Method for recycling sulfur dioxide from sulfite pulping liquors

Details Method for recycling sulfur dioxide from sulfite pulping liquors Method for recycling sulfur dioxide from sulfite pulping liquors

1990-04-06

1992-03-17

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Including recovery of organic by-product

162 36, 162 45, D21C 1100

Patent

active

050965409

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.

REFERENCES:
patent: 3822180 (1974-07-01), Mita et al.
patent: 4148684 (1979-04-01), Farin
patent: 4187279 (1980-02-01), Rimpi
patent: 4336102 (1982-06-01), Jacobs et al.
patent: 4336189 (1982-06-01), Hamala et al.
Research Needs in the Pulp and Paper and Related Industries, The University of Maine, Jul. 12-13, 1988, pp. ix and xvi.

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