hacksaw is right. If you are sure the chlorine is dry and will always be dry 316ss can be used. If there is ever a chance of getting moisture in the system you need something else. The chlorine institute has some good information on materials of construction...
You don't say how much chlorine you need to produce, and that will impact the process design and equipment selection. The unit operations involved are generally; 1. Concentration, usually by membrane, but can be evaporation; 2. Purification, usually a combination of chemical treatment and...