Distillation: processes – separatory – With disparate physical separation – Utilizing liquid-liquid extracting of distillation product
Patent
1990-05-21
1992-06-16
Bascomb, Jr., Wilbur
Distillation: processes, separatory
With disparate physical separation
Utilizing liquid-liquid extracting of distillation product
203 45, 203 77, 203 88, 203 92, 568697, 568699, 585802, 585833, 585840, 585867, B01D 334, C07C 710
Patent
active
051222361
ABSTRACT:
A process for removing dimethyl ether (DME) and methanol impurities from C.sub.4 hydrocarbon stream without substantial loss of C.sub.4 hydrocarbons by fractionating a C.sub.4 hydrocarbon stream containing DME and methanol at low levels, e.g., less than 5 wt. % to produce an overhead of about 20 to 40 volume % of the C.sub.4 stream, condensing the overhead, contacting the condensed overhead with about 1 to 5 volumes of water, thereby removing a portion of the DME and methanol from the C.sub.4 stream, returning substantially all of the C.sub.4 stream, except the small amount solubilized in the water, to the fractionation and flashing the solubilized DME and hydrocarbons from the water. The fractionation and extraction are preferably carried out at elevated pressures, e.g., 200 to 300 psig to avoid refrigeration of the overhead condensation. The flashing of the DME and hydrocarbons is carried out by reducing the pressure on the water, e.g. atmospheric pressure at a temperature in the range of 20.degree. C. to 50.degree. C., leaving methanol in the water. The methanol can be removed by distillation or by contacting the methanol containing water stream with a large volume of a C.sub.4 stream whereby a portion of the methanol is extracted in the C.sub.4 stream. The methanol depleted stream can recycle to contact the condensed overhead from the fractionation thereby establishing a closed circuit water wash/methanol recovery system.
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Hearn Dennis
Jones, Jr. Edward M.
Smith, Jr. Lawrence A.
Bascomb, Jr. Wilbur
Johnson Kenneth H.
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