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    • 3. 发明授权
    • Method for the continuous preparation of methionine or methionine
derivatives
    • 连续制备甲硫氨酸或甲硫氨酸衍生物的方法
    • US5672745A
    • 1997-09-30
    • US416900
    • 1995-05-23
    • Hans-Albrecht HassebergKlaus HuthmacherStephan RautenbergHeinrich PetschHorst Weigel
    • Hans-Albrecht HassebergKlaus HuthmacherStephan RautenbergHeinrich PetschHorst Weigel
    • C07C319/20C07C323/58C07C321/00
    • C07C319/20
    • The direct saponification of methionine nitrile obtained from methylmercaptopropionaldehyde, prussic acid and ammonia gives low yields, catalyst and educt losses and unwanted side-products. The aim of the invention is therefore to provide a method which can be carried out without isolating the intermediate products, in particular continuously, and with low losses. The ketone used is recovered in high yields after amide saponification since this liberates the ketone from side-products. In order to recover the ammonia, it is necessary for the ammonia to be substantially freed of ketone, the mixture of ammonia, ketone and water obtained being separated under pressure in a separation column. When the amide is saponified at .gtoreq.160.degree. C., amide concentrations of less than 25% by wt. are preferred. Methionine nitrile is produced by treatment with at least 4 equivalents of .gtoreq.50% by wt. ammonia at between 40.degree. and 80.degree. C./or between 5 and 60 min. Cyanide residues are destroyed by heating to over 150.degree. C. Methionine is of particular use as a feedstuff, in particular in aqueous solution.
    • PCT No.PCT / EP93 / 02838 Sec。 371日期:1995年5月23日 102(e)日期1995年5月23日PCT提交1993年10月14日PCT公布。 出版物WO94 / 08957 日期1994年4月28日由甲基巯基丙醛,氢氰酸和氨获得的甲硫氨酸腈的直接皂化产生低产率,催化剂和离子液体损失以及不需要的副产物。 因此,本发明的目的是提供一种方法,其可以在不隔离中间产物的情况下进行,特别是连续地且以低损耗隔离。 使用的酮在酰胺皂化后以高收率回收,因为这释放出来自副产物的酮。 为了回收氨,需要将氨基本上除去酮,得到的氨,酮和水的混合物在分离塔中在压力下分离。 当酰胺在≥160℃皂化时,酰胺浓度小于25重量% 是优选的。 甲硫氨酸腈通过用至少4当量≥50重量%进行处理来生产。 在40℃和80℃之间或在5和60分钟之间的氨。 氰化物残留物通过加热至150℃以上被破坏。甲硫氨酸特别用作饲料,特别是在水溶液中。