Comparison of different Vapor Recovery Systems
A quick glances at the various difference between Refrigeration, Absorption and Adsorption methods of recovery systems from volatile organic (VOC) streams.
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Refrigeration
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Absorption
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Adsorption
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| Application | Higher concentration | For low concentration-05% | For low concentration-0.5% |
| Process | Condensation | Separation and condensation | Separation and condensation |
| Operational Temp. | Very low temp. | Room and above | Room and above |
| Pressure drop | Very low | Low | High |
| Vacuum | Not required | Required | Required |
| Operations | Fully automatic/continuous | Full automatic/continuous | Automatic Batch process |
| Maintenance | Low maintenance | Low maintenance | High maintenance |
| Power cost | Power used when required | Continuous power even no load | Continuous power even at no load |
| Installation cost | Very Low | Low | Large |
| Concentration measurement | Not required | Required for outlet gas | Required for outlet gas |
| Space required | Smallest | Small | Large |
| Steam | Note required | Required | Required |
| Inert gas | Not required | Special circumstances | Required for safe operations |
| Carbon replacement | Not required | Not required | Required periodic replacement |
| Solvent replacement | Not required | Required | Not required |
| Safety | Intrinsically safe | Safe | Precautions required |
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