Method for collecting isoprene contained in fermented gas, and method for producing purified isoprene

Patent metadata

Field	Value
Publication number	US-10144683-B2
Application number	US-201514867179-A
Country	US
Kind code	B2
Filing date	Sep 28, 2015
Priority date	Mar 29, 2013
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Ajinomoto Kk

Inventors

• Rachi Hiroaki
• Watanabe Hiromoto
• Nishio Yosuke
• Takita Keiji
• Hioki Satoshi

Classifications

• C07C7/12 Primary

  by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with ion-exchangers · CPC title

• B01D2257/7022

  Aliphatic hydrocarbons · CPC title

• B01D2253/106

  Silica or silicates · CPC title

• C12P5/007

  containing one or more isoprene units, i.e. terpenes (carotenes C12P23/00) · CPC title

• C07C7/13

  by molecular-sieve technique · CPC title