Methods of isolating urea, urea compositions and methods for producing the same

1. Field of the Invention Urea is readily isolated and recovered from natural products. Urea can be brought into the permeate side by treating a urea-containing fraction extracted from natural products or sewage containing urea, with a nanofiltration (NF) membrane or reverse osmotic (RO) membrane. A...

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Bibliographic Details
Main Authors Morita, Minoru, Serizawa, Atsushi, Motsuchi, Wataru, Yamamoto, Haruyoshi, Kotani, Masanori, Yamane, Yoriko
Format Patent
LanguageEnglish
Published 14.01.2003
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Summary:1. Field of the Invention Urea is readily isolated and recovered from natural products. Urea can be brought into the permeate side by treating a urea-containing fraction extracted from natural products or sewage containing urea, with a nanofiltration (NF) membrane or reverse osmotic (RO) membrane. A milk-derived composition containing urea at a level of more than 0.2% of the total solids can be obtained by treating natural products such as milk or milk materials with an NF membrane or RO membrane to bring a fraction containing urea into the permeate side.