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Separation method of chloropentafluoroethane and pentafluoroethane

A technology of monochloropentafluoroethane and pentafluoroethane, which is applied in the field of separation of monochloropentafluoroethane and pentafluoroethane, can solve uneconomical problems, reduce energy consumption, optimize process flow, and stabilize The effect of production

Active Publication Date: 2015-03-25
太仓中化环保化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with this method, due to the use of different extractants, two separate extraction and rectification systems are required to separate the extractants for recycling, which is not economical

Method used

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  • Separation method of chloropentafluoroethane and pentafluoroethane
  • Separation method of chloropentafluoroethane and pentafluoroethane

Examples

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Effect test

Embodiment 1

[0037] This embodiment provides a method for separating a mixture of chloropentafluoroethane and pentafluoroethane according to the above-mentioned process flow, and the raw materials and process conditions are as follows:

[0038] (1) In the mixture of chloropentafluoroethane and pentafluoroethane to be separated: the content of chloropentafluoroethane is 1wt%, the content of pentafluoroethane is 98.5wt%, tetrafluoroethane and its The homologue content is 3 / h；

[0039] (2) Extractant: petroleum hydrocarbon;

[0040] (3) Parameter setting of the primary extractive distillation column: the feed rate of the mixture of chloropentafluoroethane and pentafluoroethane to be separated is 2.4~2.6m 3 / h, the throughput of extractant is 8~11 m 3 / h, pressure 0.8~1.2MPa, return flow 4~7 m 3 / h；

[0041] Parameter setting of the secondary extractive distillation column: the feed rate of the mixture containing chloropentafluoroethane and pentafluoroethane is 0...

Embodiment 2

[0047] This embodiment provides a method for separating a mixture of chloropentafluoroethane and pentafluoroethane according to the above-mentioned process flow, and the raw materials and process conditions are as follows:

[0048] (1) In the mixture of chloropentafluoroethane and pentafluoroethane to be separated, the content of chloropentafluoroethane is 1.5 wt%, the content of pentafluoroethane is 98 wt%, tetrafluoroethane and its Congener content 3 / h；

[0049] (2) Extractant: petroleum ether (C 3 -C 6 ethers);

[0050] (3) Parameter setting of the primary extractive distillation column: the feed rate of the mixture of chloropentafluoroethane and pentafluoroethane to be separated is 2.4~2.6m 3 / h, the throughput of the extractant is 7~9m 3 / h, pressure 1.2~1.4 MPa, return flow 5~8 m 3 / h ；

[0051] Parameter setting of the secondary extractive distillation column: the feed rate of the mixture 7 containing chloropentafluoroethane and p...

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Abstract

The invention relates to a method for separating a mixture containing chloropentafluoroethane and pentafluoroethane to simultaneously obtain high purity chloropentafluoroethane with content more than or equal to 99.0 wt% and high-purity pentafluoroethane with content more than or equal to 99.8 wt%. The method is as below: treating a mixture containing chloropentafluoroethane and pentafluoroethane in a multistage extraction distillation system provided by the invention to obtain high purity pentafluoroethane and a mixture containing pentafluoroethane and chloropentafluoroethane; introducing the mixture containing pentafluoroethane and chloropentafluoroethane into an azeotropic distillation system provided by the invention for separation, so as to obtain high-purity chloropentafluoroethane and a mixture with low content of chloropentafluoroethane; and recycling the mixture with low content of chloropentafluoroethane to the multistage extraction distillation system. Compared with the prior art, the invention has reduced equipment investment and operation costs and realizes stable production.

Description

technical field [0001] The invention relates to a method for separating monochloropentafluoroethane and pentafluoroethane. Background technique [0002] Pentafluoroethane (R125) is a substitute for ODS (Ozone Depleting Substances) and ODP (Ozone Depletion Potential) is 0. It is a new type of green refrigerant. However, in its production process, ODS substances will also be generated at the same time. With the increasingly stringent environmental protection requirements, the content of ODS substances in pentafluoroethane products is subject to stricter and stricter restrictions. Therefore, how to use pentafluoroethane products The medium-depth separation of ODS substances is receiving more and more attention. [0003] The ODS substances in pentafluoroethane products vary with different production processes, and the most common one is monochloropentafluoroethane (R115). Since R115 and R125 can form an azeotropic mixture, it is difficult to pass the conventional refining proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/12C07C19/08C07C17/386
Inventor 卢志勇王军付亚国顾鑫虞贤波黄海生
Owner 太仓中化环保化工有限公司
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