PROCESS FOR SEPARATING AN ETHYLENICALLY UNSATURATED HYDROCARBON FROM A HYDROCARBON MIXTURE; PROCESS FOR SEPARATING CLOSE BOILING LIQUIDS; PROCESS FOR INHIBITING POLYMERIZATION OF STYRENE

摘要

Process for separating hydrocarbons with double bounds (styrene, butadiene, isoprene etc) from hydrocarbon mixtures containing them by extractive distillation with an amine with more than one amino-group (e.g. N-aminoethylpiperazine) as solvent. N-aminoethylpiperazine can also be used as solvent in the extractive distallation of close-boiling liquids or as polymerization inhibitor for styrene.