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6399795 |
Method for producing 2-(4-methyl-3-pentenyl) anthraquinone
A method for producing 2-(4-methyl-3-pentenyl)anthraquinone (IHEAQ) that includes a Diels-Alder addition of naphtho-1,4-quinone and myrcene and an oxidation of the resulting adduct. The oxidation...
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6156155 |
Method for the delignification of lignocellulosic material by adding a dialkyl substituted octahydroanthraquinone
The present invention provides a method for the synthesis of substituted octahydroanthraquinones and substituted anthraquinones which are effective for pulping of lignocellulosics.
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5616734 |
Process for the catalytic oxidation of aromatic compounds
The invention relates to the use of compounds of the formula I R 1 a Re b O c (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,...
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5002634 |
Method for the delignification of wood pulp utilizing fused ring quinone compounds prepared from lignin or lignin derived substances
A method for the preparation of a mixture of fused ring quinone type compounds from lignin and lignin derived substances. The mixture of fused ring quinone compounds has been found useful in the...
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4822527 |
Process for preparation of anthraquinones and fluorenones
A process is disclosed for producing cyclized aromatic compounds by the liquid-phase air oxidation of 2-methyl-substituted biphenyls and diphenylmethanes in an acetic acid medium in the presence of...
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4477380 |
Oxidation process of reactive aromatics with reactivation of the catalyst using potassium permanganate
In the oxidation of reactive aromatics with molecular oxygen in carboxylic acid solution in the presence of a catalyst consisting of a cobalt compound and possibly with addition of a manganese and...
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4411818 |
Reactivation of vanadium-containing oxidation catalysts
A process for reactivating a vanadium-containing oxidation catalyst, wherein the catalyst is treated first at from 100° to 600° C., with a volatile phosphorus compound in the presence of an...
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4308211 |
Process for the preparation of anthraquinone
A process for the preparation of anthraquinone from 1, 4, 4a, 5, 8, 8a, 9a, 10a-octahydroanthraquinone (OHAQ) which comprises contacting OHAQ as a melt with a catalyst.
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4215063 |
Oxidation catalyst and use in the production of anthraquinone
Anthraquinone is prepared by the oxidation of diphenylmethane compounds in the gas phase in the presence of vanadium (V) oxide and a metal selected from ruthenium, rhenium, cerium, niobium and...
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4203906 |
Process for catalytic vapor phase oxidation
A process for catalytic vapor phase oxidation which comprises using a fixed-bed shell and tube heat exchange type reactor in which a bundle of a multiplicity of tubes filled with at least one type...
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4062872 |
Process of oxidizing hydrocarbons using catalysts with high heat conductivity
An improved catalyst structure for use in catalytic processes, consisting of a powdered catalyst, carrier, and metal fiber thoroughly mixed to assure a permanent uniform distribution of the metal...
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4002653 |
Manufacture of anthraquinone
Anthraquinone is manufactured by oxidation of diphenylmethane compounds in the gas phase, in the presence of vanadium(V) oxide and titanium dioxide in a specific weight ratio. The anthraquinone...
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3965251 |
Method of regenerating a degraded working solution for the production of hydrogen peroxide
A working solution comprising anthraquinone and its derivatives, used for the production of hydrogen peroxide on becoming degraded by formation of non-effective anthraquinone is generated by an...
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3932474 |
Preparation of antraquinone
There is provided a process for preparing anthraquinone in good yield and purity by subjecting either benzene or benzophenone and carbon monoxide in at least equimolar amounts to the action of...
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3931254 |
Process for the preparation of anthraquinone
A simple process for preparing anthraquinone in good yield from anthracene is described, which process comprises oxidising anthracene by means of oxygen or an oxygen-containing gas in the liquid...
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3925497 |
Substituted 1,3,7-octatrienes and their preparation
There are disclosed alkyl substituted 1,3,7-octatrienes of the formula ##SPC1## In which at least one of R 1 and R 4 is an alkyl group and the other is hydrogen when it is not an alkyl group, and...
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3873580 |
Oxidation Process
Process for the liquid phase oxidation of organic compounds, particularly the oxidation of an aromatic nucleus to the corresponding quinone, using an aqueous solution of a persulphate compound as...
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3855252 |
LIQUID PHASE OXIDATION OF CONDENSED-RING AROMATIC HYDROCARBONS
A process for oxidizing condensed-ring aromatic compounds, selected from the group consisting of anthracene, anthracene derivatives, fluorene, fluorene derivatives, mixtures of these materials with...
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3479374 |
PREPARATION OF QUINONES
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2954385 |
Production of maleic and phthalic anhydrides
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2860036 |
Purification of anthraquinone solutions
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1355098 |
Catalytic oxidation of anthracene
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