Processes and devices for recovering natural gas liquid from a hydrocarbon containing gas are provided by introduction of compressed air to a vortex tube. The vortex tube generates a cold air stream that is introduced into a heat exchanger. A hydrocarbon containing gas of higher temperature than the cold air stream is introduced into the heat exchanger, so that the cold air stream in the heat exchanger cools the hydrocarbon containing gas to condense natural gas vapors in the hydrocarbon containing gas to liquid hydrocarbons. In this manner, liquid hydrocarbons and dry hydrocarbon containing gas are obtained.

A fuel gas conditioning unit includes a brazed aluminum heat exchanger including a plurality of parting sheets defining a plurality of separate flow channels positioned between the plurality of parting sheets, a plurality of fin sheets positioned in the plurality of flow channels, a feed inlet configured to receive a raw feed stream, a cooled feed outlet configured to discharge a cooled feed stream formed from the raw feed stream, a fuel outlet configured to discharge a finished fuel gas stream, and a liquids outlet configured to discharge a finished liquids stream, an expansion device coupled to the heat exchanger and configured to receive a cooled fuel stream from the heat exchanger and discharge an expanded fuel stream formed from the cooled fuel stream, and a feed separator where the heat exchanger is configured to form the finished fuel gas stream and the finished liquids stream.

Methods of butane delivery, methods for reducing VOC emissions resulting from such delivery, and methods for debutanizing nitrogen gas used to expel butane from butane storage tanks.