초록 ▼

Mercury is often removed as an impurity from process fluid streams by adsorption in fixed beds using any of several well-known adsorbents having the ability to selectively adsorb mercury. It is also common to reintroduce this sequestered mercury into the environment by means of the spent gas used to

Mercury is often removed as an impurity from process fluid streams by adsorption in fixed beds using any of several well-known adsorbents having the ability to selectively adsorb mercury. It is also common to reintroduce this sequestered mercury into the environment by means of the spent gas used to periodically regenerate the fixed beds. A solution to this problem is provided by the present invention in which the mercury is removed from the process stream using at least two cyclically regenerated adsorption beds in combination with a condenser whereby upon regeneration of one bed, the regeneration stream effluent therefrom is treated in the condenser to recover the bulk of the mercury as liquid mercury and recycling the overhead from the condenser to another bed engaged in the adsorption-purification of fresh feedstock.

대표청구항 ▼

In the process for removing mercury from a feedstock fluid stream containing a mercury concentration of at least 0.02 m3 which comprises passing said stream as a feedstock periodically in sequence through at least two fixed beds containing a selective adsorbent for mercury, each of said beds cyclica

In the process for removing mercury from a feedstock fluid stream containing a mercury concentration of at least 0.02 m3 which comprises passing said stream as a feedstock periodically in sequence through at least two fixed beds containing a selective adsorbent for mercury, each of said beds cyclically undergoing the stages comprising: (a) adsorption, wherein the feedstock is passed through said bed and the mercury constituent thereof is selectively adsorbed and the non-adsorbed constituents are removed from the bed as an effluent having a reduced concentration of mercury; and (b) purge desorption, wherein the adsorbed mercury is desorbed by the passage therethrough of a regeneration fluid stream until the major proportion of the adsorbed mercury has been removed from the bed in the bed effluent; the improvement which comprises operating the adsorption and purge desorption stages in the beds so that the adsorption stage in at least one bed coincides with the purge desorption stage in another bed, and passing the effluent stream from the bed undergoing purge desorption to the bed undergoing adsorption with an intermediate passage through a condenser wherein at least a portion of the mercury content is condensed and recovered as liquid mercury.