摘要:
The present invention relates to a method for producing a complex crystal composed of two or more different compounds, comprising crystallizing the two or more different compounds under a condition at which menthol is heat melted, and a method for screening a complex crystal. In accordance with the method for producing a complex crystal of the present invention, a complex crystal capable of being used as a drug material can be produced rapidly, simply and efficiently. In addition, in accordance with the method for screening a complex crystal of the present invention, a stable complex crystal can be searched, which is industrially useful.
摘要:
The present invention relates to a method for producing a complex crystal composed of two or more different compounds, comprising crystallizing the two or more different compounds under a condition at which menthol is heat melted, and a method for screening a complex crystal. In accordance with the method for producing a complex crystal of the present invention, a complex crystal capable of being used as a drug material can be produced rapidly, simply and efficiently. In addition, in accordance with the method for screening a complex crystal of the present invention, a stable complex crystal can be searched, which is industrially useful.
摘要:
A water floatable tablet, which is either: (a) a tablet comprising at least one filler selected from the group consisting of a sugar alcohol, a sugar, a cellulose derivative, and a starch and a component which exhibits a hydrophobic effect, wherein the tablet has a hollow cavity in a center section; or (b) a tablet obtained by a process including: (1) forming a crust comprising at least one filler selected from the group consisting of a sugar alcohol, a sugar, a cellulose derivative, and a starch on an outer surface of a core comprising a sublimation solid, to obtain a dry coated tablet having the core positioned at a center section; (2) heating the dry coated tablet, to obtain a tablet having a hollow cavity; and (3) contacting the tablet having a hollow cavity with a component which exhibits a hydrophobic effect.
摘要:
A process for producing methionine advantageously in view of cost, while efficiently recovering useful components, is provided including the following steps: (1) hydrolyzing 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione in the presence of a basic potassium compound; (2) introducing carbon dioxide into the reaction solution obtained in the step (1) to thereby precipitate methionine, and separating the resulting slurry into a precipitate and a mother liquor; (3) concentrating the mother liquor obtained in the step (2), mixing the resulting concentrate with a lower alcohol, introducing carbon dioxide into the resulting mixture to thereby precipitate methionine and potassium hydrogencarbonate, and separating the resulting slurry into a precipitate and a mother liquor; and (4) concentrating the mother liquor obtained in the step (3), treating the resulting concentrate by heating at a temperature of from 150 to 200° C., and recycling the treated solution for use in step (2).
摘要:
A process for producing methionine advantageously in view of cost, while efficiently recovering useful components, is provided, including the following steps (1) hydrolyzing 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione in the presence of a basic potassium compound; (2) introducing carbon dioxide into the reaction solution obtained in step (1) to thereby precipitate methionine, and separating the resulting slurry into a precipitate and a mother liquor; (3) concentrating the mother liquor obtained in step (2), mixing the resulting concentrate with a lower alcohol, introducing carbon dioxide into the resulting mixture to thereby precipitate methionine and potassium hydrogencarbonate, and separating the resulting slurry into a precipitate and a mother liquor; and (4) concentrating the mother liquor obtained in step (3), treating the resulting concentrate by heating at a temperature of from 150 to 200° C., and recycling the treated solution for use in step (3).
摘要:
The present invention provides a process for producing methionine which is advantageous from the viewpoints of cost and wastewater disposal, and which comprises the following steps (1) to (5):(1) a reaction step comprising hydrolysis of 5-[2-(methylthio)ethyl]imidazolidine-2,4-dione in the presence of a basic potassium compound; (2) a first crystallization step comprising introduction of carbon dioxide into the reaction solution obtained in the step (1) to precipitate methionine, and separation of the resultant slurry into a precipitate and a mother liquor; (3) a second crystallization step comprising concentration of the mother liquor obtained in the step (2), mixing with a lower alcohol, introduction of carbon dioxide into the mixture to precipitate methionine and potassium hydrogen carbonate, and separation of the resultant slurry into a precipitate and a mother liquor; (4) a heating step comprising concentration of the mother liquor obtained in the step (3) followed by a heating treatment at 150 to 200° C.; and (5) a third crystallization step comprising introduction of carbon dioxide into the heated mother liquor obtained in the step (4) to precipitate methionine and potassium hydrogen carbonate, and separation of the resultant slurry into a precipitate and a mother liquor.