搜索结果: 76-90 共查到“化学反应工程其他学科”相关记录240条 . 查询时间(5.127 秒)
填充床电极反应器中典型有机电合成反应系统的选择性分析
机电合成反应系统 填充床电极反应器
2009/6/8
典型的有机电合成反应，常伴有相互竞争的电极副反应和均相反应，增加电极极化以提高反应速率会使选择性明显降低。填充床电极具有大的内表面，能在相对低的极化下，达到较高的表观电流密度，有利于缓解反应速率和选择性之间的突出矛盾。本文对填充床电极微分反应器（PBEDR）中典型有机电合成反应过程进行了理论分析，重点在于床层内超电势横向分布对选择性的影响。建立了描述超电势分布的普遍化数学模型，归纳出表征电极极化和...
乙醇-水混合溶剂中5′-尿苷酸二钠的结晶介稳区
溶解度 介稳区 λh方程
2009/6/5
采用双光路激光法，在293.2～318.2 K温度范围内，研究了5′-尿苷酸二钠在不同比例乙醇-水混合溶剂中的溶解与超溶解特性，得到了5′-尿苷酸二钠的结晶介稳区。采用λh方程关联了4个体系的溶解度数据，进而分别求得各体系下的混合焓和结晶焓。同时，探讨了搅拌转速、pH值和钠离子浓度对结晶介稳区的影响。实验结果表明，与温度相比较，乙醇质量分数是影响溶解度和超溶解度的主要因素;随乙醇质量分数的增大...
LEWIS H. SARETT WAS the first chemist to synthesize cortisone. It was a feat of remarkable complexity involving nearly 40 chemical steps from desoxycholic acid and was achieved during World War II as ...
[bupy]BF4-AlCl3离子液体上甲苯和间戊二烯的烷基化反应
甲苯 BF4-AlCl3离子液体
2009/4/28
The alkylation of toluene with 1,3-pentadiene to produce pentyltoluene was carried out to obtain 2,6-dimethylnaphalene, which is an important intermediate during the production of 2,6-naphthalene dica...
To check the applicabilities of the simple density equation and viscosity equation in the semi-ideal solution theory to nonelectrolyte solutions, the densities and viscosities were measured for the qu...
Experimental densities, viscosities and heat capacities at different temperatures were presented over the entire mole fraction range for the binary mixture of 1,2-propanediol and water. Density valu...
强制不稳态环状反应器网络的特性
化学反应器 甲醇 反应工程学
2009/4/28
The multi-reactors network, a closed sequence of two or more catalytic fixed bed reactors with periodical change of the feed position, was studied by means of numerical simulations. Two advantages of ...
A GE/Equation of State Mixing Rule for Vapor-Liquid Equilibria
vapor-liquid equilibria equation of state mixing rule
2009/4/28
A new excess Gibbs free energy/equation of state type mixing 0rule was derived by removing the infinite pressure boundary condition imposed by Wong and Sandler. The mixing rule was extensively tested ...
Semi-batch crystallization of 7-amino-desacetoxycephalosporanic acid (7-ADCA) is a complicated pro-cess, in which agglomeration occurs together with nucleation and crystal growth. To systematically ...
L-Lactic acid fermentation in a rotating-disc contactor with simultaneous product separation by ion-exchange
L-Lactic acid rotating-disk contactor D354 resin
2009/4/28
L-Lactic acid fermentation in a rotating-disc contactor with simultaneous product
separation by ion-exchange.
Kinetics of Photocatalytic Degradation of Methylene Blue overTiO2 Particles in Aqueous Suspensions
kinetics photocatalytic titaniaminipage
2009/4/28
The kinetics of photodegradation of methylene blue over UV lightilluminated titania particles in aqueous suspensions has been studied withdifferent initial methylene blue concentrations and TiO2 parti...
Modeling of the Relationship Between Pore Size Distribution and Thickness of Ceramic MF Membrane
modeling pore structure pore size distribution thickness
2009/4/7
The pore size distribution (PSD) measured by the gas bubble point (GBP) method of ceramic microfiltration (MF) membranes prepared by suspension technique was found to be significantly influenced by t...
Molecular Weight Distribution of Polystyrene Produced in a Starved Feed Reactor
starved feed reactor molecular weight distribution styrene
2009/3/30
A starved feed reactor (SFR) is a semi-batch polymerization reactor where initiator and monomer are fed slowlyinto a fixed amount of solvent. The polymerization is carried out isothermally at elevat...