• GAS DEHYDRATION

    MOLECULAR SIEVE DEHYDRATION

    Molecular Sieve Dehydration is a regenerative process through which water is adsorbed via contact with solid desiccant molecular sieves to bone dry concentrations in gas streams to prevent the formation of hydrates in cryogenic processing, or in liquid streams to meet product water specification.

3D DESIGN
GAS DEHYDRATION
LIQUID DEHYDRATION
TDE EXPERIENCE AND EXPERTISE

Gas Dehydration: 20 MMSCFD to 500 MMSCFD
Liquid Dehydration: 10,000 BPD to 60,000 BPD
Regeneration Rates: 1 MMSCFD to 40 MMSCFD

Engineering
Procurement
Fabrication
Construction and Installation
Commissioning
Operation, Maintenance and Troubleshooting

TDE's Molecular Sieve Designs draw from experience treating different gas or liquid streams of varying impurities. With minimal upfront overbuild TDE's dehydration unit considers and incorporates design aspects to prevent operational upsets and extend the life of the unit.

TDE offers either our Standard Pre-Engineered Modular Packages or Fully Customized Designs to meet varying project and schedule requirements.

PROCESS DESCRIPTION

Molecular sieve dehydration consists of an alternating cycle between an adsorption and a regeneration phase regulated by specialty switching valves. The inlet stream is filtered to remove contaminants and feeds the molecular sieve tower operating in adsorption mode where the molecular sieve desiccants adsorb water to its surface. The dehydrated gas can be treated for mercury removal prior to filtration before the gas continues to downstream units.

A slipstream of dehydrated gas is compressed and sent to the regeneration gas heater. Hot regeneration gas flows through the mole sieve bed to vapourize the adsorbed water and is then cooled and free water removed before being recycled for dehydration. After regeneration the bed is cooled with cool regeneration gas and returned to operating temperatures for use in the adsorption cycle.

DEHYDRATION DESIGN CONSIDERATIONS

Adsorption Cycle
• Consists of three zones: equilibrium, mass transfer, and active
• Optimized by bed breakthrough testing

Regeneration Cycle
• Heating ramp rate
• Filtration to prevent coke formation

Cooling Cycle and Standby Time
• Time to return bed back to operating temperatures
• Idle time between cycles provides operational flexibility

Molecular Sieve Selection
• Pore size selected based on impurities to be treated
• Angstrom range 3A, 4A, 5A, 13X

Contaminant Removal
• Regenerative and non-regenerative sacrificial beds
• Integration of a regenerative guard bed for contaminant removal with molecular sieve dehydrators

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