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    • 4. 发明授权
    • Continuous production of aromatic carbonates
    • 连续生产芳香族碳酸酯
    • US5380908A
    • 1995-01-10
    • US131679
    • 1993-10-05
    • Kiyokazu MurataKozo KawahashiMamoru Watabiki
    • Kiyokazu MurataKozo KawahashiMamoru Watabiki
    • C07C68/06C07C69/96
    • C07C68/06
    • A process for continuously producing aromatic carbonates comprising continuously feeding a dialkyl carbonate, an aromatic hydroxy compound, and a catalyst to a reactor equipped with a distillation tower, continuously distilling off a by-produced aliphatic alcohol from the distillation tower so as to keep the aliphatic alcohol concentration in the reactor at 2% by weight or less, and continuously withdrawing produced alkylaryl carbonate and/or diaryl carbonate and the catalyst from the reactor; and a process for continuously producing a diaryl carbonate comprising continuously feeding an alkylaryl carbonate and a catalyst to a reactor equipped with a distillation tower, continuously distilling off a by-produced dialkyl carbonate from the distillation tower so as to keep the dialkylcarbonate concentration in the reactor at 2% by weight or less, and continuously withdrawing the produced diaryl carbonate and the catalyst from the reactor are disclosed. Continuous production of aromatic carbonates can be performed in a stable manner without being accompanied by clogging of a distillation tower.
    • 一种连续生产芳族碳酸酯的方法,包括将碳酸二烷基酯,芳族羟基化合物和催化剂连续供入到装有蒸馏塔的反应器中,从蒸馏塔中连续蒸馏出副产的脂族醇,以保持脂肪族 反应器中的醇浓度为2重量%以下,从反应器中连续抽出碳酸烷基芳基酯和/或碳酸二芳基酯和催化剂; 以及连续生产碳酸二芳基酯的方法,包括将碳酸烷基芳基酯和催化剂连续加入到装有蒸馏塔的反应器中,从蒸馏塔连续蒸馏出副产的碳酸二烷基酯,以保持反应器中的碳酸二烷基酯浓度 在2重量%以下,并且从反应器中连续取出所生产的碳酸二芳基酯和催化剂。 芳族碳酸酯的连续生产可以稳定地进行,而不伴随着蒸馏塔的堵塞。
    • 7. 发明授权
    • Process for preparation of isocyanate compounds
    • 异氰酸酯化合物的制备方法
    • US5773643A
    • 1998-06-30
    • US358680
    • 1994-12-19
    • Toyokazu YagiiTeruo ItokazuKiyokazu Murata
    • Toyokazu YagiiTeruo ItokazuKiyokazu Murata
    • C07C68/00C07C263/04C07C265/10C07C263/00
    • C07C263/04C07C68/005C07C2101/12
    • A diisocyanate compound substantially free from chlorine is prepared by the following consecutive steps (1), (2) and (3): (1) preparing dimethyl carbonate by a method selected from: (a) a method wherein carbon monoxide and oxygen are reacted with methanol, (b) a method wherein propylene oxide is reacted with carbon dioxide to prepare propylene carbonate, and then, the propylene carbonate is reacted with methanol, and (c) a method wherein a nitrous acid ester is catalytically reacted with carbon monoxide; (2) reacting the dimethyl carbonate with an aliphatic diamine in the presence of an alkali catalyst to prepare a corresponding urethane compound; and (3) thermally decomposing the urethane compound under a reduced pressure of 1 to 700 Torr in a high-boiling point solvent.
    • 通过以下连续步骤(1),(2)和(3)制备基本上不含氯的二异氰酸酯化合物:(1)通过选自以下的方法制备碳酸二甲酯:(a)一氧化碳和氧气反应的方法 (b)使环氧丙烷与二氧化碳反应制备碳酸丙烯酯的方法,然后使碳酸亚丙酯与甲醇反应,和(c)亚硝酸酯与一氧化碳催化反应的方法; (2)在碱催化剂存在下使碳酸二甲酯与脂肪族二胺反应,制备相应的氨基甲酸酯化合物; 和(3)在高沸点溶剂中在1〜700托的减压下热分解氨基甲酸酯化合物。