FOERFARANDE FOER SEPARERING AV LIGNIN OCH FENOL FRAON FENOLLOESNINGAR

• Main Author: EKMAN,KURT
• Format: Patent
• Language: Finnish; Swedish
• Published: 10.01.1989
• Edition: 4
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; APPARATUS THEREFOR; CHEMISTRY; COMPOSITIONS BASED THEREON; DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; PAPER-MAKING; PRODUCTION OF CELLULOSE; PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP

A process for separating lignin and recovering phenol from a phenol solution obtained by treating a lignocellulose-containing material with a phenol-containing solution comprises the steps of:- (1) extracting (19) the phenol solution (A, 18) with water or with an aqueous solution (20) at elevated temperature to give a phenol-containing aqueous phase (B) and a lignin-containing organic phase (C); (2) reducing the temperature (21) of the phenol-containing aqueous phase (B) so that there is formed a phenol phase of low water content (D), and an aqueous phase of low lignin content (E); and (3) the low lignin content aqueous phase (E) is returned to step (1) and lignin (28) is recovered (26) from the lignin-containing organic phase (C) produced in step (1). n