Influences of Permeate Pressure and Feed Flow Rate on Benzene Removal from Gasoline by Pervaporation

Document Type: Research Paper


1 Chemical, Polymeric and Petrochemical Technology Development Research Division, Research Institute of Petroleum Industry (RIPI), Tehran, Iran

2 Gas Research Division, Research Institute of Petroleum Industry (RIPI), Tehran, Iran


In this work, the effects of permeate pressure and feed flow rate on the performance of a composite polyvinyl alcohol (PVA) membrane in the removal of benzene from gasoline by pervaporation (PV) were evaluated. The results indicate the remarkable effect of permeate pressure on membrane performance as reducing permeate pressure (higher vacuum) from 30 to 3 mmHg causes the total flux to increase from 6.6 to 51.7 g/hrm2 and from 12.2 to 79 g/hrm2 at 25 and 35 °C respectively. Furthermore, increasing feed flow rate enhances total flux and diminishes the amount of benzene in retentate (product) only below 1000 ml/min and has a negligible effect at higher flow rates.


      [1]     Loescher M. E., Podrebarac G. G., and Phan Q. T .C., “Process for Benzene Removal from Gasoline,” U. S. Patent, 8143466 B2, 2012.##

      [2]     Sanchez G. C. L., Munguia J. C., and Hernandez Perez F., “Process for Reducing Benzene Content of Hydrocarbon Stream Using Microporous Carbon Adsorbent,” U.S. Patent 8354019 B2, 2013.##

      [3]     Huang R. Y. M., “Pervaporation Membrane Separation Processes,” Elsevier Science Publishers, 1991, 20,109-111.##

      [4]     Mandal M. K. and Bhattacharya P. K., “Poly (vinyl acetal) Membrane for Pervaporation of Benzene–isooctane Solution,” Separation and Purification Technology, 2008, 61, 332-340.##

            [5]            Shen J. N., Chu Y. X., Ruan H. M., and Wu L. G., “Pervaporation of Benzene/ Cyclohexane Mixtures through Mixed Matrix Membranes of Chitosan and Ag+/Carbon Nanotubes,” Journal of Membrane Science, 2014, 462, 160-169.##

            [6]            Ribeiro C. P., Freeman B. D., Kalika D. S., and Kalakkunnath S., “Aromatic Polyimide and Polybenzoxazole Membranes for the Fractionation of Aromatic/Aliphatic Hydrocarbons by Pervaporation,” Journal of Membrane Science, 2012, 390, 182-193.##

      [7]     Maji S. and Banerjee S., “Preparation of New Semifluorinated Aromatic Poly (ether amide)’s and Evaluation of Pervaporation Performance for Benzene/Cyclohexane 50/50 Mixture,” Journal of Membrane Science, 2010, 349, 145-155.##

      [8]     Feng M., “Benzene Reduction from Gasoline by Pervaporation Using Cation-exchanged Membrane Containing Metal Lons,” AIChE Spring National Meeting, 2008.##

      [9]     Nagy E., “Basic Equations of the Mass Transport through a Membrane Layer,” Elsevier Science and Technology, 2012, 267-291.##

    [10]    Lin L., Kong Y., and Yang Shi., “Scale-up of Pervaporation for Gasoline Desulphurization: Part 1. Simulation and Design,” Journal of Membrane Science, 2007, 298, 1-13.##

         [11]         Neel J., Nguyen Q. T., Clement R., and Lin D. J., “Influence of Downstream Pressure on the Pervaporation of Water-tetrahydrofuran Mixtures through a Regenerated Cellulose Membrane (Cuprophan),” Journal of Membrane Science, 1986, 27, 217-232.##

    [12]    Smitha B., Suhanya D., and Ramakrishna M., “Separation of Organic-organic Mixtures by Pervaporation: a Review,” Journal of Membrane Science, 2004, 241, 1-21.##