Procedure for separating lignin and phenol from phenol...

Details Procedure for separating lignin and phenol from phenol... Procedure for separating lignin and phenol from phenol...

C - Chemistry, Metallurgy

07

C

260/133, 260/624

C07C 37/72 (2006.01) C07C 39/04 (2006.01) D21C 11/00 (2006.01) C08H 6/00 (2010.01) C07G 1/00 (2006.01)

Patent

CA 1284491

ABSTRACT OF THE DISCLOSURE Separation of lignin and phenol from phenol solutions which are obtained from phenol digestion of lignocellulose- containing materials, The organic phase containing lignin and phenol is extracted with water or an aqueous solution at elevated temperature, whereby a phenol-containing aqueous phase and a lignin-containing organic phase are obtained. The temperature of the aqueous phase is lowered, whereby a low water-content phenol phase and a low lignin-content aqueous phase are obtained, the latter returned at elevated temperature to the extraction that is being carried out. The phenol phase is utilized towards preparing fresh digesting solution. The lignin is precipated with water from the lignin-containing organic phase.

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