低聚合度多聚甲醛的微波催化合成及其聚合度的测定  

Synthesis and Determination of Low Polymerization Degree Paraformaldehyde Using Microwave Catalyzation

作　　者：陆小东[1] 吴阿娜[2] 

机构地区：[1]南通职业大学化学工程系,江苏南通226007 [2]南通江山农药化工股份有限公司,江苏南通226003

出　　处：《河北化工》2011年第12期32-34,共3页Hebei Chemical Industry

摘　　要：采用微波催化法合成低聚合度多聚甲醛,考察了不同的微波功率、催化时间等因素对多聚甲醛收率、多聚甲醛中甲醛含量以及多聚甲醛平均聚合度的影响。用亚硫酸钠法和碘量法分别对工业多聚甲醛就行聚合度的测定。实验结果表明,微波可以显著加快聚合反应以及脱水反应的速率。实验结果表明,选择微波功率为300 W、物料温度为50℃、反应时间为25 min、二乙胺质量分数为0.05%时,测得多聚甲醛中甲醛的质量分数达到97.28%,多聚甲醛的平均聚合度<22。采用碘量法测定聚合度误差较小。Synthesis of low polymerization degree paraformaldehyde under microwave irradiation was studied.Effects of microwave irradiation power,time and promoter on yield of paraformaldehyde were investigated.The polymerization degree of industrial paraformaldehyde was determined by sodium sulfite method and iodimetry,the merits and demerits of two methods were compared.Microwave irradiation remarkably accelerated reaction and shortened reaction time.Formaldehyde content in paraformaldehyde and yield of paraformaldehyde reached 97.28% and 74.67% respectively.The average polymerization degree of paraformaldehyde was below 22 under microwave power 300 W,material superficial temperature was 50 °C,reaction time was 25 min and mass fraction of dim ethylamine was 0.04%.Iodimetry measuring error was smaller.

关 键 词：低聚合度多聚甲醛 微波催化 碘量法 

分 类 号：TQ326.51[化学工程—合成树脂塑料工业]