Process for increasing meso phase contents in pitch

US4976845A · kind A · utility

Inventors

• Peter Oerlemans · Huissen, NL
• Rolf Marrett · Castrop-Rauxel, DE
• Armin Eckert · Philippsburg, DE
• Klaus Altfeld · Bochum, DE

Key dates

• Filing date: Sep 1, 1989
• Grant date: Dec 11, 1990
• Expiry date: Sep 1, 2009

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D01F9/145
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for increasing the content of mesophase in a pitch includes using a high molecular aromatic fraction based on a material selected from the group consisting of coal tar, crude oil and their mixture in molten form, thermally treating the fraction in form of a thin, continously moving film, and removing volatile components by degassing during the thermal treatment. The process distinguishes in using a high molecular aromatic fraction which may contain mesophase, shaping the fraction continuously mechanically to a thin film with a layer of thickness of between substantially 0.007 and 2 cm, successively mechanically forcedly transporting the film with the use of shear forces through at least one homogenization zone and one degassing zone, performing a mechanical homogenization of the film in the homogenization zone, performing a removal of readily volatile components in the degassing zone, and maintaining the temperature of the film in the homogenization zone and in the degassing zone in the region of between 320.degree. C. and 470.degree. C.