Mixtures of molecular sieves comprising MeAPO, their use in conversion of organics to olefins

摘要

The present invention is a mixture comprising by weight 0.01 to 28% of at least one medium or large pore crystalline silicoaluminate, silicoaluminophosphate materials or silicoaluminate mesoporous molecular sieves (co-catalyst) (A) for respectively 99.99 to 72% of at least a MeAPO molecular sieve.;Preferably the proportion of (A) is 1 to 15% for respectively 99 to 85% of MeAPO molecular sieves.;MeAPO molecular sieves having CHA (SAPO-34) or AEI (SAPO-18) structure or mixture thereof are the most preferable. Si is the most desirable metal in MeAPO.;The present invention also relates to catalysts consisting of the above mixture or comprising the above mixture.;The present invention also relates to a process (hereunder referred as “XTO process”) for making an olefin product from an oxygen-containing, halogenide-containing or sulphur-containing organic feedstock wherein said oxygen-containing, halogenide-containing or sulphur-containing organic feedstock is contacted with the above catalyst (in the XTO reactor) under conditions effective to convert the oxygen-containing, halogenide-containing or sulphur-containing organic feedstock to olefin products (the XTO reactor effluent).;The present invention also relates to a process (hereunder referred as “combined XTO and OCP process”) to make light olefins from an oxygen-containing, halogenide-containing or sulphur-containing organic feedstock comprising:
contacting said oxygen-containing, halogenide-containing or sulphur-containing organic feedstock in the XTO reactor with the above catalyst 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 said light olefins from said heavy hydrocarbon fraction;contacting said heavy hydrocarbon fraction in the OCP reactor at conditions effective to convert at least a portion of said heavy hydrocarbon fraction to light olefins.

主权项

1. A mixture comprising at least 1 wt. % and up to 8 wt. % of a material selected from group A and 99 to 72 wt. % of at least a MeAPO molecular sieve, wherein group A represents at least one medium or large pore crystalline silicoaluminate or silicoaluminate mesoporous molecular sieve;
wherein the medium pore crystalline silicoaluminate is selected from the group consisting of MFI, FER and MEL; wherein the large pore crystalline silicoaluminate is selected from the group consisting of FAU, MOR, LTL, MAZ, MWW and BEA; and wherein the silicoaluminate mesoporous molecular sieves is MCM-41.