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A kind of preparation method of special fertilizer for cockscomb

A technology for special fertilizer and cockscomb, which is applied in the directions of phosphate fertilizer, application, fertilization device, etc., can solve the problems of low absorption rate of cockscomb, low output of cockscomb, waste of ammonium dihydrogen phosphate, etc., and achieves significant environmental protection value and significant economic value. , the effect of low production cost

Inactive Publication Date: 2017-07-28
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 preparation method of special fertilizer for cockscomb, to solve the problem that the combination of nutrient elements in the existing fertilizer does not meet the needs of cockscomb for nutrient elements, resulting in the fertilizer applied to cockscomb being The absorption rate of celosia is low, and the growth of celosia is not good
Simultaneously, solve in the process of preparing ammonium dihydrogen phosphate product, incomplete crystallization of ammonium dihydrogen phosphate will lead to lower cockscomb yield, resulting in a large amount of waste of ammonium dihydrogen phosphate, excessive crystallization of ammonium dihydrogen phosphate will give The ammonium dihydrogen phosphate product brings a large amount of impurities, which in turn makes the technical problem of lower purity of the ammonium dihydrogen phosphate product

Method used

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  • A kind of preparation method of special fertilizer for cockscomb
  • A kind of preparation method of special fertilizer for cockscomb
  • A kind of preparation method of special fertilizer for cockscomb

Examples

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Embodiment 1

[0039] A method for preparing special fertilizer for celosia, comprising the following steps:

[0040] (1) Preparation of intermediate: first add phosphoric acid to the reaction kettle, and raise the temperature of phosphoric acid to 100°C, then add carbonamide to the reaction kettle to make it react with phosphoric acid, after 210 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 1.3:1;

[0041] (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 1.2:1, 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 fi...

Embodiment 2

[0046] A method for preparing special fertilizer for celosia, comprising the following steps:

[0047] (1) Preparation of intermediates: 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, after 190 minutes of reaction, cool down the temperature Crystallize after reaching 25°C, and then centrifuge to obtain the intermediate, the molar ratio of phosphoric acid to carbonamide is 1.4:1;

[0048] (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 50min, the reaction temperature is 30°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, a...

Embodiment 3

[0053] 1. Preparation of intermediate: first add phosphoric acid into the reaction kettle, raise the temperature of phosphoric acid to 115°C, then add carbonamide to the reaction kettle to make it react with phosphoric acid, after 190 minutes of reaction, cool the temperature to After crystallization at 20°C, the intermediate was obtained by centrifugation, and the molar ratio of phosphoric acid to carbonamide was 1.4:1;

[0054] 2. Prepare ammonium dihydrogen phosphate: send the intermediate obtained in step (1) into the reactor, and feed ammonia gas into the reactor. The mol ratio of ammonia to the intermediate is 1.3:1, and the reaction time is controlled 60min, the reaction temperature is 25°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 mass ratio of nitrogen and phosphorus in the filtrate is 11 ...

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Abstract

The invention discloses a method for preparing a special fertilizer for cockscomb. The method is to generate an intermediate by reacting phosphoric acid and carbonamide, and then inject ammonia gas into the intermediate to produce ammonium dihydrogen phosphate, so that a part of the dihydrogen phosphate Ammonium crystallization is used to adjust the ratio of nutrient elements in the reaction solution to meet the growth requirements of cockscomb, and add other nutrient elements required by cockscomb to prepare special fertilizer for cockscomb. This production method makes full use of raw materials, and no waste liquid is discharged to pollute the environment. By strictly controlling the amount of various parameters in the production process, the quality of the produced ammonium dihydrogen phosphate is better, and the cost of the prepared special fertilizer for cockscomb is lower. .

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing a special fertilizer for cockscomb. 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 multi-element compound fertilizer contain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28C05G1/00C05B7/00
Inventor 陈肖虎廖吉星高贵龙张文吴俊良薛涛喻茂古文全黄芳王丽远
Owner GUIZHOU UNIV
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