两相催化体系中混合C_8烯烃氢甲酰化反应条件影响的研究

EFFECT OF THE REACTION CONDITIONS ON THE HYDROFORMYLATION OF MIXED OCTENES(2,4,4-TRIMETHYL-1-PENTENE AND 2,4,4-TRIMETHYL-2-PENTENE) IN BIPHASIC CATALYTIC SYSTEM

鉴于混合C8 烯烃水溶性差 ,在pH =2± 0 .2时考察了反应温度、膦 /铑比、CO/H2 分压比、混合气总压等因素对水溶性铑 /膦配合物Rh(CO) (TPPTS) 2 催化剂催化混合C8烯烃氢甲酰化反应活性的影响 ,并综合材质价格、异辛烯的转化率和选择性等多方面的因素 ,选定最佳反应条件为 :反应时间 5h ,反应温度 1 0 5～ 1 2 0℃ ,反应总压 5MPa ,其中CO/H2 =2 /3。该反应条件下成醛转化率达 5 4% ,选择性为 96 %。

In view of the difficulty on mass transfer of mixed octenes in aqueous/organic biphasic system, the experiment keeps the system in the state of acidity(pH=2±0.2). The hydroformylation of mixed octenes (mainly contain 2,4,4-trimethyl-1-pentene and 2,4,4-trimethyl-2-pentene) has been carried out in biphasic catalytic system. The experimental results showed that the optimum reaction condition: temperature zone 105-120℃,total pressure 5.0MPa, the ratio of CO/H 2 2/3,/ molar ratio 16～20, the volume ratio of mixed octenes/water 1/2. The conversion of octenes to iso-C 9 aldehydes was up to about 54% under the optimum reaction condition, namely, the reaction has acceptable conversion and high selectivity (96%).