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| Number | Title | Issue Date |
| 8158561 | Scale and corrosion inhibitors for high temperature and pressure conditions The present invention relates to a method for inhibiting scale and corrosion in aqueous systems, for example, under high temperature and pressure conditions such as temperatures up to 250° C. and/or pressures up to 10000 psi (i.e., about 68.9 MPa). The method invol... | 04/17/2012 |
| 8157969 | Method and apparatus for minimizing accumulation of polymer on process equipment, especially safety devices Accumulation of polymer on equipment, which is in contact with polymerizable material during normal process operation, is minimized by the method and apparatus of the present invention. The method involves positioning and affixing the equipment, such as a pressure r... | 04/17/2012 |
| 8080686 | Integrated process for preparing a carboxylic acid from an alkane The present invention relates to an integrated process for producing unsaturated carboxylic acids from the corresponding C2-C4 alkane. The process begins with performance of thermally integrated dehydrogenation reactions which convert a C2... | 12/20/2011 |
| 8076403 | Process for grinding minerals in aqueous dispersion using a dispersing agent comprising homopolymers and/or copolymers of (meth)acrylic acid The process of the present invention produces an aqueous dispersion of mineral materials, suitable for use in pigments and other coatings, by introducing a fully neutralized dispersing agent to an aqueous dispersion of coarse mineral materials, grinding the aqueous ... | 12/13/2011 |
| 8049036 | Multi-staged catalyst systems and process for converting alkanes to alkenes and to their corresponding oxygenated products Alkenes, unsaturated saturated carboxylic acids, saturated carboxylic acids and their higher analogues are prepared cumulatively from corresponding alkanes utilizing using a multi-staged catalyst system and a multi-stage process which comprises steam cracking of alk... | 11/01/2011 |
| 8044238 | Method for production of purified (meth)acrylic acid The present invention relates to reducing corrosion of distillation equipment during azeotropic distillation of (meth)acrylic acid in the presence of dissolved copper, by providing aqueous (meth)acrylic acid having not more than 0.1% by weight formaldehyde, based on... | 10/25/2011 |
| 8044237 | Method for production of aqueous (meth)acrylic acid The present invention relates to recovery of aqueous (meth)acrylic acid by condensation of a (meth)acrylic acid-containing stream to produce aqueous (meth)acylic acid having a higher concentration of (meth)acrylic acid and a lower concentration of formaldehyde, i.e.... | 10/25/2011 |
| 8042578 | System and method for making paints from prepaints A manufacturing system for making paints from prepaints, along with a method related thereto. ... | 10/25/2011 |
| 8002047 | Method and apparatus for deflagration pressure attenuation A method for attenuating deflagration pressure produced by combustion of combustible gas in a defined region of a process vessel. The method generally comprises selecting and placing attenuating material in the defined region of the process vessel, wherein the selec... | 08/23/2011 |
| 7795469 | Process for the selective (AMM) oxidation of lower molecular weight alkanes and alkenes An improved process for the production of unsaturated carboxylic acids and unsaturated nitriles from their corresponding C3 to C5 alkanes, or mixtures of C3 to C5 alkanes and alkenes, that involves oxidation in the presenc... | 09/14/2010 |
| 7763746 | Process for chemical reactions involving cyanohydrins The present invention provides a method for minimizing the decomposition of cyanohydrins in exothermic chemical reactions involving cyanohydrins. The method comprises providing a reaction medium and reactants to a tubular reactor having internal mixing means, mixing... | 07/27/2010 |
| 7754916 | Process for converting a hydroxycarboxylic acid, or salts thereof, to an unsaturated carboxylic acid and/or its esters A process for converting a salt of a hydroxycarboxylic acid to an unsaturated carboxylic acid, or esters thereof. The process involves converting an ammonium salt of a hydroxycarboxylic acid in aqueous solution to a corresponding hydroxycarboxylic acid and ammonium ... | 07/13/2010 |
| 7723541 | 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, acr... | 05/25/2010 |
| 7718568 | Hydrothermally synthesized Mo-V-M-Nb-X oxide catalysts for the selective oxidation of hydrocarbons Hydrothermally synthesized catalysts comprising a mixed metal oxide are utilized to produce unsaturated carboxylic acids by the vapor phase oxidation of an alkane, or a mixture of an alkane and an alkene, in the presence thereof; or to produce unsaturated nitrites b... | 05/18/2010 |
| 7582790 | Process for chemical reactions involving cyanohydrins The present invention provides a method for minimizing the decomposition of cyanohydrins in exothermic chemical reactions involving cyanohydrins. The method comprises providing a reaction medium and reactants to a tubular reactor having internal mixing means, mixing... | 09/01/2009 |
| 7576030 | Activated ignition promoters for metal catalyzed reactions The inventors have discovered catalyst ignition promoters comprising one or more activated metals. The catalyst ignition promoters are easily prepared from a number of metal sources, including spent catalysts, are activated quickly and provide effective catalyst ign... | 08/18/2009 |
| 7556055 | Prevention of unwanted material accumulations In one embodiment, the invention provides a rupture disk assembly having a rupture disk and a rupture disk holder. The rupture disk holder has a first annular member downstream of the rupture disk, a second annular member upstream of the rupture disk, and an optiona... | 07/07/2009 |
| 7553986 | Process for the selective (amm)oxidation of lower molecular weight alkanes and alkenes An improved process for the production of unsaturated carboxylic acids and unsaturated nitrites from their corresponding C3 to C5 alkanes, or mixtures of C3 to C5 alkanes and alkenes, that involves a multi-stage reaction s... | 06/30/2009 |
| 7538059 | Regeneration of mixed metal oxide catalysts A mixed metal oxide, which may be an orthorhombic phase material, is regenerated, selectively enriched or selectively poisoned as a catalyst to reduce catalyst aging for the production of unsaturated carboxylic acids, or unsaturated nitrites, from alkanes, or mixtur... | 05/26/2009 |
| 7531587 | Thermal stabilizer composition for halogen-containing vinyl polymers Stabilizer compositions are used to stabilize halogen-containing vinyl polymers from, for example, degradation and discoloration. The stabilizer compositions comprise a mercaptoester, a reverse mercaptoester, and a Lewis acid. ... | 05/12/2009 |
| 7442348 | Sulfur-bearing residue treatment system A sulfur-bearing residue treatment system is provided for the recovery of valuable organic components and the reduction of capital costs and operating costs. The treatment system involves the use of a stripping vessel in conjunction with a heating apparatus. All ele... | 10/28/2008 |
| 7414149 | Non-routine reactor shutdown method The non-routine (e.g., emergency) shutdown of a chemical reaction process is achieved by a method of safely operating a chemical reaction process which comprises the steps of detecting an undesirable condition capable of affecting the process, minimizing the reactio... | 08/19/2008 |
| 7396955 | Annealed and promoted catalyst A mixed metal oxide, which may be an orthorhombic phase material, is improved as a catalyst for the production of unsaturated carboxylic acids, or unsaturated nitrites, from alkanes, or mixtures of alkanes and alkenes, by: contacting with a liquid contact member sel... | 07/08/2008 |
| 7393976 | Process for manufacturing reduced water content (meth)acrylic acid A method is provided herein for purifying (meth)acrylic acid to provide a purified (meth)acrylic acid product having a low aldehyde concentration and not more than 0.2 wt % water. One embodiment of the method includes distilling (meth)acrylic acid in the presence of... | 07/01/2008 |
| 7361622 | Multi-staged catalyst systems and process for converting alkanes to alkenes and to their corresponding oxygenated products Alkenes, unsaturated saturated carboxylic acids, saturated carboxylic acids and their higher analogues are prepared cumulatively from corresponding alkanes utilizing using a multi-staged catalyst system and a multi-stage process which comprises steam cracking of alk... | 04/22/2008 |
| 7326668 | Single crystalline phase catalyst An orthorhombic phase mixed metal oxide is produced selectively in quantitative yield and used to produce. ... | 02/05/2008 |
| 7326323 | High capacity purification of thermally unstable compounds Separations processes and apparati capable of purifying thermally sensitive materials at high capacity. An apparatus having a rectification section and a stripping section with the stripping section having a stripping tray with 5 to 50% open area, a pressure drop fr... | 02/05/2008 |
| 7304014 | Modified catalysts and process Modified metal oxide catalysts are disclosed which have different chemical, physical and catalytic properties, when used for catalytic conversions of carbon based compounds, as compared to corresponding unmodified metal oxide catalysts. Methods for preparing the mod... | 12/04/2007 |
| 7253307 | Process for production of methacrylic acid Provided herein are improved methods for producing methacrylic acid and methacrylate esters using combined or “integrated” processing steps including integrated hydrolysis, integrated cracking systems, and combinations thereof. In one embodiment, other aspects o... | 08/07/2007 |
| 7253279 | Method for inhibiting polymerization of (METH) acrylic acid and its esters using an inhibitor and a process for making a compound useful as such an inhibitor This invention relates to a method for inhibiting polymerization of (meth)acrylic acid and its esters using a polymerization inhibitor which comprises at least one reduced halide-content azine dye-based compound. A process for producing reduced halide-content azine ... | 08/07/2007 |
| 7252138 | Flow through tube plug A method and apparatus for the repair of damaged tubes, such as heat exchanger tubes, comprising inserting a flow through plug into the damaged heat exchanger tube. The flow through plug is tapered and creates a press fit when inserted within the heat exchanger tube... | 08/07/2007 |
| 7220879 | Method for inhibiting polymerization of (meth)acrylic acid and its esters using an inhibitor and a process for making a compound useful as such an inhibitor This invention relates to a method for inhibiting polymerization of (meth)acrylic acid and its esters using a polymerization inhibitor which comprises at least one reduced halide-content azine dye-based compound. A process for producing reduced halide-content azine ... | 05/22/2007 |
| 7112622 | Organic based thermal stabilizers and heat stabilized polymer compositions The present invention encompasses a novel organic based composition which includes at least one organic based heat stabilizer component, and at least one stabilizer modifying component selected from the group of liquid calcium soap and 1,3,5-tris (2-hydroxyethyl) cy... | 09/26/2006 |
| 7026502 | Preparation of unsaturated carboxylic acids and unsaturated carboxylic acid esters from alkanes and/or alkenes Unsaturated carboxylic acids (and esters thereof) are prepared directly from alkanes (and alcohols) utilizing vapor phase oxidative esterification. ... | 04/11/2006 |
| 7025904 | Method for improving adhesion of water-based inks to halogen-containing resin articles Flexible and semi-rigid vinyl chloride resin compositions comprising a combination of a latent mercaptan and a zinc salt of oxidized polyethylene (a zinc ionomer) as a heat stabilizer are substantially free from the offensive odor typically associated with mercaptan... | 04/11/2006 |
| 7018951 | Annealed and promoted catalyst A mixed metal oxide, which may be an orthorhombic phase material, is improved as a catalyst for the production of unsaturated carboxylic acids, or unsaturated nitriles, from alkanes, or mixtures of alkanes and alkenes, by: contacting with a liquid contact member sel... | 03/28/2006 |
| 7015173 | High temperature mixing A catalyst comprising a mixed metal oxide is useful for the vapor phase oxidation of an alkane or a mixture of an alkane and an alkene to an unsaturated carboxylic acid and for the vapor phase ammoxidation of an alkane or a mixture of an alkane and an alkene to an u... | 03/21/2006 |
| 6989410 | Processes for preparing multimodal polymer particle compositions A multimodal polymer particle composition containing two or more populations of polymer particles having a total rubbery weight fraction of less than 90 weight percent is provided. Also disclosed is a process for preparing multimodal polymer particle compositions th... | 01/24/2006 |
| 6989460 | Methods for producing unsaturated carboxylic acids and unsaturated nitriles Unsaturated carboxylic acids are produced by the vapor phase catalytic oxidation of mixtures of alkenes and alkanes in the presence of a catalyst containing a mixed metal oxide. Similarly, unsaturated nitriles are produced by the vapor phase catalytic oxidation of a... | 01/24/2006 |
| 6984750 | PVD supported mixed metal oxide catalyst A supported catalyst comprising a mixed metal oxide is useful for the vapor phase oxidation of an alkane or a mixture of an alkane and an alkene to an unsaturated carboxylic acid and for the vapor phase ammoxidation of an alkane or a mixture of an alkane and an alke... | 01/10/2006 |
