Isolation and Characterization of Lignin from Sapele (): Application in Flexible Polyurethane Foam Production.

Lignin used in this work was isolated from sapele () wood through a hybrid pulping process using soda/ethanol as pulping liquor and denoted soda-oxyethylated lignin (SOL). SOL was mixed with a polyethylene glycol (PEG)-glycerol mixture (80/20 /) as liquefying solvent with 98% wt. sulfur acid as catalyst, and the mixture was taken to boil at 140 °C for 2, 2.