Comparison of flow-reversal, internal-recirculation and loop reactors

Moshe Sheintuch; Olga Nekhamkina

doi:10.1016/j.ces.2004.04.037

Comparison of flow-reversal, internal-recirculation and loop reactors

Moshe Sheintuch^*, Olga Nekhamkina

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

In this work, we compare the performance of flow-reversal, internal-recirculation and loop reactors. In the absence of analytical results we use asymptotic, approximate and simulated solutions and present some experimental results. As criteria for comparison we use the maximal temperature achieved and the robustness of solution. Experiments and simulations of ethylene oxidation in the flow-reversal and internal-recirculation reactor, showed that the technically simpler inner-outer internal-recycle reactor may operate better at low flow rates than that with flow reversal, but the conclusion is reversed at high flow rates. Using approximate solutions, we show the dependence of the maximal temperature on the inner-outer heat-transfer coefficient. Loop reactor can generate rotating pulse solution; we simulate such solutions for two asymptotic cases where the ratio of switching velocity (i.e., unit length/switching time) to pattern velocity is either around unity or very large. We compare them with solutions of 4-8 units reactors. The slow-switching regimes require a delicate control. The fast-switching solution is robust but its peak temperature depends on the kinetic parameters and reactor length, compared with that of the flow-reversal reactor where it depends mainly on bed conductivity.

Original language	English
Pages (from-to)	4065-4072
Number of pages	8
Journal	Chemical Engineering Science
Volume	59
Issue number	19
DOIs	https://doi.org/10.1016/j.ces.2004.04.037
State	Published - Oct 2004
Externally published	Yes

Keywords

Countercurrent internal recirculation reactor
Experiments
Modeling
Reverse flow and loop reactors

Access to Document

10.1016/j.ces.2004.04.037

Cite this

@article{d874bf2cefea41ef8baa1c8671b25fab,

title = "Comparison of flow-reversal, internal-recirculation and loop reactors",

abstract = "In this work, we compare the performance of flow-reversal, internal-recirculation and loop reactors. In the absence of analytical results we use asymptotic, approximate and simulated solutions and present some experimental results. As criteria for comparison we use the maximal temperature achieved and the robustness of solution. Experiments and simulations of ethylene oxidation in the flow-reversal and internal-recirculation reactor, showed that the technically simpler inner-outer internal-recycle reactor may operate better at low flow rates than that with flow reversal, but the conclusion is reversed at high flow rates. Using approximate solutions, we show the dependence of the maximal temperature on the inner-outer heat-transfer coefficient. Loop reactor can generate rotating pulse solution; we simulate such solutions for two asymptotic cases where the ratio of switching velocity (i.e., unit length/switching time) to pattern velocity is either around unity or very large. We compare them with solutions of 4-8 units reactors. The slow-switching regimes require a delicate control. The fast-switching solution is robust but its peak temperature depends on the kinetic parameters and reactor length, compared with that of the flow-reversal reactor where it depends mainly on bed conductivity.",

keywords = "Countercurrent internal recirculation reactor, Experiments, Modeling, Reverse flow and loop reactors",

author = "Moshe Sheintuch and Olga Nekhamkina",

note = "Funding Information: This work was supported by the US-Israel Binational Scientific Foundation. MS is a member of the Minerva Center of Nonlinear Dynamics. ON is partially supported by the Center for Absorption in Science, Ministry of Immigrant Absorption State of Israel. ",

year = "2004",

month = oct,

doi = "10.1016/j.ces.2004.04.037",

language = "英语",

volume = "59",

pages = "4065--4072",

journal = "Chemical Engineering Science",

issn = "0009-2509",

publisher = "Elsevier BV",

number = "19",

}

TY - JOUR

T1 - Comparison of flow-reversal, internal-recirculation and loop reactors

AU - Sheintuch, Moshe

AU - Nekhamkina, Olga

N1 - Funding Information: This work was supported by the US-Israel Binational Scientific Foundation. MS is a member of the Minerva Center of Nonlinear Dynamics. ON is partially supported by the Center for Absorption in Science, Ministry of Immigrant Absorption State of Israel.

PY - 2004/10

Y1 - 2004/10

N2 - In this work, we compare the performance of flow-reversal, internal-recirculation and loop reactors. In the absence of analytical results we use asymptotic, approximate and simulated solutions and present some experimental results. As criteria for comparison we use the maximal temperature achieved and the robustness of solution. Experiments and simulations of ethylene oxidation in the flow-reversal and internal-recirculation reactor, showed that the technically simpler inner-outer internal-recycle reactor may operate better at low flow rates than that with flow reversal, but the conclusion is reversed at high flow rates. Using approximate solutions, we show the dependence of the maximal temperature on the inner-outer heat-transfer coefficient. Loop reactor can generate rotating pulse solution; we simulate such solutions for two asymptotic cases where the ratio of switching velocity (i.e., unit length/switching time) to pattern velocity is either around unity or very large. We compare them with solutions of 4-8 units reactors. The slow-switching regimes require a delicate control. The fast-switching solution is robust but its peak temperature depends on the kinetic parameters and reactor length, compared with that of the flow-reversal reactor where it depends mainly on bed conductivity.

AB - In this work, we compare the performance of flow-reversal, internal-recirculation and loop reactors. In the absence of analytical results we use asymptotic, approximate and simulated solutions and present some experimental results. As criteria for comparison we use the maximal temperature achieved and the robustness of solution. Experiments and simulations of ethylene oxidation in the flow-reversal and internal-recirculation reactor, showed that the technically simpler inner-outer internal-recycle reactor may operate better at low flow rates than that with flow reversal, but the conclusion is reversed at high flow rates. Using approximate solutions, we show the dependence of the maximal temperature on the inner-outer heat-transfer coefficient. Loop reactor can generate rotating pulse solution; we simulate such solutions for two asymptotic cases where the ratio of switching velocity (i.e., unit length/switching time) to pattern velocity is either around unity or very large. We compare them with solutions of 4-8 units reactors. The slow-switching regimes require a delicate control. The fast-switching solution is robust but its peak temperature depends on the kinetic parameters and reactor length, compared with that of the flow-reversal reactor where it depends mainly on bed conductivity.

KW - Countercurrent internal recirculation reactor

KW - Experiments

KW - Modeling

KW - Reverse flow and loop reactors

UR - http://www.scopus.com/inward/record.url?scp=4444331933&partnerID=8YFLogxK

U2 - 10.1016/j.ces.2004.04.037

DO - 10.1016/j.ces.2004.04.037

M3 - 文章

AN - SCOPUS:4444331933

SN - 0009-2509

VL - 59

SP - 4065

EP - 4072

JO - Chemical Engineering Science

JF - Chemical Engineering Science

IS - 19

ER -

Comparison of flow-reversal, internal-recirculation and loop reactors

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this