In addition to these reactions and depending on the reaction conditions, various other compounds may precipitate, such as ammonium bicarbonate (N[H.sub.4]HC[O.sub.3]), ammonium carbonate [[(N[H.sub.4]).sub.2]C[O.sub.3]],
ammonium carbamate (N[H.sub.4]N[H.sub.2]C[O.sub.2]), and ammonium sesquicarbonate [[(N[H.sub.4]).sub.2]C[O.sub.3.sup.-]N[H.sub.4]HC[O.sub.3]].
Toxicity is due to the formation of
ammonium carbamate (Lewis, 1960).
With a corrosive service like
ammonium carbamate, N[H.sub.3] release to the atmosphere is a serious threat.
Ammonium carbonate (30% ammonia), ammonium bicarbonate (99%),
ammonium carbamate (99%), DBU (98%), 1-hexadecylamine (90%), ditert-butyi dicarbonate (99%), and calcium sulfate dihydrate (gypsum, 98%) were used as received from Sigma Aldrich (Oakville, ON).
This reaction produces
ammonium carbamate, which is subsequently decomposed into urea under a pressure of 5 atmospheres.