双嘧达莫中间体合成新工艺研究

文章以2,4,6,8-四氯嘧啶并[5,4-D]嘧啶、哌啶为原料,在甲苯中,以碳酸钠和氢氧化钠为催化剂,缩合生成2,6-二氯-4,8-二哌啶子基嘧啶并[5,4-D]嘧啶,收率可达90％以上,无需精制,纯度可达99％以上,该工艺路线可行,操作安全简便,三废少,适合工业化生产.     

Fire＇s effect on chloride ingress related durability of concrete structure

This paper describes the effects of fire on durability of reinforced concrete structures, and points out that fire not only damages the chemical composition and physical structure of concrete by high temperature, but also leads to an additional risk due to the generation ofpolyvinyl chloride （PVC） combustion gases. A mathematical model is proposed to calculate chloride ingress profiles in fire damaged concrete, so as to explore the service life prediction of the structure. Rapid Chloride Migration （RCM） test was carried out to determine the chloride diffusion coefficients for the application of the mathematical model. Finally, the detected results of a reported case testified to the validity of the mathematical model.     

不能用加氯化物来鉴别Na2CO3和NaHCO3

1问题的提出 高中化学中常要求学生鉴别碳酸钠和碳酸氢钠、对于上述两种溶液的鉴别方法是分别向两溶液中滴加氯化钡溶液或氯化钙溶液,如果产生白色沉淀,则所鉴别溶液为碳酸钠溶液,反之则为碳酸氢钠溶液.然而,实际操体时却发现两种溶液中均产生白色沉淀.     

稀土La、Ce氯化物的冠醚固体配合物的合成与表征

以无水乙腈为溶剂，合成1稀土La、ce氯化物与4’碘-5’一硝基苯并-15-冠-5的固体配合物，进行7元素分析、红外光谱、紫外光谱及摩尔电导的测定，结果表明配合物的组成为1：2型电解质。     

倍受青睐的高效漂白剂——ClO_2

ClO2消毒效率是同质量Cl2的2．63倍,不会与水中的有机物反应生成对人体有害的氯化物,被世界环保联盟确认为安全、高效、广谱、强力杀菌剂．ClO2在高考化学中同样受到广泛关注和青睐．解答有关ClO2试题,只要我们具备下列有关ClO2的知识,就可迎刃而解．     

四元体系CuCl2-LaCl3-(13.07%)HCl-H2O(298K)的相平衡研究

测定了四元体系CuCl2-LaCl3-(13．07％)HCl-H2O在298K时的溶度，绘制了相应的溶度图。溶度曲线由两支组成，该体系在298K为简单共饱型。     

两点电位滴定法测定天然水氯化物

作者根据文献[3、4]中冯俊贤等人提出的确定电位滴定终点的方法,用于天然水氯化物的电位滴定.实验证明,方法简便快速,优于传统电位滴定法.     

Separation of the Ternary System of Methanol/ Methyl Butyl Ether/1-Butylchloride

The separation of ternary methanol/methyl butyl ether/1-butylchloride mixtures was investigated, which are the main components of the waste liquid. After preliminary studies on the ternary system, the integrated process of extraction and distillation was put forward to separate the ternary system. The results show that methanol carl be removed from the mixtures by extraction using water as the extracting agent. Through distillation of extract and dried raffinate respectively, methanol, methyl butyl ether and 1-butylchloride can be separated and recovered. In addition, the optimal volume for the extracting agent and effects of reflux ratio on the yield of product were also studied. The optimal volume ratio of the extracting agent to material is 1： 3.5, and the yield of the product increases with the increase of reflux ratio.     

低盐饮食并非越低越好

食盐有“百味之母”之美称,不仅是日常饮食不可缺少的调味品,也是维持人体正常发育不可缺少的物质。食盐的主要成分是氯化钠,其中59％是钠,61％是氯化物。食盐在人体内可分解成钠离子和氯离子,分别发挥着不同的作用。     

瑞士高性能电池助力昭和“e-VAN”电动汽车提高驱动力

昭和飞机工业即将上市的电动汽车“eVAN”配备的充电电池使用的是瑞士MESDEA公司生产的钠镍氯化物充电电池，这种电池在欧美被称为“Zebrabattery”，现已配备于近3000辆电动汽车上。