A process for preparing 1,2-dichloroethane by reacting about 2 mols of ethylene, about 4 mols of hydrogen chloride and about 1 mol of oxygen in the presence of a fixed bed of supported catalyst based on copper chloride in only one reaction zone at a pressure of from 2 to 10 bar and at from 220 to 280 C. The element isolation insulating layer is positioned in a surface of the substrate. The at least one optical microstructure is disposed on a top end of the prism component. The controlling unit also causes the displaying unit to switch the displays based on menus selected on the menu screen. Access to objects is controlled through a multi-level security protocol. , by reducing a bitrate, modifying a quantization parameter to increase quantization, andor reducing a frame rate relative to the first mode.