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公开(公告)号:US3988213A
公开(公告)日:1976-10-26
申请号:US510917
申请日:1974-10-01
IPC分类号: B01D3/14 , B01D3/22 , C07C45/82 , C07C51/44 , C07C51/50 , C07C67/62 , C07D303/16 , B01D3/34 , C07C7/18
CPC分类号: C07C51/50 , B01D3/14 , B01D3/22 , B01D3/225 , C07C45/82 , C07C51/44 , C07C67/54 , C07C67/62 , C07D303/16 , Y10S203/22
摘要: A method of distilling a polymerizable vinyl compound selected from the group consisting of acrolein, methacrolein, acrylic acid, methacrylec acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, glycidyl acrylate and glycidyl methacrylate, the method comprising distilling the polymerizable vinyl compound in the presence of a polymerization inhibitor using a distillation tower having perforated trays without downcomers and wherein the temperature of the inner wall of the tower is maintained at a temperature sufficient to prevent the condensation of the vapor being distilled, whereby the polymerizable vinyl compound is distilled without the formation of polymer.
摘要翻译: 一种蒸馏聚合性乙烯基化合物的方法,其特征在于,选自丙烯醛,甲基丙烯醛,丙烯酸,甲基丙烯酸,丙烯酸羟乙酯,甲基丙烯酸羟乙酯,丙烯酸羟丙酯,甲基丙烯酸羟丙酯,丙烯酸缩水甘油酯和甲基丙烯酸缩水甘油酯,该方法包括将可聚合的乙烯基化合物 在使用具有不含降液管的多孔塔板的蒸馏塔的聚合抑制剂的存在下,并且塔的内壁的温度保持在足以防止蒸馏蒸气冷凝的温度,由此蒸馏可聚合的乙烯基化合物 不形成聚合物。
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公开(公告)号:US4098689A
公开(公告)日:1978-07-04
申请号:US729173
申请日:1976-10-04
摘要: On treating a waste water with activated sludge, an appropriate amount of sea water is added to the waste water.
摘要翻译: 在用活性污泥处理废水时,向废水中加入适量的海水。
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公开(公告)号:US4105546A
公开(公告)日:1978-08-08
申请号:US729174
申请日:1976-10-04
CPC分类号: C02F3/34
摘要: Waste waters, including those containing an oil, are treated with activated sludge and a hydrocarbon having from 4 to 20 carbon atoms per molecule or a hydrocarbon fraction containing the same.
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4.
公开(公告)号:US4021310A
公开(公告)日:1977-05-03
申请号:US569263
申请日:1975-04-18
申请人: Noboru Shimizu , Sadao Yoshida , Kunihiro Kubota , Takashi Ohara
发明人: Noboru Shimizu , Sadao Yoshida , Kunihiro Kubota , Takashi Ohara
摘要: A method for inhibiting the polymerization of acrylic acid or acrylic esters during the distillation for separating or purifying the acrylic acid obtained by the vapor phase catalytic oxidation of propylene or acrolein, or the acrylic esters derived from said acrylic acid, said method comprising carrying out the distillation operation in the presence of (A) at least one compound selected from the group consisting of hydroquinone, hydroquinonemonomethyl ether, cresols, phenols, t-butyl catechol, diphenylamine, phenothiazines and methylene blue (B) at least one compound selected from the group consisting of copper dimethyldithiocarbamate, copper diethyldithiocarbamate copper dibutyldithiocarbamate and copper salicylate: and (C) molecular oxygen.
摘要翻译: 在丙烯或丙烯醛的气相催化氧化得到的丙烯酸的分馏或精制蒸馏中抑制丙烯酸或丙烯酸酯的聚合的方法或由所述丙烯酸衍生的丙烯酸酯的方法,所述方法包括: 在(A)至少一种选自氢醌,氢醌甲氧基甲基醚,甲酚,酚,叔丁基儿茶酚,二苯胺,吩噻嗪和亚甲基蓝(B)的化合物的存在下进行蒸馏操作,所述化合物选自: 由二甲基二硫代氨基甲酸铜,二乙基二硫代氨基甲酸铜,二丁基二硫代氨基甲酸铜和水杨酸铜组成:和(C)分子氧。
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