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A method for preparing special compound fertilizer for co-production of ramie with 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, complicated preparation process, high production cost, and achieve high environmental protection value and Economic value, simple preparation process, and low production equipment requirements

Inactive Publication Date: 2017-02-22
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 method for preparing special compound fertilizer for co-production of ramie with sodium dihydrogen phosphate
  • A method for preparing special compound fertilizer for co-production of ramie with sodium dihydrogen phosphate
  • A method for preparing special compound fertilizer for co-production of ramie with sodium dihydrogen phosphate

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Embodiment 1

[0036] A method for preparing sodium dihydrogen phosphate co-production special compound fertilizer for ramie, the method comprises the following steps:

[0037] a. Preparation of intermediate by reaction: mix urea and phosphoric acid with a concentration of 71% in a molar ratio of 2.3:2.5, raise the temperature to 136° C., stir and react for 2.6 hours at a stirring speed of 80 r / 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 3.7, and obtain a mother liquor containing nitrogen, phosphorus, and sodium after reacting for 100 minutes, and place the mother liquor in a cooling crystallizer to control the temperature at 17°C Cool down and crystallize, and monitor and analyze the mother liquor at the same time. When the nitrogen content is 15.1-%, phosphorus pentoxide content is 7.1-%, and sodium content is 4.1-%, stop crystallization and filter, and the obtained f...

Embodiment 2

[0041] A method for preparing sodium dihydrogen phosphate co-production special compound fertilizer for ramie, the method comprises the following steps:

[0042] a. Preparation of intermediate by reaction: mix urea and phosphoric acid with a concentration of 71% in a molar ratio of 2.3:2.6, raise the temperature to 137° C., stir and react for 2.6 hours at a stirring speed of 80 r / 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 3.7, and obtain a mother liquor containing nitrogen, phosphorus and sodium after reacting for 102 minutes, and place the mother liquor in a cooling crystallizer to control the temperature at 17°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 obtai...

Embodiment 3

[0046] A method for preparing sodium dihydrogen phosphate co-production special compound fertilizer for ramie, the method comprises the following steps:

[0047] a. Preparation of intermediate by reaction: mix urea and phosphoric acid with a concentration of 72% in a molar ratio of 2.3:2.7, raise the temperature to 138° C., stir and react for 2.6 hours at a stirring speed of 85 r / 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 3.8, and obtain a mother liquor containing nitrogen, phosphorus, and sodium after reacting for 104 minutes, and place the mother liquor in a cooling crystallizer to control the temperature at 18°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 fil...

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Abstract

The invention discloses a method for simultaneously preparing sodium dihydrogen phosphate and a special composite fertilizer for Boehmeria nivea. The method comprises the steps of preparing an intermediate through a reaction, preparing sodium dihydrogen phosphate, and preparing the special composite fertilizer for Boehmeria nivea. A filter used for preparing the special composite fertilizer for Boehmeria nivea is obtained by controlling raw materials, the temperature and the element content, the composite fertilizer prepared by using the filtrate can meet the demands of Boehmeria nivea on nutritional elements, and the method avoids the problem of soil and environment pollution caused by fertilizer residual, and has high environmentally-friendly and economic values.

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 ramie with sodium dihydrogen phosphate. Background technique [0002] Ramie is one of the important fiber crops in ancient China. Native to Southwest China. It has been planted in some places in the middle and lower reaches of the Yangtze River in the Neolithic Age. The earliest archaeological unearthed is the ramie cloth and fine hemp rope unearthed from the Neolithic site in Qianshanyang, Zhejiang, more than 4,700 years ago. Ramie is more suitable for temperate and subtropical climates, and ramie leaves are feed with high protein content and rich nutrition. Hemp root contains the medicinal ingredient of "ramie acid", which has the functions of nourishing yin, preventing miscarriage, treating prenatal and postpartum upset, and treating boils. Magu can be used as raw material for papermakin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C05G1/00
Inventor 陈肖虎廖吉星高贵龙郑培俊薛涛杨浒李军旗黄芳赵平原王丽远
Owner GUIZHOU UNIV