Methanol
CAS No.: 67-56-1 Formula: CH4O Molecular Weight: 32.04190
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Methanol

CAS No.: 67-56-1 Formula: CH4O Molecular Weight: 32.04190
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Description

Methanol, also known as methyl alcohol, wood alcohol, wood naphtha, methyl hydrate, or wood spirits, 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).[11] 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.[12]
Methanol burns in oxygen, including open air, forming carbon dioxide and water:
2 CH3OH + 3 O2 → 2 CO2 + 4 H2O
Methanol ingested in large quantities is metabolized first to formaldehyde and then to formic acid[13] or formate salts, which are poisonous to the central nervous system and may cause 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.

Basic Info

Numbering system

UNII Y4S76JWI15

Properties

Appearance & Physical State Clear, colorless liquid
Density 0.7918 g/cm3
Boiling Point 64.7 ºC
Melting Point -98 ºC
Flash Point 12 ºC
Refractive Index 1.328-1.330
Stability May decompose on exposure to moist air or water.
Storage Condition Store at RT.
Vapor Pressure 97.66mmHg (13.02 kPa, 20 °C)

Safety Info

RTECS PC1400000
Hazard Class 3
Safety Statements S16-S36/37-S45-S7
HS Code 2905110000
WGK Germany 1
Packing Group II
RIDADR UN 1230
Risk Statements R11; R23/24/25; R39/23/24/25
Hazard Codes F
Signal Word Danger
Hazard Declaration H225; H301 + H311 + H331; H370
Caution Statement P210; P280; P302 + P352 + P312; P304 + P340 + P312; P370 + P378; P403 + P235
Symbol GHS02, GHS06, GHS08
1H NMR : 90 MHz in CDCl3Expand

NMR Spectrum 1H NMR : 90 MHz in CDCl3

Collapse

C H4 O 0.05 ml : 0.5 ml CDCl3
methanol

Assign. Shift(ppm)
A 3.97
B 3.417

IR : liquid filmExpand
Mass Expand
Raman : 4880 A,200 M,liquidExpand
ESR : REDUCTION WITH TICL3 AND H2O2Expand
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