Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1989-02-06
1990-07-17
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 48, 159DIG13, 203 7, 210701, 210928, D21C 1102, C23F 1400
Patent
active
049419463
ABSTRACT:
A process for decreasing the tendency to form deposits in plants for evaporating spent sulfite liquors used to produce woodpulp. In the process, the liquors are treated with polyacrylic acids having a low molecular weight. In order to prevent virtually any deposition and to increase the evaporation rate, an aqueous solution of polyacrylic acid having a low molecular weight is added to the spent sulfite liquor in an entrance stage of the multiple-effect sulfite liquor in an entrance stage of the multiple-effect evaporating system and an aqueous solution of a copolymer of sulfonated styrene and maleic anhydride or an aqueous solution of a polyacrylic acid having a low molecular weight is added to the spent sulfite liquor in at least one succeeding stage of the multiple-effect evaporating system.
REFERENCES:
patent: 3514376 (1970-05-01), Slutsky
patent: 3516910 (1970-06-01), Engman et al.
patent: 4282178 (1981-08-01), Kharc
patent: 4288327 (1981-09-01), Godlewski
Begerow Klaus
Henn Manfred
Wichert Volker
Alvo Steve
Dubno Herbert
Metallgesellschaft Aktiengesellschaft
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