D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/36.7
D21C 11/00 (2006.01) D21C 11/02 (2006.01) D21C 11/10 (2006.01)
Patent
CA 1307878
ABSTRACT OF THE DISCLOSURE A process is described which serves to decrease 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 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.
585231
Begerow Klaus
Henn Manfred
Wichert Volker
Begerow Klaus
Grace Service Chemicals Gmbh
Henn Manfred
Metallgesellschaft Aktiengesellschaft
Robic
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