Refnement of Cane Molasses with Membrane Technology for Clarifcation and Color Removal

Document Type : Research Paper


State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190 China


Recovery of sugars from cane molasses (i.e. the by-product of sugar industries) is of great interest to industry and academia. The prerequisite for refning cane molasses is removal of pigments and suspended solids present in the molasses. In this work, the utilization of membrane separation for clarifcation and decoloration of cane molasses has been examined. Three operation modes (dilution-concentration, dilution-concentration-diafltration, and dilution-diafltration-concentration) were employed for color removal with a tight 2 kDa ultrafltration (UF) membrane. Results showed that the operation modes with diafltration could result in higher sugar recovery than dilution-concentration mode, though the latter had the higher permeate flux. Then, in order to further improve the permeate flux of the 2 kDa UF, fve pretreatments were carried out to remove suspended solids and large pigments. It was found that the pretreatment with ceramic membrane fltration was better than centrifuge and precipitation, particularly in terms of permeate flux for the tight UF membrane. Although the permeate flux for the tight UF after a UF pretreatment equipped with a 150 kDa UF membrane was higher than that with a 50 kDa UF membrane, the permeate flux during the pretreatment was the highest for the 50 kDa UF. The obtained decolorized syrup can be further purifed by nanofltration for the separation of sucrose and reducing sugars. Thus, refnement of cane molasses with membrane technology provides an alternative to conventional refnement methods and shows promising prospects of industrial application.

Graphical Abstract

Refnement of Cane Molasses with Membrane Technology for Clarifcation and Color Removal


Decoloration of cane molasses with tight 2 kDa UF
• Sugar recovery increased using operation modes with diafltration
• Improved flux obtained with pretreatment using 50 kDa UF


Main Subjects

[1] V.E. Baikow, Final Molasses, in: V.E. Baikow (Ed.), Manufacture and Refining of Raw Cane Sugar, Elsevier, Amsterdam, 2013, pp. 218-224.
[2] M.D. Harrison, Sugarcane-derived animal feed, in: I.M. O'Hara, S.G. Mundree (Eds.), Sugarcane-Based Biofuels and Bioproducts, John Wiley & Sons, Inc, Hoboken, NJ, USA, 2016, pp. 281-310.
[3] M. Sharma, S.N. Patel, K. Lata, U. Singh, M. Krishania, R.S. Sangwan, S.P. Singh, A novel approach of integrated bioprocessing of cane molasses for production of prebiotic and functional bioproducts, Bioresour. Technol. 219 (2016) 311-318.
[4] M.A. Godshall, Sugar and other sweeteners, in: J.A. Kent (Ed.) Kent and Riegel’s Handbook of Industrial Chemistry and Biotechnology, Springer US, Boston, MA, USA, 2007, pp. 1657-1693.
[5] J.C. Chen, C.C. Chou, Cane Sugar Handbook: A Manual for Cane Sugar Manufacturers and Their Chemists, John Wiley & Sons, Inc, New York, 1993.
[6] M. Kearney, V. Kochergin, Chromatographic applications in the cane sugar industry, Int. Sugar J. 103 (2002) 194-203.
[7] Z. Bubnik, V. Pour, A. Gruberova, H. Starhova, A. Hinkova, P. Kadlec, Application of continuous chromatographic separation in sugar processing, J. Food Eng. 61 (2004) 509-513.
[8] M. Asadi, Molasses-desugaring process, in: M. Asadi (Ed.) Beet-Sugar Handbook, John Wiley & Sons, Inc., Hoboken, NJ, USA, 2005, pp. 517-546.
[9] M. Thompson, The potential application of ion exclusion chromatography for additional sucrose recovery from molasses, Proc. S. Afr. Sug. Technol. Assoc. (1994) 105-108.
[10] V. Jegatheesan, L. Shu, G. Keir, D. Phong, Evaluating membrane technology for clarification of sugarcane juice, Rev. Environ. Sci. Bio-Technol. 11 (2012) 109-124.
[11] J. Luo, X. Hang, W. Zhai, B. Qi, W. Song, X. Chen, Y. Wan, Refining sugarcane juice by an integrated membrane process: Filtration behavior of polymeric membrane at high temperature, J. Membr. Sci. 509 (2016) 105-115.
[12] V. Kochergin, Membrane filtration of various sugar solutions, Proc. Amer. SOC. Sugar Beet Technol. 29 (1997) 359-373.
[13] M. Bernal, M.O. Ruiz, R.M. Geanta, J.M. Benito, I. Escudero, Colour removal from beet molasses by ultrafiltration with activated charcoal, Chem. Eng. J. 283 (2016) 313-322.
[14] R. Chandra, R.N. Bharagava, V. Rai, Melanoidins as major colourant in sugarcane molasses based distillery effluent and its degradation, Bioresour. Technol. 99 (2008) 4648-4660.
[15] G.L. Miller, Use of dinitrosalicylic acid reagent for determination oi reducing sugar, Anal. Chem. 31 (1959) 426-428.
[16] S.S. Nielsen, Phenol-sulfuric acid method for total carbohydrates, in: S.S. Nielsen (Ed.) Food Analysis Laboratory Manual, Springer, Boston, MA, USA, 2010, pp. 47-53.
[17] J. Luo, L. Ding, Y. Wan, P. Paullier, M.Y. Jaffrin, Application of NF-RDM (nanofiltration rotating disk membrane) module under extreme hydraulic conditions for the treatment of dairy wastewater, Chem. Eng. J. 163 (2010) 307-316.
[18] L. Huang, N.-N. Bui, M.T. Meyering, T.J. Hamlin, J.R. McCutcheon, Novel hydrophilic nylon 6,6 microfiltration membrane supported thin film composite membranes for engineered osmosis, J. Membr. Sci. 437 (2013) 141-149.
Volume 3, Issue 4
October 2017
Pages 303-307
  • Receive Date: 03 March 2017
  • Revise Date: 18 April 2017
  • Accept Date: 21 April 2017
  • First Publish Date: 01 October 2017