Patent application number | Description | Published |
20080281124 | 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 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 | 11-13-2008 |
20090203938 | USE OF PHOSPHORIC ESTERS AS DEPOSIT CONTROL AGENTS DURING THE SYNTHESIS, PURIFICATION OR REGENERATION OF (METH)ACRYLIC MONOMERS - The compounds of formula (I) are provided as deposition inhibitors which prevent the deposition of compounds of polymeric nature or resulting from addition reactions to (meth)acrylic double bonds during operations for the synthesis or purification or regeneration of (meth)acrylic monomers. | 08-13-2009 |
20120108767 | METHOD FOR PRODUCING BIO-RESOURCED POLYMER-GRADE 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. | 05-03-2012 |
20120178965 | METHOD FOR PRODUCING BIORESOURCED ACRYLIC ACID FROM GLYCEROL - 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. | 07-12-2012 |
20120190890 | METHOD FOR PRODUCING BIORESOURCED ACRYLIC ACID FROM GLYCEROL - 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, corresponding to a degree of purity corresponding to the requirements of the users. | 07-26-2012 |
20120302797 | PROCESS FOR MANUFACTURING ACROLEIN AND/OR 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. | 11-29-2012 |
20130165690 | METHOD FOR MANUFACTURING POLYMER-GRADE BIO-BASED ACRYLIC ACID FROM GLYCEROL - The present invention relates to a process for the manufacture of hioresourced acrylic acid of polymer grade having a content by weight of acrylic acid greater than 99% and the following contents of impurities: protoanemonin less than 5 ppm, total aldehydes less than 10 ppm, maleic anhydride less than 30 ppm, nonphenolic polymerization inhibitors less than 10 ppm, and a content by weight of | 06-27-2013 |
20150087861 | METHOD FOR PRODUCING ACROLEIN AND/OR ACRYLIC ACID FROM GLYCEROL - 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. | 03-26-2015 |