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탄산화 및 저온 결정화를 통한 나트륨 농축수로부터 나트륨 화합물 합성
이승우,채수천,방준환,Lee, Seung-Woo,Chae, Soochun,Bang, Jun-Hwan 한국자원리싸이클링학회 2020 資源 리싸이클링 Vol.29 No.4
Carbonation (step I) and cryo-crystallization (crystallization at low temperature) (step II) were performed to synthesize Na compounds from sodium concentrated solution. In the step 1, the solubility and pH of carbon dioxide (95 wt.%) affecting carbonation could be changed by the variation of reaction temperature. The step II was performed at 2 ℃ after carbonation. The injection of carbon dioxide was carried out twice for the stable production and the saturated solubility of carbonate ions in solution. Firstly, we tried to inject CO<sub>2</sub> for controlling the solubility of CO<sub>2</sub> by changing the reaction temperature from 35 ℃ to 10 ℃, and the second injection was aimed at 10 ℃ for inducing nucleation of Na compound through carbonation after NaCl solution addition. In the cryo-crystallization step, the crystal growth of Na compounds could be induced by slowing the carbonation rate through reaction temperature change from 10 ℃ to 2 ℃. In this study, the effect on NaOH concentration was examined and the purity of Na compound was increased when 2M NaOH was used. In addition, the synthesized Na compounds were mostly rod-shaped and consisted of sodium carbonate or sodium carbonate with monohydrate.
고압 유체 시료의 pH 및 알칼리도 측정 방법 : 가상 시료를 활용한 실용성 평가
송민석,문수현,채기탁,방준환,Minseok Song,Soohyeon, Moon,Gitak Chae,Jun-Hwan Bang 한국지하수토양환경학회 2024 지하수토양환경 Vol.29 No.1
As part of monitoring technology aimed at verifying the stability of CO<sub>2</sub> geologic storage and mitigating concerns about leakage, a method for measuring the pH and alkalinity of high-pressure fluid samples was established to obtain practical technology. pH measurement for high-pressure samples utilized a high-pressure pH electrode, and alkalinity was measured using the Gran titration method for samples collected with a piston cylinder sampler (PCS). Experimental samples, referencing CO<sub>2</sub>-rich water and CO<sub>2</sub> geologic storage studies, were prepared in the laboratory. The PCS controls the piston, preventing CO<sub>2</sub> degassing and maintaining fluid pressure, allowing mixing with KOH to fix dissolved CO<sub>2</sub>. Results showed a 6.1% average error in high-pressure pH measurement. PCS use for sample collection maintained pressure, preventing CO<sub>2</sub> degassing. However, PCS-collected sample alkalinity measurements had larger errors than non-PCS measurements, limiting PCS practicality in monitoring field settings. Nevertheless, PCS could find utility in preprocessing for carbon isotope analysis and other applications. This research not only contributes to the field of CCS monitoring but also suggests potential applications in studies related to natural analogs of CCS, CO<sub>2</sub>-rock interaction experiments, core flooding experiments, and beyond.