METHOD FOR DISTILLING MIXTURES COMPRISING ETHYLENE DIAMINE N- METHYLETHYLENE DIAMINE AND WATER AND MIXTURES OF ETHYLENE DIAMINE AND N- METHYLETHYLENE DIAMINE HAVING A LOW CONTENT OF N- METHYLETHYLENE DIAMINE OBTAINABLE THEREBY•

摘要

The invention relates to a mixture of ethylene diamine (EDA) and N-methylethylene diamine (Me-EDA) having a low content of Me-EDA, characterized in that the mixture comprises at least 99.5% by weight of ethylene diamine and the concentration of N-methylethylene diamine is in the range of 0.005 to 0.15% by weight. The invention further relates to a method for distillative preparation of a mixture comprising EDA, Me-EDA, and water, the mixture being introduced into a distillation column operated at a column head pressure of 10 mbar to 4 bar, characterized in that the weight ratio of water to ethylene diamine in the mixture used is a*X : Y, where X is the weight proportion of water and Y is the weight proportion of ethylene diamine at the azeotropic point of a binary mixture of water and ethylene diamine at the applicable column head pressure, and a is a real number having a value of 0.9 or greater. The invention further relates to a method for producing a distillable mixture comprising EDA, Me-EDA, and water, suitable for producing EDA having a low content of Me-EDA. WO2011067226A1