Patent ID: 11857923
Assignee: LANZATECH, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 0:
1. A method of converting a carbonaceous feedstock to a syngas-fermentation product, said method comprising:
(a) introducing a carbonaceous feedstock and an oxidant to a gasifier, under suitable gasification conditions to produce a raw syngas stream comprising CO, H2, and CO2;
(b) optionally feeding at least a portion of said raw syngas stream to a syngas-cleanup unit, to produce an intermediate syngas stream;
(c) feeding at least a portion of said raw syngas stream and/or at least a portion of said intermediate syngas stream, if present, to an acid-gas removal unit, to remove at least some of said CO2 and produce a conditioned syngas stream;
(d) feeding at least a portion of said conditioned syngas stream to a fermentor, under suitable fermentation conditions and in the presence of suitable microorganisms and nutrients to biologically convert one or more of CO, H2, or CO2 to a fermentation product and generate a product stream comprising at least the fermentation product and a tail gas stream comprising at least CO2 and unconverted CO or H2;
(e) recycling at least a first portion of the tail gas to the fermentor, at least a second portion of the tail gas to the acid-gas removal unit, or both.