Patent ID: 7560010

Claim:
A diaphragm electrolytic cell for the electrolytic production of chlorine and alkali comprising a lower module equipped with a lower anodic package and a lower cathodic package and at least one upper module overlaid thereon equipped with an upper anodic package and an upper cathodic package, said modules being hydraulically connected in series, said hydraulic connection in series comprising an external manifold for the product alkali and a direct fluid communication between said upper anodic package and said lower anodic package by means of holes or slots provided in a conductive frame acting as a base for said upper anodic package, wherein at least one of said modules is equipped with U-shaped anodes comprising two vertical major surfaces fixed to a first horizontal current collector, additional titanium-lined copper current collectors being externally secured to at least one of said vertical major surfaces, diaphragm-coated cathodes being housed in the hollow space inside said vertical major surfaces.