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. 04, 1980
Filed:
Dec. 23, 1977
Applicant:
Inventors:
Martin Schulze, Neviges, DE;
Gerhard Preusser, Essen, DE;
Assignee:
Krupp-Koppers GmbH, Essen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; C23F / ;
U.S. Cl.
CPC ...
203-3 ; 203-7 ; 203 33 ; 203 35 ; 203 43 ; 203 51 ; 203 58 ; 208326 ; 252387 ; 422-7 ; 585855 ; 585860 ;
Abstract
In order to prevent corrosion of the apparatus in extraction and extractive distillation processes where N-substituted morpholine is employed as the selective solvent an additive is added to the solvent which additive consists of (a) phosphoric acid, (b) a salt thereof, (c) a vanadium compound, (d) a molybdenum compound or (e) a mixture of two or more of these compounds, the addition being effected in an amount of about 0.005 to 0.02% by weight of the morpholine solvent.