Conversion of biomass feedstocks into hydrocarbon liquid transportation fuels
Methods for converting a carbon-containing feedstock into a fluid transportation fuel are described. The methods may include converting the carbon-containing feedstock into a producer gas comprising H 2 , CO, CO 2 , and N 2 , and reacting the producer gas with a substrate catalyst to produce a combination of Fischer-Tropsch (F-T) products, the F-T products including the fluid transportation fuel. A portion of the F-T products may be catalytically cracked to produce additional amounts of the fluid transportation fuel. A portion of the F-T products may also be hydrogenated to produce additional amounts of the fluid transportation fuel. Apparatuses are also described for converting a carbon-containing feedstock into a fluid transportation fuel. The apparatuses may include a producer gas reactor, a Fischer-Tropsch reactor, a cracking reactor, and a hydrogenation reactor.
1. An apparatus for converting a carbon-containing feedstock into a fluid transportation fuel, the apparatus comprising:
a producer gas reactor operable to convert the carbon-containing feedstock into a producer gas comprising H 2 , CO, CO 2 , and N 2 ; and
a Fischer-Tropsch reactor fluidly coupled to the producer gas reactor, wherein the Fischer-Tropsch reactor is operable to receive the producer gas comprising H 2 , CO, CO 2 , and N 2 and to convert a portion of the producer gas into a combination of Fischer-Tropsch (F-T) products, the F-T products including the fluid transportation fuel;
a cracking reactor fluidly coupled to the Fischer-Tropsch reactor, wherein the cracking reactor is operable to catalytically crack a portion of the F-T products to produce additional amounts of the fluid transportation fuel; and
a hydrogenation reactor fluidly coupled to the cracking reactor, wherein the hydrogenation reactor is operable to hydrogenate a portion of the F-T products to produce additional amounts of the fluid transportation fuel.
2. The apparatus of claim 1 , wherein the producer gas reactor is a biomass gasification reactor operable to convert biomass and air into the producer gas.
3. The apparatus of claim 2 , wherein the biomass is selected from the group consisting of woody biomass, non-woody biomass, a cellulosic product, cardboard, fiber board, paper, plastic, and a food stuff.
4. The apparatus of claim 1 , wherein the Fischer-Tropsch reactor comprises a cylindrical tube filled with a Fischer-Tropsch catalyst, wherein the tube has a diameter ranging from about 2 inches to about 3.5 inches.
5. The apparatus of claim 1 , wherein the Fischer-Tropsch reactor comprises a Fischer-Tropsch catalyst comprising iron.
6. The apparatus of claim 1 , wherein the Fischer-Tropsch reactor comprises as Fischer-Tropsch catalyst operable to catalyze a water-gas-shift reaction between H 2 O and CO to produce H 2 and CO 2 .
7. The apparatus of claim 1 , wherein the cracking reactor comprises a cracking catalyst comprising a zeolite that can catalytically crack waxes and aromatize light olefins.
8. The apparatus of claim 7 , wherein the zeolite comprises a ZSM-5 zeolite.
9. The apparatus of claim 1 , wherein the hydrogenation reactor comprises a hydrogenation catalyst comprising palladium.
10. The apparatus of claim 9 , wherein the hydrogenation catalyst comprises palladium on alumina.