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A kind of method for preparing loquat special-purpose compound fertilizer co-production of sodium dihydrogen phosphate

A technology of sodium dihydrogen phosphate and compound fertilizer, applied in phosphorus compounds, chemical instruments and methods, applications, etc., can solve the problems of unstable sodium dihydrogen phosphate product, complex preparation process, high equipment requirements, and achieve high environmental protection value and Economic value, simple preparation process, and low production equipment requirements

Inactive Publication Date: 2016-08-31
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent document that publication number is CN101475463A discloses a kind of method that calcium formate and superphosphoric acid react and co-produce high-purity formic acid and sodium dihydrogen phosphate, this method adopts carbon monoxide to enter reaction three towers, potassium hydroxide enters reaction one tower, and comes from The carbon monoxide in the second reaction tower reacts countercurrently, the reaction liquid overflows to the second reaction tower, and reacts countercurrently with the carbon monoxide gas from the third reaction tower. The feed tank is used to prepare a calcium formate preparation solution. The calcium formate preparation solution enters the reactor, drips formic acid, feeds hydrogen sulfide, and separates the filter residue through the filter I. The filtrate enters the continuous crystallizer, and the crystallization solution enters the filter II. The calcium formate is made into finished calcium formate through the dryer, superphosphoric acid, formic acid and calcium formate are input into the horizontal twin-screw reactor to generate formic acid and calcium dihydrogen phosphate, which enter the formic acid distillation tank for vacuum distillation, and the calcium dihydrogen phosphate is transported to Calcium dihydrogen phosphate metering receiving tank, formic acid enters the formic acid receiving tank, although the formic acid prepared by this method has high purity, but due to the complicated preparation process, high equipment requirements, and the unstable sodium dihydrogen phosphate product, the production cost is too high

Method used

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  • A kind of method for preparing loquat special-purpose compound fertilizer co-production of sodium dihydrogen phosphate
  • A kind of method for preparing loquat special-purpose compound fertilizer co-production of sodium dihydrogen phosphate
  • A kind of method for preparing loquat special-purpose compound fertilizer co-production of sodium dihydrogen phosphate

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Embodiment 1

[0036] A method for preparing a special compound fertilizer for loquat co-production of sodium dihydrogen phosphate, the method comprising the following steps:

[0037] a. Preparation of intermediate by reaction: Mix urea and phosphoric acid with a concentration of 65% in a molar ratio of 2:2.4, raise the temperature to 111°C, stir and react for 2.2 hours at a stirring speed of 70r / min, and separate to obtain the intermediate;

[0038]b. Preparation of sodium dihydrogen phosphate: mix the intermediate with sodium hydroxide, control the pH value to 3.2, and obtain a mother liquor containing nitrogen, phosphorus, and sodium after reacting for 80 minutes, and place the mother liquor in a cooling crystallizer to control the temperature at 19°C Cool down and crystallize, and monitor and analyze the mother liquor at the same time. When the nitrogen content is 15.2%, the phosphorus pentoxide content is 7.2%, and the sodium content is 4.2%, stop crystallization and filter, and the obta...

Embodiment 2

[0041] A method for preparing a special compound fertilizer for loquat co-production of sodium dihydrogen phosphate, the method comprising the following steps:

[0042] a. Preparation of intermediate by reaction: Mix urea and phosphoric acid with a concentration of 66% in a molar ratio of 2:2.5, raise the temperature to 112°C, stir and react for 2.2 hours at a stirring speed of 71r / min, and separate to obtain the intermediate;

[0043] b. Preparation of sodium dihydrogen phosphate: mix the intermediate with sodium hydroxide, control the pH value to 3.3, and obtain a mother liquor containing nitrogen, phosphorus, and sodium after reacting for 82 minutes, and place the mother liquor in a cooling crystallizer to control the temperature at 20°C Cool down and crystallize, and monitor and analyze the mother liquor at the same time. When the nitrogen content is 15.3%, phosphorus pentoxide content is 7.3%, and sodium content is 4.3%, stop crystallization and filter, and the obtained fi...

Embodiment 3

[0046] A method for preparing a special compound fertilizer for loquat co-production of sodium dihydrogen phosphate, the method comprising the following steps:

[0047] a. Preparation of intermediate by reaction: Mix urea and phosphoric acid with a concentration of 67% in a molar ratio of 2:2.6, raise the temperature to 113°C, stir and react for 2.2 hours at a stirring speed of 73r / min, and separate to obtain the intermediate;

[0048] b. Preparation of sodium dihydrogen phosphate: mix the intermediate with sodium hydroxide, control the pH value to 3.4, and obtain a mother liquor containing nitrogen, phosphorus, and sodium after reacting for 84 minutes, and place the mother liquor in a cooling crystallizer to control the temperature at 21°C Cool down and crystallize, and monitor and analyze the mother liquor at the same time. When the nitrogen content is 15.4%, phosphorus pentoxide content is 7.4%, and sodium content is 4.4%, stop crystallization and filter, and the obtained fi...

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Abstract

The invention discloses a method for preparation of sodium dihydrogen phosphate and coproduction of a special compound fertilizer for loquat. The method comprises three steps as follows: preparation of an intermediate by a reaction, preparation of sodium dihydrogen phosphate and preparation of the special compound fertilizer for loquat. By controlling raw materials, temperature and element content, a filtrate which can be used to prepare the special compound fertilizer for loquat is obtained. By the use of the compound fertilizer prepared from the filtrate, requirements of loquat on nutrient elements can be met, and the soil environmental-pollution problem caused by the fertilizer residue is avoided. The method has high value of environmental protection as well as economic value.

Description

technical field [0001] The invention relates to the technical field of chemical fertilizers, in particular to a method for preparing a special compound fertilizer for co-production of loquat with sodium dihydrogen phosphate. Background technique [0002] Loquat is also known as Luju, Luzhi, Jinwan, Yanguo, Jiaozi, Rosaceae, and Loquat. Loquat is native to southeastern my country. It is named for its leaves shaped like a lute. Its flowers can be used as medicine. The height of the tree is 3-5 meters, the leaves are large and long, thick and hairy, oblong, and shaped like a lute. Unlike most fruit trees, loquat blooms in autumn or early winter, and its fruit matures in spring to early summer, earlier than other fruits. Therefore, it is called "the one with the unique spirit of the four seasons among fruit trees". The flower of loquat is white or light yellow, has five petals, about 2 centimeters in diameter, forms a bunch with five to ten, can be used as nectar crop. Loquat ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30C05G1/00
Inventor 陈肖虎廖吉星高贵龙陈勇薛涛陈双龙何敏杨浒王丽远黄芳
Owner GUIZHOU UNIV