Amidation of vinyl chloride with dimethylamine using a supported
palladium catalyst
    39.
    发明授权
    Amidation of vinyl chloride with dimethylamine using a supported palladium catalyst 失效
    使用负载型钯催化剂用二甲胺胺化氯乙烯

    公开(公告)号:US5312984A

    公开(公告)日:1994-05-17

    申请号:US950441

    申请日:1992-09-23

    申请人: Paul P. Nicholas

    发明人: Paul P. Nicholas

    CPC分类号: C07C233/02 C07C233/09

    摘要: A continuous process for making N,N-dimethylacrylamide (NNDMA) is disclosed which uses a commodity chemical, namely vinyl chloride (VCl), which is amidated with dimethylamine (DMA) and carbon monoxide in the presence of a supported palladium(O) triorganophosphine catalyst used under conditions where the ratio of P/Pd is critical. The continous process unexpectedly provides the catalyst with long life because the reaction can be carried out in a moving bed of catalyst in the presence of enough acetonitrile solvent to prevent deposition of DMA.HCl, formed during the reaction, in the pores of the catalyst support.

    摘要翻译: 公开了制备N,N-二甲基丙烯酰胺(NNDMA)的连续方法,其使用商品化学品即氯乙烯(VCl),其在负载的钯(O)三有机膦存在下与二甲胺(DMA)和一氧化碳酰胺化 催化剂在P / Pd比例至关重要的条件下使用。 连续方法意外地提供了催化剂的长寿命,因为反应可以在催化剂的移动床中在足够的乙腈溶剂的存在下进行,以防止反应期间形成的DMA.HCl沉积在催化剂载体的孔中 。

    Purification process of methacrylamide
    40.
    发明授权
    Purification process of methacrylamide 失效
    甲基丙烯酰胺的净化过程

    公开(公告)号:US5302754A

    公开(公告)日:1994-04-12

    申请号:US961020

    申请日:1992-10-14

    IPC分类号: C07C231/24 C07C233/09

    CPC分类号: C07C231/24

    摘要: A purification process of crude methacrylamide by recrystallization from an aqueous methacrylamide solution, comprising the steps of conducting crystallization by adjusting the hydrogen ion concentration of the aqueous methacrylamide solution to pH 8 or more, separating a methacrylamide crystal, adjusting 5% by weight or more of resulting mother liquor to pH 5 or less, separating precipitated insoluble matter, and reusing thus-treated mother liquor, is provided.The high quality methacrylamide crystal thus obtained is excellent in Hazen number, purity and transparency of a methanol solution and suitable for uses such as windshield glasses.

    摘要翻译: 通过从甲基丙烯酰胺水溶液中重结晶,粗制甲基丙烯酰胺的纯化方法,包括通过将甲基丙烯酰胺溶液的氢离子浓度调节至pH8以上进行结晶的步骤,分离甲基丙烯酰胺结晶,调节5重量%以上 得到母液至pH5以下,分离沉淀的不溶物,并重新使用如此处理的母液。 由此获得的高品质甲基丙烯酰胺晶体的哈森数,纯度和甲醇溶液的透明度优异,适用于挡风玻璃等用途。