A process for fractionating an amine-containing mixture which comprises one or more amines, water, low-boilers and optionally high-boilers, having the steps (i) to (v):
(i) optionally separating off by distillation a (first) low-boiler fraction from the amine-containing mixture,
(ii) optionally separating off by distillation a (first) high-boiler fraction from the amine-containing mixture,
(iii) extracting the amine-containing mixture with sodium hydroxide solution, producing an aqueous, sodium-hydroxide-containing first phase and an aqueous-organic, amine-, (further) low-boiler- and possibly (further) high-boiler-containing second phase,
(iv) distilling the aqueous-organic second phase, producing essentially anhydrous amine as bottom-phase takeoff or sidestream takeoff in the stripping part of the distillation column, an amine/water azeotrope as sidestream takeoff in the enrichment part of the column and a (further) low-boiler fraction as overhead takeoff, and recycling the amine/water azeotrope to the extraction step (iii),
(v) optionally further purifying or fractionating the essentially anhydrous amine.
一种分馏含胺混合物的工艺,该混合物包括一种或多种胺、
水、低沸点和可选的高沸点,其步骤(i)至(v)为
(i) 通过蒸馏从含胺混合物中分离出(第一)低沸点馏分、
(ii) 可选地通过蒸馏从含胺混合物中分离出(第一)高沸点馏分、
(iii) 用
氢氧化钠溶液萃取含胺混合物,产生含
水的
氢氧化钠第一相和含
水的有机胺、(进一步)低沸点和可能(进一步)高沸点第二相、
(iv) 蒸馏含
水有机物的第二相,在蒸馏塔的汽提部分以底相脱液或侧流脱液 的形式生产出基本为无
水的胺,在蒸馏塔的富集部分以侧流脱液的 形式生产出胺/
水共沸物,以高空脱液的形式生产出(进一步的)低沸 度馏分,并将胺/
水共沸物循环至萃取步骤 (iii)、
(v) 可选地进一步纯化或分馏基本无
水的胺。