| 摘要 |
The present invention relates to a separation method of high purity methane gas from biogas comprising: a first step of compressing and cooling the biogas; and a second step of adopting the biogas compressed and cooled in the first step to a four-step polymer separation membrane for a gas separation as a residual portion stream of a first polymer separation membrane is connected to a second polymer separation membrane, and a residual portion stream of the second polymer separation membrane is connected to a third polymer separation membrane, and a penetration portion stream of the second polymer separation membrane is connected to a fourth polymer separation membrane. According to the present invention, the separation method of high purity methane gas from biogas has an effect on producing high purity methane from the biogas produced from a food waste and an organic matter, and on increasing productivity of the methane by recirculating to re-refine a little amount of the residual methane through a four-step separation membrane process. Furthermore, the present invention enables to separate high purity carbon dioxide. |
