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AssigneeThe Standard Oil Company
InventorsWilfrid G. Shaw, Kenneth L. Bigler, Louis R. Trott, Steve J. Miko, Vincent G. Reiling, Michael J. Seely, Dev D. Suresh, Maria S. Friedrich, Paul E. Bott, Edward J. Sockell, Albert R. Shuki, Jr., Kenneth P. Keckler, Frank J. Kojancic
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A process for the substantial or complete elimination of ammonium sulfate generated during the production of acrylonitrile by the direct ammoxidation of propylene/propane, ammonia and an oxygen containing gas (e.g. air) over a fluid bed catalyst wherein the improvement comprises introducing an organic compound(s) into said reactor at a location where the compound(s) reacts with substantially all of the excess ammonia without affecting the acrylonitrile yield. Preferably, the organic compound is methanol which is introduced into the reactor at below its coking temperature.
A process for the elimination of ammonia breakthrough and ammonium sulfate production during the manufacture of acrylonitrile comprising introducing into the lower portion of a fluid bed reactor a hydrocarbon selected from the group consisting of propylene and propane, ammonia and oxygen containing gas to react in the presence of a fluid bed catalyst to produce acrylonitrile, introducing an oxygenate comprising methanol at a temperature below its coking temperature into the upper portion of the fluid bed reactor at a point where the methanol does not substantially affect the reaction of the hydrocarbon, ammonia and oxygen containing gas to produce acrylonitrile and reacts with substantially all the unreacted ammonia present in the reactor to substantially eliminate the presence of any free ammonia in the reactor effluent exiting said reactor, passing the reactor effluent containing acrylonitrile and substantially free of any unreacted ammonia into a quench column to cool the reactor effluent with water in the absence of sulfuric acid to remove unwanted impurities and recovering the acrylonitrile from the quench column.
The process of claim 7 wherein the methanol is injected into the reactor through a conduit which is capable of maintaining the temperature of the methanol below its coking temperature prior to exit into the reactor.
A method for the substantial elimination of ammonia breakthrough during the manufacture of acrylonitrile comprising introducing a hydrocarbon selected from the group consisting of propane and propylene, ammonia and an oxygen containing gas into the lower portion of a fluid bed reactor containing a fluid bed ammoxidation catalyst to react in the presence of said catalyst to produce acrylonitrile wherein the improvement comprises introducing an oxygenate comprising methanol in an upward direction into the upper portion of the fluid bed reactor at a point where the methanol does not substantially effect the reaction of the hydrocarbon, ammonia and oxygen containing gas to produce acrylonitrile and reacts with substantially all of the unreacted ammonia present in the reactor to substantially eliminate ammonia from the reactor effluent exiting the reactor.
Dependencies are inferred from the claim text.