467990 An Investigation on Short Residence Time Macro Algae Hydro Thermal Liquefaction in a Batch Reactor

Sunday, November 13, 2016: 4:10 PM
Franciscan B (Hilton San Francisco Union Square)
Arash Izadpanah, Niccolo Le Brun and Klaus Hellgardt, Department of Chemical Engineering, Imperial College London, London, United Kingdom

AIChE annual meeting, November 2016 San Francisco


An investigation on short residence time macro algae hydro thermal liquefaction in a batch reactor

Arash Izadpanah a, Niccol˜ Le Brun a, Klaus Hellgardta

a Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom


Bio crude oil production from macro algae may become a key technology to tackle tomorrowÕs renewable fuels challenge. In order to seed this technology it is important to identify and evaluate the right process pathways to convert macro algae to biofuels. In conventional algal biofuels processing, drying of the algae is a costly procedure, which could be bypassed by using Hydrothermal Liquefaction (HTL) technology with substantial advantages. For an efficient implementation of a continuous HTL process, the effect of process variables on the conversion and selectivity towards liquid biofuels needs to be understood. This is often a challenge because the timescale of the HTL process is of the order of minutes and it is difficult to be captured properly by ordinary methods. In this study we employed a molten salt bath to facilitate rapid heat transfer to the batch reactor and thus study HTL for precisely controlled residence times between 1 and 25 min. Under experimental conditions the conversion of macro algae to bio crude oil was found to be complete within 15 min reaching a maximum and then decreasing slightly (23% maximum yield after 11 min at 390 ¡C). Using different analytical techniques including CHNS-O, GC-MS, Simulated Distillation and Size Exclusion chromatography the bio crude from macro algae is characterized and compared with North Sea crude oil.

Keywords: Macro algae, Hydrothermal liquefaction, Conversion rate, Filtration, Centrifugation


Figure 1:Graphical summery of the experiment


Figure 2: Bio crude oil yield as a function of residence time at 250 , 320 , 390 .

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