Methods and systems for recovering alkene (e.g., C.sub.2-C.sub.4 alkene) gas as well as producing pressurized alkene (e.g., C.sub.2-C.sub.4 alkene) gas from process gas streams including higher concentrations of alkenes are provided herein.

Methods and systems for recovering alkenes (e.g. ethylene, propylene) from process gas streams, including multi-step condensing of the process gas stream, are provided herein.

Methods and systems for recovering alkene (e.g., C.sub.2-C.sub.4 alkene) gas as well as producing pressurized alkene (e.g., C.sub.2-C.sub.4 alkene) gas from process gas streams including lower concentrations of alkenes are provided herein.

Embodiments described herein provide methods and systems for separating a mixed ethane and CO.sub.2. A method described includes generating a liquid stream including ethane and CO.sub.2. The liquid stream is flashed to form an ethane vapor stream and solid CO.sub.2. The solid CO.sub.2 is accumulated in an accumulation vessel and the gas is removed from the top of the accumulation vessel.

Embodiments described herein provide methods and systems for separating a mixed ethane and CO.sub.2. A method described includes generating a liquid stream including ethane and CO.sub.2. The liquid stream is flashed to form an ethane vapor stream and solid CO.sub.2. The solid CO.sub.2 is accumulated in an accumulation vessel and the gas is removed from the top of the accumulation vessel.

Described is a particle filtration system that protects a gas segregation region from lunar regolith dust by using, among other filtration elements, an integrated electromagnetic and electrostatic dust repelling system. The system includes a particle intake chamber with a particle repelling screen comprising a planar array of conductive wires energized with phase-shifted alternating current to generate a time-varying magnetic field. This field repels iron-rich dust particles laterally. An ionizing element located between the particle repelling screen and the gas segregation region. The ionizing element generates one or more electron curtains that charge neutral dust particles, which are then drawn to paired conductive plates via electrostatic attraction. A final-stage ULPA mesh filter captures any remaining particles, ensuring only gas enters the gas segregation region. This design enhances dust mitigation, improves gas collection efficiency, and protects sensitive components in harsh extraterrestrial environments.

Disclosed is a segregating gas arrangement that generally comprises a gas segregation chamber, at least one cooling plate in the gas segregation chamber, and a carbon adsorber in an adsorption gas capturing chamber. The gas segregation chamber has a rim that when resting atop regolith defines a first interior environment. The cooling plates are in the gas segregation chamber, wherein the cooling plates are maintained at a first temperature above 5 K, which is a condensation temperature that higher temperature condensing gases will condense. The adsorption gas capturing chamber defines a second interior environment that is in communication with the first interior environment. The carbon adsorber is in the second interior environment and is maintained at a second temperature below 3 K. The carbon adsorber is configured to capture the low temperature condensing gas.