Wytze Meindersma - Conceptual process design for aromatic/aliphatic separation with ionic liquids, Chem. Eng. Res. Des., 86, 745-752, (2008)G

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  G.W. Meindersma, A.B. de Haan, Conceptual process design for   aromatic/aliphatic separation with ionic liquids, Chem. Eng. Res.   Des., 86, 745-752, (2008),   http://dx.doi.org/10.1016/j.cherd.2008.02.016


  Presently, there are no processes available to separate low   concentration (<20%) aromatic hydrocarbons from mixed aromatic   aliphatic hydrocarbon streams, such as a feed stream to naphtha   crackers, which may contain 10-25% of aromatic components,   depending on the source of the feed (naphtha or gas condensate).   Present practice is removal of the aromatic hydrocarbons from the   C5+-stream in the naphtha ******* by extractive or azeotropic   distillation. If a major part of the aromatic compounds present   in the feed to the crackers could be separated upstream of the   furnaces, it would offer several advantages: higher capacity,   higher thermal efficiency and less fouling. The improved margin   will be around [euro]20/t of feed or [euro]48 million per year   for a naphtha ******* with a feed capacity of 300 t/h, due to   lower operational costs. Extraction with sulfolane will result in   a negative margin of [euro]10 million per year. Therefore, a   conceptual process for the extraction of aromatic hydrocarbons   with the ionic liquid 4-methyl-N-butylpyridinium   tetrafluoroborate was developed using ASPEN. The investment costs   are estimated to be [euro]56 million and the annual costs about   [euro]28 million per year, resulting in a positive margin of   about [euro]20 million per year.

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