Process and device for evaporating liquids, for example...

Details Process and device for evaporating liquids, for example... Process and device for evaporating liquids, for example...

2005-05-03

2005-05-03

Manoharan, Virginia (Department: 1764)

Concentrating evaporators

Processes

Involving waste liquid

C159S002100, C159S026100, C159S028300, C159S043100, C159S049000, C159SDIG008, C159SDIG003, C162S030110, C162S046000

Reexamination Certificate

active

06887345

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 (1) of the falling-film type. The process is characterized in that the pressure on the liquid side in the falling-film heat exchanger (1) 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 (7) that has a lower steam.

REFERENCES:
patent: 2786518 (1957-03-01), Johan
patent: 3322648 (1967-05-01), Kays et al.
patent: 3366158 (1968-01-01), Rosenblad
patent: 4076576 (1978-02-01), Marttala
patent: 4857146 (1989-08-01), Andersson
patent: 5624531 (1997-04-01), Knuutila et al.
patent: 5716496 (1998-02-01), Agren
Tubel, a New Black Liquor Concentrator Technology, Jun. 1, 1999, A. Wernqvist, Paper Given at 6th Int. Conf on New Avail. Technologies Stockholm, SE Jun. 1, 1999-Jun. 5, 1999.

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