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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。