Production method of potassium dihydrogen phosphate

A technology of potassium dihydrogen phosphate and its production method, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc. It can solve the problems of high production cost, expensive raw materials, excessive chloride ion content, etc., so as to reduce equipment investment and reduce production Cost, the effect of improving the recovery rate

Inactive Publication Date: 2012-04-25
HUBEI SANNING CHEM
View PDF4 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Potassium dihydrogen phosphate is a high-quality phosphorus-potassium compound fertilizer. The traditional process generally uses neutralization and double decomposition. The neutralization process is simple, but the raw materials used are expensive and the production cost is high. It is difficult to use dihydrogen phosphate in agriculture and industry. Promote in the production of potassium; the metathesis method mainly uses potassium chloride and phosphoric acid to carry out the metathesis reaction, and the reaction can be carried out by removing the hydrogen chloride gas generated b

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production method of potassium dihydrogen phosphate
  • Production method of potassium dihydrogen phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take out part of the potassium bisulfate solution in the potassium bisulfate section of the high-concentration sulfur-based compound fertilizer production process (S-NPK device) and add it to the potassium dihydrogen phosphate reaction tank, and then add the potassium bisulfate solution with a molar ratio of 1 to the reaction tank. : 1 ~ 1: 1.05 powdered calcium hydrogen phosphate, react for 6 hours under the condition of full stirring, the reaction temperature is 70 ~ 85 ℃, the slurry after the reaction is filtered by a fully automatic box filter press, and the filter residue is sent to the wet After being filtered by the French phosphoric acid system filter, it is sent to the phosphogypsum storage yard or directly to the storage yard for storage. The filtrate is potassium dihydrogen phosphate solution, which is sent to the evaporation concentration device for concentration; the concentrated supersaturated solution enters the cooling crystallization tank for cooling and ...

Embodiment 2

[0021] Take out part of the potassium bisulfate solution in the potassium bisulfate section of the high-concentration sulfur-based compound fertilizer production process (S-NPK device) and add it to the potassium dihydrogen phosphate reaction tank, and then add the potassium bisulfate solution with a molar ratio of 1 to the reaction tank. : 1 ~ 1: 1.05 powdered calcium hydrogen phosphate, react for 3 hours under the condition of full stirring, the reaction temperature is 80 ~ 90 ℃, the slurry after the reaction is filtered by a fully automatic box filter press, and the filter residue is sent to the wet After being filtered by the French phosphoric acid system filter, it is sent to the phosphogypsum storage yard or directly to the storage yard for storage. The filtrate is potassium dihydrogen phosphate solution, which is sent to the evaporation concentration device for concentration; the concentrated supersaturated solution enters the cooling crystallization tank for cooling and ...

Embodiment 3

[0023] Take out part of the potassium bisulfate solution in the potassium bisulfate section of the high-concentration sulfur-based compound fertilizer production process (S-NPK device) and add it to the potassium dihydrogen phosphate reaction tank, and then add the potassium bisulfate solution with a molar ratio of 1 to the reaction tank. : 1 powdered calcium hydrogen phosphate, react for 5 hours under the condition of full stirring, the reaction temperature is 80-85°C, the slurry after the reaction is filtered by a fully automatic box-type filter press, and the filter residue is sent to the wet-process phosphoric acid system for filtration After being filtered by the machine, it is sent to the phosphogypsum storage yard or directly to the storage yard for storage. The filtrate is potassium dihydrogen phosphate solution, which is sent to the evaporation and concentration device for concentration; the concentrated supersaturated solution enters the cooling crystallization tank fo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A production method of potassium dihydrogen phosphate comprises the following steps: adding a potassium bisulfate solution and powdery calcium hydrogen phosphate into a potassium dihydrogen phosphate reaction tank for reaction, filtering the material slurry after the reaction, delivering the filter residues to a wet-method phosphoric acid system filter for filtration, delivering to a phosphogypsum stockyard or directly stacking in a stockyard, delivering the filtrate into an evaporation concentration device for concentration; allowing the concentrated supersaturated solution to enter a cooling crystallization tank, filtering the material slurry after cooling crystallization by a centrifugation filter, returning the filtered mother liquor to the potassium dihydrogen phosphate reaction tank and a mixed acid tank of a device for producing sulfur-base composite fertilizer, wherein the crystal obtained from filtration is potassium dihydrogen phosphate, drying to obtain the potassium dihydrogen phosphate finished product. The invention is applicable to all enterprises with a high-concentration sulfur-base composite fertilizer device, and has the advantages of low cost, good product quality, and less equipment investment.

Description

technical field [0001] The invention relates to the technical field of compound fertilizer production methods, in particular to a production method of potassium dihydrogen phosphate. Background technique [0002] Potassium dihydrogen phosphate is a high-quality phosphorus-potassium compound fertilizer. The traditional process generally uses neutralization and double decomposition. The neutralization process is simple, but the raw materials used are expensive and the production cost is high. It is difficult to use dihydrogen phosphate in agriculture and industry. Promotion in the production of potassium; the metathesis method mainly uses potassium chloride and phosphoric acid to carry out the metathesis reaction, and the reaction can be carried out by removing the hydrogen chloride gas generated by the reaction. This method has problems such as high energy consumption and excessive residual chloride ion content in the product. In addition, the production process of potassium ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B25/30
Inventor 李万清肖林波
Owner HUBEI SANNING CHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap