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Isobaric vapor-liquid equilibrium for methanol+benzene+1-octyl-3-methylimidazolium tetrafluoroborate
Qunsheng Li,Baohua Wang,Wei Zhu,Yongquan Fu,Magtuf Zuhir,Lun Li 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.7
Isobaric vapor-liquid equilibrium (VLE) data for {methanol (1)+benzene (2)+1-octyl-3-methylimidazolium tetrafluoroborate (3)} where 3 is an ionic liquid ([OMIM]+[BF4]−) at atmospheric pressure (101.32 kPa) were measured with a modified Othmer still. The results showed that the ionic liquid studied can transfer the azeotropic point and eliminate the azeotropic phenomena when its concentration is up to x3=0.30. This means that [OMIM]+[BF4]− can be used as a promising entrainer in the application of extractive distillation. The measured ternary data were correlated using the NRTL model.
Purification of naphthalene from eutectic mixture by continuous column crystallization
Zhengming Yi,Qunsheng Li,Xufeng Sun,Minggao Su 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.2
To obtain highly purified naphthalene, a column crystallizer was employed and operated in the continuous multistage countercurrent fractional mode. The principles and characteristics of the process are introduced. A large amount of experimental work has been done on the crystallization process in a D=50 mm×1,350 mm column. The effects of operation conditions including the composition of feed, reflux ratio, stirring speed and the bed height of crystal on crystallization were systematically studied. The experiments showed that over 99.0% of the purity of product can be easily achieved in such conditions: feed composition among w=85.462-95.894%, reflux ratio among 1.42-4.04,the crystal bed height among 400-900 mm. The purity of product even reaches 99.996% in experiment.