微波辅助合成硼酸钙  

Microwave-assisted synthesis of calcium borate

作　　者：刘霞[1] 张丽芳[1] 李建辉[1] 

机构地区：[1]北京石油化工学院化工系,北京102617

出　　处：《无机盐工业》2011年第5期33-35,45,共4页Inorganic Chemicals Industry

摘　　要：采用硼酸、氢氧化钙为原料,利用微波加热方式合成硼酸钙(xCaO·yB2O3·nH2O),以缩短反应时间、提高反应效率。实验中考察了反应温度、微波辐射时间、原料比等因素的影响;确定了合成硼酸钙(CaO·2B2O3·2H2O)的适宜反应条件:反应温度为95～105℃、微波辐射时间为40 min、氢氧化钙与水物质的量比为1∶39.6、氢氧化钙与硼酸物质的量比为1∶4.5,在此条件下产品收率达88%。产品的组成分析结果基本符合要求,CaO·2B2O3·2H2O的粒径约为10μm,失水温度为190℃,微波加热条件下的反应速率约是常规加热法反应速率的4倍。Microwave heating method was adopted to synthesize calcium borate（xCaO·yB2O3·nH2O） so as to shorten reaction time and increase reaction efficiency when using boric acid and calcium hydroxide as raw materials.Effects of reaction factors,such as reaction temperature,microwave irradiation time,and mix ratio of raw materials,were investigated in the experiment.Suitable reaction conditions for synthesis of calcium borate（CaO·2B2O3·2H2O） were determined as follows：reaction temperature was 95～105 ℃,time of microwave irradiation was 40 min,amount of substance ratio-of-calcium hydroxide to water was 1：39.6,amount-of-substance ratio of calcium hydroxide to boric acid was 1：4.5.Under those conditions,the product＇s yield reached 88%,the composition analysis of product was up to the standard,its diameter was about 10 μm and its dehydration temperature was 190 ℃.Reaction was 4 times faster under microwave irradiation than that under conventional heating.

关 键 词：氢氧化钙 硼酸钙 微波辐射 

分 类 号：TQ132.32[化学工程—无机化工]