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    • 6. 发明授权
    • Method for absorbing acrylic acid and method for purifying acrylic acid
    • 丙烯酸的吸收方法和丙烯酸的净化方法
    • US06713648B2
    • 2004-03-30
    • US09780787
    • 2001-02-09
    • Harunori HiraoYoshitake IshiiYukihiro MatsumotoTakeshi Nishimura
    • Harunori HiraoYoshitake IshiiYukihiro MatsumotoTakeshi Nishimura
    • C07C5142
    • C07C51/44B01D3/225C07C51/48C07C57/04
    • This invention concerns a method for absorbing acrylic acid, characterized by supplying an acrylic acid-containing reaction gas component obtained by the reaction of catalytic gas phase oxidation to an acrylic acid absorption column and advancing a high boiling inert hydrophobic organic liquid into counter-flow contact with said reaction gas in said acrylic acid absorption column with the mass flow rate of the organic liquid fixed in the range of 0.2-4.5 times the mass flow rate of the acrylic acid in the reaction gas thereby absorbing acrylic acid in said organic liquid and obtaining an acrylic acid-containing solution and a method for purifying acrylic acid, comprising a step for purifying the acrylic acid-containing organic liquid obtained by the step mentioned above. By this invention, a product of acrylic acid containing a low boiling substance at a low concentration can be produced.
    • 本发明涉及一种吸收丙烯酸的方法,其特征在于将通过催化气相氧化反应获得的含丙烯酸的反应气体组分供给丙烯酸吸收塔,并将高沸点惰性疏水性有机液体推入逆流接触 所述丙烯酸吸收塔中的所述反应气体的有机液体的质量流量固定在反应气体中丙烯酸的质量流量的0.2-4.5倍的范围内,从而吸收所述有机液体中的丙烯酸,并获得 含丙烯酸的溶液和丙烯酸的精制方法,其特征在于,含有通过上述工序得到的含丙烯酸的有机液的纯化工序。 通过本发明,可以制备含有低浓度低沸点物质的丙烯酸的产物。
    • 8. 发明授权
    • Method for preventing effluent gas pipe from blocking
    • 防止排气管阻塞的方法
    • US06566551B2
    • 2003-05-20
    • US09724468
    • 2000-11-29
    • Takeshi NishimuraYukihiro MatsumotoSei NakaharaMisao InadaHarunori HiraoMamoru Takamura
    • Takeshi NishimuraYukihiro MatsumotoSei NakaharaMisao InadaHarunori HiraoMamoru Takamura
    • C07C5116
    • C07C51/252C07C57/04
    • For use in a process for the production of (meth)acrylic acid comprising at least a step for the reaction of (meth)acrylic acid by catalytic gas phase oxidation and a step for the absorption thereof, a method for preventing an effluent gas pipe from blocking is disclosed, which method is characterized by causing part or the whole of the gas discharged from the step for absorption, while being circulated via the effluent gas pipe to the step for the reaction or being discarded, to be subjected to temperature elevation and application of pressure and/or mist separation. Particularly by setting the temperature of the waste gas from the absorption column at a level in the range of 30-70° C., it is made possible to decrease the contents of water, low boiling substances, and subliming substances entrained by the waste gas and, coupled with the temperature elevation and the application of pressure implemented in the effluent gas pipe, attain effective prevention of the interior of the effluent gas pipe from blockage and corrosion.
    • 为了用于生产(甲基)丙烯酸的方法,至少包括通过催化气相氧化反应(甲基)丙烯酸的步骤和用于吸收的步骤,用于防止流出气体管道的方法 公开了这种方法,其特征在于,使得从步骤吸收的气体的一部分或全部通过废气管循环到用于反应或被丢弃的步骤中,以进行升温和施加 的压力和/或雾分离。 特别是通过将来自吸收塔的废气的温度设定在30〜70℃的范围内,能够降低水,低沸点物质和由废气夹带的升华物质的含量 再加上在排气管道中实施的温度升高和施加压力,有效防止排气管内部堵塞和腐蚀。