Integrated biorefinery for production of liquid fuels
View Patent ↗A method and system for reforming a carbonaceous feedstock comprising the steps, reforming the feedstock produce a first synthesis gas, subjecting a portion of the first synthesis gas to catalytic conversion, separating from the synthesis gas conversion product at least one byproduct, and utilizing at least a portion of the at least one byproduct during reforming of additional carbonaceous material. In certain instances, the method and system may be used to produce a liquid fuel.
1. A method of producing synthesis gas conversion product, the method comprising:
reforming a carbonaceous feedstock comprising at least one carbonaceous material to produce a first synthesis gas comprising hydrogen, and carbon monoxide;
subjecting at least a portion of the first synthesis gas to catalytic conversion whereby at least a portion of the hydrogen and carbon monoxide therein is converted into synthesis gas conversion product;
separating from the synthesis gas conversion product a spent catalyst product comprising synthesis gas conversion product and catalyst that has been at least partially deactivated, attrited, or both during catalytic conversion; and
utilizing at least a portion of the spent catalyst product during reforming of additional carbonaceous material.
2. The method of claim 1 wherein the catalytic conversion comprises Fischer-Tropsch conversion of synthesis gas and wherein the synthesis gas conversion product comprises liquid hydrocarbons.
3. The method of claim 2 wherein the catalyst is selected from the group consisting of iron-based Fischer-Tropsch catalysts.
4. The method of claim 2 further comprising separating from the synthesis gas conversion product a wherein the byproduct comprises Fischer-Tropsch tailgas comprising at least one component selected from carbon monoxide, hydrogen, methane and carbon dioxide, and utilizing at least a portion of the Fischer-Tropsch tailgas during reforming of additional carbonaceous material.
5. The method of claim 4 wherein utilizing at least a portion of the Fischer-Tropsch tailgas during reforming of additional carbonaceous material comprises combusting at least a portion of the Fischer-Tropsch tailgas to provide heat for reforming additional carbonaceous material.
6. The method of claim 5 further comprising removing carbon dioxide from the Fischer-Tropsch tailgas.
7. The method of claim 2 wherein the spent catalyst product comprises liquid hydrocarbons and catalyst.
8. The method of claim 7 wherein utilizing at least a portion of the spent catalyst product during reforming of additional carbonaceous material comprises reforming at least a portion of the spent catalyst product with additional carbonaceous material.
9. The method of claim 1 further comprising preparing the carbonaceous feedstock by combining at least one carbonaceous material with superheated steam.
10. The method of claim 9 wherein the carbonaceous feedstock is prepared at a pressure of between about 5 psig (34.5 kPa) to 45 psig (310.3 kPa).
11. The method of claim 9 further comprising providing a desired molar ratio of hydrogen to carbon monoxide in the first synthesis gas by controlling at least one parameter selected from the group consisting of the weight ratio of the at least one carbonaceous material to the superheated steam, the moisture content of the at least one carbonaceous material, the reforming temperature, and the reforming pressure.
12. The method of claim 11 wherein the reforming temperature is in the range of from about 1700° F. (926° C.) to about 2200° F. (1204° C.).
13. The method of claim 11 wherein the catalytic conversion comprises Fischer-Tropsch conversion of synthesis gas, wherein the synthesis gas conversion product comprises liquid hydrocarbons and wherein the desired molar ratio is in the range of from about 0.5:1 to about 2:1.
14. The method of claim 13 wherein the desired molar ratio is about 1:1.
15. The method of claim 1 further comprising reducing the amount of at least one component selected from the group consisting of hydrogen, carbon monoxide, ash, tar, aromatics and carbon dioxide in the first synthesis gas.
16. The method of claim 1 wherein the catalytic conversion comprises conversion of synthesis gas into at least one component selected from the group consisting of alcohols and wherein the catalyst favors the production thereof.
17. The method of claim 1 wherein the carbonaceous feedstock comprises biomass.
18. The method of claim 1 further comprising producing superheated steam utilizing the heat of a flue gas produced during reforming, the heat of the first synthesis gas, or both.