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Life cycle assessment of oxygen-18 production using cryogenic oxygen distillation

Chinese Journal of Chemical Engineering 2018年第9期26卷 1960-1966页

作者： Meysam Akbarian Shourkaei Abbas Rashidi Javad Karimi-Sabet Faculty of Engineering University of Mazandaran Material and Nuclear Fuel Research School (MNFRS) Nuclear Science and Technology Research Institute

In this study, life cycle assessment of oxygen-18 by using cryogenic distillation of oxygen is performed using SimaPro 8.3 software. Life cycle assessment is performed to understand the environmental profile and hotspots of this process in order to be used in design and development. Simulation of oxygen-18 process is executed by Hysys software, and the required inputs and outputs for inventory of life cycle were acquired. By doing life cycle assessment and considering achieved results after characterization and normalization of inventory data it has been investigated that in the majority of environmental impacts electricity consumption has a huge contribution relative to other parts of the system like liquefied oxygen production from air separation unit,required facilities for air separation and oxygen-18 units, and needed transportation. Also, among 17 impact categories investigated in ReCiPe impact assessment method, fossil depletion, climate change(human health),particulate matter formation, climate change(ecosystem), human toxicity, and metal depletion have the most contribution in entire environmental loads respectively. Furthermore, sensitivity analysis showed that changing life cycle impact assessment method from ReCiPe to IMPACT 2002+ has no significant effect on acquired results and results are confident. In addition, assumption of market for depleted oxygen from heavy isotopes which is withdrawn from top of distillation columns showed some positive effects compared to first case and environmental impacts resulted from liquefied oxygen production(feed) reduced but because of huge contribution of electricity consumption compared to other sections, this positive effect has no remarkable influence on entire environmental loads of product system.

关键词： Life cycle assessment Oxygen- 18 production cryogenic distillation Isotope separation

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Study of the robustness of a low-temperature dual-pressure process for removal of CO2 from natural gas

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Frontiers of Chemical Science and Engineering 2018年第2期12卷 209-225页

作者： Stefania Moioli Laura A. Pellegrini Paolo Vergani Fabio Brignoli Department of Chemistry Materials and Chemical Engineering "G. Natta" Politecnico di Milano Piazza Leonardo da Vinci 32 1-20133 Milano Italy Maire Tecnimont S.p.A. Via Gaetano De Castillia 6/A 1-20124 Milano Italy

The growing use of energy by most of world population and the consequent increasing demand for energy are making unexploited low quality gas reserves interesting from an industrial point of view. To meet the required specifications for a natural gas grid, some compounds need to be removed from the sour stream. Because of the high content of undesired compounds （i.e., CO2） in the stream to be treated, traditional purification processes may be too energy intensive and the overall system may result unprofitable, therefore new technologies are under study. In this work, a new process for the purification of natural gas based on a low temperature distillation has been studied, focusing on the dynamics of the system. The robustness of the process has been studied by dynamic simulation of an industrial-scale plant, with particular regard to the performances when operating conditions are changed. The results show that the process can obtain the methane product with a high purity and avoid the solidification of carbon dioxide.

关键词： CO2 capture innovative process cryogenic distillation dynamic simulation solid-liquid-vapor equilibrium

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Design and analysis of dual mixed refrigerant processes for high-ethane content natural gas liquefaction

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Chinese Journal of Chemical Engineering 2021年第1期34卷 354-364页

作者： Ting He Wensheng Lin Institute of Refrigeration and cryogenics Shanghai Jiao Tong UniversityShanghai 200240China

Recovery and purification of ethane has a significant impact on economic benefit improvement of the high-ethane content natural ***,current LNG-NGL integrated processes mainly focus on conventional natural gas,which are not applicable to natural gas with high ethane *** fill this gap,three dual mixed refrigerant processes are proposed for simulation study of high-ethane content natural gas *** proposed processes are optimized by a combination method of sequence optimization and genetic *** analysis is conducted to evaluate the three processes from the energetic and exergetic points of *** results show that the power consumption of Process 3 which compressing natural gas after distillation is the *** safety or other considerations,some common compositions of the mixed refrigerant may need to be removed under certain *** this,case studies of mixed refrigerant involving six composition combinations are carried out to investigate the effects of refrigerant selection on the process performance.

关键词： Natural gas liquefaction Ethane Dual mixed refrigerant cycle cryogenic distillation Refrigerant selection

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