化工学报Issue(8):2953-2961,9.DOI:10.11949/j.issn.0438-1157.20150753
规整填料塔中离子液体吸收CO2的传质与流体力学性能
Mass transfer and hydraulic performance of CO2 absorption by ionic liquids over structured packings
摘要
Abstract
In this work, ionic liquids (ILs) were proposed for the capture of CO2 over the structured packings. The pressure drop and mass transfer coefficient were investigated using computational fluid dynamics (CFD). The relationship among the structure of ILs, performance of pressure drop and mass transfer coefficient, as well as the relationship among the corrugation angles of structured packings, performance of pressure drop and mass transfer coefficient were identified. The results showed that under the same operating conditions with same anion, the increase of carbon number in the alkyl chain on the cation of ILs leads to the increase of the pressure drop (i.e., [HMIM][Tf2N] > [BMIM][Tf2N] > [EMIM][Tf2N]), and decrease of the mass transfer coefficient (i.e., [EMIM][Tf2N] > [BMIM][Tf2N] > [HMIM][Tf2N]). Thus, the cation [EMIM] is the optimum choice with regard to the pressure drop and mass transfer performance. Moreover, for ILs with different anions the pressure drop and mass transfer coefficient show the same trend,i.e., [EMIM][BF4] > [EMIM][TFA]≈ [EMIM][TfO] > [EMIM][Tf2N]. There is an inverse relationship between the mass transfer coefficient and solubility of CO2 for different ILs. Thus, there is a tradeoff when choosing IL for the capture of CO2. In addition, four types of structured packings with different corrugation angles (X type, Y type, and two transition types) were compared. From the viewpoint of mass transfer performance the two transition types structured packings are superior to thetraditional X or Y types.关键词
离子液体/传质/二氧化碳/吸收/规整填料/压降/计算流体力学Key words
ionic liquid/mass transfer/carbon dioxide/absorption/structured packing/pressure drop/computational fluid dynamics (CFD)分类
化学化工引用本文复制引用
代成娜,项银,雷志刚..规整填料塔中离子液体吸收CO2的传质与流体力学性能[J].化工学报,2015,(8):2953-2961,9.基金项目
国家自然科学基金项目(21476009,21406007, U1462104)。 ()