Transport of organic vapors through poly(1-trimethylsilyl-1-propyne)

A process for treating a gas stream to remove or recover a condensable component. The process involves a condensation step followed by a membrane concentration step. The process is useful in treating raw gas streams containing low concentrations of the condensable component, in treating small-volume raw gas streams, as an alternative to processes that require multistage membrane separation systems, in treating raw gas streams that have the potential to form explosive mixtures, or in situations where the treated gas stream composition must meet narrow target specifications.

Process for removing condensable components from gas streams

A process for separating condensable organic components from gas streams (1). The process makes use of a membrane (2) made from a polymer material that is glassy and that has an unusually high free volume within the polymer material. Condensable organic components are removed as permeate stream (4), while a residue non-permeate stream is removed as stream (3).

Gas separation process

A system and a process for recovering high concentrations of methane from crude natural gas and solid waste landfill exhaust gas uses a sequential combination of a pressure swing adsorber unit operation to remove volatile organic compounds from the crude feed gas mixture followed by a membrane separation unit operation. The membrane separation uses a membrane which is selectively gas permeable to reject transmission of methane and thus to produce a permeate depleted in methane relative to the feed mixture. The permeate is also free of volatile organic compounds and is recycled to the pressure swing adsorber unit operation to regenerate saturated adsorbers.

Methane recovery process

An apparatus and method for maintaining a desired pressure within a fuel storage tank or tanks while minimizing or eliminating the amount of pollutants discharged from the fuel storage tank(s). A fuel storage tank is provided with a conduit and a chamber interfaced along the path of the conduit such that all fluid passing through the conduit must pass through the chamber. A fractionating membrane is housed within the chamber for capturing pollutants while allowing air to pass through. As pollutants are collected on the fractionating membrane, they permeate, thereby reducing the pressure in the tank and associated conduit. A vapor pump is provided for drawing vapor through the conduit and the membrane, and for drawing pollutants off of the membrane. A pressure transducer located in the tank or associated piping makes the vapor pump responsive to the pressure therein. A vent is further provided for allowing air into the tank and piping and for depressurizing the tank and piping. The apparatus of the present invention may be provided with a conduit for returning the pollutants to the fuel storage tank(s).

Fuel storage tank vent filter system

A method of removing organic compounds from an air/permanent gas mixture. This mixture, as untreated medium, is conveyed to a first gas separation membrane and is divided into a filtrate gas stream that is concentrated with organic compounds and a retained gas stream that is depleted of organic compounds. The concentrated filtrate is conveyed to a recovery device for the recovery of organic compounds therefrom. The pressure of the air/permanent gas mixture is raised prior to entry thereof into the first gas separation membrane. The pressure of the concentrated filtrate is reduced after exit thereof from the first gas separation membrane. The depleted gas stream is discharged into the atmosphere, and the gas stream that exits the recovery device is returned to the air/permanent gas mixture at some point subsequent to the pressure increase thereof.

Method of separating organic compounds from air/permanent gas mixtures

Process for separation of organism from mixture of air/permanent gas

Es wird ein Verfahren zum Austrag organischer Verbindun­gen aus Luft/Permanentgasgemischen vorgeschlagen, bei dem das Luft/Permanentgasgemisch (Rohmedium) auf eine erste Gastrennmembran geleitet und in einen mit organischen Verbindungen angereicherten (Permeat) und in einen abge­reicherten (Retentat) Gasstrom aufgetrennt wird, wobei aus dem uber eine Ruckgewinnungseinrichtung geleiteten angereicherten Gasstrom die organischen Verbindungen zu­ruckgewonnen werden. Dabei wird der Druck des primaren Luft/Permanentgasgemisches vor Eintritt in die erste Gas­trennmembran erhoht und der Druck des angereicherten Gas­stroms nach Austritt aus der ersten Gastrennmembran er­niedrigt und der die Gastrennmembran verlassende abgerei­cherte Gasstrom an die Umgebung abgegeben, wobei ein aus der Ruckgewinnungseinrichtung austretender Gasstrom er­neut dem Luft/Permanentgasgemisch zugefuhrt wird, nachdem dieses druckerhoht wurde.

Verfahren zum Austrag organischer Verbindungen aus Luft/Permanentgasgemischen

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Method of separating organic compounds from air/permanent gas mixtures

Process for separation of organism from mixture of air/permanent gas

Verfahren zum Austrag organischer Verbindungen aus Luft/Permanentgasgemischen