(19d) CO2 Tolerant N2 Rejection From Natural Gas

Associated gas from the oil industry has been flared for decades. The prevailing attitude towards CO₂ emissions and other pollutants requires smart approaches to processing low BTU gases in a cost effective and environmentally responsible manner.

The injection of nitrogen into oil reservoirs for Enhanced Oil Recovery (EOR) represents a new challenge for cryogenic nitrogen rejection technology. Over the duration of the production, the nitrogen concentration in the resulting associated gas will steadily increase over time from a few percent up to 50 vol % or more of the entire gas flow.

A new approach for CO2 tolerant cryogenic nitrogen rejection from sales with varying nitrogen content downstream NGL extraction will be discussed.