期刊
CHEMICAL ENGINEERING RESEARCH & DESIGN
卷 87, 期 9A, 页码 1276-1292出版社
ELSEVIER
DOI: 10.1016/j.cherd.2009.05.008
关键词
Kraft lignin; Vanillin; Polyurethanes; Oxidation; Ultrafiltration; Integrated process
资金
- [POCTI/EQU/33198/99]
- [POCI/EQU/61738/2004]
- [CYTED IV.17/2002-2006]
- [ACCAO LUSO-FRANCESA F13/06]
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. (C) 2009 The Institution of Chemical Engineers. Published by Elsevier B.V All rights reserved.
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