Separation of organic liquids

Patent · Tue Aug 24 04:00:00 EDT 1993

OSTI ID:6311058

Pasternak, M

The method is described for concentrating a charge solution containing methanol and methyl t-butyl ether which comprises maintaining, as pervaporation membrane, a high molecular weight ion exchange resin bearing a pendant acid group, which resin is characterized by the formula: -(CF[sub 2]CF[sub 2])[sub m]-C(-CF[sub 2]-)FO(CF[sub 2]C(-CF[sub 3])FO)[sub n]CF[sub 2]CF[sub 2]SO[sub 3]-M[sup +] wherein M is a metal, said membrane having been contacted with an aqueous solution sodium chloride; maintaining a pressure drop across said pervaporation membrane; passing a charge solution containing methanol and methyl t-butyl into contact with the high pressure side of said pervaporation membrane whereby at least a portion of said methanol in said charge solution and an lesser portion of said methyl t-butyl ether pass by pervaporation through said pervaporation membrane as a lean mixture containing more methanol and less methyl t-butyl ether than are present in said charge solution and said charge solution is converted to a rich mixture containing less methanol and more methyl t-butyl ether than are present in said charge solution; recovering as permeate from the low pressure side of said pervaporation membrane said lean mixture containing a lower methanol content and a higher methyl t-butyl ether content than are present in said charge solution; recovering as retentate from the high pressure side of said pervaporation membrane said rich mixture containing less methanol and more methyl t-butyl ether than are present in said charge solution, said method enabling attainment of a balance between separation factor and flux.

• Assignee: Texaco Inc., White Plains, NY (United States)
• Patent Number(s): A; US 5238573
• Application Number: PPN: US 7-865536
• OSTI ID: 6311058
• Country of Publication: United States
• Language: English

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ALKALI METAL COMPOUNDS
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ETHERS
FUEL ADDITIVES
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HALOGEN COMPOUNDS
HYDROXY COMPOUNDS
ION EXCHANGE MATERIALS
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SODIUM CHLORIDES
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