Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2006-05-02
2006-05-02
Shippen, Michael L. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
Reexamination Certificate
active
07038093
ABSTRACT:
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/benzene ratio ranging from 10 to 70%, in a three-phase reaction system comprising a first liquid phase consisting of benzene and an organic solvent, a second liquid phase consisting of water, a solid phase consisting of an activated catalyst based on titanium silicalite TS-1;2) separation of the phenol and non-reacted benzene from the reaction mixture of the oxidation section (1), by means of fractionated distillation;3) separation of the solvent and by-products from the mixture coming from the distillation tail (2), by means of basic extraction;4) transformation of the by-products obtain in section (3) to phenol by means of hydrodeoxygenation with hydrogen operating in continuous, in aqueous solution, at a temperature ranging from 250 to 500° C., at pressures of 1-100 bar and in the presence of a catalyst based on elements of group VIB or their mixtures or group VIII of the periodic table or their mixtures;5) recycling of the phenol obtained in section (4) to the distillation section (2).
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Bianchi Daniele
Bortolo Rossella
Buzzoni Roberto
Cesana Alberto
D'Aloisio Rino
Polimeri Europa S.p.A.
Shippen Michael L.
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