1,2-Dichloroethane

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**1,2-Dichloroethane**, commonly known as **ethylene dichloride** (**EDC**), is a chemical compound with the formula C2H4Cl2.

It is a chlorinated hydrocarbon. It is a colourless liquid with a chloroform-like odour. The most common use of 1,2-dichloroethane is in the production of vinyl chloride, which is used to make polyvinyl chloride (PVC) pipes, furniture and automobile upholstery, wall coverings, housewares, and automobile parts. 1,2-Dichloroethane is also used generally as an intermediate for other organic chemical compounds, and as a solvent. It forms azeotropes with many other solvents, including water (at a boiling point of 70.5 °C or 158.9 °F or 343.6 K) and other chlorocarbons.

1,2-Dichloroethane, also called ethylene dichloride, is a manufactured chemical that is not found naturally in the environment. It is a clear liquid and has a pleasant smell and sweet taste. The most common use of 1,2-dichloroethane is in the production of vinyl chloride which is used to make a variety of plastic and vinyl products including polyvinyl chloride (PVC) pipes, furniture and automobile upholstery, wall coverings, housewares, and automobile parts. It is also used to as a solvent and is added to leaded gasoline to remove lead.

1,2-dichloroethane is a member of the class of chloroethanes substituted by two chloro groups at positions 1 and 2. It has a role as a non-polar solvent, a hepatotoxic agent and a mutagen.

Ethylene Dichloride is a clear, colorless, oily, synthetic, flammable liquid chlorinated hydrocarbon with a pleasant chloroform-like smell that emits toxic fumes of hydrochloric acid when heated to decomposition. Ethylene dichloride is primarily used to produce vinyl chloride. Inhalation exposure to this substance induces respiratory distress, nausea and vomiting and affects the central nervous system, liver and kidneys. It is mutagenic in animals and is reasonably anticipated to be a human carcinogen. (NCI05)

## History

In 1794, physician Jan Rudolph Deiman, merchant Adriaan Paets van Troostwijk, chemist Anthoni Lauwerenburg, and botanist Nicolaas Bondt, under the name of Society of Dutch Chemists (Dutch: *Gezelschap der Hollandsche Scheikundigen*), were the first to produce 1,2-dichloroethane from olefiant gas (oil-making gas, ethylene) and chlorine gas. Although the *Gezelschap* in practice did not do much in-depth scientific research, they and their publications were highly regarded. Part of that acknowledgement is that 1,2-dichloroethane was called "Dutch oil" in old chemistry. This is also the origin of the archaic term "olefiant gas" (oil-making gas) for ethylene, for in this reaction it is ethylene that makes the Dutch oil. And "olefiant gas" is the etymological origin of the modern term "olefins", the family of hydrocarbons of which ethylene is the first member.

## Production

Nearly 20 million tons of 1,2-dichloroethane are produced annually in the United States, Western Europe, and Japan. Production is primarily achieved through the iron(III) chloride-catalysed reaction of ethylene and chlorine:

H2C=CH2 (g) + Cl2 (g) → ClC2H4Cl (l) (Δ*H*⊖r = −218 kJ/mol)

1,2-dichloroethane is also generated by the copper(II) chloride-catalysed oxychlorination of ethylene:

H

2

C

=

CH

2

2

HCl

1
2

O

2

⟶

ClC

2

H

4

Cl

H

2

O

{\displaystyle {\ce {H2C=CH2 + 2 HCl + 1/2O2 -> ClC2H4Cl + H2O}}}

## Uses

### Vinyl chloride monomer (VCM) production

Approximately 95% of the world's production of 1,2-dichloroethane is used in the production of vinyl chloride monomer (VCM, chloroethene) with hydrogen chloride as a byproduct. VCM is the precursor to polyvinyl chloride.

ClC2H4Cl → H2C=CHCl + HCl
The hydrogen chloride can be re-used in the production of more 1,2-dichloroethane via the oxychlorination route described above.

### Other uses

1,2-Dichloroethane has been used as degreaser and paint remover but is now banned from use due to its toxicity and possible carcinogenity. As a useful 'building block' reagent, it is used as an intermediate in the production of diverse organic compounds such as ethylenediamine. In the laboratory it is occasionally used as a source of chlorine, with elimination of ethene and chloride.

Via several steps, 1,2-dichloroethane is a precursor to 1,1,1-trichloroethane, which is used in dry cleaning. Historically, before leaded petrol was phased out, 1,2-dichloroethane was used as an anti-knock additive in petrol as a scavenging agent to prevent lead buildup.

## Safety

1,2-Dichloroethane is highly flammable and releases hydrochloric acid when combusted:

ClC2H4Cl + 5/2 O2 → 2 CO2 + H2O + 2 HCl
It is also toxic (especially by inhalation due to its high vapour pressure) and possibly carcinogenic. Its high solubility and 50-year half-life in anoxic aquifers make it a perennial pollutant and health risk that is very expensive to treat conventionally, requiring a method of bioremediation. While the chemical is not used in consumer products manufactured in the U.S., a case was reported in 2009 of molded plastic consumer products (toys and holiday decorations) from China that released 1,2-dichloroethane into homes at levels high enough to produce cancer risk. Substitutes are recommended and will vary according to application. Dioxolane and toluene are possible substitutes as solvents. Dichloroethane is unstable in the presence of aluminium metal and, when moist, with zinc and iron.

## Trivia

* The chlorine atoms make up approximately 71% of the molecule's mass.