Publication Details (including relevant citation information):
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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