Process for removing acetylene from hydrogen chloride gas
AssigneePPG Industries, Inc.
InventorRichard H. Miller
Life of this patent
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Abstract
By-product hydrogen chloride obtained from cracking of 1,2-dichloroethane is purified of minor concentrations of acetylene by contact with activated carbon at a temperature of at least 375.degree. F. (190.6.degree. C.).
Claims9
In the thermal dehydrochlorination of dichloroethane to form (1) vinyl chloride and (2) by-product hydrogen chloride substantially free of elemental chlorine wherein said by-product hydrogen chloride contains at least 200 parts per million by weight of acetylene, the improvement which comprises purifying said by-product hydrogen chloride by contacting a vaporous stream of said hydrogen chloride with activated carbon in a reaction zone free of catalytically effective amounts of acetylene hydrochlorination catalyst and added elemental chlorine at a temperature of at least 190.6.degree. C. for a time sufficient to reduce by hydrochlorination the acetylene content thereof below 50 parts per million by weight.
A process for the hydrochlorination of acetylene present in a gaseous stream of hydrogen chloride in amounts of at least 200 parts per million parts by weight of hydrogen chloride, said stream being substantially free of elemental chlorine, which comprises contacting said gaseous stream with activated carbon in a reaction zone free of catalytically effective amounts of acetylene hydrochlorination catalyst and added elemental chlorine at a temperature of at least 190.6.degree. C. for a time sufficient to reduce by hydrochlorination the acetylene content of said stream below 50 parts per million by weight.
Dependencies are inferred from the claim text.