Method for collecting isoprene contained in fermented gas, and method for producing purified isoprene
Methods include contacting a fermented gas including isoprene with a porous adsorbent and desorbing isoprene adsorbed on the porous adsorbent. The fermented gas may be obtained by culturing a microorganism having an ability to produce isoprene.
1. A method, comprising:
contacting a fermented gas comprising isoprene with a porous adsorbent; and
desorbing isoprene adsorbed on the porous adsorbent at a temperature of 80° C. or less;
wherein:
the fermented gas is obtained by culturing a microorganism having an ability to produce isoprene;
desorbing isoprene comprises desorbing isoprene gas; and
the porous adsorbent is a hydrophobidized silica gel with an average pore size of 60 Angstroms or less.
2. The method according to claim 1 , comprising recovering liquid isoprene by cooling the desorbed isoprene.
3. The method according to claim 1 , wherein the microorganism having an ability to produce isoprene is a bacterium of the genus Pantoea.
4. The method according to claim 1 , wherein desorbing isoprene adsorbed on the porous adsorbent comprises desorbing at a temperature of 60° C. or less.
5. The method according to claim 1 , comprising performing a pressure swing adsorption method.
6. The method according to claim 5 , wherein:
contacting the fermented gas with the porous adsorbent comprises contacting at a pressure (PI-1);
desorbing isoprene adsorbed on the porous adsorbent comprises desorbing at a pressure (PI-2); and
the pressures PI-1 and PI-2 satisfy PI-1-PI-2>50 kPa.
7. The method according to claim 5 , comprising, in sequence:
contacting the fermented gas with the porous adsorbent;
desorbing isoprene adsorbed on the porous adsorbent;
again contacting the fermented gas with the porous adsorbent; and
again desorbing isoprene adsorbed on the porous adsorbent.
8. The method according to claim 1 , comprising dehydrating the fermented gas before contacting the fermented gas with the porous adsorbent.
9. The method according to claim 1 , comprising removing an organic substance from the fermented gas before contacting the fermented gas with the porous adsorbent.
10. The method according to claim 1 , further comprising, after contacting the fermented gas with the porous adsorbent, discharging fermented gas having an isoprene concentration of 0.8 C0 or less;
wherein C0 is an isoprene concentration of the fermented gas contacted with the porous adsorbent.
11. A method, comprising:
culturing a microorganism having an ability to produce isoprene to obtain a fermented gas comprising isoprene;
contacting the fermented gas comprising isoprene with a porous adsorbent; and
desorbing isoprene adsorbed on the porous adsorbent at a temperature of 80° C. or less;
wherein:
desorbing isoprene comprises desorbing isoprene gas, and
the porous adsorbent is a hydrophobidized silica gel with an average pore size of 60 Angstroms or less.
12. The method according to claim 11 , comprising recovering liquid isoprene by cooling the desorbed isoprene.
13. The method according to claim 11 , wherein the microorganism having an ability to produce isoprene is a bacterium of the genus Pantoea.
14. The method according to claim 11 , wherein desorbing isoprene adsorbed on the porous adsorbent comprises desorbing at a temperature of 60° C. or less.
15. The method according to claim 11 , comprising performing a pressure swing adsorption method.
16. The method according to claim 15 , wherein:
contacting the fermented gas with the porous adsorbent comprises contacting at a pressure (PI-1);
desorbing isoprene adsorbed on the porous adsorbent comprises desorbing at a pressure (PI-2); and
the pressures PI-1 and PI-2 satisfy PI-1-PI-2>50 kPa.
17. The method according to claim 15 , comprising, in sequence:
contacting the fermented gas with the porous adsorbent;
desorbing isoprene adsorbed on the porous adsorbent;
again contacting the fermented gas with the porous adsorbent; and
again desorbing isoprene adsorbed on the porous adsorbent.
18. The method according to claim 11 , comprising dehydrating the fermented gas before contacting the fermented gas with the porous adsorbent.
19. The method according to claim 11 , comprising removing an organic substance from the fermented gas before contacting the fermented gas with the porous adsorbent.
20. The method according to claim 11 , further comprising, after contacting the fermented gas with the porous adsorbent, discharging fermented gas having an isoprene concentration of 0.8 C0 or less;
wherein C0 is an isoprene concentration of the fermented gas contacted with the porous adsorbent.