Purification of High Fructose Corn Syrups by PVDF Membrane
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Abstract:
High fructose corn syrups (HFCS) are wide used in food industry. Traditional separation methods can not remove microorganisms, protein and colloidal substances in HFCS. In this research, the membrane separation technologies are used to clarify and purify HFCS using PVDF membrane. The effects of operating pressure, bulk concentration, temperature and flow rate of HFCS on membrane flux under different operating time were investigated and the online cleaning of membrane was also studied. The results showed that when the flux was stable with a value of up to 5.47 L/(m2?s), and pH, chrominance, light transmittance and insoluble solid content for permeate were 3.9, 43%, 99.2%, 0.192% and 4.5 mg/kg, respectively, under the optimum optimal operating conditions : pressure 0.20 MPa, temperature 70 ℃, purification time 80 min and circular flow 400 L/h. Furthermore, the recoverability of HFCS flux could achieve more than 90 % after the tubular membrane was cleaned for 1 min when closing the value.
