Ube Industries, Inc.

Agency of Industrial Science and Technology

Ems-chemie Ag

Ryoji Sugise

Shuji Tanaka

Katsumasa Harada

Takashi Doi

Keigo Nishihira

Masayuki Nishio

Koichi Kashiwagi

Sadao Niida

Hirofumi Ii

Tsunao Matsuura

Satoru Fujitsu

Toshihiro Shimakawa

Kohichi Kashiwagi

Yoichi Imbe

Masashi Shirai

Toshio Kurafuji

Yuki Nishida

Fumio Iwata

Kouichi Kashiwagi

Kazuaki Mii

Toshihiko Sumida

Masayuki Hirabayashi

Toshikazu Hamamoto

Kyoji Ohdan

Hideo Ihara

Akinori Shiotani

Hiroshi Daimon

Shinichi Yoshida

Itsuhiro Fujii

Katsutoshi Washio

Yutaka Asada

Iwao Okamoto

Ii Hirofumi

Kazuo Miyamoto

Toshitaka Fujii

Atsushi Kajima

Masatoshi Jo

Norio Terada

An alkyl nitrite is produced with high efficiency by bringing a nitrogen monoxide gas into contact with an aqueous solution of an alkyl alcohol and nitric acid in a reactor, which aqueous solution may be a liquid fraction generated in an alkyl nitrite-production process in which an alkyl alcohol is reacted with nitrogen monoxide and oxygen in a reaction column

Process for producing alkyl nitrite

In the process for producing a cyclododecanone by isomerizing an epoxycyclododecane-containing starting material in the presence of an isomerization reaction catalyst containing lithium bromide and/or lithium iodide, in order to perform the reaction with high efficiency (high reaction rate) and high selectivity and stably produce a high-purity cyclododecanone in industry while maintaining a high-level reaction rate, the epoxycyclododecane-containing starting material is produced by contacting an epoxycyclododecadiene with hydrogen in the presence of a hydrogen-reduction catalyst and has a content of the hydroxyl group-containing cyclododecane compounds contained in the epoxycyclododecane-containing starting material controlled to 5 mol % or less.

Process for preparation of cyclododecanone

An alkyl nitrite is produced with high efficiency by bringing a nitrogen monoxide gas into contact with an aqueous solution of an alkyl alcohol and nitric acid in a reactorwhich aqueous solution may be a liquid fraction generated in an alkyl nitrite-production process in which an alkyl alcohol is reacted with nitrogen monoxide and oxygen in a reaction column

A cyclododecanone compound is continuously produced by an isomerization reaction of a corresponding epoxycyclododecane compound in the presence of a catalyst including lithium bromide and/or lithium iodide, the isomerization reaction being carried out by passing a reaction mixture containing the epoxycyclododecane compound and the catalyst through a continuous reaction apparatus including at least one tubular reactor preferably at a temperature of 100 to 350&deg; C.

Method of continuously producing a cyclododecanone compound

A composition consisting essentially of a diaryl carbonate and contains a furan ring-containing compound in an amount of not more than 1 ppm is favorably employable for producing less colored polycarbonate.

Diaryl carbonate product and production of polycarbonate

A cyclododecanone compound is continuously produced by feeding a liquid feed containing a corresponding epoxycyclododecane compound and LiBr and/or LiI into a frontmost reaction region of a plurality of reaction regions connected to each other in series; successively passing the liquid feed through the series of reaction regions to catalytically isomerize the epoxycyclododecane compound into a corresponding cyclododecanone compound; and collecting the resultant reaction mixture containing the target cyclododecanone compound from a rearmost reaction region of the series of reaction regions.

Process for continuously producing a cyclododecanone compound

A cyclododecanone compound is produced in a high reaction rate, with a high conversion of the starting compound, and with a high selectivity to and a high yield of the target compound by isomerizing an epoxycyclododecane compound in the presence of a catalyst comprising lithium bromide and/or lithium iodide, without using a solvent or in a non-polar solvent, in an inert gas atmosphere, while substantially no polymeric compounds having a high boiling temperature is produced.

Method and producing cyclododecanone compound

An improved process for preparing an organic phosphonium chloride is performed by bringing an organic phosphonium bromide into contact with a chloride ion in a heterogeneous mixture solution of water and an organic solvent.

Preparation of organic phosphonium chloride

Process for producing aryl carbamates

A dialkyl carbonate (e.g., dimethyl carbonate) is prepared at a high yield and a high selectivity by decarbonylation of a dialkyl oxalate (e.g., dimethyl oxalate) in a gaseous phase in the presence of an alkali metal compound (e.g., potassium carbonate).

Process for preparing a dialkyl carbonate by gas-phase decarbonylation

A diaryl carbonate is produced by decarbonylating a diaryl oxalate, which can be prepared by transesterification of a dialkyl oxalate with a hydroxyaryl compound, in the presence of a catalyst, while removing the resultant carbon monoxide as a by-product, and then optionally refined by an evaporation and/or distillation, and then the resultant diaryl carbonate is condensation-polymerized with a polyhydroxyl compound, while recovering a resultant hydroxyaryl compound from the reaction system, to produce a polycarbonate.

Process for producing a polycarbonate

A catalyst composed of an organic phosphorus compound having a trivalent or pentavalent phosphorus atom and at least one carbon-phosphorus bonding or a combination of the organic phosphorus compound and a halogen atom-containing compound is effective for decarbonylation, that is, for releasing carbon monoxide from a compound containing a moiety of --CO--CO--O-- in its molecular structure.

Catalyst for decarbonylation reaction

A process for preparing a diaryl carbonate from a diaryl oxalate in a liquid phase by decarbonylation is conducted by the steps of:

Process for preparing diaryl carbonate

A high purity diaryl carbonate is produced with a high efficiency by reacting carbon monoxide with an alkyl nitrite and/or an alkyl alcohol; reacting the resultant dialkyl oxalate with a hydroxyaryl compound, for example, phenol; decarbonylating the resultant diaryl oxalate to produce a diaryl carbonate and carbon monoxide; and collecting the diaryl carbonate from the decarbonylation reaction product mixture, the carbon monoxide produced in the decabonylation step being optionally reused for the production of the dialkyl oxalate.

Process for producing diaryl carbonate

A diaryl carbonate with a high degree of purity is produced at a high yield by (A) subjecting (a) a diaryl oxalate and a phenol compound or (b) an alkylaryl oxalate to transesterification reaction in one or two stages in the presence of a catalyst to prepare a diaryl oxalate, while removing a by-product from the reaction system; (B) collecting the diaryl oxalate from the resultant reaction product mixture of the step (A); (C) subjecting the diaryl oxalate to a decarbonylation reaction, preferably in the presence of a phosphorous compound-containing catalyst, to convert the diaryl oxalate to a corresponding diaryl carbonate, while removing a reaction by-product comprising carbon monoxide from the reaction system; and (D) collecting the diaryl carbonate from the reaction product mixture of the step (C).

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Ube, Japan

Ryoji Sugise