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AssigneeAscend Performance Materials Operations LLC
InventorsY. T. CHI, Scott Moffatt, John Tjaden, Chelsea Loyd, Lori Ables
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The present disclosure relates to a process for stabilizing an antimony ammoxidation catalyst in an ammoxidation process. The process may comprise providing an antimony ammoxidation catalyst to a reactor; reacting propylene with ammonia and oxygen in the fluidized bed reactor in the presence of the antimony ammoxidation catalyst to form a crude acrylonitrile product; and adding an effective amount of an antimony-containing compound to the antimony ammoxidation catalyst to maintain catalyst conversion and selectivity; wherein the antimony-containing compound has a melting point less than 375° C. The present disclosure also relates to catalyst compositions and additional processes using the antimony ammoxidation catalyst stabilized by an antimony-containing compound.
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The process of claim 19, wherein the catalyst conversion is maintained within 10% of a target conversion over a period of at least 1 year.
The process of claim 19, wherein the catalyst selectivity to acrylonitrile is maintained within 10% of a target selectivity over a period of at least 1 year.
The process of claim 19, wherein the catalyst conversion is at least 45% over a period of at least 1 year.
The process of claim 19, wherein the catalyst selectivity to acrylonitrile is at least 50% over a period of at least 1 year.
The process of claim 19, wherein the antimony-containing compound is a solid.
The process of claim 19, wherein the adding is conducted at a temperature of less than 300° C.
The process of claim 19, wherein the antimony-containing compound comprises an antimony acetate.
The process of claim 19, further comprising the step of releasing antimony ammoxidation catalyst vapors from the antimony ammoxidation catalyst in the reactor.
The process of claim 19, wherein the adding comprises mixing replenishing the antimony ammoxidation catalyst with the antimony-containing compound.
The process of claim 19, wherein further comprises:
The process of claim 19, wherein the antimony-containing compound and the antimony ammoxidation catalyst comprises less than 1 wt % potassium, lithium, sodium, cesium, indium, rubidium, samarium, calcium, strontium, barium or tellurium.
The process of claim 19, wherein the antimony ammoxidation catalyst further comprises molybdenum and/or a molybdenum oxide.
The process of claim 19, wherein the adding step further comprises adding an effective amount of a molybdenum-containing compound to the antimony ammoxidation catalyst.
The process of claim 19, wherein the antimony-containing compound comprises antimony triacetate, antimony oxides, or organoantimony compounds, or combinations thereof.
The process of claim 19, wherein the adding further comprises adding at least one additive to the fluidized bed reactor.
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A process for producing acrylonitrile, the process comprising:
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Dependencies are inferred from the claim text.