对RSV工艺进行适应性分析时发现，在进行中高压富气乙烷回收时存在对原料气气质、CO₂适应性差及流程热集成度低的问题。采用改变气源、多级分离、吸收塔汽提的方法来改善第二股进料气质，即采用侧线抽出脱甲烷塔上部气相来替换低温分离器气相作为第二股进料，提出带压缩和部分干气再循环的改进工艺（supplemental rectification with compression and recycle split vapor，SRCR）。对低温分离器液相进行汽提精馏、两级分离的方法来取代低温分离器气相作为第二股进料，提出带汽提的部分干气再循环工艺（recycle split vapor with gas extraction process，RSVG）、带闪蒸的部分干气再循环工艺（recycle split vapor with liquid flashing process，RSVF），通过对比功耗、改进成本及热集成度优选出RSVF工艺。对RSVF工艺进行适应性分析发现，原料气压力越大RSVF工艺越节能，并且对气质及CO₂摩尔分数适应性显著增强。

It is found through analyzing the adaptability analysis of recycle split vapor (RSV) process that there exist problems such as poor adaptability to the quality of feedstock gas and CO₂,and low heat integration degree during recovering ethane from medium-high pressure rich gas.The quality of the second feed gas can be improved by changing gas source,employing multi-stage separation,and stripping at absorption tower.Supplemental rectification with compression and recycle split vapor (SRCR),a modified RSV process,is proposed,i.e.,the gas phase at the upper part of the demethanizer is extracted by the side line to replace the gas phase from the cryogenic separator as the second feed with compression and part Improved process of dry gas recycling.RSVG (a RSV with gas extraction process) and RSVF (a RSV with liquid process) are designed,in which the method for conducting gas-lifting rectification and two-stage separation to the liquid phase of the cryogenic separator is used to replace the gas phase of the cryogenic separator as the second feed.RSVF process is considered to be the optimal one by comparing power consumption,improving cost and thermal integration degree.It is found through analyzing the adaptability of RSVF process that the higher the feed gas pressure,the more energy-saving the RSVF process,and its adaptability to gas quality and CO₂ content enhances significantly.