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| Number | Title | Issue Date |
| 8168824 | Purification of acetic acid from wood acetylation process using extraction There is shown a method of purifying glacial acetic acid containing terpene and terpenoid impurities. Substantially dry acetic acid containing terpene and terpenoid impurities is combined with water and a suitable organic solvent, which is substantially immiscible w... | 05/01/2012 |
| 8076512 | Preparation of acetic acid A method for reducing aldehydes in an acetic acid production process is disclosed. The acetic acid is produced by reacting methanol and carbon monoxide in the presence of a carbonylation catalyst. The method comprises reacting an aldehyde-containing stream with an a... | 12/13/2011 |
| 7985878 | Method for removing iodide compound from organic acid An iodide compound is adsorbed and removed from an organic acid containing the iodide compound as an impurity by passing the organic acid through a packed bed of a cation-exchange resin having silver ion carried thereon at 50° C. or lower. The cation-exchange resin... | 07/26/2011 |
| 7910773 | Adsorption of volatile organic compounds derived from organic matter A method for adsorbing volatile organic compounds (VOCs) derived from organic matter comprises adsorbing the VOCs onto palladium doped ZSM-5, optionally at ambient temperature. The organic matter can be perishable organic goods such as food, including fruit and/or v... | 03/22/2011 |
| 7884241 | Distillation process A mixture containing hydrogen iodide and water and having a water content of not more than 5% by weight (particularly not more than 3% by weight) in a distillation system is distilled to prevent condensation of hydrogen iodide in the distillation system. The mixture... | 02/08/2011 |
| 7855306 | Process for the production of acetic acid A process for the reduction and/or removal of permanganate reducing compounds formed by the carbonylation of methanol in the presence of a Group VIII metal carbonylation catalyst to produce acetic acid is disclosed. More specifically, a process for reducing and/or r... | 12/21/2010 |
| 7790922 | Purification of acetic acid from wood acetylation process using extraction There is shown a method of purifying glacial acetic acid containing terpene and terpenoid impurities. Substantially dry acetic acid containing terpene and terpenoid impurities is combined with water and a suitable organic solvent, which is substantially immiscible w... | 09/07/2010 |
| 7678940 | Process for producing carboxylic acid A process for producing a purified carboxylic acid having “n+1” carbon atoms comprises feeding a carboxylic acid stream containing a carboxylic acid having “n+1” carbon atoms, a hydrogen halide, a lower boiling point (bp) component, a higher bp component, an... | 03/16/2010 |
| 7612232 | Purification of acetic acid from wood acetylation process A method of purifying acetic acid containing terpene and terpenoid impurities, includes: (a) supplying acetic acid containing terpene or terpenoid impurities and water to a distillation column; (b) azeotropically removing terpene or terpenoid impurities from the mix... | 11/03/2009 |
| 7538245 | Process for the manufacture of an enantiopure compound Process for the manufacture of an enantiopure compound comprising at least one functional group capable of reacting with an activated carboxyl group, starting from a mixture of enantiomers of the said compound, in which process: (a) a reaction medium comprising the ... | 05/26/2009 |
| 7524988 | Preparation of acetic acid A method for removing aldehyde impurities from an acetic acid stream is disclosed. The method comprises reacting an acetic acid stream containing aldehyde impurities with a hydroxyl compound to form corresponding acetals. The acetals are subsequently removed from th... | 04/28/2009 |
| 7485749 | Preparation of acetic acid A method for removing aldehyde impurities from an acetic acid stream is disclosed. The method comprises reacting aldehyde impurities with a hydroxyl compound in a drying distillation column or a combined column to form corresponding acetals. The acetals are subseque... | 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 |
| 7368603 | Method for purifying compounds containing functional groups The present invention relates to a method for producing a saturated organic compound bearing at least one functional group from a mixture which comprises this saturated organic compound containing at least one functional group and also one or more other organic comp... | 05/06/2008 |
| 7365219 | Solid phase extraction method for obtaining high-purity unsaturated compounds or derivatives of said compounds The invention relates to a novel extraction method for obtaining at least one unsaturated, optionally derivatized compound, from mixtures of said compounds with other less saturated constituents, e.g. for obtaining polyunsaturated fatty acids or the derivatives ther... | 04/29/2008 |
| 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 |
| 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 |
| 7291273 | Methods for removing metals from plating operation The present invention relates to compounds and methods for removing metals, e.g., ionic cobalt from an electroless plating operation, preferably to levels less than 5 ppm. The metals can then be either landfilled or regenerated for electrowinning and reuse. The inve... | 11/06/2007 |
| 7271293 | Control method for process of removing permanganate reducing compounds from methanol carbonylation process Disclosed is a method of controlling a separation process for removing permanganate reducing compounds from a process stream in the methanol carbonylation process for making acetic acid, where the method includes the steps of measuring the density of a stream contai... | 09/18/2007 |
| 7223883 | Removal of permanganate reducing compounds from methanol carbonylation process stream An improvement of the methanol carbonylation process for manufacturing acetic acid is disclosed. Specifically disclosed is a method for removing permanganate reducing compounds (“PRC's”) from the condensed light ends overhead stream, including (a) distilling at ... | 05/29/2007 |
| 7223886 | Removal of permanganate reducing compounds from methanol carbonylation process stream An improvement of the methanol carbonylation process for manufacturing acetic acid is disclosed. Specifically disclosed is a method for reducing the formation of alkyl iodides and C3-8 carboxylic acids by removing permanganate reducing compounds (“PRC's... | 05/29/2007 |
| 7208624 | Process for producing acetic acid An improved process is disclosed for producing acetic acid, including the following steps: reacting a carbonylatable reactant such as methanol, methyl acetate, methyl formate or dimethyl ether with carbon monoxide in a reaction medium containing water, methyl iodide... | 04/24/2007 |
| 7208625 | Removing permanganate-reducing impurities from acetic acid A method for removing permanganate-reducing impurities from an acetic acid product is disclosed. The method comprises contacting an acetic acid product containing permanganate-reducing impurities with peracetic acid and an oxygen-containing gas. The method is partic... | 04/24/2007 |
| 7196218 | Microbial process for the preparation of acetic acid, as well as solvent for its extraction from the fermentation broth A modified water-immiscible solvent useful in the extraction of acetic acid from aqueous streams is a substantially pure mixture of isomers of highly branched di-alkyl amines. Solvent mixtures formed of such a modified solvent with a desired co-solvent, preferably a... | 03/27/2007 |
| 7186344 | Membrane based fluid treatment systems A process for removing soluble and insoluble inorganic, organic, and microbiological contaminants from a fluid stream employing a pretreatment module, a post-treatment module, a recycle stream module or any combination thereof, and a membrane module, is provided. Th... | 03/06/2007 |
| 7048835 | System and method for acetic acid recovery during terephthalic acid production A distillation system and method for recovering acetic acid from a feed stream containing acetic acid and water stream generated during terephthalic acid production. The invention includes a dehydration column utilizing azeotropic distillation to recover the acetic ... | 05/23/2006 |
| 7041199 | Process and device for hydrolytically obtaining a carboxylic acid alcohol from the corresponding carboxylate A process and a device for the catalytic hydrolysis of a carboxylate, e.g., methyl acetate, ethyl acetate, i- or n-propyl acetate, i- or n-butyl acetate, allyl acetate and methyl formate, into the corresponding carboxylic acid and alcohol, by a combination of a pre-... | 05/09/2006 |
| 6955743 | Method for producing furfural, acetic acid and formic acid from spent pulp-cooking liquor The invention relates to a process for recovering and producing chemicals in a pulp production process where organic chemicals, such as formic acid and acetic acid, are used as cooking chemicals. The process of the invention is based on regeneration of cooking acids... | 10/18/2005 |
| 6942803 | Process for purifying an organic acid A process is disclosed for purifying an aqueous feed stream comprising a product organic acid, such as lactic acid, and a strong contaminant, such as pyruvic acid or oxalic acid. The molar concentration of the product organic acid in the feed stream typically is at ... | 09/13/2005 |
| 6926810 | Process for obtaining an organic acid from an organic acid ammonium salt, an organic acid amide, or an alkylamine organic acid complex Disclosed herein are methods for the recovery of an organic acid, such as a heat stable lactic acid, from a feed stream which contains at least one of an organic acid amide, an organic acid ammonium salt, or an alkylamine-organic acid complex. The feed stream is mix... | 08/09/2005 |
| 6867329 | Waste water treatment in a method for producing formic acid which is free of water The invention relates to a process for obtaining anhydrous or substantially anhydrous formic acid, in which firstly aqueous formic acid is prepared by hydrolysis of methyl formate and is freed from water in the subsequent work-up. The process has the special feature... | 03/15/2005 |
| 6838579 | Utilization of an extracting agent as antifoaming agent in the production of anhydrous formic acid The invention relates to a process for obtaining anhydrous or substantially anhydrous formic acid in which, during the work-up, a compound of the general formula I where the radicals R1 and R2 are alkyl, cycloalkyl, ar... | 01/04/2005 |
| 6793777 | Method for separating and purifying an aqueous mixture that mainly consists of acetic acid and formic acid The invention relates to a method for separating and purifying an aqueous mixture that mainly consists of acetic acid, formic acid and high-boiling substances by extraction with a solvent in a cyclic process. The inventive method is characterized in that the flow of... | 09/21/2004 |
| 6747067 | Process for converting cellulosic material into liquids A process for the production of oxygenated C2 hydrocarbons from cellulose is disclosed. The input cellulose waste is gasified using steam in the absence of air and the primary gaseous products of carbon monoxide and hydrogen are subjected to heat, pressur... | 06/08/2004 |
| 6706193 | Method for recovering fluorinated emulsifiers from aqueous phases Fluorinated emulsifiers can be recovered from an aqueous phase containing small amounts of fluoropolymer particles by treating the aqueous phase with a small amount of a nonionic surface-active agent, bringing the aqueous phase adjusted in this way into contact with... | 03/16/2004 |
| 6695952 | Method for the separation of and purification of an aqueous mixture consisting of the main components acetic acid and formic acid A method for the separation and purification of an aqueous mixture of main components, namely acetic acid and formic acid and non-volatiles by extraction, uses a solvent in a circulatory system. A raffinate stream is mixed with the larger proportion of wa... | 02/24/2004 |
| 6667418 | Oxidation treatment of a recycle stream in production of acetic acid by methanol carbonylation A method and system is provided for producing acetic acid by the catalytic carbonylation of methanol with carbon monoxide to obtain a reaction product stream comprising acetic acid and a minor amount of acetaldehyde. The acetaldehyde content in the reacti... | 12/23/2003 |
| 6657078 | Low energy carbonylation process A low energy process for producing acetic acid by the carbonylation of methanol is disclosed. The process involves a rhodium-catalyzed system operated at less than about 14% water utilizing up to 2 distillation columns. The process is preferably controlle... | 12/02/2003 |
| 6641734 | Process for purifying an organic acid A process is disclosed for purifying an aqueous feed stream comprising a product organic acid, such as lactic acid, and a strong contaminant, such as pyruvic acid or oxalic acid. The molar concentration of the product organic acid in the feed stream typic... | 11/04/2003 |
| 6627768 | Process for recovery of acid The invention provides a process for the conversion of an extracted carboxylic acid to a non-ionized derivative thereof, comprising contacting a carboxylic acid containing aqueous solution with a water-insoluble amine solvent, to recover acid therefrom an... | 09/30/2003 |
