Fischer-Tropsch catalyst activation procedure
A Fischer-Tropsch catalyst activation system including separation apparatus configured for separating a product gas comprising primarily hydrogen from a gas stream comprising hydrogen, an activation reactor fluidly connected with the separation apparatus via an activation gas inlet line whereby the product gas may be introduced into the activation reactor, and a circulation loop fluidly connecting a gas outlet of the activation reactor with the activation gas inlet line or with another gas inlet of the activation reactor and fluidly connecting the activation reactor with one or more apparatus configured for removal of H 2 O. A method of activating a Fischer-Tropsch catalyst is also provided.
1. A system for activating a Fischer-Tropsch catalyst, the system comprising:
a separation apparatus configured for separating a product gas comprising primarily hydrogen from a gas stream comprising hydrogen and at least one component selected from the group consisting of carbon monoxide and water vapor;
an activation reactor fluidly connected with the separation apparatus via an activation gas inlet line whereby the product gas may be introduced into the activation reactor;
a circulation loop fluidly connecting a gas outlet of the activation reactor with the activation gas inlet line or with another gas inlet of the activation reactor and fluidly connecting the activation reactor with one or more apparatus configured for removal of H 2 O;
a measurement device to measure the concentration of the at least one component of carbon monoxide or water vapor in the circulation loop; and
wherein, after initial pressurization, the circulation loop is configured to maintain the circulation as a closed loop system until the measured concentration of the at least one component, as measured by the measurement device, is below a desired concentration of either for carbon monoxide in a range of less than about 10 ppmv to less than about 0.1 ppmv or for water vapor a water concentration of less than about 100 ppmv and the circulation loop is configured to become open after the measured concentration of the at least one component is below the desired concentration.
2. The system of claim 1 , wherein the product gas comprises less than about 99.5 volume percent hydrogen.
3. The system of claim 1 , wherein the separation apparatus is configured to provide a product gas comprising less than about 99 volume percent hydrogen.
4. The system of claim 1 , wherein the activation reactor is a Fischer-Tropsch synthesis reactor or a dedicated activation reactor.
5. The system of claim 1 , wherein the one or more apparatus comprises a cooler and a gas/liquid separator, wherein the cooler is configured to cool a gas introduced therein via the circulation loop such that water condenses and wherein the gas/liquid separator is configured for removal of condensed water from a vapor fraction comprising hydrogen.
6. The system of claim 5 , wherein the cooler is configured to cool a gas introduced therein via the circulation loop to a temperature of less than about 4° C.
7. The system of claim 5 , further comprising at least one dryer located downstream of the gas/liquid separator along the circulation loop.
8. The system of claim 7 , further comprising a blower or compressor between the gas/liquid separator and the at least one dryer and configured to compress the vapor fraction comprising hydrogen prior to introduction thereof into the at least one dryer.
9. The system of claim 8 , wherein the dryer is selected from the group consisting of liquid absorbers and molecular sieves.
10. The system of claim 9 , comprising at least one molecular sieve capable of drying the gas within the dryer to dew points of less than or in the range of from about −20° F. to −30° F.
11. The system of claim 10 , wherein the molecular sieve is operable to reduce the water content of the gas within the dryer to less than 100 ppmv at 1 atmosphere.
12. The system of claim 1 , wherein the one or more apparatus comprises a dryer.
13. The system of claim 12 , further comprising a blower or compressor positioned upstream of the dryer along the circulation loop and configured to compress materials introduced thereto via the circulation loop.
14. The system of claim 12 , wherein the dryer is selected from the group consisting of liquid absorbers and molecular sieves.
15. The system of claim 14 , comprising at least one molecular sieve capable of drying the gas within the dryer to dew points of less than or in the range of from about −20° F. to −30° F.
16. The system of claim 15 , wherein the molecular sieve is operable to reduce the water content of the gas within the dryer to less than 100 ppmv at 1 atmosphere.
17. The system of claim 16 , wherein the molecular sieve is operable to reduce the water content of the gas within the dryer to less than 1 ppmv at 1 atmosphere.
18. The system of claim 1 , further comprising a purge line configured for removal of gas from the circulation loop.