Liquid absorption is a solvents recovery process specially suitable for AIR / GAS streams with high concentration of high boiling solvents. It is also suitable to recover chlorinated solvents if the concentration is sufficiently high.

DAMMER owns a very rich data bank to choose the best absorbent liquid for each solvent according to the activity coefficient of the solvent in the absorbent liquid and its most important properties.

Liquid absorption process consists mainly of two stages operation: absorption and stripping / distillation.

 

Stage 1 - ABSORPTION

The air / gas stream containing the solvents to be recovered, after filtration and cooling (if required) is fed by a fan to the bottom of absorption column filled with an high efficency and low pressure drop packing.
The absorbent liquid, fed in the top of the absorption column, flows through the packing absorbing the solvents quantitatively.
The purified air / gas stream leaves the top of the absorber whilst the absorbent liquid with the solvents is fed from the bottom to the stage 2.

Stage 2 - STRIPPING / DISTILLATION

In this stage occurs the separation, from the bottom of the stripping / distillation column, of the absorbent liquid free of solvents which is recycled back to the absorbent after cooling.
From the top of the stage 2 column the solvents are recovered by condensation and collected in a storage tank for further treament, if required.
Typical application is the recovery of Dimethylformamide (DMF) in pharmaceutical, polyurethane and acrylic industries