Life Cycle Greenhouse Gas Emissions of Growing Intermediate Winter Oilseed Feedstocks for Sustainable Aviation Fuel Production
Xinyu Liu, Hao Cai, Michael Wang
Abstract
High Resolution Image Download MS PowerPoint Slide Ensuring an adequate supply of feedstock is a key challenge to achieving a significant production volume of sustainable aviation fuels (SAFs). One promising feedstock for SAFs is intermediate winter oilseeds added to existing crop production as alternatives to the winter fallow period. In this work, three intermediate winter oilseed crops─camelina ( Camelina sativa L. Crantz. ), carinata ( Brassica carinata ), and pennycress ( Thlaspi arvense L. )─are evaluated for their life cycle greenhouse gas (GHG) emissions when harvested and processed into hydroprocessed renewable jet (HRJ). We evaluate solvent extraction (SE) and mechanical pressing as alternative oil extraction methods and examine the impacts of various allocation methods used in the oil extraction process. The GHG emissions reduction potential of camelina-, carinata-, and pennycress-derived HRJs are 50.4%, 65.2%, and 65.7%, respectively, compared to petroleum jet fuel, with SE as an oil extraction method and under mass-based allocation. Combined with the estimated production potential of camelina, carinata, and pennycress as intermediate winter oilseed, 2.5 billion gallons of HRJ can be produced annually, and the total GHG savings could amount to 19.3 million tons when these HRJs replace petroleum jet fuels. In addition, we collect literature information to assess the impacts of these intermediate winter oilseeds on indirect land use change emissions and soil organic carbon sequestration potentials.