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KOH/Naβ催化剂上丙醇与碳酸二甲酯合成碳酸二丙酯
引用本文:李永昕,马清祥,陈兴权.KOH/Naβ催化剂上丙醇与碳酸二甲酯合成碳酸二丙酯[J].石油化工,2005,34(9):827-830.
作者姓名:李永昕  马清祥  陈兴权
作者单位:宁夏大学,天然气转化自治区重点实验室,宁夏,银川,750021
基金项目:国家重大基础研究前期研究项目基金资助项目(2003CCA03200)
摘    要:用丙醇和碳酸二甲酯(DMC)液相酯交换合成碳酸二丙酯(DPC),筛选出催化性能和稳定性较好的KOH/Naβ固体碱催化剂,考察了KOH负载量对催化剂酯交换性能的影响。实验结果表明,KOH负载量(以K的质量分数计)为12%时,催化剂对酯交换反应的催化性能最好,在丙醇与DMC摩尔比4∶1、催化剂和反应物的质量比0.04、反应温度90℃、反应时间6h的条件下,DMC的转化率和DPC的选择性分别达到95.5%和93.6%。CO2-程序升温脱附表征结果表明,催化剂上的弱碱中心是催化剂的活性中心,且碱量越大,催化剂的催化性能越好。

关 键 词:丙醇  碳酸二甲酯  碳酸二丙酯  氢氧化钾  分子筛  催化剂  酯交换
文章编号:1000-8144(2005)09-0827-04
修稿时间:2005年3月23日

Synthesis of Dipropyl Carbonate from Dimethyl Carbonate and Propyl Alcohol on KOH/Naβ Catalyst
LI Yongxin,Ma Qingxiang,CHEN Xingquan.Synthesis of Dipropyl Carbonate from Dimethyl Carbonate and Propyl Alcohol on KOH/Naβ Catalyst[J].Petrochemical Technology,2005,34(9):827-830.
Authors:LI Yongxin  Ma Qingxiang  CHEN Xingquan
Abstract:Synthesis of dipropyl carbonate(DPC)from dimethyl carbonate(DMC)and propyl alcohol by transesterification was studied.A series of supported solid base catalysts were prepared and their catalytic activities were evaluated by transesterification.KOH/Naβ molecular sieve was the most effective among the tested catalysts.Effects of KOH loadings on catalyst activity were investigated and KOH loading(mass fraction of K)of 12% was the highest in activity.Under optimal conditions:n(propyl alcohol) ∶n(DMC)=4 ∶1,(m(catalyst)) ∶m(reactant)=0.04,90℃,6h,DMC conversion and DPC selectivity were 95.5% and(93.6%) respectively.Catalysts were characterized by CO_2 temperature-programmed desorption(CO_2-TPD).Weak basic sites were active sites for the transesterification.The catalyst activity was direct proportional to the amount of weak basic sites on catalyst.
Keywords:propyl alcohol  dimethyl carbonate  dipropyl carbonate  potassium hydroxide  molecular sieve  catalyst  transesterification
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