对苯二甲酸-丁二醇催化单酯化反应动力学(英文)

The chemical kinetics of the monoesterification between terephthalic acid (TPA) and 1,4-butanediol (BDO) catalyzed by a metallo-organic compound was studied using the initial rate method. The experiments were carried out in the temperature range of 463-483 K, and butylhydroxyoxo-stannane (BuSnOOH) and tetrabutyl titanate [Ti(OBu)4] were used as catalyst respectively. The initial rates of the reaction catalyzed by BuSnOOH or Ti(OBu)4 were measured at a series of initial concentrations of BDO (or TPA) with the concentration of TPA (or BDO) kept constant. The reaction orders of reagents were determined by the initial rate method. The results indicate that the reaction order for TPA is related with the species of catalyst and it is 2 and 0.7 for BuSnOOH and Ti(OBu)4 respectively. However, the order for BDO is the same 0.9 for the two catalysts. Furthermore, the effects of temperature and catalyst concentration are investigated, and the activation energies and the reaction rate constants for the two catalysts were deter-mined.     

循环流化床锅炉运行浅见

CFB锅炉是近年才发展起来的新型洁净煤燃烧技术。从高坝电厂和国内其它CFB锅炉的运行过程中，发现了一些故障和缺陷。结合自身的运行和调试经验，对故障原因作出了分析，提出了解决措施，为CFB锅炉的运行和CFB锅炉的大型化设计提供借鉴和参考。     

深水槽城市河道生态型改造策略探析

通过对沙澧河现状分析,将城市所承载的工作、居住与休闲功能进行有效耦合,综合提炼出五大开发策略,有效指导了生态型城市河道的规划研究、城市设计和实施措施的制定。     

高校校园景观二次规划研究

以石河子大学北、中、南校区校园景观规划为例,本着绿色大学校园的实质与内涵,对石河子大学校园景观规划提出了节约型和可持续发展的建设方向,并对高校校园景观规划进行了探讨,以期营造一个良好的校园环境。     

对苯二甲酸和1,4丁二醇的单酯化催化动力学

文章主要是研究了对苯二甲酸和1,4丁二醇的单酯化反应动力学。该酯化的反应级数是通过初始速率法测得的。该反应应用的催化剂是丁基锡酸和钛酸四丁酯。实验结果显示对苯二甲酸的反应级数是根据催化剂的不同而在2到0.7之间变化的。反应活化能和速率常数也分别被测得。