Process studies have been conducted in a fluidized dense bed pilot plant and an adiabatic, fixed bed pilot plant. The program encompasses bench scale pilot plant studies, evaluation of product gasoline, and design of a 100 B/D pilot plant. The overall objective is to develop a practical and commercially viable process for the conversion of methanol to high octane gasoline. Work was initiated under this contract on January 20, 1975. The engineering design of a 100 BPD fixed bed pilot plant for the conversion of methanol to gasoline was completed. more ยป However, car tests with gasolines containing added durene have shown that concentrations up to 4 wt percent durene have no significant effects on vehicle performance. Durene concentrations are higher than in petroleum-derived fuels. Gasoline stability (i.e., potential gum formation) is acceptable at reasonable additive levels. The gasoline from this process has exceptional product qualities (i.e., high octane). The feasibility of converting methanol to gasoline in a fluid bed was demonstrated during an aging test of two months duration. A single reactor is used in the fluid bed process. The dehydration catalyst did not require any regeneration during the entire aging test. About 8000 lb methanol/lb conversion catalyst were processed, and catalyst performance was still satisfactory when the aging test was terminated. Over 200 days of successful operation were achieved during nine cycles (including regenerations of the Mobil conversion catalyst) in a fixed bed pilot plant. Methanol is partially dehydrated to an equilibrium mixture of methanol, dimethylether, and water over a dehydration catalyst in the first reactor, and both methanol and dimethylether are converted to high octane gasoline by a Mobil catalyst in the second reactor. Two reactors are used in the fixed bed process. Both fixed and fluid bed process concepts have been pursued. A novel process for the conversion of methanol to high octane gasoline has been successfully demonstrated in process development units (PDU).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |