查询词典 reaction rate

In order to surmount the problem of slow reaction rate of the Baylis-Hillman reaction, we employed N-tosylated imines as the electronphile.

因为醛和环状烯酮的反应很难进行，我们便用活性更高的亲电试剂磺酰亚胺代替醛进行Baylis-Hillman反应，取得了很好的结果，反应速度得到了很大的提高。

To replace the ionization constant of benzoic acid and esterification rate constant, and many others between the kinetic parameters can be observed that the same relationship that substituent effect in a reaction and another reaction to a certain degree of correlation between.

在取代的苯甲酸的电离常数和酯化速率常数以及其他许多有关的动力学参数之间，可观察到同样的关系，即取代基效应在一个反应和另一个反应之间有一定的关联性。

The experimental results show that the vanadium removal rate can reach more than 97% under the conditions of wastewater pH 2.5,iron filing dosage 12.5%,ambient reaction temperature,reaction time 90 min.

试验结果表明，在废水 pH为2 。5、铁屑用量为 12 。5 %、常温、反应时间为 90min的条件下，钒的去除率可达 97%以上。

The interfacial chemistry, synergistic effects and interfacial kinetics of thesynergistic extraction system D_2EHPA-MPA-Fe~(3+) have been studied, where MPA is amono-alkyl phosphate extraction with long carbon chain. D_2EHPA in the mixed extractionsystem strongly exhibits the effect on the thermodynamics of micella formation and interfaceproperties of MPA. Some thermodynamic parameters of micella formation were obtained.The interfacial adsorption behaviour of D_2EHPA is opposite to that of MPA. Theemulsification for single MPA and the mixed system was discussed. The synergistic effectswere found in this mixed extraction system. It is proved that the process of Fe~(3+) extractionfor non-mixed extraction system is controlled by chemical reaction, the controlling reactionoccurs at the interface, and the reaction rate equation is obtained.

本文研究了协同萃取体系D_2EHPA—MPA—Fe~(3+的胶团形成热力学、界面特性、协萃效应和界面动力学(动力学控制机制和反应速率方程)研究发现，混合萃取体系中的D_2EHPA强烈地影响MPA的胶团形成热力学和界面吸附行为，得到了胶团生成常数、胶团形成自由能和临界胶团浓度的热力学参数D_2EHPA和MPA具有相反的界面吸附行为研究发现D_2EHPA—MPA混合萃取剂体系对Fe~(3+)产生了协萃效应动力学和界面化学的研究结果还证实了非胶束混合萃取体系的Fe~(3+)的萃取过程是受化学反应控制的，控制反应发生在界面上

In the chapter 2, the Claisen-Schmidt reaction was carried out in glass microfluidic chips with two Y-shaped inlets. The effect of interfacial area on the rate of phase transfer reaction was studied and discussed.

第二章首次在玻璃流流控芯片中进行了Claisen-Schmidt缩合反应的研究，讨论了两相间的接触面积对反应速率和转化率的影响。

The results indicated that reaction of HCN oxidation to NO finished in milliseconds, and radicals were important reactants or resultants of main elemental reactions during oxidation of HCN. Concentration of radicals had important effect on rate and extent of reaction.

计算结果表明，HCN氧化生成燃料型NO的反应在毫秒级时间内完成，占控制地位的基元反应都涉及到自由基，自由基的浓度决定反应的速率和进行程度。

With change of calcium sulfate shape and reduce of compact degree of coat layer on phosphate rock, the velocity of second stage reaction of SSP is accelerated by active addition agent, and with intensification of mass transfer, the rate of first stage reaction of SSP is promoted by ultrasonic.

活化添加剂促进酸矿反应的重要途径是改变硫酸钙结晶的晶习，减弱硫酸钙对磷矿包裹的致密程度，特别表现为对第二阶段的反应十分有利，而超声波对酸矿反应的促进主要表现为提高第一阶段反应的传质过程强度。

The result will provide afundamental basis for industrial design.Firstly,based on the assumptions that the reaction generating mono-ester was controlled by the solution rate of pentaerythritol,that di-ester conversed to tri-ester rapidly and that all the reverse reactions and side reactions were omitted,the equations of reaction kinetics were obtained.

具体工作如下：(1)基于生成一酯的反应受季戊四醇溶解速率控制、二酯迅速转化为三酯和忽略所有逆反应及其它副反应的假设基础上，建立了酯交换反应的反应动力学方程，获得了不同温度下的动力学常数和速率常数的指前因子及活化能。

The rate constant k ,the activation energy.and induction period of the transestetifieation reaction for the PET/PEN reactive blend were obtained using a kinetic expression based on a second-order reversible reaction mechanism.

根据酯交换反应程度和不同反应温度下的诱导期探讨了酯交换反应与相容性的关系，认为PET与PEN的相容导致或增强了酯交换反应，即相容性是酯交换的必要条件；同时酯交换的发生又促进了PET与PEN的相容。

The results of FT-IR 1H-NMR indicate the structure of polyester, and the 13C-NMR analysis of three quaternary carbon showed the existing of hyperbranched struscture, MALDI-TOF MS showed the hyperbranched polyester structure, the degree of branching of the polyesters determined by 13C-NMR being 0.408. The esterification reaction kinetics followed a second-order equation and the reaction rate was controled by the concemtration of carboxyl group and hydroxyl group,-d/dt=K.

以IR、1H-NMR证实了聚酯结构的存在，13C-NMR谱图上3种季碳的特征峰有力证实了超支化分子结构的存在，MALDI-TOF MS证明了超支化聚酯的成功合成，并计算超支化聚酯的支化度为0.408；探讨并建立了超支化聚酯的缩聚反应动力学方程－d/dt=K，该缩聚反应属于二级反应，反应速率由羟基浓度和羟基浓度共同决定。

I was up all night because I was in pain, she said.

我整夜，因为我在疼痛，她说。

A crow caws /craoks.

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