Anisotropic membranes for gas separation
- Newton, MA
A gas separation membrane has a dense separating layer about 10,000 Angstroms or less thick and a porous support layer 10 to 400 microns thick that is an integral unit with gradually and continuously decreasing pore size from the base of the support layer to the surface of the thin separating layer and is made from a casting solution comprising ethyl cellulose and ethyl cellulose-based blends, typically greater than 47.5 ethoxyl content ethyl cellulose blended with compatible second polymers, such as nitrocellulose. The polymer content of the casting solution is from about 10% to about 35% by weight of the total solution with up to about 50% of this polymer weight a compatible second polymer to the ethyl cellulose in a volatile solvent such as isopropanol, methylacetate, methanol, ethanol, and acetone. Typical nonsolvents for the casting solutions include water and formamide. The casting solution is cast in air from about zero to 10 seconds to allow the volatile solvent to evaporate and then quenched in a coagulation bath, typically water, at a temperature of 7.degree.-25.degree. C. and then air dried at ambient temperature, typically 10.degree.-30.degree. C.
- Research Organization:
- A/G Technology Corp
- DOE Contract Number:
- AC07-83ID12429
- Assignee:
- A/G Technology Corporation (Needham, MA)
- Patent Number(s):
- US 4681605
- OSTI ID:
- 866312
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
membranes
gas
separation
membrane
dense
separating
layer
10
000
angstroms
thick
porous
support
400
microns
integral
unit
gradually
continuously
decreasing
pore
size
base
surface
casting
solution
comprising
ethyl
cellulose
cellulose-based
blends
typically
47
ethoxyl
content
blended
compatible
polymers
nitrocellulose
polymer
35
weight
total
50
volatile
solvent
isopropanol
methylacetate
methanol
ethanol
acetone
typical
nonsolvents
solutions
water
formamide
cast
air
zero
allow
evaporate
quenched
coagulation
bath
temperature
degree
-25
dried
ambient
-30
volatile solvent
ambient temperature
pore size
solution comprising
porous support
gas separation
support layer
separation membrane
microns thick
casting solution
air dried
typically water
integral unit
ethyl cellulose
anisotropic membranes
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