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未反应核
相关语句
  unreacted core
    The adsorption of p-dihydroxybenzene and phenol on γ-Al_2O_3 is studied and the adsorption amount-time curve is simulated with the shrinkage unreacted core model. Based on the adsorption amount-time curve and the isothermal adsorption curve,the optimum adsorption conditions,properties and mechanism are explored.
    借用收缩未反应核模型动力学方程对改性-γAl2O3吸附对苯二酚、苯酚的吸附量-时间曲线在达到平衡之前进行了分析,结合pH-吸附量曲线、等温吸附曲线,探讨了-γAl2O3吸附水溶液中对苯二酚、苯酚的适宜条件、性能及机理。
短句来源
    Coking burning process of greater particle catalyst can be simulated by the particle-pellet model,homogeneous model and shrinking unreacted core model. These models have much greater errors to pellet zeolite catalyst.
    并指出大多数催化剂颗粒模型如粒子 颗粒模型、均匀模型、未反应核收缩模型等对大颗粒催化剂的烧焦再生过程能够较好地进行模拟 ,但对粒径微小的沸石催化剂烧焦再生的模拟误差很大。
短句来源
    On the basis of analyzing the control step for ice conversing to hydrate and introducing the sign function, the unreacted core shrinking model for hydrate formation was proposed.
    在对冰转化为水合物控制步骤分析的基础上,引入符号函数并提出一个改进的未反应核收缩模型来描述冰转化为水合物的动力学。
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  “未反应核”译为未确定词的双语例句
    The results showed that the adsorption kinetics of P-toluidime on 732 resin fitted well with shell—core model and the adsorptive processes were controlled by chemical reaction.
    实验结果表明,732树脂吸附对甲苯胺具有非均相未反应核收缩模型的特征,且化学反应为吸附的速率控制步骤。
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  unreacted core
The unreacted core shrinking (topochemical) and the homogeneous model are presented as the limiting cases between a reaction taking place on a sharp interface and one taking place in a diffuse manner throughout a pellet-matrix.
      
The roasting pellet exhibits a reacted shell surrounding the unreacted core.
      
The unreacted core kinetic model was applied to the results; and the energy of activation for the reaction was obtained from the Arrhenius plot as 31,100 cal/gmol of MoS2.
      
The rate of the reduction seems to be controlled by the chemical reaction between the product and the unreacted core existing in each of the small particles.
      
The results showed that the process follows the unreacted core-shrinking model with formation of a porous product layer.
      
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Models of FCC coked catalyst particles and coke burning dynamics were analyzed.It was pointed out that to study the coke burning reaction of coked catalyst must take the view point of macrodynamics.Not only intrinsic dynamics of coke burning must be considered,but the diffusion transfer resistance of gas phase in the process of coked catalyst burning considered as well.Coking burning process of greater particle catalyst can be simulated by the particle-pellet model,homogeneous model and shrinking unreacted core...

Models of FCC coked catalyst particles and coke burning dynamics were analyzed.It was pointed out that to study the coke burning reaction of coked catalyst must take the view point of macrodynamics.Not only intrinsic dynamics of coke burning must be considered,but the diffusion transfer resistance of gas phase in the process of coked catalyst burning considered as well.Coking burning process of greater particle catalyst can be simulated by the particle-pellet model,homogeneous model and shrinking unreacted core model.These models have much greater errors to pellet zeolite catalyst.Considering the characteristics of zeolite catalyst,a modified pellet-particle model was put forward and its physical structure,coke distribution and coke burning steps discussed in detail,supplying a basis for establishment and deduction of mathematical equation of the model.

对催化裂化结焦催化剂颗粒模型和结炭燃烧动力学进行了系统的分析和研究 ,指出研究结焦催化剂的烧焦反应过程必须采用宏观动力学的观点 ,既要考虑结炭燃烧的本征动力学 ,又要考虑结焦催化剂烧焦过程中气相组分的扩散传递阻力 ;并指出大多数催化剂颗粒模型如粒子 颗粒模型、均匀模型、未反应核收缩模型等对大颗粒催化剂的烧焦再生过程能够较好地进行模拟 ,但对粒径微小的沸石催化剂烧焦再生的模拟误差很大。根据沸石催化剂的特点 ,提出了修正的颗粒 粒子动态等温物理模型 ,并对该模型的物理结构、焦炭分布以及焦炭燃烧的步骤进行了详细的描述 ,同时也为该模型的数学方程的建立和推导提供了依据。

Polyhalite is a kind of resource of potassium.The key problem of extracting potassium from polyhalite is dissolution of potassium in lixiviant. This paper presents the fundamental study of a new method of exploiting leaching potassium from polyhalite deeply underground in Sichuan Nongle using CaCl 2 solution as solvent.The kinetic process of dissolving potassium from polyhalite was studied by investigating the influence of the leaching conditions such as concentrations of solvent (CaCl 2), mineral particle...

Polyhalite is a kind of resource of potassium.The key problem of extracting potassium from polyhalite is dissolution of potassium in lixiviant. This paper presents the fundamental study of a new method of exploiting leaching potassium from polyhalite deeply underground in Sichuan Nongle using CaCl 2 solution as solvent.The kinetic process of dissolving potassium from polyhalite was studied by investigating the influence of the leaching conditions such as concentrations of solvent (CaCl 2), mineral particle size,and temperature on the process of lixiviation through analysing potassium concentration in the lixiviation solution.The possible lixiviation process of polyhalite was discussed.The recovery of K increased with decreasing mineral particle size and could be higher than 80% under the experimental conditions(mineral particle size:0 42—1 mm,initial concentration of CaCl 2:5%, solid to liquid ratio=1/10,tempreture:288—373 K).The experimental results showed that the dissolution reaction order was first order.Apparent activation energy of the reaction calculated was 8 34 kJ·mol -1 .The paper establishes that the process controlled the dissolution process is diffusion through the ash layer, and the leaching behaviour can be modelled as a shrinking un reacted core.The kinetic process of dissolving potassium from polyhalite is conformable with 1-23 α -(1- α ) 2/3 =2 MD′c bρr 2 0 t .This paper introduces the fundamental theoretical and laboratory studies which shows the possibility for extracting potassium from polyhalite underground by leaching.

杂卤石中含丰富的钾资源 ,由于其化学上的难溶性和埋藏较深 ,尚未合理开发利用 .已有研究表明 ,杂卤石矿层具备溶浸开采的地质基本条件 .矿石中钾的溶解是杂卤石资源合理利用的技术关键 .利用CaCl2 水溶液为溶剂 ,通过测定溶浸液中钾、钙离子的浓度 ,考察了溶浸剂浓度、矿石粒度、温度对杂卤石表观溶解动力学过程的影响 .实验条件下 ,矿石中钾的溶解率随粒度的降低明显升高 .矿石粒度在 0 1 4 9~ 1mm之间 ,钾的溶解率可达 80 %以上 .该溶解反应为一级反应 (对CaCl2 而言 ) .计算实验条件下溶浸过程表观动力学速率常数 ,得溶解反应表观活化能为 8 34kJ·mol-1 ,实验结果初步表明杂卤石溶解过程受内扩散控制 ,溶解动力学方程符合未反应核收缩模型 ,实验结论对地浸法提取钾具有理论参考意义

The hydrate formation from ice is considered as a gas-solid reaction process and the process is consisted of external diffusion of gas reactant and internal diffusion of the product layer as well as interfacial reaction between hydrate and ice. On the basis of analyzing the control step for ice conversing to hydrate and introducing the sign function, the unreacted core shrinking model for hydrate formation was proposed. The solving method of the model was submitted. The results coincide with the experimental...

The hydrate formation from ice is considered as a gas-solid reaction process and the process is consisted of external diffusion of gas reactant and internal diffusion of the product layer as well as interfacial reaction between hydrate and ice. On the basis of analyzing the control step for ice conversing to hydrate and introducing the sign function, the unreacted core shrinking model for hydrate formation was proposed. The solving method of the model was submitted. The results coincide with the experimental records well.

冰转化为水合物是一个有产物层生成的气固反应过程,整个反应过程由气体反应物的外扩散、产物层内扩散以及在冰和水合物界面发生的化学反应组成。在对冰转化为水合物控制步骤分析的基础上,引入符号函数并提出一个改进的未反应核收缩模型来描述冰转化为水合物的动力学。给出了该模型的数值求解方法,求解结果与文献数据相吻合。

 
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