Process for the removal of urea from aqueous solutions

Details Process for the removal of urea from aqueous solutions Process for the removal of urea from aqueous solutions

1976-01-27

1983-07-12

Spear, Jr., Frank A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210654, 2105002, B01D 1300

Patent

active

043929605

ABSTRACT:
A process for the removal of urea from an aqueous solution containing same, which comprises subjecting the solution to reverse osmosis through a polymeric membrane prepared from a polymer of the formula

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patent: 3567632 (1971-03-01), Richter et al.
patent: 3686116 (1972-08-01), Rio
patent: 3822202 (1974-07-01), Hoehn
patent: 3825493 (1974-07-01), Brown et al.
patent: 3899309 (1975-08-01), Hoehn et al.
McKinney et al. "Aromatic Polyamide Membranes for Preverse Osmosis Separation "Macromolecules", vol. 4, No. 5, Sep., Oct. 1971, pp. 633-637.
Lonsdule et al. "Study of Rejection of Various Solutes by R. O. Membranes," R & D Prog. Rept. No. 447, 7/69, U.S. Dept. of Interior Contract No. 14-01-0001-1717.
Agrawal et al., "Specification, Selectivity, and Performance of Porous Cellulose Acetate Membranes in Reverse Osmosis," I & EC Process, Design and Development, vol. 8, No. 4, Oct. 1969, pp. 439-449.
Amore et al., "Research on Reverse Osmosis Membranes for Purification of Wash Water at Sterilization Temperature (165.degree. F.)" Office of Saline Water Report No. 815 (1972), Abstract Page. _
Wydeven et al., "Performance of Cellulose Acetate Butyrate Membranes in Hyper-filtration of Sodium Chloride and Urea Feed Solution," Journal of Applied Polymer Science, vol. 17, pp. 2277-2287 (1973).
Lawrence et al., "Development of a Reverse Osmosis Module for Wash Water Recycling in a Space Environment at 165.degree. F.", Office of Saline Water Report _No. 905 (INT-OSW-RDPA-74-905), (1974), cover page and pp. 8 and 9.
Poist et al., "Development of Improved PBI Membrane Systems for Wash Water Recycling at Pasteurization Temperatures," Office of Saline Water Report No. 995, (1974), cover page and pp. 40-41.
Gregor et al., "Synthetic-Membrane Technology," Scientific American, vol. 239, pp. 112-128, Jul. 1978.

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