报告题目：Tailoring Lignin Properties for Lignin First Biorefinery using Low Temperature (≤ 90 °C) Hydrotrope Chemistry（在木质素优先的生物精炼中用低温(≤90℃)助溶化学法调控木质素的性质）
报 告 人：Prof. J.Y. Zhu
USDA Forest Service, Forest Products Laboratory, Madison, WI, USA
Dept. of Biological Systems Engineering, University of Wisconsin-Madison
报告时间：2018年6月6日（星期三）下午15：00
报告地点：逸夫工程馆4楼会议室
欢迎广大师生参加！
化学与化工学院
2018-05-30
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 200 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 8800 and an h index of 50.His scientific accomplishments were honored with US Forest Service R&D Distinguished Science Award in 2013, TAPPI (Technical Association of Pulp and Paper Industry) International R&D Technical Award and William H. Aiken Prize in 2014, and AIChE (American Institute of Chemical Engineers) Andrew Chase award in 2016. Dr. Zhu is a Fellow of AIChE, TAPPI, and IAWS (International Academy of Wood Science).
报告摘要：
In this presentation, I will outline our past research work in the productions of biojet fuel and cellulose nanomaterials. I will also report our recent discovery of the hydrotropic properties of a recyclable aromatic acid, p-toluenesulfonic acid (p-TsOH) for potential low-cost and efficient fractionation of lignocelluloses. Specifically, I will focus on tailoring lignin properties for lignin first biorefinery using this low temperature (≤ 90 °C) hydrotrope chemistry. p-TsOH fractionated wood into two fractions: (i) a primarily cellulose rich water-insoluble solid fraction that can be used for the production of high-value building blocks, such as lignocellulosic nanomaterials, dissolving pulp fibers; and (ii) a spent acid liquor stream containing mainly dissolved lignin that can be easily precipitated as lignin nanoparticles by diluting the spent acid liquor using water to below the minimal hydrotrope concentration. Hemicelluloses in the spent liquor were mainly in the form of xylose that can be dehydrated into furfural using the p-TsOH in the spent liquor after lignin precipitation without additional catalysts. By adjusting the fractionation severity, we were able to produce lignin with unique optical properties, suitable for cosmetic, and dispersant for dyes. We were also able to obtain lignin with desired chemical structure and molecular weight distributions, for example, producing lignin with similar properties as mill wood lignin containing high β-O-4 linkages and large molecular weight.p-TsOH has a relatively low water solubility, which can facilitate efficient recovery using commercially proven crystallization technology by cooling the concentrated spent acid solution to ambient temperatures to achieve environmental sustainability through recycling of p-TsOH.