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Determining Effective Parameters on Hydrodynamic Characteristics of Pulsed Packed Column Using ANOVA Method: Determining Optimum Conditions with Maximum Extraction Efficiency | ||
| Journal of Heat and Mass Transfer Research | ||
| دوره 8، شماره 2 - شماره پیاپی 16، دی 2021، صفحه 267-281 اصل مقاله (2.47 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2021.23601.1347 | ||
| نویسندگان | ||
| Mohammad Ghazvehi1؛ Masoud Nasiri* 1؛ Mohammad Hasan Mallah2؛ Jaber Safdari2 | ||
| 1Faculty of Chemical, Petroleum and Gas Engineering, Semnan University, Semnan | ||
| 2Material and Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, Iran | ||
| تاریخ دریافت: 16 خرداد 1400، تاریخ بازنگری: 12 مهر 1400، تاریخ پذیرش: 18 مهر 1400 | ||
| چکیده | ||
| Using nanoparticles can lead to an increase in mass transfer rate in liquid–liquid extraction systems. Increasing the concentration of nanoparticles in liquids results in the deposition of nanoparticles and thus limits its use in extraction systems. In this paper, the effect of adding a surfactant to nanoparticle in liquid-liquid extraction systems on extraction efficiency is investigated. The effect of surfactant concentration on the extraction efficiency has been investigated both separately and in the presence of nanoparticles. In this research, the effect of continuous and dispersed phase velocity, and pulsation intensity on the hydrodynamic characteristics of the system has been investigated for the first time with the simultaneous use of silica nanoparticles and SDS surfactant in the vertical pulsed packed column. Using hydrodynamic system and in the presence of nanoparticles and surfactant, this research article provides optimum conditions to obtain maximum efficiency with minimum additives and pulsation intensity. ANOVA analysis (three-level Box–Behnken experimental design) has been used to investigate the effective parameters and sensitivity analysis. The results showed that pulsation intensity is the most effective factor on response. With increasing pulsation intensity from 1 to 2.5, the droplet size decreases and hold-up is increased from 0.02 to 0.05 (at Qd=Qc= 2 lit/s) in the system. Also, the effects of adding SiO2 nanoparticles and Sodium dodecyl sulfate (SDS) surfactant into a chemical system on the hydrodynamic characteristics were studied. The results showed that by adding nanoparticles the droplet size decreases while hold-up increases. Finally, a semi-empirical correlation has been proposed to predict the droplet size in terms of operational parameters, the system chemical properties and the nanoparticle volume fraction. It was found that when pulsation intensity, nanoparticle concentration and surfactant concentration were 1.75, 0.1, and 0.05, respectively, extraction efficiency increased to 0.98. | ||
| کلیدواژه‌ها | ||
| Nanoparticle؛ surfactant؛ Pulsed packed column؛ Mass transfer coefficient؛ Hold-up؛ Liquid-liquid extraction | ||
| عنوان مقاله [English] | ||
| تعیین پارامترهای موثر بر مشخصه های هیدرودینامیکی ستون ضربه ای پر شده با استفاده از روش تحلیل ANOVA : تعیین شرایط بهینه با بالا ترین بازده جداسازی | ||
| چکیده [English] | ||
| استفاده از نانوذرات می‌تواند میزان انتقال جرم در سیستم های جداسازی مایع -مایع را افزایش دهد. افزایش غلظت نانوذرات در مایعات سبب از هم گسیختگی نانوذرات گردیده و در نتیجه استفاده از این سیستم های جداسازی را محدود می‌سازد. در این مقاله تاثیر اضافه نمودن سورفکتانت و نانو ذرات بر ضریب جداسازی در سیستم های جداسازی مایع - مایع بررسی گردید. تاثیر غلظت سورفکتانت نیز بر ضریب جداسازی به طور جداگانه با حضور و بدون حضور نانوذرات بررسی گردید. در این تحقیق همچنین تاثیر شدت جریان فاز مداوم و پخش شده و شدت ضربه روی مشخصه های هیدرو دینامیکی سیستم با استفاده هم‌زمان از نانو ذرات سیلیکا و سورفکتانت SDS در یک ستون پرشده عمودی برای اولین بار مورد بررسی قرار گرفت. این مقاله با استفاده از سیستم هیدرودینامیکی و با حضور نانو ذرات و سورفکتانت، شرایط بهینه ای را برای دستیابی به بالاترین راندمان با حداقل افزودنی ها و شدت ضربه فراهم می‌کند. از آنالیز ANOVA (طراحی آزمایش سه سطحی Box-Behnken) جهت بررسی اثر پارامترها و تحلیل حساسیت استفاده گردید. نتایج نشان داد که شدت ضربه مهمترین پارامتر موثر بر پاسخ می باشد. با افزایش شدت ضربه از ۱ تا 5/2، سایز قطره کاهش یافته و هلد آپ از 02/0تا 05/0 (در (Qd=Qc=2 lit/s در سیستم افزایش می یابد. همچنین اثر اضافه نمودن نانوذرات SiO2 و سورفکتانت SDS به سیستم شیمیایی بر روی پارامترهای هیدرودینامیکی مطالعه گردید . نتایج نشان داد که با اضافه نمودن نانوذرات اندازه ذرات کاهش می یابد در حالی که هلد آپ افزایش می یابد. در پایان یک رابطه نیمه تجربی برای پیش بینی اندازه قطره بر حسب پارامترهای عملیاتی و خواص شیمیایی سیستم و کسر حجمی نانوذرات ارائه گردید . این رابطه مشخص می‌کند زمانی که شدت ضربه ، غلظت نانوذره و غلظت سورفکتانت به ترتیب برابر با 75/1 و 1/0 و 05/0 باشند، بازده استخراج تا 98/0 افزایش می‌یابد . | ||
| کلیدواژه‌ها [English] | ||
| نانوذره, ماده فعال سطحی, ستون ضربه‌ای پر شده, ضریب انتقال جرم, هلدآپ, استخراج مایع-مایع | ||
| مراجع | ||
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