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综述了近年来复杂物系间歇精馏过程的研究进展,重点介绍了热敏物料、高凝固点物料和共沸物系的间歇精馏过程,讨论了这些新间歇精馏过程的特点及应用前景。 相似文献
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萃取精馏系统是精馏过程中常用的三种形式之一.完成此过程一般需要三个或者三个以上的精馏塔完成,且系统中流股耦合严重,故系统控制一直是国内研究的热点.文章就萃取精馏系统控制方面的研究进展做了概述. 相似文献
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用EDTA络合滴定法分析枪色镀层中锡和镍的含量。用酒石酸掩蔽锡和钼,用硫脲掩蔽铜,以EDTA直接滴定镍;用氨水把锡与镍、钼或铜等元素分离,并使锡与EDTA络合,再用氯化铵作解蔽剂,以硝酸铅溶液滴定释放出的EDTA,可得锡的含量。 相似文献
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对比研究了具有对称和不对称封头的两类聚醚型润滑油的性能。结果表明,两类聚醚型压缩机润滑油吸湿性小,两者的相溶性好;聚醚型润滑油封头率越高,吸湿性越小;相比而言,具有不对称封头的聚醚型润滑油比具有对称封头的吸湿性低,润滑性好。这为今后聚醚型润滑油向提高封头率以及聚醚的不对称封头方向发展提供参考。 相似文献
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In this work, the influences of gamma irradiation on the electrical and mechanical properties of the epoxy nanocomposites were studied. The exfoliation characteristics of epoxy nanocomposite material analyzed through TEM studies. It is shown that the impact and flexural strength of the material is high with epoxy nanocomposites and gets reduced with the gamma-irradiated specimen. The AC breakdown strength of the epoxy nanocomposites is high compared with the base epoxy resin. It is also observed that a reduction in permittivity and tan(δ) of epoxy resin added with 1 wt % of nanoclay. Increase in percentage of clay shows increase in permittivity and tan(δ). Gamma irradiation of epoxy nanocomposite material shows increase in permittivity. The volume resistivity of the material is high with epoxy nanocomposite and is less with gamma-irradiated specimen compared with virgin specimen. The impact strength and flexural strength indicates correlation with breakdown strength of the material. It is observed that the increase in applied voltage shows an increase in magnitude of the charge density in the insulation structure. With the gamma-irradiated specimen, the charge density (for the applied electric field) is less compared with the virgin specimen. Electric field analysis indicates that the electric field is uniform in the bulk volume of the epoxy nanocomposite material. The rate of charge decay is high with gamma-irradiated specimen compared with virgin specimen. It is realized that material with lower resistivity has faster decay of stored charge. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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季铵盐萃取草酸的机理 总被引:1,自引:0,他引:1
季铵盐可以直接从氰化浸出液中萃取金,但反萃困难. 酸性硫脲通空气体系能有效反萃季铵盐中的氰化金,向反萃液中添加草酸可以显著提高金的反萃效率. 实验发现在反萃过程中,草酸会被萃取进入有机相. 本文通过3个萃取模型分别拟合草酸的萃取反应并用红外光谱法研究了萃取机理,结果表明,季铵盐萃取草酸的机理主要为中性缔合,草酸的COOH基团与季铵盐的极性端作用,形成1:1型氢键萃合物,表观平衡常数2.12,还有少部分草酸以失去一个氢离子的二聚体形式与Cl–发生阴离子交换,与季铵阳离子形成1:2型离子对萃合物,表观平衡常数0.0031. 相似文献
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HDPE/mLLDPE混炼后的性能与结构 总被引:1,自引:0,他引:1
高密度聚乙烯/茂金属线性低密度聚乙烯(HDPE/mLLDPE)40/60共混物经混炼器混炼后的冲击强度比未经混炼器混炼的HDPE增加了96.2%,比未经混炼器混炼的mLLDPE增加了27.0%,其拉伸强度比未经混炼器的mLLDPE增加了49.1%。这表明在混炼器的强剪切分散作用下,HDPE,mLLDPE共混对HDPE和mLLDPE有显著的增韧作用。其微观结构测试表明,mLLDPE与HDPE形成了共晶结构,HDPE含量高的HDPE/mLLDPE共混体系试样内部的晶粒尺寸更为均一。 相似文献