Method for preparing ammonium dihydrogen phosphate and preparing special fertilizer for sorghum as byproduct

A special fertilizer for sorghum, ammonium dihydrogen phosphate technology, applied in the direction of phosphate, phosphorus oxyacid, application, etc., can solve the problems of not meeting the needs of sorghum nutrient elements, pollute the environment, low absorption rate, etc., and achieve significant environmental protection value , the effect of significant economic value and low production cost

Inactive Publication Date: 2015-01-28
GUIZHOU UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the purpose of the present invention is to provide a method for preparing ammonium dihydrogen phosphate and by-product special fertilizer for sorghum, so as to solve the problem that the combination of nutrient elements in the existing fertilizer does not meet the needs of sorghum for nutrient elements, resulting in the use of sorghum The rate of fertilizer absorption by sorghum is low, and some elemental compounds remain in the soil, changing the structure of the soil and polluting the environment
At the same time, it solves the waste of a large amount of ammonium dihydrogen phosphate caused by incomplete crystallization of ammonium dihydrogen phosphate in the process of preparing ammonium dihydrogen phosphate products, and the excessive crystallization of ammonium dihydrogen phosphate will bring the ammonium dihydrogen phosphate product A large number of impurities, which in turn makes the technical problem of lower purity of the ammonium dihydrogen phosphate product

Method used

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  • Method for preparing ammonium dihydrogen phosphate and preparing special fertilizer for sorghum as byproduct
  • Method for preparing ammonium dihydrogen phosphate and preparing special fertilizer for sorghum as byproduct
  • Method for preparing ammonium dihydrogen phosphate and preparing special fertilizer for sorghum as byproduct

Examples

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Effect test

Embodiment 1

[0039] A method for preparing ammonium dihydrogen phosphate and by-product special fertilizer for sorghum, comprising the steps of:

[0040] (1) Preparation of intermediates: first add phosphoric acid and carbonamide into the reaction kettle, then raise the temperature of the two mixtures to 90°C at a heating rate of 5°C / min, react for 180 minutes, and then cool the temperature to 20°C Crystallization, and centrifugation to obtain an intermediate, the molar ratio of phosphoric acid and carbonamide is 1.2:1;

[0041] (2) Preparation of ammonium dihydrogen phosphate: the intermediate obtained in step (1) is sent into the reactor, and ammonia gas is passed into the reactor, the mol ratio of ammonia gas to the intermediate is 1.3:1, and the reaction is controlled The time is 40min, the stirring speed is 200r / min, the reaction temperature is 15°C, and the pH value is adjusted to 8.5. After the reaction is completed, the obtained slurry is added to the cooling crystallizer to circul...

Embodiment 2

[0049] (1) Preparation of intermediate: first add phosphoric acid and carbonamide into the reaction kettle, then raise the temperature of the two mixtures to 110°C at a heating rate of 5°C / min, react for 220 minutes, and then cool the temperature to 40°C Crystallization, and centrifugation to obtain an intermediate, the molar ratio of phosphoric acid and carbonamide is 1.4:1;

[0050] (2) Preparation of ammonium dihydrogen phosphate: the intermediate obtained in step (1) is sent into the reactor, and ammonia is passed into the reactor, the mol ratio of ammonia to the intermediate is 1.5:1, and the reaction is controlled The time is 60min, the stirring speed is 250r / min, the reaction temperature is 25°C, and the pH value is adjusted to 9.5. After the reaction is completed, the obtained slurry is added to the cooling crystallizer to circulate crystallization, and the filtrate is detected and analyzed at the same time. When the nitrogen content is 11%, and the phosphorus pentoxid...

Embodiment 3

[0058] (1) Preparation of intermediate: first add phosphoric acid and carbonamide into the reaction kettle, then raise the temperature of the two mixtures to 100°C at a heating rate of 5°C / min, react for 200 minutes, and then cool the temperature to 30°C Crystallization, and centrifugation to obtain an intermediate, the molar ratio of phosphoric acid to carbonamide is 1.3:1;

[0059] (2) Preparation of ammonium dihydrogen phosphate: the intermediate obtained in step (1) is sent into the reactor, and ammonia is passed into the reactor, and the mol ratio of ammonia to the intermediate is 1.4:1, and the reaction is controlled The time is 50min, the stirring speed is 220r / min, the reaction temperature is 20°C, and the pH value is adjusted to 9. After the reaction is completed, the obtained slurry is added to the cooling crystallizer to circulate crystallization, and the filtrate is detected and analyzed at the same time. When the nitrogen content is 10%, and the phosphorus pentoxi...

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Abstract

The invention relates to the technical field of chemical industry, and discloses a preparation method of a special fertilizer for sorghum as a byproduct. The method comprises the following steps: analyzing the ratio of nutritional elements required by the growth of sorghum by detecting the amounts of absorption of all the nutritional elements from soil in the growth process of sorghum, reacting phosphoric acid with carbomite to generate an intermediate, introducing ammonia gas into the intermediate to produce ammonium dihydrogen phosphate, crystallizing parts of ammonium dihydrogen phosphate to precipitate, adjusting the ratio of nutritional elements in a reaction solution to meet the growth of sorghum, and adding other nutritional elements required by sorghum in order to prepare the special fertilizer for sorghum. The preparation method has the advantages of full utilization of raw materials, good quality of the prepared ammonium dihydrogen phosphate, and low cost of the prepared special fertilizer for sorghum.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing ammonium dihydrogen phosphate and by-product special fertilizer for sorghum. Background technique [0002] Ammonium dihydrogen phosphate, also known as monoammonium phosphate, is a chemical agent, a white crystal that decomposes into ammonium metaphosphate when heated. Ammonium dihydrogen phosphate can be used as a fertilizer and a fire retardant for wood, paper, and fabrics, as well as pharmaceuticals and ruminant feed additives. At present, the ammonium monohydrogen phosphate metathesis method used in the preparation of ammonium dihydrogen phosphate. It feeds water, potassium chloride, and ammonium bicarbonate in proportion, then adds a specified amount of phosphoric acid, stirs fully, adjusts the pH value, heats and concentrates, cools and crystallizes, centrifuges, and dries to obtain the product. The resulting concentrated mother liquor is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C05G1/06
Inventor 陈肖虎廖吉星高贵龙郑超李军旗王先炜薛涛韩朝应曾舒赵平原
Owner GUIZHOU UNIV
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