Process for defluorinating anhydrous hydrogen chloride

Abstract

A process for defluorinating anhydrous hydrogen chloride as by-product in the technology for preparing hydrogen contained fluorchlorohydrocarbon features that the hydrogen chloride is pre-activated and then defluorinated in serially or parallelly connected defluorinating towers by adsorption at -10-80 deg.C and 0.1-20 MPa. The alumina is used as main component of defluorinating agent. Its advantage is high defluorinating effect (less than 10 ppm).

Description

technical field [0001] The invention relates to a method for defluorinating anhydrous hydrogen chloride in a hydrofluorochlorocarbon process. Background technique [0002] Internationally, in the production process of hydrochlorofluorocarbons, the by-product hydrogen chloride separated from the crude product is generally treated and utilized in two ways, that is, wet separation of hydrogen chloride and dry separation of hydrogen chloride. At present, in China, manufacturers that produce hydrochlorofluorocarbons all use wet methods to separate hydrogen chloride, and none of them use dry methods to separate hydrogen chloride. [0003] In the production process of hydrochlorofluorocarbons, the raw material undergoes a liquid-liquid catalytic fluorination reaction, and the product from the reactor undergoes rectification, and the separated hydrogen chloride is directly absorbed into industrial hydrochloric acid, which is wet separation of hydrogen chlor...

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Problems solved by technology

At present, in China, manufacturers producing hydrochlorofluorocarbons all use wet methods to separate hydrogen chloride, and none of them use dry methods to separate hydrogen chloride.

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