On the Effect of Hot-Water Pretreatment in Sulfur-Free Pulping of Aspen and Wheat Straw

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Hyväkkö , U , Maltari , R , Kakko , T , Kontro , J , Mikkilä , J , Kilpeläinen , P , Enqvist , E , Tikka , P , Hilden , K , Nousiainen , P & Sipilä , J 2020 , ' On the Effect of Hot-Water Pretreatment in Sulfur-Free Pulping of Aspen and Wheat Straw ' , ACS Omega , vol. 5 , no. 1 , pp. 265-273 . https://doi.org/10.1021/acsomega.9b02619

Title: On the Effect of Hot-Water Pretreatment in Sulfur-Free Pulping of Aspen and Wheat Straw
Author: Hyväkkö, Uula; Maltari, Riku; Kakko, Tia; Kontro, Jussi; Mikkilä, Joona; Kilpeläinen, Petri; Enqvist, Eric; Tikka, Panu; Hilden, Kristiina; Nousiainen, Paula; Sipilä, Jussi
Other contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Microbiology
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Microbiology
University of Helsinki, Fungal Genetics and Biotechnology
University of Helsinki, Department of Chemistry
University of Helsinki, Jussi Sipilä / Principal Investigator



Date: 2020-01-14
Language: eng
Number of pages: 9
Belongs to series: ACS Omega
ISSN: 2470-1343
DOI: https://doi.org/10.1021/acsomega.9b02619
URI: http://hdl.handle.net/10138/309552
Abstract: In modern biorefineries, low value lignin and hemicellulose fractions are produced as side streams. New extraction methods for their purification are needed in order to utilize the whole biomass more efficiently and to produce special target products. In several new applications using plant based biomaterials, the native-type chemical and polymeric properties are desired. Especially, production of high-quality native-type lignin enables valorization of biomass entirely, thus making novel processes sustainable and economically viable. To investigate sulfur-free possibilities for so-called "lignin first" technologies, we compared alkaline organosolv, formic acid organosolv, and ionic liquid processes to simple soda "cooking" using wheat straw and aspen as raw materials. All experiments were carried out using microwave-assisted pulping approach toy enable rapid heat transfer and convenient control of temperature and pressure. The main target was to evaluate the advantage of a brief hot water extraction as a pretreatment for the pulping process. Most of these novel pulping methods resulted in high-quality lignin, which may be valorized more diversely than kraft lignin. Lignin fractions were thoroughly analyzed with NMR (C-13 and HSQC) and gel permeation chromatography to study the quality of the collected lignin. The cellulose fractions were analyzed by determining their lignin contents and carbohydrate profiles for further utilization in cellulose-based products or biofuels.
Subject: 116 Chemical sciences
XYLAN DERIVATIVES
IONIC LIQUID
EXTRACTION
LIGNIN
BIOMASS
BIOREFINERY
HEMICELLULOSES
ALKALI
DEPOLYMERIZATION
FRACTIONATION
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