丙烯酸酯-甲基丙烯酸共聚物乳液反相破乳剂的合成及应用
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中海油天津油田化工有限公司

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中海油能源发展股份有限公司工程技术分公司科研项目(GCJSXMHT-1908)。


Preparation and analysis of acrylate- methacrylic acid copolymer emulsion reversed demulsifier
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    摘要:

    海上油田污水处理设备少,停留时间短,对污水处理药剂要求极高。为了提高油水分离效果,提升污水处理水质,有必要开发一种高效反相破乳剂。以丙烯酸乙酯(EA)、甲基丙烯酸(MAA)和丙烯酸十八酯(SA)为原料,利用乳液聚合法,合成了一种新型丙烯酸酯-甲基丙烯酸共聚物乳液型反相破乳剂(EMASA)。通过FT-IR光谱、1HNMR分析和DSC分析证实了目标产物的结构。以除油率为主要指标,对其净水性能进行研究,处理海上油田A平台采出液(水型为碳酸氢钠型)的瓶试结果为:EMASA在最优加注浓度30mg/L时,除油率为96.5%;协同现场絮凝剂ECHA的除油率为98.9%。在A平台开展中试试验:EMASA加注30mg/L,分离器出口水中含油值由255.75mg/L降低至197.58mg/L,降低22.74%,除油率由95.5%提高至96.52%。发现该药剂在处理碳酸氢钠水型采出液时效果明显,通过动态光散射、界面张力和界面扩张模量对其作用机理进行解释,证明反相破乳剂EMASA具有推广价值。

    Abstract:

    Requirements for sewage treatment chemicals are very high due to the limited sewage treatment equipment and short residence time in offshore oilfield. Thus, it is necessary to develop a high-efficient reversed demulsifier to improve the separation efficient of oil and water. In this work, acrylate-methacrylic acid copolymer emulsion reversed demulsifier (EMASA) was synthesized via emulsion polymerization method by using EA, MAA and SA as precursors. The structure and thermal properties of synthsized copolymer were characterized using FT-IR?, 1HNMR and DSC. The oil removal rates of synthesized copolymers were further investigated based on the water from the offshore oilfield A platform(water type is sodium bicarbonate). Results suggests that the oil removal rate of EMASA was 96.5% under a filling concentration of 30 mg/L, and the value further increased to 98.9% at the assistance of the flocculant,ECHA. Pilot scale test of the property of EMASA was further carried out on platform A. It was found that the OIW at the outlet of the oil system decreased from 255.75mg/L to 197.58mg/L under a EMASA filling concentration of 30mg/L, and the oil removal rate of the oil system increased from 94.89% to 96.05%. The mechanism of the role of EMASA was also clarified based on the results of dynamic light scattering, interfacial tension and expansion modulus.

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  • 收稿日期: 2021-07-07
  • 最后修改日期: 2021-10-08
  • 录用日期: 2021-10-09
  • 在线发布日期: 2022-02-22
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