| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for reducing the nitrogen content in a natural gas to less than 10 mole %. SOLUTION: There is provided a method for removing nitrogen contained in a natural gas comprising: (a) a step of absorbing hydrocarbon components in the natural gas using a straight naphtha composed substantially of 5-8C paraffins in an absorbing apparatus and discharging unabsorbed nitrogen, (b) a step of stripping the straight naphtha of the hydrocarbon components in a stripping column working at 150-200 deg.C at the bottom thereof, (c) a step of circulating the straight naphtha recovered in the stripping step back to the step (a), and (d) a step of supplying the stripped hydrocarbon components to a distributing circuit network. |
