In gas sweetening and dehydration, the solvent does the work — amine removes acid gases, glycol removes water — but the solvent only stays effective if it is kept clean. Contaminated amine and glycol cause foaming, fouling, corrosion, and solvent loss, problems that quietly erode the performance and reliability of a gas treatment plant. The equipment that keeps the solvent clean is the filtration skid. This guide explains the role of amine and glycol filtration skids in the gas sweetening and dehydration loops.

For the wider context of how these packages are built, see our overview of industrial skid systems.

Both amine sweetening and glycol dehydration work by circulating a solvent in a continuous loop — absorbing the target component, then regenerating and reusing the solvent. Over time that circulating solvent picks up contaminants: solid particulates, hydrocarbons, degradation products, and dissolved iron. Left unchecked, these contaminants build up and cause operating problems. Filtration skids continuously clean a portion of the circulating solvent, keeping contamination under control and the loop running reliably.

Poorly filtered amine or glycol leads to a familiar set of problems:

• Foaming: Contaminants such as hydrocarbons and fine solids promote foaming in the contactor, which reduces treating capacity, causes solvent carryover, and can disrupt the whole process.
• Fouling: Particulates and degradation products foul heat exchangers and trays, reducing efficiency and increasing maintenance.
• Corrosion: Solids and certain degradation products accelerate corrosion in the loop, shortening equipment life.
• Solvent loss: Foaming and carryover waste expensive amine or glycol, adding to operating cost.

Effective filtration prevents these issues, protecting both performance and the solvent itself.

A typical solvent filtration skid uses more than one stage to remove different contaminant types:

1. Mechanical (particle) filtration: Cartridge or bag filters remove solid particulates such as iron sulfide and other fines from the solvent.
2. Carbon filtration: An activated carbon bed adsorbs dissolved hydrocarbons, surfactants, and degradation products that cause foaming.
3. After-filtration: A final particle filter captures any carbon fines carried over from the carbon bed, protecting the loop downstream.

This full-flow or slipstream arrangement continuously polishes the solvent, and the skid integrates the filter vessels, piping, valves, and instrumentation as one tested package.

Solvent filtration combines several filter stages that must be sized and sequenced correctly, which makes it well suited to skid packaging. A skid-mounted unit is engineered and tested as a complete system, so it installs quickly and integrates cleanly into the amine or glycol loop. The compact footprint suits gas processing facilities, and the package can be designed for full-flow or slipstream service depending on the loop. Factory assembly and testing ensure the filtration train performs as intended before delivery.

Filtration skids are an integral part of gas sweetening and dehydration trains, protecting the solvent in amine sweetening units and glycol dehydration units. Ergil supplies dedicated amine filtration packages and glycol filtration skids as part of its gas treatment and conditioning skids. See our full gas processing systems range.

Circulating solvent accumulates particulates, hydrocarbons, and degradation products that cause foaming, fouling, corrosion, and solvent loss. Filtration removes these contaminants to keep the sweetening or dehydration loop running reliably.

The activated carbon bed adsorbs dissolved hydrocarbons and surfactants that cause foaming — contaminants that particle filters cannot remove. It is usually followed by an after-filter to catch carbon fines.

Full-flow filtration treats the entire solvent circulation, while slipstream filtration treats a portion of it. The choice depends on the loop, contamination level, and design requirements.