Carbon molecular sieves and a process for their preparation and use
First Claim
1. A process for separating gas mixtures containing components of at least two different molecular diameters, molecular weights or molecular shapes comprising passing the gas through a carbon molecular sieve prepared from a naturally occurring substrate and selected from the group consisting of molecular sieves having:
- (a)(i) an oxygen diffusivity of 800×
10-8 cm2 /sec or less; and
(ii) a diffusivity ratio of oxygen to nitrogen of 15 to 100;
(b)(i) an oxygen diffusivity of 600×
10-8 cm2 /sec or less; and
(ii) a diffusivity ratio of oxygen to nitrogen greater than 100; and
(c)(i) an oxygen diffusivity greater than 800×
10-8 cm2 /sec; and
(ii) a diffusivity ratio of oxygen to nitrogen greater than 5;
here the diffusivity is measured using a starting gas pressure of one atmosphere (+/-5%) at a temperature of 25°
+/-5% for 30 seconds.
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Abstract
The present invention relates to a process for separating mixtures of gases or liquids containing at least two different molecular characteristics which comprise passing the liquid or gas through a carbon molecular sieve prepared from a naturally occurring substrate and selected from the group consisting of molecular sieves having:
a. an oxygen diffusivity of 800×10-8 cm2 /sec or less and a diffusivity ratio of oxygen to nitrogen of 15 to 100;
b. an oxygen diffusivity of 600×10-8 cm2 /sec or less and a diffusivity ratio of oxygen to nitrogen greater than 100; and
c. an oxygen diffusivity greater than 800×10-8 cm2 /sec and a diffusivity ratio of oxygen to nitrogen greater than 5;
where the diffusivity is measured using a starting gas pressure of one atmosphere (+/-5%) at a temperature of 25° +/-5% for 30 seconds.
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Citations
20 Claims
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1. A process for separating gas mixtures containing components of at least two different molecular diameters, molecular weights or molecular shapes comprising passing the gas through a carbon molecular sieve prepared from a naturally occurring substrate and selected from the group consisting of molecular sieves having:
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(a) (i) an oxygen diffusivity of 800×
10-8 cm2 /sec or less; and(ii) a diffusivity ratio of oxygen to nitrogen of 15 to 100; (b) (i) an oxygen diffusivity of 600×
10-8 cm2 /sec or less; and(ii) a diffusivity ratio of oxygen to nitrogen greater than 100; and (c) (i) an oxygen diffusivity greater than 800×
10-8 cm2 /sec; and(ii) a diffusivity ratio of oxygen to nitrogen greater than 5; here the diffusivity is measured using a starting gas pressure of one atmosphere (+/-5%) at a temperature of 25°
+/-5% for 30 seconds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification