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Pentafluoroethane purification method

A pentafluoroethane and purification method technology, applied in the field of pentafluoroethane purification, can solve the problems of difficulty in improving the purity of HFC-125 products, purification of HFC-125, and insufficient extraction and separation efficiency, and achieve simple structure and high process efficiency. Simple and effective in improving extraction and separation efficiency

Active Publication Date: 2017-09-22
ZHEJIANG SANMEI CHEM IND
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Problems solved by technology

The crude product in the production process often contains other halogenated hydrocarbon impurities, only CFC-115 has a boiling point close to that of HFC-125 (boiling point of CFC-115 -38.7°C, boiling point of HFC-125 -48.5°C), and this The relative volatility of the two compounds is close to 1, and they cannot be completely separated by ordinary fractional distillation techniques to achieve the purpose of purifying HFC-125
Extractive distillation is an effective way to solve this problem, but there are common problems such as insufficient extraction and separation efficiency, expensive extractant, or high residual amount of extractant in HFC-125 products, which makes it difficult to improve the purity of HFC-125 products

Method used

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Embodiment Construction

[0025] Such as Figure 1 to Figure 3 Shown, be the purification method of a kind of pentafluoroethane of the present invention, comprise the steps:

[0026] (a) Preliminary reaction device: first check the airtightness of rectification tower 1, distillation tower 2, reflux tank 3 and fixed bed reactor by conventional methods, install liquid distributor 4 in rectification tower 1, and evenly arrange rectification Packing in tower 1 and distillation tower 2, and then preheating rectification tower 1 and distillation tower 2 to avoid air leakage in the device during operation and affect the yield of the product. The effect, thereby improving the purity of the finished product, preheating the device in advance can effectively reduce the extraction time, speed up the separation efficiency, and reduce energy consumption. The rectification column 1 is provided with a support grid 5, which is located below the liquid distributor 4, and a stainless steel corrugated wire mesh structure...

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Abstract

The present invention discloses a pentafluoroethane purification method, which comprises: (a) preparing a reaction device; (b) carrying out extracting rectification; (c) carrying out distillation purification; and (d) using a by-product. According to the present invention, the method has advantages of simple process and easy control; the method sequentially comprising extracting rectification and distillation is used, such that the separation efficiency is high, the crude product is effectively separated, the purity of the separated finished product pentafluoroethane can achieve more than 99.9%, the purity is high, and the quality is good; and the separated by-product chloropentafluoroethane is recycled, and is converted into the product pentafluoroethane so as to improve the utilization rate of the by-product and turn the waste into treasure.

Description

technical field [0001] The invention belongs to the technical field of pentafluoroethane purification, in particular to a method for purifying pentafluoroethane. Background technique [0002] Pentafluoroethane (HFC-125) has been widely used as a new generation of ozone-depleting substances (ODS) substitutes in refrigerants, blowing agents, propellants and fire extinguishing agents. The crude product in the production process often contains other halogenated hydrocarbon impurities, only CFC-115 has a boiling point close to that of HFC-125 (boiling point of CFC-115 -38.7°C, boiling point of HFC-125 -48.5°C), and this The relative volatility of the two compounds is close to 1, and the purpose of purifying HFC-125 cannot be completely separated only by ordinary fractionation techniques. Extractive distillation is an effective way to solve this problem, but there are common problems such as insufficient extraction and separation efficiency, expensive extractant, or high residual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/23C07C17/383C07C17/386C07C19/08
CPCC07C17/23C07C17/383C07C17/386C07C19/08
Inventor 占林喜陈国荣王晓东林寿洪钱康富胡彬陈德勇徐武平
Owner ZHEJIANG SANMEI CHEM IND
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