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| Number | Title | Issue Date |
| 7417171 | Method for preparing an aromatic dialdehyde and manufacturing system for the same The present invention relates to a method for preparing an aromatic dialdehyde, comprising, a) a step of gas phase oxidation reaction for preparing aromatic dialdehyde from dimethyl benzene; b) a step of separation for selectively recovering crude aromatic dialdehyd... | 08/26/2008 |
| 7402709 | Process for synthesizing heliotropine and its derivatives A new high-yield, easily industrialized process for synthesizing compounds of formula (IV), in which X1 and X2, the same or different, are linear or branched C1-C8 alkyls, n and m are 0, 1 or 2, with the proviso that n and m are not simultaneou... | 07/22/2008 |
| 7256760 | Semiconductor device A systemized active matrix display in which a pixel matrix circuit, a driver circuit and a logic circuit are mounted on the same substrate, is formed. A TFT of the present invention has such characteristics as to be able to operate in a wide driving frequency range ... | 08/14/2007 |
| 7211157 | Rare-earth alloy, rare-earth sintered magnet, and methods of manufacturing A rare-earth alloy ingot is produced by melting an alloy composed of 20–30 wt % of a rare-earth constituent which is Sm alone or at least 50 wt % Sm in combination with at least one other rare-earth element, 10–45 wt % of Fe, 1–10 wt % of Cu and 0.5–5 wt % o... | 05/01/2007 |
| 7183442 | Purification 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 |
| 7094925 | Oxidation of alkyl-aromatic compounds A process for the oxidation of an alkyl-aromatic compound, wherein the aromatic compound is admixed with an oxidising agent or sulfur compound in the presence of an ionic liquid is described. In this process, air, dioxygen, peroxide, superoxide, any other form of ac... | 08/22/2006 |
| 6797844 | Process for producing phthalaldehyde A process for producing a phthalaldehyde which comprises reacting at least one compound selected between o-xylylene glycol and o-xylylene oxide with nitric acid. The nitric acid is used in an amount of about 0.2 to 20 mol per mol of the compound selected between o-x... | 09/28/2004 |
| 6608229 | Oxidation of polysaccharides with nitroxyls A simplified process for oxidizing starch and other polysaccharides in an aqueous solution or suspension using hypochlorite in the presence of a catalytic amount of a nitroxyl compound is described. The oxidation is process is bromide-free and is carried ... | 08/19/2003 |
| 6518419 | Process for selective oxidation of primary alcohols Primary alcohols, especially in carbohydrates, can be selectively oxidized to aldehydes and carboxylic acids in a low-halogen process by using a peracid in the presence of a catalytic amount of a di-tertiary-alkyl nitroxyl (TEMPO) and a catalytic amount o... | 02/11/2003 |
| 6495726 | Process for the production of benzaldehyde by the catalytic liquid phase air oxidation of toluene The present invention relates to an improved process for the production of benzaldehyde with 40-50% selectivity comprising by catalytic liquid phase air oxidation of toluene. The process involves providing a continuous flow of air in the presence of a cat... | 12/17/2002 |
| 6458737 | Catalyst for oxidizing methylbenzenes and method for producing aromatic aldehyde The present invention has for its object to provide a novel catalyst by use of which methylbenzenes can be oxidized in gaseous phase in the presence of molecular oxygen to give the corresponding aromatic aldehydes in high yields, a process for producing a... | 10/01/2002 |
| 6399838 | Process for preparing 2,6-dimethylphenol A process for preparing 2,6-dimethylphenol from 2,4,6-trimethylphenol is provided. The process includes two steps: (1) selective oxidation of 2,4,6-trimethylphenol to 3,5-dimethyl-4-hydroxybenzaldehyde and (2) deformylation of the resulting benzaldehyde t... | 06/04/2002 |
| 6245936 | Process for the selective preparation of a 2-hydroxybenzoic acid and a 4-hydroxybenzaldehyde and derivatives thereof The present invention concerns a process for the preparation of a 2-hydroxybenzoic acid and of a 4-hydroxybenzaldehyde and derivatives thereof from a mixture of two phenolic compounds, one carrying a formyl or hydroxymethyl group in the 2 position, and th... | 06/12/2001 |
| 6184421 | Method for preparing a 4-hydroxybenzaldehyde and derivatives The present invention concerns a process for the preparation of a 4-hydroxybenzaldehyde and its derivatives. More particularly, the invention concerns the preparation of 3-methoxy-4-hydroxybenzaldehyde and 3-ethoxy-4-hydroxybenzaldehyde, respectively know... | 02/06/2001 |
| 5877355 | 2-hydroxy-5-alkyl-beta-methylstyrene and process of preparing hydroxyarylaldehydes therefrom Process for making an alkyl-substituted salicylaldehyde wherein the alkyl substitution amounts to at least 8 alkyl carbon atoms per molecule, and preferably not more than 25, comprising ozonolizing an alkyl-substituted 2-hydroxy beta-methylstyrene wherein... | 03/02/1999 |
| 5877330 | Vanadium-containing catalysts, process for manufacturing and use of the same Vanadium-containing catalysts are obtained by using polyvanadic acid as a source of vanadium. Vanadium-containing catalysts are obtained by mixing catalyst components other than vanadium, or their precursors, with a polyvanadic acid sol which is formed by... | 03/02/1999 |
| 5861286 | Biochemical 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 |
| 5856583 | Synthesis of 2-hydroxyarylaldehydes A method for the preparation of 2-hydroxyarylaldehydes from an aryloxy magnesium compound and formaldehyde, which comprises reacting at a temperature from 40°-120° C., an aryloxy magnesium compound having an aryloxy anion and a non-aryloxy anion and in ... | 01/05/1999 |
| 5811559 | Preparation of hydroxybenzaldehyes Hydroxybenzaldehydes, for example salicylaldehyde, are prepared in high yields by oxidizing the corresponding hydroxybenzyl alcohols, e.g., saligenol, with molecular oxygen or an oxygen-containing gas, in liquid phase, in an aqueous reaction medium contai... | 09/22/1998 |
| 5811587 | Process for the hydroxyalkylation of a carbocyclic aromatic ether The present invention concerns a process for the hydroxyalkylation of a carbocyclic aromatic ether. The invention preferably relates to the preparation of 3-methoxy-4-hydroxybenzyl alcohol by the hydroxymethylation of guaiacol. It also concerns the oxidation o... | 09/22/1998 |
| 5783737 | Process for the preparation of 3-carboxy-4-hydroxybenzaldehides and derivatives thereof The present invention concerns a process for the preparation of 3-carboxy-4-hydroxybenzaldehydes and derivatives thereof from phenolic compounds carrying formyl and/or hydroxymethyl groups in the 2 and 4 positions. The invention also concerns the preparat... | 07/21/1998 |
| 5773664 | Process 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 |
| 5693869 | Process for the single step oxidation of 3-phenoxytoluene to 3-phenoxybenzaldehyde This invention relates to an improved process for the single step oxidation of 3-phenoxytoluene to 3-phenoxybenzaldehyde using molecular oxygen as the oxidant by employing a Ti2 VMoP6 O24 catalyst having particular infrare... | 12/02/1997 |
| 5689009 | Preparation of hydroxybenzaldehydes Hydroxybenzaldehydes, for example salicylaldehyde, are prepared in high yields by oxidizing the corresponding hydroxybenzyl alcohols, e.g., saligenol, with molecular oxygen or an oxygen-containing gas, in liquid phase, in an aqueous reaction medium contai... | 11/18/1997 |
| 5475156 | Method for making a 2,6-dialkylphenol A method is provided for converting a 2,4,6-trialkylphenol, such as mesitol, to a dialkylphenol, for example 2,6-dimethylphenol, by effecting the selective oxidation of the 2,4,6-trialkylphenol, followed by the deformylation of the resulting 3, 5-dialkyl-... | 12/12/1995 |
| 5354919 | Oxidation of aromatic compounds substituted by oxidizable alkyl moieties Aromatic compounds bearing oxidizable alkyl substituents, e.g., alkoxylated and/or hydroxylated such substrates, notably the phenolics/cresols, are selectively oxidized, e.g., into hydroxybenzaldehydes, by reacting same with appropriate oxidizing agents, ... | 10/11/1994 |
| 5354920 | Chemical process for the preparation of a 2-hydroxyarylaldehyde A method for the preparation of a 2-hydroxyarylaldehyde which comprises reacting an aryloxymagnesium halide derived from a phenol having at least one free ortho position relative to the phenolic hydroxy group with formaldehyde or a formaldehyde-liberating... | 10/11/1994 |
| 5304685 | Preparation of 3-(hydroxyphenyl)propionaldehydes and their hydrogenation to 3-(hydroxyphenyl)propanols A process for preparing 3-(hydroxyphenyl)propionaldehydes of the formula I ##STR1## and, where appropriate, for preparing 3-(hydroxyphenyl)propanols of the formula II ##STR2## where R1, R2, R3 and R4 a... | 04/19/1994 |
| 5248816 | Process for making 2-hydroxymandelic acid and 2-hydroxybenzaldehydes A method for the preparation of a 2-hydroxymandelic acid of the formula ##STR1## wherein R represents an alkyl radical containing from 7 to 12 carbon atoms which comprises reacting glyoxylic acid with a phenol of the formula: ##STR2## under acid... | 09/28/1993 |
| 5136104 | Method for production of substituted benzaldehyde From a methoxy-, tertiary butyl-, or phenoxy-substituted toluene, a corresponding substituted benzaldehyde is obtained by the catalytic gas-phase oxidation of the substituted toluene with a molecular oxygen-containing gas in the presence of a catalyst com... | 08/04/1992 |
| 5130493 | Process for the preparation of o-hydroxy-benzaldehydes o-Hydroxy-benzaldehydes can be obtained by oxidation of the o-cresols, on which they are based, with oxygen in the presence of substances having a base reaction in a solvent if chelate complexes of iron, manganese or a mixuture of both with polyaza-macroc... | 07/14/1992 |
| 4978802 | Process for production of aromatic aldehydes Aromatic aldehydes are produced by oxidation with oxygen of a para-cresol derivative in a solvent, in the presence of a base and a catalytic amount of a cobalt compound. The catalyst is a chelated complex of cobalt with a rigid structure that is slightly ... | 12/18/1990 |
| 4929766 | Process are the preparation of p-hydroxy-benzaldehydes p-Hydroxy-benzaldehydes can be obtained by oxidation of the corresponding p-cresols with oxygen in the presence of basic substances in a solvent, the reaction being carried out in the additional presence of a chelate complex of iron and/or manganese. If d... | 05/29/1990 |
| 4915875 | Oxidation products of paramethyl-substituted hindered phenols Paramethyl-substituted hindered phenols are selectively oxidized by contacting with an oxidizing agent at elevated temperatures in the presence of a heterogeneous oxidative coupling catalyst. In the absence of an optional nucleophile the products comprise... | 04/10/1990 |
| 4814512 | Method for the production of p-methoxybenzaldehyde A method for the production of p-methoxybenzaldehyde by the vapor-phase catalytic oxidation of p-methoxytoluene, which method comprises cooling and condensing a mixed gas formed by said reaction of oxidation thereby preparing a solution containing p-metho... | 03/21/1989 |
| 4772754 | Process 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 |
| 4748278 | Process 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 |
| 4709088 | Process for producing 2,6-naphthalene-dicarboxylic acid A process for producing 2,6-naphthalenedicarboxylic acid which comprises oxidizing 2,6-diisopropylnaphthalene or its oxidation product as a starting material with molecular oxygen in a reaction medium containing at least 50% by weight of an aliphatic mono... | 11/24/1987 |
| 4700009 | Process for preparing a substituted benzaldehyde The present disclosure is concerned with a novel process for the manufacture of substituted benzaldehydes, namely of benzaldehydes of the formula ##STR1## wherein R represents a methoxy or tert.butyl group. The compounds of formula I are known s... | 10/13/1987 |
| 4691061 | Oxidation of acetovantillone to vanillin Vanillin is produced from alkaline oxidation treatment of acetovanillone or acetovanillone-rich internal waste streams of lignin processes without the need for utilizing nitrobenzene as an oxidizing agent.... | 09/01/1987 |
