Journal article Open Access

The effect of using different acids to catalyze the prehydrolysis stage on the organosolv delignification of beech wood in two-stage process

Qusay . Ibrahim; Pablo .J. Arauzo; Andrea Kruse


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    <subfield code="a">&lt;p&gt;In this study, beechwood was fractionated in lab-scale rector by one-stage and two-stage processes. The two-stage processes of the prehydrolysis with no catalyst (only water) and catalyst (sulfuric, phosphoric, oxalic acids), and the subsequent effect on the organosolv process were studied. A one-stage organosolv delignification of beech wood (control experiment) was conducted at 155 &amp;ordm;C for 160 min in 1:1 ethanol/water mixture with 100 mM sulfuric acid, while the two-stage processes were conducted starting from the uncatalyzed and catalyzed (20-200 mM) prehydrolysis of beech wood at 175 &amp;ordm;C for 60 min. The results indicate that sulfuric acid enhanced the removal of xylan from beechwood during the prehydrolysis stage. Moreover, the effectiveness of the delignification of beech wood using a one-stage process is more than the two-stage, as well as the enzymatic digestibility of the pulp, which was better than those of the two-stage processes. However, the enzymatic digestibility results of the pulp obtained after sulfuric acid-catalyzed prehydrolysis followed by organosolv delignification shown better results than the other two-stage processes. Additionally, high klason content, low sugar content, low M&lt;sub&gt;w&lt;/sub&gt;, and high phenolic hydroxyl groups of lignin was recovered by a one-stage organosolv delignification.&lt;/p&gt;</subfield>
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    <subfield code="u">University of Hohenheim</subfield>
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