A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate

A technology for by-producing potassium dihydrogen phosphate and potassium dihydrogen phosphate, which is used in ammonium orthophosphate fertilizers, chemical instruments and methods, alkaline orthophosphate fertilizers, etc. Waste of potassium hydrogen phosphate, low purity of potassium dihydrogen phosphate products, etc., achieve significant environmental protection value and economic benefits, reduce production costs, and make up for the effects of impurity removal costs

Inactive Publication Date: 2017-01-11
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, in the process of preparing potassium dihydrogen phosphate products, the incomplete crystallization of potassium dihydrogen phosphate will cause a large amount of waste of potassium dihydrogen phosphate, and excessive crystallization of potassium dihydrogen phosphate will bring a large amount of potassium dihydrogen phosphate products. Impurities, and then make the technical problem that the purity of potassium dihydrogen phosphate product is lower

Method used

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  • A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate
  • A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate
  • A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate

Examples

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Embodiment 1

[0042] A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate. Phosphoric acid and carbamide are added to the reactor at a molar ratio of 1.1:1 and mixed, and then the temperature of the two mixtures is increased at a temperature rise rate of 5°C / min To 100℃, the reaction was stirred for 120min, then the temperature was cooled to 30℃ at a rate of 3℃ / min, and then centrifuged to obtain the urea phosphate intermediate; the intermediate and alkaline potassium salt were added to the urea phosphate at a molar ratio of 1:1.1 Mix the reaction in the reaction kettle, adjust the pH of the reaction to 8.5, and stir the reaction for 60 minutes at a stirring speed of 200r / min. After the reaction is completed, a slurry containing nitrogen, phosphorus and potassium is obtained, which is placed in a cooling crystallizer for cyclic crystallization Processing, while detecting and analyzing the filtrate, when the molar ratio of nitrogen, phosphorus, and ...

Embodiment 2

[0045] A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate. Phosphoric acid and carbamide are added to the reactor at a molar ratio of 1.3:1 and mixed, and then the temperature of the two mixtures is increased at a temperature rise rate of 5°C / min To 120℃, the reaction was stirred for 100min, then the temperature was cooled to 45℃ at a rate of 3℃ / min, and then centrifuged to obtain the urea phosphate intermediate; the intermediate and alkaline potassium salt were added to the urea phosphate at a molar ratio of 1:1.3 Mix the reaction in the reactor, adjust the pH of the reaction to 9.5, stir at 250r / min and stir the reaction for 40 minutes. After the reaction, obtain a slurry containing nitrogen, phosphorus and potassium, and place the slurry in a cooling crystallizer for cyclic crystallization treatment , Detect and analyze the filtrate at the same time. When the molar ratio of nitrogen, phosphorus and potassium in the filtrate is 4....

Embodiment 3

[0048] A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate. Phosphoric acid and carbamide are added to the reactor at a molar ratio of 1.2:1 to mix, and then the temperature of the two mixtures is increased at a temperature rise rate of 5°C / min When the temperature reaches 110°C, the reaction is stirred for 110 minutes, then the temperature is cooled to 40°C at a speed of 3°C / min, and then centrifuged to obtain the urea phosphate intermediate; the intermediate and the alkaline potassium salt are added to the urea phosphate at a molar ratio of 1:2 Mix the reaction in the reactor, adjust the pH of the reaction to 9, the stirring speed is 220r / min and stir the reaction for 50 minutes. After the reaction is over, a slurry containing nitrogen, phosphorus and potassium is obtained, which is placed in a cooling crystallizer for cyclic crystallization. Simultaneously detect and analyze the filtrate. When the molar ratio of nitrogen, phosphor...

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Abstract

The invention relates to the technical field of chemical industry, and discloses a method for preparing a special fertilizer for pears and preparing potassium dihydrogen phosphate as a byproduct. The method comprises the following steps: reacting phosphoric acid with carbomite by analyzing nutritional elements required by pears to prepare an intermediate, reacting the intermediate with an alkaline potassium salt to prepare potassium dihydrogen phosphate, controlling the content ratio of nutrients in a filtrate in the potassium dihydrogen phosphate crystallizing process, and adding trace element compounds to the potassium dihydrogen phosphate separated filtrate in order to prepare the special fertilizer for pears. The special fertilizer for pears, prepared by analyzing the ratio of the nutritional elements required in the growth process of pears, improves the output of pears, and the prepared potassium dihydrogen phosphate has high purity and has a relatively low cost.

Description

Technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a method for preparing a special fertilizer for pears and by-product potassium dihydrogen phosphate. Background technique [0002] Pear is the name of a fruit, deciduous tree. One of the birthplaces of my country's Pear genus. Most Asian pears originated in eastern Asia. Japan and North Korea are also the original producing areas of Asian pears; domestically cultivated white pears (sweet pears), sand pears, and autumn pears are all native In our country. Pear has the effect of clearing the lungs and nourishing the lungs. People who eat more pears have a much lower chance of catching a cold than those who don't eat or eat less pears, so some scientists and physicians call pears a "all-round healthy fruit" or "general practitioner". Due to the serious air pollution, pears can improve the respiratory system and lung function, have the effect of moisturizing the lungs, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30C05G1/00C05B7/00
Inventor 陈肖虎廖吉星高贵龙谢飞薛涛杨勇唐晓宁石磊曾舒李军旗
Owner GUIZHOU UNIV
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