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Method for carrying out radical ethylene high-pressure polymerization while preventing undesired polymer deposits

  • US 20030008982A1
  • Filed: 07/31/2002
  • Published: 01/09/2003
  • Est. Priority Date: 02/16/2000
  • Status: Active Grant
First Claim
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1. A process for the polymerization or copolymerization of ethylenically unsaturated monomers in the presence of polymerization initiators which decompose to form free radicals in a continuously operated polymerization apparatus comprising a fresh gas feed line (a), a precompressor (b), a postcompressor (c), a reactor (e), a pressure maintenance valve (f), a high-pressure circuit (g) having a high-pressure product separator (i) and a high-pressure circulation gas return line (l), a product valve (m) and a low-pressure circuit (n) having a low-pressure product separator (o) and a low-pressure circulation gas return line (q), wherein nitrogen monoxide or oxygen is introduced as inhibitor into the high-pressure circuit (g), into the low-pressure circuit (n) and/or the precompressor (b).

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