申请人:IDEMITSU PETROCHEMICAL CO., LTD.
公开号:EP0781755A1
公开(公告)日:1997-07-02
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.
本发明公开了一种防止乙烯基化合物聚合的工艺,该工艺包括允许按乙烯基化合物重量计 0.05%至 5%的量的水或选自醇、无机酸或其盐、芳香族羧酸或其盐以及按重量计优选 0.01%至 5%的量的含锌盐中的缓蚀物质与二硫代氨基甲酸的金属盐共存,以防止乙烯基化合物与二硫代氨基甲酸的金属盐聚合。通过上述工艺,可以有效抑制丙烯酸、甲基丙烯酸等在上述酸类生产工艺的蒸馏系统等中的聚合,以及对其中使用的设备和机械的腐蚀,并确保设备和机械的长期稳定连续运行。