VCM (Vinyl Chloride Monomer)

Formula

CH2 = CH - Cl

Description

Vinyl Chloride Monomer (VCM, Monochloroethylene) is a reactive gas with a faint odor and is extremely flammable. Under refrigeration, VCM is converted into liquid with a density of 0.91 gm/cc. VCM is sparingly soluble in water and soluble in alcohol.

Properties

ParameterUnitQuantity
Molecular weightg/mol62.5
Boiling point°C at 1.0 atm-13.8
Freezing point°C-158.8
CAS number75-01-4
IUPAC nameChloroethene

Specifications

ParameterUnitQuantityTest Method
Purity (1)% mol99.9 min.By difference
Color (2)VisualcolorlessVisual
AppearanceVisualclearVisual
Ethyleneppm, mol2 max.720-C/CCSD-2001
Acetyleneppm, mol2 max.720-C/CCSD-2001
Propyleneppm, mol3 max.720-C/CCSD-2001
1,3 Butadieneppm, mol10 max.720-C/CCSD-2001
Total dichloro compoundppm, mol20 max.720-C/CCSD-2001
Waterppm, wt100 max.720-C/CCSD-2002
Acidity as HClppm, wt2 max.720-C/CCSD-2008
Ironppm, wt0.5 max.720-C/CCSD-2009
Non volatile residueppm, wt100 max.720-C/CCSD-2018
Hydroquinone (3)ppm, wt2 min 5 max.CHVCM030

(1) "Vinyl Chloride Monomer purity is obtained by subtracting the sum of all the hydrocarbon and
non-hydrocarbons impurities as obtained by ASTM D-2712."
(2) For Export Sales only.
(3) Port storage and export shipment only.

Hazards and safety

VCM is extremely flammable and known as a human carcinogen. Large fires triggered by VCM are difficult to extinguish. It has dangerous toxic effects when absorbed by the skin or inhaled. It also causes severe irritation of the eyes.

ParameterUnitQuantity
Threshold limit valueppm1
Flash point°C-78
Explosive limitsvol % in air3.6-33
UN or ID No.1086

Applications

About 98% of VCM production is polymerized to produce Polyvinyl Chloride (PVC), a commonly used plastic, particularly in the piping and construction industries.

Storage and handling

VCM is stored as a liquid at -14°C to -22°C in large spherical steel tanks with 56 ppm of hydroquinonme stabilizer. Avoid contact with copper, any ignition source or heat. Keep away from oxidizing agents, caustic soda and reactive metals. Wear goggles, self-contained breathing apparatus and rubber over clothing.

VCM stabilized liquid is shipped in spherical refrigerated steel tanks. Between loads, the vessel tank must be carefully dried, then purged with nitrogen. VCM in a gaseous form must be controlled carefully under refrigeration.

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