报告题目：Maleic Acid Hydrotropic Fractionation at Atmospheric Pressure for Sustainable Forest Biorefinery: Biofuels, Biochemicals, and Biomaterials
报告人：美国林产品实验室 Junyong Zhu
主办单位：材料科学与工程学院
报告时间：2021年10月11日9：00-11：00
报告形式：Zoom会议（会议ID：865 6365 3747，密码：1011）
腾讯会议（会议ID：303892 158，密码：123567）
报告简介：
Producing bioenergy, biochemicals, and biomaterials from renewable plant biomass can achieve a sustainable future through carbon sequestration and reduced use of fossil hydrocarbons. Developing lignocellulose fractionation processes that are not only sustainable, but also yield easily processable building blocks is the key to commercial success. For the past decade, we have devoted our efforts to advance the science and engineering critical to commercialization of biorefining technologies.
In this presentation, I will report our recent discovery of hydrotropic properties of a recyclable (low solubility) dicarboxylic acid, maleic acid (MA), for potential low-cost and efficient fractionation of lignocelluloses through rapid dissolution of lignin and hemicelluloses at atmospheric pressure. MA hydrotropic fractionation (MAHF) of wood results in two fractions: (i) a primarily cellulose rich water-insoluble solid (WIS) fraction that can be used for the production of high-value building blocks, such as lignocellulosic nanomaterials, fibers, and/or sugars through subsequent enzymatic hydrolysis; and (ii) a spent acid liquor stream containing hemicellulosic sugars and minimally condensed dissolved lignin that can be easily precipitated by simply diluting the spent acid liquor using water to below the minimal hydrotropic concentration. The dissolved hemicelluloses in the spent liquor can be dehydrated into furans using the MA in the spent liquor after lignin precipitation without additional catalysts. MA can then be reconcentrated, recovered, and reused. Nuclear magnetic resonance analyses revealed that MAHF dissolved lignin (MAHL) has a very high content ofb-aryl ether linkages with minimal condensation, which facilitated catalytic conversion into monophenols. The MAHF is carboxylated with light color and therefore is suitable for other applications such as sunblock and skincare products. Carboxylation of the residual lignin in the fractionated WIS enhanced enzymatic saccharification by decreasing nonproductive cellulase binding to lignin, as well as facilitated nanofibrillation of WIS for producing lignin-containing cellulose nanofibrils (LCNFs) to substantially decrease fibrillation energy.
MA is a FDA-approved indirect food additive (21CFR175-177) and can valorize three major lignocellulose components alone, it therefore has significant advantages for biorefinery applications.
报告人简介：
Dr. J.Y. Zhu is a scientific leader at the USDA Forest Products Laboratory, Madison, Wisconsin. Currently, he holds an adjunct appointment at the University of Wisconsin-Madison. He was the inaugural Fulbright-Aalto University Distinguished Chair in Energy and Sustainable Use of Natural Resources (2015-2016), Helsinki, Finland. He has co-authored over 240 peer referred papers and over a dozen of US patents. His work is frequently cited by the broad scientific community with google scholar citations over 16,800 and an h index of 70. His scientific accomplishments were honored with many national and international awards, including AIChE (American Institute of Chemical Engineers) Andrew Chase award in 2016. USDA Undersecretary and US Forest Service Chief’s honor award in 2019, and the Scientific Achievement Award by the International Union of Forest Research Organizations (IUFRO) in 2019. Dr. Zhu is a Fellow of AIChE, TAPPI, and IAWS (International Academy of Wood Science).
Google Scholar Publication List:http://scholar.google.com/citations?hl=en&user=RHy3aEYAAAAJ&view_op=list_works
Research Gate Publication page:https://www.researchgate.net/profile/JY_Zhu/
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