X
  • Methanol

 

Methanol

Methanol, also known as methyl alcohol among others, is a chemical with the formula CH3OH (often abbreviated MeOH). Methanol acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Today, industrial methanol is produced in a catalytic process directly from carbon monoxide, carbon dioxide, and hydrogen.
Methanol is the simplest alcohol, being only a methyl group linked to a hydroxyl group. It is a light, volatile, colorless, flammable liquid with a distinctive odor very similar to that of ethanol (drinking alcohol). However, unlike ethanol, methanol is highly toxic and unfit for consumption. At room temperature, it is a polar liquid, and is used as an antifreeze, solvent, fuel, and as a denaturant for ethanol. It is also used for producing biodiesel via transesterification reaction.
Methanol is produced naturally in the anaerobic metabolism of many varieties of bacteria, and is commonly present in small amounts in the environment. As a result, the atmosphere contains a small amount of methanol vapor. But in only a few days, atmospheric methanol is oxidized by sunlight to produce carbon dioxide and water.
Methanol is also found in abundant quantities in star forming regions of space, and is used in astronomy as a marker for such regions. It is detected through its spectral emission lines.
Methanol when drunk is metabolized first to formaldehyde and then to formic acid or formate salts. These are poisonous to the central nervous system and may result in blindness, coma, and death. Because of these toxic properties, methanol is frequently used as a denaturant additive for ethanol manufactured for industrial uses. This addition of methanol exempts industrial ethanol (commonly known as "denatured alcohol" or "methylated spirit") from liquor excise taxation in the US and some other countries.

Analysis

Grade: Methanol
 Item
Test Method
Limited
 Purity (wt %)
ASTM E-346
Min. 99.85
 Water (%wt)
ASTM E-346
Max. 0.10
 Specific gravity @ 20D/20DC
ASTM E-1064
Max. 0.7928
 Ethanol (wt %)
ASTM D-4052
Max 0.005
 Acetone (wt %)
ASTM E-346
Max. 0.003
 Permanganate time
ASTM D-1363
Greater than 50 Min.
 Non volatile matter
ASTM D-1353
Less than 8mg/1000 ml
 Distillation Range @ 760 mmHg
ASTM D-1078
Not more than 1DC and shall include 64.6 DC ± 0.1DC
 Color, PT-Cobalt Scale
ASTM D-1209
Max. 5
 Carbonizable, PT-Cobalt Scale
ASTM E-346
Max. 30
 Appearance
IMPCA-003
Clear and free from suspend matter
 Odor
ASTM D-1296
Non- Residual
 Acidity as CH3COOH (wt %)
ASTM D-1613
Max. 0.003
 Alkalinity as NH3 (wt %)
ASTM D-1614
Max. 0.003
 Miscibility
ASTM D-1722
Passes test
 Iron (ppm)
ASTM E-202
Max. 0.1
 Chloride (ppm)
ASTM D-512
Max. 0.5
 Sulphur(mg/kg)
ASTM D-3961
Max. 0.5
 TMA (1)
OPTIONAL
 Aromatics(2)
OPTIONAL