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    • 2. 发明授权
    • Process for producing (meth) acrylic acid
    • (甲基)丙烯酸的制造方法
    • US5872288A
    • 1999-02-16
    • US990522
    • 1997-12-15
    • Hidefumi HaramakiOsamu DodoMamoru Takamura
    • Hidefumi HaramakiOsamu DodoMamoru Takamura
    • C07C57/07C07C51/42
    • C07C51/42Y10S203/22
    • The present invention provides a process for producing (meth)acrylic acid by gas-phase catalytic oxidation, which comprises cooling and condensing a (meth)acrylic acid-containing reaction product gas to obtain a crude aqueous (meth)acrylic acid solution; cooling the aqueous solution to deposit the impurities contained in the aqueous solution, as solid matter; separating the solid matter; and then extracting and separating (meth)acrylic acid from the purified aqueous (meth)acrylic acid solution obtained. Unlike the conventional processes in which (meth)acrylic acid is extracted and separated from a crude aqueous (meth)acrylic acid solution, the present process can avoid various troubles caused by the impurities contained in the crude aqueous (meth)acrylic acid solution, for example, generation of scum and the like, and therefore can produce (meth)acrylic acid at a higher purity than in the conventional processes.
    • 本发明提供一种通过气相催化氧化制备(甲基)丙烯酸的方法,其包括冷却并冷凝含(甲基)丙烯酸的反应产物气体,得到粗的(甲基)丙烯酸水溶液; 冷却水溶液以沉积包含在水溶液中的杂质,作为固体物质; 分离固体物质; 然后从得到的纯化的(甲基)丙烯酸水溶液中萃取分离(甲基)丙烯酸。 与从(甲基)丙烯酸粗水溶液中提取(甲基)丙烯酸并分离的常规方法不同,本方法可以避免由粗制的(甲基)丙烯酸水溶液中所含的杂质引起的各种麻烦, 例如,生成浮渣等,因此可以以比常规方法更高的纯度生产(甲基)丙烯酸。
    • 9. 发明授权
    • Method for catalytic gas phase oxidation
    • 催化气相氧化方法
    • US06613940B1
    • 2003-09-02
    • US09648950
    • 2000-08-25
    • Takeshi NishimuraMasakatsu MoriMasatsugu KitauraOsamu DodoDaisuke Nakamura
    • Takeshi NishimuraMasakatsu MoriMasatsugu KitauraOsamu DodoDaisuke Nakamura
    • C07C5116
    • B01J8/008B01J8/067B01J2208/00212B01J2208/00221B01J2208/00256C07C45/35C07C51/215C07C51/252C07C51/255C07C51/265C07C47/22C07C57/145C07C63/16C07C57/02
    • In the reaction of catalytic gas phase oxidation by means of a shell-and-tube type reactor adapted to circulate a heating medium to the shell of the reactor through the medium of a circulation device connecting an annular conduit connected thereto, a method for the catalytic gas phase oxidation characterized by subjecting a part of the heating medium extracted from the shell of the reactor to heat exchange, introducing the heating medium resulting from the heat exchange into the proximity of a heating medium circulation inlet on the inlet side of the circulation device or the annular conduit on the outlet side of the reactor. The flow rate of the heating medium after the heat exchange is preferred to be in the range of 2-40 vol. % based on the flow rate of the heating medium within the shell of the reactor and the temperature difference of the heating medium at the inlet and the outlet to be in the range of 15-150° C. According to this invention, it is made possible to reduce evenly the hot spots in the reaction tubes, improve the yield of the product aimed at, and implement a reaction of catalytic gas phase oxidation of propylene or isobutylene.
    • 在通过壳管式反应器进行催化气相氧化的反应中,该反应器适于通过连接连接其的环形导管的循环装置的介质将加热介质循环到反应器的壳体,催化剂的方法 气相氧化特征在于使从反应器壳体中提取的一部分加热介质进行热交换,将由热交换产生的加热介质引入循环装置入口侧的加热介质循环入口附近,或 反应器出口侧的环形导管。 热交换后的加热介质的流量优选为2-40体积%。 基于反应器壳体内的加热介质的流量,入口和出口处的加热介质的温度差在15-150℃的范围内。根据本发明,制成 可能均匀地减少反应管中的热点,提高目标产品的产率,并实现丙烯或异丁烯的催化气相氧化反应。