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公开(公告)号：EP0855384A4
公开(公告)日：1999-06-23
申请号：EP96931286
申请日：1996-09-20
申请人： ASAHI CHEMICAL IND
发明人： KOMIYA KYOSUKE , TOJO MASAHIRO , FUKUOKA SHINSUKE
摘要： A process for the preparation of an aromatic carbonate by subjecting a starting compound selected from the group consisting of dialkyl carbonates, alkyl aryl carbonates and mixtures thereof and a reactant selected from the group consisting of aromatic mono-hydroxyl compounds, alkyl aryl carbonates and mixtures thereof to transesterification in the presence of a metal-containing catalyst, characterized in that the transesterification is conducted while keeping the weight ratio (WR) of at least one substance having an aromatic group selected from the group consisting of specific aromatic polyhydroxyl compounds resulting from the starting compound, the reactant and/or by-products of the transesterification and residues of them to the metal constituting the catalyst-containing liquid mixture of the transesterification system. According to this process, undesirable phenomena such as the deposition of the catalyst in reactors or pipes and the adhesion of the catalyst to them can be inhibited to thereby permit a stable preparation of an aromatic carbonate for a long period.
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公开(公告)号：EP0753519A4
公开(公告)日：1997-05-07
申请号：EP96901500
申请日：1996-01-31
申请人： ASAHI CHEMICAL IND
发明人： KODAMA TAMOTSU , TOJO MASAHIRO , IKEDA MASANORI
IPC分类号： C07D487/18 , C07D487/22
CPC分类号： C07D487/18 , C07D487/22
摘要： Acylated hexaazaisowurtzitane derivatives represented by the general formula (1): WAnH(6-n), wherein n represents an integer of 4 to 6; A represents C1-C10 acyl; H represents hydrogen; and W represents a hexavalent hexaazaisowurtzitane residue represented by formula (2). The derivatives are useful as precurcors for polynitrohexaazaisowurtzitane derivatives useful as an additive for gunpowder materials and gunpowder products, raw materials for highly polar polymers, high-density cross-linking agents, and polymer additives.
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公开(公告)号：EP1086940A4
公开(公告)日：2004-04-07
申请号：EP99923989
申请日：1999-06-10
申请人： ASAHI CHEMICAL IND
发明人： TOJO MASAHIRO , OONISHI KAZUHIRO
IPC分类号： C07C27/02 , C07C29/128 , C07C68/06 , C07C31/20 , C07C69/96
CPC分类号： C07C29/1285 , C07C68/065 , Y02P20/52 , C07C69/96 , C07C31/202 , C07C31/20
摘要： A process comprising feeding continuously a cyclic carbonate and an aliphatic monohydric alcohol to a continuous multi-stage distillation column and forming (A) a dialkyl carbonate and (B) a diol, wherein a gaseous low boiling point mixture containing (A) is continuously withdrawn from the upper portion of the distillation column, while continuously withdrawing a liquid high boiling point mixture containing (B) from the lower portion of the distillation column, and a transesterification is carried out under a condition satisfying the following requirements (a) to (c): (a) 5 x 104 Pa or less in terms of the bottom pressure of the continuous multi-stage distillation column, (b) -20 °C to a temperature lower than 60 °C in terms of the bottom temperature of the continuous multi-stage distillation column, (c) 0.2 to 5.0 in terms of F-factor of the continuous multi-stage distillation column represented by the following formula (1): F-factor = u¿g? (ςg)?1/2¿ wherein u¿g? represents a gas flow rate in the continuous multi-stage distillation column (m/s), and ςg represents a gas density in the continuous multi-stage distillation column (kg/m?3¿).
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公开(公告)号：EP1016648A4
公开(公告)日：2000-12-06
申请号：EP98942998
申请日：1998-09-16
申请人： ASAHI CHEMICAL IND
发明人： TOJO MASAHIRO , OONISHI KAZUHIRO , KOMIYA KYOSUKE
摘要： A process for the preparation of aromatic carbonates by transesterification of a starting substance selected from the group consisting of dialkyl carbonates, alkyl aryl carbonates and mixtures of both with a reactant selected from the group consisting of aromatic monohydroxyl compounds, alkyl aryl carbonates and mixtures of both in the presence of a metal catalyst, which comprises reacting part of the high-boiling reaction mixture of the transesterification containing the objective aromatic carbonate and the catalyst or part of the residue remaining after the recovery of the objective aromatic carbonate from the reaction mixture, which contains a high-boiling substance (A) having a higher boiling point than that of the objective aromatic carbonate and the catalyst (B), with a reactant (C) reactive with at least either of the substance (A) and the catalyst (B), and discharging the product of reaction of (A) with (C) from the production system of the aromatic carbonate with the product of reaction of (B) with (C) recycled into the reaction system. This process permits stable preparation of high-purity aromatic carbonates for a prolonged period.
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5.发明公开
公开(公告)号：EP0889025A4
公开(公告)日：1999-03-17
申请号：EP96942612
申请日：1996-12-20
申请人： ASAHI CHEMICAL IND
发明人： TOJO MASAHIRO , FUKUOKA SHINSUKE , KAWAMURA MAMORU
CPC分类号： C07C29/128 , C07C68/065 , C07C69/96 , C07C31/202
摘要： A process for continuously preparing dialkyl carbonates and diols, comprising the steps of: feeding a cyclic carbonate and an aliphatic monohydric alcohol into a continuous multistage distillation column; conducting transesterification in the presence of a catalyst in either one or both the distillation column or a transesterification reactor which has been connected liquid-tight to the distillation column so as to continuously receive the liquid in the distillation column from the column and to return the liquid to the column after the reaction, and withdrawing a gaseous low-boiling mixture containing dialkyl carbonates from the top of the distillation column while withdrawing a liquid high-boiling mixture from the bottom of the column; and continuously hydrolyzing an unreacted cyclic carbonate in the latter mixture into diols and carbon dioxide. This process enables dialkyl carbonates and high-purity diols to be prepared with a high productivity even when aliphatic monohydric alcohols containing dialkyl carbonates is used as the starting material.
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