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A process may include selecting a zeolite, introducing phosphorus (P) to the zeolite, calcining the zeolite and obtaining a P modified zeolite. The process may include contacting an oxygen-containing, halogenide-containing or sulphur-containing organic feedstock in a first reactor with a first catal

A process may include selecting a zeolite, introducing phosphorus (P) to the zeolite, calcining the zeolite and obtaining a P modified zeolite. The process may include contacting an oxygen-containing, halogenide-containing or sulphur-containing organic feedstock in a first reactor with a first catalyst that includes the P-modified zeolite at conditions effective to convert at least a portion of the feedstock to form a first reactor effluent that includes light olefins and a heavy hydrocarbon fraction. The process may include separating the light olefins from the heavy hydrocarbon fraction, and contacting the heavy hydrocarbon fraction in a second reactor with a second catalyst that includes the P-modified zeolite at conditions effective to convert at least a portion of the heavy hydrocarbon fraction to light olefins. The first catalyst and the second catalyst may be the same or different.

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1. A process comprising: selecting a zeolite in the H+ or NH4+ form that has an initial Si:Al atomic ratio of 100 or less, wherein the zeolite is an MFI, MEL, MOR, FER or clinoptilolite;steaming the zeolite;after steaming, leaching the zeolite with an aqueous acid solution at conditions effective to

1. A process comprising: selecting a zeolite in the H+ or NH4+ form that has an initial Si:Al atomic ratio of 100 or less, wherein the zeolite is an MFI, MEL, MOR, FER or clinoptilolite;steaming the zeolite;after steaming, leaching the zeolite with an aqueous acid solution at conditions effective to remove a substantial part of Al from the zeolite;after leaching, introducing phosphorus (P) to the zeolite with an aqueous solution containing a source of P at conditions effective to introduce at least 0.05 wt % of P, obtaining a P modified zeolite;contacting an oxygen containing, halogenide containing, or sulphur containing organic feedstock in a first reactor with a first catalyst comprising the P modified zeolite at conditions effective to convert at least a portion of the feedstock to form a first reactor effluent comprising light olefins and a heavy hydrocarbon fraction;separating the light olefins from the heavy hydrocarbon fraction;contacting the heavy hydrocarbon fraction in a second reactor with a second catalyst comprising the P modified zeolite at conditions effective to convert at least a portion of the heavy hydrocarbon fraction to light olefins. 2. The process of claim 1, wherein the first catalyst and the second catalyst are the same. 3. The process of claim 1, wherein the first catalyst and the second catalyst are the different. 4. The process of claim 3, wherein the first catalyst and the second catalyst comprise different zeolites. 5. The process of claim 3, wherein the first catalyst and the second catalyst have different contents of phosphorus. 6. The process of claim 3, wherein the first catalyst and the second catalyst have different Si/Al ratios. 7. The process of claim 1, wherein the feedstock comprises an aliphatic alcohol, an ether, or a carbonyl compound. 8. The process of claim 1, wherein the feedstock comprises methanol, ethanol, n-propanol, isopropanol, a C4-C20 alcohol, methyl ethyl ether, dimethyl ether, diethyl ether, di-isopropyl ether, formaldehyde, dimethyl carbonate, dimethyl ketone, acetic acid, or mixtures thereof. 9. The process of claim 1, wherein the feedstock comprises methyl mercaptan, dimethyl sulfide, ethyl mercaptan, di-ethyl sulfide, ethyl monochloride, methyl monochloride, methyl dichloride, an n-alkyl halide having from 1 to 10 carbon atoms, an n-alkyl sulfide having from 1 to 10 carbon atoms, or mixtures thereof. 10. The process of claim 1, wherein within the first reactor effluent, more than 50 weight percent of olefins having 4 carbon atoms or more are butenes. 11. A process comprising: selecting a first zeolite in the H+ or NH4+ form that has an initial Si:Al atomic ratio of 100 or less, wherein the first zeolite is an MFI, MEL, MOR, FER or clinoptilolite;steaming the first zeolite;after steaming, leaching the first zeolite with an aqueous acid solution at conditions effective to remove a substantial part of Al from the first zeolite;after leaching, introducing phosphorus (P) to the first zeolite with an aqueous solution containing a source of P at conditions effective to introduce at least 0.05 wt % of P, obtaining a first P modified zeolite;contacting an oxygen containing, halogenide containing, or sulphur containing organic feedstock in a first reactor with a first catalyst comprising the first P modified zeolite at conditions effective to convert at least a portion of the feedstock to form a first reactor effluent comprising light olefins and a heavy hydrocarbon fraction;separating the light olefins from the heavy hydrocarbon fraction;selecting a second zeolite in the H+ or NH4+ form that has an initial Si:Al atomic ratio of 100 or less, wherein the second zeolite is an MFI, MEL, MOR, FER or clinoptilolite;steaming the second zeolite;after steaming, leaching the second zeolite with an aqueous acid solution at conditions effective to remove a substantial part of Al from the second zeolite;after leaching, introducing phosphorus (P) to the second zeolite with an aqueous solution containing a source of P at conditions effective to introduce at least 0.05 wt % of P, obtaining a second P modified zeolite; andcontacting the heavy hydrocarbon fraction in a second reactor with a second catalyst comprising the second P modified zeolite at conditions effective to convert at least a portion of the heavy hydrocarbon fraction to light olefins. 12. The process of claim 11, wherein the first P modified zeolite and the second P modified zeolite are different. 13. The process of claim 12, wherein the first P modified zeolite and the second P modified zeolite comprise different zeolites. 14. The process of claim 12, wherein the first P modified zeolite and the second P modified zeolite have different contents of phosphorus. 15. The process of claim 12, wherein the first P modified zeolite and the second P modified zeolite have different Si/Al ratios. 16. A process comprising: selecting a first zeolite in the H+ or NH4+ form that has an initial Si:Al atomic ratio of 100 or less, wherein the first zeolite is an MFI, MEL, MOR, FER or clinoptilolite;steaming the first zeolite;after steaming, leaching the first zeolite with an aqueous acid solution at conditions effective to remove a substantial part of Al from the first zeolite;introducing phosphorus (P) to the first zeolite at conditions effective to introduce at least 0.05 wt % of P to the first zeolite;and calcining the first zeolite, obtaining a first P modified zeolite;contacting an oxygen-containing, halogenide-containing or sulphur-containing organic feedstock in a first reactor with a first catalyst comprising the first P modified zeolite at conditions effective to convert at least a portion of the feedstock to form a first reactor effluent comprising light olefins and a heavy hydrocarbon fraction;separating the light olefins from the heavy hydrocarbon fraction;selecting a second zeolite in the H+ or NH4+ form that has an initial Si:Al atomic ratio of 100 or less, wherein the second zeolite is an MFI, MEL, MOR, FER or clinoptilolite;steaming the second zeolite;after steaming, leaching the second zeolite with an aqueous acid solution at conditions effective to remove a substantial part of Al from the second zeolite;introducing phosphorus (P) to the second zeolite at conditions effective to introduce at least 0.05 wt % of P to the second zeolite;and calcining the second zeolite, obtaining a second P modified zeolite;contacting the heavy hydrocarbon fraction in a second reactor with a second catalyst comprising the second P-modified zeolite at conditions effective to convert at least a portion of the heavy hydrocarbon fraction to light olefins,wherein the first catalyst and the second catalyst are the same or different. 17. The process of claim 16, wherein the first P modified zeolite and the second P modified zeolite are different. 18. The process of claim 17, wherein the first P modified zeolite and the second P modified zeolite comprise different zeolites. 19. The process of claim 17, wherein the first P modified zeolite and the second P modified zeolite have different contents of phosphorus. 20. The process of claim 17, wherein the first P modified zeolite and the second P modified zeolite have different Si/Al ratios.