Methods for gasification of carbonaceous materials
View Patent ↗The present disclosure is generally directed to process of gasification of carbonaceous materials to produce synthesis gas or syngas. The present disclosure provides improved methods of gasification comprising: adding one or more carbonaceous materials, adding a molecular oxygen-containing gas, adding carbon dioxide gas and optionally adding water into said gasifier. This disclosure is also directed to process of production of one or more alcohols from said syngas via fermentation or digestion in the presence of at least one microorganism.
1. A method of gasification of carbonaceous materials in a gasifier to produce a product gas comprising carbon monoxide, hydrogen, and tar; comprising:
adding one or more carbonaceous materials, adding a molecular oxygen containing gas, adding carbon dioxide gas and optionally adding water into said gasifier; wherein
amount of total oxygen added to said gasifier in pounds per pound of total carbon added to said gasifier comprises greater than about 2.0 and less than about 3.0; wherein
the gasifier produces ash comprising ash-carbon and wherein said ash comprises less than about 10% of ash-carbon; wherein said product gas is treated at a temperature of about 1750° F. to about 3500° F. in the presence of molecular oxygen to produce a raw syngas comprising carbon monoxide, hydrogen, and syngas-carbon; wherein
said raw-syngas comprises less than about 0.5 pound syngas-carbon per 1000 SCF raw-syngas produced, wherein
said gasifier comprises non-catalytic gasification.
2. The method of claim 1 wherein one or more said carbonaceous materials comprises selection from carbonaceous material, carbonaceous liquid product, industrial carbonaceous liquid recycle, carbonaceous municipal solid waste (MSW), carbonaceous urban waste, carbonaceous agricultural material, carbonaceous forestry material, carbonaceous wood waste, carbonaceous construction material, carbonaceous vegetative material, carbonaceous petrochemical coproducts, carbonaceous coal, plastic, waste plastic, coke oven tar, fibersoft, tires, lignin, black liquor, polymers, waste polymers, polyethylene terephthalate (PETA), polystyrene (PS), sewage sludge, animal waste, crop residues, energy crops, forest processing residues, wood processing residues, livestock wastes, poultry wastes, food processing residues, fermentative process wastes, carbonaceous industrial waste, alcohol production wastes, ethanol coproducts, spent grains, spent microorganisms or their combinations.
3. The method of claim 1 wherein carbon content of one or more said carbonaceous materials comprises about 0.25 to about 1.0 pound per pound of one or more said carbonaceous materials on a water free basis.
4. The method of claim 1 wherein hydrogen content of one or more said carbonaceous materials comprises about 0.0 to about 0.25 pound per pound of one or more said carbonaceous materials on a water free basis.
5. The method of claim 1 wherein oxygen content of one or more said carbonaceous materials comprises about 0.0 to about 0.5 pound per pound of one or more said carbonaceous materials on a water free basis.
6. The method of claim 1 , wherein the carbon to hydrogen mass ratio in one or more of said carbonaceous material comprises 1 to 20.
7. The method of claim 1 , wherein the carbon to oxygen mass ratio in one or more of said carbonaceous material comprises 1 to 200.
8. The method of claim 1 , wherein the CO to CO2 ratio greater than 1.4.
9. The method of claim 1 , wherein the raw syngas volume ranges from 50387 to 86109 KSCF/DT.
10. A method of gasification of carbonaceous materials in a gasifier to produce syngas;
said gasifier comprising a first reaction zone and a second reaction zone;
said method comprising:
adding one or more carbonaceous materials into said first reaction zone of gasifier;
adding a molecular oxygen containing gas, carbon dioxide gas and optionally adding water or steam into one or both of said first reaction zone and second reaction zone of said gasifier; wherein
amount of total oxygen added to said gasifier in pounds per pound of total carbon added to said gasifier comprises greater than about 2.0 and less than about 3.0; wherein
said raw-syngas comprises less than about 0.5 pound syngas-carbon per 1000 SCF raw-syngas produced; wherein
said gasifier comprises non-catalytic gasification.
11. The method of claim 10 wherein said first reaction zone temperature comprises 650-1450.degree. F.
12. The method of claim 10 wherein said second reaction zone temperature comprises 1750-3500.degree. F.
13. The method of claim 10 comprising adding carbon dioxide gas into the first reaction zone of said gasifier.
14. The method of claim 10 further comprising: subjecting said raw syngas to cooling and cleaning up to produce a clean syngas; contacting said clean syngas with a biocatalyst in a fermentation container to produce an alcohol product mixture.
15. The method of claim 10 further comprising: subjecting said raw syngas to cooling and cleaning up to produce a clean syngas; contacting said clean syngas with a biocatalyst in a fermentation container to produce an alcohol product mixture.