Claims
- 1. Apparatus for the gas-phase polymerization of α-olefins, comprising: a first vertical cylindrical reactor equipped with a catalyst feedline; and a second vertical cylindrical reactor equipped with a polymer discharge system; the upper region of said first reactor being connected by a first line to an inlet of a solid/gas separator which is in turn connected by its outlet for the solid to the upper region of said second reactor; the lower region of said second reactor being connected by a second line to the lower region of said first reactor; and said solid/gas separator being connected by means of a recirculation line for the gaseous mixture that enters said first reactor in a region at the bottom of said first reactor below and separate from the point of entry of said second line to the first reactor.
- 2. Apparatus according to claim 1, wherein said first reactor is equipped with gas distributor means located between the point of entry of said second line and said region at the bottom of said first reactor.
- 3. Apparatus according to claim 1, wherein a first control valve for controlling the polymer flow rate is interposed between said second reactor and said second line.
- 4. Apparatus according to claim 3, wherein said first valve is a mechanical valve.
- 5. Apparatus according to claim 3, wherein said first valve is a non-mechanical valve.
- 6. Apparatus according to claim 2, wherein said catalyst feedline is connected via a third line to said first reactor at a point above said gas distributor means.
- 7. Apparatus according to claim 1, wherein said recirculation line for the gaseous mixture is equipped with a compressor, a cooling system and systems for introducing monomers and molecular weight regulator.
- 8. Apparatus according to claim 1, wherein said first line leaves the upper region of said first reactor laterally.
- 9. Apparatus according to claim 1, wherein the upper region of said first reactor is of frustoconical geometry so that the end of larger diameter is oriented above the end of smaller diameter.
- 10. Apparatus according to claim 7, wherein said recirculation line for the gaseous mixture is connected, at a point downstream of said compressor, via a line to said second line.
- 11. Apparatus according to claim 1, wherein said first reactor is equipped with external cooling means.
Priority Claims (1)
Number |
Date |
Country |
Kind |
MI95A1562 |
Jul 1995 |
IT |
|
Parent Case Info
This is a divisional of U.S. application Ser. No. 08/684,411, filed Jul. 19, 1996 now U.S. Pat. No. 5,698,642.
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A |
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A |
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Aug 1999 |
A |