苯甲酸制备实验回收二氧化锰及含量测定  

Determination of Recovery of Manganese Dioxide from the Preparation of Benzoic Acid

作　　者：张秀丽[1] Zhang Xiuli(School of Science,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质大学数理学院,北京100083

出　　处：《广东化工》2022年第6期191-191,共1页Guangdong Chemical Industry

摘　　要：在有机化学实验苯甲酸的制备实验中,用甲苯作原料,用高锰酸钾作氧化剂,把苯甲酸氧化成苯甲酸钾,加入的高锰酸钾是过量的,需要用亚硫酸钠除去,减压过滤,得到苯甲酸钾溶液,再用盐酸酸化,制得白色苯甲酸固体。减压过滤后的滤渣是高锰酸钾和亚硫酸钠反应后生成的碱式氧化锰,煅烧碱式氧化锰可制得二氧化锰。用氧化还原滴定测得二氧化锰含量。并用在大学化学实验—化学反应速率和活化能的测定实验中做过氧化氢分解的催化剂,效果好。这样可节约试剂又不污染环境。Preparation of benzoic acid in organic chemistry experiment, Using toluene as raw material, Using potassium permanganate as oxidant, Oxidating of benzoic acid into potassium benzoate. The potassium permanganate is excessive and needs to be removed with sodium sulfite, And then vacuum filtered to obtain potassium benzoate solution, The benzoic acid solid was prepared by acidizing hydrochloric acid, The filter residue after vacuum filtration is alkali manganese oxide produced by reaction of potassium permanganate and sodium sulfite. Manganese dioxide from calcined manganese oxide. The content of manganese dioxide was measured by redox titration. The catalyst was used in the experiment of university chemistry-the determination of chemical reaction rate and activation energy, Good effect. This saves reagents without polluting the environment.

关 键 词：苯甲酸 二氧化锰 含量测定 过氧化氢 催化剂 

分 类 号：TQ[化学工程]