Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 239, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.116551
Keywords
Biorefinery; Lignin depolymerization; Vanillin; Added-value compounds; Indulin AT
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Funding
- NORTE2020 through PT2020 [NORTE-01-0145-FEDER-000006]
- NORTE2020 through ERDF [NORTE-01-0145-FEDER-000006]
- FCT/MCTES (PIDDAC) [LSRE-LCM - UID/EQU/50020/2019]
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In the concept of biorefineries, the production of added-value compounds from kraft lignin depolymerization is still hindered by the number of separation processes needed to purify the phenolic compounds. In this work, a sequence of oxidation, membrane filtration and chromatographic separation is proposed for the recovery of vanillin. The alkaline wet oxidation achieved a vanillin yield of 4.3% on lignin weight basis. The two-step membrane filtration reduced the initial organic load to 29.5 (+/- 1.8) g/L in the final permeate. The chromatographic step enriches solutions containing vanillin by alternating the feed phase with desorption utilizing only deionized water. In 22 cycles, 71% of the vanillin fed is recovered with at an average 1.5 g/cycle. Recovered fraction has a vanillin concentration of 4.7 g/L which can be further concentrated. This presents a major breakthrough for vanillin production from oxidized softwood lignin as it simplifies the purification procedure, reducing costs with desorption solvents and avoiding acid use.
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