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By Duane W.

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43 kPa (feed stage pressure). Sulfolane and three ILs were used as extractive solvents: 4-methyl-N-butylpyridinium tetracyanoborate ([4-mebupy][B(CN)4]), [4mebupy][BF4], and [emim][SCN]. The conceptual design study should determine whether the use of ILs is beneficial compared to the benchmark solvent sulfolane, and whether it is more efficient to have an IL with a higher selectivity and lower capacity, or an IL with lower selectivity and higher capacity. The feed entered the extractive distillation column in all processes as a saturated liquid.

2 Crude Oil Processing Many stages are developed from extracting crude oil from a well to obtaining an everyday product. They can be classified as follows [1]: • Exploration: searching for potential oil fields. • Upstream: production and stabilisation of oil. This stage includes the separations carried out in the field, near the well, to remove the gases, water and dirt that accompany crude oil coming from the reservoir. • Midstream: transportation and storage of crude oil. • Refining: downstream processes accomplished in the refinery to transform crude oil into marketable products.

2 Crude Oil Processing Many stages are developed from extracting crude oil from a well to obtaining an everyday product. They can be classified as follows [1]: • Exploration: searching for potential oil fields. • Upstream: production and stabilisation of oil. This stage includes the separations carried out in the field, near the well, to remove the gases, water and dirt that accompany crude oil coming from the reservoir. • Midstream: transportation and storage of crude oil. • Refining: downstream processes accomplished in the refinery to transform crude oil into marketable products.

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