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椰油醇和正辛醇从水相中萃取螺旋霉素的表观分配系数 总被引:1,自引:0,他引:1
椰油醇和正辛醇从水相中萃取螺旋霉素的表观分配系数陶中东徐志南岑沛霖(浙江大学化学工程系,杭州310027)关键词正辛醇椰油醇螺旋霉素分配系数1前言螺旋霉素(SPM)为大环内酯类抗生素,主要用于抗革兰氏阳性菌感染。经过乙酰化后的乙酰螺旋霉素,是目前市场... 相似文献
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研究了伯胺N1923萃取剂对螺旋霉素和红素的萃取性能,实验结果表明它具有萃取率高、适用pH范围较大、不乳化、易分相、易反萃、用量不且可多次循环使用等优点,显示出了作为工业萃取剂的良好特性。适宜的萃取条件分别为对螺旋霉素用5.0%N1923,pH=9.56,O/A=1:1(V/V),萃取率为90.8%;萃取红霉素用7.5%N1923,pH=9.50,O/A=1:1,萃取率为92%。 相似文献
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建立了乙醇- K2HPO4双水相体系萃取螺旋霉素的方法,对测得的双水相体系的双节线数据进行拟合,并系统研究了K2HPO4浓度、乙醇浓度、螺旋霉素初始浓度、萃取温度和体系pH对分配系数和萃取率的影响。结果表明,双水相萃取螺旋霉素是自发进行、吸热熵增的过程。当K2HPO4质量分数为20%,乙醇质量分数为16%,萃取温度为25℃,体系pH为9.2~9.5时,分配系数可达36.66以上,萃取率可达97.11%以上。其中,当体系"pH = 9.5" 时,分配系数达到47.52,萃取率达到97.97%。乙醇-K2HPO4双水相体系萃取螺旋霉素的纯化倍数及萃取率高,而且所用成相物质乙醇和K2HPO4可以回收重复使用,避免了二次污染,为处理含螺旋霉素的异戊酰螺旋霉素生产废水提供了新的方法。 相似文献
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采用竞争吸附法分离异戊酰螺旋霉素Ⅱ和Ⅲ。分别采用扩展Langmuir、扩展Langmuir-Freundlich和扩展Jovanovic-Freundlich模型拟合了稀溶液中异戊酰螺旋霉素Ⅱ和Ⅲ在HZ820上的竞争吸附热力学行为。其中扩展Jovanovic-Langmuir模型取得了最好的结果。并研究了温度和pH值对HZ820吸附异戊酰螺旋霉素Ⅱ和Ⅲ的吸附量和选择性的影响,实验表明:提高温度利于异戊酰螺旋霉素Ⅱ和Ⅲ在HZ820上吸附量的增大和选择性的提高,而提高pH值利于增大异戊酰螺旋霉素Ⅱ和Ⅲ在HZ820上的吸附量,而选择性则在pH值接近6.5时趋于最大值。 相似文献
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研究了螺旋霉素(SPM)发酵液预处理工艺的特性,考察了温度、酸度、絮凝剂和凝聚剂等对过滤速度和滤液效价的影响.实验发现过滤液效价随过滤温度和pH值不同而变化,在pH=5.5时有一最佳峰值.温度升高有利于过滤收率的提高.同时,在溶液中存在蛋白质的溶解平衡,在过酸或过碱时会变性沉淀,pH=6.0~6.5时滤液蛋白质含量最少.实验还发现,不同絮凝剂影响滤液效价,以聚丙烯酰胺为最好,滤液效价可提高10%左右.外加溶剂也影响滤液效价,乙醇使效价降低,而丙酮和甲醛可使效价升高,最高可提高10%左右. 相似文献
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双水相萃取技术研究现状 总被引:5,自引:0,他引:5
近年来,双水相萃取(ATPE)已经发展成由计算机控制、在常规萃取设备中、能连续操作的分离技术。介绍了传统双水相体系(ATPS)和新型ATPS的特征、分相机理、工业应用的优缺点,指出寻找低成本易回收可循环利用的ATPS组成物质和对预分离物质有更高选择性的ATPS组成物质是研发新型ATPS的方向。论述了ATPS液液平衡的热力学模型、分配系数的关联方法,指出提高选择性及分离效率是ATPE应用研究的方向,指出总结分配系数影响因素规律、修正液液平衡的热力学模型是ATPE理论研究的方向。 相似文献
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应用液膜萃取法处理含酚工业废水 ,萃取与反萃取能同时完成 ,省时简便。且脱酚率高 ,应用该法优于传统萃取法 相似文献
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The n‐butane/water distribution constant is one of the key parameters in determining the extraction efficiency. Experimental results on 34 organic compounds illustrated that a fundamental linear relationship exists between the distribution constant and the aqueous solubility of the solute. The relationship can be broadly applied to many different classes of chemical compounds as well as to many different solvent extraction systems. The linear equation obtained by a regression method allows one to estimate the distribution constant and predict the result of butane extraction if the aqueous solubility of certain solute is available. 相似文献
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提出一种萃取法测定饱和配位数为2的混配配合物稳定常数的新方法.利用了有机相中混配配离子最大分布系数的性质,测定原理简单,且能得到满意的结果. 相似文献
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Juan Milanesio Pablo Hegel Yaocihuatl Medina‐González Séverine Camy Jean‐Stéphane Condoret 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2013,88(3):378-387
BACKGROUND: Microorganisms have often been considered for the production of oils and fats as an alternative to agricultural and animal resources. Extraction experiments were performed using a strain of the yeast Yarrowia lipolytica (Y. lipolytica), a high‐lipid‐content yeast. Three different methods were tested: Soxhlet extraction, accelerated solvent extraction (ASE) and supercritical carbon dioxide (SCCO2) extraction using ethanol as a co‐solvent. Also, high pressure solubility measurements in the systems ‘CO2 + yeast oil’ and ‘CO2 + ethanol + yeast oil’ were carried out. RESULTS: The solubility experiments determined that, at the conditions of the supercritical extractor (40 °C and 20 MPa), a maximum concentration of 10 mg of yeast oil per g of solvent can be expected in pure CO2. 10% w/w of ethanol in the solvent mixture increased this value to almost 15 mg of yeast oil per g of solvent. Different pretreatments were necessary to obtain satisfactory yields in the extraction experiments. The Soxhlet and the ASE method were not able to complete the lipid extraction. The ‘SCCO2 + ethanol’ extraction curves revealed the influence of the different pretreatments on the extraction mechanism. CONCLUSION: Evaluating the effectiveness of a given pretreatment, ASE reduced the amount of material and solvent used compared with Soxhlet. In all three cases, the best total extraction performance was obtained for the ethanol‐macerated yeast (EtM). Addition of ethanol to the solvent mixture enhanced the oil solubility. Oil can be extracted from Y. lipolytica in two different steps: a non‐selective ethanol extraction followed by TAG‐selective SCCO2 purification. © 2012 Society of Chemical Industry 相似文献
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《分离科学与技术》2012,47(2):303-318
Based on the systematic analysis of experimental data for liquid-liquid extraction of the substituted phenols, the F α and F μ parameters have been suggested to describe the dependence of log P 0 (P 0 is the distribution coefficient) from the energy of universal intermolecular interactions in solutions and the structural characteristics of solutions in non-polar and polar solvents correspondingly. The deviations from the dependences of log P0 = f(F α) and log P0 = f(F μ) show the contribution of specific interactions (H-bonds) to the process of extraction. The method is aimed at determination of the ionization constant of phenol (K a ) on the basis of phenol distribution between the water and non-water solvents, which do not mix up with water. It is shown that the рK a values of the substituted phenols obtained by the measurements in water and non-water solvents depend on σ0-constant. The influence of the amount of the same substituents in the phenol molecules on the рK a values was studied. 相似文献
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将氢化可的松母液解析为氢化可的松、表氢化可的松和6α-羟基RS三种组分,模拟了母液的表观分配系数。拟合结果与实验值符合较好,平均相对误差<5.5%。 相似文献
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