Manufacture of butyl rubber

Details Manufacture of butyl rubber Manufacture of butyl rubber

1986-06-16

1987-12-22

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in tubular or loop reactor

526 88, 526185, 526339, 422137, C08F 214, C08F23604

Patent

active

047147474

ABSTRACT:
The invention relates to a continuous process for the manufacture of butyl rubber in which the monomers are polymerized using a halogenated polymerization 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.degree. C.). In contrast to prior art slurry processes, the polymerization mixture forms a sticky, highly viscous mass which is conveyed by screw action to the extruder outlet as polymerization proceeds. The butyl rubber product is separated at a high concentration from vapors of unreacted monomers and polymerization medium which are recycled. Cooling is effected by vaporization of a portion of the mixture of monomers and polymerization medium in a flash tank before supply to the extruder and returning the vaporized fraction and recycle vapors 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.

REFERENCES:
patent: 2494588 (1950-01-01), Skooglund
patent: 3522214 (1970-07-01), Crawford et al.
patent: 3536680 (1970-10-01), Illing

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