Study on rapid concentration of juice based on sweeping gas membrane distillation
Aiming at the problem that the longer concentration time of juice will lead to more loss of beneficial components,a rapid concentration membrane distillation module based on sweeping gas membrane distillation was designed. The mathematical model was established to calculate and analyze the variation of concentration of the feed liquid flowing out of the membrane module and the double concentration time with the temperature of feed liquid,the inner diameter of membrane tube,the flow rate of sweeping gas(air) and the membrane pore diameter. The results show that the double concentration time of the feed liquid is 40 ～ 100 s under typical operating parameters. The relative influence coefficients of double concentration time with the temperature of feed liquid,the inner membrane tube diameter,the flow rate of air and the membrane pore diameter are 130.6％,10.2％,9.8％ and 5.9％ respectively. Increasing the temperature of the feed liquid,reducing the inner diameter of membrane tube,increasing the flow rate of air and the membrane pore diameter are beneficial to reduce the double concentration time of the feed liquid. When the temperature of feed liquid is 60 ℃,concentration of the feed liquid flowing in the membrane module is 10％,concentration of the feed liquid flowing out the membrane module is 40％,the retention rates of vitamin C,total phenolic content and total carotenoid content in orange juice are 97.99％,98.59％ and 98.30％,respectively. The research can provide reference for the development of rapid concentration device for thermosensitive food liquid.
juice concentrationrapid concentrationlow-temperature concentrationatmospheric evaporative concentrationsweeping gas membrane distillation
万方数据
维普
