Glycerine

Spent lyes treatment

Many of our plants operate without chemical treatment of the sweet water, matter of fact De Smet  was the first to operate in this way since 1989; nevertheless we can supply a fully continuous treatment whereas required.

Chemical treatment of spent lyes, on the contrary of sweet water, is unavoidable and is carried out in a continuous, fully automatically controlled unit.

The same applies for methylesters.

Spent lyes concentratrion

The unit is tailored to the capacity, the available utilities and the specific customer preferences in up to four effects. Both natural and forced circulation units are supplied.

Maximum heat recovery is achieved by feed effluent heat exchangers and thermo compressors.

For spent lyes concentration, the unit differs from the one for sweet water for the salt separation recovery and drying section. Also the materials of construction are different from the ones for sweet water. Due to the presence of salt only the forced circulation alternative is viable.

This unit can also handle, when required, bio-diesel diluted glycerine

Glycerine distillation/ refining

The distillation is based on a packed tower where the glycerine is distilled, fractionated to separate both heavy and light boiling impurities and condensed.

Yellowish glycerine is condensed in a separate scrubber. Deodorisation can be supplied according to the material being processed.
Refining is continuous on three in line bleachers.

In case of spent lyes or bio-diesel glycerine a salt squeezing section is added.