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。
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 CO2 temperature - programmed desorption （ CO2 - 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.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2005年第9期827-830,共4页
Petrochemical Technology
基金
国家重大基础研究前期研究项目基金资助项目(2003CCA03200)
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
propyl alcohol
dimethyl carbonate
dipropyl carbonate
potassium hydroxide
molecular sieve
catalyst
transestefification
