Magnetic resonance imaging of single- and two-phase flow in fixed-bed reactors

被引：17

作者：

Gladden, LF ^{[1
]}

Mantle, MD ^{[1
]}

Sederman, AJ ^{[1
]}

Yuen, EHL ^{[1
]}

机构：

[1] Univ Cambridge, Dept Chem Engn, Cambridge CB2 3RA, England

来源：

APPLIED MAGNETIC RESONANCE | 2002年 / 22卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1007/BF03166103

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

Magnetic resonance imaging and flow visualization techniques are increasingly used to study transport processes in chemical and biochemical reactors. Three recent case studies from our own research program are reported, each illustrating quite different applications of magnetic resonance techniques in such applications. First, two-phase flow in a trickle-bed reactor is considered. Images of the steady-state gas-liquid distribution are obtained which yield quantitative measures of liquid holdup and wetting efficiency. Second, a radiofrequency pulse sequence based on that for rapid acquisition with relaxation enhancement is used to perform ultrafast visualization of gas-liquid flow in individual channels within a ceramic monolith. Finally, H-1 volume-selective nuclear magnetic resonance spectroscopy is employed to perform an in situ spatially resolved study of the extent of conversion of the liquid-phase esterification reaction of methanol and acetic acid, catalyzed by an acid catalyst (Amberlyst 15 ion exchange resin) in a fixed-bed reactor. In particular, the effect of the superficial flow rate of the feed on conversion is investigated.

引用

页码：201 / 212

页数：12

共 19 条

[1] SNAPSHOT FLASH MRI - APPLICATIONS TO T1, T2, AND CHEMICAL-SHIFT IMAGING [J].

HAASE, A .

MAGNETIC RESONANCE IN MEDICINE, 1990, 13 (01) :77-89

[2] RARE IMAGING - A FAST IMAGING METHOD FOR CLINICAL MR [J].

HENNIG, J ;

NAUERTH, A ;

FRIEDBURG, H .

MAGNETIC RESONANCE IN MEDICINE, 1986, 3 (06) :823-833

[3] Local transitions in flow phenomena through packed beds identified by MRI [J].

Johns, ML ;

Sederman, AJ ;

Bramley, AS ;

Gladden, LF ;

Alexander, P .

AICHE JOURNAL, 2000, 46 (11) :2151-2161

[4] VOLUME-SELECTIVE MULTIPULSE SPIN-ECHO SPECTROSCOPY [J].

KIMMICH, R ;

HOEPFEL, D .

JOURNAL OF MAGNETIC RESONANCE, 1987, 72 (02) :379-384

[5] Thermally polarized 1H NMR microimaging studies of liquid and gas flow in monolithic catalysts [J].

Koptyug, IV ;

Altobelli, SA ;

Fukushima, E ;

Matveev, AV ;

Sagdeev, RZ .

JOURNAL OF MAGNETIC RESONANCE, 2000, 147 (01) :36-42

[6]

MANTLE MD, IN PRESS AICHE J

[7] Mapping flow and dispersion in a packed column by MRI [J].

Park, J ;

Gibbs, SJ .

AICHE JOURNAL, 1999, 45 (03) :655-660

[8] Study of biofilm within a packed-bed reactor by three-dimensional magnetic resonance imaging [J].

Paterson-Beedle, M ;

Nott, KP ;

Macaskie, LE ;

Hall, LD .

MICROBIAL GROWTH IN BIOFILMS, PT B: SPECIAL ENVIRONMENTS AND PHYSICOCHEMICAL ASPECTS, 2001, 337 :285-305

[9] Tomographic imaging of trickle-bed reactors [J].

Reinecke, N ;

Mewes, D .

CHEMICAL ENGINEERING SCIENCE, 1996, 51 (10) :2131-&

[10] Structure-flow correlations in packed beds [J].

Sederman, AJ ;

Johns, ML ;

Alexander, P ;

Gladden, LF .

CHEMICAL ENGINEERING SCIENCE, 1998, 53 (12) :2117-2128

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