Abstract:
PROBLEM TO BE SOLVED: To improve qualities of piperazine, especially its color and color stability in a method for continuously distilling and removing piperazine from a mixture of ethylenediamine and piperazine by distilling the mixture under high-pressure at elevated temperature, discharging ethylenediamine from the top of a distillation column and piperazine from the bottom of the distillation column. SOLUTION: The method for continuously distilling and removing piperazine from a mixture of ethylenediamine and piperazine comprises a process of direct circulation treatment in which piperazine discharged from the bottom of the distillation column is transported through an evaporation apparatus operated at about 160-about 170°C and returned to the distillation apparatus and a process in which piperazine is retained in a system for the circulation treatment for 30-about 60 minutes and then discharged in a state of vapor from a side discharge port at the bottom of the distillation column. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
Disclosed is a method for producing ethyleneamines, in which ethylene oxide (EO) is continuously reacted with ammonia on an inorganic ion exchanger as a heterogeneous catalyst in anhydrous conditions in a first reaction stage, the obtained reaction product containing monoethanolamine (MEOA), diethanolamine (DEOA), and triethanolamine (TEOA) at a weight ratio MEOA: DEOA: TEOA = 80 - 94: 5.9 - 15: 0.1 - 5, and the reaction product is then continuously reacted with ammonia in the presence of hydrogen and a heterogeneous hydrogenation catalyst in a second reaction stage.
Abstract:
Preparation of ethylenamine comprises continuous reaction of ethylene oxide with ammonia on an inorganic ion-exchanger as a heterogeneous catalyst in an anhydrous condition, where the obtained reaction product consists of monoethanolamine, diethanolamine and triethanolamine in a weight ratio of 80-94:5.9-15:0.1-5, respectively, and continuous reaction of the reaction product with ammonia in the presence of hydrogen and a heterogeneous hydrogenation catalyst.
Abstract:
Continuous distillative separation of piperazine from ethylenediamine-piperazine mixture comprises subjecting the piperazine mixture into a cyclic motion, introducing the piperazine mixture into an evaporator unit at 160-170[deg]C, recycling the piperazine mixture into a distillation column and removing the piperazine from the sump of the distillation column after a retention time of approximately 30-60 minutes, where the ethylene diamine is discharged at the upper portion of the distillation column.