D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/36.2
D21C 11/02 (2006.01) D21C 11/00 (2006.01) D21C 11/10 (2006.01)
Patent
CA 2021240
ABSTRACT Combined acidification and evaporative concentration of sulfite based chemical and sulfite based semichemical spent liquors expel massive amounts of gaseous sulfur dioxide and water vapor from the spent liquor. The concentration of the expelled sulfur dioxide is sufficiently high so that the sulfur dioxide and water vapor can be recycled directly, without further separation, to produce fresh sulfite pulping liquor.
Norman Jack C.
Sell Nancy J.
Norman Jack C.
Sell Nancy J.
Swabey Ogilvy Renault
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