Production of Bio-Phenols for Industrial Application: Scale-Up of the Base-Catalyzed Depolymerization of Lignin

• 作者: Bj?rn R??iger Daniela Pufky-Heinrich Gerd Unkelbach Robert R?ver
• 来源期刊: 绿色与可持续化学(英文)
• 学科: 化学
• 关键词: LIGNIN Base-Catalyzed DEPOLYMERIZATION PHENOLIC Monomers PHENOLIC Oligomers
• 年，卷（期）: 2017,（3）
• 页码范围: 193-202
• 页数: 10页
• 分类号: O6

摘要

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.