Chemical Recovery of γ-Valerolactone/Water Biorefinery

Huy Quang Lê, Juha Pekka Pokki, Marc Borrega, Petri Uusi-Kyyny, Ville Alopaeus, Herbert Sixta (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    Abstract

    We introduce the optimization of the pulping conditions and propose different chemical recovery options for a proven biorefinery concept based on γ-valerolactone (GVL)/water fractionation. The pulping process has been optimized whereby the liquor-to-wood (L:W) ratio could be reduced to 3 L/kg without compromising the pulp properties as raw material for textile fibers production. The recovery of the pulping solvent was performed through combinations of lignin precipitation by water addition, distillation at reduced pressure, and liquid CO2 extraction. With a two-step lignin precipitation coupled with vacuum distillation, more than 90% of lignin and GVL could be recovered from the spent liquor. However, a significant part of GVL remained unrecoverable in the residue, which was a highly viscous liquid with complicated phase behavior. The recovery by lignin precipitation combined with liquid CO2 extraction could recover more than 85% GVL and 90% lignin without forming any problematic residue as in the distillation process. The remaining GVL remained in the raffinate containing a low amount of lignin and other compounds, which can be further processed to isolate the GVL and improve the recovery rate.

    Original languageEnglish
    Pages (from-to)15147–15158
    Number of pages12
    JournalIndustrial and Engineering Chemistry Research
    Volume57
    Issue number44
    DOIs
    Publication statusPublished - 18 Oct 2018
    MoE publication typeNot Eligible

    Keywords

    • carbon dioxide
    • distillation
    • lignin
    • liquids
    • recovery
    • refining
    • chemical recovery
    • pulp properties

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