B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
202/77
B01D 3/40 (2006.01) C07C 7/10 (2006.01) C10G 21/00 (2006.01)
Patent
CA 1055876
IMPROVEMENT IN A PROCESS FOR THE SEPARATION OF AROMATIC HYDROCARBONS FROM A MIXED HYDROCARBON FEEDSTOCK ABSTRACT OF THE DISCLOSURE A process for the recovery of aromatic hydrocarbons having boiling points in the range of about 80°C to about 175°C from mixtures with aliphatic hydrocarbons comprising the following steps: (a) contacting the feed-stock in an extraction zone with a mixture of water and a water-miscible organic solvent, said solvent having a boiling point of at least about 200°C, and with reflux hydrocarbons at a temperature between about 100°C and about 200°C and a pressure of about 6 to about 14.5 atmospheres to provide an extract comprising aromatic hydro- carbons, solvent and water as well as a raffinate comprising aliphatic hydrocarbons; (b) separating the extract in a distillation zone with flash and fractionation, the fractionation utilizing steam, into an overhead distillate comprising a hydrocarbons phase and a water phase and furthermore bottoms comprising a mixture of solvent and water; (c) recycling the hydrocarbons phase of the overhead distillate and the bottoms of step (b) to the extraction zone; (d) washing all or part of the water phase of the overhead distillate with a slip stream of aromatic compounds, which comprises at least 95 percent by weight of aromatic hydrocarbons, the amount of the -1- slip stream being about 0.1 to 5 percent by weight, based on the total weight of the aromatic hydro- carbons in the feedstock, to provide an aromatic hydrocarbons phase and a water phase; and (e) washing the aromatics phase of the side stream of aromatics compounds with the water phase produced in step (d), characterized in that the raffinate is washed with process water to provide a raffinate aliphatic hydrocarbons phase and one or more solvent containing raffinate water phases, and the raffinate water phases are recycled to the extrac- tion zone at about the midpoint thereof. S P E C I F I C A T I O N 1(a)
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