Abstract
A thermochemical processing route from biomass residues to light olefins (ethylene and propylene) is assessed by means of process simulation and cost analysis. A two-step process chain is proposed where (1) biomass residues are first converted to synthetic methanol in a gasification plant situated close to feedstock resources and (2) the produced methanol is transported to a steam cracking site where it is further converted in a methanol to olefins (MTO) plant. Possibilities for heat and product integration as well as equipment sharing with a steam cracking plant are discussed. Overall mass yields from dry biomass to light olefins range from 169 to 203 kg/t. Based on cursory capital cost estimates, the maximum methanol purchase price for such integrated MTO plants is estimated to be in the range of 420–450 €/t.
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Notes
1 These include Shenhua Baotou’s methanol to olefins (300 kt/a ethylene and 300 kt/a propylene) and Shenhua Ningmei’s methanol to propylene (500 kt/a propylene) [4].
2 The PDU was run circa 4,000 h in pressurised oxygen-blown mode using various wood residues as feedstock.
3 The heat of combustion is defined on lower heating value basis and calculated for the wet biomass prior drying.
4 Higher costs are due to more expensive double fluidised-bed reactor/regenerator system, reactor internals, catalyst and combustion air blower.
5 Following breakdown is assumed for the O&M: personnel costs 0.5 %, maintenance & insurances 2.5 %, catalysts & chemicals 1 %.
6 The C 4+ is valued at 80 % of the end-product value, which we assume to be 750 €/t for conventional motor fuel and 1,269 €/t for biofuel
7 Both plants having 10 % internal rate on return and paying 12 €/MWh for the feedstock
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Acknowledgments
The authors thank Lotta Sorsamäki, Ali Harlin and Kai Sipilä for helpful discussions during the preparation of this paper, Tom Kreutz (Princeton university) for helpful reviews of an early MTO simulation model and Eric Larson (PU) for assistance with early cost analysis. The research leading to these results was funded by VTT Technical Research Centre of Finland.
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Hannula, I., Arpiainen, V. Light olefins and transport fuels from biomass residues via synthetic methanol: performance and cost analysis. Biomass Conv. Bioref. 5, 63–74 (2015). https://doi.org/10.1007/s13399-014-0123-9
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DOI: https://doi.org/10.1007/s13399-014-0123-9