04701555 is referenced by 7 patents and cites 6 patents.

The biuret content of biuret-containing urea is reduced by contacting a solution or melt of biuret-containing urea with a polar adsorbent under conditions sufficient to remove at least a portion of biuret from the urea. The resulting biuret-containing adsorbent can be regenerated for further use by contact with a polar desorbent under conditions sufficient to desorb at least a portion of the biuret contained on the adsorbent. Optionally, biuret can be recovered by recovering the biuret-containing desorbent, and biuret concentration in the desorbent can be increased by recycling the biuret-containing desorbent into contact with biuret-containing adsorbents, and biuret can be recovered from the desorbent by low temperature crystallization.

Title
Methods for removing biuret from urea by adsorption
Application Number
6/753692
Publication Number
4701555
Application Date
July 10, 1985
Publication Date
October 20, 1987
Inventor
James A Green II
Chino
CA, US
Donald C Young
Fullerton
CA, US
Agent
D Sandford
G Wirzbicki
Michael H Laird
Assignee
Union Oil Company of California
CA, US
IPC
C07C 126/08
C07C 127/24
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