Optimal synthesis of periodic sorption enhanced reaction processes with application to hydrogen production

Arora, Akhil; Bajaj, Ishan; Iyer, Shachit S.; Hasan, M. M. Faruque

doi:10.1016/j.compchemeng.2018.04.004

Cited by 30 publications

(28 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The PSA process model is optimized using the two-phase algorithm by Bajaj et al 30 , and more details regarding the simulation-based optimization model can be found elsewhere 21 . For PSA-based MOC unit optimization, the objective function is either the maximization of oxygen recovery or minimization of BSF.…”

Section: Methodsmentioning

confidence: 99%

“…The pressure of each of PSA cyclic steps is varied between − 3.5 and 3.5 bar. It should be noted that the negative pressure signs are an abstract concept, introduced earlier in Arora et al 21 , that help us in simultaneously optimizing both operating pressure and cycle design of PSA systems. To result in shorter PSA cycles, the step duration can vary between 1 and 10 s. Additional constraints are imposed in the overall optimization model to ensure that the duration of pressurization steps (i.e., pressurization and depressurization) hit the lower bound of 1 s, thereby resulting in a majority of cycle time spent during production and/or purging steps.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Flexible oxygen concentrators for medical applications

Arora

Hasan

2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

Medical oxygen concentrators (MOCs) are used for supplying medical grade oxygen to prevent hypoxemia-related complications related to COVID-19, chronic obstructive pulmonary disease (COPD), chronic bronchitis and pneumonia. MOCs often use a technology called pressure swing adsorption (PSA), which relies on nitrogen-selective adsorbents for producing oxygen from ambient air. MOCs are often designed for fixed product specifications, thereby limiting their use in meeting varying product specifications caused by a change in patient’s medical condition or activity. To address this limitation, we design and optimize flexible single-bed MOC systems that are capable of meeting varying product specification requirements. Specifically, we employ a simulation-based optimization framework for optimizing flexible PSA- and pressure vacuum swing adsorption (PVSA)-based MOC systems. Detailed optimization studies are performed to benchmark the performance limits of LiX, LiLSX and 5A zeolite adsorbents. The results indicate that LiLSX outperforms both LiX and 5A, and can produce 90% pure oxygen at 21.7 L/min. Moreover, the LiLSX-based flexible PVSA system can manufacture varying levels of oxygen purity and flow rate in the range 93–95.7% and 1–15 L/min, respectively. The flexible MOC technology paves way for transitioning to an envisioned cyber-physical system with real-time oxygen demand sensing and delivery for improved patient care.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Flexible oxygen concentrators for medical applications

Arora

Hasan

2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hence, a reduction in the pressure can be used to regenerate the sorption catalyst when it is saturated (pressure swing adsorption/reaction) . The principle of sorption enhancement has been reported in several theoretical studies . This work investigates the sorption‐enhanced methanol reaction at typical conditions and derives the parameters relevant for a future technical realization.…”

Section: Introductionmentioning

confidence: 99%

Sorption‐Enhanced Methanol Synthesis

et al. 2019

View full text Add to dashboard Cite

A small heat of reaction limits the efficiency of the catalytic hydrogenation of CO2 to form methanol; an improved efficiency can be achieved by shifting the thermodynamic equilibrium toward the formation of methanol. The exothermic adsorption of the products in sorption catalysts is shown to increase the reaction yield. The sorption catalysts consist of catalytically active Cu particles incorporated into a zeolite, which is known to strongly absorb water. In addition to high reaction yield of methanol, the sorption catalyst reduces CO2 to CO and dimethyl ether. An enhancement factor of up to 400% for CO and 130% for methanol and dimethyl ether at a relatively low pressure of 15 bar is shown. Furthermore, the following relevant parameters for future technical realization are derived: a high catalytic activity and the reversible adsorption of the products at reaction conditions. A key experiment that combines a catalytic reaction and a pressure swing desorption is presented and demonstrates the feasibility of sorption‐enhanced catalysis for efficient energy use in large‐scale reactors.

show abstract

“…The traditional design practices consider designing one process at a time . In doing so, they are not able to benefit from the economies of equipment numbers.…”

Section: Discussionmentioning

confidence: 99%

Design standardization of unit operations for reducing the capital intensity and cost of small‐scale chemical processes

Arora

Zantye

et al. 2019

AIChE Journal

Self Cite

View full text Add to dashboard Cite

A methodology is proposed to reduce the cost and capital intensity of small-scale chemical processes by creating new opportunities for economies of numbers through standardizing the equipment designs across multiple processes. We depart from asynchronous design of single-processes and adopt a common-functionality based simultaneous design of multiple processes that use similar unit operations. A generalized cost function is used to appropriately balance the trade-offs between economies of scale and economies of numbers. An optimization-based framework for design standardization is developed and illustrated using two case studies. The first involves the simultaneous synthesis of methanol and ammonia processes, and the second addresses the optimal synthesis of multi-column natural gas liquid (NGL) fractionation processes for different natural gas sources. We observe that considerable reduction in capital intensity of small-scale processes is possible through equipment standardization.

show abstract

Optimal synthesis of periodic sorption enhanced reaction processes with application to hydrogen production

Cited by 30 publications

References 51 publications

Flexible oxygen concentrators for medical applications

Flexible oxygen concentrators for medical applications

Sorption‐Enhanced Methanol Synthesis

Design standardization of unit operations for reducing the capital intensity and cost of small‐scale chemical processes

Contact Info

Product

Resources

About