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   萃取因数 的翻译结果: 查询用时:0.313秒
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萃取因数
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     And the temperature range was selected from 30℃ to 40℃. The technique conditions (including the extraction time, parallel, the emulsification status control), and basic parameters (including the saturated concentration 、 distributive ratio, and extraction efficiency) were confirmed by the experiments.
     通过试验确定了萃取的工艺条件(包括萃取时间、相比和控制乳化条件)和基本参数(包括饱和浓度、分配比和萃取因数),并根据实验结果建立了数学模型,以便直接求得不同相比和温度条件下所需的错流、逆流级数。
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  相似匹配句对
     HOP EXTRACTION
     啤酒花的萃取
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     Supercritical Extraction
     超临界萃取
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     n -- compression curve factor;
     n --压缩曲线因数
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     A Method of Computing Quality Factor of Resonant Circuits
     谐振电路品质因数的计算
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  extraction factor
For cross-current extraction, the extraction factor for free fatty acids was constant in each extraction stage.
      
As for the enrichment of atrazine, C18 silica achieved greater extraction factor than multiwalled carbon nanotubes.
      
A 100-fold extraction factor could be achieved under the optimal column conditions.
      


The extraction equilibrium relations of the system TbCl_3-DyCl_3-HCl-H_2O-HEH (EHP)-kerosine were studied. The distribution ratio is a function of three variables: the total rare earth concentrations (x_1), the acidities (x_2)and the mole fractions of Tb or Dy(x_3). Different forms of models were established:(1) Models with total rare earth concentration separating into two sectionsD=e~(a_1+a_2x_2+a_4x_2x_3+a_6x_3)X_1~(a_5+a_3x_2)(2) Models with mole fractions separating into three sectionsD=a_1x_1~(a_2+a_3lnx_1+a_4x_3)e~(a_5x_2+a_6x_3)...

The extraction equilibrium relations of the system TbCl_3-DyCl_3-HCl-H_2O-HEH (EHP)-kerosine were studied. The distribution ratio is a function of three variables: the total rare earth concentrations (x_1), the acidities (x_2)and the mole fractions of Tb or Dy(x_3). Different forms of models were established:(1) Models with total rare earth concentration separating into two sectionsD=e~(a_1+a_2x_2+a_4x_2x_3+a_6x_3)X_1~(a_5+a_3x_2)(2) Models with mole fractions separating into three sectionsD=a_1x_1~(a_2+a_3lnx_1+a_4x_3)e~(a_5x_2+a_6x_3) for middle section of Tb and DyD=a_1x_1~(a_2+a_3lnx1+a_4x_2)e~(a_5x_2) for high Tb and high Dy sections(3) Model of individual Tb or DyD=a_1x_1~(a_2+a_3lnx_1+a_4x_2)e~(a_5x_2)The relative errors of these models are 3.18~5.16% and the correlation coefficients are 0.9928~0.999. It is interesting that the models of hith Tb or high Dy (mole fraction of Tb or Dy>0.9) are in the same form as that of individual Tb or Dy.The extraction equilibrium curves of the two phases, the different curves of distribution ratios of Tb-Dy binary and mono systems with the change of acidities, and the curves of the organic rare earth concentrations with the change of mole fractions were drawn by calculating with these models. It is observed that the presence of Dy in Tb decreases D_(Tb), and Tb in Dy increases D_(Dy). The curves of D in high Tb or high Dy with change of, aqueous acidities coincide with that of individual D_(Tb) or D_(Dy)·D_(Dy) curve of low Dy in high Tb are much higher than that of individual D_(Dy), and D_(Tb) curve of low Tb in high Dy are lower than that of individual D_(Tb). It means that in binary rare earth system, the presence of small quantity of other element has only very little effect to the D of main element, and it can be neglected, but the D of element in small quantity is affected by the main element. When there's large quantity of Tb, as D_(Tb) is smaller than D_(Dy), the quantity extracted is decreased as compared with individual Dy, the acidity of equilibrium aqueous phase is lower and the free extractant increased, more Dy can be extracted, D_(Dy) is increased. On the contrary, D_(Tb) is decreased by the same reason. That is why the separation factor in binary system is larger than that calculated from mono system.Some valuable informations were investigated for developing an optimization Process:(1) Factors affecting the extraction processes. The effects of phase ratios, feed concentrations and the position of feed stage were studied. It is observed that in feed stage the rare earth concentration in organic phase must be the highest and the acidity in aqueous phase must be the lowest. The feed stage must be the stage where the composition of the entering aqueous phase is equal or near to the feed composition.(2) The relation between the extraction factor and the separation effect. Assuming that the extraction factors of the extraction and scrub sections are equal, and the distribution ratios are unchanged, L. Alders indicated that the mininum number of stages occurs when EB=1/K (i.e.E_A.E_B=1). But in practical extraction process, it is impossible to obtain the equal extraction factors. Assuming the distribution ratios are unchanged, calculating by L. Alders formula for non-extracted fraction, in certain quantity of feed, the mininum number of stages for certain separation occurs when E_A·E_B of both sections deviate from 1 in the same degree. In practical extraction processes as simulated with these models of the system studied. The separation effect is the best when the deviations of E_A·E_B from 1 are in the same degree in both sections. The separation effect is better when E_B·E_B in scrub section equals or closes to 1. If both E_A and E_B in extraction section are<1, the separation effect is poor.An optimization process for the separation of Tb-Dy for the system studied was suggested according to these informations.

本文研究了TbCl_3-DyCl_3-HCl-H_2O-P507体系的萃取平衡关系,关联了分配比模型:(1)以水相中稀土总浓度的分区模型;(2)以摩尔分数的分区模型;(3)铽和镝的模型。利用上述模型研究了铽镝二元体系的萃取行为,其与单一铽或镝相比,由于第二元素的存在导至了分配比、分离因数和有机相的稀土浓度的变化。利用水相稀土浓度的分区模型,进行了分馏萃取静态特性模拟。探索了影响分离工艺的因素、研究了萃取因数与分离效率的关系和在实际中达到材料消耗低和分离效率高的最优条件。提出了达到铽>95%和镝>99.5%的最优分离工艺。

 
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