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Class 568/438 - Purification or recovery


Subclass of Class 568 - Organic compounds -- part of the class 532-570 series
Definition: Processes which include separating the compound from impurities
No. of patents: 65
Last issue date: 03/22/2011


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NumberTitleIssue Date
7910780Method for purifying terephthalaldehyde
The present invention relates to a method for purifying terephthalaldehyde which comprises a first step of dissolving terephthalaldehyde containing impurities in an aromatic solvent at high temperature to prepare a solution; and a second step of quenching the soluti...
03/22/2011
7402708Method for producing aqueous ortho-phthalaldehyde solutions
A method for producing aqueous ortho-phthalaldehyde solutions which comprises introducing an acetal of the o-phthalaldehyde into water and subsequently setting a pH
07/22/2008
7399889Process for the preparation of vanillin from agricultural waste
The present invention provides a process for the preparation of Vanillin (4-hydroxy-3-methoxy benzaldehyde) by a single-step oxidation of ferulate moiety of rice straw, a renewable agricultural waste. This is a chemical method where vanillin is produced from a renew...
07/15/2008
7393983Method and apparatus for separating aromatic dialdehyde
The present invention relates to a method and an apparatus for continuously separating aromatic dialdehyde from a reaction mixture obtained by gas-phase oxidation of dimethylbenzene. The method for continuously separating aromatic dialdehyde includes the steps of co...
07/01/2008
7354928Small molecule inhibitors targeted at Bcl-2
The present invention relates to small molecule antagonists of Bcl-2 family proteins such as Bcl-2 and/or Bcl-XL. In particular, the present invention provides non-peptide cell permeable small molecules (e.g., tricyclo-dibenzo-diazocine-dioxides) that bin...
04/08/2008
7342046Gossypol co-crystals and the use thereof
This invention relates to compositions comprising co-crystals of (−)-gossypol with a C1-8 carboxylic acid or C1-8 sulfonic acid which are useful as inhibitors of Bcl-2 family proteins. The invention also relates to the use of co-crystals of (...
03/11/2008
7183442Purification method of terephthal aldehyde
The present invention relates to a method for preparing high-purity terephthalaldehyde from terephthalaldehyde crystal containing impurities by recrystallization using an antisolvent. Low-purity terephthalaldehyde prepared by a conventional method, which contains a ...
02/27/2007
7145043Non-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
7001880Method of collection of fragrance ingredient, perfume composition containing this fragrance ingredient and cosmetics containing this fragrance ingredient
A method of collection of the fragrance ingredient of fragrant wood comprises extracting an essential oil ingredient by a solvent from the fragrant wood and collecting the fragrance ingredient in a vapor-phase by heating the extract, a perfume composition contains t...
02/21/2006
6727391Method 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
6686507Purification of 2-methoxy-5-trifluoromethoxybenzaldehyde
A process for the purification of 2-methoxy-5-trifluoro-methoxy benzaldehyde oil in which the oil is converted to amine by reaction of a nitroaniline with the oil; the imine is isolated as a solid; and the solid imine is converted back to the 2-methoxy-5-...
02/03/2004
6670510Process for preparing 2,5-dimethoxy benzaldehyde
The present invention recites a process for the of 2,5-dimethoxy-benzaldehyde by reacting a 2-hydroxy-5 methoxy-benzaldehyde with a suitable metal hydroxide in the presence of a suitable solvent to make a metal salt of 2-hydroxy-5-methoxy benzaldehyde com...
12/30/2003
6624330Method for stabilizing phenylacetaldehyde
The present invention relates to a method for stabilizing phenylacetaldehyde by adding at least one additive, in which case the additive contains one or more polybasic carboxylic acids....
09/23/2003
6531634Non-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 o...
03/11/2003
6486358Process for the purification and formulation of o-phthalaldehyde
Improved process for the purification and formulation of o-phthalaldehyde in which crude o-phthalaldehyde, obtained by cleavage of an acetal of o-phthalaldehyde by means of acidic hydrolysis, is, optionally by adding an aqueous basic solution, adjusted to...
11/26/2002
6437176Method for preparing aromatic carboxylic acids, aromatic aldehydes, and aromatic alcohols
An aromatic carboxylic acid, aromatic aldehyde, and aromatic alcohol are simultaneously and efficiently prepared by liquid phase oxidizing an aromatic compound represented by formula (I) with a gas containing molecular oxygen, in a presence of a catalyst ...
08/20/2002
6355843Purification of carboxaldehyde
The invention is directed to the process of purifying 4'-chloro-4-biphenylcarboxaldehyde....
03/12/2002
6245945Selective hydrolysis of acetals or ketals in the presence of phthalides
A process for the selective hydrolysis of acetals in the presence of phthalides comprises reacting a mixture (M) comprising a) a phthalide of the formula (I) ##STR1## where: R1,R2,R3 and R4 : are independently hydrog...
06/12/2001
6153789Purification of aqueous dye solutions
The present invention provides a method of purifying an aqueous dye solution having an aldehyde and/or ketone impurity including a step of reacting the impurity with a hydrazine derivative, forming a water-insoluble hydrazone compound. The hydrazone compo...
11/28/2000
5872153Process for preparing aqueous o-phthalaldehyde-glutaraldehyde solutions
A process for preparing an aqueous o-phthalaldehyde-glutaraldehyde solution which comprises converting an acetal of the o-phthalaldehyde in a 10 to 60% strength aqueous glutaraldehyde solution into o-phthalaldehyde at room temperature up to 100° C. by el...
02/16/1999
5861286Biochemical process for preparing aromatic substances
The present invention relates to a process for the preparation of aromatic substances having formula (I), characterized in that a substrate having formula (II) is subjected to an oxydation in the presence of at least one protein and at least one metal ion...
01/19/1999
5772909Process for separation of vanillin from other chemicals by means of azeotropic distillation with dibenzyl ether and mixtures of vanillin and dibenzyl ether used in such process
Vanillin is difficult to separate from second organic chemicals produced therewith such as parahydroxybenzaldehyde by conventional distillation or rectification because of the proximity of their boiling points. Vanillin can now be readily separated from s...
06/30/1998
5773664Process for the recovery of 4-hydroxybenzaldehyde from reaction mixtures containing same
A process for separating off poorly soluble by-products from reaction mixtures which are produced in the oxidation of p-cresol with oxygen or an oxygen-containing gas in methanol as solvent in the presence of alkali metal hydroxide and in the presence of ...
06/30/1998
5510006Process for separation of vanillin by means of azeotropic distillation with dibenzyl ether
Vanillin is difficult to separate from second organic chemicals produced therewith such as parahydroxybenzaldehyde by conventional distillation or rectification because of the proximity of their boiling points. Vanillin can now be readily separated from s...
04/23/1996
5463137Process for the production of oxo products
A propylene stream which contains propane as an impurity is contacted with carbon monoxide and hydrogen in the presence of a hydroformylation catalyst thereby producing a product stream containing butyraldehyde and/or n-butyl alcohol, unreacted propylene ...
10/31/1995
5430194Process for improving enantiomeric purity of aldehydes
The present invention relates to a process for producing an optically active aldehyde (first aldehyde) containing a reduced amount of the corresponding enantiomeric aldehyde (second aldehyde) which process comprises: (1) providing an initial solution cont...
07/04/1995
5410090Airless cobalt demetalling in the cobalt flash combination catalyst cycle
A method for removing cobalt values from the crude product of a cobalt-catalyzed hydroformylation reaction by the application of an airless cobalt demetalling step upstream of the stripping step of a Cobalt Flash hydroformylation catalyst recovery process...
04/25/1995
5354909Processes for isolating hydroxyaldehyde isomers
A process for isolating 4-hydroxybutanal and 3-hydroxy-2-methylpropanal from aqueous mixtures of the isomers is disclosed. Reaction of the aqueous mixture with a hydroxy compound in the presence of an acidic catalyst and a nonpolar organic solvent gives a...
10/11/1994
5162577Process for lithiation of 1,3-bis(trifluoromethyl)benzene
A novel process for the lithiation of 1,3-bis(trifluoro-methyl)benzene in a solvent is described, said process comprising carrying out the lithiation with the lithium salt of an amine of the general formula R1 R2 NH ...
11/10/1992
5149882Purification of 2-chloro-5-nitrobenzaldehyde or acetals thereof
2-chloro-5-nitrobenzaldehyde or an acetal thereof is isolated from a mixture of isomers thereof at a temperature of from -10° to +140° C., by suspending the mixture of isomers in a solvent or solvent mixture....
09/22/1992
5077441Selective gossypol abatement process from oil extraction of cottonseed
A method for the treatment of plant material to provide a protein-rich product and oil relatively free of gossypol. The process includes the steps of: a. contacting plant material with an aqueous monohydric alcohol solvent to extract oil and gossypol from...
12/31/1991
5059717Method for purification of 2,2'-di(1,6,7-trihydroxy-3-methyl-5-isopropyl-8-naphthaldehyde)
The method according to the present invention comprises purification of 2,2'-di-(1,6,7-trihydroxy-3-methyl-5-isopropyl-8-naphthaldehyde) by crystallization from a solution thereof in diethyl ether with a concentration of 0.002-0.2 g/ml by adding 0.25-3 pa...
10/22/1991
4933499Process for purification of alkenyl aromatic compounds containing a benzaldehyde impurity
The invention relates to a process for the purification of alkenyl aromatic compounds which contain benzaldehyde as an impurity. This process comprises steps for contacting a benaldehyde-containing alkenyl aromatic compound with a bisulphite treating agen...
06/12/1990
4929767Treatment of rhodium catalysts
A process for treating an organic solution of a partially deactivated solubilized rhodium-tertiary organophosphine complex hydroformylation catalyst with an organic reagent in order to improve the extractability of rhodium therefrom into an aqueous soluti...
05/29/1990
4898990Process for the extraction of vanillin
A process for the extraction of vanillin by means of the extraction from a vanillin-containing, water-containing, liquid mixture of substances with carbon dioxide at a temperature of 0° to 110° C. as well as a pressure of 30 to 400 bar and a subsequent ...
02/06/1990
4847422Method for the production of vanillin
The invention relates to a method for the production of vanillin in the form of a very pure product by oxidizing lignin contained in the wood pulping liquor. According to the invention the separation and purification of vanillin from the reaction mixture ...
07/11/1989
4772754Process for the isolation of p-hydroxybenzaldehyde
The invention relates to a process for the isolation of p-hydroxybenzaldehyde from the reaction mixture obtained by oxidizing p-cresol with oxygen or oxygen-containing gases in methanol in the presence of Na or K hydroxide and an Mn, Ni, Cr or Co salt. Th...
09/20/1988
4748278Process for the isolation of p-hydroxybenzaldehyde
The invention relates to a process for the isolation of p-hydroxybenzaldehyde from the reaction mixture obtained by oxidizing p-cresol with oxygen or oxygen-containing gases in methanol in the presence of Na or K hydroxide and an Mn, Ni, Cr or Co salt. Th...
05/31/1988
4714783Separation of nitrobenzaldehyde isomers
A process for separating ortho- or meta-nitrobenzaldehyde from a feed mixture comprising ortho-nitrobenzaldehyde or metal-nitrobenzaldehyde and at least one other isomer from which the ortho- or metal-isomer is to be separated. The feed mixture is contact...
12/22/1987
4652684Vanillin extraction process using large pore, high silica/alumina ratio zeolites
A spent lignin fermented waste-liquor solution containing vanillin is treated to remove the vanillin by contacting it with a suitable large pore zeolite....
03/24/1987
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