The designed CST fractionation model includes two distillation columns for desulphurization, two for α-pinene recovery and three for β-pinene recovery. A detailed process model description is provided in Section 2.3. Simulations of the fractionation train show successful separation of CST into sulphurous waste and three desulphurised terpene fractions (sulphurous compound contents < 5 ppm), including the β-pinene product stream (95 wt.% β- pinene), an α-pinene stream (95 wt.% a-pinene), and a carene-dominant mixed terpene stream (69 wt.% carene). Further purification of the terpene streams was not modelled.