Catalytic Effects of MgSO4 and ZnCl2 On Fast Pyrolysis of Pine for the Production of Bio-Oils | AIChE

Catalytic Effects of MgSO4 and ZnCl2 On Fast Pyrolysis of Pine for the Production of Bio-Oils


Conference Presentation

Conference Type

AIChE Annual Meeting

Presentation Date

November 6, 2013


15 minutes

Skill Level




The effects of MgSO4 and ZnCl2 as catalysts on fast pyrolysis of pine were investigated in a bench-scale bubbling fluidized bed reactor. The study showed that both MgSO4 and ZnCl2 could shift the pyrolysis of pine to a lower temperature zone , that is , most of pyrolytic reactions for cellulose and hemicellulose would happen at lower temperature while lignin at higher temperature , which results in different composition of bio-oils from that without adding any of these two salts. Compared to the bio-oils obtained without catalysts (base case) , glucopyranose in bio-oils was increased to 20.69 % from less than 1% (base case) when 20 wt% of MgSO4 was added; while ketones decreased from 26.71 % (base case) to 8.41 % , 2-Propanone , 1-hydroxy from 9.94 % (base case) to 0.62 %. When 30 wt% of ZnCl2 is added , glucopyranose in bio-oils hiked to 20.21 % from less than 1% (base case); while phenols reduced to 6.25% from 27.09 % (base case). The pH of bio-oils rises whether MgSO4 or ZnCl2 was added. This study suggests that by adding specific salts into biomass , the composition of bio-oils obtained from fast pyrolysis can be of greatly different. Therefore , we can increase the content of certain chemicals in bio-oils on purpose , which could make the extraction of value-added chemicals from bio-oils more feasible and economical.


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