| 摘要 |
<p>The treatment of a reactor for the gas phase, slurry, solution or high pressure polymerization of ethylene, optionally with comonomers, with a gas comprising not less than 50 volume% hydrogen at a temperature greater than 185 C for time up to about 30 hours reduces any Fe3+ (e.g. hematite) to Fe2+ (e.g. magnetite). As Fe3+ is known to be a catalytic site for deposition of carbon based deposits. A pre start up treatment reduces fouling in the reactor.</p> |
