University of Groningen
Biobased furanics from sugars
Soetedjo, Jenny Novianti Muliarahayu
IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below.
Document Version
Publisher's PDF, also known as Version of record
Publication date: 2017
Link to publication in University of Groningen/UMCG research database
Citation for published version (APA):
Soetedjo, J. N. M. (2017). Biobased furanics from sugars. University of Groningen.
Copyright
Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).
Take-down policy
If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum.
Stelingen
Behorende bij het proefschrift Biobased Furanics from Sugars Jenny Novianti Muliarahayu Tan-Soetedjo
1. Humin formation not only involves aldol- and condensation reactions. The catalyst may also be consumed, as indicated by the presence of sulfur in humins when using sulfuric acid as the catalyst (S.K.R. Patil, C.F.R. Lund, Energy Fuels., 2011, 25, 4745-4755; S.K.R. Patil et al., Energy Fuels., 2012, 26, 5281-5293).
2. The use of heterogeneous instead of homogeneous catalysts for the acid catalysed hydrolysis of xylose does not necessarily give lower furfural yields. (K. Yan et al., Renewable Sustainable Energy Rev., 2014, 38, 663–676).
3. Anion effects are often overlooked when studying the mechanism of Bronsted acid catalysed hydrolysis reactions of sugars.
4. It is not always necessary to use high acid concentrations in combination with low temperatures to get the best levulinic acid yields from sugars. Moderate acid concentrations and temperatures may be used when using sucrose as the feed (B.A.Fachri, PhD Thesis, University of Groningen, 2015; B. Girisuta et al., Green Chem., 2006, 8, 701-709).
5. A small reduction in the glucose concentration directly after its formation from sucrose in acid catalyzed hydrolysis experiments indicates the formation of reversion products from glucose, as reported previously by Johnson et al. (H.M. Pilath et al., J. Agric. Food Chem., 2010, 58, 6131).
6. Cross condensation reactions between glucose and fructose are not important in the reaction network for the hydrolysis of sucrose to HMF and LA (J.N.M. Tan-Soetedjo et al., Ind. Eng. Chem. Res., 2017).
7. Alcohol has many useful applications, both during and after working hours. 8. Impossible only means that you have not found the solution yet.
9. You cannot be successful without going through crises. In a period without crisis, we should create one by moving out of our comfort zone.
10. The serious commitment of our government to solve corruption is the biggest trigger for economic growth in Indonesia.
