| 摘要 |
PURPOSE:To make it possible to control strictly polymerization temperature and produce easily a polyolefin having a constant molecular weight, by polymerizing an olefin while circulating a gas unliquefiable in the cooling part of a vapor phase part by a specific method. CONSTITUTION:An olefin is polymerized in a liquid hydrocarbon solvent having <=40 deg.C boiling point under ordinary pressure, e.g. propane, n-butane or butene-1, by cooling the vapor phase part with hydrogen as a molecular weight adjustor and removing the polymerization heat of the olefin utilizing the latent heat of vaporization of the above-mentioned hydrocarbon solvent. In the process, a gas unliquefiable in the cooling part 3 of the vapor phase part is introduced into the suction part of an ejector 9, and the above-mentioned hydrocarbon solvent preferably as a polymerization slurry is introduced into the suction nozzle of the ejector 9. Preferably, the polymerization temperature is adjusted to 45-85 deg.C, and the pressure is adjusted to 10-50kg/cm<2> gauge.
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