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    • 5. 发明授权
    • VERFAHREN UND VORRICHTUNG ZUR SYNTHESE VON BUTINDIOL
    • 方法和设备合成丁炔二醇。
    • EP0589977B1
    • 1995-03-01
    • EP92912341.2
    • 1992-06-17
    • Linde AktiengesellschaftYUKONG LIMITED
    • WIESSNER, Frank
    • C07C33/046C07C29/38
    • C07C33/046C07C29/38Y02P20/584
    • Formaldehyde and acetylene are usually converted into butynediol in the presence of a suspension catalyst in a cascade of reactors. The catalyst is separated from the product solution after the last reactor in the cascade and fed back into the first reactor. Here, depending on the degree of thickening of the suspension, a considerable proportion of the butynediol produced must also be fed into the first reactor of the cascade. This greatly hinders the conversion reaction into butynediol. Moreover, there is the risk of damage to the catalyst by a lack of acetylene, especially in the lines and the device for separating the catalyst from the product solution. According to the invention, the separation takes place in each individual reactor. This can be done by filters fitted in the reactor or suitable filter apparatuses outside the reactor. In the process of the invention, part of the catalyst in the reactors can be drawn off and replaced by regenerated and/or fresh catalyst. The catalyst drawn off from the reactors can advantageously be subjected to a regeneration. The exchange of the catalyst in the reactor may be intermittent or continuous. A quantity of catalyst of 50 - 200 g, preferably 75 - 125 g, is used in the reactors per litre of reaction solution.