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。
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.
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