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    • 2. 发明授权
    • Process for the continuous preparation of dialkyl carbonates
    • 连续制备碳酸亚铁的方法
    • US5231212A
    • 1993-07-27
    • US936182
    • 1992-08-26
    • Hans-Josef BuyschAlexander KlausenerReinhard LangerFranz-Josef Mais
    • Hans-Josef BuyschAlexander KlausenerReinhard LangerFranz-Josef Mais
    • C07C68/06C07C69/96
    • C07C68/065
    • Dialkyl carbonates can be prepared in a continuous manner by transesterification of ethylene carbonate or propylene carbonate with alcohols in the presence of a catalyst in a column equipped with packing or baffles, by passing the reactants in countercurrent such that the ethylene carbonate or propylene carbonate are metered into the upper part of the column and the alcohol is metered into the lower part of the column and the catalyst is arranged as a fixed bed in the column or is also metered into the upper part of the column in solution or suspension, the dialkyl carbonate formed, if appropriate as a mixture with alcohol, being removed at the top of the column and the ethylene glycol or propylene glycol formed from the ethylene carbonate or propylene carbonate being removed at the foot of the column, if appropriate together with the catalyst.
    • 碳酸二烷基酯可以通过使碳酸亚乙酯或碳酸亚丙酯与醇在催化剂存在下在装备有填料或挡板的塔中进行酯交换,通过使反应物逆流使得将碳酸亚乙酯或碳酸亚丙酯计量 进入塔的上部,并将醇计量到塔的下部,并将催化剂作为固定床排列在塔中,或者也以溶液或悬浮液计量加入塔的上部,碳酸二烷基酯 如果合适地与醇的混合物形成,则在塔的顶部除去乙烯或碳酸亚丙酯形成的乙二醇或丙二醇,如果与催化剂一起适当,则将其从塔底除去。
    • 3. 发明授权
    • Process for the preparation of ethylene glycol carbonate
    • 制备乙二醇碳酸酯的方法
    • US5350862A
    • 1994-09-27
    • US984789
    • 1992-12-03
    • Paul WagnerHans-Josef BuyschAlexander KlausenerFranz-Josef MaisChristine Mendoza-Frohn
    • Paul WagnerHans-Josef BuyschAlexander KlausenerFranz-Josef MaisChristine Mendoza-Frohn
    • C07B61/00C07D317/38C07D317/36
    • C07D317/38
    • A process is described for the catalytic preparation of ethylene glycol carbonate by reaction of ethylene oxide and CO.sub.2 in ethylene glycol carbonate as the reaction medium at elevated temperature and at elevated pressure with work-up by distillation to separate the resulting ethylene glycol carbonate from the catalyst. The process is carried out continuously under adiabatic temperature conditions. Per unit of time, ethylene glycol carbonate as reaction medium runs into the reactor in a amount 10 to 120 times that of ethylene glycol carbonate formed per unit of time. A CO.sub.2 excess over the other reaction partner ethylene oxide is maintained at all sites of the reactor. 80 to 98% by weight of the reaction mixture flowing out is returned to the inlet of the reactor, while the remainder is worked up by distillation to give ethylene glycol carbonate. The sensible heat produced in the reaction product as a result of the adiabatic temperature conditions, is used for the work-up.
    • 描述了通过环氧乙烷和CO 2在乙二醇碳酸酯中作为反应介质在升高的温度和升高的压力下反应制备乙二醇碳酸酯的方法,通过蒸馏进行后处理以将所得的乙二醇碳酸酯与催化剂分离 。 该过程在绝热温度条件下连续进行。 每单位时间,作为反应介质的乙二醇碳酸酯以每单位时间形成的乙二醇碳酸酯的量的10至120倍的量进入反应器。 在反应器的所有位置保持超过其他反应对象环氧乙烷的二氧化碳剩余量。 将流出的反应混合物的80〜98重量%返回到反应器的入口,其余部分通过蒸馏处理得到乙二醇碳酸酯。 作为绝热温度条件的结果,在反应产物中产生的显热用于后处理。