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• The impact of delivery pressure on the design and cost of CO 2 liquefaction is investigated. • Different impurity and purity requirement scenarios are considered. • The CO 2 liquefaction cost decreases significantly with pressure for the range 7–40 bar. • Impurities have a strong impact on design, cost and comparison of the different pressures. • Purity requirements can have a strong impact on the pressure level comparison. As a first step towards identifying the optimal transport conditions for shipping CO 2 , this study investigates the impact of post-liquefaction delivery pressure on the design and cost of CO 2 liquefaction for (a) pure CO 2 (b) three impurity scenarios (c) two purity requirements. For pure CO 2 , the highest liquefaction cost is obtained at 7 bar amongst the range considered (7 to 70 bar), while a minimum lies around 40–50 bar. When different potential impurity scenarios are considered, impurities need to be purged for the low-pressure cases as these are not necessarily soluble in the liquefied CO 2 stream. As a consequence, the liquefaction cost increases significantly for low-pressure cases (up to 34% compared to the pure CO 2), and wider differences between the pressure levels are obtained. Purity requirements also have a significant impact on comparisons of delivery pressures, although this impact depends on both the impurities present and the purity requirement considered. [ABSTRACT FROM AUTHOR]