二氧化锰

P-Bromobenzaldehyde was synthesized from p-bromotoluene by direct oxidation with manganese sesquioxide The factors affecting the yields of p-bromobenzaldehyde were investigated.

用三氧化二锰直接氧化法将对溴甲苯氧化对溴苯甲醛，讨论了合成过程中影响产率的各种因素，确定反应的优化条件为温度338K，硫酸的浓度7.5mol/L，三氧化二锰1.8g，产率可达73.89%。

P - bromobenzaldehyde was prepared from p - bromotoluene by manganese sesquioxide oxidation.

本文用三氧化二锰作为氧化剂，以对溴甲苯为原料，在不同条件下进行反应合成对溴苯甲醛，探讨了酸度、温度、三氧化二锰用量等因素对对溴苯甲醛产率的影响。

In chapter three, various theories and experience on the dispersion of nano-powders proposed by former researchers were generalized and reviewed. Technical standards and experimental process for determining technological parameters were suggested for the dispersion of nano-scaled metal oxides in aqueous medium according to their surface wettability, surface charge, the dependence of surface charge on pH and the compatibility of surfactants with pH and pH adjusting agents. Based on these suggested standards and experimental method, highly stable and dispersive aqueous suspensoid of nm-ZnO, nm-TiO〓, nm-Co〓O〓 and nm-MnO powders were prepared successfully and surface modification on these nano-powders was also achieved.

本文第三章通过大量的文献调研，归纳总结了前人在纳米粒子分散技术方面的理论和经验，并在此基础上根据纳米氧化物粉体的表面润湿性、表面电性及其与分散介质pH值的关系、表面活性剂及其与pH调节剂的配伍关系设计了纳米氧化物水分散体系的工艺规范以及确定工艺参数的通用实验步骤，成功地制备了纳米氧化锌、纳米二氧化钛、纳米氧化钴和纳米氧化锰的高稳定分散悬浮液并实现了干粉体的表面改性，为纳米材料在氧化锌压敏电阻中的应用创造了第二个前提条件。

On the condition of using fatty acids of rapeseed oil as raw material,85% acetic acid as solvent, pelargonic acid as recrystalization solvent, this paper prepared azelaic acid and brassylic acid by ozonolysis ,oxidation decomposition ,recrystallization etc.

以蓖麻油酸为原料、85%醋酸水溶液为溶剂，经臭氧化、氧化分解、沸水萃取等过程制备壬二酸的最佳反应条件为：m：m(85%醋酸)=1：4，臭氧化温度20-25℃；氧化分解温度90-95℃，催化剂醋酸锰/醋酸铜用量为原料蓖麻油酸质量的0.09%，氧化分解4h，壬二酸的收率为62.5%。

Deferrizers and demaganizers are series of products designed by our company for underground water with comparatively high iron and managanese content according to aerating oxidation priciple.in these prducts,packed natural manganese sand in filter is applied as filtering materials,and oxygen in air is applied as oxidants,to make ferrous iron in water oxidized into ferric iron, in a same time, oxidation reaction makes its produced its produced substances left in filtering materials for purposes of deferrization and deman-ganization.

除铁锰装置是我公司针对铁、锰较高的地下水，按曝气氧化法的原理而设计的系列产品，它是利用过滤器内装填城然锰砂为滤料，利用空气中的氧化剂，使水中的二价铁，同时发生氧化反应使其物进截留在滤料中，从而达到除，除锰的目的。

The optimum conditions were obtained as follows: the weight ratio of fatty acids and 85%acetic acid is 1:4, ozonolysis temperature is 20-25℃, manganese/copper acetate as catalyst, and the amount of catalyst is 0.15% of fatty acids, oxidation decomposition temperature and oxidation decomposition time are 90-95℃ and 4 hours respectively. the yields of azelaic acid and pelargonic acid are 57.4% and 51.6% respectively.

以菜油酸为原料、85%醋酸水溶液为溶剂，经臭氧化、氧化分解、重结晶等过程制备壬二酸和十三烷二酸的最佳反应条件为：m：m(85%醋酸)=1：4，臭氧化温度20-25℃；氧化分解温度80-85℃，催化剂醋酸锰/醋酸铜用量为原料菜油酸质量的0.12%，氧化分解时间3h，重结晶溶剂壬酸的用量为5倍质量的氧化分解产物时，十三烷二酸的收率为58.3%，壬二酸的收率为57.2%。

Factors were reviewed, and optimum conditions was obtained,these experiments provide effective data for industrial manufacture.On the condition of using fatty acids of cottonseed oil as raw material,85% acetic acid as solvent,this paper prepared azelaic acid and pelargonic acid by ozonolysis, oxidation decomposition , extracted by boiling water,active carbon absorpting etc.

以棉油酸为原料、85%醋酸水溶液为溶剂，经臭氧化、氧化分解、沸水萃取、活性炭吸附脱色等过程制备壬二酸的最佳反应条件为：m：m(85%醋酸)=1：4，臭氧化温度20-25℃；氧化分解温度90-95℃，催化剂醋酸锰/醋酸铜用量为原料棉油酸质量的0.15%，氧化分解4h，壬二酸收率为57.4%，壬酸收率为51.6%。

The current research status of metal oxides is described in detail, including titanium dioxides, manganese oxides iron oxides, cobalt oxides, copper oxides, zinc oxides, other metal oxides with single element and multiple elements metal oxides, along with the results obtained in our groups.

结合本课题组的研究成果，按照二氧化钦、锰氧化物、铁氧化物、钴氧化物、氧化铜、氧化锌、其他单一金属氧化物和多组分掺杂金属氧化物等顺序对其催化臭氧机理进行了阐述，并对今后催化臭氧的研究与应用进行了展望。

With the development of electronics technologies,lithium ion secondary battery using lithium manganese oxide as cathode would be widely used.

随电子技术的发展，以氧化锰锂为正极的锂离子二次电池将得到广泛的应用。

In this paper,the latest progress on lithium manganese oxide as cathode materials of lithium Ion secondary battery was reviewed.

综述了最近几年对于锂离子二次电池正极材料氧化锰锂的研究。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。