Simulated condensing mode
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorSaul R. Bresch
Life of this patent
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Abstract
A process comprising contacting one or more monomers with a catalyst, in the gas phase, under polymerization conditions, in a fluidized bed reactor, with the proviso that the reactor is at least partially cooled internally by the vaporization of a liquid cryogen directly into the reactor.
Claims11
A process comprising contacting one or more monomers with a catalyst, in the gas phase, under polymerization conditions, in a fluidized bed reactor, with the proviso that the reactor is at least partially cooled internally by the vaporization of a liquid cryogen directly into the reactor.
A process comprising contacting one or more olefin monomers, initially in gas or liquid form, with a catalyst, in the gas phase, under polymerization conditions, in a fluidized bed reactor, with the provisos that:
- (i) the reactor is at least partially cooled internally by the vaporization of a liquid cryogen directly into the fluidized bed of the reactor at one or more locations;
- (ii) the amount of liquid cryogen vaporized directly into the reactor is computer controlled in order to assist in maintaining the fluidized bed at a desired temperature;
- (iii) the process is continuous;
- polymer product and unreacted monomer(s) are removed from the fluidized bed;
- and the unreacted monomer(s) are recycled, essentially in the gas phase, through the fluidized bed, a portion of said unreacted monomer(s) polymerizing and a portion of said unreacted monomer(s) providing the fluidizing medium;
- (iv) additional monomer is added to the recycled monomer(s) prior to entry into the fluidized bed;
- and
- (v) the major proportion of olefin monomer is ethylene or propylene and the minor proportion of olefin monomer is one or more alpha-olefins having up to 12 carbon atoms.
Dependencies are inferred from the claim text.