公开(公告)号：DE102005012480A1

公开(公告)日：2006-09-21

申请号：DE102005012480

申请日：2005-03-16

Applicant: BASF AG

Inventor： ASMANN JENS ,  ZOELLNER KNUT ,  BLINZLER MARKO ,  URTEL MELANIE ,  SCHWITTAY CLAUDIUS

IPC: C08G2/28 ,  C08G2/18

Abstract: Process for removing unconverted residual monomers from polyoxymethylenes, wherein a devolatilization step is carried out in an extrudate devolatilizer.

公开(公告)号：DE102005004855A1

公开(公告)日：2006-08-03

申请号：DE102005004855

申请日：2005-02-01

Applicant: BASF AG

Inventor： RYLANDER JESSICA ,  ZOELLNER KNUT ,  BLINZLER MARKO ,  URTEL MELANIE ,  ASMANN JENS

IPC: C08G2/28 ,  B01J21/16 ,  B01J23/85 ,  C07C47/045 ,  C08G2/08 ,  C08G65/46

Abstract: Removing non-reacted formaldehyde oligomer containing monomer residue and polyoxymethylene homo- or -copolymer comprises: drawing-off the monomer residue from gaseous polymer, in a degassing device; and contacting the residue with a catalyst exhibiting acid group and at which the formaldehyde oligomer is transferred to monomer formaldehyde (where the pressure in the contacting step is less than or equal to the pressure in the drawing step). Independent claims are included for: (1) the preparation of polyoxymethylene homo- or -copolymers comprising producing or retaining the monomer in a monomer plant; polymerizing the monomer in the polymerization reactor to give polymers; and removing the monomer residue in the polymer, during or after polymerization, by the above method; and (2) a polyoxymethylene homo- or -copolymers obtained by the process.

公开(公告)号：DE102005002413A1

公开(公告)日：2006-07-27

申请号：DE102005002413

申请日：2005-01-18

Applicant: BASF AG

Inventor： ZOELLNER KNUT ,  RYLANDER JESSICA ,  ASMANN JENS

IPC: C08G2/28

公开(公告)号：DE502005001905D1

公开(公告)日：2007-12-20

申请号：DE502005001905

申请日：2005-05-17

Applicant: BASF AG

Inventor： SCHWITTAY CLAUDIUS ,  STOECKELMANN ELMAR ,  HEINEMANN JOHANNES ,  ZOELLNER KNUT ,  STAMMER ACHIM

IPC: C08G2/10 ,  C08G2/08 ,  C08J11/02 ,  C08L59/00

Abstract: A process for removing residual monomers from polyoxymethylene homo- or copolymers, comprising the following process steps: a) the residual monomers are removed in gaseous form as vapors from the polymer in a devolatilization apparatus, b) the residual monomer vapors are removed through a vapor pipe, c) the residual monomers are condensed from the vapors in a condensation apparatus at from 1.09 to 102.4 bar and from 102 to 230° C., the temperature not falling below 102° C. at any point of the condensation apparatus, and those surfaces of the condensation apparatus which come into contact with the vapors being coated with a liquid film of condensed residual monomers.

公开(公告)号：DE102005015984A1

公开(公告)日：2006-10-12

申请号：DE102005015984

申请日：2005-04-07

Applicant: BASF AG

Inventor： HELWIG EKATERINA ,  SEIDL VOLKER ,  ZOELLNER KNUT ,  STAMMER ACHIM

IPC: C08G2/08 ,  C08G2/10 ,  C08G2/18

Abstract: Preparation of an oxymethylene homo- and/or copolymer (A) comprises spray polymerizing formaldehyde monomer or cyclic formaldehyde oligomer (preferably trioxane), and optionally an anionic or cationic co-monomer initiator in a reactor.