Patent application number | Description | Published |
20080197086 | Assembly for the Treatment of a Polymerizable Material - The present invention relates to an arrangement ( | 08-21-2008 |
20080287616 | Process for Production of (Meth)Acrylic Acid with High Boiling Fraction Work-Up By Means of Crystallization - A process for production of (meth)acrylic acid is disclosed. The process includes synthesizing and distillatively working-up a crude (meth)acrylic acid phase to obtain a (meth)acrylic acid phase and a dimer phase including (meth)acrylic acid dimers and/or (meth)acrylic acid oligomers. At least a part of the (meth)acrylic acid dimers and/or of the (meth)acrylic acid oligomers from the dimer phase is split to obtain a (meth)acrylic acid including a low-boiling phase and a high-boiling phase including less (meth)acrylic acid than the low-boiling phase. At least a part of the (meth)acrylic acid from the low-boiling phase is separated by forming of one or more crystals to obtain a pure (meth)acrylic acid and a residue. Also disclosed is a device for production of (meth)acrylic acid, a process for production of a polymer as well as chemical products based on or including (meth)acrylic acid or a polymer as well as the use of (meth)acrylic acid or polymers in chemical products. | 11-20-2008 |
20090023006 | WATER-ABSORBENT POLYMER STRUCTURES BASED ON RENEWABLE RESOURCES AND METHOD FOR PRODUCING SAID STRUCTURES - The present invention relates to a process for the production of polymers, such as water-absorbing polymer structures, by radical polymerization of acrylic acid, whereby the acrylic acid has been obtained by a synthesis process which comprises as a process step the splitting of an organic material by means of an enzyme or at least one component of an enzyme. The invention also relates to the water-absorbing polymers obtainable by this process, water-absorbing polymers which are based to at least about 25 wt % upon partially neutralized acrylic acid, a composite, a process for the production of a composite, the composite obtainable by this production, the use of acrylic acid in the production of polymers, preferably in the production of water-absorbing polymer structures, a device for the production of acrylic acid, and a process for the production of acrylic acid. | 01-22-2009 |
20090068440 | PRODUCTION OF ACROLEIN, ACRYLIC ACID AND WATER-ABSORBENT POLYMER STRUCTURES MADE FROM GLYCERINE - The present invention relates to a process for the production of acrolein, comprising the following steps:
| 03-12-2009 |
20090134357 | ACRYLIC ACID, WATER-ABSORBENT POLYMER STRUCTURES BASED ON RENEWABLE RESOURCES AND METHOD FOR PRODUCING SAID STRUCTURES - The present invention relates to a process for production of acrylic acid, comprising at least the following steps:
| 05-28-2009 |
20090239995 | ACRYLIC ACID AND WATER-ABSORBING POLYMER STRUCTURES BASED ON RENEWABLE RAW MATERIALS AND PROCESS FOR THEIR PRODUCTION BY DEHYDRATION - The present invention relates to a process for production of acrylic acid, comprising the steps of a) dehydration of glycerine to an acrolein-comprising dehydration product; b) gas phase oxidation of the dehydration product to obtain an acrylic acid-comprising monomer gas; c) bringing into contact of the monomer gas with a quench agent to obtain an acrylic acid-comprising quench phase; and d) work-up of the quench phase to obtain an acrylic acid-comprising monomer phase; whereby, during the dehydration a liquid phase a | 09-24-2009 |
20090281263 | DEVICE AND METHOD FOR PRODUCING ACRYLIC ACID WITH A REDUCED AUTOXIDATION TENDENCY - The present invention relates to a device for the preparation of acrylic acid, comprising a first reactor and at least one further reactor, wherein at least the first reactor is a multi-tube reactor having a plurality of tubes comprising a catalyst which catalyses the synthesis of acrolein, wherein the tubes open into a collection chamber which can be fluidically connected to the at least one further reactor via an outflow region, wherein the outflow region comprises a laminarization means causing laminarization of a flow profile of a gas flowing through the outflow region. The invention also relates to a process for the preparation of acrylic acid, to an acrylic acid, to a process for the preparation of a hydrophilic polymer, to a hydrophilic polymer, to a method for the production of a water-absorbent hygiene article, to chemical products, and to the use of an acrylic acid. | 11-12-2009 |
20120226003 | SUPERABSORBENT POLYMERS AND METHODS OF MAKING THE SAME - In some embodiments, a process for producing a polymer comprises (I) producing a pure (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 or (meth)acrylic acid oligomers or both; (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 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 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. | 09-06-2012 |
20130072645 | SUPERABSORBENT POLYMERS AND METHODS OF MAKING THE SAME - 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. | 03-21-2013 |