Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
1985-07-10
1987-10-06
Warren, Charles F.
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
564 73, C07C12724, C07C12608
Patent
active
046984437
ABSTRACT:
Purified biuret is recovered from mixtures containing biuret and higher molecular weight urea condensation products by contacting melts or solutions of such mixtures with a polar adsorbent and extracting biuret from the adsorbent with a polar desorbent. The useful biuret-containing mixtures also may contain urea. These methods are capable of recovering biuret of 99.9 percent plus purity from mixture containing higher molecular weight urea condensations products such as triuret, melamine, ammelide, and others. The biuret-containing desorbent can be recycled into contact with biuret-containing adsorbents to increase its biuret concentration, concentrated by evaporation of otherwise, and/or treated to crystallize biuret. An integrated process is provided which involves pyrolyzing urea to form biuret and higher molecular weight condensation products and selectively recovering biuret from the resulting pyrolyzed urea as described.
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Green, II James A.
Young Donald C.
Greason Carolyn S.
Laird Michael H.
Sandford Dean
Union Oil Company of California
Warren Charles F.
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