河北化工
河北化工
하북화공
HEBEI CHEMICAL ENGINEERING AND INDUSTRY
2011年
12期
32-34
,共3页
低聚合度多聚甲醛%微波催化%碘量法
低聚閤度多聚甲醛%微波催化%碘量法
저취합도다취갑철%미파최화%전량법
low polymerization degree paraformaldehyde%microwave catalyzation%iodimetry
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。
採用微波催化法閤成低聚閤度多聚甲醛,攷察瞭不同的微波功率、催化時間等因素對多聚甲醛收率、多聚甲醛中甲醛含量以及多聚甲醛平均聚閤度的影響。用亞硫痠鈉法和碘量法分彆對工業多聚甲醛就行聚閤度的測定。實驗結果錶明,微波可以顯著加快聚閤反應以及脫水反應的速率。實驗結果錶明,選擇微波功率為300 W、物料溫度為50℃、反應時間為25 min、二乙胺質量分數為0.05%時,測得多聚甲醛中甲醛的質量分數達到97.28%,多聚甲醛的平均聚閤度〈22。採用碘量法測定聚閤度誤差較小。
채용미파최화법합성저취합도다취갑철,고찰료불동적미파공솔、최화시간등인소대다취갑철수솔、다취갑철중갑철함량이급다취갑철평균취합도적영향。용아류산납법화전량법분별대공업다취갑철취행취합도적측정。실험결과표명,미파가이현저가쾌취합반응이급탈수반응적속솔。실험결과표명,선택미파공솔위300 W、물료온도위50℃、반응시간위25 min、이을알질량분수위0.05%시,측득다취갑철중갑철적질량분수체도97.28%,다취갑철적평균취합도〈22。채용전량법측정취합도오차교소。
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.
