Title:
METHOD FOR PRODUCING WATER-ABSORBENT RESINS
Document Type and Number:
WIPO Patent Application WO2003014172
Kind Code:
A3
Abstract:
The invention relates to a method for producing acrylic acid-based water-absorbent resins. Crude acrylic acid is first isolated from the reaction gases of the catalytic gas phase reaction of propane, propene, and/or acrolein. Said crude acrylic acid is treated with an aldehyde scavenger and pure acrylic acid is separated by distillation from the treated crude acrylic acid. The pure acrylic acid can then be immediately subjected to radical polymerisation.
Inventors:
FUCHS EBERHARD (DE)
MARTAN HANS (DE)
NESTLER GERHARD (AT)
MUELLER-ENGEL KLAUS JOACHIM (DE)
MARTAN HANS (DE)
NESTLER GERHARD (AT)
MUELLER-ENGEL KLAUS JOACHIM (DE)
Application Number:
PCT/EP2002/008646
Publication Date:
November 27, 2003
Filing Date:
August 02, 2002
Export Citation:
Assignee:
BASF AG (DE)
FUCHS EBERHARD (DE)
MARTAN HANS (DE)
NESTLER GERHARD (AT)
MUELLER-ENGEL KLAUS JOACHIM (DE)
FUCHS EBERHARD (DE)
MARTAN HANS (DE)
NESTLER GERHARD (AT)
MUELLER-ENGEL KLAUS JOACHIM (DE)
International Classes:
C07C51/215; C07C51/235; C07C51/25; C07C51/43; C07C51/44; C07C51/487; (IPC1-7): C07C51/25; C07C51/215; C07C51/235; C07C51/43; C07C51/487; C07C51/44; C07C57/05; C07C57/07; C07C57/075; C08F220/00
Foreign References:
| US3868417A | 1975-02-25 | |||
| US5426221A | 1995-06-20 | |||
| DE19634614A1 | 1998-03-05 | |||
| US5482597A | 1996-01-09 | |||
| FR2753445A1 | 1998-03-20 | |||
| EP0770592A1 | 1997-05-02 |
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