Production of light olefins
AssigneeUnion Carbide Corporation
InventorSteven W. Kaiser
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Abstract
The process for the production of light olefins from a feedstock comprising methanol, ethanol, dimethyl ether, diethyl ether or mixtures thereof comprising contacting said feedstock with a silicoaluminophosphate molecular sieve at effective process conditions to produce light olefins.
Claims58
The process of making light olefins containing 2 to 4 carbon atoms which comprises contacting a feedstock comprising one or more of methanol, ethanol, dimethyl ether, diethyl ether and mixtures thereof with a silicoaluminophosphate molecular sieve wherein the silicoaluminophosphate molecular sieve comprises a microporous crystalline silicoaluminophosphate whose unit empirical formula in the as-synthesized and anhydrous form is
- mR:(Si.sub.x Al.sub.y P.sub.z)O.sub.2
- wherein "R" represents at least one organic templating agent present in the intracrystalline pore system;
- "m" has a value of from 0.02 to 0.3;
- "m" represents the moles of "R" present per mole of (Si.sub.x Al.sub.y P.sub.z)O.sub.2 ;
- "x", "y" and "z" represent the mole fractions of silicon, aluminum and phosphorus respectively, present as tetrahedral units, said mole fractions being such that they are within the pentagonal compositional area defined by points A, B, C, D and E of the ternary diagram which is FIG. 1 of the drawings.
The process of making light olefins containing 2 to 4 carbon atoms which comprises contacting a feedstock comprising one or more of methanol, ethanol, dimethyl ether, diethyl ether and mixtures thereof with a silicoaluminophosphate molecular sieve wherein the silicoaluminophosphate molecular sieve comprises a microporous crystalline silicoaluminophosphate whose unit empirical formula in the as-synthesized and anhydrous form is
- mR:(Si.sub.x Al.sub.y P.sub.z)O.sub.2
- wherein "R" represents at least one organic templating agent present in the intracrystalline pore system;
- "m" has a value of from zero to 0.3;
- "m" represents the moles of "R" present per mole of (Si.sub.x Al.sub.y P.sub.z)O.sub.2 ;
- "x", "y" and "z" represent the mole fractions of silicon, aluminum and phosphorus, respectively, present as tetrahedral units, said mole fractions being such that they are within the pentagonal compositional area defined by points A, B, C, D and E of the ternary diagram which is FIG. 1 of the drawings, said silicoaluminophosphate having a characteristic X-ray powder diffraction pattern which contains at least the d-spacings set forth in any one of Tables I, III, V, VIII, X, XIII, XVII, XX, XXII, XXIV, XXVI, XXVIII or XXX.
Dependencies are inferred from the claim text.