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    • 7. 发明授权
    • Dimethylformamide synthesis via reactive distillation of methyl formate and dimethylamine
    • 通过甲酸甲酯和二甲胺的反应蒸馏二甲基甲酰胺合成
    • US06723877B1
    • 2004-04-20
    • US10462916
    • 2003-06-16
    • Robin Joyce MaliszewskyjMichael Gerard TurcotteJohn William Mitchell
    • Robin Joyce MaliszewskyjMichael Gerard TurcotteJohn William Mitchell
    • C07C23300
    • C07C231/02C07C67/40Y02P20/127C07C69/07C07C233/03
    • A continuous process for the production of dimethylformamide comprising the steps: (a) reacting methyl formate and dimethylamine in a reactive distillation column under conditions to form dimethylformamide and by-product methanol; (b) vaporizing the by-product methanol and generating a liquid dimethylformamide while in said reactive distillation column; (c) removing at least a major portion of the by-product methanol as an overhead from said reactive distillation column; (d) removing a crude liquid dimethylformamide containing residual by-product methanol as a bottoms fraction from said reactive distillation column; (e) introducing said bottoms fraction containing dimethylformamide and residual by-product methanol to a purification column wherein the by-product methanol is removed from said dimethylformamide as an overhead and purified dimethylformamide is removed as a bottoms fraction; and, optionally, (f) recycling the by-product methanol removed as an overhead from the purification column to the reactive distillation column.
    • 一种用于生产二甲基甲酰胺的连续方法,包括以下步骤:(a)在反应性蒸馏塔中使甲酸甲酯和二甲基胺在形成二甲基甲酰胺和副产物甲醇的条件下反应;(b)蒸发副产物甲醇并产生液体二甲基甲酰胺 同时在所述反应蒸馏塔中;(c)从所述反应蒸馏塔中除去至少大部分副产物甲醇作为塔顶馏出物;(d)除去作为底部馏分的残留副产物甲醇的粗液体二甲基甲酰胺, 所述反应性蒸馏塔;(e)将含有二甲基甲酰胺和残余副产物甲醇的塔底馏分引入纯化塔,其中副产物甲醇作为塔顶馏出物从所述二甲基甲酰胺中除去,纯化的二甲基甲酰胺作为塔底馏分除去; 和(f)将从塔顶馏去的副产物甲醇从净化塔循环到反应蒸馏塔。