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Method for preparing ammonium dihydrogen phosphate and co-producing enhancement fertilizer special for onions

A technology of ammonium dihydrogen phosphate and enhanced fertilizer, applied in the direction of phosphate, phosphorus oxyacid, application, etc., can solve the problems of polluted environment, low absorption rate of onion, changing soil structure, etc., and achieve significant economic value and significant environmental protection value , the effect of less fertilizer input

Inactive Publication Date: 2015-01-21
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 co-producing onion-specific enhanced fertilizer, so as to solve the problem that the matching of nutrient elements in the existing fertilizer does not meet the requirements of onion for nutrient elements, resulting in the need for onions. Applied fertilizers are less absorbed by onions, 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 co-producing enhancement fertilizer special for onions
  • Method for preparing ammonium dihydrogen phosphate and co-producing enhancement fertilizer special for onions
  • Method for preparing ammonium dihydrogen phosphate and co-producing enhancement fertilizer special for onions

Examples

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Embodiment 1

[0038] A method for preparing ammonium dihydrogen phosphate and co-producing a special enhanced fertilizer for onions, comprising the following steps:

[0039] (1) Preparation of intermediate: first add phosphoric acid to the reaction kettle, and raise the temperature of phosphoric acid to 120°C, then add carbonamide to the reaction kettle to make it react with phosphoric acid, after 240 minutes of reaction, cool down the temperature Crystallize after reaching 15°C, and then centrifuge to obtain the intermediate, the molar ratio of phosphoric acid to carbonamide is 1.1:1;

[0040] (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 40min, the reaction temperature is 25°C, and the pH value is adjusted to 8. After the reaction is completed, the obtained slurry is added to the co...

Embodiment 2

[0045] A method for preparing ammonium dihydrogen phosphate and co-producing a special enhanced fertilizer for onions, comprising the following steps:

[0046] (1) Preparation of intermediate: first add phosphoric acid into the reaction kettle, and raise the temperature of phosphoric acid to 140°C, then add carbonamide into the reaction kettle to make it react with phosphoric acid, after 200 minutes of reaction, cool down the temperature crystallize after reaching 30°C, and then centrifuge to obtain the intermediate, the molar ratio of phosphoric acid to carbonamide is 1.3:1;

[0047] (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 1.6:1, and the reaction is controlled The time is 60min, the reaction temperature is 15°C, and the pH value is adjusted to 9. After the reaction is completed, the obtained slurry is added t...

Embodiment 3

[0052] (1) Preparation of intermediate: first add phosphoric acid to the reaction kettle, and raise the temperature of phosphoric acid to 130°C, then add carbonamide to the reaction kettle to make it react with phosphoric acid, react for 220min, then cool down the temperature crystallize after reaching 20°C, and then centrifuge to obtain the intermediate, the molar ratio of phosphoric acid to carbonamide is 1.2:1;

[0053] (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 50min, the reaction temperature is 20°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 circulate crystallization, and the filtrate is detected and analyzed at the same time. When the nitrogen and phosphorus pentoxide in the filtr...

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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 co-producing an enhancement fertilizer special for onions. The method comprises the following steps: analyzing the proportion of nutritive elements required in a growth process of the onions by detecting the quantities of various nutritive elements absorbed from soil in the growth process of the onions, then reacting phosphoric acid with carbamide to generate an intermediate, then introducing ammonia gas into the intermediate to produce ammonium dihydrogen phosphate, separating part of ammonium dihydrogen phosphate by crystallization for adjusting the proportion of the nutritive elements in a reaction liquid to meet the requirements of the growth of the onions, and adding other nutritive elements required by the onions to prepare the enhancement fertilizer special for the onions. According to the production method disclosed by the invention, raw materials can be fully used, produced ammonium dihydrogen phosphate is relatively good in quality, and the prepared enhancement fertilizer special for the onions is relatively low in cost.

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 co-producing special enhanced fertilizer for onions. 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 ...

Claims

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Application Information

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IPC IPC(8): C01B25/28C05G1/06
Inventor 陈肖虎廖吉星高贵龙朱飞武薛涛彭宝林何敏石秀明李军旗唐晓宁
Owner GUIZHOU UNIV
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