The effects of membrane permeability with several types with molecular weight cut-off levels of from 5, 000 to 30, 000, on the flux and quality of raw and limed cane juice on ultrafiltration were studied by long-term testing for 2-3 hr. The flux of raw juice showed a remarkably high value when ultrafiltration was performed with a YM-30 membrane, for which the sucrose rejection was 5-7%. The flux through a YM-5 membrane was the greatest, and the value did not drop during ultrafiltration of juice limed to pH 7.0 at 85°C. The sucrose rejection for the permeate with the YM5 membrane was very low, i.e. 0-1.2%, for juice limed to pH 7.0 at 85°C.
The YM-30 membrane was suitable for the ultrafiltration of raw juice, while for juice limed under the optimum conditions of pH 7.0 at 85°C, the YM-5 membrane was more suitable.

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