Claims
- 1. A process for separating molecular species from admixture with molecular species having a lesser degree of polarity which comprises contacting said mixture of molecular species with a molecular sieve having pore diameters large enough to adsorb at least one of the more polar molecular species, said molecular sieve being at least partially activated whereby molecules of the more polar molecular species are selectively adsorbed into the intracrystalline pore system thereof, said molecular sieve being a crystalline molecular sieve having a three-dimensional microporous framework structure of ELO.sub.2, AlO.sub.2, PO.sub.2, SiO.sub.2 oxide units and having an empirical chemical composition on an anhydrous basis expressed by the formula:
- mR:(EL.sub.w Al.sub.x P.sub.y Si.sub.z)O.sub.2
- wherein "R" represents at least one organic templating agent present in the intracrystalline pore system; "m" represents the molar amount of "R" present per mole of (EL.sub.w Al.sub.x P.sub.y Si.sub.z)O.sub.2 and has a value of zero to about 0.3; "EL" represents at least one element capable of forming a three dimensional oxide framework, "EL" is characterized as an element having a mean "T-O" distance in tetrahedral oxide structures between about 1.51 Angstroms and about 2.06 Angstroms, "EL" has a cation electronegativity between about 125 kcal/g-atom to about 310 kcal/g-atom and "EL" is capable of forming stable M-O-P, M-O-Al or M-O-M bonds in crystalline three dimensional oxide structures having an "M-O" bond dissociation energy greater than about 59 kcal/mole at 298.degree. C.; and "w", "x", "y" and "z" represent the mole fractions of "EL", aluminum, phosphorus, and silicon, respectively, present as framework oxides, said mole fractions being within the pentagonal compositional area defined by points A, B, C, D and E of FIG. 1, wherein element "EL" and each of aluminum, phosphorus and silicon are present such that "w", "x", "y" and "z" are at least 0.01 and each element "EL" is present as a tetrahedral oxide unit ELO.sub.2 in an amount of at least 0.01.
- 2. Process according to claim 1 wherein the more polar molecular species is water.
- 3. A process for separating a mixture of molecular species having different kinetic diameters which comprises contacting said mixture with a molecular sieve having pore diameters large enough to adsorb at least one but not all molecular species of said mixture, said molecular sieve being at least partially activated whereby at least some molecules whose kinetic diameters are sufficiently small can enter the intracrystalline pore system thereof, said molecular sieve being a crystalline molecular sieve having a three-dimensional microporous framework structure of ELO.sub.2, AlO.sub.2, PO.sub.2, SiO.sub.2 oxide units and having an empirical chemical composition on an anhydrous basis expressed by the formula:
- mR:(EL.sub.w Al.sub.x P.sub.y Si.sub.z)O.sub.2
- wherein "R" represents at least one organic templating agent present in the intracrystalline pore system; "m" represents the molar amount of "R" present per mole of (EL.sub.w Al.sub.x P.sub.y Si.sub.z)O.sub.2 and has a value of zero to about 0.3; "EL" represents at least one element capable of forming a three dimensional oxide framework, "EL" is characterized as an element having a mean "T-O" distance in tetrahedral oxide structures between about 1.51 Angstroms and about 2.06 Angstroms, "EL" has a cation electronegativity between about 125 kcal/g-atom to about 310 kcal/g-atom and "EL" is capable of forming stable M-O-P, M-O-Al or M-O-M bonds in crystalline three dimensional oxide structures having an "M-O" bond dissociation energy greater than about 59 kcal/mole at 298.degree. C.; and "w", "x", "y" and "z" represent the mole fractions of "EL", aluminum, phosphorus, and silicon, respectively, present as framework oxides, said mole fractions being within the pentagonal compositional area defined by points A, B, C, D and E of FIG. 1, wherein element "EL" and each of aluminum, phosphorus and silicon are present such that "w", "x", "y" and "z" are at least 0.01 and each element "EL" is present as a tetrahedral oxide unit ELO.sub.2 in an amount of at least 0.01.
Parent Case Info
This is a divisional of copending application(s) Ser. No. 07/182,738 filed on 4/18/88 which is a division of Ser. No. 06/600,312 filed 4/13/84, now U.S. Pat. No. 4,793,984.
US Referenced Citations (4)
Divisions (2)
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Number |
Date |
Country |
Parent |
182738 |
Apr 1988 |
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Parent |
600312 |
Apr 1984 |
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