公开(公告)号：US20130072645A1

公开(公告)日：2013-03-21

申请号：US13668899

申请日：2012-11-05

Applicant: Evonik Stockhausen GmbH

Inventor： Torsten Balduf ,  Gunther Bub ,  Jurgen MOSLER ,  Andreas Sabbagh ,  Jurgen Kohn ,  Arndt Selbach

IPC: C08J3/00

CPC classification number: C08J3/00 ,  C07C51/43 ,  C07C57/04

Abstract: The invention relates to producing a superabsorbent polymer comprising (I) producing a (meth)acrylic acid comprising the steps of (a) synthesizing a crude (meth)acrylic acid phase; (b) distillatively working-up the crude (meth)acrylic acid phase to obtain a (meth)acrylic acid phase and a dimer phase comprising (meth)acrylic acid dimers and/or (meth)acrylic acid oligomers; (c) splitting at least a part of the (meth)acrylic acid dimers or of the (meth)acrylic acid oligomers or both from the dimer phase to obtain a (meth)acrylic acid-comprising a low boiling phase and a high boiling phase comprising less (meth)acrylic acid than the low boiling phase; (d) separating at least a part of the (meth)acrylic acid from the low boiling phase by forming crystals to obtain a pure (meth)acrylic acid, and a residue; (II) polymerizing a monomer phase comprising the pure (meth)acrylic acid to obtain a polymer phase; and (III) working-up the polymer phase to obtain the polymer.

Abstract translation: 本发明涉及制备超吸收性聚合物，其包括（I）生产（甲基）丙烯酸，其包括以下步骤：（a）合成粗制（甲基）丙烯酸相; （b）蒸馏处理粗（甲基）丙烯酸相以获得（甲基）丙烯酸相和包含（甲基）丙烯酸二聚体和/或（甲基）丙烯酸低聚物的二聚体相; （c）从二聚体相分解至少一部分（甲基）丙烯酸二聚体或（甲基）丙烯酸低聚物或两者，得到包含低沸点相和高沸点相的（甲基）丙烯酸 包括比低沸点相少的（甲基）丙烯酸; （d）通过形成晶体从低沸点相分离出至少一部分（甲基）丙烯酸，得到纯的（甲基）丙烯酸和残余物; （II）使包含纯（甲基）丙烯酸的单体相聚合以获得聚合物相; 和（III）加工聚合物相以获得聚合物。