such as ethylenediamine ethylene glycol methyl ethanolamine isopropanol amine and water were ineffective entrainers for this purpose the tertiary amine has all of the nitrogen valences occupied and is therefore relatively non polar as compared with the primary amine which has only one substituent on the nitrogen atom two amines which fulfill the requirements set out above are bis 2 aminoethyl ether and n 2 methoxyethyl morpholine bis 2 aminoethyl ether baee and n 2 methoxyethyl morpholine mem are both by products in the production of morpholine from diethylene glycol and ammonia this method of producing morpholine is referred to in u s pat nos 2 412 209 and 3 151 112 incorporated by reference herein however baee and mem are difficult to separate from each other by conventional distillation because they have close boiling points the method of this invention allows for separating these two co products so that both may be productively used the method involves azeotropic distillation of the mixed co product stream with monoethanolamine which selectively removes mem from the mixture once the baee and the mem have been separated baee may be methylated and used most economically as polyurethane catalyst the mem may be recovered from the monoethanolamine by reaction and separation but the present economic disposition of the entire stream is to burn it at the present time any value the baee mem mixture may have resides in the separated baee the monoethanolamine should be employed in excess quantities economic considerations for this novel extraction process will set an upper limit on the amount of entrainer which should be used the azeotrope occurs at about 2 1 1 atm and excess entrainer makes for an easier separation when the pressure is reduced to 50 mm hg entrainer in an.