Piecewise loading bed for reversible adsorption of VOCs on silica gels

Wang, Zeli; He, Lin; Han, Zhong‐Jie; Li, Xingang

doi:10.1016/j.jtice.2019.05.025

Cited by 18 publications

(11 citation statements)

References 41 publications

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“…[ 19 ] Different from the microporous silica gel, the main adsorption process of o ‐xylene on the mesoporous silica gels contains surface adsorption and the capillary condensation process, especially at high saturation. [ 28 ] The breakthrough curves of SG A and SG B were measured under the same conditions (same adsorbent particle size and gas flow rate). The variation trend of the concentration front for the two different silica gels is mainly ascribed to the difference in mass transfer rate inside the adsorbent particles.…”

Section: Resultsmentioning

confidence: 99%

“…A similar conclusion can be drawn from the comparison of the k‐values of the fitting parameters of the Yoon‐Nelson model (the K value of the single SG B‐loaded fixed bed breakthrough curve is 0.0059 minute −1 ). [ 28 ] Increasing the loading ratio of SG A (from 20% to 80%) increased the slope of the breakthrough curve. Similar results were obtained from the Yoon‐Nelson model fitting K value in Table 3.…”

Section: Resultsmentioning

confidence: 99%

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Optimization of the loading patterns of silica gels for o‐xylene recovery by vacuum swing adsorption

Zheng

Wang

et al. 2020

Can J Chem Eng

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The key step for the adsorption-desorption engineering process is the reversible in-situ desorption of the adsorbent without VOCs (volatile organic compounds) accumulation. Our previous results show that the mesoporous silica gel performs well in adsorbing and desorbing the VOCs due to their capillary condensation in the mesopores. However, the microporous silica performs better in adsorbing though poorer in desorbing VOCs because of the direct interaction between VOCs molecules and the adsorbent wall in the micropores. Herein, the adsorption and desorption of o-xylene on two silica gels (SG) with different pore size distribution by vacuum swing adsorption (VSA) has been systematically studied. The equilibrium adsorption and desorption experiments of two kinds of silica gels at different loading heights in fixed bed show that the concentration front of o-xylene in microporous SG disperses slowly. However, the concentration front of o-xylene in mesoporous SG is significantly dispersed. To improve the overall efficiency of adsorptiondesorption, the mesoporous and microporous SGs are loaded together in the fixed bed. It was found that the increase in the microporous SG loading percentage facilitated the adsorption capacity but deteriorated its desorption efficiency, while the opposite occurs to the mesoporous SG. After optimization, it was observed that minimal energy consumption (1.295 kWh/m 3 VOCs gas) was used when the adsorption column is loaded with 60% SG B at the inlet and 40% of the SG A at the outlet end for o-xylene vapour adsorption. This finding will be useful for designing adsorbent loading in the adsorption column.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Optimization of the loading patterns of silica gels for o‐xylene recovery by vacuum swing adsorption

Zheng

Wang

et al. 2020

Can J Chem Eng

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“…The purification treatment of VOCs in the exhaust gas of the wood drying industry is very important. Commonly used purification methods are combustion method, [12] catalytic oxidation method, [13] condensation method, [14] adsorption method [15,16] . At present, the adsorption method has the advantages of high removal efficiency, thorough purification, low energy consumption, mature technology, recyclability, and convenient promotion, and has good environmental and economic benefits [17,18] …”

Section: Introductionmentioning

confidence: 99%

“…Commonly used purification methods are combustion method, [12] catalytic oxidation method, [13] condensation method, [14] adsorption method. [15,16] At present, the adsorption method has the advantages of high removal efficiency, thorough purification, low energy consumption, mature technology, recyclability, and convenient promotion, and has good environmental and economic benefits. [17,18] MOFs, [19][20][21][22] also known as coordination polymers (CPs), [23] are three-dimensional or two-dimensional porous materials based on the polymerization of metal ions and organic ligands, [24][25][26] is also a kind of new type of multifunctional crystal adsorption material.…”

Section: Introductionmentioning

confidence: 99%

An Investigation into the Effective Removal of VOCs Released from Wood Drying using Rare Metal‐Organic Frameworks

Zhang

et al. 2022

Zeitschrift anorg allge chemie

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This work reported the synthesis of Ce-MOF and Nd-MOF adsorption materials using the solvothermal method with the rare earth metals Ce 3 + and Nd 3 + as the particle center and discussed the adsorption effect of the two synthesized nanomaterials on the VOCs released by dry wood. The porous morphology of the material increases the benzene gas contact area. The maximum adsorption capacity of benzene, according to the Langmuir model, is 128.98 mg/g and 132.22 mg/g, respectively. The method has a large adsorption capacity, good adsorption effect, non-toxic and harmless, low recycling cost, recyclable multiple times, simple operation, stable structure, no secondary environmental pollution, etc., and has good application prospects in the wood drying industry.

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“…Different from the activated carbon and zeolite molecular sieve, silica gel is rich in hydroxyl on the surface. This property allows the silica gel to be potential candidate for the adsorption of OVOCs. − Therefore, in this study, the silica gel will be applied as the adsorbent for the enrichment of methanol and ethyl acetate.…”

Section: Introductionmentioning

confidence: 99%

Adsorption–Desorption Behaviors of Methanol and Ethyl Acetate on Silica Gel: Modeling and Experimental Tests

Zhang

Chen

et al. 2021

Ind. Eng. Chem. Res.

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Methanol and ethyl acetate are typical oxygen-containing volatile organic compounds which are widely used in industry, often leading to serious pollution. Herein, the adsorption−desorption hybrid process has been applied to recover and recycle the methanol and ethyl acetate waste gases using micro−mesoporous silica gel. Results show that compared with commercial activated carbons, the silica gels perform better (85%) in adsorbing the methanol and ethyl acetate due to their stronger affinity. Further tests show that competitive adsorption happens between them. The silica gel shows stronger affinity to ethyl acetate than to methanol. It is also found that an increase in the flow rate and concentration could facilitate the mass transfer of the substances in the pores of the silica gels. Based on the tests, an adsorption process simulation method with ideal adsorption solution theory and the linear driving force model has been applied to simulate the overshoot behaviors of breakthrough curves for the dynamic adsorption of this binary mixture on silica gels (error in ±7%). In this way, the concentration distribution of each adsorbed component on the solid phase in the adsorption bed has also been visualized and analyzed, which was validated by experimental tests. A dynamic adsorption model has been proposed to describe the adsorbed multicomponents on the solid phase for the adsorption of mixture. Finally, according to the adsorption and desorption profiles, a temperature swing−pressure swing combined process is proposed to desorb the adsorbed methanol−ethyl acetate mixture.

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Piecewise loading bed for reversible adsorption of VOCs on silica gels

Cited by 18 publications

References 41 publications

Optimization of the loading patterns of silica gels for o‐xylene recovery by vacuum swing adsorption

Optimization of the loading patterns of silica gels for o‐xylene recovery by vacuum swing adsorption

An Investigation into the Effective Removal of VOCs Released from Wood Drying using Rare Metal‐Organic Frameworks

Adsorption–Desorption Behaviors of Methanol and Ethyl Acetate on Silica Gel: Modeling and Experimental Tests

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