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A method for removing irritating odor with electronic grade phosphoric acid

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

Active Publication Date: 2021-12-03
HUBEI SINOPHORUS ELECTRONIC MATERIALS CO LTD
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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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  • A method for removing irritating odor with electronic grade phosphoric acid

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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 continue to put 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, and ventilate for 1 hour 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 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, 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 ≤2ppm, and the concentration of sulfate ions is ≤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 put 730mL of deodorant with the formula of 40% (mass fraction) hydrogen peroxide, 25% inorganic acid and 35% 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 ≤2ppm, and the concentration of sulfate ions is ≤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 the irritating smell in the production of electronic grade phosphoric acid. After the filtered electronic grade phosphoric acid is blown off by high-purity nitrogen to remove hydrogen sulfide gas, a deodorant is added, and high-purity nitrogen is continuously introduced. , Cyclic oxidation of residual hydrogen sulfide and phosphorus trioxide, to obtain electronic-grade phosphoric acid with no pungent odor, and the concentration of easy oxides and sulfate ions is less than 2ppm. It solves the problem of incomplete removal of irritating odor, time-consuming, energy-consuming, complex equipment structure, and fluctuation of electronic-grade phosphoric acid specifications after gas removal, improves the quality of high-purity phosphoric acid products, shortens gas processing time, improves production efficiency, and shortens Production cycle.

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 Patents(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 HUBEI SINOPHORUS ELECTRONIC MATERIALS CO LTD
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