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

An electronic grade phosphoric acid, stirring crystallization technology, applied in phosphoric acid, phosphorus oxyacid, chemical instruments and methods, etc., can solve the problems of extremely high purity requirements, not easy to industrialize, long operation time, etc., to ensure high purity, separation The effect of thorough and improved production efficiency

Active Publication Date: 2016-01-27
GUANGXI MINGLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

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Embodiment 1

[0032]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 an...

Embodiment 2

[0043] 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...

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Abstract

The invention discloses a method for producing electronic-grade phosphoric acid by stirring and crystallizing. The method comprises the production processes of yellow phosphorous rinsing, air purification, combustion, hydration, absorption and purification and is characterized in that ultrapure water is used for purifying the yellow phosphorous and the phosphoric acid, combustion air is purified, the phosphoric acid is subjected to preliminary purification and impurity removal by adopting a chemical precipitation method, and then the phosphoric acid is deeply purified by adopting a crystallization method, thus the electronic-grade phosphoric acid is obtained. The method has the advantages that the high purity of an electronic acid raw material is effectively ensured, the waterhead safety conveying is realized, the yellow phosphorous combustion effect is good, stirring and crystallization are carried out in a reaction kettle, the heat exchange efficiency of the phosphoric acid and a cooling medium is improved, the purification effect of crystallization is improved, the crystallization speed is accelerated, the speed of crystallization and melting is also accelerated, the production cycle of the electronic-grade phosphoric acid is substantially shortened, the production efficiency is greatly improved, the waste heat of yellow phosphorous combustion is effectively utilized, the production energy consumption of the electronic-grade phosphoric acid is reduced, and the electronic-grade phosphoric acid has relatively 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 stirring and crystallizing. 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 requirem...

Claims

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Application Information

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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