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《应用化工》2022,(3):660-664
表面活性剂的使用能够提高乳状液的稳定性并降低稠油的黏度。研究了两性表面活性剂CAB-35和有机碱TEOA的二元体系对稠油黏度和稳定性的影响,考察油水比、温度、搅拌速度对乳状液黏度和液滴平均粒径大小的影响。结果表明,当CAB-35质量分数为0.75%时乳状液黏度最小为17.79 mPa·s;添加TEOA可以提高稠油乳状液的稳定性,分水率达到11.3%,降黏率达到95.24%。随着油水比的增加,乳状液液滴粒径变小,黏度增大,乳状液更稳定。温度升高,乳状液液滴发生聚并,黏度减小,乳状液稳定性变差。随着搅拌速度的增加,能形成较小的液滴,黏度增大,乳状液稳定性增强。 相似文献
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Amphiphilic molecules of anionic sodium dodecul sulfate (SDS) were used to modify the hydrophobicity of cationic gibbsite platelets in aqueous foams prepared by mechanical frothing. Contact-angle (θ) measurements revealed that the originally hydrophilic particles with an apparent θ of ~30° become partially hydrophobic, θ > 50°, as the SDS concentration increased above ~1 mM. Stable foams with up to 20 h duration were rendered with the preferential adsorption of the partially hydrophobized platelet particles (SDS ≥ 2.9 mM, solids concentration of 10 vol.%) at the water–air interface so that coalescence and disproportionation (i.e., Ostwald ripening) of the air-in-water (a/w) bubbles are suppressed. Macroporous alumina foams consisting of both open and closed pore structure, a mean cell diameter of about 300 μm, a sharp cell wall, and a relative porosity of 90% were produced by firing the dried gibbsite foams to 1500 °C in air atmosphere. 相似文献
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有机硅乳液稳定性的研究 总被引:1,自引:1,他引:1
以阳离子型乳液聚合为例,详细讨论了聚合反应因素及环境因素对环氧改性有机硅乳液稳定性的影响。结果表明:在聚合反应温度为65℃、催化剂的用量为总加料量的0.3%~0.5%、硅烷偶联剂的用量为D4质量的3%~5%、乳化剂用量为总加料量的10%、阳/非离子型乳化剂的质量比为1.5~1.8、D4与水的质量比为0.3~0.4条件下,制得的环氧改性有机硅乳液稳定性良好;采取急冷的方式中止聚合反应,并以醋酸中和至pH值为6~7,有利于环氧改性有机硅乳液稳定性的提高。 相似文献
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《化学工业与工程技术》2018,(1):57-61
采用显微镜法和瓶试法考察了三元磺化改性聚丙烯酰胺对3种模拟采出液乳化状态和浓相体积分数的影响,研究了新型三元磺化改性聚丙烯酰胺浓度对3种模拟乳状液稳定性的影响规律。结果表明:三元磺化改性聚丙烯酰胺分子的两性离子特性使其在油水界面具有较好的吸附性能,能较好地增加油水界面膜的黏度;随着聚丙烯酰胺浓度和模拟乳状液总含水率的增加,乳状液的稳定性增加;随着驱油组分的增加,模拟乳状液的稳定性增加。三元磺化改性聚丙烯酰胺适合于弱碱三元复合体系,可用于高含水区油藏的驱油。 相似文献
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以2-甲基-5-羧基吡嗪(2-mpac)为配体,合成了一个铜的单核配合物Cu(2-mpac)2(H2O).3H2O(1)。并利用元素分析、IR、X-射线单晶衍射等手段对配合物(1)进行了结构及理化性质表征。晶体学数据:三斜晶系,P-1空间群,a=0.833 7(5)nm,b=1.058 3(6)nm,c=1.125 0(7)nm,α=64.399(11),β=85.352(13),γ=68.436(12)°,V=0.828 9(9)nm3,Z=2,S=0.801,最终残差因子[I>2σ(I)]R1=0.066 6,wR2=0.056 9,对于全部数据R1=0.214 2,wR2=0.068 2。 相似文献
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以氟磺酰基氧基苯(FSOB)作为电解液添加剂,用于LiNi0.8Mn0.1Co0.1O2(NCM811)/石墨软包电池中.充放电测试和电化学测量的结果表明,FSOB的添加提高了该锂离子电池的常温、高温和低温长循环性能,令其可工作于?20~60°C的温度范围内. 相似文献
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V. A. Zabaikin E. V. Perkov P. K. Tret’yakov 《Combustion, Explosion, and Shock Waves》1997,33(3):301-305
The effect of small amounts of inert and reacting additives (such as hydrogen peroxide, its decomposition products,CO
2, etc.) on the ignition and combustion of hydrogen in a high-temperature supersonic air flow was studied experimentally. It
is shown that direct doping of the fuel has little effect on the combustion ofH
2, whereas injection of hydrogen peroxide or small amounts of pure hydrogen ahead of the nozzle decreases suddenly the ignition
delay, indicating the profound effect of the reaction products. Comparative experiments with inert additives showed that these
additives only lead to a decrease in the air-flow temperature.
Institute of Theoretical and Applied Mechanics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated
from Fizika Goreniya i Vzryva, Vol. 33, No. 3, pp. 70–75, May–June, 1997. 相似文献