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US 3,970,742 AGranted
Process for preparing cyanic acid
AssigneeStamicarbon B.V.
InventorJohannes D. M. Verstegen
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Abstract
The invention is directed to a process for preparing cyanic acid from urea, comprising atomizing urea in a tubular reactor in the presence of a stream of a carrier gas to obviate the formation and deposition of by-products on the inner walls of the tubular reactor, thereby increasing the efficiency and production yields of the process.
Claims8
A process for preparing cyanic acid from urea by evaporating urea in a tubular reaction zone, comprising
- atomizing molten urea into a stream of carrier gas, passing the resulting mist of fine urea droplets in said carrier gas through said tubular reaction zone,
- heating the tubular reaction zone so that the temperature of the gas mixture leaving the reaction zone is at least 250.degree.C,
- wherein said carrier gas is introduced into the reaction zone at a rate at least equal to V, wherein ##EQU2## where V = superficial gas velocity at the entrance of the tubular reactor, in m/sec.
- a = amount of carrier gas/amount of urea in m.sup.3 (N.T.P.)/kg
- .rho..sub.o 32 density of carrier gas at 0.degree.C and 1 atm. abs., in kg/m.sup.3
- T = temperature of carrier gas, in .degree.K
- p = feed pressure of carrier gas, in kg/cm.sup.2 abs.
- n.sub.g = viscosity of carrier gas, in centipoises
5 more elements
Dependencies are inferred from the claim text.