Document Type : Research Paper


University of Technology-Iraq, Department of Chemical Engineering, Iraq, Baghdad


In this work, effluent wastewater treated by using cyclopentane-water Clathrate system to treat water contaminates with phenols at concentrations (300, 250, 200, 150, 100 and 50) ppm in order to investigate the capability of process performance. Clathrate or hydrate are strong crystal structures including water (host particles) and little particles (guest particles). The experiments were conducted at different cyclopentane-water volume ratios (1: 2 and 1: 4). The work was done in a 250 ml glass cell with an electric mixer at a constant speed of 280 cycles per minute. Phenol was highest removal percent at 300ppm at 1: 4volume ratio was (92.3%), while the lowest concentration at 50 ppm and 1: 2volume ratio was (55%). Yield and Enrich factor had the highest values at the lowest concentration 50ppm and 1:2 volume ratio were (85% and 2.42) respectively. The technique of the Clathrate proved that it has a high capacity in the separation and achieve high removal percentage compared to other methods at standard conditions when the pressure of 1 atmosphere and temperature higher than the degree of freezing water and less economic costs compared to other methods..


[1] W. Anku, M. Mamo, P. Govender,” Phenolic compounds in water: sources, reactivity, toxicity and treatment methods. In Phenol compounds-natural sources”, importance and applications, Intech Open, 2017.
[2] F. Khalid,” Extraction of phenolic pollutants (phenol and p-chlorophenol) from industrial wastewater”, Journal of Chemical & Engineering Data, 58,6, 1549-1564, 2013.
[3] H. Hashemi, S. Babaee, A. Mohammadi, P. Naidoo, D. Ramjugernath,” Experimental measurements and thermodynamic modeling of refrigerant hydrates dissociation conditions”, The Journal of Chemical Thermodynamics, 80, 30-40,2015.
[4]R. Kazemi, A. Azimi, A. Azari, M. Ansarpour,” Removal of heavy metals from industrial wastewaters: a review”, Chem. Bio Eng. Reviews, 4, 1, 37-59, 2017.
[5] S. Sun, L. Cai, B. Pethica, P. Debenedetti,” Formation kinetics of cyclopentane–methane binary Clathrate hydrate”, Chemical Engineering Science, 119, 147-157,2014.
[6] L. Villegas, N. Mashhadi, M. Chen, D. Mukherjee, K. Taylor , N. Biswas,” A short review of techniques for phenol removal from wastewater”, Current Pollution Reports, 2,3, 157-167, 2016.
[7] S. Kulkarni, J. Kaware,” Review on research for removal of phenol from wastewater”, International Journal of Scientific and Research Publications, 3,4, 1-5, 2013.
[8] O. Abdi, M. Kazemi,” A review study of biosorption of heavy metals and comparison between different biosorbents”, J. Mater. Environ. Sci, 6,5, 1386-1399, 2015.
[9] National Research Council,” Prudent practices in the laboratory: handling and management of chemical hazards, updated version”, National Academies Press, 2011.
[10] H. Polat, M. Molva, M. Polat,” Capacity and mechanism of phenol adsorption on lignite”, International Journal of Mineral Processing, 79, 4, 264-273, 2006.
[11] D. Zhong, J. Wang, Y. Lu, Z. Li , J. Yan,” Precombustion CO2 capture using a hybrid process of adsorption and gas hydrate formation”, Energy, 102, 621-629, 2016.
[12] A. Trueba,” Phase behavior, kinetics and structural aspects of (semi-) Clathrate hydrate systems”, Ph.D. Thesis, University of Technology, Eindhoven, Netherland, 2014.
[13] W. Lee, J. Min, Y. Ahn, S. Baek , C. Koh ,” Effect of Naphthenate Formation on the Anti-Adhesive Behavior of Clathrate Hydrates at a Water–Oil Interface”, Industrial & Engineering Chemistry Research, 58,12, 5064-5070, 2019.
[14] J. Peixinho, P. Karanjkar, J. Lee, J. Morris,” Rheology of hydrate forming emulsions”, Langmuir, 26,14,11699-11704, 2010.
[15] S.J. Cox, D.J. Taylor, T.G. Youngs, A.K. Soper, T.S. Totton, R.G. Chapman, M. Arjmandi, M.G. Hodges, N.T. Skipper, A. Michaelides,. Formation of methane hydrate in the presence of natural and synthetic nanoparticles. Journal of the American Chemical Society, 140, 9, 3277-3284, 2018.
[16] L. Cai, B. Pethica, P. Debenedetti , S. Sundaresan,” Formation kinetics of cyclopentane–methane binary Clathrate hydrate”, Chemical Engineering Science, 119, 147-157, 2014.
[17] M. Karamoddin, F. Varaminian, "Study on the growth process of HCFC141b hydrate in isobaric system by a macroscopic kinetic model", International Journal of Refrigeration, 1-25. 20, 2014.
[18] Y. Song, H. Dong, L. Yang, Y. Li, Z. Ling , J. Zhao,” Hydrate-based heavy metal separation from aqueous solution”, Scientific reports, 6, 21389, 2016.
[19] P. Ngema, P. Naidoo, A. Mohammadi, D. Richon, , D. Ramjugernath,” Thermodynamic stability conditions of Clathrate hydrates for refrigerant (R134a or R410a or R507) with MgCl2 aqueous solution”, Fluid Phase Equilibria, 413, 92-98, 2016.
[20] S. Frois, M. Grassi, M. Campos , G. Abate,” Determination of Cr (vi) in water samples by ICP-OES after separation of Cr (iii) by montmorillonite”, Analytical Methods, 4,12, 4389-4394, 2012.
[21] E. Dirdall, C. Arulanantham, H. Sefidroodi, M. Kelland,” Can cyclopentane hydrate formation be used to rank the performance of kinetic hydrate inhibitors”, Chemical engineering science, 82, 177-184, 2012.
[22] H. Sefidroodi, E. Abrahamsen , M. Kelland,” Investigation into the strength and source of the memory effect for cyclopentane hydrate”, Chemical engineering science, 87, 133-140, 2013.
[23] B. Abdulkader,” Cyclopentane hydrate for hydrate wetting studies”, Msc. thesis, The University of Bergen, 2013.
[24] G. Zylyftari,” Hydrate forming emulsion: A rheological, thermodynamic and morphological study”, Phd. thesis, The City College of New York, 2014.
[25] H. Delroisse, F. Plantier, L. Marlin, C. Dicharry, L. Frouté, R. André , J. Torré,” Determination of thermophysical properties of cyclopentane hydrate using a stirred calorimetric cell”, The Journal of Chemical Thermodynamics, 125, 136-141, 2018.
[26] S. Mustafa,” Study the Effect of Different Promoters on Thermodynamic Behavior for Refrigerant Gas Clathrate Hydrate System “Msc. Thesis, Chemical Engineering Department - University of Technology, 2018.
[27] S. Talib, S. Riyadh , M. Naser,” Removal Heavy Metals from Industrial wastewater by using of cyclopentane - Clathrate hydrate formation technology”, Fourth International Conference on Buildings, Construction and Environmental Engineering - BCEE4 , Istanbul - Turkey , October 7 - 9, 2019.
[28] J.Cha, Y. Seol,” Increasing gas hydrate formation temperature for desalination of high salinity produced water with secondary guests”, ACS Sustainable Chemistry & Engineering, 1,10, 1218-1224, 2013.
[29]X. Feng, Z. Wu , X. Chen,” Removal of metal ions from electroplating effluent by EDI process and recycle of purified water”, Separation and purification Technology, 57,2, 257-263, 2007.
[30] R. Ohmura, T. Shigetomi ,Y. Mori,” Formation, growth and dissociation of Clathrate hydrate crystals in liquid water in contact with a hydrophobic hydrate-forming liquid”, Journal of crystal growth, 196,1, 164-173, 1999.
[31]R. Fujioka, L. Wang, G. Dodbiba, T. Fujita,” Application of progressive freeze-concentration for desalination”, Desalination, 319, 33-37, 2013.