An isocyanate production method according to the present invention is a method in which an isocyanate is produced by subjecting a carbamate to thermal decomposition, and includes: a step of preparing a mixture liquid containing the carbamate, an inactive solvent and a polyisocyanate compound; a step of conducting a thermal decomposition reaction of the carbamate by continuously introducing the mixture liquid into a thermal decomposition reactor; a step of collecting a low-boiling decomposition product by continuously extracting the low-boiling decomposition product in a gaseous state from the reactor, the low-boiling decomposition product having a boiling point lower than the polyisocyanate compound; and a step of collecting a high-boiling component by continuously extracting, from the reactor, a liquid phase component which is not collected in a gaseous state at the step of collecting the low-boiling decomposition product.
METHOD FOR PRODUCTION OF N-CARBOXY AMINO ACID ANHYDRIDE AND AMINO ACID CARBAMATE COMPOUND
申请人:Endo Takeshi
公开号:US20110152561A1
公开(公告)日:2011-06-23
A method for production of an N-carboxy amino acid anhydride with efficiency is provided. The method for production of an N-carboxy amino acid anhydride includes a step of reaction of an amino acid organic salt compound with a carbonic acid diester.
Method for production of N-carboxy amino acid anhydride and amino acid carbamate compound
申请人:Endo Takeshi
公开号:US08748650B2
公开(公告)日:2014-06-10
A method for production of an N-carboxy amino acid anhydride with efficiency is provided. The method for production of an N-carboxy amino acid anhydride includes a step of reaction of an amino acid organic salt compound with a carbonic acid diester.
提供了一种高效生产N-羧基氨基酸酐的方法。该方法包括将氨基酸有机盐化合物与碳酸二酯反应的步骤。
METHOD OF RESOLVING OPTICAL ISOMERS OF AMINO ACID DERIVATIVE
申请人:TOKUYAMA CORPORATION
公开号:EP1338588A1
公开(公告)日:2003-08-27
Provided is a separating method for an optical isomer mixture comprising the steps of mixing an amino acid derivative such as N-(tert-butoxycarbonyl)-DL-alanine in which optical isomers of a D type and an L type are present in a mixture with a hydrophilic compound such as β-cyclodextrin having a different affinity to two kinds of the optical isomers described above and then bringing the resulting aqueous solution or aqueous suspension into contact with a hydrophobic substance such as a solid matter subjected on a surface thereof to hydrophobic treatment on the condition that the pH is 3.5 or lower or under the coexistence of ions including an atomic group having hydrophobicity which can be a counter ion for the amino acid derivative described above such as a triethylammonium ion to thereby separate the D type amino acid derivative from the L type amino acid derivative present in the above aqueous solution or aqueous suspension.
本发明提供了一种光学异构体混合物的分离方法,该方法包括以下步骤:将氨基酸衍生物(如 N-(叔丁氧羰基)-DL-丙氨酸)与亲水性化合物(如对上述两种光学异构体具有不同亲和力的 β-环糊精)混合,在混合物中存在 D 型和 L 型光学异构体。对上述两种光学异构体具有不同亲和力的环糊精的混合物,然后将所得水溶液或水悬浮液与疏水性物质接触,如在其表面进行疏水处理的固体物质,条件是 pH 值为 3.5或更低的pH值,或在包括具有疏水性的原子团的离子共存的条件下,该原子团可以是上述氨基酸衍生物的反离子,例如三乙基铵离子,从而将上述水溶液或水悬浮液中的D型氨基酸衍生物与L型氨基酸衍生物分离。
N-CARBOXY AMINO ACID ANHYDRIDE AND AMINO ACID CARBAMATE COMPOUND PRODUCTION METHOD
申请人:JSR Corporation
公开号:EP2322515A1
公开(公告)日:2011-05-18
A method for production of an N-carboxy amino acid anhydride with efficiency is provided. The method for production of an N-carboxy amino acid anhydride includes a step of reaction of an amino acid organic salt compound with a carbonic acid diester.