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Rethinking the inherent moisture content of biomass: Its ability for milling and upgrading Dedy Eka Priyanto, Shun-ichiro Ueno, Hidekazu Kasai, and Kazuhiro Mae ACS Sustainable Chem. Eng., Just Accepted Manuscript • DOI: 10.1021/ acssuschemeng.7b04609 • Publication Date (Web): 30 Jan 2018 Downloaded from http://pubs.acs.org on January 31, 2018
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ACS Sustainable Chemistry & Engineering
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Rethinking the inherent moisture content of biomass: Its ability for milling and upgrading
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Dedy Eka Priyantoa,c*, Shunichiro Uenoa, Hidekazu Kasaib, Kazuhiro Maec
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a
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Yokohama 235-8501, Japan
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b
Engineering Centre, IHI Corporation, Tokyo 135-8710, Japan
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c
Department of Chemical Engineering, Kyoto University, Kyoto 615-8510, Japan
a Chemical Engineering Department, IHI Corporation, 1, Shin-Nakahara-Cho, Isogo-ku,
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* Corresponding author: Dedy Eka Priyanto
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Chemical Engineering Department, IHI Corporation
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1, Shin-Nakahara-Cho, Isogo-ku, Yokohama 235-8501, Japan
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Tel.: +81-45-759-2871, Fax: +81-45-759-2208.
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E-mail address:
[email protected] 15
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Abstract
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The main obstacles to the widespread use of lignocellulosic biomass include its high moisture
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content and low grindability. Thus, we herein report a novel method, viz. the self-steam
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explosion (SE) method, which utilizes the moisture content of biomass to both reduce the
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particle size and enhance it properties. More specifically, the moisture content of the biomass
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sample is fully utilized as a steam resource to auto-hydrolyze the biomass component and yield
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fine particles with diameters < 1 mm through self-explosion. This process differs from
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conventional steam explosion, which mainly employs saturated steam from external resources
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and requires waste water treatment due to contamination of the steam, as the self-SE method
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offers flexibility in terms of the heating resources required in addition to a significant reduction
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in wastewater production. Furthermore, we demonstrated that this self-SE method effectively
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reduced the particle sizes of hardwood, softwood, and agricultural residues measuring 5–10 mm
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to produce fine particles. Moreover, the fine particles obtained by self-SE exhibit higher heating
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values and hydrophobicities than the raw biomass samples, and the proposed method produces
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finer particles and consumes significantly less energy than conventional mechanical milling (i.e.
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cutter milling) processes.
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Keywords : self-steam explosion; milling; upgrading; biomass
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Introduction
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Lignocellulosic biomass, such as woody biomass and agricultural waste, is a promising
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sustainable feedstock for the production of biomaterials, high-value chemicals, and bio-fuels. To
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convert biomass into fine particles (70 wt%) due to the condensation of steam. 22 In addition, this steam cannot be recycled
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without an appropriate wastewater treatment step due to contamination with the liquid product.
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However, this
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Thus, we herein propose a novel SE method, viz. self-steam explosion (self-SE), which
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utilizes the moisture content of biomass itself as a steam feedstock. A significant reduction in
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energy consumption can be expected for this process, as it does not require a pre-drying step or
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additional large volumes of water. Furthermore, this method permits the indirect heating of
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biomass, thereby providing flexibility regarding the heating medium employed (i.e., hot gas or
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steam) while minimizing wastewater production. To confirm the ability of this proposed self-SE
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method to reduce the biomass particle size and upgrade the biomass properties, we conducted
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batch-scale self-SE treatments for 3 types of biomass with moisture contents of 45–75 wt%.
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Ultimately, we aim to produce fine particles measuring
