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    • 43. 发明公开
    • Adolisation-dehydration process
    • Adolisation-脱水过程
    • EP0751109A1
    • 1997-01-02
    • EP96115200.6
    • 1993-04-07
    • Davy Process Technology Limited
    • Harrison, George EdwinDennis, Alan JamesReason, Arthur JamesSharif, Mohammad
    • C07C45/74C07C45/72C07C45/66C07C45/82C07C45/81C07C47/21
    • C07C45/66C07C45/72C07C45/74C07C45/81C07C45/82Y02P20/584
    • An aldolisation-dehydration process is disclosed for converting an aldehyde, e.g. n -valeraldehyde, to a substituted acrolein, e.g. propyl butyl acrolein (2-propylhept-2-enal). Aldolisation and dehydration are effected in a stirred tank reactor (16;111) using an alkali catalyst, such as sodium hydroxide. A reaction product stream (23;113) containing both organic and aqueous phases is supplied to an intermediate section of a distillation zone (25;123) which further includes a higher temperature section below the intermediate section and a lower temperature distillation section. Decomposition aldols and "heaving" to regenerate aldehyde or aldehydes occurs in the higher temperature section of the distillation column so that aldehyde or aldehydes are recoverable from the top of the distillation section in a heterogeneous azeotrope containing water and aldehyde. On condensation and phase separation the lower water layer (34;150) can be discharged from the plant without the need for neutralisation. From the bottom of the distillation zone a mixture (36;157) of substituted acrolein and alkali catalyst solution is obtained. The substituted acrolein is recovered as product (45;173), while the catalyst solution (47;175) is recycled to the aldolisation reactor. Part (49;181) of the catalyst solution is purged to control the level of Cannizzaro reaction products.
    • 公开了一种醛醇缩合脱水方法,用于将醛, 正戊醛,取代的丙烯醛,例如丙烯醛。 丙基丁基丙烯醛(2-丙基庚-2-烯醛)。 使用碱性催化剂如氢氧化钠在搅拌釜反应器(16; 111)中进行醛醇化和脱水。 含有有机相和含水相两者的反应产物流(23; 113)被供应到蒸馏区(25; 123)的中间部分,该中间部分还包括位于中间部分下方的较高温度部分和较低温度的蒸馏部分。 在蒸馏塔的较高温度部分发生分解醛醇和“升高”以再生醛或醛,从而醛或醛可在含有水和醛的非均相共沸物中从蒸馏部分顶部回收。 在冷凝和相分离时,下层水层(34; 150)可以从设备排出而不需要中和。 从蒸馏区的底部获得取代丙烯醛和碱催化剂溶液的混合物(36; 157)。 取代的丙烯醛作为产物(45; 173)回收,而催化剂溶液(47,175)再循环到醛醇化反应器中。 清除催化剂溶液的部分(49; 181)以控制坎尼扎罗反应产物的水平。