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以环烷酸镍(Ni)和三异丁基铝(Al)为均相加氢催化剂,环己烷为溶剂,研究了丁二烯和苯乙烯三嵌段共聚物(SBS)的加氢动力学。结果表明,加氩速率与氢气压力的一次方成正比,与双键浓度无关;当Al/Ni=3(摩尔比),Ni浓度在2.5～7.5 mg/g SBS时,加氢速率达到最大值;利用Arrhenius关系求得恒压与变压下的表观加氢反应活化能分别为47.6 kJ/mol和35.8 kJ/mol。对加氢产物微观结构分析所得总加氢度为102.8％,表明该体系加氢效率高,选择性好。
Hydrogenation kinetics of butadiene and styrene triblock copolymer (SBS) was studied using nickel naphthenate (Ni) and triisobutylaluminum (Al) as homogeneous hydrogenation catalysts and cyclohexane as solvent learn. The results show that the rate of argon addition is directly proportional to the pressure of hydrogen and has nothing to do with the concentration of double bonds. The hydrogenation rate reaches the maximum when Al / Ni = 3 (mole ratio) and Ni concentration is 2.5-7.5 mg / g SBS The activation energies of apparent hydrogenation at constant pressure and pressure were 47.6 kJ / mol and 35.8 kJ / mol, respectively, using the Arrhenius relationship. The total hydrogenation degree of the hydrogenation product microstructure analysis was 102.8%, indicating that the system has high hydrogenation efficiency and good selectivity.