Manufacture of butyl rubber

Details Manufacture of butyl rubber Manufacture of butyl rubber

C - Chemistry, Metallurgy

08

F

402/461

C08F 210/12 (2006.01) B01J 8/10 (2006.01) C08F 2/00 (2006.01)

Patent

CA 1271896

Abstract The invention relates to a continuous process for the manufacture of butyl rubber in which the monomers are polymerised using a halogenated polymerisation medium in a self-cleaning screw extruder at a constant pressure under boiling plug-flow conditions by means of a modified aluminium halide catalyst which operates at high temperature (relative to prior art very low temperatures of e.g. -100°C). In contrast to prior art slurry processes ,the polymerisation mixture forms a sticky, highly viscous mass which is conveyed by screw action to the extruder outlet as polymerisation proceeds. The butyl rubber product is separated at a high concentration from vapours of unreacted monomers and polymerisation medium which are recycled. Cooling is effected by vapourisation of a portion of the mixture of monomers and polymerisation medium in a flash tank before supply to the extruder and returning the vapourised fraction and recycle vapours to the flash tank through, in succession, a compressor, heat exchanger and throttle valve. By using the process of the invention, the total energy consumption in butyl rubber manufacture can be cut to about 20% of that of prior art processes.

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