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A method for producing electronic-grade phosphoric acid by U-tube crystallization

An electronic-grade phosphoric acid and U-shaped tube technology, which is applied in phosphoric acid, phosphorus oxyacids, chemical instruments and methods, etc., can solve the problems of extremely high purity requirements, high concentration, and high production costs, and achieve the effect of ensuring high purity

Active Publication Date: 2016-01-20
GUANGXI MINGLI CHEM
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  • 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

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

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Embodiment 1

[0030] A method for producing electronic grade phosphoric acid through U-tube crystallization. Yellow phosphorus is fed into a rinsing tank containing 20% ​​dilute phosphoric acid, the rinsing tank is jacketed with hot water, the circulating rinsing pump is turned on for 10 minutes, and the yellow is rinsed repeatedly. Phosphorus, the water-soluble impurities are removed by hot water flotation, and the circulating pump is turned on for repeated rinsing; the air washing tower is turned on, and the air is washed by the phosphoric acid in the washing tower to remove dust and dehumidify and enter the yellow phosphorus combustion furnace.

[0031] The rinsed liquid phosphorus is continuously supplied with liquid yellow phosphorus at the bottom of the combustion tower under the condition of a certain water level difference in the phosphorus metering tank. The clean air is regulated and supplied by one or more air inlets in the lower section of the tower, and the liquid yellow phosphorus ...

Embodiment 2

[0041] A method for producing electronic grade phosphoric acid by U-shaped tube crystallization. Yellow phosphorus is fed into a rinsing tank containing 30% dilute phosphoric acid, the rinsing tank is jacketed with hot water, and the circulating rinsing pump is turned on for 20 minutes to rinse the yellow repeatedly. Phosphorus, the water-soluble impurities are removed by hot water flotation, and the circulating pump is turned on for repeated rinsing; the air washing tower is turned on, and the air is washed by the phosphoric acid in the washing tower to remove dust and dehumidify and enter the yellow phosphorus combustion furnace.

[0042] The rinsed liquid phosphorus is continuously supplied with liquid yellow phosphorus at the bottom of the combustion tower under the condition of a certain water level difference in the phosphorus metering tank. The clean air is regulated and supplied by one or more air inlets in the lower section of the tower, and the liquid yellow phosphorus an...

Embodiment 3

[0051] A method for producing electronic grade phosphoric acid through U-tube crystallization. Yellow phosphorus is fed into a rinsing tank containing 70% dilute phosphoric acid, the rinsing tank is jacketed with hot water, and the circulating rinsing pump is turned on for 30 minutes, and the yellow is rinsed repeatedly Phosphorus, the water-soluble impurities are removed by hot water flotation, and the circulating pump is turned on for repeated rinsing; the air washing tower is turned on, and the air is washed by the phosphoric acid in the washing tower to remove dust and dehumidify and enter the yellow phosphorus combustion furnace.

[0052] The rinsed liquid phosphorus is continuously supplied with liquid yellow phosphorus at the bottom of the combustion tower under the condition of a certain water level difference in the phosphorus metering tank. The clean air is regulated and supplied by one or more air inlets in the lower section of the tower, and the liquid yellow phosphorus...

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Abstract

The invention discloses a method for producing electronic grade phosphoric acid by U tube crystallization. The method comprises work procedures of yellow phosphorus rinsing, air purification, combustion, hydration absorbing and purification, wherein dilute phosphoric acid is used for purifying yellow phosphorus and phosphoric acid is used for purifying combustion air, the phosphoric acid is treated with primary purification and impurity removal by a chemical precipitation method, and then, the phosphoric acid is deeply purified by a crystallization method to form the electronic grade phosphoric acid. By the method, high purity of electronic grade acid is guaranteed effectively, the electronic grade acid is transmitted safely by virtue of water head, yellow phosphorus combusts well, crystallization occurs in the crystallization U tube, heat exchange speed of phosphoric acid and cooling medium is improved, purification effect of crystal is improved, crystallization is accelerated, crystal fusion is also accelerated, production cycle of the electronic grade phosphoric acid is shortened greatly, production efficiency is increased greatly, combustion afterheat of yellow phosphorus is used effectively, and energy consumption of production of electronic grade phosphoric acid is lowered, so that the method has better economic benefits and social benefits.

Description

Technical field [0001] The invention relates to the technical field of phosphoric acid production in the phosphorous chemical industry, and relates to a method for producing electronic grade phosphoric acid by crystallization of a U-shaped tube. Background technique [0002] Electronic grade phosphoric acid is a high-purity phosphoric acid. It 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 chip cleaning and etching. Its purity and cleanliness affect the yield of electronic components. , Conductivity and reliability have a great impact. The lower purity is mainly used for the cleaning of liquid crystal panel components, and the higher purity is mainly used for the cleaning and etching of the electronic wafer production process. Because insoluble solid particles or metal ions may be Electric current is conducted between tiny circuits to make them short-circuit, so electroni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/20C01B25/234
Inventor 林军吴小海苏杰文王文营
Owner GUANGXI MINGLI CHEM