Glycerin refinement, the residual products have to be removed. Where water, salt, methanol, and few organic matter are some residual products. The process takes place in three slots.
- De-aeration
- Distillation
- Bleaching section
De-aeration has two main loops, i.e., re-circulation pump and heat exchanger. The pump works to circulate the crude glycerin into the vessel (de-aeration vessel). Then the glycerol transfers into the distillation column
The distillation process takes place in various steps. These are:
- Vaporization system
- Cleanliness of system
- Purification system
- Scrubbing system
The last process i.e. bleaching does purification. Where activated carbon helps in the removal of color and odour from the glycerin. After this process, the final product cools down and it needs to get stored in the container
The final pure glycerin can be used in pharmaceutical and technical industrial use.
For the technical grade, glycerin needs to be highly purified just like crystal water. It should not contains methanol, salts, soaps, and any other matter.
While For Pharmaceutical grade, glycerine is the one which is suitable for food, personal use, cosmetics, etc.
Glycerol can also be converted into some valuable products via thermo-chemical methods or Biological methods..