Method of production of solids-free coal tar pitch

US5843298A · kind A · utility

Assignee

• UCAR Carbon Technology Corporation · US

Inventors

• Thomas H. Orac · Strongsville, US
• Ching-Feng Chang · Strongsville, US
• Irwin C. Lewis · Strongsville, US
• Richard L. Shao · North Royalton, US

Key dates

• Filing date: Sep 27, 1996
• Grant date: Dec 1, 1998
• Expiry date: Sep 27, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10C1/16
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for converting coal tar containing quinoline-insoluble particles (Q.I.) produces a substantially Q.I.-free coal tar pitch and a separate, Q.I.-containing coal tar pitch. Dehydrated coal tar, soft coal tar pitch or hard coal tar pitch are subjected to continuous cross flow filtration in a circulation loop to obtain a substantially Q.I.-free stream and, concurrently, a Q.I.-containing stream. The two streams are then separately subjected to further fractionation, if any, to produce the substantially Q.I.-free hard coal tar pitch and separate Q.I.-containing hard coal tar pitch.