Carbon molecular sieves and a process for their preparation and use
First Claim
1. A process for the continuous manufacturing of carbon molecular sieves having average effective pore diameters of from 2 to 15 Angstroms and an oxygen/nitrogen selectivity ratio of from 5.0 to 8.5 which comprises continuously feeding a charred naturally occurring substrate to a transport means for heating said substrate and heating said substrate at a maximum oxygen content of 500 ppm under non-activation conditions, without the use of an externally added pore blocking substance, at a temperature range of about 900°
- F. (482°
C.) to 2000°
F. (1093°
C.) for a time period of about 5 to 90 minutes.
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Accused Products
Abstract
The instant invention is directed to a process for the continuous manufacturing of carbon molecular sieves having average effective pore diameters of from 2 to 15 Angstroms which comprises continuously feeding a charred naturally occurring substrate to a means for heating said substrate and heating said substrate under non-activation conditions, without the use of an externally added pore blocking substance, at a temperature range of about 900° F. (482° C.) to 2000° F. (1093° C.) for a time period of about 5 to 90 minutes.
The instant invention is also directed to a carbon molecular sieve, useful for separating gas or liquid mixtures containing components of at least two different molecular diameters, molecular weights or molecular shapes which has the following physical characteristics:
(a) an apparent density of from 0.60 to 0.70 g/cc,
(b) an oxygen diffusivity (×10-8) of from 500 to 900 cm2 /sec,
(c) an oxygen/nitrogen selectivity ratio of from 5.0 to 8.5
(d) an oxygen capacity of from 4.00 to 6.00 cc/cc, and
(e) an average effective pore diameter of about 3 to 5 Angstroms.
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Citations
13 Claims
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1. A process for the continuous manufacturing of carbon molecular sieves having average effective pore diameters of from 2 to 15 Angstroms and an oxygen/nitrogen selectivity ratio of from 5.0 to 8.5 which comprises continuously feeding a charred naturally occurring substrate to a transport means for heating said substrate and heating said substrate at a maximum oxygen content of 500 ppm under non-activation conditions, without the use of an externally added pore blocking substance, at a temperature range of about 900°
- F. (482°
C.) to 2000°
F. (1093°
C.) for a time period of about 5 to 90 minutes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- F. (482°
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12. A carbon molecular sieve, useful for separating gas or liquid mixtures containing components of at least two different molecular diameters, molecular weights or molecular shapes which has the following physical characteristics:
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(a) an apparent density of from 0.60 to 0.70 g/cc, (b) an oxygen diffusivity (×
10-8) of from 500 to 900 cm2 /sec,(c) an oxygen/nitrogen selectivity ratio of from 5.0 to 8.5 (d) an oxygen capacity of from 4.00 to 6.00 cc/cc, and (e) an average effective pore diameter of about 3 to 5 Angstroms. - View Dependent Claims (13)
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Specification