| Patent application number | Description | Published |
|---|
| 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 |
| 20110105791 | PROCESS FOR PREPARING ACRYLIC ACID PURIFIED BY CRYSTALLIZATION FROM HYDROXYPROPIONIC ACID AND APPARATUS THEREFORE - The invention relates to a process for the preparation of acrylic acid and a process for the preparation of polyacrylic acid comprising the process steps: (a1) preparation of 3-hydroxypropionic acid from a biological material to give a fluid, in particular aqueous, phase containing 3-hydroxypropionic acid; (a2) dehydration of the 3-hydroxypropionic acid to give a fluid, in particular aqueous, solution containing acrylic acid; (a3) purification of the solution containing acrylic acid by a suspension crystallization or a layer crystallization to give a purified phase; and corresponding devices for carrying out these processes, and acrylic acid and polyacrylates. The invention is distinguished in that acrylic acid and polyacrylates can thereby be prepared efficiently, inexpensively, and sustainably with simple means and with a high purity on the basis of regenerable raw materials. | 05-05-2011 |
| Patent application number | Description | Published |
|---|
| 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 |
| 20110105791 | PROCESS FOR PREPARING ACRYLIC ACID PURIFIED BY CRYSTALLIZATION FROM HYDROXYPROPIONIC ACID AND APPARATUS THEREFORE - The invention relates to a process for the preparation of acrylic acid and a process for the preparation of polyacrylic acid comprising the process steps: (a1) preparation of 3-hydroxypropionic acid from a biological material to give a fluid, in particular aqueous, phase containing 3-hydroxypropionic acid; (a2) dehydration of the 3-hydroxypropionic acid to give a fluid, in particular aqueous, solution containing acrylic acid; (a3) purification of the solution containing acrylic acid by a suspension crystallization or a layer crystallization to give a purified phase; and corresponding devices for carrying out these processes, and acrylic acid and polyacrylates. The invention is distinguished in that acrylic acid and polyacrylates can thereby be prepared efficiently, inexpensively, and sustainably with simple means and with a high purity on the basis of regenerable raw materials. | 05-05-2011 |
| 20110144294 | 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 at least the following steps:
| 06-16-2011 |
