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| Number | Title | Issue Date |
| 7485747 | Two stage oxidation process for the production of aromatic dicarboxylic acids Disclosed is a process for producing a benzenedicarrboxylic acid such as terephthalic acid wherein a dialkyl benzene compound and acetic acid having catalyst components dissolved therein are fed to a first reaction zone wherein the dialkyl benzene compound is oxidiz... | 02/03/2009 |
| 7410632 | Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid A method for removing impurities from a mother liquor comprising a carboxylic acid, a metal catalyst, impurities by (a) evaporating the mother liquor comprising a carboxylic acid, the metal catalyst, impurities, water and a solvent in a first evaporator zone to prod... | 08/12/2008 |
| 7381386 | Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid A method for removing impurities from a mother liquor comprising a carboxylic acid, a metal catalyst, impurities by (a) evaporating the mother liquor comprising a carboxylic acid, a metal catalyst, impurities and a solvent in a first evaporator zone to produce a vap... | 06/03/2008 |
| 7371894 | Optimized liquid-phase oxidation Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reacti... | 05/13/2008 |
| 7358392 | Process for the oxidative purification of terephthalic acid Disclosed is a process to produce a purified carboxylic acid slurry. The process comprises removing impurities from a crystallized product in a solid liquid displacement zone to form the purified carboxylic acid slurry. The process produces purified carboxylic acid ... | 04/15/2008 |
| 7351396 | Extraction process for removal of impurities from an aqueous mixture A method for removing impurities from an aqueous mixture or purified aqueous by extracting the aqueous mixture or purified aqueous mixture with an extraction solvent in an extraction zone to form an extract stream and the raffinate stream; and optionally separating ... | 04/01/2008 |
| 7339072 | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production In this invention, a process is provided by which a carboxylic acid/diol mixture suitable as starting material for a polyester production is obtained from a decolorized carboxylic acid solution without isolation of a substantially dry carboxylic acid solid. More spe... | 03/04/2008 |
| 7291270 | Process for removal of impurities from an oxidizer purge stream A process is disclosed that relates to the removal of impurities and the recovery of a mother liquor and wash filtrate from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves the rem... | 11/06/2007 |
| 7282151 | Process for removal of impurities from mother liquor in the synthesis of carboxylic acid using pressure filtration A process is disclosed that relates to the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves recovery of a metal catalyst from an oxidizer purge st... | 10/16/2007 |
| 7276625 | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production In this invention, a process is provided by which a carboxylic acid/diol mixture suitable as starting material for a polyester production is obtained from a decolorized carboxylic acid solution without isolation of a substantially dry carboxylic acid solid. More spe... | 10/02/2007 |
| 7273559 | Process for removal of impurities from an oxidizer purge stream A process is disclosed that relates to the removal of impurities and the recovery of a mother liquor and wash filtrate from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves the rem... | 09/25/2007 |
| 7214760 | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production The present invention relates to a process by which a carboxylic acid/diol mixture is obtained from a slurry or cake carboxylic acid product without isolation of a substantially dry carboxylic acid solid. More specifically, the present invention relates to a process... | 05/08/2007 |
| 7196215 | Process for the production of purified terephthalic acid Disclosed is a process for the production of terephthalic acid by a plurality of process steps including the catalyst oxidation of a dialkylbenzene compound, a second oxidation, a hydrogenation of the product of the second oxidation, and crystallization of the hydro... | 03/27/2007 |
| 7164038 | Process for decolorizing aromatic dicarboxylic acids In a process for reducing the visible color of a crude aromatic dicarboxylic acid containing colored contaminants, an aqueous ammonia solution of the crude aromatic dicarboxylic acid is prepared and contacted with hydrogen in a reactor in the presence of a heterogen... | 01/16/2007 |
| 7161027 | Process for the oxidative purification of terephthalic acid Disclosed is a process to produce a purified carboxylic acid slurry. The process comprises removing impurities from a crystallized product in a solid liquid displacement zone to form the purified carboxylic acid slurry. The purified carboxylic acid slurry is further... | 01/09/2007 |
| 7135596 | Method of removing iron contaminants from liquid streams during the manufacture and/or purification of aromatic acids This invention relates to control or removal of amounts of dissolved iron that may be present in liquid process streams in the manufacture of aromatic acids. The present invention further relates to the control or removal of dissolved iron contaminants present in li... | 11/14/2006 |
| 7098299 | Separation of contaminants from polyester materials The present invention is generally directed to a process for separating and recovering post-consumer polyester from various contaminant materials. The invention can be utilized to separate post-consumer polyester from various contaminants including glass, dirt, pape... | 08/29/2006 |
| 7074954 | Process for the oxidative purification of terephthalic acid Disclosed is a process to produce a purified carboxylic acid slurry. The process comprises removing impurities from a crystallized product in a solid liquid displacement zone to form the purified carboxylic acid slurry. The process produces purified carboxylic acid ... | 07/11/2006 |
| 7041847 | Method for cleaning crude terephthalic acid and catalysts suitable for the same and containing carbon fibers The invention relates to a method for cleaning crude terephthalic acid by means of catalytic, hydrogenating aftertreatment using a catalyst material containing at least one hydrogenation metal applied to a carbon carrier consisting of carbon fibres. The invention al... | 05/09/2006 |
| 7005540 | Method of purifying aromatic polycarboxylic acid Crude polycarboxylic acid is slurried in an aqueous medium and the slurry is brought into contact with a metal catalyst while preventing catalyst components thereof from contaminating crystals. Since hydrogenation or decarbonylation of a polymerization inhibitory su... | 02/28/2006 |
| 6992037 | Precious metal catalyst for debenzylation One aspect of the invention relates to catalyst composite containing a metal catalyst and a specifically defined carbon support containing a carbonaceous material. For example, the carbon support may have a total pore surface area of about 800 m2/g or mor... | 01/31/2006 |
| 6855845 | Process for the preparing bromoisophithalic acid compound The present invention relates to a process for preparing bromoisophthalic acid compounds, particularly 5-bromoisophthalic acid compounds and 4,5-dibromoisophthalic acid compounds comprising brominating an isophthalic acid compound of the general formula (1) | 02/15/2005 |
| 6765113 | Production of aromatic carboxylic acids A process for the production of an aromatic carboxylic acid comprising contacting in the presence of a catalyst, within a continuous flow reactor, one or more precursors of the aromatic carboxylic acid with an oxidant, such contact being effected with said precursor... | 07/20/2004 |
| 6756509 | Method for purifying crude 2,6-naphthalenedicarboxylic acid A method for purifying crude 2,6-naphthalenedicarboxylic acid includes a reduction step of reducing crude 2,6-naphthalenedicarboxylic acid containing 6-formyl-2-naphthoic acid with hydrogen and a cleaning step of cleaning the reduction product with alcohol. Preferab... | 06/29/2004 |
| 6753290 | Catalytic composition, method for manufacturing thereof and method for the purification of terephthalic acid The present invention relates to catalyst compositions for purifying terephthalic acid from p-carboxybenzaldehyde, based on Group VIII metals, comprising crystallites of catalytically active palladium or of palladium and at least one metal of Group VIII of the Perio... | 06/22/2004 |
| 6747171 | Low temperature purification of naphthalene dicarboxylic acids A process for purifying a naphthalenic carboxylic acid comprising contacting at a temperature below about 575° F. a mixture comprising an impure naphthalenic carboxylic acid and a solvent in the presence of hydrogen gas with a noble metal on carbon catalyst. The pr... | 06/08/2004 |
| 6723873 | Production of terephthalic acid and ethylene glycol from polyethlene terephthalate by ammoniolysis A process for forming reactants useful in the manufacture of polyethylene terephthalate includes the steps of: (a) contacting recyclable polyethylene terephthalate with ammonium hydroxide whereby a mixture of ammonium terephthalate and ethylene glycol is formed, (b)... | 04/20/2004 |
| 6720448 | Method of recovering chemical species by depolymerization of poly (ethylene terephthalate) and related use The present invention relates to a method of recovering a solution comprising the chemical species obtained by depolymerization of PET from a material containing poly(ethylene terephthalate) in the form of bottles, by making said material react, in the absence of wa... | 04/13/2004 |
| 6717009 | Method for making high-purity naphthalenedicarboxylic acid A high-purity naphthalenedicarboxylic acid is produced by a method including Steps [1] and [2]: In Step [I], a raw mixture of crude terephthalic acid and crude naphthalenedicarboxylic acid is dissolved into high-temperature high-pressure water to form a dibasic acid... | 04/06/2004 |
| 6670503 | Method for recovery of terephthalic acid from a material containing poly(ethylene terephthalates) The present invention relates to a method of recovering terephthalic acid from a material containing poly(ethylene terephthalate) (P.E.T.) in the form of bottles, by making said material react, in the absence of water, with a reagent consisting of one or ... | 12/30/2003 |
| 6562998 | Granules of 2-hydroxynaphthalene-3-carboxylic acid and method for preparing the same Granular product of 2-hydroxynaphthalene-3-carboxylic acid with well-suppressed dusting tendency, and process for preparing the same is provided. Granular product of 2-hydroxynaphthalene-3-carboxylic acid having an average particle size of 150 μm or more... | 05/13/2003 |
| 6461700 | Aromatic acid monomers, polymers, products and processes for their manufacture Processes for producing aromatic monomers useful for forming polyesters are disclosed. Cost effective steps employed in the processes permit small amounts of process-related materials typically removed from monomer to remain in an aromatic monomer product... | 10/08/2002 |
| 6458980 | Chelating agents and their manganic chelates Chelating agents (chelants) of the general structure: ##STR1## wherein: n=2-4 ##STR2## X=--CR1 R2 --, or whereby at least two of X are of formula III Y=COOH, --PO3 H2 or o-hydroxyphenyl R1, R2 a... | 10/01/2002 |
| 6310239 | Process for manufacturing terephthalic acid This invention relates to a process for manufacturing terephthalic acid and more particularly, to a process for manufacturing and recovering the highly purified terephthalic acid, in accordance with the practice of this invention comprising the following ... | 10/30/2001 |
| 6284920 | Aromatic acid monomers, polymers, products and processes for their manufacture Processes for producing aromatic monomers useful for forming polyesters are disclosed. Cost effective steps employed in the processes permit small amounts of process-related materials typically removed from monomer to remain in an aromatic monomer product... | 09/04/2001 |
| 6265608 | Method of purifying aromatic dicarboxylic acids An aromatic dicarboxylic acid is purified by oxidizing m-xylene or p-xylene to produce crude isophthalic acid or crude terephthalic acid, respectively. The products of the oxidizing step are hydrogenated in the presence of a palladium catalyst. Carbon mon... | 07/24/2001 |
| 6255525 | Process for preparing purified carboxylic acids A process for preparing an aromatic carboxylic acid having improved purity comprising contacting at an elevated temperature and pressure a mixture comprising an impure aromatic carboxylic acid and a solvent in the presence of hydrogen gas with a carbon ca... | 07/03/2001 |
| 6245939 | Process for producing highly pure aromatic carboxylic acids An improved process for producing highly pure aromatic carboxylic acid from an impure solid acid product whereby the solid acid product is efficiently dissolved in a suitable solvent at relatively low temperatures despite the presence of solid lumps.... | 06/12/2001 |
| 6239310 | Method of recovery of terephthalic acid and ethylene glycol from poly/ethylene terephthalate/wastes A subject of the invention is the method of recovery of terephthalic acid and ethylene glycol from poly/ethylene terephthalate/wastes. According to the invention poly/ethylene terephthalate/ is heated in an aqueous solution at the temperature from 150° C... | 05/29/2001 |
| 6054610 | Method and apparatus for preparing purified terephthalic acid and isophthalic acid from mixed xylenes A method and apparatus for preparing purified terephthalic acid and, optionally, isophthalic acid from mixed xylenes. The method of the present invention purifies the oxidation reactor effluent containing a mixture of terephthalic acid and isophthalic aci... | 04/25/2000 |
