Process for purifying and rectifying sulfur tetrafluoride

A sulfur tetrafluoride and rectification technology, which is applied in the direction of sulfur and halogen compounds, can solve the problems of low-temperature bottling technology, such as danger, high risk, and large damage to steel cylinders, and achieve high safety, increase yield, and reduce wasteful effect

Active Publication Date: 2012-05-09
山东锐华氟业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the above problems, overcome the defects of large damage and high risk to steel cylinders in its alcohol low-temperature freezing (-80°C) bottling technology, and provide a method for the production of sulfur tetrafluoride. Sulfur products are captured, purified, and rectified, and the problem of the danger of low-temperature bottling technology is solved

Method used

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  • Process for purifying and rectifying sulfur tetrafluoride
  • Process for purifying and rectifying sulfur tetrafluoride
  • Process for purifying and rectifying sulfur tetrafluoride

Examples

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Embodiment 1

[0024] Purification and rectification process of sulfur tetrafluoride (1)

[0025] A, the crude sulfur tetrafluoride gas synthesized by the reaction passes through a cooler and a condensation separator so that part of the iodine contained in the crude gas is solidified and retained, and iodine pentafluoride is liquefied and retained; the sulfur tetrafluoride mixed gas is separated; the cooling The cooling temperature of the device is 10°C, and the condensation temperature of the condensation separator is -35°C;

[0026] B. The separated sulfur tetrafluoride mixed gas also contains part of fluorine gas, nitrogen gas, hydrogen fluoride gas and trace amounts of impurity gases such as iodine and iodine pentafluoride. Condensate into a liquid state, and then separate the impurity gas through gas phase purification to obtain a liquid primary sulfur tetrafluoride product with a purity of 95%; the condensation temperature of the condensation trap is -100°C;

[0027] C. The primary su...

Embodiment 2

[0029] Purification and rectification process of sulfur tetrafluoride (2)

[0030] A, the crude sulfur tetrafluoride gas synthesized by the reaction passes through a cooler and a condensation separator so that part of the iodine contained in the crude gas is solidified and retained, and iodine pentafluoride is liquefied and retained; the sulfur tetrafluoride mixed gas is separated; the cooling The cooling temperature of the device is 30°C, and the condensation temperature of the condensation separator is 30°C;

[0031] B. The separated sulfur tetrafluoride mixed gas also contains part of fluorine gas, nitrogen gas, hydrogen fluoride gas and trace amounts of impurity gases such as iodine and iodine pentafluoride. Condensate into a liquid state, and then separate the impurity gas through gas phase purification to obtain a liquid primary sulfur tetrafluoride product with a purity of 98%; the condensation temperature of the condensation trap is -40°C;

[0032] C. The primary sulf...

Embodiment 3

[0034] Purification and rectification process of sulfur tetrafluoride (3)

[0035] A, the crude sulfur tetrafluoride gas synthesized by the reaction passes through a cooler and a condensation separator so that part of the iodine contained in the crude gas is solidified and retained, and iodine pentafluoride is liquefied and retained; the sulfur tetrafluoride mixed gas is separated; the cooling The cooling temperature of the device is 20°C, and the condensation temperature of the condensing separator is -3°C;

[0036] B. The separated sulfur tetrafluoride mixed gas also contains part of fluorine gas, nitrogen gas, hydrogen fluoride gas and trace amounts of impurity gases such as iodine and iodine pentafluoride. Condensate into a liquid state, and then separate the impurity gas through gas phase purification to obtain a liquid primary sulfur tetrafluoride product with a purity of 97%; the condensation temperature of the condensation trap is -70°C;

[0037] C. The primary sulfur...

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Abstract

The invention relates to a process for purifying and rectifying sulfur tetrafluoride, which comprises the following steps of: reacting iodine pentafluoride and sulfur in a sulfur tetrafluoride reactor to synthesize crude sulfur tetrafluoride gas, obtaining a liquid primary sulfur tetrafluoride product with purity of more than or equal to 95 percent through a cooler, a condensation separator and acondensation trap, obtaining a liquid sulfur tetrafluoride product with purity of more than or equal to 99.9 percent by a rectifying process, and continuously charging the product into a steel bottle. The liquid sulfur tetrafluoride product is directly trapped and produced and continuously liquefied and bottled, so damage of low-temperature bottling to the steel bottle is avoided, and the safety is higher. The purity of the sulfur tetrafluoride product is greatly improved by the cooling, separation, trapping and continuous rectification technology adopted in the process.

Description

technical field [0001] The invention relates to a process for purifying and rectifying recovery of fluorine chemical products, more specifically, the invention relates to a process for purifying and rectifying sulfur tetrafluoride, which belongs to the field of fluorine chemical industry. Background technique [0002] Abroad, the United States uses alkali metal fluoride and sulfur to react to synthesize sulfur tetrafluoride; the United States also uses fluorine gas and sulfur to directly react to generate sulfur tetrafluoride (SF 4 ): containing sulfur hexafluoride (SF 6 ), sulfur difluoride (SF 2 ), and containing highly toxic decafluorooxydisulfide (S 2 0F 10 ) and other impurities; the utilization rate of fluorine is low, and the impurity content is much difficult to rinse and purify, the recovery rate is low, and the waste is large; there is no large-scale industrial production of sulfur tetrafluoride abroad. [0003] At present, there are only a few companies produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/45
Inventor 李学庆
Owner 山东锐华氟业有限公司
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