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European Journal of Wood and Wood Products

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28-03-2023 | Original Article

Dewatering fresh bamboo strips using supercritical carbon dioxide

Authors: Honghai Liu, Zhilan Li, Yu Xie, Jinge Xie

Published in: European Journal of Wood and Wood Products | Issue 5/2023

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Abstract

Rapid drying of bamboo with good quality is a key challenge. Supercritical CO₂ (ScCO₂) dewatering of green wood is fast and creates timber with unique properties due to the removal of water directly from cell lumens as a result of cycling between supercritical and gas phases. To investigate the effect of ScCO₂ on dewatering rate (DR), water transfers and quality of bamboo, fresh moso bamboo (Phyllostachys edulis) strips were dewatered at temperature of 40 and 55 °C, and pressure of 10, 20 and 30 MPa. The results showed that bamboo strips were fast dewatered by ScCO₂ with the DR between 23.8%/h and 63.7%/h. The DR decreased with an increase in sample length. The DR of the 5 mm samples increased with temperature and pressure, whereas a contrary trend was observed for the 30 and 150 mm samples. After dewatering, the moisture content was uniform along the tangential direction of bamboo, but significant moisture gradients were observed along the radial direction, in particular, towards bamboo inner face. Most moisture in bamboo was transferred along the longitudinal direction, while a small amount of water was also removed in the transversal direction, especially along the radial direction toward bamboo inner face. No shrinkage and cracks were observed in the bamboo strips after ScCO₂ dewatering. ScCO₂ dewatering offers a fast and quality solution for bamboo water removal.

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Title: Dewatering fresh bamboo strips using supercritical carbon dioxide
Authors: Honghai Liu
Zhilan Li
Yu Xie
Jinge Xie
Publication date: 28-03-2023
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Wood and Wood Products / Issue 5/2023
Print ISSN: 0018-3768
Electronic ISSN: 1436-736X
DOI: https://doi.org/10.1007/s00107-023-01951-6

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