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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

Active Publication Date: 2012-05-23
TAIXING MEILAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the back-mixing of materials in the tank-type photochemical reactor is serious, and there are many by-products
And the equipment covers a large area. If there is a problem with one equipment, all production must be stopped.
Obviously not a good way
In addition, the current production process adopted in China often consumes high energy consumption, and the process has not been optimized reasonably

Method used

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  • Method and equipment for preparing difluoromonochloroethane by photochemical catalyst
  • Method and equipment for preparing difluoromonochloroethane by photochemical catalyst
  • Method and equipment for preparing difluoromonochloroethane by photochemical catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] see figure 1 , The photocatalytic reactor of the present invention includes a cylinder with a heat exchange jacket 20 on the outer wall and a polytetrafluoroethylene-lined inner wall.

[0042] The top of the cylinder is provided with a material outlet 21, the bottom of the cylinder is provided with a material inlet 22, and the top of the cylinder is provided with a spray device 23 made of polytetrafluoroethylene. The part below the spray device 23 is assembled by connecting up and down with four tower sections (for convenience, figure 1 Only one tower section is drawn, and the other three sections are omitted), figure 1 The middle tower section 24 is provided with four ultraviolet lamps arranged up and down, and the ultraviolet lamp is covered with a protective quartz glass tube, such as the quartz glass tube 25, the quartz glass tube 26, the quartz glass tube 27 and the quartz glass tube 28 in the figure .

[0043] The reactor has four tower sections, each of which ...

Embodiment 2

[0057] Prepare difluoro-chloroethane according to the process and equipment of the embodiment. The molar ratio of chlorine gas and difluoroethane is 1:1. After gasification, it is mixed with a mixer, heated to 40°C and entered into a photocatalytic reactor for reaction. The flow rate of the mixed gas of chlorine and difluoroethane in the photochemical reactor is 0.085m / s, and the reaction time is 100s. Difluoroethane, the amount of material sprayed into the tower is 10% of the amount of difluoroethane entering the mixer. The flow rate of cold water sprayed into the top of the reactor is 2m 3 / h.

[0058] Samples were taken from the top of the photocatalytic reactor, washed with alkali, dried, and then analyzed by gas chromatography. The components were difluorochloroethane: 89.55%, difluorooxane: 8.08%, unknown component 1: 1.34%, Unknown component 2: 0.8%, others: 0.23%, indicating that the method and reactor of the present invention have a high single-pass conversion rate ...

Embodiment 3

[0061] Prepare difluoro-chloroethane according to the process and equipment of the embodiment. The molar ratio of chlorine and difluoroethane is 1:1. After gasification, it is mixed with a mixer, heated to 55°C and entered into a photocatalytic reactor for reaction. The flow rate of the mixed gas of chlorine and difluoroethane in the photochemical reactor is 0.085m / s, and the reaction time is 90s. Difluoroethane, the amount of material sprayed into the tower is 10% of the amount of difluoroethane entering the mixer. The flow rate of cold water sprayed into the top of the reactor is 2m 3 / h.

[0062] Samples were taken from the top of the photocatalytic reactor, washed with alkali, dried, and then analyzed by gas chromatography. The components were difluoro-chloroethane: 85.95%, difluoro-alkane: 10.64%, unknown component 1: 1.74%, Unknown component 2: 1.67%, indicating that the method and reactor of the present invention have a high single-pass conversion rate and few by-prod...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/12C07C17/10
Inventor 陈惜明陈德钊
Owner TAIXING MEILAN CHEM
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