微波催化法合成4-硝基二苯乙烯系列化合物

在K2CO3固体碱、PEG-400相转移催化剂催化下,利用微波辐射,合成了6个4-硝基二苯乙烯系列化合物.     

Recovery of Dilute Acetic Acid by Catalytic Distillation Using NKC-9 as Catalyst

The reaction kinetics of dilute acetic acid with methanol using NKC-9 as catalyst was studied at temperatures of 308 K, 318 K, 323 K, 328 K. The kinetic model based on Langmuir-Hinshel-wood rate model was derived and the activation energy was 6.13×104 kJ/kmol. The experiment of recovery of dilute acetic acid was conducted in a packed bed catalytic distillation column. The optimal process parameters and operational conditions determined to make up to 85.9% conversion of acetic acid are as follows:the height of catalyst bed is 1 100 mm, reflux ratio is 4:1, and the ratio of methanol to acetic acid is 2:1. The method can be used as a guide in industrial scale recovery of 15%-30% dilute acetic acid.     

建筑涂料用纯丙乳液的研制

采用甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)为软硬单体组分，加入少量的自交联单体α-甲基丙烯酸(α-M从)，利用核壳乳液聚合方法制备了一种高固含量的纯丙乳液。讨论了软硬单体的配比、乳化剂种类、各种乳化剂间的配比、引发剂用量等对乳液性能及外观的影响。     

有机化学对比教学方法的探索与实践

研究、探讨了有机化学教学中的对比教学法,并经多年教学实践证明,本方法在提高教学质量方面有良好的效果。     

Science Letters:Differentiation of xanthomonads causing the bacterial leaf spot of poinsettia in China from the pathotype strain of Xanthomonas axonopodis pv. Poinsettiicola

In October 2003, a new bacterial disease with symptoms similar to those caused by Xanthomonas axonopodis pv.poinsettiicola was observed on poinsettia leaves at a flower nursery in Zhejiang Province of China. Three Xanthomonas strains were isolated from infected plants and classified as X. axonopodis. They were differentiated from the pathotype strain LMG849 of X. axonopodis pv. poinsettiicola causing bacterial leaf spot of poinsettia by comparison of pathogenicity, substrate utilization and BOX-PCR genomic fingerprints.     

催化动力学光度法测定痕量钯

本文发现了在磷酸——磷酸=氢钾缓冲溶液（pH=2.0）中,痕量钯（Ⅱ）催化次磷酸钠还原亚甲基蓝褪色为指示反应,建立了痕量钯的动力学光度分析新方法,方法的最低检测限为4.92×10~(-8)g/ml,方法应用于模拟试样的测定,结果满意。     

4,4′-二偶氮苯重氮氨基苯与镍的显色反应

在OP -40表面活性剂存在下 ,研究了 4,4!@ -二偶氮苯重氮氨基苯 (BABAB)与镍的显色反应。在 pH =9.0 -1 0 .5的Na2 B4 O7-NaOH缓冲溶液中 ,该试剂与镍生成 2∶1型深红色配合物。配合物的最大吸收峰位于λ =5 40nm处 ,表观摩尔吸光系数达 1 .5 9× 1 0 5L·mol- 1·cm- 1。Ni2 +的浓度在 0～ 1 0 μg/2 5mL范围内符合比耳定律     

电子转移反应理论及其进展

电子转移反应是近年来自然科学中十分活跃的研究领域,是化学研究的前沿课题之一。本文讨论(1)Marcus理论大意:(2)Marcus理论对倒置区域的预测;(3)电子转移理论的进展。     

利用荷移光谱法测定可待因片剂的含量

本文研究了可待因与 7,7,8,8-四氰基对二次甲基苯醌 (TCNQ)的荷移反应 ,对反应条件进行了优化 .在丙酮介质中 ,二者在室温 (30℃ )中 30min即可形成 1:1荷移络合物 .分别在74 3和 84 0nm处有较强光吸收 .可待因浓度在 0 .6～ 7(g·mL-1范围内符合比尔定律 ,其表观摩尔吸光系数在 2 .3× 10 4～ 5 .1× 10 4;方法的相对标准偏差为 1.8%～ 2 .4 % (n =9) .