Process Intensification by Pulsations in Chemical Engineering: Some General Principles and Implementation

Абиев, Р. Ш.

doi:10.1021/acs.iecr.7b01339

Cited by 11 publications

(8 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Process intensification through the use of microchannel reactors will yield significant investment and operating cost savings for commercial applications [30,31]. In this context, the heat exchange within the system is very efficient, and operation with high heat fluxes is allowed [32,33].…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

et al. 2018

View full text Add to dashboard Cite

This paper addresses the issues related to the rapid production of hydrogen from methane steam reforming by means of process intensification. Methane steam reforming coupled with catalytic combustion in thermally integrated microchannel reactors for the production of hydrogen was investigated numerically. The effect of the catalyst, flow arrangement, and reactor dimension was assessed to optimize the design of the system. The thermal interaction between reforming and combustion was investigated for the purpose of the rapid production of hydrogen. The importance of thermal management was discussed in detail, and a theoretical analysis was made on the transport phenomena during each of the reforming and combustion processes. The results indicated that the design of a thermally integrated system operated at millisecond contact times is feasible. The design benefits from the miniaturization of the reactors, but the improvement in catalyst performance is also required to ensure the rapid production of hydrogen, especially for the reforming process. The efficiency of heat exchange can be greatly improved by decreasing the gap distance. The flow rates should be well designed on both sides of the reactor to meet the requirements of both materials and combustion stability. The flow arrangement plays a vital role in the operation of the thermally integrated reactor, and the design in a parallel-flow heat exchanger is preferred to optimize the distribution of energy in the system. The catalyst loading is an important design parameter to optimize reactor performance and must be carefully designed. Finally, engineering maps were constructed to design thermally integrated devices with desired power, and operating windows were also determined.

show abstract

Section: Introductionmentioning

confidence: 99%

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

et al. 2018

View full text Add to dashboard Cite

show abstract

“…An exhaustive effort has been made to summarize some salient works on the role of external forces in enhancing transport processes, as listed in Table . Most of the work has been done in the milli/microchannel by a few strategies including the use of ultrasound, electrokinetic effects, , pulsation, magnetohydrodynamic effects, and time pulsing …”

Section: Introductionmentioning

confidence: 99%

Vibration in Microchannel Causes Greater Enhancement of Mass Transfer in Toluene–Acetic Acid–Water System

Jaiswal

Kumar

Panda

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In recent times, microfluidic systems have emerged due to their multifunctional benefits including a higher degree of process intensification. The existence of the slug flow regime in the microdomain for biphasic flow systems further enhances the mass-transfer characteristics. In this Article, the combination of three enhancing factors, microdimension, slug flow, and mechanical vibration, is presented for a greater degree of process intensification. The effect of mechanical vibration on the hydrodynamics and mass-transfer characteristics of an immiscible liquid–liquid system in a microchannel with an internal diameter of 0.15 and 0.25 mm is investigated. Frequencies of 10 and 20 Hz are used to induce vibration in the microchannel. The result is shown to be a promising enhancement of the mass-transfer coefficient with the introduction of vibration. The range of slug flow is further enhanced due to the introduction of vibration along with a nearly three-fold mass-transfer enhancement owing to the increase in convective mass transport. A vibrational parameter is included in the study to calculate the stretched Reynolds number, which is found to increase with the introduction of vibration. The enhancement of mass transfer is attributed to the change in the flow pattern from a slug-dispersed transition and a slug-annular transition. The advancement of the vibration framework for effective fluid mixing will greatly affect the high-throughput separation process in the drug and fine synthetic industries.

show abstract

“…A control design scheme for maximizing the performance was proposed and verified by numerical solution of the reactor equations. This is an important aspect of process intensification [17,18]. This paper utilizes a nonlinear frequency response (NFR) method for analysis of the reactor performance in a reaction of photocatalytic decomposition of formic acid over a titania thin film catalyst.…”

Section: Introductionmentioning

confidence: 99%

Process Intensification in Photocatalytic Decomposition of Formic Acid over a TiO2 Catalyst by Forced Periodic Modulation of Concentration, Temperature, Flowrate and Light Intensity

et al. 2021

Self Cite

View full text Add to dashboard Cite

The effect of forced periodic modulation of several input parameters on the rate of photocatalytic decomposition of formic acid over a TiO2 thin film catalyst has been investigated in a continuously stirred tank reactor. The kinetic model was adopted based on the literature and it includes acid adsorption, desorption steps, the formation of photocatalytic active sites and decomposition of the adsorbed species over the active titania sites. A reactor model was developed that describes mass balances of reactive species. The analysis of the reactor was performed with a computer-aided nonlinear frequency response method. Initially, the effect of amplitude and frequency of four input parameters (flowrate, acid concentration, temperature and light intensity) were studied. All single inputs provided only a minor improvement, which did not exceed 4%. However, a modulation of two input parameters, inlet flowrate and the acid molar fraction, considerably improved the acid conversion from 80 to 96%. This is equivalent to a factor of two increase in residence time at steady-state operation at the same temperature and acid concentration.

show abstract

Process Intensification by Pulsations in Chemical Engineering: Some General Principles and Implementation

Cited by 11 publications

References 35 publications

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

RETRACTED: Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

Vibration in Microchannel Causes Greater Enhancement of Mass Transfer in Toluene–Acetic Acid–Water System

Process Intensification in Photocatalytic Decomposition of Formic Acid over a TiO2 Catalyst by Forced Periodic Modulation of Concentration, Temperature, Flowrate and Light Intensity

Contact Info

Product

Resources

About