Difference between revisions of "Toluene"
(→Availability) |
|||
| Line 10: | Line 10: | ||
==Availability== | ==Availability== | ||
| − | Toluene is available at hardware as paint thinner, sometimes mixed with other hydrocarbons, depending on the product. Fractional distillation can be used to distill the components. | + | Toluene is available at hardware as paint thinner, sometimes mixed with other hydrocarbons, depending on the product. Fractional distillation can be used to distill the components. Some solvents and thinners contain toluene mixed with water-miscible organics; technical grade toluene can be separated from such solvents by adding water. |
==Preparation== | ==Preparation== | ||
Revision as of 07:49, 30 August 2015
Toluene or methylbenzene is a clear, water-insoluble organic liquid, used as paint thinner and organic solvent. It is an aromatic hydrocarbon.
Contents
Properties
Chemical
The methyl group makes toluene around 25 times more reactive than benzene in electrophilic aromatic substitutions. The addition of a halogen in the presence of UV light will yield benzyl halides. Reaction with potassium permanganate yields benzoic acid.
Physical
Toluene is liquid at standard conditions, with a characteristic sweet, solvent-like smell. It is less dense than water, with a density of 0.87 g/mL. Toluene melts at -95 °C and boils at 111 °C. It is insoluble in water, but miscible with many organic solvents. Toluene exhibits iridescence.
Availability
Toluene is available at hardware as paint thinner, sometimes mixed with other hydrocarbons, depending on the product. Fractional distillation can be used to distill the components. Some solvents and thinners contain toluene mixed with water-miscible organics; technical grade toluene can be separated from such solvents by adding water.
Preparation
There are a few ways to prepare toluene. One method involves the methylation of benzene with a methyl halide, such as methyl chloride in the presence of anhydrous aluminium chloride. Since toluene is less toxic than benzene, this is a good way, albeit consuming, to eliminate benzene.
Projects
- Benzoic acid
- Benzaldehyde synthesis
- Mono, di and trinitrotoluene
- Sulfur extraction
Handling
Safety
Toluene vapors can cause headaches, dizziness, nausea, so work should be performed in a fume hood or outside. Toluene is less toxic and carcinogenic than benzene, meaning it can be used as a substitute for benzene as a solvent.
Storage
Toluene is less volatile than other hydrocarbons, but due to its strong smell it's best to store it in closed bottles, and kept in a solvent cabinet.
Disposal
Burning toluene will release soot, so it's best to dispose of it using Fenton's reagent.
