Heat balanced paraffin upgrading with co-fed oxygenate
AssigneeMobil Oil Corporation
InventorsTai-Sheng Chou, Melcon G. Melconian
Life of this patent
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Abstract
The endothermic heat of reaction for zeolite-catalyzed paraffin aromatization is provided by a co-fed oxygenate stream. Advantageously, the addition of a dehydrogenation metal to the zeolite reduces the reaction temperature for paraffin aromatization to a range suitable for the exothermic conversion of an oxygenate to C.sub.5 + gasoline. Preferred paraffinic feedstreams include C.sub.3 -C.sub.4 LGP and the preferred oxygenate is methanol.
Claims20
A process for catalytically upgrading a feedstream containing C.sub.2 -C.sub.4 paraffins comprising the steps of:
- (a) maintaining a metal-containing zeolite catalyst within a reaction zone;
- (b) charging said feedstream containing C.sub.2 -C.sub.4 paraffins to said reaction zone under conversion conditions sufficient to convert at least a portion of said C.sub.2 -C.sub.4 paraffins to aromatics;
- and
- (c) cofeeding to said reaction zone an organic oxygenate at a flowrate such that the exothermic reaction of said organic oxygenate provides at least a portion of the endothermic heat of reaction for the conversion of said C.sub.2 -C.sub.4 paraffins.
A method for heat balancing a catalytic paraffin aromatization reaction zone to maintain said reaction zone at a desired conversion temperature between about 400.degree. and about 820.degree. C., said reaction zone containing a zeolite catalyst having a dehydrogenation metal component, said method comprising the steps of:
- (a) flowing a paraffinic feedstream and an oxygenate feedstream to said catalytic reaction zone under conversion conditions to convert at least a portion of said paraffinic feedstream to C.sub.5 + aromatics and at least a portion of said oxygenate feedstream to C.sub.5 + gasoline;
- (b) measuring the temperature of said catalytic reaction zone;
- (c) adjusting the relative flowrates of said oxygenate feedstream and said paraffinic feedstream to maintain a desired conversion temperature within said catalytic reaction zone by increasing the relative flowrate of said oxygenate feedstream if the measured catalytic reaction zone temperature of step (b) falls below said desired conversion temperature and decreasing the relative flowrate of said oxygenate feedstream if the measured catalytic reaction zone temperature of step (b) rises above said desired conversion temperature.
A process for converting a feedstream containing C.sub.2 -C.sub.4 paraffins to a product stream enriched in aromatics comprising the steps of:
- (a) maintaining a metal-containing zeolite catalyst within a reaction zone;
- (b) cofeeding said feedstream containing C.sub.2 -C.sub.4 paraffins to said reaction zone with an organic oxygenate under conversion conditions sufficient to convert at least a portion of both said C.sub.2 -C.sub.4 paraffins to aromatics and said organic oxygenate to gasoline boiling range hydrocarbons by controlling the relative flowrates of said feedstream containing C.sub.2 -C.sub.4 paraffins such that the exothermic reaction of said organic oxygenate provides at least a portion of the endothermic heat of reaction for the conversion of said feedstream containing C.sub.2 -C.sub.4 paraffins.
Dependencies are inferred from the claim text.