Separation of organic liquids

Patent · Tue Jan 17 04:00:00 EST 1989

OSTI ID:6054404

Pasternak, M; Bartels, C R; Reale, J Jr

The method is described comprising: concentrating a charge solution containing methanol and either dimethyl carbonate or methyl t-butyl ether oxygenate by, maintaining a membrane of non-porous separating layer of cast polyvinyl alcohol which has been crosslinked with an aliphatic polyaldehyde containing at least three carbon atoms including those in the aldehyde groups; maintaining a pressure drop across the non-porous separating layer of polyvinyl alcohol; passing a charge aqueous solution containing methanol and either dimethyl carbonate or methyl t-butyl ether oxygenate into contact with the high pressure side of the non-porous separating layer of polyvinyl alcohol having properties which enable at least a portion of the methanol in the charge solution and a lesser portion of oxygenate to pass by pervaporation through the non-porous separating layer of polyvinyl alcohol as a lean mixture containing more methanol and less oxygenate than are present in the charge solution and the charge solution is converted to a rich liquid containing less methanol and more oxygenate than are present in the charge solution; recovering as permeate from the low pressure side of the non-porous separating layer of polyvinyl alcohol the lean mixture containing more methanol and less oxygenate than are present in the charge solution, the lean mixture being recovered in vapor phase at a pressure below the vapor pressure thereof; and recovering as retentate from the high pressure side of the non-porous separating layer the rich liquid containing a lower methanol content and a higher oxygenate content than are present in the charge solution.

• Assignee: Texaco Inc., White Plains, NY
• Patent Number(s): US 4798674
• OSTI ID: 6054404
• Country of Publication: United States
• Language: English

Related Subjects

090221* -- Alcohol Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ALCOHOLS
ALDEHYDES
ALKYL RADICALS
AQUEOUS SOLUTIONS
BUTYL RADICALS
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
CROSS-LINKING
DISPERSIONS
ETHERS
HYDROXY COMPOUNDS
METHANOL
METHYL RADICALS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLYMERIZATION
POLYMERS
POLYVINYLS
RADICALS
SEPARATION PROCESSES
SOLUTIONS