润滑油糠醛精制双塔回收过程的模拟与分析

摘要

A model for double column recovery process in lube furfural refining was established, which was based on the principle of the hetrogeneous azeotrope with low azeotropic point in the furfural-water system. The activity coefficient was calculated by UNIFAC equation. The operating features of the furfural drying column and the aqueous solution stripper were discussed by utilizing the calculation result from the model. The dry furfural can be obtained and the composition of the tops was close to the composition of furfural-water azeotrope. It was proposed to minimize the stripping steam of the aqueous solution stripper at the premise of a qualified drainage.%根据糠醛装置双塔回收工艺利用糠醛-水系统非均相低共沸性质的过程原理，建立了润滑油糠醛精制双塔回收模型，模型中采用 UNIFAC 方程计算活度系数；利用模型计算的结果讨论了糠醛干燥塔和水溶液汽提塔的操作特性。通过对糠醛干燥塔中热醛汽流量的控制，可获得干燥糠醛，并使塔顶馏出物的组成接近糠醛-水共沸组成；在保证废水含醛达到排放标准的情况下，水溶液汽提塔中吹入的汽提蒸汽量应尽量少。