Model SM Series - Solvent Recycling Systems Brochure

Distilling chlorinated solvents at atmospheric pressure can result in a waste residue of oils and greases containing between 20 and 50% of solvent! Using vacuum distillation this can be lowered to between 5 and 8%. However, the best solution is achieved by combining vacuum distillation with azeotropic distillation. How azeotropic distillation works: The process consists of a `soft` vacuum distillation for about 70-80% of the polluted solvent. Later, the concentrated residues in the boiler are treated by a flow of steam that strips the residue part of the solvent still present at a temperature at least 20% lower than the critical point at which acidification of the solvent can occur. This results in a yield of distilled solvent > 99.7% Solvent contained in the waste residue is only: 0.1 - 0.3% Solvent continually fed back to degreasing unit. The SM series machines can be supplied without the steam unit allowing many other degreasing solvents to be treated such as methylene chloride.