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Overview 

As an industry leader, OxyVinyls develops and currently licenses its EDC and VCM technologies to qualified manufacturers around the world. OxyVinyls has granted more than 72 EDC/VCM plant licenses.

Since the early 1960s, OxyVinyls professionals have been providing services required to select, design, construct, start up and operate the most efficient EDC, VCM and PVC facilities. OxyVinyls' licensing program now focuses on EDC and VCM technologies and provides highly trained technical specialists with expertise in process design and development, training, start-up assistance and an effective, ongoing technical assistance and support program.

OxyVinyls' licensing program also includes a "know-how" exchange program that facilitates meetings every two years for participating licensees to discuss and exchange improvement ideas and technological advances.

OxyVinyls' Plant Design

OxyVinyls' technology offers flexible configuration options, allowing the use of a wide range of feedstock properties. For example, production processes can accommodate vapor, liquid or cell gas chlorine, polymer grade or impure ethylene, and oxygen from cryogenic or pressure swing adsorption units.

The OxyVinyls process can be configured to accept imports of EDC, HCl and chlorinated organic liquids from other manufacturing processes. Plants can also produce sales grade EDC for export if desired.

Computer process control systems, emissions monitoring, and procedures required by plant specifications all contribute to a safe working and community environment.

OxyVinyls' plant designs incorporate:


  • Strong emphasis on safety and worker protection
  • Best available environmental control facilities and equipment
  • High raw material efficiencies
  • High on-stream factors
  • Energy conservation and recovery features
  • Proven construction materials to minimize capital and maintenance costs
  • Sophisticated, state-of-the-art distributed control and safety interlock systems
  • Productive and efficient operating processes

Catalyst Products

OxyVinyls offers a full range of patented catalyst products for VCM production. OxyVinyls' catalyst products include Oxychlor® fluid bed oxychlorination catalysts, Catoxid® fluid bed catalytic oxidation catalyst and Super H-2® acetylene hydrogenation catalyst.

VCM Technology

OxyVinyls led the development of a "balanced" process for producing VCM from chlorine and ethylene feedstocks with the introduction of fluid bed oxychlorination technology. OxyVinyls' current licensing technology is in its eighth generation. Plants currently using OxyVinyls technology constitute more than a third of the world's VCM capacity.

OxyVinyls' processes offer flexible configuration options, allowing a range of ethylene-based feedstocks. Vinyl chloride monomer (VCM) manufacturing begins with the production of ethylene dichloride (EDC), also known as 1, 2-dichloroethane. EDC can be produced by combining ethylene and chlorine via either direct chlorination, which uses elemental chlorine and ethylene, or oxychlorination, in which ethylene reacts with the chlorine in hydrogen chloride (HCl).

In the direct chlorination process, chlorine is added to ethylene to produce EDC.

C2H4 + Cl2 → C2H4Cl2

VCM is made by cracking EDC to yield equimolar amounts of VCM and hydrogen chloride (HCl).

C2H4Cl2 → C2H3Cl + HCl

This HCl is recovered in the subsequent VCM purification step, and reacted with oxygen and additional ethylene in the oxychlorination process to make more EDC.

C2H4 + 2HCl + ½O2 → C2H4Cl2 + H2O

Combining these three reaction steps into an integrated operation forms the basis for the balanced VCM process, in which vinyl chloride is made from chlorine, ethylene and oxygen.

C2H4 + Cl2 → C2H4Cl2
2 C2H4Cl2 → 2 C2H3Cl + 2 HCl
C2H4 + 2HCl + ½O2 → C2H4Cl2 + H2O

overall,
2 C2H4 + Cl2 + ½O2 → 2 C2H3Cl + H2O

Other components of the VCM process include VCM purification, EDC purification, hydrogenation, and byproduct separation and catalytic oxidation.

Balanced VCM Process