共查询到20条相似文献,搜索用时 46 毫秒
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本文首次报道一种具有特殊形貌的液晶微胶囊,胶囊表面部分区域光滑致密,其余区域粗糙且存在孔隙。文章基于相分离机理对微胶囊形成过程进行分析,并通过加入共溶剂实现了微胶囊表面形貌的可控调整。 相似文献
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不同溶剂神府煤超临界萃取研究 总被引:2,自引:0,他引:2
本文以我国新开发的特大煤田——神府煤为研究对象,在半连续装置上,以水、甲苯以及水和甲苯中分别加入少量四氢萘为溶剂进行超临界萃取研究。详细地考察了无机溶剂水、有机溶剂甲苯及供氢溶剂四氢萘对萃取过程的影响。实验结果表明,超临界萃取是神府煤的有效利用途径之一,萃取物产率是铝甑焦油产率的2.65~5.72倍,萃取物中以预沥青烯为主要族组分;以甲笨为溶剂,萃取率高于以水为溶剂的;在水及甲苯中加入少量四氢萘,均可以大幅度地提高萃取率。 相似文献
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膜萃取防止溶剂污染的优势 总被引:5,自引:0,他引:5
本文以3%TBP/苯酚/水为实验体系在不同的膜器中对膜萃取过程中料液对萃取剂的夹带,即溶剂的二次污染进行了研究。在保持膜两侧压降不变的情况下对进口和出口处料液的COD值进行了测定,并与传统的溶剂萃取方法相比较。结果表明,膜萃取中料液中溶剂只有少量的夹带,并且夹带量与操作条件和膜构件基本无关。 相似文献
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《分离科学与技术》2012,47(3):410-415
The extraction yield of fucoxanthin from Phaeodactylum tricornutum, a marine diatom, was investigated for 16 h as the functions of the kind of solvent, temperature, and solvent/diatom weight ratio. Acetone, ethanol, and ethyl acetate were used as solvents for the extractions. The extraction yield increased in a saturation manner with the extraction time when the extraction temperatures were 30°C and 40°C. However, the extraction yield increased with time in the early stage of the extraction; thereafter, it was stagnant or decreased with time in the late stage at 50°C, 75°C, and 85°C. The thermal deterioration would suppress the extraction yield in the late stage at those higher temperatures. The maximum extraction yield was obtained at 40°C and no significant benefit in the extraction yield was obtained when the extraction period was extended over 12 h. The extraction yield markedly increased when the solvent/diatom ratio increased from 3/1 to 6/1, but no marked benefit was obtained when the amount of solvent increased over the ratio of 6/1. Ethanol was the most effective solvent in the extraction of fucoxanthin, and the extraction yield was greater in the order of ethanol > acetone > ethyl acetate. 相似文献
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使用一套溶剂萃取平衡的试验装置,选择膦酸三丁酯(TBP)为萃取剂,苯为稀释剂,系统地测定了钨的溶剂萃取平衡及萃取条件对萃取平衡分配的影响,可为工业过程设计、工程优化和计算机模拟提供依据。 相似文献
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湿法冶金技术对矿物资源的可持续开发、资源的充分利用和环境保护等方面,发挥了很大的作用,随着湿法冶金技术的不断发展和完善,其在冶金生产中占重要的地位。作为湿法冶金的重要手段的溶剂萃取技术也得到广泛的研究和应用,本文介绍了湿法冶金中的萃取剂的历史发展过程,并将传统萃取剂与双端萃取剂进行对比。 相似文献
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Abstract The extraction behavior of Zn(II) and Cu(II) in acetate media has been investigated using dodecylhydroxydiphosphonic acid, DHDPA, which was previously synthesized and characterized. The extraction of both cations was carried out in different media with the addition of CH3COOH, HCl or H2SO4 at different pH. The maximum extraction yield of 80% for zinc, was obtained in one step after the addition of sulfuric acid at pHi=5.5 and for copper after the addition of 10 mg of sodium acetate. The authors plan additional tests using polar solvents. 相似文献
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We performed neutron polarization analysis (NPA) of extracted organic phases containing complexes, comprised of Zr(NO3)4 and tri-n-butyl phosphate, which enabled decomposition of the intensity distribution of small-angle neutron scattering (SANS) into the coherent and incoherent scattering components. The coherent scattering intensity, containing structural information, and the incoherent scattering compete over a wide range of magnitude of scattering vector, q, specifically when q is larger than q* ≈ 1/Rg, where Rg is the radius of gyration of scatterer. Therefore, it is important to determine the incoherent scattering intensity exactly to perform an accurate structural analysis from SANS data when Rg is small, such as the aforementioned extracted coordination species. Although NPA is the best method for evaluating the incoherent scattering component for accurately determining the coherent scattering in SANS, this method is not used frequently in SANS data analysis because it is technically challenging. In this study, we successfully demonstrated that experimental determination of the incoherent scattering using NPA is suitable for sample systems containing a small scatterer with a weak coherent scattering intensity, such as extracted complexes in biphasic solvent extraction systems. 相似文献
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预分散溶剂萃取技术的研究进展 总被引:6,自引:0,他引:6
概述了预分散溶剂萃取过程的发展现状,探讨了预发解溶剂萃以过程中所使用的胶质液体泡沫和胶质气体泡沫的制备,性性和影响泡沫形成的因素以及预分解溶剂萃取研究可能的发展方向和应用前景。 相似文献