Patent ID: 8313756

Claim:
A method of making a urea containing mixture, comprising: combining a first phase and a second phase to form a combined phase, wherein the first phase comprises a first portion of urea and the second phase comprises a lipid and an antioxidant; cooling the combined phase to form a cooled combined phase; after the cooling step, adding a second portion of urea to the cooled combined phase to form a mixture having a weight percent (wt-%) of urea that in the absence of an inhibitor is capable of forming crystals, wherein the wt-% of urea in the mixture is greater than 40 wt-% urea up to about 60 wt-% urea, wherein the first phase or the second phase includes an amount of one or more inhibitors effective to reduce the crystallization of the urea in the mixture, wherein one of the inhibitors comprises hydroxyethylcellulose, xanthan gum, polypropylene glycol, or propylene glycol.