A method for recovering hydrocarbons with two multistage columns includes receiving a carbon dioxide recycle stream. The carbon dioxide recycle stream is separated in a first multistage column to produce a purified carbon dioxide recycle stream and a light hydrocarbon stream. The light hydrocarbon stream is separated in a second multistage column to produce a liquefied petroleum stream and a natural gas liquids stream. The first multistage column and the second multistage column are the only two multistage columns used in the method.

A method for recovering hydrocarbons with two multistage columns includes receiving a carbon dioxide recycle stream. The carbon dioxide recycle stream is separated in a first multistage column to produce a purified carbon dioxide recycle stream and a light hydrocarbon stream. The light hydrocarbon stream is separated in a second multistage column to produce a liquefied petroleum stream and a natural gas liquids stream. The first multistage column and the second multistage column are the only two multistage columns used in the method.

A combustion tool fuel cell is provided having enhanced low temperature operation, including a fuel composition comprising at least one hydrocarbon component with a total vapor pressure equal or above 95 psig at 21 C.

A combustion tool fuel cell is provided having enhanced low temperature operation, including a fuel composition comprising at least one hydrocarbon component with a total vapor pressure equal or above 95 psig at 21 C.

A system (102; 302) for recovering natural gas liquid from a low pressure gas source (110; 310), comprising a gas/gas heat exchanger (104; 304), fluid from the gas source flowing therethrough; at least one separator (108; 308) for receiving the fluid from the gas/gas heat exchanger (104; 304) and separating liquid from the gas, the gas being directed via a connecting pipe (116; 316) to the gas/gas heat exchanger (104; 304) where it cools the fluid from the gas source; characterised in that the connecting pipe (116; 316) includes expansion means (106; 322) for cooling the gas therein and liquid injection means (120; 320) for saturating the gas with liquid.

A system (102; 302) for recovering natural gas liquid from a low pressure gas source (110; 310), comprising a gas/gas heat exchanger (104; 304), fluid from the gas source flowing therethrough; at least one separator (108; 308) for receiving the fluid from the gas/gas heat exchanger (104; 304) and separating liquid from the gas, the gas being directed via a connecting pipe (116; 316) to the gas/gas heat exchanger (104; 304) where it cools the fluid from the gas source; characterised in that the connecting pipe (116; 316) includes expansion means (106; 322) for cooling the gas therein and liquid injection means (120; 320) for saturating the gas with liquid.

A system and method for curing or drying tobacco leaves are described herein. The method includes flowing a first combustion gas generated by a first heat source through a first flue pipe provided inside a first barn to heat air inside the first barn to cure a first batch of tobacco leaves disposed inside the first barn; transferring at least a portion of the first combustion gas generated by the first heat source to a second flue pipe provided inside a second barn adjacent the first barn to heat the second barn and start curing a second batch of tobacco leaves disposed inside the second barn; and flowing second combustion gas generated by a second heat source through the second flue pipe to continue curing the second batch of tobacco leaves after the second barn is heated.

The present invention provides a process for recovery of propylene and LPG from the fuel gas produced in FCC unit by contacting a heavier hydrocarbon feed with FCC catalyst. The process provides an energy efficient configuration for revamping an existing unit constrained on wet gas compressor capacity or for designing a new gas concentration unit to recover propylene and LPG recovery beyond 97 mole %. The process of the present invention provides an increase propylene and LPG recovery without loading wet gas compressor with marginal increase in liquid loads.

The present invention provides a process for recovery of propylene and LPG from the fuel gas produced in FCC unit by contacting a heavier hydrocarbon feed with FCC catalyst. The process provides an energy efficient configuration for revamping an existing unit constrained on wet gas compressor capacity or for designing a new gas concentration unit to recover propylene and LPG recovery beyond 97 mole %. The process of the present invention provides an increase propylene and LPG recovery without loading wet gas compressor with marginal increase in liquid loads.

Disclosed are methods and systems for removing a highly reactive polymer precursor such as carbonyls from a liquid hydrocarbon stream. Embodiments may disclose a method for removal of carbonyls from a liquid hydrocarbon stream comprising the steps of providing a liquid hydrocarbon stream containing carbonyls, providing a liquid bisulfite stream comprising an alkali metal bisulfite, and contacting the liquid hydrocarbon stream and the liquid bisulfite stream in a mass transfer device wherein at least a portion of the carbonyl reacts with the alkali metal bisulfite to form a solid adduct that is soluble in the bisulfite solution.