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选择性最大
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  maximum selectivity
     When the dynamic functions with pure raw material in constant condition and temperature are known in the three dimensional concentration space,the CSTR and DSR conjectures equations are separately linked with limits of selectivity,relative selectivity and maximum selectivity and their intersections are the judgement of maximum selectivity of reactor system.
     在定态、恒温、纯原料进料, 反应动力学方程已知的条件下, 导出了三维状态空间全混流反应器(CSTR) 和微分侧流反应(DSR) 轨迹方程, 并指出这两种迹线方程分别对应于选择性、相对选择性和瞬时选择性的极值点,其交点是反应器系统选择性最大的判据。
短句来源
     Then the optimum reactor composition and the reaction way with maximum selectivity are developed in an arbitrary reactor system.
     从而得出任意反应体系的选择性最大的最优反应器组合和反应途径
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  “选择性最大”译为未确定词的双语例句
     The general problem of optimal activity distribution aimed at maximizing the selectivity of isothermal catalyst pellets was analysed and solved analytically for parallel-consecutive reaction net- work with arbitrary kinetic function f_1(C_A)and f_3(C_A),and positive-exponential type kinetic function f_2(C_B).
     文章针对如下反应网络■用解析法研究了等温的催化剂颗粒中以选择性最大为目标的活性分布优化问题。 式中,f_1(C_A)、f_3(C_A)为任意动力学函数,而 f_2(C_B)为正幂式。
短句来源
     The experimental results indicate that,when feed-in flux is 300 mL/min and CH_4/H_2 is 2∶8,the rate of methane conversion,acetylene selectivity and ethylene selectivity reach maximum 91.3%,81.7% and 11.1% respectively. The deposition speed of carbon black is small,only 1.47 mg/min.
     实验结果表明,当原料气总流量为300 mL/m in,CH4/H2为2∶8时,甲烷转化率、乙炔选择性和乙烯选择性最大,分别为91.3%、81.7%和11.1%,此时积炭速度小,仅为1.47 mg/m in。
短句来源
     Firstly, the experiment have been done to select the active component of the catalysts for 1,4-naphthoquinone by air-catalytic oxidation from naphthalene.
     K_2SO_4和K_2S_2PO_7的混合比率在2:1时,催化剂的活性和选择性最大
短句来源
     It was found that selectivity may be maximized by concentrating the active components in a specific zone either for flat,cylindrical or spherical pellets,It means that the optimal activity dis- tribution is a Dirac δ-function.
     分析表明,欲使 B 的选择性最大,应把活性物集中在粒内某特定位置的薄层中,即最优活性分布为 Dirac δ—函数。
短句来源
     The results show that higher temperature is favorable for POM process and the optimum CH_4/O_2 mole ratio for CO selectivity and CH_4 conversion is 2. Ce and La are better promoters than Ca for the catalytic performance.
     当CH4/O2为2时,CO的选择性最大; 助剂Ce和La对催化剂的性能改善较好;
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  相似匹配句对
     The Maximum Alternative-Flow
     并流
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     The Biggest Animal of All
     的动物
短句来源
     It was found that the effect of pH on the selectivity and the current efficiency is the largest.
     结果发现 ,p H对产物选择性和电流效率的影响 .
短句来源
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  maximum selectivity
The cells of the strain BA-11 exhibited maximum selectivity in the determination of the compounds.
      
In either case, at points of maximum selectivity of ECH processes, the ratio cAcOH/cini = n+ 1, where nis the number of hydrogenated bonds.
      
Maximum selectivity is observed in the solid state and not in the liquid-crystalline state as is the case with thick films.
      
With the non-ideal model, the projection of eluents and their contribution to the inertia explained by the factorial axes can define a new experimental domain where maximum selectivity is obtained.
      
The maximum selectivity and sensitivity for measurements of these elements was obtained by combining ion-exchange, extraction and precipitation methods with use of an NaI(Tl) detector.
      
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The general problem of optimal activity distribution aimed at maximizing the selectivity of isothermal catalyst pellets was analysed and solved analytically for parallel-consecutive reaction net- work with arbitrary kinetic function f_1(C_A)and f_3(C_A),and positive-exponential type kinetic function f_2(C_B).It was found that selectivity may be maximized by concentrating the active components in a specific zone either for flat,cylindrical or spherical pellets,It means that the optimal activity dis- tribution...

The general problem of optimal activity distribution aimed at maximizing the selectivity of isothermal catalyst pellets was analysed and solved analytically for parallel-consecutive reaction net- work with arbitrary kinetic function f_1(C_A)and f_3(C_A),and positive-exponential type kinetic function f_2(C_B).It was found that selectivity may be maximized by concentrating the active components in a specific zone either for flat,cylindrical or spherical pellets,It means that the optimal activity dis- tribution is a Dirac δ-function.The optimun location of the active zone,ξ_(opt),can be expressed ana- lytically in terms of a single dimensionless unmber μ_(opt),which contains all the pertinent physico- chemical parameters.

文章针对如下反应网络■用解析法研究了等温的催化剂颗粒中以选择性最大为目标的活性分布优化问题。式中,f_1(C_A)、f_3(C_A)为任意动力学函数,而 f_2(C_B)为正幂式。分析表明,欲使 B 的选择性最大,应把活性物集中在粒内某特定位置的薄层中,即最优活性分布为 Dirac δ—函数。该薄层在粒内的最佳位置ξ_(OPt)取决于有关的物化参数,可通过一个无因次数μ_(opt)用简单的代数表达式进行计算。

Reactions of dilute ethylene converting to isobutylene and gasoline over ZSM-5 zeolitewere investigated. Aiming at the selectivity of isobutylene and/or gasoline product, the reaction parameters were chosen. The mechanism of ethylene polymerization and aromatization over ZSM-5 was proposed.The maximum isobutylene selectivity and the highest gasoline yield appeared at a reaction temperature of300℃ and 350C respectively. Hydrogen transfer reaction was present in the course of aromatization, anddehydrogenation...

Reactions of dilute ethylene converting to isobutylene and gasoline over ZSM-5 zeolitewere investigated. Aiming at the selectivity of isobutylene and/or gasoline product, the reaction parameters were chosen. The mechanism of ethylene polymerization and aromatization over ZSM-5 was proposed.The maximum isobutylene selectivity and the highest gasoline yield appeared at a reaction temperature of300℃ and 350C respectively. Hydrogen transfer reaction was present in the course of aromatization, anddehydrogenation reaction as well.

考察了稀乙烯在ZSM-5佛石上的转化反应,提出了以汽油或异丁烯为目的产物时的反应参数;同时对乙烯在ZSM-5沸石上叠合、芳构化反应的机理进行了探讨。结果表明:反应温度为300℃时,以异丁烯为主的C4烯烃选择性最大;反应温度为350℃时,汽油产率最大。在芳构化过程中既有氢转移反应,又有直接脱氢生成芳烃的反应。

Optimal activity distribution to selectivity in nonisothermal Porous heterogeneous catalyst for series reaction networks were derived by using mathematical method. The results howed that the optimal distribution function for selectivity is δ-function. Meanwhile,theeffect of optimal positlon on selectivity and multistability were discussed.

讨论了一维多孔性催化剂颗粒在非等温情况下活性组分的最佳分布。活性组分集中在离颗粒中心某一距离的无限薄层上可得到最大的选择性S_(max).该最佳位置决定于非等温效应、传质阻力以及反应速率的相对大小.文中针对连串反应体系,运用数学方法证明了颗粒催化剂活性组分非均匀分布时的最大反应选择性。结果表明,当分布函数为δ-dirac时,连串反应的选择性最大,并讨论了活性组分位置对选择性的影响和体系的多重态.

 
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