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1.发明授权
公开(公告)号：US4563308A
公开(公告)日：1986-01-07
申请号：US643026
申请日：1984-08-21
IPC分类号： C07D201/16 , C07D201/04
CPC分类号： C07D201/16
摘要： Process the recovering caprolactam from the residue remaining following the distillation, under reduced pressure, of impure caprolactam obtained by rearrangement of cyclohexanone oxime with sulphuric acid or oleum, by distilling the residue under reduced pressure whereby a caprolactam-containing distillate is obtained; hydrogenating the caprolactam containing distillate in an aqueous medium to obtain a hydrogenation product; and recovering caprolactam from the resulting hydrogenation product.
摘要翻译： 在减压下，通过将环己酮肟与硫酸或发烟硫酸重排而得到的不纯的己内酰胺在减压蒸馏后残留的残余物中处理回收的己内酰胺，通过在减压下蒸馏残余物，得到含己内酰胺的馏出物; 在含水介质中氢化含己内酰胺的馏出物得到氢化产物; 并从所得氢化产物中回收己内酰胺。
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公开(公告)号：US4216151A
公开(公告)日：1980-08-05
申请号：US964790
申请日：1978-11-28
IPC分类号： C07D207/263 , C07D201/16 , C07D207/26
CPC分类号： C07D201/16
摘要： A process for the recovery of 2-pyrrolidone from the aqueous reaction product obtained in the preparation of 2-pyrrolidone from the hydrogenation of succinonitrile and subsequent reaction with water of the hydrogenation product thus obtained. The aqueous reaction mixture is adjusted to a pH value of 7 or lower and extracted with chloroform or methylene chloride to form an organic phase containing substantially all of the 2-pyrrolidone. The 2-pyrrolidone can be recovered from the organic phase by distillation, or by further extraction with water followed by crystallization from the aqueous phase thus formed or by evaporation of water.
摘要翻译： 从由琥珀腈的氢化制备2-吡咯烷酮得到的水性反应产物和随后与如此得到的氢化产物与水的反应中回收2-吡咯烷酮的方法。 将水性反应混合物调节至pH值为7以下，用氯仿或二氯甲烷萃取，形成基本上含有所有2-吡咯烷酮的有机相。 可以通过蒸馏从有机相中回收2-吡咯烷酮，或者通过进一步用水萃取，然后从由此形成的水相或通过蒸发水结晶。
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公开(公告)号：US4384125A
公开(公告)日：1983-05-17
申请号：US271933
申请日：1981-06-09
IPC分类号： C07D207/26 , C07D201/16 , C07D207/267
CPC分类号： C07D201/16
摘要： In a distillation process 2-pyrrolidones obtained from succinonitrile are purified by treating the impure liquid pyrrolidone with a strong base, fractionally distilling this product to yield, as distillate, polymerization grade purified 2-pyrrolidone, mixing the 2-pyrrolidone-containing residue from the fractional distillation with water and an acid, and extracting purified 2-pyrrolidone from the water/acid mixture. The latter purified 2-pyrrolidone products are suitable for recycling to the pyrrolidone synthesis or to make other products.
摘要翻译： 在蒸馏过程中，由琥珀腈获得的2-吡咯烷酮通过用强碱处理不纯的液体吡咯烷酮来纯化，分馏出该产物，得到作为馏出物的聚合级纯化的2-吡咯烷酮，将含2-吡咯烷酮的残留物从 用水和酸分馏，从水/酸混合物中提取纯化的2-吡咯烷酮。 后者纯化的2-吡咯烷酮产物适用于回收到吡咯烷酮合成或制备其它产物。
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