A wet process for oxidation-absorption of nitric oxide by persulfate/calcium peroxide

Wang, Zhiping; Zhang, Yanguo; Tan, Zhongchao

doi:10.1016/j.cej.2018.05.145

Cited by 33 publications

(10 citation statements)

References 36 publications

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“…The feed gas flow rate ranged from 0.05 to 0.25 L/min at a temperature of 323 K. In the present study, the highest absorption efficiency was 94.6% at 0.1 L/min gas flow rate, with a membrane module with 48 fibers, while Wang and Yu (2017) stated the maximum absorption in hydrophobic polypropylene hollow fiber membrane modules with 3000 fibers was ~92% at a 0.05 L/min feed gas flow rate. However, in a wet process of oxidation-absorption in a bubble reactor, the maximum conversion was found to be as high as 94.5% using Na2S2O8 and CaO2 as the oxidants to remove 345 ppm NOx with a feed gas flow rate of 2 L/min (Wang et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

The Effect of the Number of Fibers in Hollow Fiber Membrane Modules for NOx Absorption

Kartohardjono¹,

Rizky

Karamah³

et al. 2020

IJTech

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As a type of gas that contributes to air pollution, nitrogen oxide (NOx) has harmful effects on humans and the environment. Among several types of NOx, nitric oxide (NO) and nitrogen dioxide (NO2) are most commonly found in air. The utilization of membranes as reactors is a system that combines chemical reactions with the separation process through membranes to increase the conversion of the reaction. This study investigated the absorption process by utilizing a hollow fiber membrane module (polysulfone) as a bubble reactor with H2O2 (0.5 wt.%) and HNO3 (0.5M) as the absorbent. NOx feed gas was flown into the tube side of the membrane; the shell side was filled with static H2O2 and HNO3 and the shell input and the tube output flow were closed to create gas bubbles. The experimental results showed that the absorption efficiency increased, but the mass transfer coefficient and flux decreased as the number of fibers in the membrane module increased at the same feed gas flow rate. The NOx loading is relatively constant as the amount of fiber in the membrane module increased at the same feed gas flow rate. The experimental results also showed that the mass transfer coefficient, flux, and NOx loading increased with increasing feed gas flow rate, but the absorption efficiency decreased when using the same number of fibers in the membrane module. The maximum NOx absorption efficiency achieved in this study was 94.6% at the feed gas flow rate of 0.1 L/min, using a membrane module with 48 fibers.

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Section: Resultsmentioning

confidence: 99%

The Effect of the Number of Fibers in Hollow Fiber Membrane Modules for NOx Absorption

Kartohardjono¹,

Rizky

Karamah³

et al. 2020

IJTech

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“…The results showed that the highest NO removal efficiency of 82% at pH 11. Their subsequent investigation into NO removal using a Na 2 S 2 O 8 /CaO 2 solution discovered that the removal efficiency first increased rapidly and then slowed [7]. Hao et al [8] developed an AOPs system to remove SO 2 and NO simultaneously and achieved an efficiency of 87.8% NO reduction under optimal operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor

Yuan

2021

Membranes

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A numerical study on the oxidation removal of nitric oxide in a ceramic hollow fiber membrane contactor was performed. To represent the transport and absorption process, the model was created by combining multiphase, species, reaction, and porous models. The numerical results were verified by comparing them with experimental data. The tube and lumen sides both have laminar parabolic velocity distributions. The nitric oxide concentration decreases gradually from the membrane wall to axis at the cross-section except on the inner and outer sides of the membrane tube. The equivalent diffusion length was proved useful for evaluating the entrance effect. At low concentrations, the reduction efficiency was proportional to the absorbent concentration, and at large concentrations, it neared a maximum value. The reduction efficiency was positively affected by elevated operating temperature and pressure. With a gas channel width of 13 mm, the reduction flow rate achieves its maximum. The efficiency of NO reduction per area decreases as the effective membrane length increases. Increasing the operating temperature and membrane length are recommended as design priorities due to high relative enhancements. It is not recommended to improve reduction efficiency by increasing membrane tube diameter and operating pressure in design. Changing the gas flow rate, absorbent concentration and gas channel width are moderate recommended as well.

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“…The selective catalytic reduction (SCR) and selective noncatalytic reduction (SNCR) technologies are adopted for NO removal [6], while the wet flue gas desulfurization (WFGD) technology using calcium based solution is adopted for SO 2 removal [7]. In the flue gas, NO accounts for more than 90% of the NO x [8], and is insoluble in aqueous solution. Thereupon, oxidizing insoluble NO to soluble NO 2 before wet scrubbing method is necessary.…”

Section: Introductionmentioning

confidence: 99%

Removal and recovery of SO₂ and NO in oxy-fuel combustion flue gas by calcium-based slurry

Cai

Ding

et al. 2020

E3S Web Conf.

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This study investigates the use of calcium-based slurry for simultaneous removal NO and SO2 from oxy-fuel combustion flue gas, and recovery of the sulfur and nitrogen species in resulting solutions. The experiments were performed in a bubbling reactor in a transient mode under the pressure of 20 bar. The various influencing factors including the CaO amount, carrier gas (N2/CO2), and absorption time on the simultaneous NO and SO2 removal process, and the solution products were studied comprehensively. The results show that the NO2 removal efficiency can be improved by the presence of CO2, and the gas phase HNO2 produces in this process. The addition of CaO has positive effects not only on the NO2 removal efficiency but also on the formation of stable HNO3. With the presence of CO2, CaCO3 is formed in a solution initially. With the decrease of pH, CaCO3 is gradually converted to CaSO4, and in particular CaCO3 can be fully avoided through decreasing the pH of an absorption solution to 1.14. At the same time, the formation of unstable S(IV) and NO2- can be prevented when the solution pH is lower than 1.37. The nitrogen and sulfur compounds in the absorption solution (at pH 1.14) were further separated by the addition of different amounts of CaO. In particular, 95% of SO42- finally can be recovered in the form of CaSO4.2H2O with nitrogen in solution existing as NO3- by controlling the Ca/S ratio at 4.70. The effectiveness of calcium-based slurry on the removal and recovery of SO2 and NO is confirmed.

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A wet process for oxidation-absorption of nitric oxide by persulfate/calcium peroxide

Cited by 33 publications

References 36 publications

The Effect of the Number of Fibers in Hollow Fiber Membrane Modules for NOx Absorption

The Effect of the Number of Fibers in Hollow Fiber Membrane Modules for NOx Absorption

Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor

Removal and recovery of SO₂ and NO in oxy-fuel combustion flue gas by calcium-based slurry

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A wet process for oxidation-absorption of nitric oxide by persulfate/calcium peroxide

Cited by 33 publications

References 36 publications

The Effect of the Number of Fibers in Hollow Fiber Membrane Modules for NOx Absorption

The Effect of the Number of Fibers in Hollow Fiber Membrane Modules for NOx Absorption

Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor

Removal and recovery of SO2 and NO in oxy-fuel combustion flue gas by calcium-based slurry

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Product

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Removal and recovery of SO₂ and NO in oxy-fuel combustion flue gas by calcium-based slurry