Two machines sit under the filtration separation umbrella, but they solve opposite problems. The Green Air Nitrogen Membrane Separator is the gas-separation route, pulling nitrogen out of compressed air for beverage, medical, industrial, and processor work. The TECHTONGDA Industrial Centrifuge Dehydrator is the solid-liquid route, spinning moisture and oil off machined parts, filings, and biomass. Choosing between them comes down to the phase you need to separate.
Quick verdict
If your goal is on-site nitrogen for a beverage or industrial gas setup, the Green Air Nitrogen Membrane Separator is the focused choice at USD 1,500. If your goal is drying and degreasing small hardware, metal filings, or biomass residue, the TECHTONGDA Industrial Centrifuge Dehydrator is the machine to consider at USD 4,646. They are not competing versions of the same tool-they are different answers to different filtration separation problems.
At a glance
| Product | Listed price | Condition |
|---|---|---|
| Nitrogen Membrane Separator Medical/Industrial/Processors/Beverage | USD 1,500.00 | Used |
| Industrial Centrifuge Dehydrator Biomass Oil Extraction Solid-Liquid Separator | USD 4,646.00 | New |
Where the nitrogen membrane separator wins
The Green Air unit is the only one of the two that handles gas separation. It is a dedicated membrane for producing nitrogen from compressed air, giving you nitrogen capability without the rotating-drum complexity of a centrifuge. If your application is beverage, medical, industrial, or processor-related, this component is the filtration separation route to focus on.
Where the industrial centrifuge dehydrator wins
The TECHTONGDA machine is the answer for liquid-heavy separation. It is built as a solid-liquid separator, with a 110 lb (50 kg) capacity and a semi-automatic foot switch for unloading. It suits dehydration and degreasing of small hardware, electronic parts, iron, aluminum, and copper filings, plus biomass oil extraction work.
Product notes
Green Air Nitrogen Membrane Separator Medical/Industrial/Processors/Beverage
This used Green Air unit focuses on one job: producing nitrogen from compressed air for medical, industrial, processor, or beverage applications. The membrane is 45 inches long, roughly 6-8 inches wide, weighs about 30 lbs, and carries a 200 PSI rating. It was previously attached to a Green Air compressor and served a high-demand draught beer system until that location closed. That history shows real beverage service, but it also means the part is sold as a membrane only-no compressor or tanks are included. If your separation task is about nitrogen gas and you can connect this membrane to an existing air supply, it is the specialized option in this pair. The limitation to keep in mind is that it is a used component, not a complete system.
Industrial Centrifuge Dehydrator Biomass Oil Extraction Solid-Liquid Separator
This TECHTONGDA centrifuge is the stainless-steel option in this pair. It has a 110 lb (50 kg) max capacity and a 660 r/min drum speed, with a semi-automatic foot switch for unloading. The 4HP (3KW) motor runs on 220V three-phase power. It is suited for grinding, cutting, and oil washing of metal parts, plus dehydration and degreasing of small hardware, electronic parts, and iron, aluminum, or copper filings. It also fits biomass oil extraction and general solid-liquid separation. The reason to go with this unit is the combination of capacity and stainless-steel construction. The main limitation is stated plainly: it cannot be used to dry clothes, and it requires 220V three-phase power.
Final choice by use case
- Buy the Green Air Nitrogen Membrane Separator when your filtration separation need is gas-based: beverage, medical, industrial, or processor work requiring nitrogen from compressed air. This is a 200 PSI-rated membrane separator rather than a complete system.
- Buy the TECHTONGDA Industrial Centrifuge Dehydrator when your filtration separation need is solid-liquid: metal parts, filings, biomass, or oil-extraction residue. This is a new, stainless-steel centrifuge built for that workload.
