Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Patent
1989-10-16
1993-08-10
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in two or more physically distinct zones
526 88, C08F 234
Patent
active
052350096
ABSTRACT:
Processes are disclosed for the vapor phase polymerization of gaseous monomers, particularly olefins such as propylene and ethylene. A gaseous stream containing at least one gaseous monomer is passed upwardly through a series of fluidized bed reaction zones of successively smaller diameter. A polymerization catalyst is introduced into an uppermost one of said zones. The gaseous monomer is polymerized to form solid polymer particles which are a part of a fluidized bed in each zone, and which flow downwardly through the series of reaction zones, thereby decreasing a volumetric flow rate of the upwardly flowing gaseous stream as the stream moves upward. A velocity of the upwardly flowing gaseous stream is maintained at a sufficient level to fluidize the fluidized bed in each successive zone at least partially by means of the smaller diameter of each successive zone. Techniques are disclosed for dividing zones into subzones thus multiplying the effective number of stages of the reactor.
REFERENCES:
patent: 2467802 (1949-04-01), Barr
patent: 2596611 (1952-05-01), Weidman et al.
patent: 2749218 (1956-06-01), Heath
patent: 2799558 (1957-07-01), Smith et al.
patent: 2936303 (1960-05-01), Goins
patent: 3079222 (1963-02-01), Reeve
patent: 3625932 (1971-12-01), Green
patent: 3770714 (1973-11-01), Dorschner et al.
patent: 3776979 (1973-12-01), Hill
patent: 3910769 (1975-10-01), Mayer et al.
patent: 3931134 (1976-01-01), Hartmann et al.
patent: 4003712 (1977-01-01), Miller
patent: 4380615 (1983-04-01), Sauerbrunn
patent: 4703094 (1987-10-01), Raufast
patent: 4710538 (1987-12-01), Jorgensen
Applied Industrial Catalysis, vol. 1, pp. 164-166, Bruce E. Leach, Ed., Academic Press, 1983.
Phillips Petroleum Company
Schofer Joseph L.
Weber T. R.
LandOfFree
Gas phase polymerization in multi-stage fluid beds does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas phase polymerization in multi-stage fluid beds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas phase polymerization in multi-stage fluid beds will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1726120