System and method for producing a hydrocarbon product stream from a hydrocarbon well stream, and a hydrocarbon well stream separation tank

A hydrocarbon well stream separation tank is employed for handling a hydrocarbon well stream. The tank has a lower compartment (102) for separating a liquid of a liquid phase from a vaporous hydrocarbon phase of the hydrocarbon well stream and an inlet (110) for allowing the hydrocarbon well stream to flow from outside of the hydrocarbon well stream separation tank into the lower compartment of the hydrocarbon well stream separation tank. The tank further has an upper compartment (104) located gravitationally above the lower compartment, and an internal passage (106) fluidly connecting the lower compartment and the upper compartment. A filter (108), capable of filtering mercury from the vaporous hydrocarbon phase, is disposed in the upper compartment.