Co-cast thin film composite flat sheet membranes for gas separations and olefin/paraffin separations
OwnerChunqing Liu, Carl W. Liskey +1inventors
InventorsChunqing Liu, Carl W. Liskey, Nicole K. Karns
Life of this patent
Estimating the term…
Abstract
A co-cast thin film composite flat sheet membrane is provided that comprises an asymmetric porous non-selective support layer with a thickness of 10-50 micrometers and an asymmetric integrally skinned polyimide-containing selective layer with a thickness of 5-40 micrometers on top of said support layer, wherein said asymmetric integrally skinned polyimide-containing selective layer comprises a porous non-selective polyimide-containing support layer with a thickness of ˜5-40 micrometers and a relatively porous, thin, dense, polyimide-containing top skin layer with a thickness of 0.02-0.2 micrometers.
Claims10
A co-cast thin film composite flat sheet membrane comprising an asymmetric porous non-selective support layer and an asymmetric integrally skinned polyimide-containing selective layer on top of said asymmetric porous non-selective support layer wherein said asymmetric porous non-selective support layer comprises a non-polyimide polymer or a mixture of a non-polyimide polymer and a polyimide polymer, wherein on top of said asymmetric integrally skinned polyimide-containing selective layer is a hydrophobic fluoropolymer layer and wherein said asymmetric integrally skinned polyimide-containing selective layer is cross-linked under UV radiation and wherein the weight ratio of said non-polyimide polymer to said polyimide polymer in said mixture is in a range of 20:1 to 2:1.
A co-cast thin film composite flat sheet membrane comprising:
- an asymmetric porous non-selective support layer;
- an asymmetric integrally skinned polyimide-containing selective layer on top of said asymmetric porous non-selective support layer;
- a hydrophilic polymer layer is on top of said asymmetric integrally skinned polyimide-containing selective layer and;
- a metal salt inside pores on said asymmetric integrally skinned polyimide-containing top skin layer;
- wherein said asymmetric porous non-selective support layer comprises a non-polyimide polymer or a mixture of a non-polyimide polymer and a polyimide polymer;
- and
- wherein the weight ratio of said non-polyimide polymer to said polyimide polymer in said mixture is in a range of 20:1 to 2:1.
Dependencies are inferred from the claim text.