Fuels oxygenated fuel

Oxidizer Fuel Oxygen-fuel ratio by weight for maximum Bnlk specific gravity Theoretical 7 3... 

Isobutyl alcohol [78-83-1] forms a substantial fraction of the butanols produced by higher alcohol synthesis over modified copper—zinc oxide-based catalysts. Conceivably, separation of this alcohol and dehydration affords an alternative route to isobutjiene [115-11 -7] for methyl /-butyl ether [1624-04-4] (MTBE) production. MTBE is a rapidly growing constituent of reformulated gasoline, but its growth is likely to be limited by available suppHes of isobutylene. Thus higher alcohol synthesis provides a process capable of supplying all of the raw materials required for manufacture of this key fuel oxygenate (24) (see Ethers). 

The Energy PoHcy Act of 1992 (H.R. 776) has Hberalized the rules concerning biofuels and provides tax incentives for increased usage. Many states also have gasohol fuel tax exemptions in place, and some have enacted legislation that requites use of oxygenated fuels under certain conditions. Most of these laws impact favorably on biofuels usage. 

J. T. Brown, "100% Oxygen - Fuel Combustion for Glass Furnaces," 51st Conference on Glass Problems, Amer. Ceram. Soc., Columbus, Ohio, Nov. 

Some isopentane is dehydrogenated to isoamylene and converted, by processes analogous to those which produce methyl /-butyl ether [1634-04-4] (MTBE) to /-amyl methyl ether [994-05-8] (TAME), which is used as a fuel octane enhancer like MTBE. The amount of TAME which the market can absorb depends mostly on its price relative to MTBE, ethyl /-butyl ether [637-92-3] (ETBE), and ethanol, the other important oxygenated fuel additives. 

High temperature steam reforming of natural gas accounts for 97% of the hydrogen used for ammonia synthesis in the United States. Hydrogen requirement for ammonia synthesis is about 336 m /t of ammonia produced for a typical 1000 t/d ammonia plant. The near-term demand for ammonia remains stagnant. Methanol production requires 560 m of hydrogen for each ton produced, based on a 2500-t/d methanol plant. Methanol demand is expected to increase in response to an increased use of the fuel—oxygenate methyl /-butyl ether (MTBE). 

World methanol consumption for 1992 is shown in Figure 10 (27). The principal use of methanol has traditionally been in the production of formaldehyde [50-00-0] where typically around 40% of the world methanol market is consumed. In the United States, an increasing role for methanol has been found in the oxygenated fuels market from the use of MTBE. Another significant use of methanol is in the production of acetic acid other uses include the production of solvents and chemical intermediates. 

The 1990 Clean Air Act mandates for blended oxygenates ia gasoline created a potentially large new use for DIPE as a fuel oxygenate. Isopropyl alcohol can react with propylene over acidic ion-exchange (qv) catalysts at low temperatures, which favor high equiUbrium conversions per pass to produce DIPE (34). 

Fig. 28. Cycle of 34-ceU regenerative hydrogen—oxygen fuel cell where A represents the charging region at 10 A, B represents discharging at 18.2 A. Both (—) voltage and (—) pressure changes are shown. To convert MPa to psig, multiply by 145.

E. Findl and M. Klein, "Electrolytic Hydrogen—Oxygen Fuel, CeU Battery," Proceedings of the 20th Power Sources Conference, Red Bank, N.J., 1966. 

Flammability Limits There are both upper (or rich) and lower (or lean) limits of flammability of fuel-air or fuel-oxygen mixtures. Outside these hmits, a self-sustaining flame cannot form. Flammability limits for common fuels are listea in Table 27-18. 

Oxygen/fuel at stoiehiometrie) (Oxygen/fuel at aetual eondition)... 

Experimental data are available for detonation limits for a limited number of fuel-air and fuel-oxygen mixtures at atmospheric pressure in both confined and nnconfined situations. These are presented in Table 4-4 (Nettleton 1987). 

Matsui, H., and J. H. S. Lee. 1979. On the measure of relative detonation hazards of gaseous fuel-oxygen and air mixtures. Seventeenth Symposium (International) on Combustion, pp. 1269-1280. Pittsburgh, PA The Combustion Institute. 

Demand for gasoline is 125 billion gals (473 billion 1) per year according to 1998 estimates. The Clean Air Act Amendment of 1990 mandates the use of oxygenated fuels such as ethanol blends with up to 3.5 percent oxygen by weight in gasoline (E-10 or... 

---