Method and equipment for preparing difluoromonochloroethane by photochemical catalyst

A technology of difluoro-chloroethane and difluoroethane, which is applied in the field of photocatalytic production of difluoro-chloroethane, can solve the problems of large equipment footprint, not a good one, and many by-products, and achieve The effect of small footprint, less material back-mixing, and less by-products
CN101456788BActive Publication Date: 2012-05-23TAIXING MEILAN CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TAIXING MEILAN CHEM
Publication Date
2012-05-23

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Abstract

The invention discloses a method for preparing difluoro monochloro ethane in a photocatalytic reactor, which comprises: firstly, chlorine gas and difluoroethane are mixed and enter the photocatalytic reactor for reaction to generate a difluoro monochloro ethane crude product; and secondly, the difluoro monochloro ethane crude product is subjected to water washing, alkaline washing, deaeration, rectification and drying to obtain the difluoro monochloro ethane finished product. The photocatalytic reactor adopted during reaction comprises a cylinder body, wherein the outer wall of the cylinder body is provided with a heat exchange jacket, and the inner wall of the cylinder body is lined with anticorrosive materials; material openings are arranged on the top and the bottom of the cylinder body; a spray device is arranged on the top of the inside of the cylinder body; the part below the spray device is formed by communicating and assembling four tower sections up and down; and each tower section is provided with four ultraviolet lamps which are arranged up and down, three temperature measurement openings which are arranged up and down, and a liquid difluoroethane feed opening. The method has high once-through conversion and less byproducts; and the selectivity during reaction is higher than 95 percent. Moreover, the photocatalytic reactor has small floor occupation and a compact structure, and less backmixing of materials.
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Description

technical field

[0001] The invention relates to equipment and a production process for producing difluorochloroethane by photocatalysis. Background technique

[0002] Difluorochloroethane (CH 3 CF 2 Cl, commonly known as 142b) is a colorless, odorless, anesthetic gas with a boiling point of -0.96°C. It can be burned in the air and can be used as a refrigerant and aerosol. It is a substitute for Freon due to its small damage to the ozone layer. supplies. The production process of difluoro-chloro-alkane is as follows:

[0003]

[0004] That is, after difluoroethane is mixed with equimolar chlorine gas, it undergoes photocatalytic chemical reaction to generate the target difluorochloroethane and hydrogen chloride, and the mixed gas is removed from hydrogen chloride and purified to obtain a high-purity product. Since chlorine is a strong oxidizing agent, if the reaction time is long, more by-products will be produced in the reaction process, which will affect the yield of...

Claims

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