Asahi Kasei Chemicals Corporation

Asahi Kasei Kogyo Kabushiki Kaisha

Asahi Kasei Kabushiki Kaisha

The University of Tokyo

Dowa Electronics Materials Co., Ltd.

Hiroshi Hachiya

Shinsuke Fukuoka

Kazuhiko Matsuzaki

Hironori Miyaji

Kyosuke Komiya

Kazuhiro Shibuya

Akira Miyamoto

Nobutsugu Nanba

Kazuyuki Matsumoto

Shin-ichi Ohkoshi

Asuka Namai

Takashi Gotoh

Shunsuke Sakurai

Teruyoshi Shimoda

Sayaka Umeda

Nobutsugu Namba

Isaburo Fukawa

Haruyuki Yoneda

Kazuharu Yasuda

Wen-Yi Su

Muneaki Aminaka

Koshiro Yokota

Miyuki Kazunori

Tetsuo Hamada

Toshiharu Sakuma

Shinya Kawasoe

Ichiro Kakihara

Takashi Adachi

Chung Neng Wu

Kazuhiko; Matsuzaki

Yasuda Kazuharu

Aminaka Muneaki

An epsilon-type iron oxide having an Fe-site that is substituted with a platinum group element, provided that Fe of a D-site of the epsilon-type iron oxide is not substituted with the platinum group element.

Method for improving coercive force of epsilon-type iron oxide, and epsilon-type iron oxide

To provide a method for improving a coercive force of epsilon-type iron oxide particles, and an epsilon-type iron oxide. Specifically, to provide a method for improving the coercive force of an epsilon-type iron oxide comprising: substituting Fe-site of the epsilon-type iron oxide with other element, while not substituting Fe of D-site in the epsilon-type iron oxide with other element, and the epsilon type iron oxide.

A method for producing a condensation polymerization reaction polymer, comprising a guide polymerization step in which a molten prepolymer is supplied to the top edge of a wire guide to obtain the condensation polymerization reaction polymer, the wire guide comprising a vertical wire group consisting of a plurality of vertical wires extending in the vertical direction, which are mutually spaced in alignment at an arrangement pitch L1 (mm). In the guide polymerization step, the molten prepolymer aggregates so that a molten prepolymer mass is formed on the vertical wire, and a molten prepolymer mass is formed wherein, the width of the molten prepolymer mass measured in an alignment direction of the vertical wires at a position 200 mm below the top edge being represented as L(mm), the width Lof at least a portion of the molten prepolymer mass satisfies the inequality (1).L1&#x3c;L2&#x2003;&#x2003;(1)

Process for producing polycondensation polymer, and polymerizer

A branched polycarbonate having a branching derived from a polyfunctional compound, comprising a repeating unit represented by general formula (1), a branched structure (a) derived from the polyfunctional compound and a branched structure (b) including at least one selected from the group consisting of branched structures represented by general formulas (2), (3) and (4), the total content of (a) and (b) with respect to (1) being 0.2-1.0 mol %, the ratio of (b) with respect to the total of (a) and (b) being 0.1-0.6, and the ratio of (2) with respect to the content of (b) being 0.5 or greater. [In formulas, Ar represents a divalent aromatic residue and Ar' represents a trivalent aromatic residue.]

Branched polycarbonate

The invention provides an apparatus and process for producing a diol by taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into column A, carrying out reactive distillation in column A, continuously withdrawing a low boiling point reaction mixture containing a produced dialkyl carbonate and the aliphatic monohydric alcohol from an upper portion of column A, continuously withdrawing a high boiling point reaction mixture containing a produced diol from a lower portion of column A, continuously feeding the high boiling point reaction mixture into distillation column C, distilling off material having a lower boiling point than that of the diol contained in the high boiling point reaction mixture as a column top component and a side cut component so as to obtain a column bottom component, continuously feeding the column bottom component into column C, and obtaining the diol.

Industrial process for production of diol

The invention provides an apparatus and process for producing high-purity diol by taking cyclic carbonate and aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into column A, carrying out reactive distillation in column A, continuously withdrawing a low boiling point reaction mixture containing a produced dialkyl carbonate and the aliphatic monohydric alcohol from an upper portion of column A, continuously withdrawing a high boiling point reaction mixture containing a produced diol from a lower portion of column A, continuously feeding the high boiling point reaction mixture into distillation column C, distilling off material having a lower boiling point than that of the diol contained in the high boiling point reaction mixture Aas a column top component and/or a side cut component so as to obtain a column bottom component, continuously feeding the column bottom component into distillation column E, and obtaining the diol.

Industrial process for production of high-purity diol

A process for industrially producing dialkyl carbonate and a diol continuously through a reactive distillation system is disclosed. The process includes the steps of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present, carrying out reaction and distillation simultaneously in the column, continuously withdrawing a low boiling point reaction mixture containing the produced dialkyl carbonate from an upper portion of the column in a gaseous form, and continuously withdrawing a high boiling point reaction mixture containing the diol from a lower portion of the column in a liquid form. According to the present invention, there is provided a specific continuous multi-stage distillation column having a specified structure, and a production process using this continuous multi-stage distillation column.

Process for industrially producing dialkyl carbonate and diol

It is an object of the present invention to provide a specific apparatus and process for using a single distillation column on a low boiling point reaction mixture containing a large amount of a dialkyl carbonate and an aliphatic monohydric alcohol produced through a reactive distillation process of taking a cyclic carbonate and the aliphatic monohydric alcohol as starting materials, continuously feeding the starting materials into a continuous multi-stage distillation column in which a homogeneous catalyst is present, and carrying out reaction and distillation simultaneously in the column, so as to separate the low boiling point reaction mixture by distillation into a column top component Bhaving the aliphatic monohydric alcohol as a main component thereof and a column bottom component Bhaving the dialkyl carbonate as a main component thereof stably for a prolonged period of time industrially.

Industrial process for separating out dialkyl carbonate

A high-purity diphenyl carbonate, wherein the diphenyl carbonate is unsubstituted or substituted with a lower hydrocarbon, and has a halogen content of not more than 0.1 ppm, a content of an intermediate boiling point material of not more than 100 ppm, and a content of by-products having a higher boiling point than that of said diphenyl carbonate of not more than 100 ppm. A specific industrially useful process for the production of a high-purity diaryl carbonate in which a diaryl carbonate having low contents of intermediate boiling point and high boiling point impurities is produced is disclosed. As a starting material, a reaction mixture containing an alkyl aryl carbonate obtained through a transesterification reaction between a dialkyl carbonate and an aromatic monohydroxy compound is used. The process in which separation by distillation is carried out uses three distillation columns in a specified order.

Process for production of high-purity diaryl carbonate

An aromatic polycarbonate that is obtained by transesterification between a high-purity diphenyl carbonate and an aromatic dihydroxy compound. A specific industrially useful process for the production of a high-purity diaryl carbonate in which a diaryl carbonate having low contents of intermediate boiling point and high boiling point impurities is produced is disclosed. As a starting material, a reaction mixture containing an alkyl aryl carbonate obtained through a transesterification reaction between a dialkyl carbonate and an aromatic monohydroxy compound is used. The process in which separation by distillation is carried out uses three distillation columns in a specified order. Moreover, it is particularly preferable if a reactive distillation column and the three distillation columns, each of which has a specified structure, and the three distillation columns are each operated under specified distillation conditions.

It is an object of the present invention to provide a specific industrial separation process that enables an alcohol to be separated out efficiently and stably for a prolonged period of time from a large amount of a low boiling point reaction mixture containing a by-produced alcohol when mass-producing aromatic carbonates on an industrial scale by subjecting a dialkyl carbonate and an aromatic monohydroxy compound to transesterification reaction in a reactive distillation column in which a catalyst is present. Although there have been various proposals regarding processes for the production of aromatic carbonates by means of a reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale to be carried out stably for a prolonged period of time. Moreover, there have been no disclosures on a specific process or apparatus enabling the alcohol by-produced when producing aromatic carbonates the an industrial scale using a reactive distillation system to be separated out efficiently and stably for a prolonged period of time on an industrial scale of not less than 200 kg/hr. According to the present invention, there is proposed a specific process using a continuous multi-stage distillation column having a specified structure enabling the above object to be attained.

Industrial process for separating out by-produced alcohols

According to the present invention, there are provided a high boiling point material separating column A and a diphenyl carbonate purifying column B each comprising a continuous multi-stage distillation column having specified structures, and there is provided a specific process that enables a high-purity diphenyl carbonate which is important as a raw material of a high-quality and high-performance polycarbonate to be produced stably for a prolonged period of time on an industrial scale of not less than 1 ton/hr from a reaction mixture containing the diphenyl carbonate using an apparatus in which these two continuous multi-stage distillation columns are connected together.

Industrial process for production of high-purity diphenyl carbonate

It is an object of the present invention to provide, for a case of producing a dialkyl carbonate and a diol from a cyclic carbonate and an aliphatic monohydric alcohol, a process that simultaneously satisfies the cyclic carbonate conversion being high, the selectivities for the dialkyl carbonate and diol to be produced being high, and a high-purity diol having a high UV transmittance and a low aldehyde content being obtained without carrying out complicated treatment such as feeding water into a diol distillation purification step. The present invention discloses a process for the production of the dialkyl carbonate and the diol in which, when producing the dialkyl carbonate and the diol by reacting the cyclic carbonate and the aliphatic monohydric alcohol together in the presence of a catalyst in a transesterification reactor comprising a tray type continuous multi-stage distillation column, reaction conditions (residence times, temperatures) in the distillation column are controlled to be specific conditions.

Process for production of dialkyl carbonate and diol

It is an object of the present invention to provide, for the case of continuously producing aromatic carbonates containing a diaryl carbonate as a main product by taking an alkyl aryl carbonate as a starting material, which is obtainable through a transesterification reaction between a dialkyl carbonate and an aromatic monohydroxy compound, using a continuous multi-stage distillation column in which a catalyst is present, and continuously feeding the starting material into the continuous multi-stage distillation column, a specific process that enables the diaryl carbonate to be produced with high selectivity and high productivity stably for a prolonged period of time on an industrial scale of not less than 1 ton per hour. Although there have been various proposals regarding processes for the production of aromatic carbonates by means of a reactive distillation method, these have all been on a small scale and short operating time laboratory level, and there have been no disclosures whatsoever on a specific process or apparatus enabling mass production on an industrial scale. According to the present invention, there is provided a specified continuous multi-stage distillation column, and there is also provided a specific process that enables a diaryl carbonate to be produced with high selectivity and high productivity stably for a prolonged period of time on an industrial scale of not less than 1 ton per hour from an alkyl aryl carbonate.

Industrial process for production of an aromatic carbonate

An industrial evaporation apparatus having a specified structure in which there are guides that do not themselves have a heat source, a flow path controlling member having a function of making the liquid fed onto a perforated plate from a liquid receiving port flow mainly from a peripheral portion toward a central portion of the perforated plate is provided in a liquid feeding zone, and formula (1) to (5), or formula (1) to (10), or formula (1) to (12), are satisfied.

Growing community of inventors

Tokyo, Japan

Hiroshi Hachiya