Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1992-03-20
1994-12-06
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 3011, 162 50, 431 1, 431186, D21C 1112
Patent
active
053707710
ABSTRACT:
A process and reactor for recovering energy and chemicals from spent liquor obtained in pulp production by thermal decomposing the spent liquor are described, said decomposing being carried out in a reactor at a pressure of from atmospheric pressure up to 150 bar and at a temperature of 500.degree.-1500.degree. C. so that a gas and solid and/or molten inorganic material are formed, said gas being rich in energy to be used as fuel or being useful as raw material for chemical production. According to the invention the thermal decomposition of the spent liquor is carried out during exposure to low frequency sound and without or with simultaneously supply of oxygen or a gas containing oxygen in an amount below that stoichiometrically required for complete oxidation of the substances formed at the thermal decomposition. The reactor comprises at least one sound generator arranged to generate low frequency sound in the reactor.
REFERENCES:
patent: 4501205 (1985-02-01), Funk
patent: 4650413 (1987-03-01), Olsson et al.
patent: 4808264 (1989-02-01), Kignell
patent: 5059404 (1991-10-01), Mansour et al.
"Perry's Chemical Engineers's Handbook"; Sixth Edition; pp. 9-38 and 9-39.
Alvo Steve
Chemrec Aktiebolag
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