Kinetics and structural design of ZSM-5@SiC foam catalytic packing in RD column for ethyl levulinate synthesis

Ding, Qiuyan; Ping, Yan; Li, Hong; Chen, Zihao; Guan, Yanan; Jiao, Yilai; Zou, Jing; Gao, Xin

doi:10.1016/j.ces.2022.118258

Cited by 8 publications

(10 citation statements)

References 50 publications

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“…C 2 in the equation is 0.103, 40 and C 1 , m , and n are fitted with optimal constants of 0.16, 5, and 1, respectively. The comparison between the calculated value,

λ

and the experimental value 37 is shown in Figure 11F, and it can be found that the prediction model is in good agreement with the experimental results (The error is less than 5%). Moreover, we found that the larger the

D_{α}^{'}

, the better the dispersion, the larger the λ , the more favorable the reaction, the larger the

α

, the larger the porosity, the larger the reaction volume, and the larger the λ , the more favorable the reaction.…”

Section: Resultssupporting

confidence: 53%

“…The ordinate is the molar concentration of EL. While the mark is the experimental result, 37 the line is the optimal reaction rate k based on the experimental result (Equation ). Based on the k value, the conversion of LA in each period can be calculated and used as a verification of the simulation results.…”

Section: Resultsmentioning

confidence: 99%

“…However, the foam structure is significantly different from the packed bed, and the assumption based on a uniform spherical shape obviously does not apply to the foam structure. Therefore, this article introduces the structure factor (α) by analogy to Equation (37), and proposes the following expression for the pressure gradient.…”

Section: Pressure Drop Distributionmentioning

confidence: 99%

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Numerical analysis of reaction kinetic accompanying flow and dispersion in structured ZSM‐5@SiC open‐cell foam catalyst

et al. 2023

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Chaotic flow inside porous media accelerates the transport, mixing, and reaction of molecules and particles in widespread natural and factitious processes. Current macroscopic models based on the average pore-scale variations show obvious limitations in the prediction of many chemical processes. In this article, we reconstruct microscopic foam structures using micro-computed tomography to simulate fluid flow in structured ZSM-5@SiC foam catalyst. Moreover, we propose a conceptual model based on the microscopic mean square displacement theory to characterize the effective dispersion inside an open-cell foam. This model will explain the flow characteristics of confined fluid inside the porous media from fluid elements perspective. Particularly, dispersion factor and structure factor, as key parts of this model, perfectly interpret the driving characteristics of pressure drop, velocity different, and reaction in continuous foam media flow. This work also provides a unique means of predicting reaction kinetics of confined fluid in structured foam catalyst.

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“…C 2 in the equation is 0.103, 40 and C 1 , m , and n are fitted with optimal constants of 0.16, 5, and 1, respectively. The comparison between the calculated value,

λ

D_{α}^{'}

, the better the dispersion, the larger the λ , the more favorable the reaction, the larger the

α

, the larger the porosity, the larger the reaction volume, and the larger the λ , the more favorable the reaction.…”

Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Pressure Drop Distributionmentioning

confidence: 99%

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Numerical analysis of reaction kinetic accompanying flow and dispersion in structured ZSM‐5@SiC open‐cell foam catalyst

et al. 2023

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“…In addition to the catalysts, the structure and performance of the catalytic packings also have a great impact on the degree of reaction because of the different matching of catalytic reaction time and separation efficiency of different catalytic packings . In our group’s previous studies, seepage catalytic packing internal (SCPI) packing was researched with lower pressure drop and higher liquid holdup. , SCPI loaded ion-exchange resin catalyst has a fast reaction rate, long reaction time, and easy regulation which was widely used in esterification, transesterification, and so on, ,, but SCPI has low catalyst utilization and separation efficiency due to limited reaction space and gas–liquid mass transfer channels …”

Section: Introductionmentioning

confidence: 99%

“…28,29 SCPI loaded ion-exchange resin catalyst has a fast reaction rate, long reaction time, and easy regulation which was widely used in esterification, transesterification, and so on, 21,22,30 but SCPI has low catalyst utilization and separation efficiency due to limited reaction space and gas−liquid mass transfer channels. 31 In recent years, structured catalysts have become a hot spot in the RD research field due to their advantages of low pressure drop and good heat and mass transfer. 27,31 The previous research in our group focused on the silicon carbide (SiC) foam which is a popular material for manufacturing macroscopic cellular foams as catalyst supports due to the intrinsic properties of SiC such as good mechanical strength and thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Quantitative Matching Principle of Reaction and Distillation for the Reactive Distillation Process of Cyclohexyl Acetate Synthesis

Hou

Geng

Ding

et al. 2023

Ind. Eng. Chem. Res.

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The matching problem of reaction and separation in reactive distillation (RD) is an urgent problem, and the main reason for little relevant research is that there is no suitable RD for experiments. To understand the matching principle, this work designed KRD001#SCPI and HY@SiC catalytic packings, which tend to different coupling ratios of reaction and separation. The pilot-scale RD experiments and corresponding simulation of cyclohexyl acetate production were studied to verify matching coupling of different reaction RD requirements. Upon verification of this, conventional RD processes were considered from economic, environmental, and energy perspectives, and a new matching form of RD was further proposed based on uneven product distribution. For a ternary reaction system where product was heavy, product concentration moved downward, catalytic packings with high reaction rates were needed at lower reaction sections to avoid a reverse reaction, and those with high separation efficiency are needed at the upper section to separate product and reactants better.

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Synthesis of biomass‐derived ethyl levulinate from steam‐exploded corn straw

Zhao,

Jia,

Chen

et al. 2024

Asia-Pacific J Chem Eng

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Ethyl levulinate (EL) production from steam‐exploded corn straw (SCS) in a cascade of reaction using a Brønsted (B) acid and a Lewis (L) acid in ethanol was studied. The entangled structure of corn straw could be obviously damaged through steam explosion when the pressure was 1.5 MPa holding 10 min. The content of cellulose can be increased from 35.9% to 46.8%, and the contents of hemicellulose and lignin were changed from 16.7% to 8.8% and 22.6% to 27.5%, respectively. EL yield was significantly increased from 10.7 to 24.6 wt% under optimal reaction conditions (L/B = 1/20 [mol/mol], 205°C, 90 min, 1.8 g of SCS, 60 mL of ethanol). According to kinetic models, the activation energies for the main and side reactions were 56.8 and 110.5 kJ mol−1, respectively. It suggested that SCS was more easily to be converted to EL rather than other by‐products. The highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) energy gaps (HOMO‐LUMO gaps) of cellobiose over the mixed acids in ethanol were significantly reduced with frontier molecular orbital (FMO) theory. This work provides an effective strategy for EL production from agricultural waste straws.

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Kinetics and structural design of ZSM-5@SiC foam catalytic packing in RD column for ethyl levulinate synthesis

Cited by 8 publications

References 50 publications

Numerical analysis of reaction kinetic accompanying flow and dispersion in structured ZSM‐5@SiC open‐cell foam catalyst

Numerical analysis of reaction kinetic accompanying flow and dispersion in structured ZSM‐5@SiC open‐cell foam catalyst

Understanding the Quantitative Matching Principle of Reaction and Distillation for the Reactive Distillation Process of Cyclohexyl Acetate Synthesis

Synthesis of biomass‐derived ethyl levulinate from steam‐exploded corn straw

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