The science of photochemistry is based on the interaction of molecules with quanta of light to produce unique molecular changes. The benefits of photo- chemistry are high yields and simplicity of control. Photochemical systems are ideal for "free radical" reaction mechanism. Applications are:

• Halogenations of organic compounds
• Production of primary mercaptans
• Oxydations
• Isomerizations
• Polymerizations
• Photolysis of toxic wastes

The products of industrial photo- chemical reactions are agricultural chemicals, intermediates, capro- lactam, and vitamin D, among other substances. Photochemistry is also used in the curing (polymerization) of specially formulated printing inks and coatings.

Hanovia has introduced the totally- packaged photochemical reactor system to simplify installation and increase operating efficiency, A photochemical reactor system consists of four elements: 1) The ultraviolet source; 2) Support equipment; 3) Power supply; and, 4) Electrical controls.