A chromatographic separator characterized in that two pumps are employed
for controlling chromatographic separation that combines a first process
for supplying at least one of feed solution and eluent into a circulation
system and extracting the same quantity as that of liquid supplied into
the circulation system from one position of a packed column where some
component is enriched in the circulation system, and a second process for
circulating liquid in the system without supplying the feed solution and
eluent and extracting the separated component at all. Easy-to-control
chromatographic separator, in which a total number of pumps to be used is
decreased and high separation performance is attained through a simple
structure, can thereby be provided.