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:
Feb. 28, 1978
Filed:
Oct. 04, 1976
Applicant:
Inventors:
Horst Buelow, Frankenthal, DT;
Heinz Hohenschutz, Mannheim, DT;
Johannes E Schmidt, Ludwigshafen, DT;
Werner Sachsze, Ludwigshafen, DT;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen am Rhine, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; C07C / ;
U.S. Cl.
CPC ...
203 15 ; 203 58 ; 203 84 ; 260542 ;
Abstract
Formic acid is purified by extractive distillation of its aqueous solutions using a basic extractant, followed by distillation of the bottom mixture first obtained, the extractant used being N-formylmorpholine.