Use of ultrafiltration and ion exchange processes for syrup production from pineapple mill juice
1992
Jiraporn Kijsipongse
Study of syrup production from pineapple wastes by ultrafiltration and ion exchange process was conducted. Types of pectinase enzyme were investigated to improve flux rate of ultrafiltration process (UF). Performance of various resin types of ion exchanger and effects of processing parameters on generation and regeneration rate were studied. In enzyme pretreatment, Pectinex Ultra SP-L at dosage of 100 ppm gave the highest flux rate at 88.4 l/square m/hr in UF process by using tubular membrane with molecular weight cut off 18,000 Daltons. In ion exchange process, selection of resin was conducted at flow rate of 30 ml/min which contact time was 10 min and bed volume of resin was 300 ml. Three types of styrene resin of each ion exchanger were compared. Alimentech was selected as suitable cation resin which gave operation volume of 6750 ml and regeneration volume of 2100 ml. For anion resin, Dowex 66 was chosen for suitable type due to its operation and regeneration of 1800 ml. The investigation of processing parameters was studied on Dowex resin for manufacturer feasibility. The operating flow rate for ion exchanger was optimized at 20 ml/min for maximum yield. In regeneration of cation resin, 1400 ml of 5 % HCl solution was required at flow rate of 10 ml/min, whereas 1800 ml of 4 % NaOH solution was needed for anion resin at 30 ml/min. The concentrated pineapple syrup which composes of fructose, glucose and sucrose is much clear, neutral and trace amount of ions still remains.
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This bibliographic record has been provided by Thai National AGRIS Centre, Kasetsart University
