公开(公告)号：US4987252A

公开(公告)日：1991-01-22

申请号：US211903

申请日：1988-06-27

申请人： Morimasa Kuragano ,  Kozo Iwasaki ,  Takeshi Isobe ,  Isao Fukada ,  Minoru Koshibe ,  Yoshihiro Sezaki ,  Hirozo Segawa ,  Katsuji Yoguchi

发明人： Morimasa Kuragano ,  Kozo Iwasaki ,  Takeshi Isobe ,  Isao Fukada ,  Minoru Koshibe ,  Yoshihiro Sezaki ,  Hirozo Segawa ,  Katsuji Yoguchi

IPC分类号： C07C45/78 ,  C07C51/42 ,  C07C57/055 ,  C07C57/07

CPC分类号： C07C45/783 ,  C07C51/42

摘要： In order to recover methacrolein and/or methacrylic acid by quenching a reaction product gas obtained by catalytic oxidation of isobutylene or the like, the reaction product gas is charged into a quench column through a double-wall pipe and is then brought into contact with a condensate as a cooling medium. Deposition of terephthalic acid and the like inside the column is prevented by controlling the temperature of a bottom in the quench column and that of an overhead gas of a quench column unit. An aromatic carboxylic acid, aromatic aldehyde, metal powder is added to an aqueous solution of methacrylic acid, which contains terephthalic acid and the like, so that the terephthalic acid and the like are caused to precipitate for their removal.

公开(公告)号：US5028735A

公开(公告)日：1991-07-02

申请号：US501716

申请日：1990-03-30

申请人： Hirozo Segawa ,  Norio Ishikawa ,  Katsuji Yoguchi ,  Morimasa Kuragano ,  Minoru Koshibe

发明人： Hirozo Segawa ,  Norio Ishikawa ,  Katsuji Yoguchi ,  Morimasa Kuragano ,  Minoru Koshibe

IPC分类号： C07C67/54 ,  C07C69/54

CPC分类号： C07C29/88 ,  C07C67/54 ,  Y10S203/22

摘要： A purification process for methyl methacrylate (MMA) and a recovery process for methanol are disclosed. A mixture, which contains water, methanol and methyl methacrylate (MMA) as principal components along with at least one of methyl acrylate, methyl propionate and methacrylic acid, is azeotropically distilled together with hexane to obtain MMA in a form substantially free of water, methanol methyl acrylate, methyl propionate and hexane and a low boiling-point fraction. The low boiling-point fraction is cooled and separated into a water phase and an oil phase. Methanol can be recovered from the water phase by adding an alkaline substance to it and then distilling the resultant mixture. A preparation process of MMA is also disclosed. MMA can be prepared by esterifying methacrylic acid or methacrylamide with methanol and then applying the above purification process.

公开(公告)号：US4968846A

公开(公告)日：1990-11-06

申请号：US217849

申请日：1988-07-12

申请人： Morimasa Kuragano ,  Kozo Iwasaki ,  Yoshio Koyama ,  Takeshi Isobe ,  Hirozo Segawa ,  Katsuji Yoguchi

发明人： Morimasa Kuragano ,  Kozo Iwasaki ,  Yoshio Koyama ,  Takeshi Isobe ,  Hirozo Segawa ,  Katsuji Yoguchi

IPC分类号： C07C47/22 ,  B01J8/06 ,  C07C45/00 ,  C07C45/35 ,  C07C45/37 ,  C07C45/38 ,  C07C45/78 ,  C07C45/86 ,  C07C67/00

CPC分类号： C07C45/38 ,  B01J8/067 ,  C07C45/35 ,  C07C45/37 ,  C07C45/86 ,  B01J2208/00212

摘要： This invention provides a method for the prevention of oxidation of resulting methacrolein immediately after its discharge from a reaction tube upon production of the methacrolein by vapor-phase oxidation of isobutylene, tertiary butanol or methallyl alcohol with a molecular-oxygen-containing gas in the presence of a catalyst. An inert gas and/or recirculated reaction gas or a mixed gas of an inert gas and/or recirculated reaction gas and air is fed and mixed with a reaction product gas immediately after an outlet of the reaction tube.

公开(公告)号：US5196578A

公开(公告)日：1993-03-23

申请号：US758362

申请日：1991-09-10

申请人： Morimasa Kuragano ,  Takeshi Isobe ,  Nobutaka Ueda ,  Minoru Koshibe ,  Yoshihiro Sezaki ,  Hirozo Segawa ,  Katsuji Yoguchi ,  Rensuke Ikarashi

发明人： Morimasa Kuragano ,  Takeshi Isobe ,  Nobutaka Ueda ,  Minoru Koshibe ,  Yoshihiro Sezaki ,  Hirozo Segawa ,  Katsuji Yoguchi ,  Rensuke Ikarashi

IPC分类号： C07C51/44 ,  C07C51/487

CPC分类号： C07C51/44 ,  C07C51/487

摘要： A process is provided for the purification of methacrylic acid. The process can easily remove dibasic acids and aldehydes containing in trace amounts as impurities. According to the process, crude methacrylic acid obtained as an aqueous solution by vapor-phase catalytic oxidation of isobutylene, tertiary butanol, methacrolein or isobutyl aldehyde is treated with at least one compound selected from the group consisting of m-aminophenol, m-phenylenediamine, 2,4-diaminotoluene and 2,4-diamino-diphenylamine, followed by distillation, optionally, in the presence of a p-phenylene diamine.

摘要翻译： 提供了用于纯化甲基丙烯酸的方法。 该方法可以容易地除去含有微量杂质的二元酸和醛。 根据该方法，通过气相催化氧化异丁烯，叔丁醇，异丁烯醛或异丁醛作为水溶液得到的粗甲基丙烯酸用至少一种选自间氨基苯酚，间苯二胺， 2,4-二氨基甲苯和2,4-二氨基 - 二苯胺，然后任选在对苯二胺存在下进行蒸馏。

公开(公告)号：US4879412A

公开(公告)日：1989-11-07

申请号：US835737

申请日：1986-03-03

申请人： Kozo Iwasaki ,  Morimasa Kuragano ,  Minoru Koshibe ,  Yoshihiro Sezaki ,  Katsuji Yoguchi ,  Yoshio Koyama

发明人： Kozo Iwasaki ,  Morimasa Kuragano ,  Minoru Koshibe ,  Yoshihiro Sezaki ,  Katsuji Yoguchi ,  Yoshio Koyama

IPC分类号： C07C57/04 ,  C07C51/47 ,  C07C57/07

CPC分类号： C07C51/47 ,  Y10S203/22

摘要： Disclosed herein is a process for bringing methacrylic acid, which has been obtained by the catalytic oxidation of compound having 4 carbon atoms, into contact with a basic anion-exchange resin so as to remove byproduced dibasic acids and the like from the methacrylic acid and to purify the same.

摘要翻译： 本文公开了将通过催化氧化具有4个碳原子的化合物获得的甲基丙烯酸与碱性阴离子交换树脂接触以从甲基丙烯酸除去副产二酸等的方法，以及 净化一样。