Production of olefin dimers and oligomers

A method of converting an oxygenate to a dimerized or oligomerized olefin product, comprising:

• contacting oxygenate with a SAPO-34 molecular sieve catalyst to form an olefin product;
• separating a propylene, butylene, or pentylene containing olefin stream from the olefin product, wherein the separated olefin stream comprises at least 50 wt. % propylene, butylene, pentylene, or a combination thereof, and the separated olefin stream contains not greater than 1 ppm by weight sulfur, not greater than 1 ppm by weight nitrogen, and not greater than 0.5 ppm by weight chlorine, each calculated on an atomic basis, and 0.5 to 10 wt. % isoolefin;
• and
• contacting the separated olefin stream with a nickel based oligomerization catalyst to form a dimer or oligomer product.

A method of converting an oxygenate to a hydroformylated product, comprising:

• contacting oxygenate with a silicoaluminophosphate molecular sieve catalyst to form an olefin product;
• separating a propylene, butylene or pentylene containing olefin stream from the olefin product, wherein the separated olefin stream comprises at least 50 wt. % propylene, butylene, pentylene, or a combination thereof, and the separated olefin stream contains not greater than 1 ppm by weight sulfur calculated on an atomic basis, and 0.5 to 10 wt. % isoolefin;
• contacting the separated olefin stream with a nickel based oligomerization catalyst to form a dimer or oligomer product;
• and
• contacting the dimer or oligomer product with a hydroformylating catalyst to form a hydroformylated product.