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Production of Bio-Phenols for Industrial Application

Scale-Up of the Base-Catalyzed Depolymerization of Lignin
: Rößiger, B.; Röver, R.; Unkelbach, G.; Pufky-Heinrich, D.

Fulltext ()

Green and sustainable chemistry 7 (2017), No.3, pp.193-202
ISSN: 2160-696X
ISSN: 2160-6951
Journal Article, Electronic Publication
Fraunhofer IGB ()

Objective of this study was the investigation on the up-scaling of base-catalyzed depolymerization (BCD) of lignin to pilot plant dimension. The cleavage process was carried out in dilute alkaline solution at temperatures up to 340°C and a pressure of 25 MPa in a continuously operated tubular flow reactor with throughputs up to 20 kg/h. Investigations included the proof of the feasibility of the scale-up as well as a parameter study on the cleavage of hardwood Organosolv lignin and softwood Kraft lignin within the established pilot plant. Yields and molecular compositions of the isolated product fractions BCD-oil (liquid phenolic fraction) and BCD-oligomers (solid phenolic fraction) are similar to those described in technical lab scale, showing a good scalability. Here, BCD-oils rich in phenolic monomers such as guaiacol, catechol and/or syringol were obtained with a content of up to 13.3 wt% and 14.5 wt% from Organosolv lignin and Kraft lignin, respectively. Formation of BCD-oligomers strongly depends on temperature and residence times within the reactor.