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This invention is to a process for removing dimethyl ether from an olefin stream. The process includes contacting the olefin stream with a molecular sieve that has improved capacity to adsorb the dimethyl ether from the olefin stream. The molecular sieve used to remove the dimethyl ether has low or

This invention is to a process for removing dimethyl ether from an olefin stream. The process includes contacting the olefin stream with a molecular sieve that has improved capacity to adsorb the dimethyl ether from the olefin stream. The molecular sieve used to remove the dimethyl ether has low or no activity in converting the olefin in the olefin stream to other products.

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What is claimed is: 1. A process for forming a polyolefin, the process comprising the steps of: i) providing an oxygenate stream for conversion to olefins; ii) removing at least a portion of the oxygenate from the olefin stream to form a reduced-oxygenate olefin stream by the following steps: a) pr

What is claimed is: 1. A process for forming a polyolefin, the process comprising the steps of: i) providing an oxygenate stream for conversion to olefins; ii) removing at least a portion of the oxygenate from the olefin stream to form a reduced-oxygenate olefin stream by the following steps: a) providing an olefin stream, wherein the olefin stream contains oxygenate, and the olefin stream is comprised of greater than 50 wt % ethylene and propylene, and wherein the olefin stream comprises not greater than 5 wt % butane; and b) contacting the provided olefin stream with a solid adsorbent to remove oxygenate from the provided olefin stream, wherein the solid adsorbent has an oxygenate adsorption capacity of at least 0.1 wt % and a cumulative oligomer selectivity of not greater than 5 wt %, wherein the solid adsorbent comprises at least one ion from Group 2, 4, 6, 12, 13, 14 or 15 of the Periodic Table of the Elements; and iii) polymerizing one or more olefins in the reduced-oxygenate olefin stream, optionally in conjunction with one or more olefins from a source other than the olefin stream, in the presence of a polyolefin-forming catalyst under conditions sufficient to form a polyolefin. 2. The process of claim 1, wherein the solid adsorbent has an oxygenate adsorption capacity of at least 0.2 wt %. 3. The process of claim 2, wherein the solid adsorbent has an oxygenate adsorption capacity of at least 0.5 wt %. 4. The process of claim 3, wherein the solid adsorbent has an oxygenate adsorption capacity of at least 1.0 wt %. 5. The process of claim 1, wherein the solid adsorbent has a cumulative oligomer selectivity of not greater than 3 wt %. 6. The process of claim 5, wherein the solid adsorbent has a cumulative oligomer selectivity of not greater than 2 wt %. 7. The process of claim 6, wherein the solid adsorbent has a cumulative oligomer selectivity of not greater than 1 wt %. 8. The process of claim 1, wherein the contacting removes a majority of the oxygenate from the provided olefin stream. 9. The process of claim 8, wherein the oxygenate in the provided olefin stream is dimethyl ether or acetaldehyde. 10. The process of claim 9, wherein the oxygenate in the provided olefin stream is dimethyl ether. 11. The process of claim 1, wherein the solid adsorbent comprises at least one ion from Group 2 or 12 of the Periodic Table of the Elements. 12. The process of claim 11, wherein the solid adsorbent comprises magnesium or zinc. 13. The process of claim 1, wherein the provided olefin stream comprises at least 50 wt % propylene and butylene, based on total weight of the provided olefin stream. 14. The process of claim 1, wherein the provided olefin stream comprises not greater than 1,000 wppm oxygenate, based on total weight of the provided olefin stream. 15. The process of claim 14, wherein the oxygenate is dimethyl ether or acetaldehyde. 16. The process of claim 15, wherein the oxygenate is dimethyl ether. 17. The process of claim 1, wherein the solid adsorbent is a molecular sieve or metal oxide. 18. The process of claim 1, wherein the solid adsorbent is a crystalline molecular sieve. 19. The process of claim 17, wherein the solid adsorbent is a molecular sieve selected from the group consisting of silicates, aluminosilicates, aluminophosphates, and silicoaluminophosphates. 20. The process of claim 1, wherein the solid adsorbent is a molecular sieve having a framework structure of at least 8 rings. 21. The process of claim 20, wherein the molecular sieve is a zeolite. 22. The process of claim 20, wherein the molecular sieve is zeolite X, zeolite Y, ZSM-5, ZSM-11, ZSM-14, ZSM-17, ZSM-18, ZSM-20, ZSM-31, ZSM-34, ZSM-41 or ZSM-46. 23. The process of claim 20, wherein the molecular sieve is zeolite X or Y. 24. The process of claim 20, wherein the molecular sieve is zeolite X. 25. The process of claim 1, wherein the solid adsorbent is regenerated following contacting with the provided olefin stream. 26. A process for forming a polyolefin, the process comprising the steps of: i) providing an oxygenate composition containing dimethyl ether for conversion to olefins; ii) removing at least a portion of the dimethyl ether from the olefin stream to form a reduced-oxygenate olefin stream by the following steps: a) contacting an oxygenate with a molecular sieve catalyst to form an olefin composition, wherein the olefin composition contains greater than 50 wt % ethylene and propylene and contains dimethyl ether, and wherein the olefin composition comprises not greater than 5 wt % butane; and b) contacting at least a portion of the olefin composition containing the dimethyl ether with a solid adsorbent to remove at least a portion of the dimethyl ether from the provided olefin stream, wherein the solid adsorbent has a dimethyl ether adsorption capacity of at least 0.1 wt % and a cumulative oligomer selectivity of not greater than 5 wt %, wherein the solid adsorbent comprises at least one ion from Group 2, 4, 6, 12, 13, 14 or 15 of the Periodic Table of the Elements and iii) polymerizing one or more olefins in the reduced-oxygenate olefin stream, optionally in conjunction with one or more olefins from a source other than the olefin stream, in the presence of a polyolefin-forming catalyst under conditions sufficient to form a polyolefin. 27. The process of claim 26, wherein the solid adsorbent has a dimethyl ether adsorption capacity of at least 0.2 wt %. 28. The process of claim 27, wherein the solid adsorbent has a dimethyl ether adsorption capacity of at least 0.5 wt %. 29. The process of claim 28, wherein the solid adsorbent has a dimethyl ether adsorption capacity of at least 1.0 wt %. 30. The process of claim 26, wherein the solid adsorbent has a cumulative oligomer selectivity of not greater than 3 wt %. 31. The process of claim 30, wherein the solid adsorbent has a cumulative oligomer selectivity of not greater than 2 wt %. 32. The process of claim 26, wherein the contacting removes a majority of the dimethyl ether from the provided olefin stream. 33. The process of claim 26, wherein the solid adsorbent comprises at least one ion from Group 2 or 12 of the Periodic Table of the Elements. 34. The process of claim 33, wherein the solid adsorbent comprises magnesium or zinc. 35. The process of claim 26, wherein the olefin composition formed in step a) is further processed to remove non-olefin components from the olefin composition prior to contacting the olefin composition with the solid adsorbent in step b). 36. The process of claim 26, wherein the olefin composition formed in step a) is further processed prior to carrying out step b). 37. The process of claim 26, wherein the olefin composition formed in step a) is dewatered and split into at least two olefin streams, and one of the olefin streams is the olefin stream of step b). 38. The process of claim 26, wherein the solid adsorbent that removes at least a portion of the dimethyl ether from the olefin stream is a molecular sieve or metal oxide. 39. The process of claim 38, wherein the solid adsorbent that removes at least a portion of the dimethyl ether from the olefin stream is a crystalline molecular sieve. 40. The process of claim 38, wherein the solid adsorbent is a molecular sieve is selected from the group consisting of silicates, aluminosilicates, aluminophosphates, and silicoaluminophosphates. 41. The process of claim 38, wherein the solid adsorbent is a molecular sieve having a framework structure of at least 8 rings. 42. The process of claim 41, wherein the molecular sieve is a zeolite. 43. The process of claim 41, wherein the molecular sieve is zeolite X, zeolite Y, ZSM-5, ZSM-11, ZSM-14, ZSM-17, ZSM-18, ZSM-20, ZSM-31, ZSM-34, ZSM-41 or ZSM-46. 44. The process of claim 42, wherein the molecular sieve is zeolite X or Y. 45. The process of claim 44, wherein the molecular sieve is zeolite X. 46. The process of claim 26, wherein the olefin composition of step b) comprises at least 50 wt % ethylene, propylene, butylene, or a combination thereof, based on total weight of the olefin composition of step b). 47. The process of claim 26, wherein the provided olefin stream comprises not greater than 1,000 wppm dimethyl ether, based on total weight of the provided olefin stream. 48. The process of claim 30, wherein the solid adsorbent is regenerated following contacting with the provided olefin stream. 49. A process for removing dimethyl ether from an olefin stream, the process comprising the steps of: a) providing an olefin stream, wherein the olefin stream comprises dimethyl ether and greater than 50 wt % ethylene, propylene, or a combination thereof, based on total weight of the olefin stream, and wherein the olefin stream comprises not greater than 5 wt % butane; and b) contacting the provided olefin stream with a molecular sieve to remove at least a portion of the dimethyl ether from the provided olefin stream, wherein the molecular sieve has a dimethyl ether adsorption capacity of at least 0.1 wt % and an oligomer accumulation of not greater than 5 wt %, wherein the molecular sieve comprises at least one ion from Group 2, 4, 6, 12, 13, 14 or 15 of the Periodic Table of the Elements. 50. The process of claim 49, wherein the molecular sieve has a dimethyl ether adsorption capacity of at least 0.2 wt %. 51. The process of claim 50, wherein the molecular sieve has a dimethyl ether adsorption capacity of at least 0.5 wt %. 52. The process of claim 51, wherein the molecular sieve has a dimethyl ether adsorption capacity of at least 1.0 wt %. 53. The process of claim 49, wherein the molecular sieve has a cumulative oligomer selectivity of not greater than 3 wt %. 54. The process of claim 53, wherein the molecular sieve has a cumulative oligomer selectivity of not greater than 2 wt %. 55. The process of claim 54, wherein the molecular sieve has a cumulative oligomer selectivity of not greater than 1 wt %. 56. The process of claim 49, wherein the contacting removes a majority of the dimethyl ether from the provided olefin stream. 57. The process of claim 49, wherein the molecular sieve comprises at least one ion from Group 2 or 12 of the Periodic Table of the Elements. 58. The process of claim 57, wherein the molecular sieve comprises magnesium or zinc. 59. The process of claim 49, wherein the provided olefin stream comprises at least 50 wt % propylene and butylene, based on total weight of the provided olefin stream. 60. The process of claim 49, wherein the molecular sieve is a crystalline molecular sieve. 61. The process of claim 60, wherein the molecular sieve is selected from the group consisting of silicates, aluminosilicates, aluminophosphates, and silicoaluminophosphates. 62. The process of claim 60, wherein the molecular sieve has a framework structure of at least 8 rings. 63. The process of claim 60, wherein the molecular sieve is a zeolite. 64. The process of claim 60, wherein the molecular sieve is zeolite X, zeolite Y, ZSM-5, ZSM-11, ZSM-14, ZSM-17, ZSM-18, ZSM-20, ZSM-31, ZSM-34, ZSM-41 or ZSM-46. 65. The process of claim 60, wherein the molecular sieve is zeolite X or Y. 66. The process of claim 65, wherein the molecular sieve is zeolite X. 67. The process of claim 1, wherein the olefin stream is comprised of about 55 wt % to about 99 wt % of ethylene and propylene. 68. The process of claim 26, wherein the olefin composition contains about 55 wt % to about 99 wt % of ethylene and propylene. 69. The process of claim 49, wherein the olefin stream comprises about 55 wt % to about 99 wt % of ethylene, propylene, or a combination thereof. 70. The process of claim 1, wherein the olefin stream is comprised of about 60 wt % to about 95 wt % of ethylene and propylene. 71. The process of claim 26, wherein the olefin composition contains about 60 wt % to about 95 wt % of ethylene and propylene. 72. The process of claim 49, wherein the olefin stream comprises about 60 wt % to about 95 wt % of ethylene, propylene, or a combination thereof.