Method for producing polyoxymethylenes
AssigneeBASF SE
InventorsJens Assmann, Knut Zollner, Johannes Heinemann, Elmar Stockelmann, Achim Stammer
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Abstract
Process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b), and also, if appropriate, in the presence of regulators c), and subsequent deactivation and isolation of the polymer, which comprises undertaking the polymerization in a tubular reactor with static mixing elements and with a mixing zone, a polymerization zone, and a deactivation zone, the diameter of the tubular reactor in the mixing zone being <90% of the diameter in the polymerization zone.
Claims18
A process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b), and also, if appropriate, in the presence of regulators c), and subsequent deactivation and isolation of the polymer, which comprises undertaking the polymerization in a tubular reactor with static mixing elements and with a mixing zone, a polymerization zone, and a deactivation zone, the entire diameter of the tubular reactor in the mixing zone being <90% of the entire diameter in the polymerization zone and the entire diameter of the deactivation zone of the reactor being <95% of the entire diameter of the polymerization zone.
A process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b), and also, if appropriate, in the presence of regulators c), and subsequent deactivation and isolation of the polymer, which comprises undertaking the polymerization in a tubular reactor with static mixing elements and with a mixing zone, a polymerization zone, and a deactivation zone, the entire diameter of the tubular reactor in the mixing zone being <90% of the entire diameter in the polymerization zone and the entire diameter of the deactivation zone of the reactor being <95% of the entire diameter of the polymerization zone, wherein the deactivation zone comprises from 1 to 5 sections;
- wherein the entire diameter of the smallest section in the deactivation zone is from 30 to 95% of the entire diameter of the largest section and wherein a number of fillets in the static mixing elements in the deactivation zone is from 20 to 500% higher than in the polymerization zone.
Dependencies are inferred from the claim text.