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| Number | Title | Issue Date |
| 7781622 | Process for direct hydroxylation of aromatic hydrocarbons The present invention provides a process for direct hydroxylation of aromatic hydrocarbons like benzene to phenol, toluene to cresols and anisole to methoxy phenols by using hydrogen peroxide as environmentally benign oxidant in polar solvent like acetonitrile using... | 08/24/2010 |
| 7329770 | Esters as useful broad spectrum herbicidal compounds The instant invention relates to the discovery of certain novel herbicidal esters of agriculturally active acids. These esters present agronomical advantages over traditional herbicidal products by presenting multiple herbicidal mechanisms that ensure activity over ... | 02/12/2008 |
| 7323608 | Copper-catalyzed formation of carbon-heteroatom and carbon-carbon bonds One aspect of the present invention relates to copper-catalyzed carbon-heteroatom and carbon-carbon bond-forming methods. In certain embodiments, the present invention relates to copper-catalyzed methods of forming a carbon-sulfur bond between the sulfur atom of a t... | 01/29/2008 |
| 7262147 | Method for preparing dehydrocyclodimerization catalyst This invention relates to a process for reactivating a dehydrocyclodimerization catalyst. Dehydrocyclodimerization catalysts which contain an aluminum phosphate binder can be deactivated when they are exposed to hydrogen at temperatures above 500° C. The instant pr... | 08/28/2007 |
| 7241908 | Process for the direct synthesis of hydrogen peroxide The invention is directed to the preparation of organic or aqueous-organic hydrogen peroxide solutions by direct synthesis from a non-explosive gaseous mixture containing hydrogen and oxygen. The process is carried out in the presence of a noble metal catalyst, usin... | 07/10/2007 |
| 7148386 | Processes for preparing benzoquinones and hydroquinones A process for the preparation of hydroquinone compounds comprising, reacting an aromatic hydroxy compound with an oxidizing agent in a biphasic solvent system. The reaction is carried out in the presence of a transition metal hydroxy phosphate catalyst to produce th... | 12/12/2006 |
| 7115784 | Copper-catalyzed formation of carbon-heteroatom and carbon-carbon bonds The present invention relates to copper-catalyzed carbon-heteroatom and carbon-carbon bond-forming methods. In certain embodiments, the present invention relates to copper-catalyzed methods of forming a carbon-nitrogen bond between the nitrogen atom of an amide or a... | 10/03/2006 |
| 7038093 | Integrated process for the preparation of phenol from benzene with recycling of the by-products The invention relates to a process for the preparation of phenol comprising the following phases: 1) preparation in continuous of phenol by means of the direct oxidation of benzene with hydrogen peroxide operating with an H2O2/benz... | 05/02/2006 |
| 6943270 | High selective method of producing cumene hydroperoxide, phenol and acetone in an oxidation by-product conversion process A cumene process of producing phenol and acetone comprises the joint oxidation of aldehydes and dimethylbenzene alcohol by aqueous hydrogen peroxide solutions in presence of 16 wt % to 94 wt % of cumene hydroperoxide by contacting of mutually insoluble phases of the... | 09/13/2005 |
| 6936738 | Process for the preparation of phenol by means of the hydrodeoxygenation of benzene-diols A process is described for the preparation of phenol characterized in that the phenol is obtained by means of the hydrodeoxygenation of benzene-diols with hydrogen, operating in continuous, in an aqueous solution, at temperatures ranging from 250 to 500° C., at pre... | 08/30/2005 |
| 6843978 | Microporous materials (TIQ-6 and METIQ-6) of high surface area active in oxidation reactions The present invention refers to a microporous material formed by oxygen, silicon, germanium, aluminum, boron, gallium, zirconium and/or titanium in its composition, called TIQ-6, to its catalytic applications in oxidation reactions, and to a method of the TIQ-6 mate... | 01/18/2005 |
| 6828466 | Process for the synthesis of phenols from arenes A process to synthesize substituted phenols such as those of the general formula RR′R″Ar(OH) wherein R, R′, and R″ are each independently hydrogen or any group which does not interfere in the process for synthesizing the substituted phenol including, but not... | 12/07/2004 |
| 6768013 | Intrinsically safe oxidation process A novel process for the direct oxidation of hydrogen and hydrocarbons is disclosed, where the explosion risks inherent in gas phase oxidations are substantially eliminated. Gaseous oxidation reactants are soluble in a first reaction solvent phase such as a perfluoro... | 07/27/2004 |
| 6649140 | Process for the continuous production of hydrogen peroxide A process is described for the continuous production of alcoholic or hydro-alcoholic solutions of hydrogen peroxide in a concentration ranging from 2 to 10% by weight and their direct use in oxidation processes. The process operates under high safety condition... | 11/18/2003 |
| 6531615 | Process for the oxidation of cyclohexanone to &3xb5;-caprolactone This invention relates to a composition comprising antimony trifluoride and silica, a method for the preparation of said composition and use of said composition as a catalyst in a process for the oxidation of cyclohexanone to &3xb5;-caprolactone.... | 03/11/2003 |
| 6479711 | Process for producing aromatic hydroxy compound A process for producing an aromatic hydroxy compound having hydroxyl group at the para-position with respect to a hydroxy or an alkoxy substituent group present in the aromatic ring at a high yield and at a high selectivity, using a novel and useful hydro... | 11/12/2002 |
| 6410805 | Method and composition for hydroxylation of aromatic substrates A method and composition are disclosed for the hydroxylation of aromatic substrates in the presence of oxygen, hydrogen, and a catalyst. In a preferred embodiment, benzene is oxidized to phenol in the presence of oxygen, a vanadium catalyst, and hydrogen.... | 06/25/2002 |
| 6350921 | Process for the production of a dihydroxybenzene and dicarbinol from diisopropylbenzene Improved methods for the simultaneous production of dihydroxybenzene and dicarbinol from diisopropylbenzene are provided. These methods provide for continuous and simultaneous production of diisopropylbenzene dihydroperoxide (DHP) and diisopropylbenzene h... | 02/26/2002 |
| 6323377 | Oxidation process Preparation of 2,5-dichlorophenol by selectively oxidizing 1,4-dichlorobenzene using a peroxo-, hydroperoxo-, superoxo- or alkylperoxo-metal species in the presence of form or an alkanoic acid.... | 11/27/2001 |
| 6284213 | Catalyst, process for the production of hydrogen peroxide and its use in oxidation processes The present invention relates to a catalyst consisting of a metal of the VIII group supported on acid activated carbon functionalized with sulfonic groups, a process for the synthesis of hydrogen peroxide from hydrogen and oxygen which uses said catalyst ... | 09/04/2001 |
| 6239317 | Process for the production of halogeno-o-hydroxydiphenyl compounds There is described a four step process for the production of halogeno-o-hydroxydiphenyl compounds having the formula ##STR1## in which X is --O--or --CH2 --; m is 1 to 3; and n is 1 or 2; wherein in the first step, a diphenyl compound is chlorinated... | 05/29/2001 |
| 6187964 | Method of producing phenol compound A method of producing a phenol compound comprising a step of oxidizing an aromatic aldehyde to an aryl formate and an aromatic carboxylic acid with an oxygen-containing gas, and a step of decomposing the aryl formate to the phenol compound. To facilitate ... | 02/13/2001 |
| 6180836 | Preparation of phenol via one-step hydroxylation of benzene catalyzed by copper-containing molecular sieve The invention relates to a novel one-step process for preparation of phenol by oxidation of benzene with hydrogen peroxide catalyzed by molecular sieves doped with copper ions. With proper solvent, a phenol yield around 15-35%, selectivity close to 100% a... | 01/30/2001 |
| 6156939 | Process for the hydroxylation of aromatic hydrocarbons The invention relates to a process for the hydroxylation of aromatic hydrocarbons by direct oxidation with hydrogen peroxide. The process is carried out in the presence of a catalyst comprising: iron, administered as inorganic salt; iron ligand, consisting of ... | 12/05/2000 |
| 6133487 | Process for the oxidation of aromatic compounds to hydroxyaromatic compounds An improved process is described for the synthesis of hydroxylated aromatic compounds by means of the oxidation of an aromatic substrate with hydrogen, peroxide in an organic solvent, in the presence of synthetic zeolites, wherein the improvement consists... | 10/17/2000 |
| 6118029 | Process for producing 3,3',5,5'-tetra-t butylbiphenol A batch or continuous process produces highly pure 3,3',5,5'-tetra-t-butylbiphenol suitable as a starting material for the synthesis of 4,4'-biphenol. The process for producing 3,3',5,5'-tetra-t-butylbiphenol comprises conducting an oxidation coupling ... | 09/12/2000 |
| 6080895 | Process of producing catechol derivatives An improved process for producing a catechol derivative (1) useful as a intermediate of pharmaceuticals and agricultural chemicals, being shown by the following reaction scheme. The process is characterized in that formulation in the first step is carried... | 06/27/2000 |
| 6040484 | Phenol compound hydroxylation method The present invention relates to a process for the hydroxylation of phenolic compounds and, more particularly, to a process for the hydroxylation of phenols and phenolic ethers with hydrogen peroxide. The invention relates to a process for the hydroxylati... | 03/21/2000 |
| 5965476 | Silica/zeolite composite materials in spherical form and process for their preparation The present invention relates to silica/zeolite composite materials in spherical form and the process for their preparation which occurs by the dispersion of submicronic particles of titanium silicalite, beta zeolite, or mixtures of beta zeolite with tita... | 10/12/1999 |
| 5840997 | Method for the production of alkoxy- and aryloxy-phenols Alkoxybenzaldehydes and aryloxybenzaldehydes are converted to the corresponding phenols by reacting the benzaldehydes in an organic solvent phase with formic acid and hydrogen peroxide in an aqueous solvent phase to produce the corresponding formate ester... | 11/24/1998 |
| 5811599 | Process for the selective oxidation of hydrocarbons and their derivatives A process for the oxidation of hydrocarbons and their derivatives having the general formula RX, wherein R is from n-alkyl, iso-alkyl, benzyl, cyclohexyl, mono, di or tricyclic aryl, or alkenic groups and X is selected from H, OH or Cl to compounds having... | 09/22/1998 |
| 5670465 | Preparation of p-fuchsones and synthesis of p-dihydroxylated aromatic compounds therefrom p-Dihydroxylated aromatic compounds are prepared via the oxidation of p-fuchsones, the latter advantageously being synthesized by reacting a phenolic compound having at least one hydrogen atom in the para-position to the hydroxyl function with a non-enoli... | 09/23/1997 |
| 5616734 | Process for the catalytic oxidation of aromatic compounds The invention relates to the use of compounds of the formula I R1a Reb Oc (I), where a is from 1 to 6, b is from 1 to 4 and c is from 1 to 14 and the sum of a, b and c is in accordance with the... | 04/01/1997 |
| 5569791 | Production of phenol from a hydrocarbon feedstock Phenol is produced from a hydrocarbon feedstock using a process combination offering unexpected synergy. Benzene is produced from the hydrocarbon feedstock using a highly selective aromatization catalyst which provides substantial quantities of high-purit... | 10/29/1996 |
| 5559274 | Production of phenol from a hydrocarbon feedstock Phenol is produced from a hydrocarbon feedstock using a process combination offering unexpected synergy. Benzene is produced from the hydrocarbon feedstock using a highly selective aromatization catalyst which provides substantial quantities of high-purit... | 09/24/1996 |
| 5493061 | Process for the conversion of phenol to hydroquinone and catechol This invention relates to a process for the oxidation of phenol to a mixture of hydroquinone and catechol using hydrogen peroxide as oxidant in the presence of titanium silicate molecular sieves in a multistage fixed bed reactor.... | 02/20/1996 |
| 5426244 | Method for preparing dihydric phenols Phenols are reacted with a hydrogen peroxide in the presence of a crystalline titanosilicate catalyst and a cyclic ether, such as dioxane, as a solvent. The method provides especially high para-selectivity compared with conventional methods, and, at the s... | 06/20/1995 |
| 5414155 | Preparation of o-dihydroxylated aromatic compounds via oxidation of o-fuchsones o-Dihydroxylated aromatic compounds, for example pyrocatechol, are selectively prepared by reacting an o-fuchsone with an oxidizing agent, for example hydrogen peroxide, optionally in the presence of a catalytically effective amount of an acid catalyst.... | 05/09/1995 |
| 5387724 | Selective hydroxylation of phenol or phenolic ethers Phenols, and related aromatic compounds, phenolic ethers, can be hydroxylated selectively using hydrogen peroxide in the presence of an amorphous or microcrystalline zirconium phosphate catalyst in a solvent containing an aliphatic carboxylic acid. The pr... | 02/07/1995 |
| 5364983 | Process for the preparation of aromatic polyhydroxy compounds The present invention relates to a process for the preparation of aromatic polyhydroxy compounds, by reacting an aromatic hydroxyaldehyde with hydrogen peroxide, with or without the addition of a base, in the presence of a nitrile R--CN, in which R is an ... | 11/15/1994 |
