Thin film composite membrane prepared by deposition from a solution
US4837054A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1987 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Oct 14, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/54
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.