According to certain embodiments of the invention, a gas containing at least 50% of carbon dioxide is cooled in a first exchanger so as to produce a cooled fluid, a liquid derived from the cooled fluid is sent to a distillation column to be separated therein, a head gas is withdrawn from the distillation column and reheated in the first exchanger, a vat liquid, which is richer in carbon dioxide than the gas containing at least 50% of carbon dioxide, is withdrawn and at least a portion thereof is heated in the first exchanger, at least a first portion of the vat liquid is vaporized in the first exchanger in order to produce a vaporized portion, the vaporized portion is sent back to the column and an NOx removal column is supplied with the liquefied cycle gas produced by vaporizing and reliquefying the vat liquid from the column.

An apparatus and method for flow management and CO.sub.2-recovery from a CO.sub.2 containing hydrocarbon flow stream, such as a post CO.sub.2-stimulation flowback stream. The apparatus including a flow control zone, a gas separation zone, a pretreatment zone, and a CO.sub.2-capture zone. The CO.sub.2-capture zone is in fluid communication with the pretreatment zone to provide CO.sub.2-capture from a pretreated flowback gas stream and output a captured CO.sub.2-flow stream. The CO.sub.2-capture zone includes a flow splitter to direct a first portion of the pretreated flowback gas stream to a CO.sub.2-enricher to provide an enriched CO.sub.2-stream for mixing with a second portion of the pretreated flowback gas to form a mixed stream. The CO.sub.2-capture zone further includes at least one condenser to output the captured CO.sub.2-flow stream.

The invention relates to a method for the treatment of natural gas containing carbon dioxide, methane and paraffins. The method comprising: a step of extracting the paraffins from the natural gas in a paraffin-removal column, and a step of separating the carbon dioxide and the methane in a distillation column. The operation of the two columns being provided by means of the thermal coupling of said two columns using a thermal coupling heat exchanger.

An apparatus and method for flow management and CO.sub.2-recovery from a CO.sub.2 containing hydrocarbon flow stream, such as a post CO.sub.2-stimulation flowback stream. The apparatus including a flow control zone, a gas separation zone, a pretreatment zone, and a CO.sub.2-capture zone. The CO.sub.2-capture zone is in fluid communication with the pretreatment zone to provide CO.sub.2-capture from a pretreated flowback gas stream and output a captured CO.sub.2-flow stream. The CO.sub.2-capture zone includes a flow splitter to direct a first portion of the pretreated flowback gas stream to a CO.sub.2-enricher to provide an enriched CO.sub.2-stream for mixing with a second portion of the pretreated flowback gas to form a mixed stream. The CO.sub.2-capture zone further includes at least one condenser to output the captured CO.sub.2-flow stream.

An apparatus for compressing air and producing a carbon dioxide-rich fluid includes an air compressor, an element for bringing the air bound for the air compressor into contact with water to produce humidified air and cooled water, a pipe for sending the humidified compressed air from the air compressor to an installation producing a carbon dioxide-rich gas, a carbon dioxide-rich gas compressor for compressing the carbon dioxide-rich gas, at least one heat exchanger upstream and/or downstream the carbon dioxide-rich gas compressor and pipes for conveying into the heat exchanger water cooled in the contact element and the carbon dioxide-rich gas.

A process and apparatus for liquefying a gas stream comprising hydrocarbons and sour species is provided in which the sour species are removed in liquefied form as the sweetened gas stream is progressively cooled to liquefaction temperatures. The process involves cooling the gas stream in a manner to produce a cooled gas stream comprising gaseous hydrocarbons and residual sour species. The cooled gas stream is then treated with a cold solvent to deplete the cooled gas stream of residual sour species. The resulting cooled sweetened gas stream is then further cooled to produce liquid hydrocarbons.

The disclosure includes a process for treating a natural gas containing carbon dioxide wherein the natural gas is separated by a cryogenic process in order to provide, on the one hand, a stream of liquid carbon dioxide, containing hydrocarbons, and, on the other hand, purified natural gas; at least one part of the natural gas is cooled in a first heat exchanger and then in a second heat exchanger before the cryogenic process and/or before a reflux to the cryogenic process; at least one part of the stream of liquid carbon dioxide is recovered in order to provide a stream of recycled carbon dioxide; the stream of recycled carbon dioxide is divided into a first portion and a second portion; the first portion is expanded and then heated in the first heat exchanger, in order to provide a first stream of heated carbon dioxide; the second portion is cooled, then at least one part of the second portion is expanded and then heated in the second heat exchanger, in order to provide a second stream of heated carbon dioxide; at least some of the hydrocarbons contained in the first stream of heated carbon dioxide and in the second stream of heated carbon dioxide are recovered by liquid/gas separation.

The present disclosure relates to systems and methods useful for providing one or more chemical compounds in a substantially pure form. In particular, the systems and methods can be configured for separation of carbon dioxide from a process stream, such as a process stream in a hydrogen production system. As such, the present disclosure can provide systems and method for production of hydrogen and/or carbon dioxide.

A liquid natural gas (LNG) reforming system of the present invention may include a reformer provided to receive LNG from an LNG tank; a CO2 PSA unit connected to the reformer and configured to extract carbon dioxide from off-gas generated from the reformer; a cooler connected to the CO2 PSA unit and configured to cool and liquefy the carbon dioxide extracted by the CO.sub.2 PSA unit using the LNG supplied from the LNG tank to the reformer; a storage tank connected to the cooler and provided to store liquid carbon dioxide of the cooler therein; and a circulation pump provided to pump the liquid carbon dioxide from the cooler into the storage tank and circulate a part of the liquid carbon oxide into the cooler.

A process for separating CO2 from a feed stream containing at least CO2 and at least one lighter component chosen among oxygen, nitrogen, argon, methane, CO and hydrogen and at least one component heavier than CO2, comprises cooling the feed stream in a heat exchanger (E1) to a temperature less than 30 C., separation of the cooled feed stream producing a first liquid enriched in CO2 and a first gas depleted in CO2, expanding at least part of the first liquid, producing a second liquid, vaporizing the second liquid in the heat exchanger (E1) producing a second gas, sending the compressed cooled second gas to the bottom of a scrubber column (K2) and removing a top gas of the scrubber column depleted in the at least one heavier component.