A comparative simulation study on oxidative coupling of methane in fixed-bed and membrane reactors

被引：45

作者：

Kao, YK

Lei, L

Lin, YS

机构：

[1] Department of Chemical Engineering, University of Cincinnati, Cincinnati

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 1997年 / 36卷 / 09期

关键词：

D O I：

10.1021/ie9606698

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Oxidative coupling of methane (OCM) on a conventional fixed-bed reactor (FBR) and a ceramic dense membrane reactor (DMR) packed with Li/MgO catalyst is analyzed using plug-flow reactor models. The validity of OCM kinetic equations employed in the modeling is confirmed by excellent agreement between the simulation and experimental data for OCM on FBR. For FBR, a high methane to oxygen feed ratio favors the OCM reaction, with a low C-2 yield because of insufficient oxygen supply. The highest C-2 yield achieved with a feed mixture consisting of 70% methane and 30% oxygen is 20.7% at a selectivity of 53% and operating temperature of 750 degrees C. The C-2 yield and selectivity increase slightly at a higher operating temperature. The optimal feed ratio does not change with temperature. DMR is made of a mixed-conducting ceramic membrane tube packed with an OCM catalyst. The membrane tube separates the methane and oxygen feed. The oxygen concentration in the DMR is much lower and more uniform than that in the FBR because of the different reactant feeding mode and logarithemic dependence of oxygen flux on oxygen partial pressures of the dense ceramic membrane. This results in a significantly increased C-2 selectivity and yield for the DMR as compared to the FBR.

引用

页码：3583 / 3593

页数：11

共 27 条

[11] LANE GS, 1988, J CATAL, V113, P114
[12] OXYGEN PERMEATION THROUGH THIN MIXED-CONDUCTING SOLID OXIDE MEMBRANES
LIN, YS
WANG, WJ
HAN, JH
[J]. AICHE JOURNAL, 1994, 40 (05) : 786 - 798
[13] LUO L, 1996, THESIS U CINCINNATI
[14] Matherne J. L., 1992, METHANE CONVERSION O
[15] OXIDATIVE COUPLING OF METHANE OVER LITHIUM-DOPED ULTRAFINE CRYSTALLINE MAGNESIUM-OXIDE
MATSUURA, I
UTSUMI, Y
DOI, T
YOSHIDA, Y
[J]. APPLIED CATALYSIS, 1989, 47 (02): : 299 - 306
[16] SELECTIVE OXIDATIVE COUPLING OF METHANE WITH MEMBRANE REACTOR
NOZAKI, T
YAMAZAKI, O
OMATA, K
FUJIMOTO, K
[J]. CHEMICAL ENGINEERING SCIENCE, 1992, 47 (9-11) : 2945 - 2950
[17] PEKEDIZ A, 1994, CHEM ENG SCI, V49, P4759
[18] KINETIC-TRANSPORT MODELS OF BIMODAL REACTION SEQUENCES .1. HOMOGENEOUS AND HETEROGENEOUS PATHWAYS IN OXIDATIVE COUPLING OF METHANE
REYES, SC
IGLESIA, E
KELKAR, CP
[J]. CHEMICAL ENGINEERING SCIENCE, 1993, 48 (14) : 2643 - 2661
[19] KINETIC TRANSPORT MODELS AND THE DESIGN OF CATALYSTS AND REACTORS FOR THE OXIDATIVE COUPLING OF METHANE
REYES, SC
KELKAR, CP
IGLESIA, E
[J]. CATALYSIS LETTERS, 1993, 19 (2-3) : 167 - 180
[20] METHANE OXIDATIVE COUPLING IN FIXED-BED CATALYTIC REACTORS WITH A DISTRIBUTED OXYGEN FEED - A SIMULATION STUDY
SANTAMARIA, J
MENENDEZ, M
PENA, JA
BARAHONA, JI
[J]. CATALYSIS TODAY, 1992, 13 (2-3) : 353 - 360

← 1 2 3 →