The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 03, 1989
Filed:
Mar. 30, 1989
Applicant:
Inventors:
Herbert Beneke, Castrop-Rauxel, DE;
Arnold Alscher, Essen, DE;
Rudolf Oberkobusch, Duisburg, DE;
Siegfried Peter, Uttenreuth-Weiher, DE;
Wolfgang Jaumann, Nuremberg, DE;
Assignee:
Rutgerswerke AG, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C10C / ; C10C / ;
U.S. Cl.
CPC ...
208 39 ; 208 45 ; 208433 ;
Abstract
A method of removing salts from coal tar and coal pitches comprising washing coal tar or coal pitch in a pressure container with water and a carbon dioxide containing gas at a temperature and pressure near the critical point of the gas in the optional presence of at least one member of the group consisting of a solvent and an entraining agent, removing the liquid or dissolved tar or pitch to obtain tar or pitch with a low salt content and removing the aqueous phase whereby all the resins remain in the tar or pitch.