Method for producing sodium tripolyphosphate by utilization of crude sodium pyrophosphate

A technology of sodium tripolyphosphate and crude sodium pyrophosphate, which is applied in the refining process field of crude sodium pyrophosphate, to realize the recovery of side waste resources, high crystal purity, and improve the effect of refining process

Active Publication Date: 2017-01-18
YIBIN TIANYUAN GRP CO LTD +1
View PDF3 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of needing special equipment in the existing method of utilizing crude sodium pyrophosphate to prod

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
  • Method for producing sodium tripolyphosphate by utilization of crude sodium pyrophosphate
  • Method for producing sodium tripolyphosphate by utilization of crude sodium pyrophosphate
  • Method for producing sodium tripolyphosphate by utilization of crude sodium pyrophosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, the crude sodium pyrophosphate first enters the salt washing tank to remove most of the sodium chloride through salt washing, and then enters the plate and frame filter press for a pressure filtration. The filter cake contains a large amount of sodium pyrophosphate, and the mass concentration of sodium chloride is less than 2.5%, then heat the solution to 85°C with steam in the dissolution tank for stirring and dissolving, add sodium sulfide to remove metal ions during dissolution, the insoluble matter is copper hydroxide and other impurities, and then carry out secondary pressure filtration, the filtrate is sodium pyrophosphate solution, add activated carbon to the filtrate to remove pigment, add phosphoric acid to acidify, accelerate dissolution, and finally add liquid caustic soda to adjust the pH value to 7.5-8.5 to prepare a refin...

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

The invention relates to a utilization method of crude sodium pyrophosphate and specifically discloses a method for producing sodium tripolyphosphate by the utilization of crude sodium pyrophosphate. The method of the invention comprises the following steps: (1) washing crude sodium pyrophosphate; (2) filter-pressing washed slag; (3) dissolving filter cake, adding an impurity remover into the solution to remove metal ion; (4) press-filtering the deimpurity solution; (5) adding a decolorising agent to remove pigment, acidifying by adding phosphoric acid, accelerating dissolution, and finally adjusting pH value by adding alkali lye; (6) cooling for crystallization, and carrying out solid-liquid separation to obtain sodium pyrophosphate crystal; and (7) using the sodium pyrophosphate crystal as a production raw material for production of sodium tripolyphosphate. The invention has the following advantages: 1) recovery of waste resources is realized; 2) implementation is simple, and production efficiency is high; 3) purity of the sodium pyrophosphate crystal is high; and 4) production cost of sodium tripolyphosphate is reduced.

Description

technical field [0001] The invention relates to a refining process of crude sodium pyrophosphate, in particular to a method for utilizing crude sodium pyrophosphate. Background technique [0002] At present, most of the preparation methods of sodium tripolyphosphate are to make sodium tripolyphosphate directly with neutralizing solution, wherein the neutralizing solution is prepared by phosphoric acid and liquid caustic soda, and it is added to the neutralizing solution preparation tank in proportion or by metering during production. Phosphoric acid and caustic soda, and then follow-up process to make sodium tripolyphosphate. This process is a mature traditional process that has been used for many years. However, with the changes in the market, the prices of caustic soda and phosphoric acid have continued to rise in recent years, resulting in rising costs of sodium tripolyphosphate. The profit margin is getting smaller and smaller, and it is on the verge of loss. [0003] C...

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): C01B25/41
CPCC01B25/41
Inventor 谢彬王建湘秦滔唐兆黄伟罗传元
Owner YIBIN TIANYUAN 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