The present invention relates to vacuum pressure swing adsorption (VPSA) process to recover carbon dioxide having a purity of more than 90% from streams containing at least carbon dioxide and nitrogen (e.g., flue gas from power plant). The feed to the CO2 VPSA can be at moderate temperature and at low CO2 partial pressures. The CO2 VPSA unit produces two streams, a high purity CO2 product suitable for sequestration and nitrogen enriched waste stream which can be vented . This invention highlights that CO2 product purity and recovery ,which are the key performance indicators of the VSA process ,depend on the arrangements of VSA cycle steps in a particular manner, apart from adsorbent properties. This has been leveraged in the present invention to get desired performance. Hence an improved multistep VSA cycle is designed and implemented in a custom designed fully automated PC/PLC based three columns apparatus to get high CO2 recovery with high purity suitable for sequestration[IN-DEL-2011-02654A]
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机译：本发明涉及真空变压吸附（VPSA）方法，以从至少含有二氧化碳和氮气的流（例如，来自电厂的烟道气）中回收纯度大于90％的二氧化碳。 CO2 VPSA的进料可以在中等温度下且CO2分压低。 CO2 VPSA装置可产生两股气流，一种高纯度的CO2产品（适合封存）和富氮废气流，可以排出。本发明着重指出，CO 2产物的纯度和回收率是VSA方法的关键性能指标，除了吸附剂性能以外，还取决于VSA循环步骤以特定方式的布置。在本发明中已经利用这一点来获得期望的性能。因此，在定制的基于PC / PLC的全自动三塔仪器中设计并实施了改进的多步VSA循环，以实现高二氧化碳回收率和高纯度，适合封存[IN-DEL-2011-02654A]
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