Aqueous hydrazine as a promising candidate for capturing carbon dioxide

Lee, Kyu Hyoung; Lee, Byeongno; You, Jong Kyun; Park, Ki Tae; Baek, Il Hyun; Hur, Nam Hwi

doi:10.1016/j.ijggc.2014.08.018

Cited by 19 publications

(12 citation statements)

References 45 publications

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“…The recalculated values of wetted-wall column tests are 0.03469-0.2658 1/s [13] and 0.02551-0.4336 1/s [26], respectively; while the recalculated values for packed column are in the range of 0.486-2.43 1/s [8] when a specific area of packings, 500 m 2 /m 3 , is available. Moreover, the K G a is 2.21 1/s when using aqueous hydrazine solvent [27]. …”

Section: Effect Of Process Variables On the R A And K G Amentioning

confidence: 95%

“…Some of these values are higher than that reported in here, 3.21 × 10 −4 -1.10 × 10 −3 mol/(L·s). In addition, the higher RA (2.07 × 10 −3 -7.24 × 10 −3 mol/(L·s)) can be obtained when aqueous hydrazine is used as a solvent for CO2 capture [27].…”

Section: Effect Of Process Variables On the Ra And Kgamentioning

confidence: 99%

“…However, the K G a, as obtained here, is in the range of 0.0136-0.3302 1/s, which is comparable with other solvents, such as MEA solvent which is in the range of 0.0342-0.881 1/s [28] and NaOH/BaCl 2 /H 2 O, which is in the ranges of 0.0651-0.3396 1/s [5] and 0.015-0.14 1/s for a stirred-tank scrubber using an aqueous ammonia solution as the scrubbing solution [4]. On the other hand, from data reported in literatures [8,13,26,27], the K G a can be recalculated for comparison. The recalculated values of wetted-wall column tests are 0.03469-0.2658 1/s [13] and 0.02551-0.4336 1/s [26], respectively; while the recalculated values for packed column are in the range of 0.486-2.43 1/s [8] when a specific area of packings, 500 m 2 /m 3 , is available.…”

Section: Effect Of Process Variables On the R A And K G Amentioning

confidence: 99%

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CO2 Capture and Crystallization of Ammonia Bicarbonate in a Lab-Scale Scrubber

Chen

2018

Crystals

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A lab-scale bubble-column scrubber is used to capture CO 2 gas and produce ammonia bicarbonate (ABC) using aqueous ammonia as an absorbent under a constant pH and temperature. The CO 2 concentration is adjusted by mixing N 2 and CO 2 in the range of 15-60 vol % at 55 • C. The process variables are the pH of the solution, temperature, gas-flow rate and the concentration of gas. The effects of the process variables on the removal efficiency (E), absorption rate (R A ) and overall mass-transfer coefficient (K G a) were explored. A multiple-tube mass balance model was used to determine R A and K G a, in which R A and K G a were in the range of 2.14 × 10 −4 -1.09 × 10 −3 mol/(s·L) and 0.0136-0.5669 1/s, respectively. Results found that, R A showed an obvious increase with the increase in pH, inlet gas concentration and gas temperature, while K G a decreased with an increase in inlet gas concentration. Using linear regression, an empirical expression for K G a/E was obtained. On the other hand, ammonia bicarbonate crystals could be produced at a pH of 9.5 when the gas concentration was higher than 30% and γ (=F g /F A , the gas-liquid molar flow rate ratio) ≥ 1.5.

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Section: Effect Of Process Variables On the R A And K G Amentioning

confidence: 95%

Section: Effect Of Process Variables On the Ra And Kgamentioning

confidence: 99%

Section: Effect Of Process Variables On the R A And K G Amentioning

confidence: 99%

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CO2 Capture and Crystallization of Ammonia Bicarbonate in a Lab-Scale Scrubber

Chen

2018

Crystals

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“…More than 1000 factories have developed the alkanolamine processes over the past few decades, among which the monoethylamine (MEA) process has the advantages in terms of price, characteristics, and recovery, although, it still consumes energy during recovery and brings cost burdens due to the treatment of concentrated CO 2 [5]. To develop an energy-saving process, new solvents [6][7][8][9][10], and new processes [11,12] have been proposed and explored to find a process with a lower regeneration energy requirement. Some of them studied the absorption kinetics of the mixed solvents [9,13,14].…”

Section: Introductionmentioning

confidence: 99%

CO2 Capture in A Bubble-Column Scrubber Using MEA/CaCl2/H2O Solution—Absorption and Precipitation

Chen

Zhuo

2020

Crystals

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This study used the solvent monoethylamine (MEA)/CaCl2/H2O to investigate CO2 absorption and CaCO3 crystallization in a bubble column scrubber. The variables explored were pH, gas flow rate, gas concentration, the liquid flow rate of the solution to absorb CO2, and CaCO3 crystallization. Under a continuous mode, the solution of CaCl2 was fed continuously, and the pH dropped after CO2 absorption. To maintain the set pH value, there was an automatic input of the MEA solvent into the bubble column. In addition to maintaining the pH, the solution could also absorb CO2 and produce CaCO3 crystals, which served two purposes. The results showed that there were mainly vaterite crystals. At different pH values, the lower the pH, the higher the precipitation rate of vaterite (Fp), and vice versa. However, under different gas flow rates, the Fp decreased as the pH value increased. Additionally, the process variables also affected the absorption rate (RA) and the overall mass-transfer coefficient (KGa) generally increased with increasing pH, gas concentration, and gas flow rate. However, it slowed down under operating conditions at high pH and high gas flow rate. Finally, correlation equations for RA, KGa, and Fp were also obtained and discussed in the study.

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“…This causes a serious environmental problem because CO 2 is generally accepted as a greenhouse gas with significant contribution to global warming (Hasib-urRahman et al, 2010;Zhang et al, 2012;Karadas et al, 2010;Lee et al, 2014). The Intergovernmental Panel on Climate Change (IPCC) perceives that by the year 2100, there may be a rise of 1.9 • C in the global temperature with many anticipated distresses (Stewart and Hessami, 2005).…”

Section: Introductionmentioning

confidence: 99%