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Journal Article 4

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PFCs 2

process simulation 2

Activated carbon regeneration 1

CF₄ 1

Molten sodium hydroxide 1

Thermal degradation 1

calcium hydroxide 1

catalytic hydrolysis 1

economic analysis 1

perfluorinated compounds (PFCs) 1

perfluorooctane sulfonate (PFOS) 1

perfluorooctanoic acid (PFOA) 1

polyfluoroalkyl compounds (PFCs) 1

sorption enhanced 1

surface water 1

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Thermal defluorination behaviors of PFOS, PFOA and PFBS during regeneration of activated carbon by molten salt

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 8, doi: 10.1007/s11783-022-1524-9

Abstract:

• New method of mineralizing PFCs was proposed.

Keywords： PFCs Molten sodium hydroxide Thermal degradation Activated carbon regeneration

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Determination of polyfluoroalkyl compounds in water and suspended particulate matter in the river Elbe and North Sea, Germany

Lutz AHRENS, Merle PLASSMANN, Zhiyong XIE, Ralf EBINGHAUS

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 2, Pages 152-170 doi: 10.1007/s11783-009-0021-8

Abstract: The distribution of polyfluoroalkyl compounds (PFCs) in the dissolved and particulate phase and theirThe PFCs quantified included C -C perfluorinated sulfonates (PFSAs), 6∶2 fluorotelomer sulfonate (6∶PFCs were mostly distributed in the dissolved phase, where perfluorooctanoic acid (PFOA) dominated withThe total flux of ∑PFCs from the river Elbe was estimated to be 802 kg/year for the dissolved phase andThis indicates that the river Elbe acts as a source of PFCs into the North Sea.

Keywords： polyfluoroalkyl compounds (PFCs) perfluorooctane sulfonate (PFOS) perfluorooctanoic acid (PFOA) surface

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Process simulation and economic analysis of reactor systems for perfluorinated compounds abatement without HF effluent

Boreum Lee,Sunggeun Lee,Ho Young Jung,Shin-Kun Ryi,Hankwon Lim

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 4, Pages 526-533 doi: 10.1007/s11705-016-1590-2

Abstract: New and efficient reactor systems were proposed to treat perfluorinated compounds via catalytic decomposition. One system has a single reactor (S-1), and another has a series of reactors (S-2). Both systems are capable of producing a valuable CaF and eliminating toxic HF effluent and their feasibility was studied at various temperatures with a commercial process simulator, Aspen HYSYS . They are better than the conventional system, and S-2 is better than S-1 in terms of CaF production, a required heat for the system, natural gas usage and CO emissions in a boiler, and energy consumption. Based on process simulation results, preliminary economic analysis shows that cost savings of 12.37% and 13.55% were obtained in S-2 at 589.6 and 621.4 °C compared to S-1 at 700 and 750 °C, respectively, for the same amount of CaF production.

Keywords： perfluorinated compounds (PFCs) CF₄ process simulation economic analysis

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Sorption enhanced catalytic CF

Jae-Yun Han, Chang-Hyun Kim, Boreum Lee, Sung-Chan Nam, Ho-Young Jung, Hankwon Lim, Kwan-Young Lee, Shin-Kun Ryi

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 4, Pages 537-544 doi: 10.1007/s11705-017-1651-1

Abstract: In this study, we developed a three-stage catalyst-adsorbent reactor for the catalytic hydrolysis of CF . Each stage is composed of a catalyst bed followed by an adsorbent bed using Ca(OH) to remove HF. The three stages are connected in series to enhance the hydrolysis of CF and eliminate a scrubber to dissolve HF in water at the same time. With a 10 wt-% Ce/Al O catalyst prepared by the incipient wetness method using boehmite and a granular calcium hydroxide as an adsorbent, the CF conversion in our proposed reactor was 7%–23% higher than that in a conventional single-bed catalytic reactor in the temperature range of 923–1023 K. In addition, experimental and numerical simulation (Aspen HYSYS ) results showed a reasonable trend of increased CF conversion with the adsorbent added and these results can be used as a useful design guideline for our newly proposed multistage reactor system.

Keywords： PFCs catalytic hydrolysis calcium hydroxide sorption enhanced process simulation