公开(公告)号：US08481784B2

公开(公告)日：2013-07-09

申请号：US13630302

申请日：2012-09-28

Applicant: Evonik Stockhausen GmbH

Inventor： Franz-Felix Kuppinger ,  Axel Hengstermann ,  Guido Stochniol ,  Gunther Bub ,  Jurgen Mosler ,  Andreas Sabbagh

IPC: C07C51/42

CPC classification number: C08F120/06 ,  C07C51/377 ,  C07C51/43 ,  Y02P20/127 ,  C07C57/04

Abstract: In one aspect, a process for the preparation of a superabsorbent polymer is described herein. In some embodiments, the process comprises (I) preparing acrylic acid, wherein the process comprises (a1) provision of a fluid F1 having a composition comprising from about 5 to about 20 wt. % of hydroxypropionic acid, salts thereof, or mixtures thereof; from about 0.1 to about 5 wt. % of inorganic salts; from about 0.1 to about 30 wt. % of organic compounds which differ from hydroxypropionic acid; from 0 to about 50 wt. % of solids; and from about 20 to about 90 wt. % of water; (a2) dehydration of said hydroxypropionic acid to give a fluid F2 containing acrylic acid; and (a3) purification of said fluid F2 to give a purified acrylic acid phase comprising acrylic acid having a purity of at least 70 wt. %; and (II) polymerizing the acrylic acid of (I) to form a superabsorbent polymer.

Abstract translation: 一方面，本文描述了制备超吸收性聚合物的方法。 在一些实施方案中，该方法包括（I）制备丙烯酸，其中该方法包括（a1）提供具有包含约5至约20wt。 ％的羟基丙酸，其盐或其混合物; 约0.1至约5wt。 ％的无机盐; 约0.1至约30wt。 ％羟基丙酸不同的有机化合物的％; 0至约50wt。 ％的固体; 和约20至约90wt。 ％的水; （a2）所述羟基丙酸的脱水，得到含有丙烯酸的流体F2; 和（a3）纯化所述流体F2以得到包含纯度至少为70重量％的丙烯酸的纯化丙烯酸相。 ％; 和（II）使（I）的丙烯酸聚合以形成超吸收性聚合物。

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。