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题名: Influence of Pressure Gradient on Column Efficiency in GC Separations
作者: Hao, Weiqiang1;  Di, Bin2;  Chen, Qiang1;  Yang, Yongbin1;  Wang, Junde3
刊名: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
发表日期: 2012-06-27
DOI: 10.1021/ie202774d
卷: 51, 期:25, 页:8669-8674
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: Pressure gradient along the column in gas chromatography leads to the decompression of the carrier gas and thus varied flow velocity that can be accounted for by the Darcy's law. By solving mathematical models such as the equilibrium dispersive (ED) and the transport models, which account for axial dispersion and mass transfer processes between mobile and stationary phases, respectively, the expressions for retention time and plate height under such nonuniform condition were obtained. As a first approximation, it is assumed that pressure gradient has little affect on the mass transfer coefficients such as axial dispersion coefficient (D) and lumped mass transfer coefficient (k(f)). It is found that, by using average flow velocity ((u) over bar) that includes the parameter of inlet-outlet pressure ratio (gamma), the expressions obtained from the transport model can be reduced to the mathematical forms of the expressions deduced by assuming uniform flow velocity. By contrast, the expressions obtained from the ED model show some differences. These results indicate the coupling effect between pressure gradient and axial dispersion. In most practical cases, retention time expressions obtained from these models are consistent due to large value of average Peclet number. The plate height accounting for axial dispersion effects will vary from 2D /(u) over bar to 2.7D /(u) over bar when gamma changes from 1 to infinity.
关键词[WOS]: MASS-TRANSFER KINETICS ;  LIQUID-CHROMATOGRAPHY ;  GAS-CHROMATOGRAPHY ;  PLATE HEIGHT ;  CAPILLARY COLUMNS ;  FRONTAL ANALYSIS ;  RETENTION TIMES ;  LINEAR MEDIUM ;  IDEAL MODEL ;  PREDICTION
语种: 英语
WOS记录号: WOS:000305719500034
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143038
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Nanjing Univ, High Tech Res Inst, Changzhou 213164, Peoples R China
2.China Pharmaceut Univ, Dept Pharmaceut Anal, Nanjing 210009, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Hao, Weiqiang,Di, Bin,Chen, Qiang,et al. Influence of Pressure Gradient on Column Efficiency in GC Separations[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,2012,51(25):8669-8674.
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