Preparation method of high-purity hydrogen chloride

A technology of hydrogen chloride and high-purity chlorine gas, which is applied in the direction of hydrogen chloride preparation, chlorine/hydrogen chloride, chlorine/hydrogen chloride purification, etc., can solve the problems that cannot meet the use requirements of electronic grade chlorine gas, and achieve excellent adsorption of chlorine gas impurities, not easy to decompose and break, gas The effect of reducing the content of impurities

Active Publication Date: 2020-01-17
ZHEJIANG BRITECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The high-purity hydrogen chloride in the prior art has undergone multi-stage rectification, and the content of water and gas impurities is still above 100ppb, which still cannot meet the increasing demand for electronic-grade chlorine gas

Method used

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  • Preparation method of high-purity hydrogen chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of preparation method of high-purity hydrogen chloride, its concrete scheme is as follows:

[0024] The high-purity chlorine and high-purity hydrogen are fed into the synthesis furnace according to the intake rate of 1:1.3 for synthesis reaction. The intake pressure of high-purity chlorine and high-purity hydrogen is the same as 1MPa, and the temperature in the synthesis furnace is controlled at 1080°C. The synthesized hydrogen chloride gas is cooled to room temperature through the cooling tower, and then enters the condensation tower, where the temperature is lowered to minus 90°C, hydrogen and other non-condensable gases are removed, and the crude product of liquefied hydrogen chloride gas is obtained; then re-gasified, and then enters Deep separation type gas purifier, the inlet operating pressure of the purifier is 1MPa, the temperature is 50°C, and the flow rate is 300 standard liters / minute; the above-mentioned high-purity hydrogen chloride is obtained; the ...

Embodiment 2

[0033] A kind of preparation method of high-purity hydrogen chloride, its concrete scheme is as follows:

[0034] The high-purity chlorine and high-purity hydrogen are fed into the synthesis furnace at an intake rate of 1:1.2 for synthesis reaction. The intake pressure of high-purity chlorine and high-purity hydrogen is the same as 0.1MPa, and the temperature in the synthesis furnace is controlled at 1000°C , the synthesized hydrogen chloride gas is cooled to room temperature through the cooling tower, and then enters the condensation tower, where the temperature is lowered to minus 80°C, hydrogen and other non-condensable gases are removed, and the crude product of liquefied hydrogen chloride gas is obtained; then gasified again, and finally Enter the deep separation type gas purifier, the inlet operating pressure of the purifier is 0.1MPa, the temperature is 20°C, and the flow rate is 100 standard liters / minute; the above-mentioned a kind of high-purity hydrogen chloride is o...

Embodiment 3

[0043] A kind of preparation method of high-purity hydrogen chloride, its concrete scheme is as follows:

[0044] The high-purity chlorine and high-purity hydrogen are fed into the synthesis furnace according to the intake rate of 1:1.5 for synthesis reaction. The intake pressure of high-purity chlorine and high-purity hydrogen is the same as 1.5MPa, and the temperature in the synthesis furnace is controlled at 1200°C , the synthesized hydrogen chloride gas is cooled to room temperature through the cooling tower, and then enters the condensation tower, where the temperature is lowered to minus 100°C, hydrogen and other non-condensable gases are removed, and the crude product of liquefied hydrogen chloride gas is obtained; then gasified again, and finally Enter the deep separation type gas purifier, the inlet operating pressure of the purifier is 10MPa, the temperature is 60°C, and the flow rate is 400 standard liters / minute; the above-mentioned a kind of high-purity hydrogen ch...

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Abstract

The invention relates to the field of fine chemical industry, and in particular relates to a preparation method of high-purity hydrogen chloride. Compared with the prior art, the preparation method ofthe high-purity hydrogen chloride uses a styrene / ionic liquid high-crosslinking adsorbent which has a better effect of adsorbing hydrogen chloride impurities, and effectively reduces the impurity content of product gas; moreover, a deep separation type gas purifier is added, and tests show that the water content of the prepared high-purity hydrogen chloride can be reduced to 100 ppb or less and the gas impurities can be reduced to 50 ppb or less; moreover, compared with the prior separation type gas filter technology, the process is enlarged, the flow rate can reach 400 standard liters / minuteat the highest, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of fine chemicals, in particular to a method for preparing high-purity hydrogen chloride. Background technique [0002] Hydrogen chloride is a colorless gas with a pungent odor, and industrial hydrochloric acid will be slightly yellow due to impurities such as ferric salts. Its aqueous solution is called hydrochloric acid, which is a strong acid and is customarily called hydrochloric acid. It is mainly used to make dyes, spices, medicines, various chlorides and corrosion inhibitors. Hydrochloric acid is an aqueous solution of hydrogen chloride, which is a colorless or slightly yellow liquid and is volatile; high-purity hydrogen chloride gas is often used as a semiconductor material and / or lining The etching gas used for vapor phase etching of the bottom. [0003] 201910061131.3 It involves a high-purity hydrogen chloride gas preparation device, including a frame; a reaction tube is arranged in the frame; the reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/01C01B7/07B01J20/26B01J20/30
CPCB01J20/267C01B7/012C01B7/0718
Inventor 张广第叶向荣周井森张雪刚李军毛索源陈立峰夏添
Owner ZHEJIANG BRITECH CO LTD
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