Claims
- 1. A gas phase fluidized bed reactor, comprising:
- an upright tubular portion;
- a fluidization grid provided in a lower part of said tubular portion;
- a lower orifice and an upper orifice in said upright tubular portion, said lower orifice being above said fluidization grid, said upper orifice being above said lower orifice; and
- external conduit means connecting said lower and upper orifices for circulating polymer exiting said tubular portion through said lower orifice and entering said tubular portion through said upper orifice.
- 2. A reactor according to claim 1, wherein said external conduit means is equipped with isolation means for isolating said external conduit means from said reactor.
- 3. A reactor according to claim 2, wherein said isolation means comprises a lower valve which is positioned in said external conduit means towards said lower orifice and an upper valve positioned towards said upper orifice.
- 4. A reactor according to claim 1, wherein said external conduit means is equipped with a means for withdrawing polymer from said external conduit means.
- 5. A reactor according to claim 1, wherein said external conduit means is equipped with feed conduits.
- 6. A reactor according to claim 1, wherein a part of said external conduit means extends below said lower orifice.
Priority Claims (2)
Number |
Date |
Country |
Kind |
92 09063 |
Jul 1992 |
FRX |
|
92 09064 |
Jul 1992 |
FRX |
|
Parent Case Info
This is a Rule 60 Divisional of application Ser. No. 08/092,809, filed 16 Jul. 1993, now U.S. Pat. No. 5,434,228.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4003712 |
Miller |
Jan 1977 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2137441 |
Dec 1972 |
FRX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
92809 |
Jul 1993 |
|