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

Patent metadata

Field	Value
Publication number	US-2016016867-A1
Application number	US-201514867179-A
Country	US
Kind code	A1
Filing date	Sep 28, 2015
Priority date	Mar 29, 2013
Publication date	Jan 21, 2016
Grant date	—

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

1 . A method, comprising:
contacting a fermented gas comprising isoprene with a porous adsorbent; and desorbing isoprene adsorbed on the porous adsorbent; wherein the fermented gas is obtained by culturing a microorganism having an ability to produce isoprene.

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 porous adsorbent is a hydrophobidized porous adsorbent.

4 . The method according to claim 1 , wherein the porous adsorbent is a silica gel.

5 . The method according to claim 1 , wherein the porous adsorbent has an average pore size of 100 angstroms or less.

6 . The method according to claim 1 , wherein the microorganism having an ability to produce isoprene is a bacterium of the genus Pantoea.

7 . The method according to claim 1 , wherein desorbing isoprene adsorbed on the porous adsorbent comprises desorbing at a temperature of 100° C. or less.

8 . The method according to claim 1 , comprising performing a pressure swing adsorption method.

9 . The method according to claim 8 , 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.

10 . The method according to claim 8 , 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.

11 . The method according to claim 1 , comprising dehydrating the fermented gas before contacting the fermented gas with the porous adsorbent.

12 . The method according to claim 1 , comprising removing an organic substance from the fermented gas before contacting the fermented gas with the porous adsorbent.

13 . 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.

14 . 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.

15 . The method according to claim 14 , comprising recovering liquid isoprene by cooling the desorbed isoprene.

16 . The method according to claim 14 , wherein the porous adsorbent is a hydrophobidized porous adsorbent.

17 . The method according to claim 14 , wherein the porous adsorbent is a silica gel.

18 . The method according to claim 14 , wherein the porous adsorbent has an average pore size of 100 angstroms or less.

19 . The method according to claim 14 , wherein the microorganism having an ability to produce isoprene is a bacterium of the genus Pantoea.

20 . The method according to claim 14 , wherein desorbing isoprene adsorbed on the porous adsorbent comprises desorbing at a temperature of 100° C. or less.

21 . The method according to claim 14 , comprising performing a pressure swing adsorption method.

22 . The method according to claim 21 , 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.

23 . The method according to claim 21 , 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.

24 . The method according to claim 14 , comprising dehydrating the fermented gas before contacting the fermented gas with the porous adsorbent.

25 . The method according to claim 14 , comprising removing an organic substance from the fermented gas before contacting the fermented gas with the porous adsorbent.

26 . The method according to claim 14 , 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

• C07C7/13

  by molecular-sieve technique · CPC title

• B01D53/047

  Pressure swing adsorption · CPC title

• B01D2259/402

  using two beds · CPC title

• B01D2253/106

  Silica or silicates · CPC title

• C07C7/12 Primary

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