会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 4. 发明授权
    • Process for esterifying phenol-containing carboxylic acids
    • 酯化含酚羧酸的方法
    • US4547583A
    • 1985-10-15
    • US657571
    • 1984-10-03
    • Hans J. Nestler
    • Hans J. Nestler
    • C07C69/712B01J27/00B01J27/02C07B61/00C07C67/08C07C69/732C07C69/88C07C69/76
    • C07C67/08
    • Carboxylic acids containing phenol groups are esterified by means of (C.sub.1 -C.sub.3)-alcohols in the presence of acid catalysts without the phenolic hydroxyl groups being esterified at the same time by continuously metering an excess of a water-containing (C.sub.1 -C.sub.3)-alcohol into a boiling hot solution or suspension of the phenol-containing carboxylic acid and of the catalyst in a non-water-miscible solvent (for example xylene) and at the same time distilling off a ternary solvent/alcohol/water mixture via a water separator, the metering rate being such that an aqueous bottom phase separates out in the receiving flask and the water content of the alcohol being so apportioned as not to breach the bottom limit of 0.1% or the upper limit of 1% (based on the contents of the reaction vessel) at any time in the course of the reaction. In this process, the esterification products are obtained free of major impurities and frequently can be used further without further purification.
    • 含有酚基的羧酸通过(C1-C3) - 醇在酸催化剂的存在下酯化,同时通过连续计量过量的含水(C1-C3) - 醇转化成沸腾的含酚羧酸和催化剂在非水混溶性溶剂(例如二甲苯)中的热溶液或悬浮液,同时通过水蒸馏出三元溶剂/醇/水混合物 分离器,计量率使得底部水相在容纳瓶中分离出来,并且酒精的含水量被分配为不破坏0.1%的下限或1%的上限(基于内容物 在反应过程中的任何时间。 在该方法中,获得的没有主要杂质的酯化产物经常可以进一步纯化而不用进一步使用。