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Study to the characteristics of HMF autoxidation with a Co/Mn/Br catalyst

Janssens, H.M.M. (2015) Study to the characteristics of HMF autoxidation with a Co/Mn/Br catalyst. Master's Thesis / Essay, Chemistry.

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In this research the characteristics of the autoxidation reaction of HMF in acetic acid with a homogeneous Co/Mn/Br catalyst and acetaldehyde as initiator were explored. The aim was to investigate its potential to be intensified using a capillary microreactor. Three important topics in current green chemistry field are in that way addressed: HMF is a highly valued platform chemical that can readily be produced from biomass. Homogeneous catalysis is considered to be very promising for biomass conversion and the highly efficient microreaction technology is a sustainable engineering tool for process intensification. The behaviour of the reaction was primarily investigated in a semi-batch reactor (SB) at atmospheric pressure and in an autoclave (A) at high pressure. These results were compared to data obtained from preliminary experiments in the capillary microreactor (M). The parameters that were varied in the performed reactions were acetaldehyde (A, SB), catalyst (SB) and HMF concentration (SB), temperature (A, M, SB), pressure (A) and flow rate (M, SB). Although the reaction rate was not assumed to be limited by oxygen mass transfer, experimental data showed the contrary. If oxygen supply is low, the reaction rate is limited by mass transfer and the reaction is suitable for process intensification. The performance of the reaction was enhanced upon operation in a microreactor: for similar reaction time and conditions the DFF and FFCA yield showed an increase of respectively 34% and 94% at medium temperature (70°C), compared to the semi-batch reactor. Compared to the autoclave, operated at higher pressure and furthermore similar conditions, this increase was even 328% and 578%, respectively.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Chemistry
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 08:09
Last Modified: 15 Feb 2018 08:09

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