A new technique for cellulose nanocrystal (CNC) production based on hydrolysis with hydrogen chloride vapor is introduced. We further developed the existing technique based on HCl vapor pressure with a reactor that can be applied to the degradation of cellulose with pressurized HCl (99.8 %) gas. Levelling-off degree of polymerization (LOPD) level of cellulose cotton linter filter papers is now reached with less than 2 h reaction time, which is significantly shorter than the overnight reaction required with HCl vapor. Additionally, the reaction kinetics of the degradation of an industrial dissolving pulp was studied with pressurized HCl gas. This technique is a promising candidate for large scale production of CNCs with high yields, minimal water consumption, and short reaction times. Furthermore, recycling of the gas is effortless because it spontaneously desorbs from the fibers after being removed from the HCl atmosphere.

From vapour to gas: Optimising cellulose degradation with gaseous HCl

255th National Meeting (2018)

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