A process for the isolation of amines from aqueous solutions by continuous distillation of aqueous solutions of the amines by a two-pressure method of rectifying aqueous solutions of amines which form with water an azeotrop, the composition of which is pressure-dependent, in two columns at different pressures provided that: a) the pressure in the second column is set to a value at least 0.5 bar higher than in the first column, b) the aqueous amine solution is fed, as a side stream, to the first column, and water and portions which boil at a higher temperature than the amine or which are non-volatile are removed at the base of the column, c) a mixture of amine and water is withdrawn at the head of the first column and fed, as a side stream, to the second column, d) an azeotrope of water and amine is withdrawn at the head of the second column and recycled to the first column, and (e) the purified amine is discharged at the base of the second column.
一种通过连续蒸馏胺
水溶液从
水溶液中分离胺的工艺,该工艺采用双压法,在不同压力下的两个塔中对与
水形成共沸物的胺
水溶液进行精馏,共沸物的组成取决于压力,条件是:a) 第二塔中的压力至少比第一塔中的压力高 0.a) 第二根塔的压力至少比第一根塔的压力高 0.5 巴, b) 将胺
水溶液作为侧流送入第一根塔,并在塔底除去
水和沸腾温度高于胺的部分或不挥发的部分、c) 在第一柱的柱头抽出胺和
水的混合物,并作为侧流送入第二柱, d) 在第二柱的柱头抽出
水和胺的共沸物,并循环到第一柱,以及 e) 在第二柱的柱底排出净化后的胺。