Patent ID: 8709135

Claim:
A device comprising: a vapor dryer configured to remove substantially all the water vapor from a contaminated off gas, wherein the off gas exhausted from the vapor dryer is substantially dry; a vapor elimination device having a plurality of heat exchange modules, the off gas being input into a first heat exchange module to cause recovery of the first heat exchange module that has been cooled by warming it and thereby causing the off gas to experience a net cooling, the off gas then being input into a second heat exchange module to further cool the off gas; and a collection module for collecting liquid contaminants that are condensed at each heat exchange module; wherein each heat exchange module comprises at least one air-to-air heat exchanger and at least one air-to-refrigerant heat exchanger and wherein the heat exchange modules are used to warm and cool the off gas; wherein the plurality are two heat exchange modules, wherein the heat exchange modules reciprocally work together to cause recovery of the first heat exchange module while the second heat exchange module causes further cooling of the off gas, and periodically reversing the flow of off gas wherein the second heat exchange module recovers while the first heat exchange module further cools the off gas; wherein the flow of off gas through the vapor elimination device is controlled by valve and flows in a first or a second configuration; wherein the first configuration comprises flowing the off gas through a first heat exchange module air-to-air heat exchanger, then through a first heat exchange module air-to-refrigerant heat exchanger, then through a second heat exchange module air-to-air heat exchanger, and then through a second heat exchange module air-to-refrigerant heat exchanger; and wherein the second configuration comprises flowing the off gas through the second heat exchange module air-to-air heat exchanger, then through the second heat exchange module air-to-refrigerant heat exchanger, then through the first heat exchange module air-to-air heat exchanger, and then through the first heat exchange module air-to-refrigerant heat exchanger.