Cellulose fiber-based filters
AssigneesRegents of the University of Minnesota, Agricultural Utilization Research Institute
InventorsBrock Lundberg, Lin Gu, Rongsheng Roger Ruan, Ling Chen, Paul Bradley Addis, Jack Edgar Johnson
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Abstract
The present invention comprises an improved method for refining cellulose that produces a highly refined cellulosic material. The method comprises soaking raw material in a mild NaOH using reduced temperatures and pressures, and refining the material with a plate refiner so that a waste water stream is reduced in volume and has a pH within a range of 8 to 9. The present invention also comprises a HRC gel having a lignin concentration of at least about one (1)% by weight, and a water retention capacity of about 25 to at least about 56 g H2O/g dry HRC.
Claims5
A filter comprising a highly refined cellulose having a lignin concentration of at least 1% by weight, and a water retention capacity of at least about 20 g H2O/g dry HRC.
Dependencies are inferred from the claim text.