摘要
以有机钼醇化合物为催化剂 ,叔丁醇为溶剂 ,研究了过氧化氢异丙苯 ( CHP)氧化丙烯制环氧丙烷 ( PO)的反应 ,考察了反应条件对氧化性能的影响。结果表明 ,每毫升催化剂含酸量低于1 50 mg KOH的催化剂性能基本相同。合成的催化剂具有较强的酸性 ,可分解过氧化氢异丙苯 ,在反应混合物中加入碱性物质 ,可阻止过氧化氢异丙苯的分解。溶剂对丙烯环氧化性能有较大的影响。以钼 /1 ,2 -丙二醇化合物为催化剂 ,叔丁醇为溶剂 ,反应温度 95°C～ 1 0 5°C,时间 2 h～ 4h,压力0 .5MPa～ 0 .7MPa,过氧化氢异丙苯的转化率为 34.2 % ,环氧丙烷的选择性为 64.
Epoxidation of propylene with cumene hydroperoxide as an oxidant has been studied, in which Molybdenum/glycol complex catalyst and tert butyl alcohol solvent were used. The effects of reaction conditions on the epoxidation of propylene have been investigated. The results show that molybdenum/glycol complex catalysts containing acidity lower than 150mg KOH/mL cat are approximately equal in the catalytic property. The catalysts synthesized have the strong acidity decomposing cumene hydroperoxide to phenyl hydroxide and acetone. The decomposition of cumene hydroperoxide can be restrained by adding the basic substrate Na 2CO 3. For the epoxidation of propylene, there is a solvent influence and tert butyl alcohol or ethanol used as the solvent is better than others. Under the reaction conditions of 95°C ～ 105°C , time 2h～4h, pressure of propylene 0.5MPa～0.7MPa, the conversion of cumene hydroperoxide is 34.2%, the selectivity to propylene oxide is 64%. The epoxidation step involves no change in oxidation state Mo(VI). Acidity of molybdenum/glycol complex plays an important role in epoxidation of propylene as epoxidation catalyst.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2001年第3期289-293,共5页
Journal of East China University of Science and Technology
