Abstract: A system for separating a gas mixture is provided. The system includes a source of a gas mixture comprising methane, carbon dioxide, and water, a first membrane stage in fluid communication with the source, and a process gas drying unit including a membrane. The first membrane stage is designed to separate the gas mixture into a first retentate stream and a first permeate stream. The process gas drying unit is in fluid communication with the first permeate stream and creates a dehydrated gas stream from the first permeate stream. The system also includes a measuring device designed to measure a parameter of the dehydrated gas stream to determine a measured value, a valve in fluid communication with the process gas drying unit, and a controller in communication with the measuring device and the valve. The controller is designed to actuate the valve in response to the measured value.

Abstract: A system and a method for separating water from a gas mixture comprising carbon dioxide and water is provided. The system includes a source of a carbon dioxide-containing gas mixture, wherein the carbon dioxide-containing gas mixture comprises at least about 1 ppm by volume water vapor and a process gas drying unit comprising a membrane in fluid communication with the source of the carbon dioxide-containing gas mixture, the process gas drying unit designed to separate the water vapor from the carbon dioxide-containing gas mixture to generate a dehydrated gas from the carbon dioxide-containing gas mixture.

Abstract: A system for separating a gas mixture is provided. The system includes a source of a gas mixture and a membrane separation stage including a gas separation membrane module. The membrane separation stage is in fluid communication with the source of the gas mixture, and the gas separation membrane module is configured to separate the gas mixture into a retentate stream and a permeate stream. The gas separation membrane module also includes a membrane having a permeate side and a retentate side. A sweep stream is provided to the permeate side of the membrane, the sweep stream comprising a portion of the retentate stream.

Abstract: An apparatus for separating a gas mixture is provided in the form of a first membrane separation stage, a second membrane separation stage, a first and a second measuring device, and a controller. The first membrane separation stage is imparted with a first membrane area and separates the gas mixture into a first permeate stream and a first retentate stream. The second membrane separation stage is imparted with a second membrane area and is configured to separate the first permeate stream into a second permeate stream and a second retentate stream. The first and the second measuring devices are configured to measure process parameters and generate process control signals. Based on the process control signals, the controller modifies a membrane ratio defined with reference to the first membrane area and the second membrane area.

Abstract: An apparatus and process for separating a gas mixture is disclosed. The apparatus includes a plurality of membrane separation stages comprising a first membrane stage, a second membrane stage, and a third membrane stage. Each of the first, second, and third membrane stages are designed to separate a gas stream provided to them into a permeate stream and a retentate stream. The retentate stream provided from the third membrane stage is configured to be withdrawn as a product, further processed, or discarded. The apparatus further includes a gas transport device with an inlet in communication with the gas mixture and an outlet in communication with the first membrane stage. The controller is in communication with at least one measuring device, and the controller adapts a behavior of the gas transport device in response to a measurement of the at least one measuring device.

Abstract: An apparatus and process for separating a gas mixture is disclosed. The apparatus includes a first membrane stage, a second membrane stage, and a third membrane stage. The first membrane stage includes a first gas separation membrane configured to separate the gas mixture into a first retentate stream and a first permeate stream. The second membrane stage includes a second gas separation membrane configured to separate the first permeate stream into a second retentate stream and a second permeate stream. The second retentate stream of the second membrane stage is recycled back to connect with the first retentate stream to form a mixed fluid stream. The third membrane stage includes a third gas separation membrane configured to separate the mixed fluid stream into a third retentate stream and a third permeate stream, and the third retentate stream is configured to be withdrawn as a product or discarded.