表面改性的活性炭在合成乙二醇反应中的应用研究

【作者】 蔡兴娅；

【导师】 林青松；

【作者基本信息】 大连理工大学 ， 应用化学， 2000， 硕士

【摘要】 本论文首次在环氧乙烷水合反应中，引入表面改性的活性炭作为多相催化剂，并对经磺化改性的石油焦活性炭在反应中的催化性能进行了系统的研究。 结果表明，磺化石油焦活性炭对环氧乙烷水合反应有很高的活性和乙二醇选择性。其活性大小依次为：25℃磺化的石油焦活性炭≈50℃磺化的石油焦活性炭＞100℃磺化的石油焦活性炭＞150℃磺化的石油焦活性炭＞200℃磺化的石油焦活性炭＞230℃磺化的石油焦活性炭，因此磺化温度对石油焦活性炭的活性有一定的影响，低温磺化比高温磺化的效果好；并且随着磺化温度的上升，石油焦活性炭的酸中心数逐渐增多，而活性却逐渐减弱，说明环氧乙烷水合反应只适于弱酸催化；反应温度对石油焦活性炭的性能影响最大，随着反应温度的升高，催化剂活性是快速增强的，但超过一定温度范围后，活性还有所减弱；石油焦活性炭的活性还随反应压力的增大而加强，压力超过一定值时，乙二醇的选择性会降低；空速的增加也会引起石油焦活性炭的活性减弱。 实验中也对木质活性炭进行了考查，发现其对环氧乙烷水合反应也有很好的活性，有待进一步的研究。更多还原

【Abstract】 Applied Study on the Superficial Transformation of Active Carbon in the Hydration of Ethylene Oxide to Ethylene Glycol ABSTRACT In this paper , the superficial transformation of active carbon , the sulfonated petroleum coke is firstly used to synthesize ethylene glycol (EG) by hydration of ethylene oxide (EO) , and the catalysis of sulfonated petroleum coke (SPC) is studied. The results indicate that SPE has high activity and good selectivity of EG in hydration reaction of EO . And sulfonation temperature has a certain effect on the activity of SPC , the higher the temperature , the feebler the activity , thus when petroleum coke is sulfonated in low temperature , its activity will be better than in high temperature ; Moreover, alone with the sulfonation temperature ascending , the number of acid-site of SPC gradually increase , but the activity wears off, it also shows that weak acid catalyst is more sutible for hydration reaction of EO ; In addition, the effect of reactive temperature on the activity of SPC is greatest, when reactive temperature going up , the activity of SPC is speedily enhanced , but when temperature exceeds a certain range, the activity of SPC will reduce ; And the activity of SPC will become stronger alone with reactive pressure rising , but when pressure exceeds a certain value , selectivity of EG will decrease Also , increasing airspeed will weaken the activity of SPC. Abstract At the same time , through investigating the catalysis of woodiness active carbon , the results show that it also has good activity in the hydration reaction of EO to EG , but that awaits for further studying.更多还原