Patent ID: 6121334
Filing Date: 2000-09-19
Classification: C10G

Abstract:
A method for removing high molecular weight, high melting point hydrocarbon vapors by condensation from a hydrocarbon-containing offgas vapor produced during the liquefaction of particulate waste plastic material, comprising:(a) contacting the hydrocarbon-containig offgas vapor directly with water at a condensation temperature above the melting point of the high molecular weight hydrocarbon vapors to produce a first high molecular weight liquid hydrocarbon condensate and a first uncondensed vapor stream;(b) separating the first high molecular weight liquid hydrocarbon condensate from the first uncondensed vapor stream;(c) cooling the first uncondensed vapor stream to a temperature of about 180.degree. F. to about 200.degree. F. to produce a second liquid condensate and a second uncondensed vapor stream;(d) separating the second liquid condensate from the second uncondensed vapor stream; and(e) contacting the second uncondensed vapor stream with a caustic scrubbing solution to neutralize any halide vapors and to form a hydrogen halide acid-free vapor stream.