Method for preparing ammonium dihydrogen phosphate and preparing special fertilizer for honeysuckle flower as byproduct

A technology of ammonium dihydrogen phosphate and honeysuckle, which is applied in ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc., can solve problems such as polluting the environment, matching nutrient elements that do not meet the needs of honeysuckle nutrient elements, and changing soil structure. , to achieve the effect of significant economic value, significant environmental protection value and low production cost

Inactive Publication Date: 2015-01-28
GUIZHOU UNIV +2
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  • Summary
  • 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 honeysuckle special fertilizer, so as to solve the problem that the matching of nutrient elements in the existing fertilizer does not meet the demand of honeysuckle for nutrient elements, resulting in the application of honeysuckle. The rate of fertilizer absorption by honeysuckle 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 honeysuckle flower as byproduct
  • Method for preparing ammonium dihydrogen phosphate and preparing special fertilizer for honeysuckle flower as byproduct
  • Method for preparing ammonium dihydrogen phosphate and preparing special fertilizer for honeysuckle flower as byproduct

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Effect test

Embodiment 1

[0038] A method for preparing ammonium dihydrogen phosphate and by-product honeysuckle special fertilizer, comprising the steps of:

[0039] (1) Preparation of intermediate: first add phosphoric acid to the synthesis tank, then raise the temperature of phosphoric acid to 100°C, then add carbonamide to the synthesis tank to make it react with phosphoric acid, after 160 minutes of reaction, cool down the temperature After crystallization at 20°C, centrifuge to obtain the intermediate, the molar ratio of phosphoric acid to carbonamide is 1.1:1;

[0040] (2) Preparation of ammonium dihydrogen phosphate: send the intermediate obtained in step (1) into the synthesis tank, mix and react with ammonia gas at a molar ratio of 1:1.6 for 40 minutes, and control the reaction temperature by controlling the addition rate of ammonia gas at 20°C, and adjust the pH value to 8.5, and the stirring speed is 200r / min. After the reaction is completed, add the obtained slurry to the cooling crystalli...

Embodiment 2

[0045] A method for preparing ammonium dihydrogen phosphate and by-product honeysuckle special fertilizer, comprising the steps of:

[0046] (1) Preparation of intermediate: first add phosphoric acid to the synthesis tank, then raise the temperature of phosphoric acid to 150°C, then add carbonamide to the synthesis tank to make it react with phosphoric acid, after 180 minutes of reaction, cool down the temperature After crystallization at 45°C, centrifuge to obtain the intermediate, the molar ratio of phosphoric acid to carbonamide is 1.3:1;

[0047] (2) Preparation of ammonium dihydrogen phosphate: send the intermediate obtained in step (1) into the synthesis tank, mix and react with ammonia gas at a molar ratio of 1:1.9 for 60 minutes, and control the reaction temperature by controlling the addition rate of ammonia gas at 30°C, and adjust the pH value to 9.5, and the stirring speed is 200r / min. After the reaction is completed, add the obtained slurry to the cooling crystalli...

Embodiment 3

[0052] A method for preparing ammonium dihydrogen phosphate and by-product honeysuckle special fertilizer, comprising the steps of:

[0053] (1) Preparation of intermediate: first add phosphoric acid to the synthesis tank, then raise the temperature of phosphoric acid to 130°C, then add carbonamide to the synthesis tank to make it react with phosphoric acid, after 170 minutes of reaction, cool down the temperature After crystallization at 30°C, centrifuge to obtain the intermediate, the molar ratio of phosphoric acid to carbonamide is 1.2:1;

[0054] (2) Preparation of ammonium dihydrogen phosphate: send the intermediate obtained in step (1) into the synthesis tank, mix and react with ammonia gas at a molar ratio of 1:1.7 for 50 minutes, and control the reaction temperature by controlling the addition rate of ammonia gas to 30°C, and adjust the pH value to 9, and the stirring speed is 200r / min. After the reaction is completed, the obtained slurry is added to the cooling crysta...

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Abstract

The invention relates to the technical field of chemical industry, and discloses a method for preparing ammonium dihydrogen phosphate and preparing a special fertilizer for honeysuckle flower as a byproduct. The method comprises the following steps: reacting phosphoric acid with carbomite to generate an intermediate, introducing ammonia gas into the intermediate to produce ammonium dihydrogen phosphate, analyzing the proportions of all nutritional elements required by the growth of honeysuckle flower through researching the amounts of absorption of all the nutritional elements from soil by honeysuckle flower, and using an ammonium dihydrogen phosphate production waste liquid in order to prepare the special fertilizer for honeysuckle flower. 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 honeysuckle flower.

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 honeysuckle special fertilizer. 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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IPC IPC(8): C01B25/28C05G1/00C05B7/00
Inventor 陈肖虎廖吉星高贵龙石磊薛涛谢飞赵伟毅杨勇何敏金会心
Owner GUIZHOU UNIV
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