Mitsubishi Petrochemical Company Limited

Mitsubishi Chemical Corporation

Masashi Inaba

Norioki Mine

Mitsugi Kataoka

Masayuki Honda

Mamoru Mizutani

Makoto Imanari

Hiroshi Iwane

Kimikatsu Jinno

Takahiro Sugawara

Yuji Ohgomori

Ryozo Hamana

Satoshi Ohtaka

Yoshikazu Higaki

Hideki Kurokawa

Shiroh Inui

Noriko Shimizu

Hideyuki Hase

Katsuaki Hasegawa

Tatsuro Ashizawa

Takamichi Suzuki

Norio Sato

Fujio Mizutani

A process for producing an unsymmetrical chain carbonic acid ester is described, which comprises reacting a first symmetrical chain carbonic acid ester with a second symmetrical chain carbonic acid ester or a monohydric alcohol in the presence of a catalyst comprising as an active catalyst component an oxide of at least one element selected from the Group IIIB elements of the periodic table.

Process for producing unsymmetrical chain carbonic acid ester

A process for preparing unsaturated dimers of .alpha.-methylstyrene comprising dimerizing .alpha.-methylstyrene using activated clay or acid clay as a catalyst, in which the dimerization is carried out in the presence of a carbonic acid ester, preferably ethylene carbonate, which process achieves high selectivity to unsaturated dimers with ease in controlling the reaction temperature.

Process for preparing alph-methylstyrene unsaturated dimer

4,4'-Biphenol is prepared through debutylation of 3,3', 5,5'-tetra-tert-butyl-4,4'-biphenol in an organic solvent in the presence of an acid catalyst wherein the debutylation is carried out continuously using at least two reactors aligned in series, with a high yield and high purity on an industrial level.

Method for preparing 4,4'-biphenol

A method of continuously distilling off the components of a mixture containing phenols, water and methanol using a single distillation column, wherein methanol is recovered from the top of the column, water containing phenols is dragged as a side stream from a recovery section of the column, and phenols are recovered as a bottom product. The method permits efficient separation by the single distillation column of the three components with high purity and low utility energy.

Method of separating components of phenols mixture by distillation

A process for preparing 4,4'-dihydroxybiphenyl is disclosed, which comprises debutylation of 3,3', 5,5'-tetra-t-butyl-4,4'-dihydroxybiphenyl in an organic solvent in the presence of an acid catalyst, wherein said debutylation is carried out in the presence of water and/or a lower alcohol. The desired product can be obtained at a high purity in a high yield.

Process for preparing 4,4'-dihydroxybiphenyl

Aromatic alcohol is produced by reducing aromatic hydroperoxide with hydrogen in a liquid phase, using a Pt catalyst solely or a catalyst containing Pt and at least one element selected from the group consisting Pb, Sn, Cu, As, Sb, In, Se and Bi in a fixed bed reactor.

Method for producing aromatic alcohol

A process for preparing p-cumylphenol which comprises reacting phenol and .alpha.-methylstyrene in the presence of an inorganic solid acid catalyst having an acid point of an acid strength Ho of up to -3, for example, activated clay and recovering the aimed p-cumylphenol from the reaction mixture thus obtained by distilling the same while introducing an inert gas such as nitrogen and/or steam into the distillation system is disclosed. The p-cumylphenol thus obtained has a high purity and an improved color compared with those obtained by conventional methods.

Process for preparing p-cumylphenol

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Mie, Japan

Masashi Inaba