Patent ID: 9518237
Filing Date: 2016-12-13
CPC Classification: C10G,C10J,C10K,C12P,Y02E,Y02P

Claim Text:
1. A process for generating a syngas comprising: (a) continuously gasifying carbonaceous feedstock at a temperature in excess of about 1000° C. to provide a syngas stream containing hydrogen sulfide, carbonyl sulfide, methane, ethylene, acetylene, benzene, toluene, xylene, tars including naphthalene, ammonia, and hydrogen cyanide; (b) cooling the syngas stream to a temperature below the temperature at which uncatalyzed water gas shift reactions occur; (c) scrubbing the syngas, said scrubbing by contact with a first aqueous medium at a temperature that is a sufficiently high temperature such that less than 40 percent of the ammonia contained in the syngas is absorbed by the aqueous medium and a pressure sufficient to provide aqueous medium in the liquid phase to provide a scrubbed syngas and an aqueous medium containing tars, wherein the contacting is for a duration sufficient such that the scrubbed syngas contains less than about 5 ppm(mole) naphthalene; (d) contacting the aqueous medium containing tars with stripping gas under stripping conditions sufficient to remove tars from the aqueous medium and provide a lean aqueous medium containing tars and a gas containing tars; and (e) introducing at least a portion of the lean aqueous medium into the syngas stream of step (b) to cool the syngas by latent heat of vaporization.