Petroleum vapor control apparatus

An improved petroleum vapor control apparatus which reduces backpressure generated during scrubbing of petroleum vapors, comprising:

• a) a substantially air-tight housing, said housing comprising a compartment for holding conduits and at least one adsorber bed, wherein said compartment further comprises a floor, and wherein said at least one adsorber bed is located on said floor, said at least one adsorber bed comprising an adsorbent material, an inlet end, and an outlet end, said housing further comprising an opening;
• b) a first conduit passing through said opening for conducting petroleum vapors into said housing, said conduit having a first end and a second end, said first end being for connection to a source of petroleum vapors, said second end being connected to said inlet end of said at least one adsorber bed;
• c) a zone of controlled pressure in said housing outside of said at least one adsorber bed, said controlled pressure being in the range of about 0.5 psi to about 1.5 psi, wherein said controlled pressure assures that said petroleum vapors contact said adsorbent material for a sufficient length of time to effect the scrubbing of said vapors;
• d) a valve in said housing for maintaining said controlled pressure in said housing;
• and
• e) an outlet vent in said housing for venting scrubbed gases to the atmosphere.