A system for processing an LNG feed, the system comprising: a bulk removal stage arranged to remove and release CO.sub.2 liquid from the inflow feed, said bulk removal stage including a first HGMT device, and; a polishing stage arranged to receive a lean CO.sub.2 feed from the first HGMT device, said polishing stage arranged to remove and release residual CO.sub.2, the polishing stage including a second HGMT device; wherein the polishing stage is arranged to release an outflow of CO.sub.2 stripped LNG.

Embodiments described herein provide a method and systems for separating carbon dioxide from heavy hydrocarbons. The method includes cooling a first liquid stream including carbon dioxide and heavy hydrocarbons within an oscillatory crystallization unit to generate carbon dioxide solids and a second liquid stream including the heavy hydrocarbons. The method also includes separating the carbon dioxide solids from the second liquid stream via a solid-liquid separation system.

The invention relates to a method for cooling, purifying and separating a gaseous mixture containing at least one impurity, in which the gaseous mixture is cooled to a temperature no higher than the temperature at which the at least one impurity solidifies in a heat exchanger having cooling passages, the cooling passages being at least partially covered with a coating and/or physically treated and/or chemically treated, the coating and/or the treatment serving to limit or even prevent the solidified impurity from forming and/or adhering to a surface of the passages; at least one portion of the solidified impurity exiting the cooling passages of the heat exchanger is collected; and the gaseous mixture is withdrawn from the heat exchanger.

A refining system for refining a feed gas (10) includes a first and a second component, the first component having a lower dew point temperature than the second component; the refining system including:an input section (105) for input of the feed gas including a dehydration unit for dehydrating the feed gas, capable of obtaining a water dew point between 45 and 65 C.;a pre-cooling section (110) coupled to the input section for receiving the dehydrated feed gas;a fractionation section (115) coupled to the pre-cooling section for receiving the pre-cooled stream;an expansion cooling and separation section (120) coupled to the fractionation section for receiving the fractionated gas, including a cyclonic separator device (240); the expansion cooling and separation section having an reflux conduit coupled to the fractionation section for reflux (24) of liquid enriched with the second component to the fractionation section.

A system and method for cooling a gas using a mixed refrigerant includes a compressor system and a heat exchange system, where the compressor system may include an interstage separation device or drum with no liquid outlet, a liquid outlet in fluid communication with a pump that pumps liquid forward to a high pressure separation device or a liquid outlet through which liquid flows to the heat exchanger to be subcooled. In the last situation, the subcooled liquid is expanded and combined with an expanded cold temperature stream, which is a cooled and expanded stream from the vapor side of a cold vapor separation device, and subcooled and expanded streams from liquid sides of the high pressure separation device and the cold vapor separation device, or combined with a stream formed from the subcooled streams from the liquid sides of the high pressure separation device and the cold vapor separation device after mixing and expansion, to form a primary refrigeration stream.

A method for removing entrained liquid droplets from a gas is provided. This method includes introducing a gas with entrained liquid droplets into a cyclone separator, thereby producing a gaseous portion and a liquid portion, wherein the gaseous portion exits the cyclone separator, and wherein the liquid portion is restricted by a liquid control valve and collected in a reservoir volume in the cyclone separator. The method also includes opening the liquid control valve upon receiving a signal from a liquid level sensor located in the reservoir volume, the liquid portion exits the cyclone separator and is introduced into a lock hopper. The method also provides a pressurized vapor stream to the lock hopper, thereby pressurizing the lock hopper, and then withdrawing a pressurized liquid stream from the lock hopper.

Methods and systems for separating components are disclosed. A process liquid stream is provided that contains a first component and a second component. The process liquid stream is cooled to near a temperature at which the second component forms a solid. The process liquid stream is expanded into a vessel such that the first component and a first portion of the second component vaporize to form a process vapor stream and a second portion of the second component forms a solid to form a solid product stream. The process vapor stream and the solid product stream are passed out of the vessel.

Two streams containing CO.sub.2 with different purities are separated in a common distillation column, without having been compressed or purified of water together.

Processes and systems are provided for treating the tail gas stream of a sulfur recovery plant. The process comprising the steps of treating the compressed tail gas stream in a pre-treatment unit to remove the impurities; separating the dry stream in a first stage membrane unit, the first stage membrane unit comprises a membrane selective to carbon dioxide and hydrogen; reducing a temperature of the cryogenic feed in a cryogenic cooler to produce a cryogenic stream; separating the cryogenic feed in a knock-drum to produce a liquid carbon dioxide and membrane feed; separating the membrane feed in a second stage membrane unit to produce a rubbery membrane permeate and a rubbery membrane retentate, where the second stage membrane unit comprises a membrane selective to carbon dioxide over hydrogen; and treating the rubbery membrane retentate in a hydrogen recovery process to produce a hydrogen product stream and a carbon dioxide lean stream.