Method for inhibiting the deposition of ethylene-vinyl alcohol copolymer
AssigneeNalco Chemical Company
InventorMichael K. Poindexter
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Abstract
A method for preventing the precipitation of ethylene-vinyl alcohol copolymers in a distillation vessel. The vessel contains water, methanol, and ethylene-vinyl alcohol copolymers. The method includes the step of adding to the distillation vessel from 1 to about 1,000 ppm of at least one surfactant selected from the group consisting of alkyl, aryl, alkylaryl and arylalkyl sulfonic acids having a carbon length of from 4 to about 30 carbons. Preferably, the surfactant is dodecylbenzenesulfonic acid.
Claims5
A method for preventing the precipitation of ethylene-vinyl alcohol copolymers in a distillation vessel, the vessel containing water, methanol, and ethylene-vinyl alcohol copolymers, the method including the step of adding to the distillation vessel from 1 to about 1,000 ppm of at least one surfactant selected from the group consisting of C4 to C30 alkyl sulfonic acids, C6 to C30 aryl sulfonic acids, C7 to C30 alkyl substituted aryl sulfonic acids, and C7 to C30 aryl substituted alkyl sulfonic acids.
Dependencies are inferred from the claim text.