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1.
曲红梅  白鹏  周立山  杨志才 《化工学报》2004,55(6):1006-1010
To evaluate the effect of two liquid phase on the separation of musks mixture, the phase equilibria of musk ketone musk xylene dimethyl sulfoxide heptane system were studied for the first time. The whole and every part of the phase equilibrium for the quaternary system were shown by three-dimensional phase diagrams, the liquid-liquid equilibria, solid-liquid equilibria and solid-liquid-liquid equilibria of the quaternary system were also shown. As a result, the compositions of musks in the equilibrium liquid phases were different from those in the feed, that is, musk ketone was enriched in dimethyl sulfoxide phase while musk xylene was enriched in heptane phase. So these equilibrium liquid phases were useful in separating musk ketone and musk xylene. On the basis of these results, a new process “two liquid phase extractive crystallization” was proposed to separate the eutectics of musk ketone and musk xylene.  相似文献   

2.
曲红梅  周立山  白鹏 《日用化学工业》2005,35(3):142-144,148
为了判断酮麝香、二甲苯麝香固相存在状态,改进Lennard-Jonnes位能函数后得到了适用于极性和非极性分子的位能函数式,计算得到酮麝香、二甲苯麝香体系相互作用能量参数λ,结合NRTL方程计算确认酮麝香、二甲苯麝香为简单低共熔体系,采用差分扫描量热热分析法进行了实验验证。  相似文献   

3.
本文计算并测定了酮麝香、二甲苯麝香、二甲基亚砜(或乙腈)和庚烷(或环己烷)四元体系的液液相平衡,试验结果与计算值基本吻合。平衡双液相中两种麝香的比例不同于原料,两液相中两种麝香分别得到了富集,其中二甲基亚砜(或乙腈)相中富含酮麝香、庚烷(或环己烷)相中富含二甲苯麝香,这种液相分相可用于分离麝香混合物。本文的研究为麝香混合物的分离提供了理论指导。此外,采用本文的方法还可以预测较难测定的多元固、液混合物的相平衡关系。  相似文献   

4.
对组分处于低共熔点的麝香体系提出了一种新的萃取方法———双液相萃取结晶。利用修正的UNIFAC模型对麝香在不同溶剂中的平衡数据进行预测,根据相平衡数据对各种溶剂进行比较,从理论上筛选出麝香体系合适的萃取溶剂,再进行实验验证。结果表明,麝香混合物在加入2种溶剂(乙腈+环己烷)完全溶解后,出现明显的分相,在不同的相中麝香的比例均比初始比例发生了很大的变化,得到了理想的富集,这样就使每种麝香更容易分离。  相似文献   

5.
为了开发低共熔组成酮麝香、二甲苯麝香混合物溶液结晶新过程,计算得到酮麝香、二甲苯麝香、溶剂三元相图。在此基础上研究了麝香混合物溶液结晶分离方法,提出了轮流加入乙腈和庚烷从低共熔组成麝香混合物中,分级冷却结晶分离得到2种产品的过程。由三元相图得到理论产量并进行试验验证,结果表明加入乙腈一级结晶可得到纯度为97.5%的二甲苯麝香,加入庚烷二级结晶后酮麝香的纯度为98.1%。  相似文献   

6.
溶液结晶用于分离人造麝香的研究   总被引:3,自引:0,他引:3  
高静  杨志才 《化学工程》1999,27(5):34-37
对酮麝香溶液结晶的分离进行了系统地研究, 给出了全部计算公式, 同时克服了传统结晶器的缺点, 设计了一种可以实现多级分离的结晶器, 并建立了该结晶器的实验装置, 它集结晶、过滤、洗涤于一体。实验结果与计算结果对比令人满意  相似文献   

7.
研究了根据酮麝香、1,3-二甲基-2,4-二硝基-5-叔丁基苯晶体生长速度的不同,从对二者均达到饱和的溶液中分离得到1,3-二甲基-2,4-二硝基-5-叔丁基苯晶体的过程,计算了晶体生长速度并进行了实验验证。  相似文献   

8.
固体溶液的结晶提纯   总被引:1,自引:0,他引:1  
简单介绍了连续结晶与间歇结晶方法。重点说明了有机物的间歇结晶分离问题,根据作者实践经验,要使间歇结晶获得合格的产品和较高的收率,必须掌握好以下几个问题:相图的使用、“发汗”问题、结晶速度和传热系数。  相似文献   

9.
含麝香体系多元溶液固液平衡研究   总被引:2,自引:1,他引:2  
测定了酮麝香、二甲苯麝香在单一溶剂和混合溶剂中的溶解度以及酮麝香的中间体 2 ,6 二甲基 4 叔丁基苯乙酮在不同溶剂中的溶解度 ,并且测定了多溶质多溶剂体系的固液平衡 ,采用UNIFAC活度系数法进行以上体系的固液平衡计算 ,计算结果与实验测定结果吻合良好。采用文中提出的方法不仅可以预测多溶质体系在溶液中共同达到饱和时的溶解度 ,而且可以预测部分溶质达到饱和时的溶解度 ,这对于溶液结晶具有重要的指导意义  相似文献   

10.
实验结果显示覆盆子酮在正丙醇-水的混合溶剂中进行冷却结晶时会发生油析现象,而油析现象的发生会对最终结晶产品的质量造成一定的影响.为了抑制覆盆子酮结晶过程的油析现象,对这一现象进行了系统研究.首先应用FBRM对覆盆子酮在正丙醇-水混合溶剂中的油析热力学数据进行了实验测定,确定了油析曲线、澄清曲线、溶解度曲线与超溶解度曲线...  相似文献   

11.
考察不同二甲苯含量时,醇酸树脂、氯化聚丙烯与二甲苯混合液的分层情况,测定其分层一中各成分的组成,作出三元体系相图,从而更全面地了解醇酸树脂、氯化聚丙烯和二甲苯三者的相容性。  相似文献   

12.
一种利用脱氮硫杆菌的同步脱硫反硝化新工艺研究   总被引:4,自引:0,他引:4  
Thiobacillus denitrificans, a kind of autotrophic facultative bacteria, can oxidize sulfide into elemental sulfur or sulfate when nitrate was adopted as its electron accepter and carbon dioxide as its carbon resource under anoxic or anaerobic environment. In this way, nitrate is converted into nitrogen. In addition, ThiobaciWus denitrificans can accumulate sulfur extracellularly. In this study, in a process of simultaneous desulfurization and denitrification, a strain of Thiobacillus denitriificans is employed as sulfur-producer in the treatment of wastewater containing sulfide and nitrate. The key factors affecting this process are investigated through batch tests. The experimental results indicate that the sulfide concentration and the ratio of sulfide to nitrate (S2-/NO3-) in the influent are the key factors, and their suitable values are suggested to be 5/3 and no more than 300mg·L-1, respectively, in order to achieve high conversion of sulfur.  相似文献   

13.
螺旋片导流式气液分离器的数值模拟与试验研究    总被引:1,自引:0,他引:1  
The gas/liquid spiral separator, a key component in the compressed air system, was used to remove liquid and oil from gas stream by centrifugal and gravitational forces. To optimize the design of the separator, the relationship between the performance and structural parameters of separators is studied. Computational fluid dynamics (CFD) method is employed to simulate the flow fields and calculate the pressure drop and separation efficiency of air-liquid spiral separators with different structural parameters. The RSM (Reynolds stress model) turbulence model is used to analyze the highly swirling flow fields while the stochastic trajectory model is used to simulate the traces of liquid droplets in the flow field. A simplified calculation formula of pressure drop in spiral structures is obtained by modifying Darcy's equation and verified by experiment.  相似文献   

14.
The solid-liquid equilibria of musk ketone musk xylene, musk xylene 1,3-dimethyl-2,4-dinitro-5-tert-butyl benzene are measured by differential scanning calorimeter (DSC), these systems are proved to be simple eutectics. Moreover the melting points and the fusion enthalpies of musk ketone, musk xylene and 1,3-dimethyl-2,4-dinitro-5-tert-butyl benzene are also measured by the DSC. These solid-liquid equilibrium data and the heats of fusion are reported for the first time. Then UNIFAC model is used to correlate the solid-liquid equilibrium data.It is shown that the solid-liquid equilibria of musk systems can be predicted bv the UNIFAC model.  相似文献   

15.
An analytical equation of state (EOS) for hard core Asakura-Oosawa (AO) fluid is established by combining the AO potential, the first-order perturbation theory and the radial distribution function (RDF) for the hard sphere fluid.The phase equilibria are studied by using the renormalization-group (RG) theory. The obtained results agree well with the simulation data. Investigation shows that the attractive range parameter plays an important role in the phase equilibria for AO fluid.  相似文献   

16.
In this paper, a model is presented to correlate and predict the swelling behavior of hydrogels in aqueous solutions of electrolytes. The model is a combination of VERS-model, “phantom network“ theory and “free-volume“ contribution. The VERS-model is used to calculate Gibbs excess energy; “phantom network“ theory to describe the elastic properties of polymer network, and “free-volume“ contribution to account for additional difference in the size of the species. To test the model, a series of N-isopropylacrylamide based hydrogels are synthesized by free radical polymerization in oxygen-free, deionized water at 25~C under nitrogen atmosphere. Then, the degree of swelling of all investigated gels as well as the partition of the solute between the gel phase and the surrounding coexisting liquid phase are measured in aqueous solution of sodium chloride. The model test demonstrates that the swelling behavior correlated and predicted by the model agrees with the experimental data within the experimental uncertainty. The phase transition appeared in the experiment, and the influences of the total mass fraction of polymerizable materials ξgel as well as the mole fraction of the crosslinking agent YCR on the swelling behavior of IPAAm-gels can also be predicted correctly. All these show the potential of such model for correlation and prediction of the swelling behavior of hydrogels in aqueous solutions of electrolytes.  相似文献   

17.
The direct sulfation of limestone from different sources in Iran was studied in a thermogravimetric analyzer under atmospheric pressure. All limestone samples tested have higher than 97% CaCO3. Experimental conditions were as follows: particle size levels ranging from 1.6μm to 7.8μm, four level reaction temperatures (700°C,750°C, 800°C and 850°C), and two SO2 concentrations (2.4 × 10-3 and 3.2 × 10-3 mol.mol-i). The particle size and temperature showed dominant influences on the rate and level of conversion while the effect of SO2 concentration was weak. The shrinking core model can be used to describe the behavior of the sulfation process. The reaction kinetics and diffusion mechanism are both important in controlling the rate of the process. The two key parameters of the model, chemical rate constant Ks and effective diffusion coefficient Deff were obtained. Model predictions are in good agreement with the experimental data.  相似文献   

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