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摘要硝酸铵有三种不同的结晶方式，重结晶，蒸发结晶，熔融结晶.本实验采取了先溶解硝酸铵，然后旋转蒸发，蒸发后的溶液先自然冷却，然后放入冰箱冷却结晶，产生不同结晶，有细长针状结晶，有网状结晶等.然后将结晶提纯的硝酸铵放入烘箱烘干备用.去一定量的纯硝酸铵和不同比例的乌洛托品混合，然后加入一定量的水，搅拌溶解后放入烘箱加热结晶，将烘干的产品研磨成粉末，过40目筛.将产品装袋放入保干器保存.将不同比例的混合物在压片机上压片，将片状混合物测其硬度和崩解度.分别取2g不同比例的混合物，将其放入称量瓶中，将称量瓶放入保干器中，每2h测其重量，通过重量的变化测其吸湿率.最后测不同混合物的DTA和TG曲线.混合物中乌洛托品的含量为2%时的吸湿率为8.210%，在含量为5%时达到最大为11.38%，之后吸湿率减小.从DTA图中看出样品出现了三个熔融峰，峰一平均出现在124℃左右，峰二平均出现在160℃左右,峰三平均出现在210℃左右.随着乌洛托品的含量提高，样品分解率先提高后降低，在样品四即乌洛托品含量为5%是达到最大为99.9993%，这与吸湿实验结果相吻合. 关键词 硝酸铵 乌洛托品 热分解9166
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毕业设计说明书（论文）外文摘要
Title Thermal Decomposition of methenamine / ammonium nitrate mixture
Abstract
There are three different crystalline ammonium nitrate, recrystallization, evaporation and crystallization, melt crystallization. This experiment took first dissolved ammonium nitrate, and then rotary evaporator, the evaporation of the solution after the first natural cooling, and then into the refrigerator cooling crystallization, resulting in different crystalline, a slender needle crystal mesh crystalline Then purified by the crystallization of ammonium nitrate into the oven drying standby Take a certain amount of pure ammonium nitrate and different proportions of methenamine mixed, then add a certain amount of water, stir dissolved into the oven heating crystallization, the dried product was ground into powder, 40 mesh sieve. Will save the product into the desiccator. Mixtures of different proportions of the tablet press, tablet, flake mixture to measure the hardness and disintegration2 g of a mixture of different proportions were taken, put it into a weighing bottle, weighing bottles placed in a desiccator, its weight is measured every two hours, its absorption rate measured by weight change. Finally measured the DTA and TG curves of different mixtures.
Methenamine content of the mixture of 2% when the moisture absorption rate of 8.210%, maximum of 11.38% in the content of 5% after the moisture absorption rate decreases seen samples of three melting peak from the DTA diagrampeak an average at about 124 ℃, the average peak two at about 160 ℃, the peak three average at about 210 ℃. sample decomposition the lead in raising as Urotropine content increased and then decreased in the sample, namely blackThe loto product content of 5% is to reach a maximum of 99.9993%, which is consistent with the results of absorption experiments.
Keywords Ammonium nitrate methenamine thermal decomposition
目录
1前言1
2绪论1
2.1硝酸铵1
2.2 乌洛托品3
2.3 硝酸铵混合物的分解6
3实验7
3.1实验设备 7
3.2实验试剂7
3.3工业品硝酸铵的精制7
3.4乌洛托品/硝酸铵混合物的制备9
3.5测硬度和崩解度9
3.6测吸湿率10
3.7测热分解曲线12
4结论20
4.1乌洛托品/硝酸铵混合物的制备条件20