helium purification helium recovery membrane oxygen generation flat membrane oxygen generation vehicle-mounted oxygen generation vehicle-mounted nitrogen generation membrane nitrogen generation membrane separati syngas hydrogen-to-carbon ratio carbon monoxide purification methane purification membrane CH4 unit ammonia synthesis vent gas solution high-pressure vent gas hydrogen recovery hydrogen separation helium extraction membrane helium unit natural gas dehydration membrane gas dehydration membrane CO₂ removal membrane oxygen enrichment air purification fresh air conditioner efficient cooling car air conditioner respiratory support oxygen inhaler oxygen delivery portable oxygen inhalation fish transportation oxygen-enriched aquaculture natural gas processing helium extraction membrane nitrogen enrichment silicone production silicone industry glycol production ethylene glycol industry polyethylene industry PVC industry polyvinyl chloride industry polymer production polypropylene industry vapor recovery equipment oil depot vapor recovery high-quality combustio oxygen-enriched combustion high-quality nitrogen membrane nitrogen generator high-quality n vehicle-mounted nitrogen generator refinery gas metal treatment nitrogen metal annealing synthetic ammonia tail gas hydrogen recovery gas processing coke oven gas extraction natural gas purification CO₂ removal oil and gas recovery gas station recovery carbon dioxide capture CO₂ recovery grains preservation nitrogen storage beer beverages nitrogen-filled storage membrane bioreactor MBR membranes electrodialysis membranes RO membranes reverse osmosis membranes metal membranes ion separation nanofiltration membranes ceramic membranes microfiltration membranes aerated biofilm reactor MABR membrane ultrafiltration membrane high-quality separation electrodialysis membrane laboratory testing electrodialysis equipment RO membrane tubular membrane NF membrane nanofiltration membrane filtration equipment experimental equipment ceramic membrane carbon dioxide removal membrane-based CO₂ capture high-quality sep membrane distillation components particle separation microfiltration membrane