Cleaning condensates from multi-effect evaporator of cellulose p

Details Cleaning condensates from multi-effect evaporator of cellulose p Cleaning condensates from multi-effect evaporator of cellulose p

1995-09-05

1998-11-03

Manoharan, Virginia

Concentrating evaporators

Multiple effects

159 242, 159 473, 202174, 203 25, 203 27, 162 46, 162 47, 162 68, B01D 126, B01D 302, D21C 1106

Patent

active

058303146

ABSTRACT:
Volatile compounds, such as methanol, are separated from secondary condensates formed in multi-effect evaporation of waste liquor, such as black liquor, from cellulose pulp processes. The condensable secondary vapor is condensed into first and second condensate flows, the first of which, smaller in volume, contains the majority of the volatile compounds condensed in the evaporating effect. The first condensate flows from one or more first evaporation effects, and/or condensers of the evaporation plant, are directed for cleaning into a first steam stripping column. At least some of the second flows are directed to a second steam stripping column to be recovered as very clean condensate, cleaner than the condensate flow from the first stripping column and typically have a methanol concentration of less than 25 ppm, preferably about 10 ppm or less.

REFERENCES:
patent: 3807479 (1974-04-01), Brannland et al.
patent: 4002525 (1977-01-01), Baierl
patent: 4100016 (1978-07-01), Diebole et al.
patent: 4878535 (1989-11-01), Rosenblad
patent: 5382321 (1995-01-01), Fagerlind et al.
"Chemical Recovery in the Alkaline Pulping Processes", Third Edition, Prepared by the Alkaline Pulping Committee of the Pulp Manufacture Division Committee Assignment No. 6500; Co-edited by Robert P. Green and Gerald Hough; TAPPI Press .COPYRGT.1992.
Design Considerations for Condensate Segregation and Methanol/TRS Stripping, Beckstrom et al, 1992 Kraft Recovery Operations Short Course, pp. 141-149.

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