Process for making 2,3-dihalopropanols
    9.
    发明授权
    Process for making 2,3-dihalopropanols 失效
    制备2,3-二卤代丙醇的方法

    公开(公告)号:US6008419A

    公开(公告)日:1999-12-28

    申请号:US994208

    申请日:1997-12-19

    摘要: A 2,3-dihalopropanol is made by reacting 2,3-dihalopropanal with molecular hydrogen in the presence of a transition metal-containing catalyst, under conditions such that 2,3-dihalopropanol is formed. The reaction is particularly useful, for example, as Step (3) in a process to make epihalohydrin which may be generally prepared by:(1) reacting a 3-carbon hydrocarbon with an oxidizing agent to form acrolein;(2) reacting acrolein with a molecular halogen to form 2,3-dihalopropanal;(3) reducing 2,3-dihalopropanal with molecular hydrogen to form 2,3-dihalopropanol; and(4) cyclizing 2,3-dihalopropanol to make epihalohydrin.The process produces epihalohydrin using only about one mole of halogen per mole of epihalohydrin. It also uses substantially less water than existing processes.

    摘要翻译: 在含过渡金属的催化剂的存在下,在形成2,3-二卤代丙醇的条件下,通过2,3-二卤代丙醛与分子氢反应制备2,3-二卤丙醇。 该反应特别有用,例如作为制备表卤代醇的方法中的步骤(3),其通常可通过以下制备:(1)使3-碳烃与氧化剂反应形成丙烯醛; (2)使丙烯醛与分子卤素反应形成2,3-二卤代丙醛; (3)用分子氢还原2,3-二卤代丙醛,形成2,3-二卤代丙醇; 和(4)环化2,3-二卤丙醇以制备表卤代醇。 该方法使用每摩尔表卤代醇仅使用约1摩尔卤素产生表卤代醇。 它还使用比现有工艺少得多的水。