Patent EP0040992A1 successfully refreshed from Google Patents.
EP0040992A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for multi-step gas-phase polymerization of olefins
Assignee: Mitsui Chemicals Inc
•
Filing: 1981-05-27
•
Granted: —
•
Expires: 2001-05-27
Abstract
Abstract A process for polymerizing olefins in the gaseous phase in separate first and second gas-phase polymerization zones, in the presence of a catalyst composed of a transition metal catalyst component and an organo-metallic compound of a metal of Groups I to III of the periodic table while feeding the catalyst-containing polymer formed in the first zone to the second zone through a feed passage, wherein [i] a suspension zone is provided in the feed passage for forming a suspension of the polymer from the first zone in an easily volatile hydrocarbon medium which is liquid under the conditions of feeding the polymer; and [ii] the suspension formed in the suspension zone is fed to the second zone.
Inventors
- 👤 Yoshinori Morita
- 👤 Shinzi Hayata
- 👤 Akifumi Kato
- 👤 Tohru Watanabe
- 👤 Hideo Nara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 22:54
CPC Classifications
C; C08; C08F; C08F10/00; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; C08F10/02; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F210/00; C08F210/16; Y; Y10; Y10S; Y10S526/00; Y10S526/901
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
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 organometallicoompound of a metal of Groups I to III of the periodic table while feeding the catalyst-containing polymer formed in the first zone to the second zone; characterised by: (i) providing in a feed passage for feeding the polymer from the first zone to the second zone a suspension zone for forming a suspension of the polymer from the first zone in an easily volatile hydrocarbon medium which is liquid under the conditions of feeding the polymer; and (ii) feeding the suspension of the polymer in said liquid medium formed in the suspension zone to the second zone.
Claim 2
Dependent Claim
141 words
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 organometallicoompound of a metal of Groups I to III of the periodic table while feeding the catalyst-containing polymer formed in the first zone to the second zone; characterised by: (i) providing in a feed passage for feeding the polymer from the first zone to the second zone a suspension zone for forming a suspension of the polymer from the first zone in an easily volatile hydrocarbon medium which is liquid under the conditions of feeding the polymer; and (ii) feeding the suspension of the polymer in said liquid medium formed in the suspension zone to the second zone.
Claim 3
Dependent Claim
42 words
A process according to claim 1, wherein the multi-step gas-phase polymerization is carried out in the presence of hydrogen in the first and second zones, and'the hydrogen/olefin molar ratio in the second zone is maintained lower than that in the first zone.
Claim 4
Dependent Claim
32 words
A process according to claim 1 or 2, wherein the easily-volatile hydrocarbon medium is a non-polymerizable hydrocarbon capable of being gasified in the second zone, an olefin, or a mixture of these.
Claim 5
Dependent Claim
20 words
A process according to claim 3, wherein the non-polymerizable hydrocarbon is a non-polymerizable hydrocarbon having 3 to 5 carbon atoms.
Claim 6
Dependent Claim
35 words
A process according to any one of the preceding claims, wherein the suspension of the polymer in the said liquid medium contains 10 to 1,000 g of the polymer per liter of said liquid medium.
Claim 7
Dependent Claim
41 words
A process according to any one of the preceding claims, wherein the multi-step gas-phase polymerization is carried out at a temperature of from room temperature to 130°C and a pressure of from atmospheric pressure to 150 kg/cm 2 . G .
Claim 8
Dependent Claim
42 words
A process according to any one of the preceding P. claims, wherein the suspension of the polymer in said liquid medium is formed at a temperature of 0 to 100°C and a pressure of from atmospheric pressure to 50 kg/cm 2 .G.
Claim 9
Dependent Claim
53 words
A process according to any one of the preceding claims, wherein the catalyst is composed of a highly active transition metal component capable of forming at least 5000 g of an olefin polymer per millimole of the transition metal under the polymerization conditions in the first-step gas-phase polymerization zone, and an organoaluminum compound.
Claim 10
Dependent Claim
23 words
A process according to claim 8, wherein the highly active transition metal compound is a component consisting essentially of titanium, magnesium and halogen.
Claim 11
Dependent Claim
72 words
A process according to any one of the preceding claims, wherein the multi-step gas-phase polymerization is carried out by using 0.0005 to 1 millimole as the transition metal of the transition metal catalyst component per liter of the fluidized bed in each gas-phase polymerization zone, and the amount of the organometallic compound is such that the atomic ratio of themetal of the organometallic compound to the transition metal is 1:1 to 2000:1.
References Cited (Backward Citations)
US3922322A
Cited
US4048412A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.