The results show that the environmental performance of β-pinene feedstock compared to benzene is strongly dependent on the method of allocation employed for the β-pinene production process. If the impacts of CST separation are entirely allocated to the β-pinene product stream (allocation scenario 1), then benzene outperforms β-pinene significantly across all LCIA categories, as reflected in columns 1 and 2 of Figure . However, β-pinene is arguably not the only product obtained from the CST separation system, as 43 kg of α-pinene (95 wt.%) and 12 kg of desulphurised mixed terpenes (69 wt.% carene) are produced per kg of β-pinene. Consequentially, CST separation may be considered a multi-product system, where impacts are allocated amongst several system outputs, which yields a different and improved environmental performance result for β-pinene production from CST.