US PATENT SUBCLASS 564 / 70
.~.~.~.~.~ With decomposition of by-product ammonium carbamate (i.e., decomposition of HNH-COO-HHNHH)

Current as of: June, 1999
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564 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ AMINO NITROGEN CONTAINING (E.G., UREA, SULFONAMIDES, NITROSAMINES, OXYAMINES, ETC., AND SALTS THEREOF) {37}
32  DF  .~.~ Ureas (i.e., HNH-CO-HNH, wherein substitution may be made for hydrogen only) {9}
63  DF  .~.~.~ Urea per se or salt thereof {5}
67  DF  .~.~.~.~ Preparing directly from ammonia and carbon dioxide {3}
70.~.~.~.~.~ With decomposition of by-product ammonium carbamate (i.e., decomposition of HNH-COO-HHNHH) {2}
71  DF  .~.~.~.~.~.~> Utilizing indirect heat exchange
72  DF  .~.~.~.~.~.~> In plural stages

DEFINITION

Classification: 564/70

(under subclass 67) Processes wherein by-product ammonium carbamate is decomposed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

66, for the preparation of urea directly from ammonium carbamate.