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Description: The liquid-holding capacity of flax shive was characterized compared to three there types of biomass with five different liquids. Flax shive is. essentially a waste product of fibre recovery that is available in large quantities at low cost and has consistent composition and size characteristics. The other biomass materials tested were emp hurd, commercial pine shavings, and the product Simply StrawTM, a flaked commercial absorbent produced primarily from wheat straw. The five liquids tested were distilled water, methanol, anhydrous ethanol, isopropanol, and hexane. All tests used samples with the same particle size at room temperature and atmospheric pressure, with liquid-exposure for one hour followed by draining for one hour. Precautions were included to address the evaporation of volatile liquids and to reduce disturbance of bulk solids, which could potentially alter liquid. retention. Flax shive exhibited comparatively low liquid-holding. capacity across the range of liquids tested. Hemp hurd and commercial pine shavings exhibited good liquid-holding capacity for all liquids, particularly for non-aqueous liquids. The product Simply StrawTM showed variable behaviour. It had the highest liquid-holding capacity for water, but low for all non-aqueous liquids. The results were found to be statistically significant using two-way analysis of variance (ANOVA), with liquid holding capacity affected in order of importance by the type of. liquid selected and then by the biomass material selected. The interaction between the main effects (biomass and liquid) was also significant, most evident with the anomalous behaviour of the product Simply StrawTM. Liquid-holding capacity results correlated most strongly to the liquid properties of surface tension and inverse molar volume. Flax shive was shown to be less desirable as an absorbent, but its behaviour could be beneficial when used as a feedstock for extraction of potential higher-value constituents, reducing losses of solvent agents and products.

Keywords: absorbency, liquid-holding capacity, biomass, flax shive, hemp hurd, pine shavings, wheat straw, simply strawtm, water, methanol, ethanol, isopropanol, hexane.
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Citation: Parsons, R.V. and S. Cenkowski. 2011. Liquid-Holding capacity of flax shive versus other biomass materials using distilled water, alcohols, and hexane. Canadian Biosystems Engineering 53: 3.19-3.27.
Volume: 53
Issue: 3
Pages 3.19 - 3.27
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Date: 2012-07-31
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Coverage: Canada
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