共查询到20条相似文献,搜索用时 15 毫秒
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综述了乳化原油中使用的破乳剂,重点介绍了它们的发展过程、种类、合成方法以及研究思路,探讨了破乳剂研制、生产和应用中存在的问题以及改进措施。 相似文献
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通过大量的矿场实验及室内实验发现,三元复合驱的乳化作用对油田原油采收率的提高具有重大的贡献,但采出原油也需要面临越来越严重的破乳问题。采用超声波辐照的方法,对超声波原油破乳方法进行了室内实验研究。结果表明,超声波辐照法的最终脱水效果,要好于化学剂破乳法及自然沉降法。在此基础上,研究了超声与破乳剂协同破乳的方法,并取得了较好的效果。 相似文献
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《分离科学与技术》2012,47(6):1367-1377
Abstract The demulsifying and separating experiments of crude oil emulsion were performed by using the heating method, the thermal chemical method, the microwave radiating method, and the microwave chemical method separately. The water content of this emulsion was 78 v/v%, and the type was water‐in‐oil (w/o). The influence tendencies of the key factors on demulsification effect were explored by changing the heating temperature, the demulsifier amount used and the microwave radiating time in this paper. With the microwave chemical experiments on the self‐made emulsions of different water content, the demulsification rate and separation efficiency were explored. The type of these emulsions were oil‐in‐water (o/w), water‐in‐oil (w/o) and the multiple type, related to the water content scopes which were less than 30 v/v%, more than 70 v/v% and between them, respectively. The separation effect by the microwave chemical method for the high water content crude oil emulsion was better than that of emulsion with lower water content. For the crude oil used in this experiment, the result could be obtained that the separation efficiency was about 95 v/v% under the conditions of 50 ppm of demulsifier, 10 seconds radiation time, and 1 minute settling time for the microwave chemical method. 相似文献
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克拉玛依油田百重七稠油处理站原油乳状液中含有大量泥砂,泥沙体积含量0.6‰~1‰,给原油脱水造成困难。本文以百重七原油处理站所处理的综合原油为研究对象,研制出破乳脱水用的KXDS破乳剂;同时考察了影响原油破乳脱水的几个因素,确定出最佳破乳温度和破乳剂最佳加量。KXDS破乳剂应用于现场后,破乳剂用量由120 mg/kg降低到80 mg/kg,破乳脱水温度由85℃降低到65℃,脱后原油达到外输优质标准,污水水质达标。 相似文献
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Wei Liu Bing Xiao Guolong Yang Yanlan Bi Fusheng Chen 《European Journal of Lipid Science and Technology》2020,122(2)
Aqueous enzymatic extraction (AEE) is an environmentally friendly edible‐oil‐extraction process that can also provide edible protein. However, the AEE process may form a stable emulsion in most cases, which seriously limits the large‐scale industry applications for producing vegetable oils. In this study, the salt‐assisted microwave radiation demulsification of the oil‐rich emulsion prepared with AEE from peanuts is investigated. The microwave demulsification method is compared with other conventional demulsification methods, including heating, and freezing–thawing. The salt‐assisted microwave demulsification of the emulsions shows a greater free oil yield than conventional heating demulsification. Moreover, the microwave demulsification shows a similar free oil yield in less time than freezing–thawing method. Under the optimal operating conditions of demulsification, the free oil yield can reach 92.3% with CaCl2‐assisted microwave demulsification for only 2 min. In addition, the oxidative properties and the fatty acid compositions of the demulsified peanut oil are investigated. No significant difference in the fatty acid composition is observed among salt‐assisted microwave, freezing–thawing, and heating demulsified oil. The oxidative properties of the salt‐assisted microwave demulsified peanut oil is better than the conventional heating demulsified oil. Thus, salt‐assisted microwave demulsification provides a quick and effective demulsification method to obtain vegetable oils with high quality. Practical Applications: Aqueous enzymatic extraction (AEE) is an environmentally friendly edible‐oil‐extraction process. To solve the problem of stable emulsion formed during AEE process, the salt‐assisted microwave demulsification of the oil‐rich emulsion prepared with AEE is developed with high efficiency (demulsification for 2 min). In addition, the oxidative properties of the microwave demulsified oil is better than the conventional heating demulsified oil. 相似文献
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超声波原油破乳是一种很有发展前景的新型破乳方法,文中给出了超生波原油破乳的基本原理,利用超声波对原油在实验室进行了破乳脱水实验,研究了声强、频率、温度、辐照时间对超声波原油破乳脱水的影响。试验结果表明,超生波参数有一个最佳值或范围,声强为0.61 W/cm2、频率20 kHz、辐照时间5~10 min。 相似文献
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The accurate prediction of the viscosity of emulsions is highly important for oil well exploitation. Commonly used models for predicting the viscosity of water‐in‐oil (W/O) emulsions composed by two or three factors cannot always fit well the viscosity of W/O emulsions, especially in the case of non‐Newtonian W/O emulsions. An innovative and comprehensive method for predicting the viscosity of such emulsions was developed based on the Lederer, Arrhenius, and Einstein models, using experimental data. Compared with the commonly applied W/O emulsion viscosity models, the proposed method considers more factors, including temperature, volume fraction of water, shear rate, and viscosity of the continuous (oil) and dispersed phase (water). Numerous published data points were collected from the literature to verify the accuracy and reliability of the method. The calculation results prove the high accuracy of the model. 相似文献
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Ahmad Hafiidz Mohammad Fauzi Md Nabil Ab Adzim Saifuddin Farizul Hafiz Kasim Muhamad Husaini Abu Bakar Zaki Yamani Zakaria Mohamad Zailani Abu Bakar 《化学工程与技术》2019,42(9):1797-1804
Computational fluid dynamics (CFD) simulation was applied to simulate the dilution of undiluted crude oil (UCO) in a dilution tank of a palm oil mill. Fluid flow and mixing characteristics were examined. Considering the mixing behavior, the mixing of dilution water and UCO occurred as soon as these fluids entered the dilution tank, and the oil mass fraction in the mixture decreased gradually towards the outlet of the tank. Meanwhile, the velocity of dilution water and UCO declined as the fluids moved from their respective inlets. The intensity of turbulence flow remained until near the tank outlet. For the parametric study, the oil mass fraction of diluted crude oil (DCO) increased with higher UCO flow rate and oil mass fraction in the UCO but declined with higher dilution water flow rate. 相似文献
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油水界面行为对原油乳状液破乳的影响 总被引:10,自引:0,他引:10
测定了在破乳剂作用下原油乳状液的油水界面张力,界面膜强度及破乳脱水率,结果表明,界面张力的变化与体系的初始状态有关,它反映了破乳剂分子在界面上的吸附程度,界面张力的高低不能作为破乳剂破乳效果的依据。具有较强的油水界面吸附能力而又能显著降低界面膜强度的破乳剂分子,能达到较好的破乳效果。 相似文献
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《分离科学与技术》2012,47(8):1159-1166
Oil-in-water nanoemulsions were developed and evaluated for effectiveness in breaking down crude oil emulsions. The nanoemulsions were prepared using two types of ethoxylated nonionic surfactants: nonylphenol and lauryl ether, at a concentration of 12 wt%, and the solvent xylene as the oil phase, at different concentrations (5, 7, and 10 wt%). The results of the demulsification tests showed that the nanoemulsions developed are a viable alternative to break down petroleum emulsions, with efficiency ranging from 90 to 95%. Also, the greater the xylene concentration in the nanoemulsion, the faster the demulsification process was. 相似文献
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The influence of the emulsification process on the microstructure and physical stability of model water‐in‐oil‐in‐water (W/O/W) emulsions formulated with a green solvent and a mixture of amphiphilic copolymers as emulsifiers was investigated. Emulsions were prepared by applying a homogenization step with a rotor‐stator device followed by high‐pressure homogenization. Viscous flow tests, transmitted light optical microscopy, globule size distribution (GSD), and multiple light scattering (MLS) measurements were carried out. The GSDs obtained were the result of a recoalescence due to overprocessing and the coalescence of inner droplets with the outer water phase. MLS detected a main destabilization mechanism by creaming. The passing of the emulsion through a high‐pressure homogenizer (HPH) significantly delayed the creaming process. 相似文献