Hydrogen and carbon utilization in synthetic fuels production plants
View Patent ↗A method of utilizing hydrogen in synthesis gas production by forming synthesis gas from one or more carbonaceous materials, the synthesis gas comprising hydrogen and carbon monoxide; separating a hydrogen-rich product and a hydrogen-lean product from the synthesis gas to yield an adjusted synthesis gas product; and activating a hydrocarbon synthesis catalyst with at least a portion of the hydrogen-lean product. A system for carrying out the method is also provided, the system including at least one hydrogen extraction unit and an activation reactor operable to activate hydrocarbon synthesis catalyst, wherein the activation reactor comprises an inlet fluidly connected with the at least one hydrogen extraction unit whereby at least a portion of a hydrogen-lean gas stream, at least a portion of a hydrogen-rich gas stream, or at least a portion of both may be introduced into the activation reactor.
1. A method of utilizing hydrogen in synthesis gas production, the method comprising:
a) forming synthesis gas from one or more carbonaceous materials, the synthesis gas comprising hydrogen and carbon monoxide;
b) separating a hydrogen-rich product and a hydrogen-lean product from the synthesis gas to yield an adjusted synthesis gas product; and
c) activating a hydrocarbon synthesis catalyst with at least a portion of the hydrogen-lean product wherein activating the catalyst comprises contacting the catalyst under activation conditions to at least a portion of the hydrogen-rich product and at least a portion of the adjusted synthesis gas product.
2. The method of claim 1 wherein activating the catalyst is performed in a hydrocarbon synthesis-catalyst activation unit.
3. The method of claim 2 wherein the hydrocarbon synthesis-activation unit is a hydrocarbon synthesis reactor or a dedicated catalyst activation reactor.
4. The method of claim 1 wherein activating the catalyst comprises activating fresh catalyst, re-activating used catalyst, or a combination thereof.
5. The method of claim 1 further comprising conveying the adjusted synthesis gas product to a hydrocarbon synthesis reactor to form liquid hydrocarbon product and a first gas byproduct stream, the first gas byproduct stream comprising hydrogen, carbon monoxide, and carbon dioxide.
6. The method of claim 5 further comprising directing at least a portion of liquid hydrocarbon product to one or more product upgrading units to form a synfuels product stream and a second gas byproduct stream.
7. The method of claim 5 wherein activating the catalyst comprises a plurality of steps in which hydrogen-rich product, hydrogen-lean product, adjusted synthesis gas product, first gas byproduct, second gas byproduct, or combinations thereof are utilized.
8. The method of claim 7 further comprising adjusting the activation gas, the temperature, the pressure, the activation gas addition sequence, the duration of activation, or a combination thereof during activation of the catalyst.
9. The method of claim 8 further comprising optimizing the plurality of steps to minimize chemical attrition of the catalyst during activation.
10. The method of claim 5 further comprising utilizing at least a portion of the second gas byproduct stream for activating the catalyst.
11. The method of claim 10 further comprising removing carbon dioxide from the first gas byproduct stream.
12. The method of claim 11 further comprising conveying the first gas byproduct stream to the hydrocarbon synthesis-catalyst activation unit.
13. The method of claim 1 further comprising refining the synthesis gas before (b) to remove at least one impurity.
14. The method of claim 1 wherein the one or more carbonaceous material is selected from coal, petroleum, biomass, pet coke, and combinations thereof.
15. The method of claim 1 wherein the hydrocarbon synthesis-catalyst activation unit comprises a plurality of reactors arranged in parallel, in series, or a combination thereof.
16. The method of claim 1 wherein the hydrocarbon synthesis-catalyst activation unit is operated at a temperature ranging from about 200° C. to about 400° C.
17. The method of claim 1 wherein the hydrocarbon synthesis-catalyst activation unit is operated at a pressure in the range of from about 15 psia to about 200 psia.
18. The method of claim 1 wherein the hydrogen-rich product comprises at least about 50% hydrogen by volume.
19. The method of claim 1 wherein the hydrogen-lean product comprises no more than about 50% hydrogen by volume.
20. The method of claim 1 wherein the hydrogen-rich product comprises a hydrogen to carbon monoxide ratio of at least about 10.
21. The method of claim 20 wherein the hydrogen-rich product comprises a hydrogen to carbon monoxide ratio of at least about 20.
22. The method of claim 1 wherein the hydrogen-lean stream comprises a hydrogen to carbon monoxide ratio no more than about 2.
23. The method of claim 22 wherein the hydrogen-lean stream comprises a hydrogen to carbon monoxide ratio no more than about 1.
24. The method of claim 1 wherein the catalyst comprises a metal selected from nickel, cobalt, iron, ruthenium, and combinations thereof.