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:
Mar. 01, 1977
Filed:
Jun. 12, 1974
Applicant:
Inventors:
Helmold von Plessen, Kelkheim, Taunus, DT;
Eberhard Fischer, Hofheim, Taunus, DT;
Siegfried Schiessler, Frankfurt am Main, DT;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ; C23F / ;
U.S. Cl.
CPC ...
423269 ; 134 12 ; 203-7 ; 203 28 ; 252387 ; 423523 ; 423525 ; 423531 ;
Abstract
Contaminated sulfuric acid which may contain water, organic compounds and inorganic salts is converted to almost pure concentrated sulfuric acid by passing the acid through a Pauling plant and distilling the concentrated contaminated acid. Addition of nitric acid improves the decomposition of organic compounds and ammonium salts of the contaminated acid.