Chlor Alkali Process
 EDC/VCM Process
 PVC Process
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EDC/VCM Process

Ethylene is currently the predominant raw material for vinyl chloride production. The commercially practiced vinyl chloride production involves a balanced combination of Direct Chlorination (DC) and Oxy-Chlorination (OC) processes.

In the Direct Chlorination process, ethylene is first chlorinated to produce ethylene dichloride (CH2Cl-CH2Cl).

            CH2=CH2  +  Cl2  → CH2Cl-CH2Cl                                        (1)

Ethylene dichloride is subsequently subjected to thermal cracking process (pyrolyzed) to produce vinyl chloride (CH2=CHCl)  and hydrogen chloride (HCl).

            CH2Cl-CH2Cl  → CH2=CHCl  + HCl                                      (2)

In the Oxy-Chlorination process, ethylene, hydrochloric acid (HCl) from Reaction (2) and oxygen (O2) are reacted to form ethylene dichloride (CH2Cl-CH2Cl).

            CH2=CH2  +  Cl2 + ½ O2 → CH2Cl-CH2Cl + H2O                  (3)

Adding Reactions (1), (2) and (3) gives the overall reaction for balanced process:

            2 CH2=CH2  +  Cl2 + ½ O2 → 2 CH2=CHCl + H2O                (4)

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