申请人:Saudi Basic Industries Corporation (SABIC)
公开号:US20030216587A1
公开(公告)日:2003-11-20
A process for the conversion of aldehydes to esters, specifically acrolein or methacrolein to methyl acrylate or methyl methacrylate, respectively. Essentially in the absence of water, an aldehyde is contacted with an oxidizing agent to form an intermediate and then the intermediate is contacted with a diol or an alcohol to form an ester or diester. Preferably, the oxidizing agent is also a chlorinating agent. Specifically, acrolein or methacrolein is contacted with an oxidizing/chlorinating agent, such as t-butyl hypochlorite, and the chlorinated compound is contacted with an alcohol, such as methanol, to form methyl acrylate or methyl methacrylate, respectively. Generally, the order of addition is for the oxidizing agent to be added to the aldehyde, specifically for t-butyl hypochlorite to be added to acrolein or methacrolein, and for the diol or alcohol to be added to the intermediate, specifically for the methanol to be added to the reaction product of acrolein or methacrolein and t-butyl hypochlorite. The process of the present invention can be carried out in the absence or in the presence of solvent. Generally, better methyl acrylate or methyl methacrylate yields are obtained at lower reaction temperatures.
将醛类化合物转化为酯类化合物的方法,具体是将丙烯醛或甲基丙烯醛分别转化为丙烯酸甲酯或甲基丙烯酸甲酯。基本上在无水的情况下,将醛类化合物与氧化剂接触以形成中间体,然后将中间体与二元醇或醇类化合物接触以形成酯类或二酯类化合物。最好,氧化剂也是氯化剂。具体地,将丙烯醛或甲基丙烯醛与氧化/氯化剂接触,例如叔丁基次氯酸酯,然后将氯化化合物与醇类接触,例如甲醇,分别形成丙烯酸甲酯或甲基丙烯酸甲酯。一般来说,添加顺序是将氧化剂加入到醛类化合物中,具体来说是将叔丁基次氯酸酯加入到丙烯醛或甲基丙烯醛中,然后将二元醇或醇类加入到中间体中,具体来说是将甲醇加入到丙烯醛或甲基丙烯醛与叔丁基次氯酸酯反应生成的产物中。本发明的方法可以在无溶剂或有溶剂的情况下进行。一般来说,在较低的反应温度下可以获得更好的丙烯酸甲酯或甲基丙烯酸甲酯产率。