- PROCESS FOR PRODUCTION OF DIALKYLHYDROPEROXYBENZENES
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To provide a method for producing dialkylhydroperoxybenzene by liquid-phase oxidation of dialkylbenzene, wherein the method comprises the following steps, Oxidation step: a step of obtaining a oxidation reaction liquid having pH of 9 to 12, which contains dialkylhydroperoxybenzene, unreacted dialkylbenzene, and by-produced hydroperoxybenzenes by subjecting an oxidation raw material solution containing dialkylbenzene to oxidation reaction, Aqueous solution extracting step: a step of extracting the oxidation reaction liquid with an alkaline aqueous solution to obtain a water layer mainly containing dialkylhydroperoxybenzene and by-produced hydroperoxybenzenes, and an oil layer mainly containing dialkylbenzene, and Recycle step: a step of recycling and feeding at least a part of the oil layer obtained in the aqueous solution extracting step to the oxidation step, wherein the oxidation step comprises two or more reaction sections of a first section and subsequent sections arranged in series, and the temperature of the first reaction section is set to be higher than an average temperature of the whole reaction sections by 2.5°C or more.
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Page/Page column 4-5
(2008/12/08)
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- Process for producing alkyl aromatic hydroperoxide
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A process for producing an alkyl aromatic hydroperoxide, which comprises oxidizing an alkyl aromatic compound with an oxygen-containing gas in the presence of a water-soluble iron compound, wherein a concentration of the iron compound in the oxidation reaction system is 0.0001 to 10 ppm by weight in terms of iron metal.
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Page/Page column 2
(2008/06/13)
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- PROCESS FOR PRODUCING PHENOLS
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A process for producing a phenol, which comprises the following steps of: (1) oxidizing an alkylbenzene with an oxygen-containing gas to obtain an oxidation reaction mixture containing a hydroperoxide;(2) subjecting the oxidation reaction mixture to extraction operation with an alkaline aqueous solution to obtain an extract containing the hydroperoxide;(3) subjecting the extract obtained in the step (2) to extraction operation with an organic solvent to obtain an extract containing the hydroperoxide;(4) subjecting the extract obtained in the step (3) to water washing to obtain an oil layer containing the hydroperoxide, in which a content of the alkali has been reduced; and(5) subjecting the hydroperoxide contained in the oil layer obtained in the water washing step (4) to acidolysis to obtain a phenol,wherein a concentration of the hydroperoxide to be subjected to the water washing in the step (4), is 20% by weight or less.
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Page/Page column 2-3
(2008/06/13)
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- PROCESS FOR PRODUCING DIHYDROXYBENZENE AND DIISOPROPYLBENZENDICARBINOL
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A process for simultaneously producing a dihydroxybenzene and a diisopropylbenzene dicarbinol, which contains subjecting a diisopropylbenzene with an oxygen containing gas to obtain an oxidation reaction mixture containing a diisopropylbenzene dihydroperoxide and a diisopropylbenzene hydroxy hydroperoxide followed by an extraction separation step, a decomposition step, a distillation separation step, a reduction step and a post-treatment step in this order, the process containing purifying the diisopropylbenzene dicarbinol from the liquid containing the diisopropylbenzene dicarbinol obtained in the reduction step through purification operations containing crystallization, filtration and subsequent drying, and supplying a filtrate obtained by the filtration to the decomposition step and/or distillation separation step.
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Page/Page column 3-4
(2008/06/13)
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- Process for the production of a dihydroxybenzene and dicarbinol from diisopropylbenzene
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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 hydroxyhydroperoxide (HHP) using Karr Column extractors operated in series. A very high purity DHP-containing solution, the precursor to the dihydroxybenzene, can be produced according to the reported methods. A safe and efficient method for producing dicarbinol from HHP is also disclosed.
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- Oxidation of m-diisopropylbenzene in the presence of chelate compounds of copper with amino acids
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In the oxidation of m-diisopropylbenzene to hydroperoxides chelate compounds of copper with amino acids can play the role of catalyst or inhibitor, depending on the structure of the ligand.The copper salts of glycine, alanine, phenylalanine, threonine, and tryptophan reduce the induction period and increase the oxidation rate of diisopropylbenzene, while the copper salts of lysine, arginine, and tyrosine inhibit the process.
- Pavlov, G. P.,Sinovich, I. D.,Bykova, N. V.
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p. 1084 - 1086
(2007/10/02)
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