Rethinking the Inherent Moisture Content of Biomass: Its Ability for

Jan 30, 2018 - Thus, we herein report a novel method, viz., the self-steam explosion (SE) method, which utilizes the moisture content of biomass to bo...
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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]

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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