of the reaction Value is 8.5, stirring speed is 220r / min stirring reaction 50min after the reaction finishes, obtain the slurry containing nitrogen phosphorus potassium, this slurry is placed in the cooling crystallizer circulation crystallization process, detects and analyzes filtrate simultaneously, when the nitrogen content in the filtrate When the phosphorus content is 15% and the phosphorus content is 2.5%, stop crystallization and filter, the filter cake ...

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Abstract

The invention relates to the technical field of chemical engineering, and discloses a preparation method of a special fertilizer for Poria cocos. Through analysis of the nutrient elements required in the growth process of Poria cocos, phosphoric acid and carbamide are subjected to reaction for the preparation of an intermediate; then the intermediate reacts with alkaline potassium to prepare sodium dihydrogen phosphate; through control of nutrient content ratio of the filtrate in the crystallization processes of sodium dihydrogen phosphate, potassium and other trace elements are added to the filtrate with sodium dihydrogen phosphate separated to prepare the special fertilizer for Poria cocos. The method not only improves the purity of sodium dihydrogen phosphate, and through the analysis of the ratio of nutrient elements required in the growth process of Poria cocos, the prepared special fertilizer can achieve high yield with a small fertilizer amount.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a preparation method of special fertilizer for poria cocos. Background technique [0002] Sodium dihydrogen phosphate is the raw material for manufacturing sodium hexametaphosphate and sodium pyrophosphate, mainly used in tanning, boiler water treatment, as a quality improver and baking powder, and as a buffer and fermentation powder in the food industry and fermentation industry Raw materials, also used as feed additives, detergents and dyeing auxiliaries. Sodium dihydrogen phosphate is colorless crystal or white crystalline powder, odorless, salty and sour. Heating to 100°C loses all crystal water, and turns into sodium metaphosphate when heated. Soluble in water, almost insoluble in ethanol, its aqueous solution is acidic. At present, there are two commonly used methods for preparing sodium dihydrogen phosphate, one is sodium dihydrogen phosphate neutralization...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00
CPCC01B25/305C05B15/00C05D5/00C05D9/02
Inventor 陈肖虎郑培俊高贵龙廖吉星喻茂薛涛罗春晖赵伟毅曾舒黄芳
Owner GUIZHOU UNIV
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