Patent ID: 7893310
Filing Date: 2011-02-22
Classification: C07C

Abstract:
1. A method for forming and separating an olefin fraction which comprises the following steps: i) contacting oxygenate with a zeolitic aluminosilicate molecular sieve catalyst to form an olefin stream; ii) cooling the olefin stream in a quench system to form a first fraction comprising olefin and a second fraction comprising condensed water and entrained catalyst, wherein the quench system is comprised of a surface structure and at least a portion of the surface structure contacts the condensed water; iii) injecting an antifouling agent into the quench system in an amount to control a zeta potential of the entrained catalyst in the second fraction and an effective zeta potential of the surface of the quench system contacting the condensed water both in a positive range or both in a negative range within an absolute value of at least 2 mV; and iv) separating at least a portion of the second fraction from the first fraction.