Patent ID: 9126841
Filing Date: 2015-09-08
Classification: C01B,C01C,F25J,Y02P

Abstract:
1. An ammonia plant comprising: a raw syngas expander that is configured to receive and expand a raw syngas; a cryogenic rectifier that is configured to receive the expanded raw syngas and to produce a bottom product at a bottom product pressure and to further produce a processed syngas overhead product; an expansion device that is fluidly coupled to the cryogenic rectifier and that is configured to receive the bottom product at a first pressure and to expand the bottom product from the first pressure to a second pressure to thereby provide refrigeration cold to an overhead condenser of the cryogenic rectifier; and (a) a compressor downstream of the expansion device and fluidly coupled to the expansion device to receive expanded bottom product when the first pressure is the bottom product pressure, such that the bottom product of the cryogenic rectifier flows directly from the rectifier to the expansion device and directly from the expansion device to the compressor that compresses the expanded bottom product from the second pressure to a higher pressure, or (b) a pump upstream of the expansion device and fluidly coupled to the expansion device to receive the bottom product when the pump compresses the bottom product from the bottom product pressure to the first pressure, such that the bottom product of the cryogenic rectifier flows directly from the rectifier to the pump and directly from the pump to the expansion device; and wherein the pump or compressor is operationally coupled to the raw syngas expander such that energy expended in the pump or compressor is produced by the raw syngas expander, and wherein a pressure differential between the first and second pressure is sufficient to increase the refrigeration cold in the overhead condenser.