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Organic Compounds -- Part Of The Class 532-570 Series > Azo Compounds Containing Formaldehyde Reaction Product As The Coupling Component > Carboxylic Acids And Salts Thereof > Acyclic > Unsaturated > Purification Or Recovery Per Se Purification Or Recovery Per SePurification Or Recovery Per Se patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.01/18/07 - 20070015938 - Process for manufacturing high purity methacrylic acid A process is provided herein for the high yield production of high purity glacial methacrylic acid (“HPMAA”) that is substantially pure, specifically 99% pure or greater with a water content of 0.05% or less. This improved process comprises providing a crude MAA stream and purifying the crude methacrylic acid stream ... 01/11/07 - 20070010690 - Process for manufacturing high purity methacrylic acid A process is provided herein for the high yield production of high purity glacial methacrylic acid (“HPMAA”) that is substantially pure, specifically 99% pure or greater, with water content of 0.05% or less and low levels of other impurities, including HIBA, acrylic acid, MOMPA, methacrolein and others. This improved process ... 12/14/06 - 20060281947 - (meth) acrylic acid composition and method for producing the same The present invention removes impurities inhibiting storage stability of (meth)acrylic acid or stability in polymerization of (meth)acrylic acid when (meth)acrylic acid is used as a raw material, to thereby stabilize (meth)acrylic acid. A total concentration of aromatic hydrocarbons each having 8 to 10 carbon atoms in a (meth)acrylic acid composition ... 11/02/06 - 20060247469 - Process for rectificatively separating a liquid comprising acrylic acid and/or methacrylic acid A process for rectificatively separating a liquid which comprises acrylic acid, methacrylic acid or a mixture thereof, and additionally comprises low molecular weight aldehydes and acetone. ... 09/21/06 - 20060211886 - Method for collecting (meth)acrolein or (meth)acrylic acid and collecting device for the same (Meth)acrolein or (meth)acrylic acid is collected by bringing a reaction gas (1) containing (meth)acrolein or (meth)acrylic acid obtained through a vapor-phase catalytic oxidation reaction into contact with an aqueous solution as a collecting solvent in a collecting tower main body (2). The reaction gas (1) is supplied to the collecting ... 09/14/06 - 20060205979 - Method of purifying (meth)acrylic acid A crude acrylic acid-containing liquid containing acrylic acid is distilled in a distillation column to obtain a condensate of acrylic acid having an acrylic acid purity of 90% or more, and an oxygen-containing gas (air) containing oxygen is supplied to the condensate of acrylic acid in a reflux tank for ... 09/07/06 - 20060199977 - Process for removing methacrolein from liquid phase comprising acrylic acid as a main constituent and target product, and methacrolein as a secondary component A process for removing methacrolein from liquid phase P comprising acrylic acid as a main constituent and target product, and methacrolein as a secondary component in which the removal is effected by crystallization, the acrylic acid accumulating in the crystals formed and the methacrolein in the remaining mother liquor. ... 09/07/06 - 20060199976 - Process for removing methacrylic acid from liquid phase comprising acrylic acid as a main constituent and target product, and methacrylic acid as a secondary component A process for removing methacrylic acid from liquid phase P comprising acrylic acid as a main constituent and target product, and methacrylic acid as a secondary component in which the removal is effected by crystallization, the acrylic acid accumulating in the crystals formed and the methacrylic acid in the remaining ... 06/29/06 - 20060142613 - Process for producing (meth)acrylic acid In a process for producing (meth)acrylic acid comprising contacting a reaction gas containing (meth)acrylic acid obtained by gas-phase catalytic oxidation with an absorbent solvent to prepare a (meth)acrylic acid solution; and introducing the (meth)acrylic acid solution into a distillation column to purify (meth)acrylic acid, after a dissolved oxygen concentration in ... 06/01/06 - 20060116532 - Purification of a monomer by extraction with a phase-separating agent and crystallisation The invention concerns a process for purification of an acidic monomer having a double bond, as well as a device for synthesis of an acidic monomer having a double bond, a process for producing an acidic monomer having a double bond, an acid monomer having a double bond and obtainable ... 04/27/06 - 20060089512 - Method for reducing mehq content in acrylic acid The invention relates to the reduction of the content of MEHQ (methoxyhydroquinone) of acrylic acid or its salts by means of continuous adsorption on activated carbon. In particular, MEHQ is removed from partly or fully neutralized acrylic acid. ... 02/02/06 - 20060025629 - Method for producing (meth) acrylic acid Disclosed is a method for producing (meth)acrylic acid comprising a process of recovering (meth)acrylic acid as aqueous (meth)acrylic acid solution from a (meth)acrylic acid-containing gas mixture produced by the catalytic gas phase oxidation of at least one reactant selected from the group consisting of propane, propylene, isobutylene and (meth)acrolein, wherein ... 01/12/06 - 20060009657 - Method for purifying (meth)acrylic acid A method for purifying a crude (meth)acrylic acid obtained by a vapor phase catalytic oxidation method, characterized in that the crude (meth)acrylic acid having most parts of water and acetic acid removed therefrom, is fed to and distilled in a first distillation column of a purification system comprising first to ... 11/03/05 - 20050245763 - Method for recovering acrylic acid Disclosed is a simplified method for recovering acrylic acid from a mixture containing acrylic acid, acrylic acid dimer and impurities with high boiling point, in a stable and efficient manner. The method comprises the steps of: introducing the mixture into an acrylic acid recovering device comprising an acrylic distillation unit ... 10/06/05 - 20050222459 - (meth)acrylic acid crystal and method for the production and purification of aqueous (meth)acrylic acid The present invention relates to processes for purifying a composition containing (meth)acrylic acid, at least one impurity and water, wherein the composition has a water content in the range of 0.55 to 90, based on the composition, to form a purified phase containing (meth)acrylic acid and at least one impurity, ... 09/01/05 - 20050192464 - Method for producing (meth) acrylic acid The present invention relates to a method for producing (meth)acrylic acid comprising a process of recovering (meth)acrylic acid as an aqueous (meth)acrylic acid from a (meth)acrylic acid-containing gas mixture produced by the catalytic gas phase oxidation of at least one reactant selected from the group consisting of propane, propylene, isobutylene ... 08/11/05 - 20050176998 - Method for purifying (meth)acrylic acid A method for purifying a crude (meth)acrylic acid obtained by a vapor phase catalytic oxidation method, characterized in that the crude (meth)acrylic acid having most parts of water and acetic acid removed therefrom, is fed to and distilled in a first distillation column of a purification system comprising first to ... 08/11/05 - 20050176997 - Method for purifying (meth)acrylic acid A method for purifying a crude (meth)acrylic acid obtained by a vapor phase catalytic oxidation method, characterized in that the crude (meth)acrylic acid having most parts of water and acetic acid removed therefrom, is fed to and distilled in a first distillation column of a purification system comprising first to ... 08/04/05 - 20050171382 - Process for purifying (meth)acrylic acid and process for producing (meth)acrylic esters There is provided a process for purifying (meth)acrylic acid by efficiently removing transition metal components from crude (meth)acrylic acid containing the transition metal components as impurities. When the crude (meth)acrylic acid containing the transition metal components as impurities is contacted with the cation exchange resin to remove the transition metal ... 06/30/05 - 20050143604 - Method for producing acrylic acid A process for the fractional condensation of a hot gas mixture which as well as acrylic acid contains at least one further condensable component in a column in the presence of at least one stabilizer comprises metering in at least a portion of the at least one stabilizer as a ... ### FreshPatents.com Support - Terms & Conditions |