Continuous Sparbleach bleaching
The originality of Sparbleach® is
that the adsorption of coloring matters by the bleaching earth is enhanced by
means of sparge steam resulting in a significant saving in bleaching earth.
The Sparbleach® is a two
stage vessel. Oil/earth mixure is introduced under vacuum into the top stage
where it is heated and continuously agitated by injected sparge steam.
The dispersion of earth at optimum conditions of : vacuum temperature combined
with steam agitation of the oil mass ensures ideal conditions to start the
The bottom holding compartment where the decoloration is completed is equipped
with an arrangement of partitions ensuring uniform residence time and sparge
High, uniform product quality assurance.
Reduced bleaching earth consumption in comparison to bleachers using
No moving parts, i.e. no need to stock replacements for expensive
mechanical seals or gearboxes.
Heating using steam heated coils means a significant reduction in
Easy access for routine maintenance and savings in labour costs.
Oil recovery from filter cake by steam blowing
De Smet has developped this new technology, which has now been adopted on a
large scale by the industry.
This new process is based on the re-use of the spent bleaching earth, without
removing it from the bleaching filters. Once the spent bleaching earth is
re-used in the filter, it is discharged and evacuated.
The prefiltration requires an additional filter.
- Substantial reduction of bleaching earth consumption
- Reduction of oil loss
- Reduction of utilities consumptions.