超大宽高比螺旋板式微通道对O/W乳状液的破乳研究

doi:10.11949/0438-1157.20200862

化工学报 ›› 2021, Vol. 72 ›› Issue (3): 1392-1399.DOI: 10.11949/0438-1157.20200862

超大宽高比螺旋板式微通道对O/W乳状液的破乳研究

马正东^1,²(),韦梅秀²,卢琪霖²,地力亚尔·哈米提null²,陈晓^1,²()

^1.西南民族大学化学与环境学院，化学基础国家民委重点实验室，四川成都 610041
^2.西南民族大学化学与环境学院，微流体合成与分离实验室，四川成都 610041

收稿日期:2020-07-01 修回日期:2020-09-03 出版日期:2021-03-05 发布日期:2021-03-05
通讯作者: 陈晓
作者简介:马正东（1995—），男，硕士研究生，mazd.c@outlook.com
基金资助:
国家自然科学基金项目(21406183);西南民族大学中央高校基本科研业务费化学基础国家民委重点实验室专项(2020PTJS20001)

Research on demulsification of O/W emulsion by spiral plate microchannel with ultra-large aspect ratio

MA Zhengdong^1,²(),WEI Meixiu²,LU Qilin²,DILIYAER?Hamiti ²,CHEN Xiao^1,²()

^1.Key Laboratory of Basic Chemistry, State Ethnic Affairs Commission, College of Chemistry & Environment, Southwest Minzu University, Chengdu 610041, Sichuan, China
^2.Microfluidic Synthesis and Separation Laboratory, College of Chemistry & Environment, Southwest Minzu University, Chengdu 610041, Sichuan, China

Received:2020-07-01 Revised:2020-09-03 Online:2021-03-05 Published:2021-03-05
Contact: CHEN Xiao

摘要/Abstract

摘要：

设计加工出一种高分离通量的三维螺旋板式微通道（three-dimensional spiral plate-type microchannel，3D-SPM），利用该微通道内的亲油疏水表面与三维螺旋微结构之间的耦合作用，强化了对水包油（O/W）型乳状液的破乳过程。结合计算机模拟方法，研究了微通道片数、乳状液体积流速、停留时间对破乳率的影响。实验结果表明：随着微通道片数的增加，破乳率增加，破乳后的液滴粒径逐渐减小；随着乳状液体积流速的增加，破乳率呈先上升后下降的趋势，体现出通道的表面作用和Dean涡流作用的耦合效果，最大单次破乳率为25%；随着停留时间的增加，破乳率增加，8次循环破乳后，最大破乳率为85.9%。通过计算机模拟发现：随着流速增加，微通道矩形截面中Dean涡流的个数及强度随之增加，涡流区域不断向上下壁面拓展，当体积流速为8 ml/min时Dean涡流的个数达到最大为2对，此时壁面剪切速率为5527 s^-1，达到最大破乳率，进一步提升流速，由于壁面处剪切速率和Dean涡流扰动过大，导致破乳率降低。

关键词: 微通道, 乳液, 破乳, 计算机模拟, Dean涡流

Abstract:

A three-dimensional spiral plate-type microchannel (3D-SPM) with high separation flux was designed and processed. The coupling effect between the unique oleophilic and hydrophobic surface in the microchannel and the 3D-SPM microstructure was utilized to strengthen the demulsification process of the O/W emulsion. Combined with computer simulation methods, the effects of the number of microchannels, emulsion volume flow rate, and residence time on the demulsification rate were studied. The results showed that the demulsification efficiency increased with the increased plate number of the microchannel, and the size of liquid droplets decreased gradually after the demulsification. With the increase of the volume flow rate of emulsion, the demulsification efficiency firstly increases to a maximum and then decreases, which reflects the coupling effect of the surface effect and the Dean vortex. The maximum single demulsification efficiency was 25%. With the increase of residence time, the demulsification efficiency increased. After 8 cycles of demulsification, the maximum demulsification efficiency reached 85.9%. The numerical simulation by computer simulation revealed that as the flow rate increases, both of the number and intensity of Dean vortex inside the rectangular cross-section increase, and the vortex region expands to the outer walls continuously. When the volume flow rate was 8 ml/min, the number of Dean vortex reached a maximum of 2 pairs, the maximum shear rate inside the microchannel was 5527 s^-1 and the demulsification efficiency reached the maximum. Further increase the flow rate, the demulsification rate decreases due to the excessive disturbance of the shear rate at the wall and the Dean vortex.

Key words: microchannels, emulsions, demulsification, computer simulation, Dean vortex

中图分类号:

马正东, 韦梅秀, 卢琪霖, 地力亚尔·哈米提null, 陈晓. 超大宽高比螺旋板式微通道对O/W乳状液的破乳研究[J]. 化工学报, 2021, 72(3): 1392-1399.

MA Zhengdong, WEI Meixiu, LU Qilin, DILIYAER?Hamiti , CHEN Xiao. Research on demulsification of O/W emulsion by spiral plate microchannel with ultra-large aspect ratio[J]. CIESC Journal, 2021, 72(3): 1392-1399.

图/表 6

图1 三维螺旋板式微通道

Fig.1 Three-dimensional spiral plate-type microchannel

图2 乳液稳定性（a）；PTFE壁面的接触角（b）

Fig.2 Stability of the emulsion(a); Contact angle on the surface of PTFE(b)

图3 片数对破乳率的影响（a）；循环次数对破乳率的影响（b）；循环破乳过程对液滴粒径的影响（c）

Fig.3 Effect of plate number on demulsification efficiency(a); Effect of cycle times on demulsification efficiency (b); Effect of cyclic demulsification on droplet size(c)

图4 微通道截面(a)；截面中液滴的受力分析(b)；微通道截面剪切速率(c)；截面中Dean涡流(d)

Fig.4 Arc section of microchannel(a); Force analysis of droplets in the cross section (b); Shear rate inside the cross section(c); Dean vortex inside the cross section(d)

图5 截面剪切速率变化(a)；截面高度方向速度及Dean涡流流线(b)（箭头的方向和大小分别代表Dean涡流的流向和强度，颜色图例表示z方向的速度大小）

Fig.5 Shear rate inside the cross section(a); Velocity in z direction and Dean vortex inside the cross section(b)（The size and direction of the arrows represent the intensity and the flow direction of Dean vortex, and the color legend represents the velocity in z direction）

图6 停留时间对破乳率的影响

Fig.6 Effect of residence time on demulsification efficiency

参考文献 31

1	Zhou L, He Y, Shi H, et al. One-pot route to synthesize HNTs@PVDF membrane for rapid and effective separation of emulsion-oil and dyes from waste water[J]. Journal of Hazardous Materials, 2019, 380: 120865.
2	Shi K, Bai Z, Su T, et al. Selective enzymatic degradation and porous morphology of poly(butylene succinate)/poly(lactic acid) blends[J]. International Journal of Biological Macromolecules, 2019, 126: 436-442.
3	Nowbahar A, Whitaker K A, Schmitt A K, et al. Mechanistic study of water droplet coalescence and flocculation in diluted bitumen emulsions with additives using microfluidics[J]. Energy & Fuels, 2017, 31(10): 10555-10565.
4	Ren B, Kang Y. Demulsification of oil-in-water (O/W) emulsion in bidirectional pulsed electric field[J]. Langmuir, 2018, 34(30): 8923-8931.
5	Srivastava A, Karthick S, Jayaprakash K S, et al. Droplet demulsification using ultralow voltage-based electrocoalescence[J]. Langmuir, 2018, 34(4): 1520-1527.
6	Atehortua C M G, Perez N, Andrade M A B, et al. Water-in-oil emulsions separation using an ultrasonic standing wave coalescence chamber[J]. Ultrasonics - Sonochemistry, 2019, 57: 57-61.
7	Guo H, Yang J, Xu T, et al. A robust cotton textile-based material for high-flux oil-water separation[J]. ACS Applied Materials & Interfaces, 2019, 11: 13704-13713.
8	张佳星, 马艳艳, 周敏, 等. 油水分离技术进展[J]. 净水技术, 2017, 36(12): 50-54, 61.
	Zhang J X, Ma Y Y, Zhou M, et al. Advances in oil-water separation technologies[J]. Water Purification Technology, 2017, 36(12): 50-54, 61.
9	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.
10	李严凯, 王凯, 骆广生. 液液微分散及其用于标准颗粒制备的研究进展[J]. 化工进展, 2019, 38(1): 30-44.
	Li Y K, Wang K, Luo G S. Advances in liquid-liquid micro-dispersion and its applications in standard particle preparation[J]. Chemical Industry and Engineering Progress, 2019, 38(1): 30-44.
11	Okubo Y, Toma M, Ueda H, et al. Microchannel devices for the coalescence of dispersed droplets produced for use in rapid extraction processes[J]. Chemical Engineering Journal, 2004, 101(1/2/3): 39-48.
12	Kolehmainen E, Turunen I. Micro-scale liquid-liquid separation in a plate-type coalescer[J]. Chemical Engineering and Processing: Process Intensification, 2007, 46(9): 834-839.
13	Chen X, Lu H, Jiang W, et al. De-emulsification of kerosene/water emulsions with plate-type microchannels[J]. Industrial & Engineering Chemistry Research, 2010, 49(19): 9279-9288.
14	Ruan D, Hamiti D, Ma Z D, et al. Demulsification of kerosene/water emulsion in the transparent asymmetric plate-type micro-channel[J]. Micromachines (Basel), 2018, 9(12): 680.
15	Oozeki N, Ookawara S, Ogawa K, et al. Characterization of microseparator/classifier with a simple arc microchannel[J]. AIChE Journal, 2009, 55(1): 24-34.
16	Nivedita N, Ligrani P, Papautsky I. Dean flow dynamics in low-aspect ratio spiral microchannels[J]. Scientific Reports, 2017, 7: 44072.
17	Zhou Y, Ma Z, Tayebi M, et al. Submicron particle focusing and exosome sorting by wavy microchannel structures within viscoelastic fluids[J]. Analytical Chemistry, 2019, 91: 4577-4584.
18	Shen S, Tian C, Li T, et al. Spiral microchannel with ordered micro-obstacles for continuous and highly-efficient particle separation[J]. Lab on a Chip, 2017, 17(21): 3578-3591.
19	Shen S, Zhang F, Wang S, et al. Ultra-low aspect ratio spiral microchannel with ordered micro-bars for flow-rate insensitive blood plasma extraction[J]. Sensors and Actuators B: Chemical, 2019, 287: 320-328.
20	Guzniczak E, Otto O, Whyte G, et al. Deformability-induced lift force in spiral microchannels for cell separation[J]. Lab on a Chip, 2020, 20: 614-625.
21	蒲亚东, 阮达, 地力亚尔·哈米提, 等. 加电三维螺旋板式微通道对W/O 型乳状液的破乳[J]. 化工学报, 2017, 68(7): 2790-2797.
	Pu Y D, Ruan D, Diliyaer H, et al. Demulsification of W/O emulsion with three-dimensional electric spiral plate-type microchannel[J]. CIESC Journal, 2017, 68(7): 2790-2797.
22	Ma Z, Pu Y, Hamiti D, et al. Elaboration of the demulsification process of W/O emulsion with three-dimensional electric spiral plate-type microchannel[J]. Micromachines (Basel), 2019, 10(11): 751.
23	但小凤, 曹耿, 姚志坤, 等. 激光粒度仪测定煤油/水乳液粒度分布的实验研究[J]. 四川化工, 2014, 17(2): 35-39.
	Dan X F, Cao G, Yao Z K, et al. Use laser particle analyzer to determinate the droplet size distribution of kerosene/water emulsion[J]. Sichuan Chemical Industry, 2014, 17(2): 35-39.
24	曹耿, 但小凤, 程昌敬, 等. 煤油/水体系乳状液的制备及其稳定性研究[J]. 西南民族大学学报(自然科学版), 2014, 40(2): 228-232.
	Cao G, Dan X F, Cheng C J, et al. The preparation and stability of kerosene/water emulsion[J]. Journal of Southwest University for Nationalities (Natural Science Edition), 2014, 40(2): 228-232.
25	Opalski A S, Makuch K, Lai Y K, et al. Grooved step emulsification systems optimize the throughput of passive generation of monodisperse emulsions[J]. Lab on a Chip, 2019, 19(7): 1183-1192.
26	de Vita F, Rosti M E, Caserta S, et al. Numerical simulations of vorticity banding of emulsions in shear flows[J]. Soft Matter, 2020, 16(11): 2854-2863.
27	Nguyen N, Thurgood P, Arash A, et al. Inertial microfluidics with integrated vortex generators using liquid metal droplets as fugitive ink[J]. Advanced Functional Materials, 2019, 29: 1901998.
28	Liao Y, Lucas D. A literature review on mechanisms and models for the coalescence process of fluid particles[J]. Chemical Engineering Science, 2010, 65(10): 2851-2864.
29	Shen F, Li Y, Wang G, et al. Mechanisms of rectangular groove-induced multiple-microdroplet coalescences[J]. Acta Mechanica Sinica, 2017, 33(3): 585-594.
30	Zhang J, Yuan D, Zhao Q, et al. Fundamentals of differential particle inertial focusing in symmetric sinusoidal microchannels[J]. Analytical Chemistry, 2019, 91: 4077-4084.
31	Williams Y O N, Rodriguez-Lopez G, Villa-Torrealba A, et al. Assessing the arrest of coalescence due to Marangoni effects in flowing emulsions using population balance[J]. Journal of Colloid and Interface Science, 2019, 554: 544-553.

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超大宽高比螺旋板式微通道对O/W乳状液的破乳研究

Research on demulsification of O/W emulsion by spiral plate microchannel with ultra-large aspect ratio

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