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| Number | Title | Issue Date |
| 7964756 | Process for absorbing methylacrolein with ionic liquid Disclosed is a process for absorbing methylacrolein, characterized in that it absorbs methylacrolein by an absorbent comprising an ionic liquid. The absorbent can absorb methylacrolein effectively, and it is easy to be separated from methylacrolein, regenerated and ... | 06/21/2011 |
| 7385090 | Method of treating an aldehyde mixture, use of the treated aldehyde, and an alcohol A method of treating an aldehyde mixture comprising a carboxylic acid and a metal cation, which method comprises: contacting the aldehyde mixture with a basic separating medium, and subsequently or simultaneously contacting with an acidic separating medium; use of t... | 06/10/2008 |
| 7351339 | Method for the separation of acids from chemical reaction mixtures by means of ionic fluids A process for removing acids from reaction mixtures using an auxiliary base, in which the auxiliary base: combines with the acid to form a salt which is liquid at temperatures at which the product of value does not significantly decompose during the removal of the l... | 04/01/2008 |
| 7345197 | Preparation of acetic acid A method for removing aldehyde impurities from acetic acid is disclosed. The method comprises extracting the aldehyde impurities from a methyl iodide solution such as the decanter heavy phase with a polyol. After the aldehyde impurities are removed, the methyl iodid... | 03/18/2008 |
| 7342139 | Method for producing highly concentrated formaldehyde solution A process for preparing a high-concentration formaldehyde solution by removing water from a lower-concentration formaldehyde solution having a formaldehyde content of from 5 to 50% by weight, in which the lower-concentration formaldehyde solution is fed to a preheat... | 03/11/2008 |
| 7338579 | Dewatering process A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water, and methanol by distilling in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product contains substantially... | 03/04/2008 |
| 7332092 | Method of separating E and Z isomers of an alkene alcohol and derivatives thereof E and Z isomers of alkene alcohols and/or alkene alcohol derivatives are separated by substantially continuously contacting an ion exchange medium which is ion exchanged with silver and/or copper ions with the feed stream comprising the E and Z isomers of at least o... | 02/19/2008 |
| 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 |
| 7189579 | Zero headspace extractor and method for determining partitioning and contaminant release rates of volatile and semi-volatile compounds A method and device for measuring release rates of contaminants in at least one of a fast release mode and a slow release mode in which a volatile liquid sample is introduced into a sealed transparent reactor vessel having at least one sorbent contained within the t... | 03/13/2007 |
| 7176335 | Method for producing methacrolein from isobutane A process prepares methacrolein from isobutane by subjecting isobutane to a partial catalytic dehydrogenation in the gas phase and using the isobutenic product gas mixture to charge an oxidation zone in which the isobutene is oxidized to methacrolein in the gas phas... | 02/13/2007 |
| 7145043 | Non-Hazardous oxidative neutralization of aldehydes Methods, compositions, and devices for alleviating the problems of toxic discharge of aldehydes present in waste streams are disclosed. The methods relate to forming neutralized aldehydes by treating aldehydes with oxidizing agents. The oxidizing agents offer a simp... | 12/05/2006 |
| 7126030 | Stabilized hydroxypivalaldehyde In the method of the invention, hydroxypivalaldehyde (3-hydroxy-2,2-dimethylpropanal) and/or its dimer is stored under solid conditions containing an amount of water. By storing such solid conditions, hydroxypivalaldehyde and/or its dimer is stored for a long period... | 10/24/2006 |
| 7045554 | Method for improved Fischer-Tropsch catalyst stability and higher stable syngas conversion The present invention is generally related towards methods for preparing and using a more stable synthesis catalysts. In particular, the present invention is directed towards treating synthesis catalysts with low levels of oxygen to deactivate the smaller more unsta... | 05/16/2006 |
| 7012163 | Non-hazardous oxidative neutralization of aldehydes Methods, compositions, and devices for alleviating the problems of toxic discharge of aldehydes present in waste streams are disclosed. The methods relate to forming neutralized aldehydes by treating aldehydes with oxidizing agents. The oxidizing agents offer a simp... | 03/14/2006 |
| 6992112 | Selective removal of oxygen from syngas The present invention is an improvement in the preparation of liquid hydrocarbons from natural gas/methane, oxygen and/or steam. In particular, the present invention relates to processes for the production of synthesis gas, reducing the oxygen concentration from the... | 01/31/2006 |
| 6936177 | Method for removing metal from wastewater An object of the present invention is to provide a method for efficiently removing a metal from wastewater formed by subjecting the liquid waste to wet combustion treatment or wet oxidation treatment, said liquid waste resulting from an acrylic acid production proce... | 08/30/2005 |
| 6822123 | Formaldehyde process A process is provided for the production of formaldehyde from methyl chloride. In the process methyl chloride is oxidized with air over a catalyst to give formaldehyde and hydrogen chloride. In a preferred embodiment of the invention, a mixture of two different cata... | 11/23/2004 |
| 6809224 | Method for the separation of formaldehyde from a reaction mixture containing polyols by the addition of solvents before and/or during the distillation Formaldehyde is removed by distillation from reaction solutions containing a methlolated alkanal which was obtained from the reaction of formaldehyde with an alkanal which has at least one acidic hydrogen atom α to the carbonyl function or from the reaction of a 2-... | 10/26/2004 |
| 6727391 | Method for processing a liquid hydroformylation discharge A liquid output from a continuous hydroformylation, which comprises essentially aldehydes, high-boiling by-products, a homogeneously dissolved hydroformylation catalyst, unreacted olefins, low-boiling by-products and dissolved synthesis gas, is worked up by a proces... | 04/27/2004 |
| 6515187 | Process for recovering acrolein or propionaldehyde from dilute aqueous streams A method of purifying acrolein or propionaldehyde with a single column distillation system is provided, where the distillation system has a side-draw take-off outlet for recovering purified acrolein or propionaldehyde located between the crude product fee... | 02/04/2003 |
| 6511583 | Method for separating a liquid crude aldehyde mixture by distillation In a process for the fractional distillation of a liquid crude aldehyde mixture including straight-chain and branched aldehydes, the product mixture is fractionated in a first distillation column to give a product stream of branched aldehyde, a product st... | 01/28/2003 |
| 6486307 | Preparation of glucosamine hydrochloride A method of producing glucosamine hydrochloride from chitin by grinding the chitin to a very fine size and digestion with concentrated hydrochloric acid. The glucosamine hydrochloride is decolorized with activated charcoal, washed with ethanol and assayed... | 11/26/2002 |
| 6478929 | Dewatering process A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water and methanol by distilling the solution in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product... | 11/12/2002 |
| 6353140 | Process for the purification of cyclopropanecarboxaldehyde Disclosed is process for the treatment of cyclopropanecarboxaldehdye (CPCA) which contains crotonaldehyde impurity with a base at elevated temperature to convert the crotonaldehyde to one or more higher boiling compounds followed by distillation to recove... | 03/05/2002 |
| 6252123 | Membrane separation process for metal complex catalysts This invention relates to a process for the separation of a metal complex catalyst and any free ligand which may be present, from a homogeneous organic synthesis reaction mixture using sub-nanoporous, chemically stable membranes having discrete pores whic... | 06/26/2001 |
| 6198006 | Process for the manufacture of citral A process for the manufacture of citral is provided by the catalyzed rearrangement of dehydrolinalool to citral. The rearrangement is carried out in the presence of a molybdenum compound of the general formula MoO2 X2 wherein X signi... | 03/06/2001 |
| 6193837 | Preparation of brightness stabilization agent for lignin containing pulp from biomass pyrolysis oils A process for producing a brightness stabilization mixture of water-soluble organic compounds from biomass pyrolysis oils comprising: a) size-reducing biomass material and pyrolyzing the size-reduced biomass material in a fluidized bed reactor; b) separating a... | 02/27/2001 |
| 6191313 | Process for the manufacture of dihydrocitral A process for the manufacture of dihydrocitral, a valuable intermediate, through the catalyzed rearrangement of dihydrodehydrolinalool by carrying out the rearrangement in the presence of a molybdenum compound of the general formula MoO2 X... | 02/20/2001 |
| 6137013 | Method of stabilizing aldehydes A method of stabilizing aliphatic C3 -C14 -aldehydes against polymerization and autocondensation by the addition of alkaline substances to the aldehydes wherein the alkaline substances used are alkali metal hydroxides, alkaline earth... | 10/24/2000 |
| 6051736 | Preparation of (meth)acrylic acid The invention is directed toward preparation of (meth)acrylic acid, comprising condensation of a gas comprising (meth)acrylic acid, absorption with water, and extraction with an aqueous solution forming a miscibility gap.... | 04/18/2000 |
| 6039846 | Separation of 3-methyl-2-pentenal from n-butanol by azeotropic distillation 3-Methyl-2-pentenal cannot be separated from 1-butanol by conventional rectification because of the proximity of their boiling points. 3-methyl-2-pentenal can be readily separated from n-butanol by azeotropic distillation. Effective agents are dimethoxyme... | 03/21/2000 |
| 6017423 | Separation of 3-methyl-2-pentenal from N-butanol by extractive distillation 3-Methyl-2-pentenal cannot be separated from n-butanol by conventioal rectification because of the proximity of their boiling points. 3-methyl-2-pentenal can be readily separated from n-butanol by extractive distillation. Effective agents are 1-methyl-2-p... | 01/25/2000 |
| 5865957 | Method for producing butyraldehydes A method for producing butyraldehydes, by separating and purifying mixed butyraldehyde products formed by hydroformylation of propylene, into n-butyraldehyde and isobutyraldehyde by using a distillation column, wherein the distillation column is operated ... | 02/02/1999 |
| 5760283 | Acrolein scavengers A process for removing acrolein from a gaseous or liquid mixture, in one case aqueous solutions, involving contacting the mixture with a compound selected from the group consisting of sodium hypochlorite; an acid salt of hydroxylamine; a urea compound suc... | 06/02/1998 |
| 5756803 | Process for the condensation of an aldehyde with hydrogen cyanide A process for the condensation of an aldehyde with hydrogen cyanide in the presence of a buffer is disclosed. The buffer advantageously allows the condensation reaction to occur at a pH equal to or above 4.0 and in the absence of amines.... | 05/26/1998 |
| 5756855 | Stabilization of phosphite ligands in hydroformylation process The present invention provides a hydroformylation process comprising: (1) forming a reaction mixture containing: (a) an olefinic compound, (b) hydrogen, (c) carbon monoxide, (d) a phosphite in which each phosphorus atom is bonded to three oxygen atoms and... | 05/26/1998 |
| 5693194 | Separation of butyraldehyde from ethanol by extractive distillation Butyraldehyde cannot be separated from ethanol by conventional distillation or rectification because they form a minimum boiling azeotrope. Butyraldehyde can be readily separated from ethanol by extractive distillation. Effective agents are 2-propanol, m-... | 12/02/1997 |
| 5606094 | Acrolein scavengers Disclosed herein is a process for removing acrolein from a gaseous or liquid mixture, in one case aqueous solutions, involving contacting the mixture with a compound selected from the group consisting of sodium hypochlorite; an acid salt of hydroxylamine;... | 02/25/1997 |
| 5580427 | Separation of butyraldehyde from ethanol by azeotropic distillation Butyraldehyde cannot be separated from ethanol by conventional distillation or rectification because they form a minimum boiling azeotrope. Butyraldehyde can be readily separated from ethanol by azeotropic distillation. Effective agents are ethyl formate,... | 12/03/1996 |
