Cellulose acetate hollow fiber performance for ultra-low pressure reverse osmosis

Cellulose acetate hollow fibers can be spun by a 3C-shaped spinneret, dry-jet wet technique and are suitable to operate at ultra-low pressure. The hollow fiber exhibits a higher flux of 4-6.5 gfd and salt rejection of 60-85% for tap water at 8 kg/cm(2). Cellulose acetate hollow fiber rejection against a variety of solutes, such as NaCl, CaCl2, MgSO4, Na2SO4, glucose, brulin and PVP 6000 were investigated. Cellulose acetate hollow fiber compaction and long term operation were tested. The result has shown that cellulose acetate hollow fibers spun by this method have achieved basically our desired target. They should find wide applications in the industrial process, such as ultrapure water production, food process, pharmaceutical manufacturing, brackish water desalting, and water softening.