Abstract: The development of separation of CH4/N2 in coal-bed methane was reviewed. The main methods used in separation of CH4/N2 were discussed，including cryogenic distillation，pressure swing adsorption and membrane separation. The advantages and disadvantages of these methods in practical applications were compared，and the research results in different conditions were also analyzed. The prospect of separation of CH4/N2 in coal-bed methane was presented.

摘要： 介绍了近期针对煤层气中CH4/N2体系的分离工艺研究进展。论述目前应用于CH4/N2体系分离的主要方法，包括低温精馏、变压吸附和膜分离工艺，探讨了各种方法在不同工艺条件下的分离效果，以及在实际应用中的特点和技术上的改进，展望了未来的研究发展方向。