Pitch fractionation and high softening point pitch

Mineral oils: processes and products – Asphalts – tars – pitches and resins; making – treating and... – By distillation

Reexamination Certificate

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Details

C208S022000, C208S040000, C208S044000, C208S049000, C208S050000, C208S067000, C208S072000, C208S085000, C208S131000

Reexamination Certificate

active

07318890

ABSTRACT:
A process for fractionating crude pitch by direct contact heating with molten metal is disclosed. The crude pitch, which may contain water, contaminants and/or distillables is heated by direct contact heat exchange with molten metal, preferably maintained as a metal continuous bath, operating at a temperature of 100 to 600° C. The molten metal heating zone is maintained at a temperature and pressure sufficient to vaporize a desired amount of contaminants or volatile material from crude pitch to produce pitch product having a desired softening point. New pitch materials, having a softening point above those achievable by conventional techniques, are also produced.

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