Arkema France

Elf Atochem S.a.

Atofina

Arkema Inc.

Michel Fauconet

Jean-Francois Devaux

Denis Laurent

Marc Esch

Christian Lacroix

Jacqueline Bessalem

Sandeep Jain

Stephane Lepizzera

Nathalie Hess

Serge Tretjak

Roger L Roundy

Jean-François Devaux

Nabil Tlili

Norbert Richard

Mireille Stojanovic

Stephane Denis

Yves Samuel

Samuel Marc Daniel

Nadine Colin

Patrick Delafin

Gullu Isik

Jean-Marie Destenay

Francis Augustin

Jean-Paul Combet

Philippe Haller

Stephen Tlatlik

Frédéric Sandre

Samuel Daniel

The present invention relates to a process for the treatment of wastewater containing formaldehyde. In particular, the invention relates to a process for the treatment of liquid effluents resulting from the manufacture of acrylic acid or acrolein, which is targeted at removing the formaldehyde present in these effluents. Finally, the invention relates to the use of the purified aqueous solution thus obtained in process for the production of acrylic acid by catalytic oxidation of propylene and/or propane.

Elimination of formaldehyde in wastewater through oxidation treatment

A process for the recovery of polymer-grade (meth)acrylic acid, in the absence of organic solvent, from a gaseous reaction mixture comprising (meth)acrylic acid obtained by gas-phase oxidation of a precursor of the (meth)acrylic acid, the process carried out in a plant comprising at least one dehydration column and one finishing column, being characterized by the presence of at least one chemical treatment agent targeted at reducing the content of residual aldehydes. (Meth)acrylic acid obtained according to the invention meets criteria of high quality allowing it to be used in the manufacture of acrylic polymers, in particular for superabsorbents. This grade is also known as glacial acrylic acid GAA.

Process for producing polymer-grade (meth)acrylic acid

The invention relates to the use of a column with a separating wall as a purification/finishing column in a (meth)acrylic acid recovery method based on the use of two distillation columns in the absence of external organic solvent. The method according to the invention improves the energy balance for the method while improving the technical quality of the (meth)acrylic acid recovered. The method according to the invention further produces polymer-grade (or glacial) (meth)acrylic acid compatible with the production of high-molecular weight acrylic acid polymers.

Process for purifying (meth)acrylic acid including a dividing-wall distillation column

The invention relates to the production of acrolein and/or acrylic acid from glycerol, and more particularly to a method for continuous production of a stream comprising acrolein by dehydration of glycerol, comprising cycles of reaction and regeneration of a dehydration catalyst.

Method for producing acrolein and/or acrylic acid from glycerol

The invention is directed to a process for recovering/purifying (meth)acrylic acid which does not use azeotropic solvent and is based on the use of two columns for purifying a reaction mixture comprising (meth)acrylic acid. The process according to the invention includes a dry vacuum pump condensation system, which makes it possible to reduce the amount of final aqueous discharges.

Process for producing (meth)acrylic acid

The present invention relates to the manufacture of biobased acrylic acid from glycerol as starting material, the term 'biobased acid' indicating that the acrylic acid is essentially based on a carbon source of natural origin.

Method for the production of bio-sourced acrylic acid

The present invention relates to methods by which the thermal dissociation of Michael adducts present in a stream of crude acrylic acid, called 'crude ester grade', and the esterification reaction of acrylic acid present in the stream of crude acrylic acid, or generated in situ by thermal dissociation, with a light alcohol, are carried out simultaneously.

Method for continuous production of light acrylates by esterification of a raw ester-grade acrylic acid

An aim of the present invention is to produce, from glycerol, a bioresourced acrylic acid, that is to say an acrylic acid essentially based on a carbon source of natural origin, meeting all the quality criteria of monomers customarily used as starting material in processes for polymerization of acrylic acid and of its esters, via an economical process. The process according to the invention comprises a final stage of extraction of acrylic acid by fractional crystallization applied to one of the effluents resulting from the acrylic acid purification chain, the location of this final stage possibly depending on the initial feedstock treated, the nature and the source of the glycerol used in the process, purity specifications to be achieved for the final acrylic acid, or finally economic criteria.

Method for producing bioresourced acrylic acid from glycerol

The present invention relates to the manufacture of bioresourced polymer-grade acrylic acid from glycerol. The polymer grade acrylic acid produced has limited content of certain impurities harmful to polymerization processes, such as, total aldehydes, protoanemonin, maleic anhydride and nonphenolic polymerization inhibitors. The invention also relates to the use of the bioresourced acrylic acid obtained for manufacture of superabsorbents or for manufacture of polymers or copolymers using amide or ester derivatives of the bioresourced acrylic acid.

Process for producing bio-resourced polymer-grade acrylic acid from glycerol

The present invention relates to the manufacture of bioresourced acrolein and bioresourced acrylic acid from glycerol as starting material and more particularly comes within the scope of a process for the manufacture of acrolein and acrylic acid according to which the reaction for the dehydration of glycerol to give acrolein is carried out and a stage of oxidizing a water-rich phase separated from the reaction mixture coming from this dehydration reaction is carried out, before it is recycled to the glycerol dehydration stage. This oxidation treatment prevents organic impurities from accumulating during the process, while minimizing the consumption of water and the discharge of polluted aqueous streams.

Process for manufacturing acrolein and/or acrylic acid from glycerol

The present invention relates to a method for purifying (meth)acrylic acid obtained by catalytic or redox oxidation of a gaseous substrate constituting propane, propylene, acrolein, isobutane, isobutene, tert-butyl alcohol and/or (meth)acrolein or mixtures thereof by sending the gaseous reaction mixture to the bottom of a countercurrent absorption column (C) which is supplied at the top with at least one type of hydrophobic heavy solvent, sending the flow () from the bottom of column (C) to a separation column (C). Column (C) is operated at a flow rate of heavy solvent of from 3 to 5.6 times the flow rate of the (meth)acrylic acid in the gaseous reaction mixture and the rectifying column used as a separation column (C) is operated with the feed at the top and without reflux.

Method for purifying (meth)acrylic acid obtained by oxidizing a gaseous substrate

The present invention relates to a method for purifying (meth)acrylic acid obtained by oxidizing propane, propylene, acrolein, isobutane, isobutene, ter-butyl alcohol, (meth)acrolein and mixtures thereof by sending the gaseous reaction mixture to the bottom of a countercurrent absorption column (C) which is supplied at the top with at least one type of hydrophobic heavy solvent, sending the flow () from the bottom of column (C) to a light component separation column (C) and sending the flow from the base of column (C), stream (4) to a separation device made up of three sections, exhaustion (S), concentration (S) and rectification (S) respectively in order to extract pure (meth)acrylic acid.'

Method for purifying (meth)acrylic acid by oxidising a gaseous substrate

The invention concerns a method of purifying a (meth) acrylic monomer selected among (meth) acrylic acids and their esters, by distillation in the presence of at least a polymerisation inhibitor requiring input of oxygen and/or an inhibitor having better efficacy in the presence of oxygen for stabilizing the liquid phase. The invention is characterized in that the distillation is performed in the presence of a NOgas, with an oxygen/organic vapor (p/p) ratio ranging between 0.02 and 3%, and with a NOcondensed organic vapor (p/p) ratio ranging between 0.01 and 50 ppm.

Method for purifying (meth)acrylic monomers by distillation

The gas reaction mixture (), formed of propylene, if the case arises, of ultimate oxidation products, of acrylic acid, of acrolein, of steam, of acetic acid and of heavy products, is sent to the bottom of an absorption column (C) fed countercurrentwise at the top with a heavy hydrophobic absorption solvent. The gas flow (), formed of propylene and of ultimate oxidation products, of major amounts of water and acetic acid, and of acrolein, is obtained at the top of (C) and a flow (), formed of acrylic acid, of the heavy solvent, of heavy products and of minor amounts of acetic acid and of water, is obtained at the bottom of (C). The flow () is sent to a heat exchanger (C), where it is brought into contact with a descending liquid stream (), fed at the top of (C), composed of the recycling of a portion of the flow (), cooled beforehand, from the bottom of (C), in order to obtain, at the top, a gas flow () comprising the compounds present in the flow (), except for most of the water and all the acetic acid, removed in the flow () from the bottom of (C).

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Valmont, France

Michel Fauconet