Abstract:
PROBLEM TO BE SOLVED: To provide a method for obtaining recovery of N-alkyl substituted pyrrolidone simply with a high purity grade equal to quality for electronics grades efficiently at a reduced cost and in high yield.SOLUTION: The method for purifying N-alkyl substituted pyrrolidone containing at least one or a plurality of impurities represented by formulae I to VII comprises following steps, a step (I) of preparing a mixture containing at least a kind of N-alkyl substituted pyrrolidones and 1 to 20,000 ppm of at least a compound of formulae I to VII, a step (II) of hydrogenating the mixture from the step (I), and a step (III) of distilling the mixture from the step (II).
Abstract:
Process for the continuous preparation of N-ethyl-2-pyrrolidone (NEP) by reacting gamma-butyrolactone (GBL) with monoethylamine (MEA) in the liquid phase, wherein GBL and MEA are used in a molar ratio in the range from 1:1.08 to 1:2 an the reaction is carried out at a temperature in the range from 320 to 420° C. and an absolute pressure in the range from 70 to 120 bar.
Abstract:
Procedimiento para la purificación de pirrolidonas N-alquil-sustituidas que contienen una o más de las impurezas de fórmula I a VII en las que R se selecciona del grupo formado por hidrógeno, grupos alquilo C1-C20 lineales o ramificados, que comprende las etapas de: I) preparación de una mezcla que comprende al menos una pirrolidona N-alquil-sustituida, al menos un compuesto de fórmula I a VII en cantidades de 1 a 20000 ppm II) hidrogenación de la mezcla de la etapa I) III) destilación de la mezcla obtenida en la etapa II).
Abstract:
La presente invención se refiere a N-(ciclo)alquilpirrolidonas como solventes para aplicación en métodos para producir dispersiones de poliuretano.
Abstract:
La presente invención se refiere a N-(ciclo)alquilpirrolidonas como solventes para aplicación en métodos para producir dispersiones de poliuretano.
Abstract:
A process for preparing an N-alkyllactam with improved color quality, wherein from 0.01 to 10% by weight of a C1-10-alcohol or a compound which releases from 0.01 to 10% by weight of a C1-10-alcohol is added to the N-alkyllactam. A mixture comprising at least 99.0% by weight of an N-alkyllactam and in the range from 100 to 5000 ppm by weight of a C1-10-alcohol or of an acetal, aminal or of an Orthoester which releases in the range from 100 to 5000 ppm by weight of a C1-10-alcohol.