Abstract
In this work, date juices were concentrated at low temperature by Vacuum Membrane Distillation (VMD). Tests were conducted at fixed operating conditions (feed flowrate, 28 L/h; feed temperature, 28 °C; vacuum pressure, 4 mbar) on two commercial flat polypropylene membranes, different in pore size and thickness. Date concentrates (70 °Bx) were obtained starting from juices at 18 °Bx, and pure permeates (0 °Bx) were collected. The water vapour trans-membrane flux depended on membrane properties until a concentration of ~50 °Bx was reached; then, the resistance at the feed side controlled the process.
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