摘要
超临界CO2中一釜法合成碳酸二甲酯(DMC),对于CO2的资源化利用和绿色化学品合成都具有重要的意义.本实验以CO2、环氧丙烷(PO)和甲醇为原料,甲醇钾(CH3OK)为催化剂,无水氯化钙为脱水剂,研究物料配比(VCH3OH∶VPO=1~1 2)、搅拌速度(0~500 r·min-1)、压力(5.0~10 MPa)、温度(110~190℃)和时间(0.25 ~3 h)对一釜法合成DMC的影响,并提出了超临界CO2中以CH3OK为催化剂一釜法合成DMC可能存在的反应机理.结果表明,在最佳反应条件(VCH3OH∶ VPO=10∶1、搅拌速度为300 r·min-1、反应压力为7.0 MPa、反应温度为140℃)下,反应1h后甲醇转化率为22.0%,DMC收率达到45.5%.
The synthesis of dimethyl carbonate(DMC) in supercritical carbon dioxide is important for resourcization of carbon dioxide and green synthesis. The synthesis of DMC were studied with carbon dioxide, propylene oxide(PO), and methanol as raw material, potassium methoxide (CH3OK) as catalyst, calcium chloride(CaC12) as dehydration agent. The effects of factors such as the ratio of VCHaOH: Vpo(1-12), stirring speed (0-500 r-min-X), pressure (5.0-10.0 MPa), temperature (110~190℃) and reaction time (0.25-3.0 h) on the synthesis of DMC were investigated. In addition, a possible reaction mechanism of one-pot synthesis of dimethyl carbonate on CHaOK was proposed. The results show that the conversion of methanol and the yield of DMC could reach 22.0% and 45.5% respectively under optimized reaction conditions (VCH3OH: VPO=10:1, stirring speed 300 r.min-1, pressure 7.0 MPa, temperature 140℃, reaction time 1 h).
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2014年第6期1334-1339,共6页
Journal of Chemical Engineering of Chinese Universities
基金
浙江省自然科学基金(Y5110158)
浙江省教育厅项目(Y200805324)
关键词
超临界
CO2
甲醇
环氧丙烷
碳酸二甲酯
supercritical
carbon dioxide
methanol
propylene oxide
dimethyl carbonate