Catalytic system composed by Rh(acac)(CO)2and the bisphosphite ligand was used as homo-geneous catalyst for hydroformylation of isobutene to improve reactivity and selectivity.The effects of reac-tion temperature,pressure,solvents,organic alkali and catalyst circulations in the system on the reaction were investigated.The results reveals isovaleraldehyde is a good solvent and the optimal ligand is bis-(2, 4-di-tert-butylphenyl) pentaerythritol diphosphite combined with triphenylphosphine oxide.Under the best reaction conditions of [Rh]1.55×10 -3mol/L,110 ℃,2.0 MPa and 6 h,the conversion of isobutene is 96.82% with the selectivity 99.75%,the attenuation is very small for apply 4 times.The catalytic system shows good activity,selectivity and circulations for hydroformylation of isobutene.%以Rh(acac)(CO)2/双亚磷酸酯体系为催化剂,提高异丁烯氢甲酰化反应的活性和选择性.在此基础上考察了温度、压力、溶剂、有机碱、催化剂套用等参数对异丁烯氢甲酰化反应的影响.结果表明,以Rh(acac)(CO)2/双(2,4-二叔丁基苯基)季戊四醇二亚磷酸酯为催化体系,铑的溶液浓度为1.55×10 -3mol/L,异戊醛为溶剂,三苯基氧膦为有机碱,在110 ℃下2 MPa的合成气下反应6 h,异丁烯的转化率高达96.82%,选择性为99.75%,套用4次衰减很小.该催化剂体系显著提高了异丁烯氢甲酰化反应的活性和选择性,且具有良好的套用性能.
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