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    • 2. 发明授权
    • Process for preventing polymerization of vinyl compound
    • 防止乙烯基化合物聚合的方法
    • US5886220A
    • 1999-03-23
    • US793600
    • 1997-03-05
    • Kenji OkamotoTakashi NakagawaHideaki MimakiKouji Tomita
    • Kenji OkamotoTakashi NakagawaHideaki MimakiKouji Tomita
    • C07B63/04C07C51/50C07C57/075C07C57/04C07C57/02
    • C07C51/50C07B63/04
    • There is disclosed a process for preventing the polymerization of a vinyl compound which comprises allowing water in an amount of 0.05 to 5% by weight based on the vinyl compound or a corrosion inhibitive substance selected from an alcohol, an inorganic acid or its salt, an aromatic carboxylic acid or its salt and a zinc-containing salt in an amount of preferably 0.01 to 5% by weight based on the same, to coexist with a metallic salt of dithiocarbamic acid, in preventing the polymerization of the vinyl compound with the metallic salt of dithiocarbamic acid. The above process makes it possible to effectively inhibit the polymerization of acrylic acid, methacrylic acid, etc. in the distillation system, etc. of the production process for the above acids as well as the corrosion of the equipment and machinery to be used therein and also to assure long-term stable continuous operation of the equipment and machinery.
    • PCT No.PCT / JP95 / 01705 Sec。 371日期1997年3月5日 102(e)1997年3月5日PCT PCT 1995年8月29日PCT公布。 出版物WO96 / 07631 日期:1996年3月14日公开了一种防止乙烯基化合物聚合的方法,该方法包括使乙烯基化合物或选自醇,无机酸的腐蚀抑制物质为0.05〜5重量% 或其盐,芳族羧酸或其盐和含锌盐的含量相对于二硫代氨基甲酸的金属盐优选为0.01-5重量%,以防止乙烯基聚合反应 与二硫代氨基甲酸的金属盐化合物。 上述方法使得有可能有​​效地抑制上述酸的制备方法的蒸馏系统中的丙烯酸,甲基丙烯酸等的聚合以及其中使用的设备和机器的腐蚀, 也保证设备和机械的长期稳定连续运行。