Acetic acid is one of the promising bio-products following the Value Prior to Pulping (VPP) concept, which is one of the options
for Integrated Forest Biorefinery. In a typical chemi-thermo-mechanical pulping (CTMP) process, the chemical pre-treatment may
be retrofitted into the pre-extraction stage. The potential of pre-extraction of acetic acid under the conditions similar to a CTMP process
was evaluated in this study. The pre-extraction yield of acetic acid increased with the increase of cooking time and temperature. The
maximum acetic acid yield was 31.25% at 150°C and 60 min after the cooking in an M/K digester. The pre-extraction yield increased to
42.05% after the cooked chips were broken down into pulp fibers, indicating that some of the released acetic acid was trapped inside the
wood chips and a post-mechanical treatment could enhance the diffusion of acetic acid to the liquid phase.
Keywords: Acetic acid, CTMP, Forest biorefinery, Pre-extraction, Sulfuric acid, VPP.
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