Methods of changing polyolefin production rate with the composition of the induced condensing agents

A method comprising:

• contacting in a fluidized bed gas phase reactor an olefin monomer with a catalyst system in the presence of an induced condensing agent (ICA) and optionally hydrogen to produce a polyolefin having a sticking temperature, wherein the ICA comprises a first ICA component and a second ICA component;
• operating the fluidized bed gas phase reactor at an operating temperature lower than the sticking temperature of the polyolefin;
• withdrawing a gas phase composition comprising at least some of the olefin, at least some of the ICA, and optionally at least some hydrogen;
• condensing a portion of the ICA from the gas phase composition yielding a condensed ICA;
• recycling at least a portion of the condensed ICA and at least a portion of the gas phase composition to the fluidized bed gas phase reactor;
• and
• changing a mole percent of total reactor gas for each of the first and the second ICA components according to a first ICA component to second ICA component equivalency factor whereby one mole of the second ICA component is substituted with a predetermined number of moles of the first ICA component thereby maintaining the sticking temperature of the polyolefin and increasing the dew point approach temperature.

A method comprising:

• contacting in a fluidized bed gas phase reactor an olefin monomer with a catalyst system in the presence of an induced condensing agent (ICA) and optionally hydrogen to produce a polyolefin having a sticking temperature, wherein the ICA comprises a first ICA component and a second ICA component;
• operating the fluidized bed gas phase reactor at an operating temperature lower than the sticking temperature of the polyolefin;
• withdrawing a gas phase composition comprising at least some of the olefin, at least some of the ICA, and optionally at least some hydrogen;
• condensing a portion of the ICA from the gas phase composition yielding a condensed ICA;
• recycling at least a portion of the condensed ICA and at least a portion of the gas phase composition to the fluidized bed gas phase reactor;
• and
• increasing a polyolefin production rate by changing a mole percent of total reactor gas for each of the first and the second ICA components according to a first ICA component to second ICA component equivalency factor whereby one mole of the second ICA component is substituted with a predetermined number of moles of the first ICA component while maintaining the sticking temperature, thereby increasing a dew point approach temperature of the ICA, wherein the dew point approach temperature is an operating temperature of the reactor minus a dew point of the condensed recycle stream.