Abstract: The present invention relates to a process for production of acrylic acid, comprising at least the following steps: a. dehydrating glycerine to a dehydration product comprising acrolein; b. gas phase oxidation of the dehydration product comprising acrolein to obtain a monomer gas comprising an acrylic acid; c. bringing into contact the monomer gas with a quench means to obtain a quench phase comprising acrylic acid; and d. processing the quench phase comprising acrylic acid to obtain a monomer phase comprising acrylic acid. The present invention may also relate to a process for preparation of polymers by radical polymerization of acrylic acid, the water-absorbing polymers obtainable by this process, water-absorbing polymers based to at least 25 wt % upon partially neutralized acrylic acid, a composite, a device for preparation of acrylic acid, a process for preparation of acrylic acid, and the acrylic acid obtainable by this process.

Abstract: The present invention relates to a process for the production of acrolein, comprising the following steps: (a) bringing into contact of an aqueous glycerine phase in an acrolein reaction area to obtain an aqueous acrolein reaction phase; (b) depleting the acrolein from the acrolein reaction phase to obtain an acrolein phase and a depleted acrolein reaction phase; (c) conducting back at least a part of the depleted acrolein reaction phase into the acrolein reaction area. The invention further relates to a process for production of acrylic acid as well as of water-absorbing polymer structures, composites, in particular hygiene articles, comprising these water-absorbing polymer structures, a process for production of the composites and further chemical products based on the acrylic acid obtained by the inventive process and also the use of this acrylic acid in chemical products.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates the preparation of (meth)acrylic acid comprising the steps: i) bringing a composition Z1 comprising (meth)acrylic acid and aldehydes into contact with an aldehyde-trapping agent to give a composition Z2 comprising (meth)acrylic acid, the high-boiling reaction product of the aldehyde, and the aldehyde-trapping agent, and unreacted aldehyde-trapping agent; ii) separating off (meth)acrylic acid from the composition Z2 by means of distillation, whereby a composition Z3 comprising the high-boiling reaction product from the reaction between the aldehyde and the aldehyde-trapping agent and unreacted aldehyde-trapping agent is being obtained as the bottom product; iii) extracting the unreacted aldehyde-trapping agent from the composition Z3 by water, a first, aqueous phase P1 and a second, organic phase P2 being obtained; iv) separating off of the first, aqueous phase P1 from the second, organic phase P2.

Abstract: The present invention relates to a process for the production of acrylic acid (AA) comprising the steps wherein: a) a 1st gas mixture comprising propylene, oxygen, an inert gas and steam is subjected to a 1st catalytic oxidation reaction stage thereby converting the propylene in the presence of a catalyst mainly into acrolein being contained in a 2nd gas mixture from said 1st catalytic oxidation reaction, b) said 2nd gas mixture from the 1st catalytic oxidation reaction stage is subjected to a 2nd catalytic oxidation reaction stage thereby converting the acrolein in the presence of a catalyst mainly into AA, being contained in a product gas, c) said product gas is subjected to a quench tower, wherein said AA is recovered as an aqueous solution comprising said AA being contained in the process water, wherein a process vent gas is obtained at the top of said quench tower, wherein, said 1st gas mixture has a steam/propylene ratio of >0.

Abstract: The present invention relates to a process for the production of acrylic acid (AA) comprising the steps wherein: a) a 1st gas mixture comprising propylene, oxygen, an inert gas and steam is subjected to a 1st catalytic oxidation reaction stage thereby converting the propylene in the presence of a catalyst mainly into acrolein being contained in a 2nd gas mixture from said 1st catalytic oxidation reaction, b) said 2nd gas mixture from the 1st catalytic oxidation reaction stage is subjected to a 2nd catalytic oxidation reaction stage thereby converting the acrolein in the presence of a catalyst mainly into AA, being contained in a product gas, c) said product gas is subjected to a quench tower, wherein said AA is recovered as an aqueous solution comprising said AA being contained in the process water, wherein a process vent gas is obtained at the top of said quench tower, wherein, said 1st gas mixture has a steam/propylene ratio of >0.