A process of reducing the sulfur content of gasoline product comprising at least
three concurrent steps: a) passing input fluid comprising pollutant through at
least one adsorber to produce a polluted adsorber and a purified fluid stream which
leaves the adsorber, stopping the flow into said adsorber to leave residual fluid
therein, and separating said residual fluid therein said adsorber to leave the
polluted adsorber of reduced residual fluid content, b) heating a polluted adsorber
with a heated regeneration gas to produce a hot adsorber and cooler regeneration
gas, c) contacting a heated adsorber with a regeneration gas (of a lower temperature
than that of said adsorber) to produce a cooler adsorber and a warmer regeneration
gas, which gas is further heated to produce said heated regeneration gas which
is pass to step b), said process comprising at least 3 adsorber, at least one of
which being subjected to step a) at least one different adsorber to step b) and
at least one further different adsorber being subjected to step c) and after completion
of one step the adsorber produced is subjected to the next step in the cyclic sequence a)-b)-c)-a).
