Method for producing disodium hydrogen phosphate with wet-process phosphoric acid

A technology of disodium hydrogen phosphate and wet-process phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of high production cost, and achieve the effect of reducing dosage and production cost

Inactive Publication Date: 2008-06-11
HUBEI XINGFA CHEM GRP CO LTD
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing method of using wet-process phosphoric acid to produce disodium hydrogen phosphate generally directly uses soda ash and wet-process phosphoric acid for neutralization reaction, and filters out impurity elements, and the production cost is relatively high

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] A method for producing disodium hydrogen phosphate with wet process phosphoric acid, it may further comprise the steps:

[0011] a. After mixing wet-process phosphoric acid, sodium sulfate and phosphate rock powder according to the weight ratio of 10:1.2:2, control the temperature at 80°C-85°C for 5 hours, filter, and wash the filter residue to obtain a feed liquid containing sodium dihydrogen phosphate , the filter residue is used to produce phosphate fertilizer;

[0012] b. adding soda ash to the sodium dihydrogen phosphate feed liquid obtained in a step to neutralize to a pH value of 5-6, filter to obtain a neutralized feed liquid, and the filter residue is used for phosphate fertilizer production;

[0013] c. adding soda ash to the primary neutralization feed liquid obtained in step b to adjust the pH value to 8-9, filter to obtain secondary neutralization feed liquid, and return the filter residue to reaction in step b;

[0014] d. Cool the secondary neutralizatio...

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

Provided is a process for producing disodium hydrogen phosphate with wet-process phosphoric acid, which comprises the following steps, a, wet-process phosphoric acid, sodium sulfate and rock phosphate are mixed according to the weight parts of 10: 1.2: 2, and reacted for five hours at the temperature of 80 DEG C to 85 DEG C, and filtered and washed to obtain material liquid which contains disodium hydrogen phosphate, and the leached residue is used for producing phosphate fertilizer, b, the disodium hydrogen phosphate solution obtained in step a is added with soda to be neutralized to have the pH value of 5-6, the mixture is filtered to obtain one time neutralization material liquid, and the leached residue is used for phosphate fertilizer production, c, the one time neutralization material liquid obtained in step b is added with soda to be neutralized to have the pH value of 8-9, the mixture is filtered to obtain secondary neutralization material liquid, and the leached residue is returned to step b to be reacted, d, the secondary neutralization material liquid obtained in step c is cooled to the temperature of 18 DEG C to 20 DEG C, and is crystallized and separated to obtain disodium hydrogen phosphate products and mother solution, and the mother solution is returned to step a to be reacted. The invention employs sodium sulfate to substitute for part of the soda, which reduces the amount of the soda when producing the disodium hydrogen phosphate and greatly lowers the manufacturing cost of the disodium hydrogen phosphate.

Description

technical field [0001] The invention relates to a method for producing disodium hydrogen phosphate, in particular to a method for producing disodium hydrogen phosphate with wet-process phosphoric acid. Background technique [0002] The existing method of using wet-process phosphoric acid to produce disodium hydrogen phosphate generally directly uses soda ash and wet-process phosphoric acid to carry out neutralization reaction, and filter to remove impurity elements, and the production cost is relatively high. Contents of the invention [0003] The purpose of the present invention is exactly to provide a kind of method with wet-process phosphoric acid to produce disodium hydrogen phosphate, and it uses wet-process phosphoric acid to decompose phosphate ore, and the calcium ion that precipitates with sodium sulfate produces, and sodium sulfate both does the precipitating agent of calcium ion, It can also provide some so...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C05B17/00
Inventor 邓小雄余有平谭春红
Owner HUBEI XINGFA CHEM GRP CO LTD
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