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Method for removing pungent smell with electronic-grade phosphoric acid

An electronic-grade phosphoric acid and irritating odor technology, applied in the field of phosphorus chemical industry, can solve problems such as product quality fluctuations, and achieve the effects of stabilizing product quality, slowing down the decomposition rate, and removing irritating odors

Active Publication Date: 2018-07-13
湖北兴福电子材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The above methods all use physical means to blow off the dissolved hydrogen sulfide gas in ordinary phosphoric acid. Ordinary phosphoric acid has a wide specification limit for impurities, but for electronic grade phosphoric acid, this method is very easy to introduce trace impurities, causing fluctuations in product quality.

Method used

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  • Method for removing pungent smell with electronic-grade phosphoric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The filtered electronic-grade phosphoric acid enters the degassing tower, accounting for about 1 / 2 of the volume of the degassing tower. Keep the temperature of phosphoric acid in the degassing tower at 70°C, and continuously feed high-purity nitrogen (purity 99.99%) into the degassing tower for 3 hours. Gas volume is controlled at 300~700m 3 / h, and then continuously input 400mL of deodorant with the formula of 35% (mass fraction) hydrogen peroxide, 8% inorganic acid and 57% water from the inlet of the circulating acid pump. In contrast, there is no odor, and the concentration of easy oxides is less than or equal to 2ppm, and the concentration of sulfate ions is less than or equal to 2ppm. The gas from the top of the degassing tower is sent to the tail gas system.

Embodiment 2

[0041] The filtered electronic-grade phosphoric acid enters the degassing tower, accounting for about 3 / 5 of the volume of the degassing tower. Keep the temperature of phosphoric acid in the degassing tower at 70°C, and continuously feed high-purity nitrogen (purity 99.99%) into the degassing tower for 4 hours. Gas volume is controlled at 300~700m 3 / h, and then continuously put 650mL of deodorant with the formula of 55% (mass fraction) hydrogen peroxide, 15% inorganic acid, and 30% water from the inlet of the circulating acid pump, and ventilate for 2 hours to obtain electronic-grade phosphoric acid and pure water In contrast, there is no odor, and the concentration of easy oxides is less than or equal to 2ppm, and the concentration of sulfate ions is less than or equal to 2ppm. The gas from the top of the degassing tower is sent to the tail gas system.

Embodiment 3

[0043] The filtered electronic-grade phosphoric acid enters the degassing tower, accounting for about 2 / 3 of the volume of the degassing tower. Keep the temperature of phosphoric acid in the degassing tower at 70°C, and continuously feed high-purity nitrogen (purity 99.99%) into the degassing tower for 5.5 hours , the gas volume is controlled at 300-700m 3 / h, and then continuously input 730mL deodorant with the formula of 40% (mass fraction) hydrogen peroxide, 25% inorganic acid, and 35% water from the inlet of the circulating acid pump. In contrast, there is no odor, and the concentration of easy oxides is less than or equal to 2ppm, and the concentration of sulfate ions is less than or equal to 2ppm. The gas from the top of the degassing tower is sent to the tail gas system.

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Abstract

The invention discloses a method for removing pungent smell in electronic-grade phosphoric acid production. After hydrogen sulfide gas of the filtered electronic-grade phosphoric acid is blown off with high-purity nitrogen, a deodorant is added, and then the high-purity nitrogen is continuously fed, and residual hydrogen sulfide and phosphorus trioxide are cyclically oxidized, so that the pungentsmell-free electronic-grade phosphoric acid of which readily oxidizable substances and sulfate ions have concentrations less than 2 ppm is obtained. The problems that the conventional method is incomplete in pungent smell removal and wastes time and energy, equipment is complicated in structure, and the specification of the electronic-grade phosphoric acid fluctuates after the gas is removed are solved; the quality of a high-purity phosphoric acid product is improved; the gas treatment time is shortened; the production efficiency is improved; and the production period is shortened.

Description

technical field [0001] The invention relates to the technical field of phosphorus chemical industry, in particular to a method for removing irritating odor with electronic-grade phosphoric acid. Background technique [0002] Phosphorus is an important element of life, and high-purity phosphoric acid food additive is widely used in the food industry as a sour agent and a nutrient for yeast. With the rapid development of my country's electronics industry, electronic grade phosphoric acid has also been widely used in the electronics industry. The impurity index requirements for electronic grade phosphoric acid are particularly strict. Currently, electronic [0003] Phosphoric acid is mainly produced through dearsenization and filtration of industrial phosphoric acid. The hydrogen sulfide precipitation method is used for the dearsenization of electronic-grade phosphoric acid, that is, the de-arsenic reaction is carried out by adding hydrogen sulfide gas to industrial phosphor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/237
CPCC01B25/237
Inventor 杜林汪鹏郭岚峰姜飞陈辉刚徐昊段昌圣杨着
Owner 湖北兴福电子材料股份有限公司
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