Vinyl Chloride From Ethylene

In one ethylene is converted to 1 2 dichloroethane ethylene chloride by reaction with chlorine.

Vinyl chloride from ethylene.

The purified ethylene dichloride undergoes selective cracking to form vinyl chloride. The liquid stream from the quench tower as well as the condenser is fed to the vinyl still which produces the vinyl chloride product. Hence to save the processing cost for manufacturing ethylene numerous attempts have been made to convert ethane directly to vinyl chloride. Vinyl chloride also known as vinyl chloride monomer vcm and chloroethene is an organochloride compound.

The five main processes used in the production of vinyl chloride monomer vcm are. Ethylene first reacts with chlorine to produce ethylene dichloride. As there is vinyl chloride in the polymer s backbone the emulsion possesses excellent characteristics such as excellent flame retardancy and water alkaline resistance. Method for preparing vinyl chloride from ethylene is carried out by the oxidehydrochlorination reaction.

The feedstock for the thermolysis can be obtained from two routes. Production of vinyl chloride from ethylene today vinyl chloride is almost exclusively manufactured by thermal cleavage dehydrochlorination of 1 2 dichloroethane edc. The gases from the quench tower then enter a partial condenser which produces hcl as a gas and the liquid stream consisting of vinyl chloride unreacted ethylene dichloride and polychlorides. Ethylene vinyl acetate eva also known as poly ethylene vinyl acetate peva is the copolymer of ethylene and vinyl acetate the weight percent of vinyl acetate usually varies from 10 to 40 with the remainder being ethylene.

There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used. Ethylene is made from ethane by cracking ethane and then ethylene is used for production of vinyl chloride. Heating 1 2 dichloroethane in the presence of a charcoal catalyst gives vinyl chloride. These processes are shown in figure 1.

Vcm is a major commodity chemical mainly used in the production of the polymer. The major industrial preparation of vinyl chloride begins with ethylene and has two variants. 1 direct chlorination of ethylene to form edc 2 oxychlorination of ethylene to form from recycled hcl and oxygen 3 purification of edc 4 thermal cracking of edc to form vcm and hcl and 5 the purification of vcm.