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:
Jul. 20, 1976
Filed:
Dec. 18, 1973
Applicant:
Inventors:
Roger M Rat, Saint-Medard-en-Jalles, FR;
Francois A Pollozec, Bergerac, FR;
Jean J Patouillet, Paris, FR;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B01D / ; B01D / ; C01B / ;
U.S. Cl.
CPC ...
159 / ; 159 29 ; 159 49 ; 159 / ; 159D / ; 159D / ; 159D / ; 23275 ; 23307 ; 423529 ; 423531 ;
Abstract
Dilute solutions of corrosive products, such as sulphuric or phosphoric acid, are concentrated by pre-concentrating the dilute solution and then introducing the pre-concentrated solution into a tunnel in which it flows in a thin layer over successive cascades while being heated, preferably by indirect radiant heating. An installation for carrying out the process is also described.