Biological production of ethanol from waste gases

Device for biological production of ethanol from waste gases includes a bioreactor such as a plurality of tunnels each having inlet and outlet passageways, a gasifier reactor creates a continuous source of syngas from waste gases to the upper portion of each tunnel. A mixing device provides a continuous supply of fermentation microbes in a liquid directed by pumps and spray misters to the tunnel. Pumps direct the liquid for conversion of the syngas to ethanol.


To view all patent detail click here





1. Field of the Invention

This current invention is directed towards enhancing a process utilizing a continuous gaseous waste stream (syngas) via a tube fermentation tube or system bioreactor under anaerobic conditions.

2. Relevant Art

Previous strategies and art of waste gas fermentation included tanks or tower constructions containing the fermentation medium like a Continuously Stirred Reactor (CSTR) and Immobilized Mobile Reactor (ICR). Most demonstrated tanks in the art have been ofthe Continuously Stirred Reactor (CSTR) form and maintain the incoming syngas in way longer to stop large bubble formation since syngas would co-mingle to a bigger a bigger bubble as it ascended to the surface without agitation. Previous artneeded to possess the syngas pressurized to 3 atmospheres (42 lbs) for it to be pumped against the power of 20-30 feet of water remedy. When the syngas has surfaced there’s isn’t any longer any contact with the ethanol producing microbes along with the exposed syngasmust be split for its unused components or combusted to make electricity. The present invention allows for the syngas, chiefly composed of CO, CO.sub.2 and also H.sub.2, to slowly meander at very low pressures (less than 5 pounds psi) via a tunnel.

Contact the anaerobic bacterium Clostridium Ijungdahlii or mixture of microbes using the meandering syngas have to be accomplished by pumping the microbial aqueous medium and allowing touch above the aqueous medium surface degree.

Previous methods from the art of ethanol production from carbon black waste gasoline have all been in a continuous stirred bioreactor.

Carbon black waste gases are generated as the result of partial oxidation of hydrocarbons with inadequate air to form amorphous carbon, with about 1.2 lbs of carbon dioxide generated a pound of elemental carbon. These waste gases kind aserious atmospheric contamination issue but also represent a valuable chemical feedstock resource not presently being recovered.

Complex methods in the artwork have contained carbon black waste gas containing about 14% CO, 17 percent H.sub.2, 4 percent CO.sub.2 and its important component N.sub.2 and is agitated by compressed air into a continuous stirred tank reactor and maintained at 37degrees C., also comprises Clostridium Ijungdahlii isolate ER12 ATCC residue 55380. The gas retention period is maintained at 0.52 min. The aqueous liquid medium containing water, base salts, B-vitamins, a nitrogen source and a sulfide supply is fed intothe reactor at a liquid dilution rate (defined as the ratio of the liquid flow rate to reactor volume) of 1.05 hr.sup.-1. The agitation rate of this reactor is 322 rpm, the temperature is 37 degrees C. and the operating pH is 5.03. Under theseconditions, the conversion of CO was 83% and the conversion of H.sub.2 was 54 percent.

Maximum gas retention times in (CSTR) models using agitation were at the assortment of 3 minutes and 1000 rpm on the bench scale model. The gas retrieval varies with its uptake by the bacteria, which was in turn a function of the mobile density.See U.S. Patent Program, J. L. Gaddy, Pub. No. US 2003/0211585 A1, Nov.. 13, 2003.

There remains a need in the art of fermentation of industrial gaseous substrates also known as syngas for a better handling system to permit optimal exposure of syngas for its production of ethanol.

IP reviewed by Plant-Grow agriculture technology news