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    • 42. 发明申请
    • Method for producing (METH) acrylic acid
    • (METH)丙烯酸的制备方法
    • US20080071111A1
    • 2008-03-20
    • US11902162
    • 2007-09-19
    • Satoshi Nakagawa
    • Satoshi Nakagawa
    • C07C51/43
    • C07C51/42C07C51/43C07C57/04
    • In a production method in which an acrylic acid-containing solution obtained from an acrylic acid-containing gas (or an acrylic acid-containing liquid obtained simply by subjecting the acrylic acid-containing solution to a separation process of reaction by-products) is directly subjected to a crystallization process, the crystallization process can't be carried out smoothly in an unsteady state (when the concentration of water in the acrylic acid-containing solution is high). The present invention aims to provide a method for collecting the purified acrylic acid having high purity in good yield even in an unsteady state.When the acrylic acid-containing solutions 18 and 16 have a concentration of water higher than 10 mass % (unsteady state), the purified acrylic acid 20 and 22 or the acrylic acid-containing solution 23 containing 10 mass % or less of water is mixed therewith to make the concentration of water 10 mass % or less [a] [b]. Alternatively, when the acrylic acid-containing solutions 18 and 16 have a concentration of water higher than 10 mass %, it is used as an absorption liquid [c]. Thereafter, the crystallization process is carried out.
    • 在由含有丙烯酸的气体(或通过使含丙烯酸溶液进行反应副产物的分离处理而得到的含丙烯酸的液体)得到的含丙烯酸溶液的制造方法中, 进行结晶化处理,结晶化处理不稳定(当含丙烯酸溶液中的水的浓度高时)不能平稳地进行。 本发明的目的在于提供即使在非稳定状态下收集纯度高的纯丙烯酸也能以良好的收率进行收集的方法。 当含丙烯酸的溶液18和16具有高于10质量%(非稳定状态)的水的浓度时,将纯化的丙烯酸20和22或含有10质量%以下的水的含丙烯酸的溶液23混合 从而使水的浓度为10质量%以下[a] [b]。 或者,当含丙烯酸的溶液18和16的水的浓度高于10质量%时,它被用作吸收液[c]。 此后,进行结晶过程。