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:
May. 03, 2005
Filed:
Nov. 20, 2001
Ismo Hirvonen, Tampere, FI;
Randy Stern, Charlotte, NC (US);
Ismo Hirvonen, Tampere, FI;
Randy Stern, Charlotte, NC (US);
Kvaerner Pulping AB, Karlstad, SE;
Abstract
The present invention relates to a process and a device for evaporating liquids, for example black liquor from cellulose cooking, which contain solid and dissolved substances which are to be concentrated. The liquid is heated to close to boiling temperature in a heat exchanger () of the falling-film type. The process is characterized in that the pressure on the liquid side in the falling-film heat exchanger () is kept so high that boiling does not take place in this heat exchanger and in that the evaporation takes place, by means of flashing, in a separate expansion tank () that has a lower steam.