Preparation method of specific fertilizer for Poria cocos

A technology of special fertilizer and poria cocos, which is applied in the field of preparation of special fertilizer for poria cocos, can solve the problems of low purity of sodium dihydrogen phosphate products, large carry-over of sodium dihydrogen phosphate products, and failure to meet the needs of poria cocos growth, achieving significant environmental protection value and economic benefits, making up for the cost of impurity removal, and the effect of significant economic benefits

Inactive Publication Date: 2015-01-28
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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  • Preparation method of specific fertilizer for Poria cocos
  • Preparation method of specific fertilizer for Poria cocos
  • Preparation method of specific fertilizer for Poria cocos

Examples

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Effect test

Embodiment 1

[0039] A method for preparing a special fertilizer for Poria cocos. Phosphoric acid and carbonamide are added to a reaction kettle at a molar ratio of 1.1:1 to mix, and then the temperature of the two mixtures is raised to 100°C at a temperature rise rate of 5°C / min, and the reaction is stirred for 120 minutes. , then the temperature was cooled to 35°C at a speed of 3°C / min, and then centrifuged to obtain the urea phosphate intermediate; the intermediate and sodium hydroxide were added to the reaction kettle at a molar ratio of 1:1 to mix and react, and the reaction was adjusted. The pH value is 8, the stirring speed is 200r / min and the reaction is stirred for 60min. After the reaction is completed, a slurry containing nitrogen and phosphorus is obtained, and the slurry is placed in a cooling crystallizer for circulating crystallization treatment. When the nitrogen content is 14% and the phosphorus content is 2%, stop crystallization and filter, and the filter cake is a sodium ...

Embodiment 2

[0042] The preparation method of the special fertilizer for Poria cocos is: phosphoric acid and carbonamide are added into the reaction kettle at a molar ratio of 1.3:1 and mixed, then the temperature of the two mixtures is raised to 120°C at a heating rate of 5°C / min, and the reaction is stirred for 100 minutes, and then The temperature was cooled to 45°C at a speed of 3°C / min, and then the urea phosphate intermediate was obtained by centrifugation; the intermediate and sodium hydroxide were added to the reaction kettle at a molar ratio of 1:1.2 to mix and react, and the pH of the reaction was adjusted. The value is 9, the stirring speed is 250r / min and the reaction is stirred for 40min. After the reaction is completed, a slurry containing nitrogen, phosphorus and potassium is obtained, and the slurry is placed in a cooling crystallizer for circulating crystallization treatment. At the same time, the filtrate is detected and analyzed. When the content is 16% and the phosphorus...

Embodiment 3

[0045] The preparation method of the special fertilizer for Poria cocos is: phosphoric acid and carbonamide are added into the reaction kettle at a molar ratio of 1.2:1 and mixed, then the temperature of the two mixtures is raised to 110°C at a heating rate of 5°C / min, and the reaction is stirred for 110 minutes, and then The temperature was cooled to 40°C at a speed of 3°C / min, and then the urea phosphate intermediate was obtained by centrifugation; the intermediate and sodium hydroxide were added to the reaction kettle at a molar ratio of 1:1.1 to mix and react, and the pH of the reaction was adjusted. The value is 8.5, and the stirring speed is 220 r / min. After the reaction is completed for 50 minutes, a slurry containing nitrogen, phosphorus and potassium is obtained, and the slurry is placed in a cooling crystallizer for cyclic crystallization treatment, and the filtrate is detected and analyzed at the same time. When it is 15% and the phosphorus content is 2.5%, stop crys...

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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 Applications(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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