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:
Jan. 01, 1991
Filed:
Sep. 21, 1989
Klaus Hohmann, Hofheim, DE;
Manfred Mai, Frankfurt am Main, DE;
Metallgesellschaft AG, Frankfurt am Main, DE;
Abstract
The solutions are concentrated by multiple-effect evaporation in indirectly heated evaporators. The highest concentration of the solution is reached in a final evaporator stage, which is heated with live steam. The final evaporators stage includes two to four falling-film evaporators, all of which are heated with live steam. The falling-film evaporators are consecutively flown through by the solution. Vapor is withdrawn from that falling-film evaporator which is the first to be supplied with the solution and at least part of said vapor is directly contacted with the solution as it flows down through the heating zone of at least one other evaporator of the final stage. From that falling-film evaporator of the final stage which is the first to be supplied with the solution the vapor may be fed to all other evaporators of the final stage.