Process for the preparation of a molecular sieve adsorbent for selectively adsorbing methane from a gaseous mixture
First Claim
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1. A process for preparing a molecular sieve adsorbent for selectively adsorbing methane from a gaseous mixture comprising methane and nitrogen, said process comprising:
- (a) preparing a mixture of zeolite powder from a zeolite of the formula
space="preserve" listing-type="equation">Na.sub.m Al.sub.m Si.sub.48-m O.sub.96 nH.sub.2 Owhere m is from 2 to 8, n is from 0 to 30, the value of n depends on the value of m and degree of hydration.and, clay and an organic binder;
(b) shaping said zeolite mixture to obtain adsorbent bodies;
(c) subjecting said adsorbent bodies to calcination; and
(d) subjecting said adsorbent bodies either prior to or after calcination or both, to cationic exchange in the presence of an alkali metal solution to affect surface modification of said adsorbent bodies to obtain said molecular sieve adsorbent of the formula
space="preserve" listing-type="equation">Na.sub.a.M1.sub.b.M2.sub.c.Al.sub.x.Si.sub.48-x.O.sub.96.nH.sub.2 Owhere the value ofa is from 0.1 to 1,b and c are from 0 to 8and x is from 2 to 8,M1 is potassium or cesium or a mixture thereof and M2 is a rare earth metal ion, and n represents the moles of water.
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Abstract
This invention relates to the manufacture of a molecular sieve adsorbent for selectively separating methane from its gaseous mixture with nitrogen. More particularly, the invention relates to the manufacture of novel molecular sieve adsorbents useful for the separation of methane-nitrogen gaseous mixture.
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14 Claims
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1. A process for preparing a molecular sieve adsorbent for selectively adsorbing methane from a gaseous mixture comprising methane and nitrogen, said process comprising:
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(a) preparing a mixture of zeolite powder from a zeolite of the formula
space="preserve" listing-type="equation">Na.sub.m Al.sub.m Si.sub.48-m O.sub.96 nH.sub.2 Owhere m is from 2 to 8, n is from 0 to 30, the value of n depends on the value of m and degree of hydration. and, clay and an organic binder; (b) shaping said zeolite mixture to obtain adsorbent bodies; (c) subjecting said adsorbent bodies to calcination; and (d) subjecting said adsorbent bodies either prior to or after calcination or both, to cationic exchange in the presence of an alkali metal solution to affect surface modification of said adsorbent bodies to obtain said molecular sieve adsorbent of the formula
space="preserve" listing-type="equation">Na.sub.a.M1.sub.b.M2.sub.c.Al.sub.x.Si.sub.48-x.O.sub.96.nH.sub.2 Owhere the value of a is from 0.1 to 1, b and c are from 0 to 8 and x is from 2 to 8, M1 is potassium or cesium or a mixture thereof and M2 is a rare earth metal ion, and n represents the moles of water. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. A molecular sieve adsorbent of the formula
- space="preserve" listing-type="equation">Na.sub.8. M1.sub.b.M2.sub.c.Al.sub.x.Si.sub.48-x.O.sub.96.nH.sub.2 O
where the value of a is from 0.1 to 1, b and c are from 0 to 8 and x is from 2to 8, M1 is potassium or cesium or a mixture thereof and M2 is a rare earth metal ion, and n represents the moles of water which is methane selective.
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