One-dimensional amplification and gas-liquid mass transfer characteristics of microchannel reactor

doi:10.11949/0438-1157.20201064

Abstract

Abstract:

The microchannel reactor can effectively enhance the mass transfer between gas and liquid, but its processing capacity is limited. To increase the productivity of the microchannel, one-dimensional amplification and the gas-liquid mass transfer characteristics of the microchannel reactor were investigated. By using CO₂ absorption into monoethanolamine (MEA) and methyldiethanolamine (MDEA) mixed aqueous solution as the working system, the effects of microchannel width and gas-liquid flow rate on mass transfer characteristics were studied under a constant channel depth. The results show that both the mass transfer coefficient and volumetric mass transfer coefficient increase firstly and then slightly decrease with increasing channel width, and the maximum values are attained in 400 μm × 1000 μm channel. The specific surface area decreases with the increase of channel width. Therefore, a reasonable increase in the width of the microchannel can improve the processing capacity while still maintaining good mass transfer characteristics.

Key words: microchannel reactor, carbon dioxide, gas-liquid mass transfer, single-dimension scale-up, mass transfer coefficient

摘要：

微通道反应器能有效增强气液间传质，但处理能力受限。为了提高微通道的处理量，对微通道反应器的一维放大及气-液传质特性进行了研究。以乙醇胺（MEA）和甲基二乙醇胺（MDEA）混合水溶液吸收CO₂为研究物系，在通道深度恒定时，考察了微通道宽度、气液流速对传质特性的影响。结果表明，传质系数和体积传质系数均随通道宽度先增大后缓慢减小，在通道宽度为1000 μm时达到最大值。比表面积随通道宽度的增大而降低。因此，合理增大微通道宽度，可在提高处理能力的同时，仍然保持良好的传质特性。

关键词: 微通道反应器, 二氧化碳, 气液传质, 一维放大, 传质系数

CLC Number:

TQ 021.4

WANG Guanqiu, LIN Guanyi, ZHU Chunying, FU Taotao, MA Youguang. One-dimensional amplification and gas-liquid mass transfer characteristics of microchannel reactor[J]. CIESC Journal, 2021, 72(2): 937-944.

王冠球, 林冠屹, 朱春英, 付涛涛, 马友光. 微通道反应器的一维放大及气液传质特性[J]. 化工学报, 2021, 72(2): 937-944.

Figures/Tables 6

Fig.1 Schematic diagram of the experimental setup

Fig.2 Gas-liquid flow conditions in five microchannels with various width

Fig.3 Comparison of CO2 absorption rate in microchannels with different width

Fig.4 Effect of channel width on specific surface area

Fig.5 Effects of gas flow rate and channel width on mass transfer coefficient (a) and volumetric mass transfer coefficient (b)(uL= 0.10416 m·s-1)

Fig.6 Effect of liquid flow rate on mass transfer coefficient (a) and volumetric mass transfer coefficient (b)

References 37

1	Sobieszuk P, Aubin J, Pohorecki R. Hydrodynamics and mass transfer in gas-liquid flows in microreactors[J]. Chemical Engineering & Technology, 2012, 35(8): 1346-1358.
2	王彦, 王靖涛. 微流控技术制备聚酰胺微胶囊的工艺研究[J]. 化学工业与工程, 2018, 35(6): 20-25.
	Wang Y, Wang J T. Preparation of polyamide microcapsules based on microfluidics[J]. Chemical Industry and Engineering, 2018, 35(6): 20-25.
3	Zhou Y F, Yao C Q, Zhang P, et al. Dynamic coupling of mass transfer and chemical reaction for Taylor flow along a serpentine microchannel[J]. Industrial & Engineering Chemistry Research, 2020, 59(19): 9279-9292.
4	Vivekanand S V B, Raju V R K. Effect of wall temperature modulation on the heat transfer characteristics of droplet-train flow inside a rectangular microchannel[J]. Chinese Journal of Chemical Engineering, 2020, 28(3): 685-697.
5	Ganapathy H, Shooshtari A, Dessiatoun S, et al. Fluid flow and mass transfer characteristics of enhanced CO₂ capture in a minichannel reactor[J]. Applied Energy, 2014, 119: 43-56.
6	Yue J, Luo L G, Gonthier Y, et al. An experimental study of air-water Taylor flow and mass transfer inside square microchannels[J]. Chemical Engineering Science, 2009, 64(16): 3697-3708.
7	Zhou F, Zhou W, Zhang C Y, et al. Experimental and numerical studies on heat transfer enhancement of microchannel heat exchanger embedded with different shape micropillars[J]. Applied Thermal Engineering, 2020, 175: 115296.
8	荀涛, 蔡旺锋, 张旭斌. 微通道中气-液-液三相流流型及传质研究[J]. 化学工业与工程, 2017, 34(6): 81-87.
	Xun T, Cai W F, Zhang X B. The flow pattern and mass transfer of gas-liquid-liquid three-phase flow in microchannel[J]. Chemical Industry and Engineering, 2017, 34(6): 81-87.
9	Chen G W, Yue J, Yuan Q. Gas-liquid microreaction technology: recent developments and future challenges[J]. Chinese Journal of Chemical Engineering, 2008, 16(5): 663-669.
10	Ganapathy H, Steinmayer S, Shooshtari A, et al. Process intensification characteristics of a microreactor absorber for enhanced CO₂ capture[J]. Applied Energy, 2016, 162: 416-427.
11	Yue J, Chen G W, Yuan Q, et al. Hydrodynamics and mass transfer characteristics in gas-liquid flow through a rectangular microchannel[J]. Chemical Engineering Science, 2007, 62(7): 2096-2108.
12	Chambers R D, Holling D, Spink R C, et al. Elemental fluorine(13): Gas-liquid thin film microreactors for selective direct fluorination[J]. Lab on a Chip, 2001, 1(2): 132-137.
13	de Mas N, Günther A, Schmidt M A, et al. Microfabricated multiphase reactors for the selective direct fluorination of aromatics[J]. Industrial & Engineering Chemistry Research, 2003, 42(4): 698-710.
14	Leclerc A, Alamé M, Schweich D, et al. Gas-liquid selective oxidations with oxygen under explosive conditions in a micro-structured reactor[J]. Lab on a Chip, 2008, 8(5): 814-817.
15	Hessel V, Kralisch D, Kockmann N, et al. Novel process windows for enabling, accelerating, and uplifting flow chemistry[J]. ChemSusChem, 2013, 6(5): 746-789.
16	Ye C B, Dang M H, Yao C Q, et al. Process analysis on CO₂ absorption by monoethanolamine solutions in microchannel reactors[J]. Chemical Engineering Journal, 2013, 225: 120-127.
17	Chu C Y, Zhang F B, Zhu C Y, et al. Mass transfer characteristics of CO₂ absorption into 1-butyl-3-methylimidazolium tetrafluoroborate aqueous solution in microchannel[J]. International Journal of Heat and Mass Transfer, 2019, 128: 1064-1071.
18	Sotowa K I, Sugiyama S, Nakagawa K. Flow uniformity in deep microchannel reactor under high throughput conditions[J]. Organic Process Research & Development, 2009, 13(5): 1026-1031.
19	陈光文, 赵玉潮, 乐军, 等. 微化工过程中的传递现象[J]. 化工学报, 2013, 64(1): 63-75.
	Chen G W, Zhao Y C, Yue J, et al. Transport phenomena in micro-chemical engineering[J]. CIESC Journal, 2013, 64(1): 63-75.
20	Zhang J S, Wang K, Teixeira A R, et al. Design and scaling up of microchemical systems: a review[J]. Annual Review of Chemical and Biomolecular Engineering, 2017, 8(1): 285-305.
21	Al-Rawashdeh M, Yu F, Nijhuis T A, et al. Numbered-up gas-liquid micro/milli channels reactor with modular flow distributor[J]. Chemical Engineering Journal, 2012, 207/208: 645-655.
22	Yue J, Boichot R, Luo L G, et al. Flow distribution and mass transfer in a parallel microchannel contactor integrated with constructal distributors[J]. AIChE Journal, 2010, 56(2): 298-317.
23	Liu G T, Wang K, Lu Y C, et al. Liquid-liquid microflows and mass transfer performance in slit-like microchannels[J]. Chemical Engineering Journal, 2014, 258: 34-42.
24	Ganapathy H, Shooshtari A, Dessiatoun S, et al. Hydrodynamics and mass transfer performance of a microreactor for enhanced gas separation processes[J]. Chemical Engineering Journal, 2015, 266: 258-270.
25	Niu H N, Pan L W, Su H J, et al. Effects of design and operating parameters on CO₂ absorption in microchannel contactors[J]. Industrial & Engineering Chemistry Research, 2009, 48(18): 8629-8634.
26	Nieves-Remacha M J, Kulkarni A A, Jensen K F. Gas-liquid flow and mass transfer in an advanced-flow reactor[J]. Industrial & Engineering Chemistry Research, 2013, 52(26): 8996-9010.
27	Akachuku A, Osei P A, Decardi-Nelson B, et al. Experimental and kinetic study of the catalytic desorption of CO₂ from CO₂-loaded monoethanolamine (MEA) and blended monoethanolamine-methyl-diethanolamine (MEA-MDEA) solutions[J]. Energy, 2019, 179: 475-489.
28	林冠屹, 朱春英, 付涛涛, 等. 微通道内MEA/MDEA混合溶液吸收CO₂的传质特性[J]. 化工学报, 2018, 69(11): 4675-4682.
	Lin G Y, Zhu C Y, Fu T T, et al. Mass transfer performance of CO₂ absorption into aqueous mixture of monoethanolamine with N-methyldiethanolamine in microchannel[J]. CIESC Journal, 2018, 69(11): 4675-4682.
29	Yao C Q, Dong Z Y, Zhao Y C, et al. An online method to measure mass transfer of slug flow in a microchannel[J]. Chemical Engineering Science, 2014, 112: 15-24.
30	Zhu C Y, Li C F, Gao X Q, et al. Taylor flow and mass transfer of CO₂ chemical absorption into MEA aqueous solutions in a T-junction microchannel[J]. International Journal of Heat and Mass Transfer, 2014, 73: 492-499.
31	Musterd M, van Steijn V, Kleijn C R, et al. Calculating the volume of elongated bubbles and droplets in microchannels from a top view image[J]. RSC Advances, 2015, 5(21): 16042-16049.
32	Lin G Y, Jiang S, Zhu C Y, et al. Mass-transfer characteristics of CO₂ absorption into aqueous solutions of N-methyldiethanolamine + diethanolamine in a T-junction microchannel[J]. ACS Sustainable Chemistry & Engineering, 2019, 7(4): 4368-4375.
33	Zhu C Y, Lu Y T, Fu T T, et al. Experimental investigation on gas-liquid mass transfer with fast chemical reaction in microchannel[J]. International Journal of Heat and Mass Transfer, 2017, 114: 83-89.
34	Penttilä A, Dell'era C, Uusi-Kyyny P, et al. The Henry's law constant of N₂O and CO₂ in aqueous binary and ternary amine solutions (MEA, DEA, DIPA, MDEA, and AMP)[J]. Fluid Phase Equilibria, 2011, 311: 59-66.
35	Aussillous P, Quéré D. Quick deposition of a fluid on the wall of a tube[J]. Physics of Fluids, 2000, 12(10): 2367.
36	Pohorecki R. Effectiveness of interfacial area for mass transfer in two-phase flow in microreactors[J]. Chemical Engineering Science, 2007, 62(22): 6495-6498.
37	Yao C Q, Dong Z Y, Zhao Y C, et al. Gas-liquid flow and mass transfer in a microchannel under elevated pressures[J]. Chemical Engineering Science, 2015, 123: 137-145.

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