Question:
In the production of polyvinyl chloride (PVC) from ethylene and chlorine, the sequential order of reactions is
In the production of polyvinyl chloride (PVC) from ethylene and chlorine, the sequential order of reactions is
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This two-step process is fundamental in the PVC production industry, with each step carefully controlled to maximize yield and minimize by-products.
Updated On: Apr 11, 2025
- Chlorination followed by Dehydrochlorination
- Dehydrochlorination followed by Chlorination
- Hydrogenation followed by Chlorination
- Dehydrochlorination followed by Hydrogenation
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The Correct Option is A
Solution and Explanation
The process for manufacturing PVC involves two primary chemical reactions. Initially, ethylene (\(C_2H_4\)) is chlorinated to form 1,2-dichloroethane (\(C_2H_4Cl_2\)), commonly known as ethylene dichloride (EDC). This reaction is the chlorination step. Subsequently, the EDC undergoes a dehydrochlorination process to produce vinyl chloride monomer (VCM), the precursor for PVC polymerization.
Step 1: Chlorination of Ethylene: Ethylene reacts with chlorine gas, forming EDC. \[ C_2H_4 + Cl_2 \rightarrow C_2H_4Cl_2 \]
Step 2: Dehydrochlorination of EDC: EDC is heated and decomposed to yield VCM and hydrogen chloride. \[ C_2H_4Cl_2 \rightarrow CH_2=CHCl + HCl \]
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