Multi-step gas-phase polymerization of olefins

Details Multi-step gas-phase polymerization of olefins Multi-step gas-phase polymerization of olefins

1981-05-22

1982-07-06

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in two or more physically distinct zones

526125, 526901, 526905, C08F 234, C08F 1000

Patent

active

043384242

ABSTRACT:
In a process for polymerizing olefins in the gaseous phase in a first gas-phase polymerization zone and a second gas-phase polymerization zone, which are provided independently from each other, in the presence of a catalyst composed of a transition metal catalyst component and an organometallic compound of a metal of Groups I to III of the periodic table and in the co-presence of hydrogen gas while feeding the catalyst-containing polymer formed in the first zone to the second zone; the improvement wherein
(i) a dilution zone for diluting a feed flow from the first gas-phase polymerization zone which comprises a mixture of the polymer, the catalyst, the olefin gas and hydrogen gas by feeding a fresh supply of olefin gas thereto is provided in a feed passage for feeding said flow from the first gas-phase polymerization zone to the second gas-phase polymerization zone,
(ii) a part of the gas phase in said feed flow diluted in the dilution zone is recycled to the first gas-phase polymerization zone, and remainder is fed into the second gas-phase polymerization zone, and
(iii) in the second gas-phase polymerization zone, the hydrogen to olefin mole ratio is maintained lower than that in the first gas-phase polymerization zone.

REFERENCES:
patent: 3392213 (1968-07-01), Berger
patent: 3592880 (1971-07-01), Diedrich et al.
patent: 4048412 (1977-09-01), Caumartin et al.
patent: 4098974 (1978-07-01), Klaassen

Affiliated with

Also associated with

Rating

Multi-step gas-phase polymerization of olefins does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multi-step gas-phase polymerization of olefins, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-step gas-phase polymerization of olefins will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2169419