Aromatic isocyanates was synthesized by Curtius rearrangement reaction. The effects of phase transfer catalysis, the mole ratio of reactant and reaction temperature on the yield of product have been studied. The optimum condition has been determined by the method of orthogonal design. 采用Curtius重排反应,由芳酰氯和叠氮化钠合成芳香异氰酸酯的方法,分别研究了相转移催化剂、反应物料配比及反应温度对芳香异氰酸酯产率的影响,并由正交设计法确定最佳合成条件。
We found that the mole ratio of the raw materials, gelling temperature, carbonization temperature and etching method could effect the pore structure of the porous carbons. 研究发现,影响多孔炭孔结构的主要因素是原料的摩尔比,另外还与胶凝温度、炭化温度、刻蚀方式有关。
The kinds and amount of solid base, the mole ratio of reactants, and grinding time were investigated. The yield of the solid state grinding method is higher ( more than 90%) compared with the traditional method. 考察了碱的用量及种类、物料摩尔比、研磨时间对产率的影响,并和经典方法作了对比,固相研磨法产率较高(90%以上)。
From the definition of cycle multiple ratio, mathematics model of cycle multiple ratio in circulating fluidized bed boiler is established using mole ratio of calcium and sulfur 、 separator efficiency η and ash balance method. 该文从循环倍率的定义出发,利用钙硫摩尔比Ca/S、分离器效率η和灰平衡方法,建立了循环流化床锅炉循环倍率的数学模型,由此可以方便地确定循环物料量。
The determination method of Pb/ Ti mole ratio in high-pure and superfine lead titanate powder was studied. Pb and Ti in lead titanate sample are determined use EDTA titration method respective. 介绍了高纯超细钛酸铅电子陶瓷粉体材料中铅/钛摩尔比的快速测定方法,样品中的铅、钛利用EDTA滴定法快速测定。