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    • 2. 发明授权
    • Process for the production of isopropenyl methyl ether
    • 异丙烯基甲基醚的制备方法
    • US06566559B2
    • 2003-05-20
    • US09871000
    • 2001-06-01
    • Steffen KrillStephan KretzVolker HäfnerGeorg Markowz
    • Steffen KrillStephan KretzVolker HäfnerGeorg Markowz
    • C07C4128
    • C07C41/38C07C41/28C07C43/15
    • Process for the production of unsaturated ethers, in particular isopropenyl methyl ether (IPM), by pyrolysis of a ketal-containing or acetal-containing mixture, in particular dimethoxypropane (DMP), in the liquid phase in the presence of an organic carboxylic acid, according to the following reaction scheme: wherein R1=H or alkyl with 1-8 C atoms; R2=H, CH3—, C2H5—, or Cl—; R3=alkyl with 1-8 C atoms; R4=H, CH3—, C2H5—, or C3H7—, and R1 and R4 may be joined to form a 5-, 6-, or 7-membered ring. DMP is produced by the process from acetone and methanol by reaction in an acidic heterogeneous ion exchanger, the product being isolated by extraction with aqueous alkaline solution. In particular the process involves combining the IPM reaction product with the DMP reaction product, which permits the execution of a stable recycling process in which the methanol-containing streams of the IPM and DMP stages can be simultaneously extracted. The product may be isolated by the process by simple distillation of IPM from a mixture containing IPM, DMP and acetone.
    • 通过在有机羧酸的存在下在液相中热解含缩酮或含缩醛的混合物,特别是二甲氧基丙烷(DMP),生产不饱和醚,特别是异丙烯基甲基醚(IPM)的方法, 根据以下反应方案:其中R1 = H或具有1-8个C原子的烷基; R2 = H,CH3-,C2H5-或Cl-; R3 =具有1-8个C原子的烷基; R 4 = H,CH 3 - ,C 2 H 5 - 或C 3 H 7 - ,并且R 1和R 4可以连接形成5-,6-或7-元环。 通过在酸性异质离子交换剂中反应,通过丙酮和甲醇的方法制备DMP,产物通过碱性水溶液萃取分离。 特别地,该方法包括将IPM反应产物与DMP反应产物组合,这允许执行稳定的再循环过程,其中可以同时萃取IPM和DMP阶段的含甲醇流。 通过从含有IPM,DMP和丙酮的混合物中简单蒸馏IPM可以通过该方法分离产物。