Patent ID: 9725408
Date: 2017-08-08
CPC Classifications: C07C,C11B

Claim:
1. A method of recovering urea from a urea/oil complex, comprising: a) combining a marine or microbial oil comprising 30% or more of at least one polyunsaturated fatty acid having a carbon chain length of at least 20 with urea in the presence of solvent to form a urea/oil complex and an oil/solvent mixture, wherein the urea:oil ratio is about 0.1:1 to about 2:1, and wherein the oil comprises DHA and/or EPA as a C b) separating the urea/oil complex from the oil/solvent mixture; c) removing solvent from the urea/oil complex, thereby forming a dried urea/oil complex that contains less than 1 wt. % solvent; d) combining the dried urea/oil complex with water, thereby forming an aqueous concentrated urea solution and an organic phase; e) separating the aqueous concentrated urea solution and the organic phase; and f) removing water from the aqueous concentrated urea solution, thereby providing a recovered urea.