Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1989-06-27
1991-07-09
Spear, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
21050037, B01D 6136
Patent
active
050303554
ABSTRACT:
Thin film membranes of polyurea, polyureapolyurethane alloy, polyurea-polyurea/urethane alloy or polyurea/urethane are prepared by deposition of a thin film of suspension of the selected polymer on a thick permeable support layer by the technique of preparing a suspension of the selected polymer in a solvent which does not dissolve the thick permeable support layer and permitting the solvent to evaporate and/or permeate through the thick-permeable layer.
REFERENCES:
patent: 4879044 (1989-11-01), Feimer et al.
Allocca Joseph J.
Exxon Research & Engineering Company
Spear Frank
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