Coalescence technology and its application in the separation of oil and water emulsion

doi:10.16085/j.issn.1000-6613.2019-1108

Abstract

Abstract: Coalescence separation is a kind of physical method based on the different wettability of oil and water on the solid surface, in which the tiny droplets in emulsion gradually adhere, grow up and separate on the surface of coalescing materials. Oil and water can be separated because of the different density. Due to its advantages of good structure controllability, high separation efficiency and low operation cost, it becomes a hot topic in the field of emulsified oil-water separation. In this paper, the coalescence separation method is described and its principle and the influencing factors are introduced in details firstly. At the same time, the researches on coalescence materials and the surface modification are summarized. The surface of the coalesced material have special wettability through various modification methods, which can significantly improve the oil-water separation efficiency. The classification and application of coalescer separator are systematically introduced. For different industrial applications, the corresponding coalescer can be selected. Finally, the application of coalescence separation technology in petrochemical industry is elaborated. The prospect pointed out that the actual droplet coalescence process and the factors affecting the separation effect can be further studied. The optimization design of the separator, coalescence behavior of emulsified oil/water, mechanism, and control mechanisms will be the focus of the study of coalescence separation.

Key words: coalescence separation, emulsions, emulsified oil/water separation, wastewater, coalescer

摘要： 聚结分离是一种利用油、水两相对材料浸润性的不同而实现乳化液滴聚结长大并最终通过重力沉降实现油水分离的物理方法，这种方法结构可控性好、分离效率高、运行成本低，是乳化油水分离领域的研究热点。本文首先对聚结分离方法进行详细阐述，介绍了聚结分离原理和影响因素；总结了近年来国内外学者对聚结材料表面改性和修饰等方面的研究。通过调控聚结材料的表面具有特殊浸润性，可显著提高油水分离效率；系统介绍聚结分离器的分类及其应用。最后阐述了聚结分离技术在石油化工领域的应用。本文对聚结分离技术进行展望，指出可以进一步研究实际液滴聚结过程和分离效果影响因素，应深入研究分离器在乳化油水分离过程中液滴聚结行为、机理、控制机制将是研究的重点。

关键词: 聚结分离, 乳液, 乳化油水分离, 废水, 聚结分离器

CLC Number:

TQ028.4

YANG Yujie, CHEN Wenwen, ZHANG Qian, LI Lei, LIN Song, WANG Zaiqian, LI Wangliang. Coalescence technology and its application in the separation of oil and water emulsion[J]. Chemical Industry and Engineering Progress, 2019, 38(s1): 10-18.

杨玉洁, 陈雯雯, 张倩, 李蕾, 林松, 王在谦, 李望良. 聚结技术及其乳化油水分离性能[J]. 化工进展, 2019, 38(s1): 10-18.

References

[1] 桑义敏, 云昊, 韩严和, 等. 污水中油滴聚结机理与材料聚结技术研究进展[J]. 工业水处理, 2016, 36(10):6-10. SANG Yimin, YUN Hao, HAN Yanhe, et al. Progress in the research on coalescence mechanism of oil drops in wastewater and material coalescence technology[J]. Industrial Water Treatment, 2016, 36(10):6-10.
[2] HU D, ZHANG Q, YANG C, et al. Process diagnosis of coalescence separation of oil-in-water emulsions-two case studies[J]. Journal of Dispersion Science and Technology, 2019, 40(5):745-755.
[3] 段传虎. 刍议油水分离中聚结分离技术的应用[J]. 科技风, 2018(10):124. DUAN Chuanhu. Discussion on the application of coalescence separation technology in oil-water separation[J]. Science and Technology, 2018(10):124.
[4] 蒋昊琳, 杨明全, 张振超, 等. 含油污水聚结除油研究进展[J]. 能源化工, 2016, 37(2):27-31. JIANG Haolin, YANG Mingquan, ZHANG Zhenchao, et al. Research progress for coalescent removing oil from oily sewage[J]. Energy Chemical Industry, 2016, 37(2):27-31.
[5] 余晓月. 非尺寸因素对聚结板内油水分离性能的影响研究[D]. 西安:西安石油大学, 2016. YU X Y. Study on the effect of non-dimensional factor on the oil-water separation performance of the corrugated plate[D]. Xi'an:Xi'an Shiyou University, 2016.
[6] 刘丽艳, 侯立飞, 谭蔚, 等. 油水乳状液中水滴在疏水纤维丝上的聚结实验研究[J]. 天津大学学报(自然科学与工程技术版), 2018, 51(3):271-277. LIU Liyan, HOU Lifei, TAN Wei, et al. Coalescence of water droplets on hydrophobic fibers in water-in-oil emulsion[J]. Journal of Tianjin University(Science and Technology), 2018, 51(3):271-277.
[7] GADHAVE A D, MEHDIZADEH S N, CHASE G G. Effect of pore size and wettability of multilayered coalescing filters on water-in-ULSD coalescence[J]. Separation and Purification Technology, 2019, 221:236-248.
[8] LUO X, HUANG X, YAN H, et al. An experimental study on the coalescence behavior of oil droplet in ASP solution[J]. Separation and Purification Technology, 2018, 203:152-158.
[9] 王志华, 柏晔, 娄玉华, 等. 二元复合驱采出液乳化行为及破乳影响因素[J]. 石油化工高等学校学报, 2018, 31(6):33-40. WANG Zhihua, BAI Ye, LOU Yuhua, et al. Emulsification and demulsification of produced liquid in surfactant/polymer combination flooding[J]. Journal of Petrochemical Universities, 2018, 31(6):33-40.
[10] KHAN J A, AL-KAYIEM H H, ALEEM W, et al. Influence of alkali-surfactant-polymer flooding on the coalescence and sedimentation of oil/water emulsion in gravity separation[J]. Journal of Petroleum Science and Engineering, 2019, 173:640-649.
[11] WANG Z, CHEN R, ZHU X, et al. Dynamic behaviors of the coalescence between two droplets with different temperatures simulated by the VOF method[J]. Applied Thermal Engineering, 2018, 131:132-140.
[12] LI Y, Qin G, XIONG Z, et al. The effect of particle humidity on separation efficiency for an axial cyclone separator[J]. Advanced Powder Technology, 2019, 30(4):724-731.
[13] KAMP J, KRAUME M. From single drop coalescence to droplet swarms-scale-up considering the influence of collision velocity and drop size on coalescence probability[J]. Chemical Engineering Science, 2016, 156:162-177.
[14] BAHRAMI B, MOHSENPOUR S, SHAMSHIRI Noghabi H R, et al. Estimation of flow rates of individual phases in an oil-gas-water multiphase flow system using neural network approach and pressure signal analysis[J]. Flow Measurement and Instrumentation, 2019, 66:28-36.
[15] LIU L, HOU L, TAN W, et al. A visible coalescence of droplets on hydrophobic and hydrophilic fibers in water-in-oil emulsion[J]. Journal of Dispersion Science and Technology, 2017, 38(12):1719-1725.
[16] LI Y, GONG H, DONG M, et al. Separation of water-in-heavy oil emulsions using porous particles in a coalescence column[J]. Separation and Purification Technology, 2016, 166:148-156.
[17] ZHANG Q, LI L, LI Y X, et al. Surface wetting-driven separation of surfactant-stabilized water-oil emulsions[J]. Langmuir, 2018, 34(19):5505-5516.
[18] KUNDU P, KUMAR V, MISHR I M. Experimental study on flow and rheological behavior of oil-in-water emulsions in unconsolidated porous media:effect of particle size and phase volume fractions[J]. Powder Technology, 2019, 343:821-833.
[19] 杨琳. 基于聚结构件的油水分离器工艺参数优化研究[D]. 西安:西安石油大学, 2018. YANG Lin. Study on optimization of process parameters of oil-water separator based on coalescence separation[D]. Xi'an:Xi'an Shiyou University, 2018.
[20] MINO Y, HASEGAWA A, SHINTO H, et al. Lattice-Boltzmann flow simulation of an oil-in-water emulsion through a coalescing filter:effects of filter structure[J]. Chemical Engineering Science, 2018, 177:210-217.
[21] YU Y, LIU M, HUANG H, et al. Low cost fabrication of polypropylene fiber composite membrane with excellent mechanical, superhydrophilic, antifouling and antibacterical properties for effective oil-in-water emulsion separation[J]. Reactive and Functional Polymers, 2019, 142:15-24.
[22] SONG Y Z, KONG X, YIN X, et al. Tannin-inspired superhydrophilic and underwater superoleophobic polypropylene membrane for effective oil/water emulsions separation[J]. Colloids and Surfaces a-Physicochemical and Engineering Aspects, 2017, 522:585-592.
[23] SUN Y, YANG Z, LI L, et al. Facile preparation of isotactic polypropylene microporous membranes with bioinspired hierarchical morphology for nano-scale water-in-oil emulsion separation[J]. Journal of Membrane Science, 2019, 581:224-235.
[24] DING L P, GAO J, CHUNG T S. Schiff base reaction assisted one-step self-assembly method for efficient gravity-driven oil-water emulsion separation[J]. Separation and Purification Technology, 2019, 213:437-446.
[25] 徐卜琴, 赵宗倩, 徐桂龙, 等. 超疏水超亲油玻璃纤维过滤膜的制备及其乳化水分离效率[J]. 硅酸盐学报, 2018, 46(8):1173-1177. XU Puqin, ZHAO Zongqian, XU Guilong, et al. Preparation of superhydrophobic and superoleophilic glass-fiber membrane and its emulsified water separation efficiency[J]. Journal of the Chinese Ceramic Society, 2018, 46(8):1173-1177.
[26] PHIRI I, EUM K Y, KIM J W, et al. Simultaneous complementary oil-water separation and water desalination using functionalized woven glass fiber membranes[J]. Journal of Industrial and Engineering Chemistry, 2019, 73:78-86.
[27] ROSTAMI A, SHARIFNIA S. Fabrication of robust and durable superhydrophobic fiberglass fabrics for oil-water separation based on self-assembly of novel N-TESPO and N-TESPS reagents[J]. Journal of Materials Chemistry A, 2017, 5(2):680-688.
[28] LIX Y, HU D, HUANG K, et al. Hierarchical rough surfaces formed by LBL self-assembly for oil-water separation[J]. Journal of Materials Chemistry A, 2014, 2(30):11830-11838.
[29] CHEN J, ZHOU Y, ZHOU C, et al. A durable underwater superoleophobic and underoil superhydrophobic fabric for versatile oil/water separation[J]. Chemical Engineering Journal, 2019, 370:1218-1227.
[30] LIU M M, LI J, HOU Y Y, et al. Inorganic adhesives for robust superwetting surfaces[J]. ACS Nano, 2017, 11(1):1113-1119.
[31] JIANG L, TANG Z G, Park-Lee K J, et al. Fabrication of non-fluorinated hydrophilic-oleophobic stainless steel mesh for oil-water separation[J]. Separation and Purification Technology, 2017, 184:394-403.
[32] 杨啸天, 帅茜, 罗艳梅, 等. 聚二甲基硅氧烷/微纳米银/聚多巴胺修饰的超疏水海绵的制备和应用[J]. 应用化学, 2015, 32(6):726-732. YANG Xiaotian, SHUAI Qian, LUO Yanmei, et al. Fabrication and application of the superhydrophobic sponge modified with poly (dimethylsiloxane)/silver micro/nano-particles/polydopamine[J]. Chinese Journal of Applied Chemistry, 2015, 32(6):726-732.
[33] WAN Z, LI D, JIAO Y, et al. Bifunctional MoS₂ coated melamine-formaldehyde sponges for efficient oil-water separation and water-soluble dye removal[J]. Applied Materials Today, 2017, 9:551-559.
[34] LI Y, ZHANG Z Z, WANG M K, et al. One-pot fabrication of nanoporous polymer decorated materials:from oil-collecting devices to high-efficiency emulsion separation[J]. Journal of Materials Chemistry A, 2017, 5(10):5077-5087.
[35] YANG J B, WANG H C, TAO Z A, et al. 3D superhydrophobic sponge with a novel compression strategy for effective water-in-oil emulsion separation and its separation mechanism[J]. Chemical Engineering Journal, 2019, 359:149-158.
[36] WANG N, DENG Z. Synthesis of magnetic, durable and superhydrophobic carbon sponges for oil/water separation[J]. Materials Research Bulletin, 2019, 115:19-26.
[37] XU L, CHEN Y, LIU N, et al. Breathing demulsification:a three-dimensional(3D) free-standing superhydrophilic sponge[J]. ACS Applied Materials & Interfaces, 2015, 7(40):22264-22271.
[38] WU Z Z, LI Y Z, ZHANG L P, et al. Thiol-ene click reaction on cellulose sponge and its application for oil/water separation[J]. RSC Advances, 2017, 7(33):20147-20151.
[39] HU D, LI X Y, I L, et al. Designing high-caliber nonwoven filter mats for coalescence filtration of oil/water emulsions[J]. Separation and Purification Technology, 2015, 149:65-73.
[40] LI Y X, CAO L X, HU D, et al. Uncommon wetting on a special coating and its relevance to coalescence separation of emulsified water from diesel fuel[J]. Separation and Purification Technology, 2017, 176:313-322.
[41] LIU F, MA M, ZANG D, et al. Fabrication of superhydrophobic/superoleophilic cotton for application in the field of water/oil separation[J]. Carbohydrate Polymers, 2014, 103:480-487.
[42] DEL BLANCO M V, FISCHER E J, CABANE E. Underwater superoleophobic wood cross sections for efficient oil/water separation[J]. Advanced Materials Interfaces, 2017, 4(21):1700584.
[43] ZHANG W F, LIU N, CAO Y Z, et al. Superwetting porous materials for wastewater treatment:from immiscible oil/water mixture to emulsion separation[J]. Advanced Materials Interfaces, 2017, 4(10):1700029.
[44] 袁静, 廖芳芳, 郭雅妮, 等. 超亲水超疏油油水分离膜的制备及其性能[J]. 化学进展, 2019, 31(1):144-155. YUAN Jing, LIAO Fangfang, GUO Yani, et al. Preparation and performance of superhydrophilic and superoleophobic membrane for oil/water separation[J]. Progress In Chemistry, 2019, 31(1):144-155.
[45] 屈孟男, 马利利, 何金梅, 等. 特异润湿型油水分离材料的研究进展[J]. 材料导报, 2017, 31(19):152-161. QU Mengnan, MA Lili, HE Jinmei, et al. Research progress of specific wetting oil-water separation materials[J]. Materials Reports, 2017, 31(19):152-161.
[46] LI J J, ZHOU Y N, LUO Z H. Polymeric materials with switchable superwettability for controllable oil/water separation:a comprehensive review[J]. Progress in Polymer Science, 2018, 87:1-33.
[47] KONG T, LUO G, ZHAO Y, et al. Bioinspired superwettability micro/nanoarchitectures:fabrications and applications[J]. Advanced Functional Materials, 2019, 29(11):1808012.
[48] 佟威, 熊党生. 仿生超疏水表面的发展及其应用研究进展[J]. 无机材料学报, doi:10.15541/jim20180591. TONG Wei, XIONG Dangsheng. Bioinspired superhydrophobic progress and recent advances of its functional application[J]. Journal of Inorganic Materials, doi:10.15541/jim20180591.
[49] CAO J L, SU Y L, LI Y N, et al. Self-assembled MOF membranes with underwater superoleophobicity for oil/water separation[J]. Journal of Membrane Science, 2018, 566:268-277.
[50] LI X Y, HU D, CAO L X, et al. Sensitivity of coalescence separation of oil-water emulsions using stainless steel felt enabled by LBL self-assembly and CVD[J]. RSC Advances, 2015, 5(87):71345-71354.
[51] JOO M, SHIN J, KIM J, et al. One-step synthesis of cross-linked ionic polymer thin films in vapor phase and its application to an oil/water separation membrane[J]. Journal of the American Chemical Society, 2017, 139(6):2329-2337.
[52] WEN N, MIAO X R, YANG X J, et al. An alternative fabrication of underoil superhydrophobic or underwater superoleophobic stainless steel meshes for oil-water separation:originating from one-step vapor deposition of polydimethylsiloxane[J]. Separation and Purification Technology, 2018, 204:116-126.
[53] ZAREEI POUR F, KARIMI H, MADAD AVARGANI V. Preparation of a superhydrophobic and superoleophilic polyester textile by chemical vapor deposition of dichlorodimethylsilane for water-oil separation[J]. Polyhedron, 2019, 159:54-63.
[54] FENG X, LI J, ZHANG X, et al. Electrospun polymer micro/nanofibers as pharmaceutical repositories for healthcare[J]. Journal of Controlled Release, 2019, 302:19-41.
[55] LIAO Y, LOH C H, TIAN M, et al. Progress in electrospun polymeric nanofibrous membranes for water treatment:fabrication, modification and applications[J]. Progress in Polymer Science, 2018, 77:69-94.
[56] XUE J, WU T, DAI Y, et al. Electrospinning and electrospun nanofibers:methods, materials, and applications[J]. Chemical Reviews, 2019, 119(8):5298-5415.
[57] Hou L L, Wang N, Wu J, et al. Bioinspired superwettability electrospun micro/nanofibers and their applications[J]. Advanced Functional Materials, 2018, 28(49):1801114.
[58] GE J L, ZONG D D, JIN Q, et al. Biomimetic and superwettable nanofibrous skins for highly efficient separation of oil-in-water emulsions[J]. Advanced Functional Materials, 2018, 28(10):1705051.
[59] WU J D, DING Y J, WANG J Q, et al. Facile fabrication of nanofiber-and micro/nanosphere-coordinated PVDF membrane with ultrahigh permeability of viscous water-in-oil emulsions[J]. Journal of Materials Chemistry A, 2018, 6(16):7014-7020.
[60] HUANG Y, XIAO C F, HUANG Q L, et al. Robust preparation of tubular PTFE/FEP ultrafine fibers-covered porous membrane by electrospinning for continuous highly effective oil/water separation[J]. Journal of Membrane Science, 2018, 568:87-96.
[61] 黄卫星, 何雄元, 邓朝俊, 等. 聚结板强化油水分离过程的机理研究[J]. 工程科学与技术, 2017, 49(3):191-196. HUANG Weixing, HE Xiongyuan, DENG Chaojun, et al. Study on the intensification mechanism of oil-water separation process by using inclined plate pack[J]. Anvanced Engineering Sciences, 2017, 49(3):191-196.
[62] HAN Y, HE L, LUO X, et al. A review of the recent advances in design of corrugated plate packs applied for oil-water separation[J]. Journal of Industrial and Engineering Chemistry, 2017, 53:37-50.
[63] 齐玉成, 赵会军, 邵悦, 等. 波纹板聚结分离器分离效率影响因素研究[J]. 常州大学学报(自然科学版), 2016, 28(2):67-72. QI Yucheng, ZHAO Huijun, SHAO Yue, et al. On the influencing factors of separation efficiency of corrugated plate coalescing separator[J]. Journal of Changzhou University (Natural Science Edition), 2016, 28(2):67-72.
[64] LUO H, YANG X, LU Z, et al. Effect of drainage layer on oil distribution and separation performance of fiber-bed coalescer[J]. Separation and Purification Technology, 2019, 218:173-180.
[65] 郭骥, 姬忠礼. 苯酚浓度对亲油疏水型滤材聚结性能的影响[EB/OL]. 北京:过程工程学报, 2019[2019-07-23]. http://kns.cnki.net/kcms/detail/11.4541.TQ.20190424.1340.002.html. GUO Ji, JI Zhongli. Influence of phenol concentration on coalescence performance of an oleophilichydrophobic filter material[J]. The Chinese Journal of Process Engineering, 2019[2019-07-23]. http://kns.cnki.net/kcms/detail/11.4541.TQ.20190424.1340.002.html.