	US 11,866,522 B2
	Process for introducing catalyst in a polymerization process
Olavo Martins Junior, São Paulo (BR); Dihogenes Adriano Pozzer, São Paulo (BR); and Élita Cavalli, São Paulo (BR)
Assigned to Braskem S.A., Camaçari (BR)
Filed by Braskem S.A., Camaçari (BR)
Filed on Dec. 27, 2019, as Appl. No. 16/728,772.
Claims priority of provisional application 62/785,748, filed on Dec. 28, 2018.
Prior Publication US 2020/0207886 A1, Jul. 2, 2020
Int. Cl. C08F 4/654 (2006.01); C08F 10/06 (2006.01); C08F 2/02 (2006.01); B01J 4/00 (2006.01); B01J 19/18 (2006.01)

CPC C08F 10/06 (2013.01) [B01J 4/001 (2013.01); B01J 19/18 (2013.01); C08F 2/02 (2013.01); C08F 4/654 (2013.01); B01J 2204/002 (2013.01)]

35 Claims

1. A method of bulk polymerization, the method comprising:

mixing, in a first reactor, a pro-catalyst, in the absence of electron donor and cocatalyst, with liquid propylene to form a pro-catalyst mixture that comprises unreacted liquid propylene and is substantially free of any C20 or greater hydrocarbons;

feeding the pro-catalyst mixture into a second reactor via a feed stream;

feeding a stream of liquid propylene, a stream of electron donor, and a stream of cocatalyst separately into the second reactor to provide a catalyst mixture;

activating the catalyst mixture, in the second reactor or in a further polymerization reactor, at a temperature sufficiently low as to not polymerize or prepolymerize the propylene; and

performing the polymerization in the polymerization reactor,

wherein said mixing is carried out at a temperature of about room temperature to −48° C. and a pressure sufficient to ensure the presence of liquid propylene in the first reactor.