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Uses of Chlorine

The chlorine tree
http://www.eurochlor.org/tree  

 Chemistry
Chlorine is used in the manufacture of Polyvinyl Chloride (PVC). This is the second largest tonnage of all thermoplastics after polyethylene.

 
  1. Ethylene and chlorine is first combined to form ethylene dichloride.

C2H4 + Cl2 à C2H4 Cl2

  1. Next, the ethylene dichloride is heated and chemically changed into new products through a process called cracking. The products formed are vinyl chloride (C2H3Cl), which is actually the monomer and HCl which will be recycled.

C2H4 Cl2 + Heat à C2H3Cl + HCl

  1. Lastly, the polymer is formed upon chemically combining the monomers together. Thousands of monomers may combine to form a single polymer of PVC. Once  Once formulated, the PVC is hard and brittle but can be made more flexible with the addition of plasticizers and more colourful by addition of colourants.

The presence of chlorine in PVC contributes to properties such as:

In Jurong Island, the CIFE company produces chlorine and transports the products to Teijin for them to produce polycarbonates.