Two or more cyclone systems can be contained in a single vessel. Each
cyclone system can be in fluid communication with an inlet stream and a
fluid discharge line. First cyclone system can include a vent open to the
cyclone containing vessel. Second cyclone system can be sealed to
restrict fluid entry from and/or exit into vessel, which can inhibit
product vapors from exiting the vent of one cyclone system into the
vessel and flowing into the vent of the other cyclone system.