Molecular Sieve Dehydration
Gas Dehydration Process Description
Molecular sieve dehydration process helps in drying natural gas by removing water from natural gas, prevents formation of gas hydrates and subsequent fouling of critical downstream components, reduces corrosion, maximizes pipeline and process efficiencies, and protects water sensitive catalysts in refinery processes. In desiccant operations, common adsorbent materials include molecular sieves, silica gels and activated alumina.
The wet hydrocarbon gas enters the top of the adsorption tower and flows downward through the adsorbent where the water is adsorbed. The essentially dry natural gas exits at the bottom and is ready for processing or sale. Most desiccant systems have two or more adsorption towers enabling one to be regenerated while the remaining tower(s) are in operation. Bed regeneration is accomplished by flowing heated dry gas upward so that contaminants adsorbed within the bed can be removed.
To maintain their effectiveness, desiccants must be protected from free water and liquid hydrocarbon contamination to achieve their anticipated 3 to 5 year life. Free water causes long term fracturing and dusting of the desiccant granules, while hydrocarbons burn onto the granules during regeneration, progressively reducing moisture removal capability.
Natural Gas Dehydration Plant Needs
- Achieve or exceed natural gas production quotas via reliable treatment of wet gases
- Maintain process reliability for consistency of production and minimization of downtime
- Provide consistent on-spec sales gas quality for water content
- Minimize desiccant bed degradation that can lead to premature water breakthrough
- Minimize pressure drop increase
Natural Gas Dehydration Challenge/Pall Solution
Improve your adsorbent dehydration productivity and reliability with effective liquid and solid removal upstream of the desiccant beds to protect against bed degradation and capacity loss.
Protect against introduction of traces or slugs of liquid by capturing the water upstream of the desiccant beds.
Protect downstream equipment, such as compressors and catalyst beds through effective solids control downstream of the desiccant beds.
Natural Gas Dehydration Unit Process Flow Diagram
Key Application/Filter Recommendations (other applications not shown)
|Application||Pall Products||Customer Benefits|
Desiccant bed protection
|Productivity, reliability, on-spec water content, and extended desiccant life via maintained dehydrator efficiency and capacity|
|Downstream process reliability by elimination of adsorbent dust|
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