Polymerization catalyst

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Removing and recycling removed material from an ongoing...

Reexamination Certificate

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Details

C526S901000, C422S131000, C422S139000, C422S132000

Reexamination Certificate

active

06887954

ABSTRACT:
The present invention is a process and an apparatus for the gas phase polymerization of olefin(s) using a fluidised-bed reactor (1) from which, at the top part, is withdrawn a recycling gas stream which comprises unreacted gas and entrained solid particles and which is moved by virtue of a compressor (4), which is cooled by passing into a heat exchanger (7) and which is reintroduced into the reactor at the bottom part (1a) of the latter. The heat exchanger (7) is a multitubular exchanger successively comprising an inlet chamber (6), a bundle of tubes (9) with a horizontal longitudinal axis and an outlet chamber (10) equipped with a discharge orifice (11). In the outlet chamber (10) the flow of the gas stream is accelerated up to the orifice (11) and is directed at any point in the said chamber along a horizontal axis and/or towards the bottom part (1a) of the said chamber, so as to create, in the bottom part of the said chamber, a sweeping stream which flows horizontally or with a downward inclination and without obstacle up to the orifice and which promotes the entrainment of the particles up to the orifice.

REFERENCES:
patent: 4588790 (1986-05-01), Jenkins et al.
patent: 1 005 993 (1957-04-01), None
patent: 0 042 892 (1982-01-01), None
A Private Multiclient Study: Polyolefins through the 80's—The continuing evolution, Polyolefin Technology Update, vol. TU II, Process Costs, Capabilities, Economics, Final Report. Jul. 1986. SRI International Multiclient Project N° 7892.

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