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    • 8. 发明申请
    • Production of propylene glycol monoalkyl ether
    • 丙二醇单烷基醚的生产
    • US20090187049A1
    • 2009-07-23
    • US12009212
    • 2008-01-17
    • Xiangmin LiLawrence M. CandelaMark A. Liepa
    • Xiangmin LiLawrence M. CandelaMark A. Liepa
    • C07C43/10
    • C07C41/03C07C41/44C07C43/13
    • The invention is a process for producing a propylene glycol monoalkyl ether which comprises first reacting propylene oxide and an alcohol in the presence of an alkali or alkaline earth metal alkoxide catalyst to produce an alkoxylation mixture comprising propylene glycol monoalkyl ether; distilling the alkoxylation mixture to produce a first overhead stream comprising propylene oxide and alcohol and a first bottoms stream comprising propylene glycol monoalkyl ether; and then distilling the first bottoms stream to produce purified propylene glycol monoalkyl ether as a second overhead stream. The reaction and/or one or more of the distillation steps occur in the presence of an alkali metal borohydride. The process produces propylene glycol monoalkyl ether with low UV absorbance and reduced carbonyl impurities.
    • 本发明是一种生产丙二醇单烷基醚的方法,该方法包括首先在碱金属或碱土金属醇盐催化剂存在下使环氧丙烷与醇反应生成包含丙二醇单烷基醚的烷氧基化混合物; 蒸馏所述烷氧基化混合物以产生包含环氧丙烷和醇的第一塔顶物流和包含丙二醇单烷基醚的第一塔底物流; 然后蒸馏第一塔底物流以产生纯化的丙二醇单烷基醚作为第二塔顶馏出物。 反应和/或一个或多个蒸馏步骤在碱金属硼氢化物的存在下进行。 该方法生产具有低紫外吸收和降低的羰基杂质的丙二醇单烷基醚。