Preparation method and device of sulfur tetrafluoride

Abstract

The invention provides a preparation method of sulfur tetrafluoride, which comprises the following steps: mixing fluorine gas and inert gas, introducing the mixture into a reactor filled with sulfur-containing liquid, and reacting to obtain a head product; carrying out liquefaction, light emission and vaporization treatment on the initial product to obtain sulfur tetrafluoride; and carrying out liquefaction, light emission and vaporization treatment on the discharged light gas to obtain a byproduct carbon tetrafluoride. The invention further provides a sulfur tetrafluoride preparation device adopted by the preparation method, the sulfur tetrafluoride preparation device comprises a fluorination reactor, the fluorination reactor is connected with a low-temperature collector I, the low-temperature collector I is connected with a sulfur tetrafluoride storage tank and a low-temperature collector II, and the top of the low-temperature collector II is connected with a carbon tetrafluoride storage tank. The method disclosed by the invention is low in reaction temperature, short in time, high in selectivity and high in added value of byproducts, and blockage of solid products to pipelines and valves is avoided; according to the device, the length of the reactor is shortened, the production process of sulfur tetrafluoride is simplified, and the device has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of gas preparation, and in particular relates to a method and device for preparing sulfur tetrafluoride. Background technique [0002] As an organic fluorinating agent, sulfur tetrafluoride can selectively fluorinate carbonyl and hydroxyl groups, and has a unique role in the preparation of water and oil repellents, lubricating oil additives, surface treatment agents, pharmaceutical anesthetics, fiber treatment agents and film production. . In addition, sulfur tetrafluoride can be used as electron gas, chemical vapor deposition, surface treatment agent, plasma dry etching, etc. Sulfur tetrafluoride is also an intermediate for the preparation of heat-conducting medium sulfur hexafluoride. [0003] Due to the irreplaceable status of sulfur tetrafluoride in the production of fine chemicals, liquid crystal materials and high-end pharmaceutical industries, the current market for sulfur tetrafluoride products is ...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a preparation method and device for sulfur tetrafluoride in view of the deficiencies of the above-mentioned prior art. The sulfur-containing substance used in the present invention is liquid at normal temperature and pressure, replacing the traditional The production process of liquid sulfur as raw material avoids the blockage of process pipelines and valves caused by the sublimation and condensation of sulfur; at the same time, the nature of liquid sulfur-containing substances is active, which speeds up the reaction rate, and the by-product is gaseous carbon tetrafluoride, which will not make pipelines , the valve is blocked, and it is an electronic gas used in the semiconductor industry, and the added value of the by-product is high; the preparation device of sulfur tetrafluoride of the present invention replaces the traditional tubular reactor with a fluorination tank reactor, which greatly reduces the cost of the equipment. Volume, and reduce the reaction problem of synthetic sulfur tetrafluoride, making the reaction of sulfur tetrafluoride production safer and more stable

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