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本文应用原位红外光谱技术,在接近于工业反应条件下(H_2:CO=1:1.1.0MPa.80℃),在四种溶剂(异丁醛、2—乙基已醇、甲苯和环已烷)中考察了铑膦配合物催化剂Rh(acac)(CO)(PPh_3)的烯烃醛化反应.检测到在四种溶剂中的主要中间配合物均为HRh(CO)_2(PPh_3)_2,但在2—乙基己醇溶剂中的烯烃醛化反应速度高于异丁醛、甲苯和环已烷溶剂(约1.2～1.3倍).结果表明,采用2—乙基已醇溶剂替代醛类做反应溶剂,有可能提高工业反应装置的生产能力.
In this paper, in situ IR spectroscopy was used in the presence of four solvents (isobutyraldehyde, 2-ethylhexanol, toluene and cyclohexane) under near-industrial reaction conditions (H 2: CO = 1: 1.1.0 MPa.80 ℃) Alkane), the aldehyde hydroformylation of rhodium-phosphine complex catalyst Rh (acac) (CO) (PPh_3) was investigated.The main intermediate complexes in all four solvents were identified as HRh (CO) _2 (PPh_3) However, the rate of aldehyde hydroformylation in 2-ethylhexanol was higher than that of isobutyraldehyde, toluene and cyclohexane (about 1.2-1.3 times) .The results showed that the aldehydes were replaced by 2-ethylhexanol solvent As a reaction solvent, it is possible to increase the productivity of industrial reaction equipment.