Process to make olefins from oxygenates

摘要

The present invention relates to a process to make light olefins, in a combined XTO-OC process, from an oxygen-containing, halogenide-containing or sulphur-containing organic feedstock comprising:
a0) providing a first portion and a second portion of said oxygen-containing, halogenide-containing or sulphur-containing organic feedstock,a) providing a catalyst comprising zeolitic molecular sieves containing at least 10 membered ring pore openings or larger in their microporous structure,b) providing an XTO reaction zone, an OC reaction zone and a catalyst regeneration zone, said catalyst circulating in the three zones, such that at least a portion of the regenerated catalyst is passed to the OC reaction zone, at least a portion of the catalyst in the OC reaction zone is passed to the XTO reaction zone and at least a portion of the catalyst in the XTO reaction zone is passed to the regeneration zone;c) contacting the first portion of said oxygen-containing, halogenide-containing or sulphur-containing organic feedstock in the XTO reactor with the catalyst at conditions effective to convert at least a portion of the feedstock to form a XTO reactor effluent comprising light olefins and a heavy hydrocarbon fraction;d) separating said light olefins from said heavy hydrocarbon fraction;e) contacting said heavy hydrocarbon fraction and the second portion of said oxygen-containing, halogenide-containing or sulphur-containing organic feedstock in the OC reactor with the catalyst at conditions effective to convert at least a portion of said heavy hydrocarbon fraction and oxygen-containing, halogenide-containing or sulphur-containing organic feedstock to light olefins.

主权项

1. A process of making light olefins, in a combined Oxygenate to Olefin (XTO)-Olefin Cracking (OC) process, from an oxygen-containing, halogenide-containing or sulphur-containing organic feedstock comprising:
selecting a zeolite having an Si/Al ratio between 4 and 30 from an H+ or NH4+ form of MFI, MEL, FER, MOR, or clinoptilolite; steaming the zeolite at a temperature ranging from 400 to 870° C. for 0.01-200 h; leaching the zeolite with an aqueous acid solution at conditions effective to remove at least 10% of Al from the zeolite; contacting the zeolite with an aqueous solution containing a source of P at conditions effective to introduce at least 0.05 wt % of P to form a solid zeolite in liquid; separating the solid zeolite from the liquid; and calcining the solid zeolite to form a P-modified zeolite; providing a first portion and a second portion of a feedstock that is an oxygen-containing, halogenide-containing, or sulphur-containing organic feedstock; providing an XTO reaction zone, an OC reaction zone and a catalyst regeneration zone, wherein one or more catalysts are in the XTO reaction zone and the same one or more catalysts are in the OC reaction zone, and wherein each of the one or more catalysts is a zeolitic molecular sieve containing at least 10 membered rings pore opening in their microporous structure, wherein at least one of the catalysts comprises the P-modified zeolite; wherein the one or more catalysts circulates in the three zones, such that at least a portion of the one or more catalysts from the catalyst regeneration zone is passed to the OC reaction zone, at least a portion of the one or more catalysts in the OC reaction zone is passed to the XTO reaction zone and at least a portion of the one or more catalysts in the XTO reaction zone is passed to the catalyst regeneration zone; contacting the first portion of the feedstock in the XTO reactor with the one or more catalysts at conditions effective to convert at least a portion of the feedstock to form an XTO reactor effluent comprising light olefins and a heavy hydrocarbon fraction; separating the light olefins from the heavy hydrocarbon fraction; and contacting the heavy hydrocarbon fraction and the second portion of the feedstock in the OC reactor with the one or more catalysts at conditions effective to convert at least a portion of the heavy hydrocarbon fraction and the feedstock to light olefins.