Integrated olefin recovery and hydrogen production from refinery off-gases

A method of recovering olefins and for producing hydrogen from a refinery off-gas stream comprising:

• subjecting said refinery off-gas stream to a separation process to separate light ends including methane, hydrogen, and nitrogen from heavy ends including the olefins, thereby to produce a light ends stream;
• adding a natural gas stream to the light ends stream to form a combined stream;
• subjecting the combined stream to reforming to produce a reformed stream containing carbon monoxide and additional hydrogen;
• subjecting said reformed stream to a water gas shift reaction to produce an intermediate product stream containing yet additional hydrogen;
• and
• separating hydrogen from the intermediate product stream to produce a hydrogen product stream and a fuel stream containing nitrogen;
• the rate of addition of the natural gas stream being controlled so that the amount of nitrogen in the intermediate product stream is less than about five percent by volume on a dry basis.