1,1,1,3,3,3-hexafluoropropane purification with photochlorination equipment

a technology of photochlorination equipment and hexafluoropropane, which is applied in the direction of halogenated hydrocarbon preparation, halogenated hydrocarbon separation/purification, organic chemistry, etc., can solve the problems of unsatisfactory effects on the environment, and troublesome impurities in certain fluorocarbons
US20070102281A1Active Publication Date: 2007-05-10HONEYWELL INT INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
HONEYWELL INT INC
Publication Date
2007-05-10

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Abstract

A continuous, vapor phase method for purifying a crude mixture of 1,1,1,3,3,3-hexafluoropropane and one or more unsaturated fluorocarbon compounds, the process comprising: a) providing a photochlorinator vessel comprising: 1) a UV lamp unit comprising a UV lamp located in a transparent inner well, the transparent inner well being located within a transparent outer well, the outer well being provided with material for cooling walls of the inner and outer wells; the inner well and the outer well defining separate chambers isolated from each other; and 2) a reaction vessel into which the UV lamp unit has been inserted; b) introducing into the reaction vessel a gaseous mixture of Cl2 and a distillation inseparable mixture of 1,1,1,3,3,3-hexafluoropropane and one or more unsaturated fluorocarbon compounds; c) reacting, in the gaseous state and in the presence of UV light from the photochlorinator, the mixture with Cl2 with the distillation inseparable mixture of 1,1,1,3,3,3-hexafluoropropane and one or more unsaturated compounds to saturate unsaturated fluorocarbons into a reacted mixture, and d) separating a purified 1,1,1,3,3,3-hexafluoropropane product containing less than 1000 ppm, most preferably less than 100 ppm unsaturated fluorocarbons.
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Description

FIELD OF THE INVENTION

[0001] This invention relates to a continuous, vapor phase process for purifying 1,1,1,3,3,3-hexafluoropropane (HFC-236fa) to a level of <1000 ppm, preferably <500 ppm, and more preferably <100 ppm, total unsaturates using a UV photochlorinator. BACKGROUND OF THE INVENTION

[0002] Due to their stability, relatively low toxicity, compatibility with numerous substances, and low vaporization points, short chain fluorocarbons have been found to have utility or potential utility in industry for many purposes. Such short chain fluorocarbons (about 1 to about 5 carbon atoms) have, for example, been used as propellants, refrigerants, and solvents.

[0003] It has been asserted that certain fluorocarbons, especially chlorofluorocarbons, unfortunately may be hazardous to the environment, especially to the ozone layer. Further, impurities in certain fluorocarbons have been found to be troublesome. Unsaturated fluorocarbons are especially undesirable since many of t...

Claims

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