Supercharge Your Innovation With Domain-Expert AI Agents!

A method for producing electronic-grade phosphoric acid by separator crystallization

An electronic-grade phosphoric acid and crystallization technology, which is applied in the direction of phosphoric acid, phosphorus oxyacids, chemical instruments and methods, etc., can solve the problems of high production cost, low operating temperature, and long operating time, so as to increase the unit crystallization area and reduce production Energy consumption, effect of improving crystallization efficiency

Active Publication Date: 2015-09-16
GUANGXI MINGLI CHEM
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method operates at extremely low temperature, consumes a lot of energy, and requires pretreatment of raw materials to remove arsenic. The operation time is long, the production cost is high, and the yield is low.
[0006] Chinese patent 201010100473.0 uses flow chromatography crystallization method to prepare high-purity phosphoric acid, and adopts external sound field to crystallize, which requires extremely high purity of raw materials (the concentration of main impurity ions is less than 1.7mg / L, and requires microporous membrane filtration), so it is difficult to apply Larger, not easy to industrialize
However, the concentration of Na, Al, Mg, Cr and other ions in the electronic grade phosphoric acid prepared by this method is relatively high (1.79mg / L, 0.94mg / L, 0.49mg / L, 0.37mg / L), which cannot meet the needs of users who are increasingly updating still needs to be further improved

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
  • A method for producing electronic-grade phosphoric acid by separator crystallization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Put the yellow phosphorus into the yellow phosphorus rinsing tank pre-installed with 65 ℃ ultra-pure water. The jacket of the rinsing tank is heated with hot water, and the circulating rinsing pump is turned on to rinse the yellow phosphorus repeatedly. The impurities soluble in water are removed by hot water flotation. Phosphorus flows into the phosphorus metering tank from the constant phosphorus level device, which keeps the liquid phosphorus at a certain phosphorus level in the metering tank, and supplies phosphorus to the combustion tower with water level difference and valve control. The yellow phosphorus pipeline is insulated with a hot water jacket to keep the liquid phosphorus in a fluid state. The heat preservation hot water comes from the jacket of the combustion tower. Under the action of the hot water level difference, it flows into the jacket of the phosphorus melting tank and the phosphorus metering tank, and then enters the condensate pool. Hot water requi...

Embodiment 2

[0045] Rinse the outer wall of the barrel containing yellow phosphorus with water, hoist it into the phosphorus melting tank by a crane, and add an appropriate amount of pure water, heat the jacket of the phosphorus melting tank with hot water, and the temperature in the tank reaches 65°C to melt the yellow phosphorus. The impurities dissolved in water are removed by hot water flotation, and the liquid phosphorus flows into the phosphorus metering tank from the constant phosphorus level device. phosphorus. The yellow phosphorus pipeline is insulated with a hot water jacket to keep the liquid phosphorus in a fluid state. The heat preservation hot water comes from the jacket of the combustion tower. Under the action of the hot water level difference, it flows into the jacket of the phosphorus dissolving tank and the phosphorus metering tank. After coming out, it enters the condensate pool. The hot water needed for constant phosphorus dissolution temperature in phosphorus tank a...

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 discloses a method for producing electronic-grade phosphoric acid through baffle crystallization. The method comprises production processes of yellow phosphorus rising, air purification, combustion, hydration absorption and purification. The method is characterized in that yellow phosphorus is purified with ultrapure water, combustion air is purified with phosphoric acid, the yellow phosphorus is gasified in a rectangular tube and is burned, the phosphoric acid is subjected to preliminary purification impurity removal by adopting a chemical precipitation method, and then a baffle crystallizer is used for crystallization so as to carry out deep purification on the phosphoric acid, thus the electronic-grade phosphoric acid is obtained. The method has the advantages that the high purity of electronic acid raw materials is effectively ensured, the water level difference safety conveying is realized, the yellow phosphorus combustion effect is good, the baffle crystallizer is used for crystallization, the unit crystallization area is enlarged, and the crystallization efficiency is improved; and the burning waste heat of the yellow phosphorus is effectively utilized, the production energy consumption of the electronic-grade phosphoric acid is reduced, and the method has good economic benefits and social benefits.

Description

Technical field: [0001] The invention relates to the technical field of phosphoric acid production in the phosphorus chemical industry, and relates to a method for producing electronic-grade phosphoric acid by crystallization of a separator. Background technique: [0002] Electronic-grade phosphoric acid belongs to high-purity phosphoric acid, which is widely used in microelectronics industries such as large-scale integrated circuits and thin-film liquid crystal displays (TFT-LCD). It is mainly used for cleaning and etching chips. , Conductivity and reliability have a great influence. The ones with lower purity are mainly used for cleaning liquid crystal panel components, and the ones with higher purity are mainly used for cleaning and etching in the production process of electronic chips. Since insoluble solid particles or metal ions may be in the The current is conducted between the tiny circuits to make it short circuit, so electronic grade phosphoric acid has strict requ...

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 Patents(China)
IPC IPC(8): C01B25/20C01B25/234
CPCY02P20/129
Inventor 林军吴小海苏杰文王文营
Owner GUANGXI MINGLI CHEM
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com