Cumene → 1-Ethenyl-4-methylbenzene
Reaction equation
C1(C(C)C)C=CC=CC=1.[CH2:10]([C:12]1[CH:17]=[CH:16][C:15]([CH3:18])=[CH:14][CH:13]=1)[CH3:11]>>[CH3:18][C:15]1[CH:16]=[CH:17][C:12]([CH:10]=[CH2:11])=[CH:13][CH:14]=1Participants
Procedure
This example illustrates the dehydrogenation of cumene and p-ethyltoluene using a diluent comprising steam and nitrogen. Three and three-tenths grams of the catalyst prepared in Example II, ground to 18 to 40 mesh, was employed in the reactor described in Example II. Initially p-ethyltoluene was flowed into the reactor at 0.38 liquid hour space velocity, 11:1 diluent to p-ethyltoluene ratio (8:1 steam and 3:1 nitrogen) at 588° C., yielding a relatively poor conversion and selectivity. The catalyst was decoked with 5% oxygen and nitrogen for about 1 hr. Cumene was then run at 0.38 liquid hour space velocity, 11:1 diluent ratio (8:1 steam and 3:1 nitrogen) at 588° C. providing 40% conversion to alphamethylstyrene and 88% selectivity. The feed was then switched from cumene to p-ethyltoluene using the same diluent dilution and conditions providing 22% conversion to p-methylstyrene and 93% selectivity. Conditions were then changed to 0.72 liquid hour space velocity, 10:1 diluent ratio for the p-ethyltoluene (8:1 steam and 2:1 nitrogen) at 598° C., yielding 40% conversion and 92% selectivity to p-methylstyrene.
Sources & evidence
- ORD record
- ord-3840a46b34724a9899b334733b818930
- Source dataset
- uspto-grants-1988_03
- Patent number
- US04729979
Reaction notes
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