PVDF管式膜纯化果葡糖浆的研究

Purification of High Fructose Corn Syrups by PVDF Membrane

摘要:

果葡糖浆在食品工业中有着广泛的应用，而传统的分离方法无法除去糖液中的微生物等小颗粒，更不能除去蛋白质、胶体等物质。为此需要通过膜分离技术来实现糖液的澄清和纯化。本文采用PVDF管式膜材质分离纯化果葡糖浆，考察了不同运行时间下操作压力、料液浓度、料液温度和循环流量对果葡糖浆通量的影响，确定了最佳的操作条件，并对膜的在线清洗工艺进行了研究。当操作压力为0.20 MPa，循环流量为400 L/h，和料液温度70 ℃时，果葡糖浆的稳定通量达到5.47 L/(m2?s)，果葡糖浆透过液的pH为3.9，色度、透光度、浊度和不溶性颗粒物含量分别为43%、99.2%、0.192%和4.5 mg/kg，完全达到生产要求；管式膜在关闭透过液出水阀门的条件下以料液清洗1 min时，果葡糖浆通量的恢复率可达90%以上。

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.