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. 23, 2010
Filed:
May. 12, 2004
Applicants:
Ilkka Olavi Laitinen, Gammelby, FI;
Teppo Nurminen, Vantaa, FI;
Mauri Salmisuo, Tuusula, FI;
Inventors:
Assignee:
STERIS Europe Inc. Suomen Sivuliike, Tuusula, FI;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B01D 1/22 (2006.01); B01D 1/26 (2006.01); B01D 3/28 (2006.01); C02F 1/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
Purified water for special purposes is produced using a falling-film multieffect evaporator. From the feed water, each effect produces a steam phase and a water phase. The steam phase is used for heating in the subsequent evaporating step, whereby the steam phase condenses to product water, and the water phase becomes feed water for the subsequent evaporation step. According to the invention, the product water may be wholly or partly recycled to the initial feed water, allowing process startup and sterilisation of the plant without conducting hot product water to the drain.