Thin film composite membrane prepared by deposition from a solut

Details Thin film composite membrane prepared by deposition from a solut Thin film composite membrane prepared by deposition from a solut

1989-02-09

1990-05-01

Sever, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210654, 21050037, B01D 1300

Patent

active

049216112

ABSTRACT:
Thin film composite membranes comprising a thin active selective layer deposited from a solution onto a thicker porous non-selective support layer are disclosed. In particular, a thin film of polyurea/urethane is coated onto a microporous support substrate from a specific multi-component solvent system. Effective film thicknesses of less than 1 micron can be achieved, said thin films being virtually defect free. Asymmetric-composite membranes consisting of a thin active layer of polyurea/urethane on a microporous support substrate are useful for separating aromatics from saturates, especially under pervaporation or perstraction conditions.

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