4.5 Article

Pressurized hot water extraction of Scots pine sapwood: effect of wood size on obtained treatment products

期刊

BIOMASS CONVERSION AND BIOREFINERY
卷 12, 期 11, 页码 5019-5029

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s13399-020-00927-3

关键词

Chemical composition; Hemicellulose extraction; Hydrolysis; Treatment severity; Wood degradation

资金

  1. Aalto University
  2. Academy of Finland [309881]
  3. South Savo Regional Council of the European Regional Development Fund [A7389]
  4. Academy of Finland (AKA) [309881] Funding Source: Academy of Finland (AKA)

向作者/读者索取更多资源

The size of wood affects the efficiency of hot water extraction, with smaller samples resulting in greater mass loss due to difficulties in diffusion and mass transfer. Additionally, the size of wood also influences the amount of dissolved compounds in the extraction liquid.
The efficiency of hot water extraction (HWE) is dependent on the size of treated wood. While previous research regarding this size-effect has focused on HWE treating sawdust and wood chips, this study investigated its effect on wood blocks with precise dimensions and a broad range of treatment conditions. Scots pine (Pinus sylvestrisL.) sapwood samples with dimensions of 10 x 10 x 20 mm(3)and 25 x 25 x 50 mm(3)(R x T x L) were HWE treated at 130-170 degrees C for 40-200 min using liquid-to-solid ratios of 4-20. Our results showed that wood mass loss, which was primarily caused by the decomposition of hemicelluloses, was larger when using small samples. This was mainly assigned to a higher quantity of acetone-soluble decomposition products that remained within the large samples, due to longer distances for diffusion and mass transfer from the wood blocks to the extraction liquid. In line with wood mass loss differences, the amount of dissolved compounds (i.e., carbohydrates) in the extraction liquid at different treatment severities was dependent on the wood size, while the liquid-to-solid ratio had only modest effects. However, composition changes of the extraction liquid, in particular changes in the proportion of poly- and monocarbohydrates with increasing treatment severity, were similar for both sample sizes.

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