会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 1. 发明授权
    • Process for preparing lactate
    • 制备乳酸盐的方法
    • US5824818A
    • 1998-10-20
    • US698478
    • 1996-08-15
    • Takafumi AbeToshiyuki GotohTakako UchiyamaHirofumi HiguchiYoshikazu ShimaKazuto Ikemoto
    • Takafumi AbeToshiyuki GotohTakako UchiyamaHirofumi HiguchiYoshikazu ShimaKazuto Ikemoto
    • C07C67/20C07C69/66
    • C07C67/20
    • A process for preparing a lactate which includes: (a) preparing lactonitrile from prussic acid and acetaldehyde, (b) hydrating the lactonitrile to form lactamide, (c) forming the desired lactate and formamide from lactamide and formate (or methanol and carbon monoxide), (d) separating and collecting components, having a lower boiling point than that of lactate from the reaction liquid in step (c), by distillation under specified conditions, and (e) dehydrating formamide from step (d) to form prussic acid and recycling the prussic acid to step (a). Heretofore, lactates had been manufactured by forming lactonitrile (cyanohydrin) from acetaldehyde and prussic acid, and then esterifying lactonitrile with a mineral acid or the like. However, in this conventional process, ammonium salts were formed as by-products in an amount equal to that of the lactate. According to the present invention, a lactate can be efficiently manufactured on a commercial scale without forming a large amount of the ammonium salts as by-products. In particular, the yield of the lactate can be increased by controlling the formation of 2-formyloxy propionate and also a dimer of a lactate.
    • 一种制备乳酸的方法,其包括:(a)从丙二酸和乙醛制备乳腈,(b)使乳腈水合形成乳酰胺,(c)从乳酰胺和甲酸盐(或甲醇和一氧化碳)形成所需的乳酸盐和甲酰胺, ,(d)在步骤(c)中通过蒸馏从特定条件下蒸馏分离和收集沸点低于乳酸盐的组分,并且(e)从步骤(d)中将甲酰胺脱水形成二甲苯, 将重要的酸回收到步骤(a)。 迄今为止,已经通过从乙醛和氢溴酸形成乳腈(氰醇),然后用无机酸等使乳腈酯化来制造乳酸盐。 然而,在该常规方法中,形成铵盐,其量等于乳酸盐的副产物。 根据本发明,可以以商业规模有效地制造乳酸盐,而不会形成大量的作为副产物的铵盐。 特别地,通过控制2-甲酰氧基丙酸酯和乳酸二聚体的形成可以提高乳酸产率。
    • 8. 发明授权
    • Process for recimization of an optically active alpha-amino acid amides
and process for producing optically active alpha-amino acids
    • 用于重新获得光学活性α-氨基酸酰胺的方法和用于制备光学活性α-氨基酸的方法
    • US4918196A
    • 1990-04-17
    • US831915
    • 1986-02-21
    • Masaharu DoyaToshio KondoHideo IgarashiTakako Uchiyama
    • Masaharu DoyaToshio KondoHideo IgarashiTakako Uchiyama
    • C07D233/72C12P13/04C12P41/00
    • C12P41/006C12P13/04
    • A process for optically isomerizing an optically active alpha-amino acid amide comprising heating a D-alpha-amino acid amide or an L-alpha-amino acid amide in the presence of a strongly basic compound; and a process for producing an L-alpha-amino acid, which comprises(1) subjecting a D,L-alpha-amino acid amide or a mixture of a major amount of a D-alpha-amino acid amide and a minor amount of an L-alpha-amino acid amide to the action of a microorganism having the ability to hydrolyze the L-alpha-amino acid to obtain a hydrolyzate containing the L-alpha-amino acid and D-alpha-amino acid,(2) separating the L-alpha-amino acid from the hydrolyzate and recovering the remaining D-alpha-amino acid amide.(3) heating all or part of the recovered D-alpha-amino acid amide in the presence of a strongly basic substance to obtain a D,L-alpha-amino acid amide or a mixture of a major amount of the D-alpha-amino acid amide and a minor amount of the L-alpha-amino acid amide, and(4) recycling the D,L-alpha-amino acid amide or the mixture to step (1) as part or all of the starting material.
    • 包括光学异构化光学活性α-氨基酸酰胺的方法,包括在强碱性化合物存在下加热D-α-氨基酸酰胺或L-α-氨基酸酰胺; 以及制备L-α-氨基酸的方法,其包括(1)使D,L-α-氨基酸酰胺或主要量的D-α-氨基酸酰胺和少量的 L-α-氨基酸酰胺,具有水解L-α-氨基酸的能力的微生物的作用,得到含有L-α-氨基酸和D-α-氨基酸的水解产物,(2)分离 来自水解产物的L-α-氨基酸并回收剩余的D-α-氨基酸酰胺。 (3)在强碱性物质存在下加热全部或部分回收的D-α-氨基酸酰胺,得到D,L-α-氨基酸酰胺或大量D-α-氨基酸酰胺的混合物, 氨基酸酰胺和少量的L-α-氨基酸酰胺,和(4)将D,L-α-氨基酸酰胺或混合物循环到步骤(1)中作为起始原料的一部分或全部。