Abstract: Impure carbon dioxide (“CO2”) comprising a first contaminant selected from the group consisting of oxygen (“O2”) and carbon monoxide (“CO”) is purified by separating expanded impure carbon dioxide liquid in a mass transfer separation column system. The impure carbon dioxide may be derived from, for example, flue gas from an oxyfuel combustion process or waste gas from a hydrogen (“H2”) PSA system.

Abstract: The present invention is an enhancement of the prior art use of partial effects and component distribution regarding NGL fractionation, especially relating to the separation of propane, isobutane, normal butane and gasoline components. The present invention distributes butanes in two separate columns and integrates the thermodynamic efficiency obtained with partial effects to cascade reboiling duty through as many as four separate columns. The resulting savings in energy are compared with the prior art process of sequential fractionation of NGL.

Abstract: A process and apparatus are provided for recovering volatile liquid vapors from an air-volatile liquid vapor mixture. The process includes: (1) cooling the mixture to condense volatile liquid vapors and moisture; (2) collecting the condensed volatile liquid vapors and moisture; (3) circulating the cooled and dehumidified mixture through a bed of adsorbent; and (4) desorbing and recovering the volatile liquids from the bed. The apparatus includes a refrigeration unit, a cooler for cooling the mixture, two reaction vessels each including a bed of adsorbent, a pump, an absorber tower and a valve and conduit system for circulating the mixture through the various components of the apparatus. Heat may be recovered from the refrigerant and used to heat the bed during desorption.

Abstract: A process and apparatus are provided for recovering volatile vapors from an air-volatile mixture. The process includes cooling the mixture to condense volatile liquid vapors and moisture, collecting the condensed volatile liquid vapors and moisture, circulating the cooled and dehumidified mixture through a bed of adsorbent, and desorbing and recovering the volatile liquids from the bed. The apparatus includes a refrigeration unit (24), a cooler (20) for cooling the mixture, two reaction vessels (36, 36') each including a bed of adsorbent (38, 38'), a pump (50), an absorber tower (72) and a valve and conduit system for circulating the mixture through the various components of the apparatus. Heat may be recovered from the refrigerant and used to heat the bed during desorption.