01The challenge
Why does oxygen purity depend on the molecular sieve?
The sieve is what separates nitrogen from oxygen: its N₂ capacity and N₂/O₂ selectivity set purity, output and power per ton of oxygen. Moisture that reaches the sieve steadily reduces capacity, so purity drifts down and the compressor or vacuum pump runs longer for the same output.
Our solution
- Grade: lithium LSX for high output and lower power in VPSA plants and medical concentrators; 13X (sodium X) for cost-sensitive PSA units; activated alumina bottom layer to dry the feed air.
- Regeneration: pressure or vacuum swing every cycle, no heating; typical sieve life 5–8 years when the feed air is kept dry.
- Outlet spec: oxygen purity 90–95% (typically 93% ± 3%) for medical, industrial and aquaculture use.
02Recommended grades
Which products does an oxygen unit need?
03On site
Installed in plants like yours
Lithium LSX or 13X — which do I need?
Lithium LSX gives the highest N₂/O₂ selectivity, so it produces more oxygen per kilogram and per kWh; 13X costs less and suits smaller or cost-sensitive PSA units.
What oxygen purity can PSA and VPSA reach?
Typically 90–95% oxygen; argon passes through with the oxygen, so purity above about 95% needs another process.
Why does oxygen purity drop over time?
Usually moisture: water adsorbed on the sieve blocks nitrogen sites. Check the dryer and alumina layer, and avoid bed movement that creates dust.
Can you supply sieve to refill my plant or concentrator?
Yes. Send the unit model or bed volume and current bead size, and we match the grade and loading quantity.
Refilling an oxygen plant or concentrator?
Send the unit model or bed volume, cycle type (PSA or VPSA) and target purity — we reply with a grade recommendation and quote within 24 hours.