Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-09-14
1991-12-10
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55 68, 55 75, 55389, 502417, 502432, 502437, B01D 5304, B01J 2002
Patent
active
050714503
ABSTRACT:
A process is provided for making a modified carbon molecular sieve which is suitable for separating gases having different adsorption rates on the sieve. The process involves modifying a starting sieve support having a majority of micropores with an effective pore size of about 4.5 to 20 angstroms, with a two-step process in which the sieve is contacted with two different concentrations of a volatile carbon-containing organic compound, preferably a hydrocarbon. The concentration of the carbon-containing compound used in the first step is larger than that in the second step, so that the pore openings of the micropores of the support are narrowed successively in two distinct steps without filling the micropores themselves. The invention also discloses an improved carbon molecular sieve and the separation of gases, such as oxygen from nitrogen, by the use of this improved adsorbent.
REFERENCES:
patent: 3801513 (1974-04-01), Munzner et al.
patent: 4458022 (1984-07-01), Ohsaki et al.
patent: 4526887 (1985-07-01), Sutt, Jr.
patent: 4528281 (1985-07-01), Sutt, Jr.
patent: 4594163 (1986-06-01), Sutt, Jr.
patent: 4734394 (1988-03-01), Koasaka et al.
patent: 4790859 (1988-12-01), Marumo et al.
patent: 4820681 (1989-04-01), Chang et al.
patent: 4880765 (1989-11-01), Knoblauch et al.
patent: 4902312 (1990-02-01), Chang
patent: 4925461 (1990-05-01), Gemba et al.
patent: 4933314 (1990-06-01), Marumo et al.
P. L. Walker, Jr., "Molecular Sieves", Mineral Industries, Jan. 1966.
Y. Nakano et al., "Control of Micropores of Molecular Sieving Carbon by Impregnation of Hydrocarbons and Heat Treatment", 20th Spring Chemical Industrial Convention of Hirneji, Oct. (1987).
R. Chihara, "Air Separation By Modified Molecular Sieving Carbon", Proc. Third Pacific Chem. Org. Congress, vol. 1 (1983).
S. I. Surinova, "Formation of the Porous Structure of Carbon Molecular Sieves from Caking Coals", Khim. Teord. Top, Moscow (5) 86-90 (1988).
W. P. Hoffman, et al., "Pyrolysis of Propylene Over Carbon Active Sites II. Pyrolysis Products", Carbon, vol. 26, No. 4, pp. 485-499 (1988).
Armor John N.
Cabrera Alejandro L.
Air Products and Chemicals Inc.
Marsh William F.
Rodgers Mark L.
Simmons James C.
Spitzer Robert
LandOfFree
Modified carbon molecular sieve adsorbents does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modified carbon molecular sieve adsorbents, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modified carbon molecular sieve adsorbents will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1037728