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Advisor(s)
Abstract(s)
The aim of this manuscript is to present an integrated process that includes reaction and separation steps for
producing vanillin and lignin-based polyurethanes from Kraft lignin. It provides details about lignin oxidation and
subsequent vanillin recovery, as well as, the synthesis of lignin-based polyurethanes. The oxidation of Kraft lignin in
alkaline medium has been carried out in a batch reactor and the optimum operational conditions for vanillin production
obtained. The feasibility of a continuous process for vanillin production has been analyzed using a structured
bubble column reactor. The generated reaction stream (degraded lignin and sodium vanillate) was further subjected
to an ultrafiltration process to recover the vanillate. An ion-exchange process allows recovering the vanillin by passing
the vanillate solution through a column packed with an ion-exchange resin in H+ form. The remaining lignin can
act as a raw material to produce polyurethanes and/or biofuels. In this work the first approach was explored.
Description
Keywords
Kraft lignin Vanillin Polyurethanes Oxidation Ultrafiltration Integrated process
Citation
Silva, E.A.B. da; Zabkova, M.; Araújo, J.D.; Cateto, C.A.; Barreiro, M.F.; Belgacem, M.N.; Rodrigues, A.E. (2009). An integrated process to produce vanillin and lignin-based polyurethanes from Kraft lignin. Chemical Engineering Research and Design. ISSN 0263-8762. 87:9, p. 1276-1292
Publisher
Elsevier