Sunday, January 21, 2018
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Glossary of solvents and related terms used in various industries

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Term Definition
Poly-Safe INL

Developed to replace hazardous washout solutions, new and improved Poly-Safe INL offers all the features of Poly-Safe II, and is even easier to use! Poly-Safe INL is ready for re-use after distillation - no additives are required! Other features include: - Reduces washout time up to 40%! - Requires no equipment modification. - Eliminates polymer buildup in processing equipment. - Consistent process times - even at high loading. - No hazardous air pollutants


Solidification of a liquid in the still due to the formation of large complex molecules by thermal decomposition of the initial distilland.

Printing Plate

Printing Plate is commonly used in offset printing. Printing Plate is a surface, usually made of metal, that has been treated to carry an image. During the printing process printing plates are inked and the ink is transferred to the paper or other surface by a printing press. Printing plates can also be made of rubber, synthetic rubber, and plastics.


Enrichment of the vapor by contact and interaction with the condensed liquid.


The liquid condensed from the rising vapor which returns to the pot flask.

Reflux ratio

Ratio between the boil up rate and the take-off rate.


Provides the same benefits of original Solvit, plus a substantial reduction in plate drying times.

Components: Petroleum Hydrocarbon 50%, Aliphatic Alcohol 50%

BOILING POINT: 353-390°F at 760 mm Hg MELTING POINT: Liquid at room temperature SPECIFIC GRAVITY (H2O=1): 0.87 @ 60°F VAPOR PRESSURE: 1 mm @ 100°F VAPOR DENSITY (AIR=1): 4.0 SOLUBILITY IN H2O: Less than 0.1% @ 77F % VOLATILES BY VOLUME: 100 EVAPORATION RATE: 0.1 (Butyl Acetate = 1) APPEARANCE AND ODOR: Clear, colorless liquid; aromatic hydrocarbon odor. VOC’S: 100% WEIGHT: 7.3 Pounds per Gallon


Distillate removed from the still in ml/minute or liters/hour.

Take-off rate

Amount of distillate removed from the still in a given period of time.


Naturally occurring organic compounds typically found in essential oils and citrus oils, used as cleaning agents in semi-aqueous systems. D-limonene, a hydrocarbon, is the most commonly used terpene in precision cleaning applications; some terpenes contain oxygen. Terpene compounds are found in motor fuels, dry cleaning processes; antifreeze; resins, perfumes, medicines, varnishes, lacquers and solvents. When evaporated, applied, spilled, or combusted they emit hydrocarbons into the atmosphere, which allows the creation of harmful ozone (O 3 ).

Theoretical plates

Unit used to measure the efficiency of the still. The theoretical plate is the contrivance which produces the same difference in composition that exists at equilibration of a liquid and a vapor. The more plates there are in a distillation column the greater the efficiency and separating ability.


The amount of liquid that can be distilled in a given time period.


Toluene, also known as methylbenzene, or Toluol, is a clear water-insoluble liquid with the typical smell of paint thinners, reminiscent of the related compound benzene. It is an aromatic hydrocarbon that is widely used as an industrial feedstock and as a solvent. Like other solvents, toluene is also used as an inhalant drug for its intoxicating properties; however this causes severe neurological harm. Toluol is a clear, colorless liquid with a distinctive smell. It occurs naturally in crude oil and in the tolu tree. It is also produced in the process of making gasoline and other fuels from crude oil and making coke from coal.

Total reflux

A condition which exists when the reflux valve is totally closed and all the condensed liquid is being returned down the column.


Trichloroethane is a stable, heavy low boiling-point colorless liquid, toxic if inhaled. Trichloroethane is either of two isomeric halogenated hydrocarbons, CH3-CCl3 or CH2Cl-CHCl2, that are used in several industrial applications, especially as solvents; Any of many derivatives of these compounds.

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