摘要:
A method for the recovery of hydrogen and one or more hydrocarbons having one or more carbon atoms from a feed gas containing hydrogen and the one or more hydrocarbons, which process comprises cooling and partially condensing the feed gas to provide a partially condensed feed; separating the partially condensed feed to provide a first liquid stream enriched in the one or more hydrocarbons and a first vapor stream enriched in hydrogen; further cooling and partially condensing the first vapor stream to provide an intermediate two-phase stream; and separating the intermediate two-phase stream to yield a further-enriched hydrogen stream and a hydrogen-depleted residual hydrocarbon stream. Some or all of the cooling is provided by indirect heat exchange with cold gas refrigerant generated in a closed-loop gas expander refrigeration cycle.
摘要:
A natural gas liquefaction system and process wherein excess refrigeration available in a typical natural gas liquefaction system is used to cool the inlet air to gas turbines in the system to thereby improve the overall efficiency of the system. A cooler is positioned in front of the air inlet of each gas turbine; and coolant (e.g. water) is flowed through each of the coolers to cool the ambient air as it flows into the gas turbines. The water, in turn, is cooled with propane taken from a refrigerant circuit in the system which, in turn, is used to initially cool the natural gas which is to be liquefied.
摘要:
C2 and C3 hydrocarbons, particularly ethylene and propylene, are recovered from refinery or petrochemical plant gas mixtures by cooling and fractionating a feed gas mixture containing these hydrocarbons and lighter components. Refrigeration for the process is provided by a closed-loop gas expander refrigeration process cycle which preferably uses nitrogen as the recirculating refrigerant. Cooling and fractionation may be effected in a dephlegmator.
摘要:
A process and apparatus for liquefying a natural gas, having a pressure above about 800 psig, in which the natural gas is introduced into an expander which operates to reduce the pressure of the natural gas and extract work from the expansion of the natural gas during the pressure reduction so that the resulting effluent from the expander can be cooled to sequentially lower temperatures by passing the gas through a plurality of cooling stages, in indirect heat exchange with at least one refrigerant, until the gas is substantially completely condensed in the last of the cooling stages.
摘要:
A cryogenic rectification system wherein condensed heat pump fluid is subcooled in the upper portion of an argon column, cools incoming feed, and is compressed and then condensed against cryogenic rectification plant bottoms for reboil thus improving reflux ratios and increasing argon recovery.
摘要:
The present invention relates to a cooling cycle which enables a gas to be liquefied as the result of the regasification of liquefied natural gas.In accordance with the invention, the cooling cycle consists of an incorporated cascade cycle the heat source for which is formed by liquefied natural gas in the course of regasification, and the cooling load for which is formed by gas to be liquefied.The invention is applicable to the production of liquid oxygen or nitrogen from a plant for separating air by liquefaction and distillation.
摘要:
The object of the present invention is to separate air at low power cost to produce high-pressure nitrogen gas and oxygen gas by utilizing cold of liquefied natural gas. Feed air is pre-purified and then introduced into a cryogenic separation unit, so that oxygen gas and nitrogen gas are separated. The nitrogen gas separated in the cryogenic separation unit is introduced into a second heat exchanger, and cooled by indirect heat exchange with a refrigerant. The nitrogen gas thus cooled is compressed in a low-temperature nitrogen compressor and supplied through a heater to an external plant for consumption. LNG is introduced into a first heat exchanger as a cold source. In the first heat exchanger, LNG cools and liquefies the refrigerant by indirect heat exchange. The liquefied refrigerant is sent to the second heat exchanger. The refrigerant is vaporized by indirect heat exchange with the nitrogen gas in the second heat exchanger. The vaporized refrigerant is returned to the first heat exchanger.
摘要:
Method for the liquefaction of a hydrocarbon-rich gas stream containing aromatic and heavy hydrocarbons, in particular a natural gas stream, where, prior to the liquefaction, a separation of the aromatic and the heavy hydrocarbons, in particular the C.sub.5+ hydrocarbons, comprisesa) a fraction (9, 11, 14) containing heavy hydrocarbons is admixed to the hydrocarbon-rich gas stream (1) to be liquefied,b) this mixed fraction (1, 2) is supplied to a separator (D),c) a gas fraction (3) freed of aromatic and heavy hydrocarbons is withdrawn from separator (D) and liquefied (E2), andd) a liquid fraction (5) enriched with aromatic and heavy hydrocarbons is withdrawn from separator (D).