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A process for recovering difluorodibromomethane from bromotrifluoromethane raffinate

A technology of difluorodibromomethane and trifluorobromomethane, which is applied in the field of ODS substitutes, can solve the problems of environmental pollution, high treatment costs, and low utilization rate of raw materials for recycling and utilization of useful substances, and achieves the effects of increasing economic benefits and solving environmental pollution.

Active Publication Date: 2017-07-28
中化蓝天氟材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The residual liquid in the production process of trifluorobromomethane (H1301) is currently treated by high-temperature incineration, which not only has high treatment costs and certain environmental pollution, but also does not recycle useful substances, resulting in low raw material utilization.

Method used

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  • A process for recovering difluorodibromomethane from bromotrifluoromethane raffinate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the bromotrifluoromethane raffinate (1) obtained from the bromotrifluoromethane raffinate cylinder (A), the content of main components is 52% of difluorodibromomethane, 33% of difluorochlorobromomethane and 4% of difluorobromomethane. Pass the bromotrifluoromethane raffinate (1) through the filter decolorization device (B) at 200kg / h, and simultaneously keep the pressure of the bromotrifluoromethane raffinate steel cylinder (A) at about 0.2MPa. The difluorodibromide crude stream (2) obtained after filtering and decolorizing through the filter decolorization device (B) enters the lower body of the No. 1 rectification tower (C) for rectification, and the still temperature of the No. 1 rectification tower (C) is controlled. About 50°C, body temperature about 42°C, top temperature about 33°C, tower pressure about 0.12MPa, and reflux. From the tower top of No. 1 rectifying column (C), obtain the stream (3) that is substantially difluoro-bromomethane and difluoro-chloro-br...

Embodiment 2

[0024] In the bromotrifluoromethane raffinate (1) obtained from the bromotrifluoromethane raffinate steel cylinder (A), the main components include 58% difluorodibromomethane, 31% difluorochlorobromomethane and 3.6% difluorobromomethane. Pass the bromotrifluoromethane raffinate (1) through the filter decolorization device (B) at 250kg / h, and simultaneously keep the pressure of the bromotrifluoromethane raffinate steel cylinder (A) at about 0.2MPa. The difluorodibromide crude stream (2) obtained after filtering and decolorizing through the filter decolorization device (B) enters the lower body of the No. 1 rectification tower (C) for rectification, and the still temperature of the No. 1 rectification tower (C) is controlled. About 55°C, body temperature about 45°C, top temperature about 40°C, tower pressure about 0.17MPa, and reflux. From the tower top of No. 1 rectifying column (C), obtain the stream (3) that is substantially difluoro-bromomethane and difluoro-chloro-bromometh...

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Abstract

The invention discloses a process for recovering difluorodibromomethane from trifluorobromomethane residual liquid, which comprises the steps of filtration and decolorization, primary rectification, secondary rectification and drying. The process provided by the invention not only realizes the recovery and utilization of trifluorobromomethane residual liquid, but also turns waste into treasure, and recovers difluorodibromomethane.

Description

technical field [0001] The invention belongs to the field of ODS substitutes and relates to a process for separating and recovering difluorodibromomethane from bromotrifluoromethane raffinate. Background technique [0002] The raffinate in the bromotrifluoromethane (H1301) production process is currently treated by high-temperature incineration, which not only has high treatment costs and causes environmental pollution, but also does not recycle useful substances, resulting in low raw material utilization. [0003] The raffinate in the bromotrifluoromethane production process contains difluorodibromomethane (R1202), its molecular formula: CF 2 Br 2 , Molecular weight: 209.83, boiling point: 24.5 ° C, insoluble in water, methanol, ether, can be used in the synthesis of polymer pesticides, medicines, dyes and liquid crystal materials and fourth amine compounds. [0004] Therefore, it is very necessary to develop a process for recovering difluorodibromomethane from bromotrifl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/38C07C17/20C07C19/14
Inventor 洪健陈忠民程充育吕国洪
Owner 中化蓝天氟材料有限公司
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