Organic Solvent is a substance which dissolves or dilutes gases, liquids or solids without causing chemical reactions between solute and solute. As a rule, liquids such as water and liquid organic substances are used to dissolve other substances. But solids can also dissolve other substances. For example, gaseous hydrogen in solid material (metal-organic framework compounds, short MOFs) is dissolved in hydrogen tanks of fuel-operated cars.

The name has been found in the literature for more than 200 years. Solvents have been established in the research and laboratory sector, but in the industrial and technical large-scale chemicals solvents are used.

Definition of everyday life

The most famous solvent is water. However, in paints, varnishes, adhesives, etc., the term “solvent” is used to refer to substances which can cause unpleasant odors, health, and environmental damage as well as explosive fumes. This means solvents in the sense of TRGS (Technical Rules for Hazardous Substances) 610, according to which only volatile organic solvents with a boiling point of up to 200 ° C are referred to as solvents.

Solvent recycling methods

There are currently solvent recycling methods that can recover approximately 90% of the original volume of the liquids. In this way, the solvents are reused, and less pollution occurs. The operation of the recycling machine is relatively simple: the dirty solvent is placed in a Teflon tank covered with a stainless steel cap. The temperature of the solvent is raised above the boiling point using a thermostat. The liquid is volatilized and passed to a condenser, which is cooled with air, where the solvent is concentrated and re-used.

Solvent Recyclers must have the corresponding environmental rating to operate, which must also include the final destination of the distillate glues (energy recovery or incineration), as well as the treatment of the water generated.

The recycling plant must establish the quality specifications of the solvents to be recovered because their impurities can affect the process, as well as the standard of the recovered solvent so that the customer is aware of whether the product meets the requirements for the use. The quality specifications of the solvents recovered depend on the type of solvents. In general, for non-halogenated solvents, only purity of the solvent (% of water and purity) is specified, While halogenates should also indicate the presence of inhibitors to neutralize acids that are formed and metallic stabilizers that are added to prevent corrosion of metals when they come into contact with the solvent.

The cost of recycling depends, among other factors, on the quality of the solvent used to recycle (mixture, impurities, water content), on the required quality of the recycled solvent, on the quantity and type, Halogenated solvents. The separation at the point of generation of the different types of solvents favors the distillation. Of the quality of the solvent used to recycle (mixture, impurities, water content), the required quality of the recycled solvent, the quantity and the type, the recycling of the halogenated solvents being more expensive. The separation at the point of generation of the different types of solvents favors the distillation. Of the quality of the solvent used to recycle (mixture, impurities, water content), the required quality of the recycled solvent, the quantity and the type, the recycling of the halogenated solvents being more expensive. The separation at the point of generation of the different types of solvents favors the distillation.