| In this paper, phosphine ligand {P[C6H5-O(CH2CH2O)nH]3}was used in therrnoregulatedPEG biphasic system. Hydroformylation of 1-octene, cyclohexene, diisobutylene catalyzed byRh/PETPP complex was investigated. Under the optimized conditions of T=120℃,P(CO:H2=1:1)=5.0MPa, t=4h, P/Rh=3(molar ratio), S/C=2000(molar ratio), the conversion of1-octene and the yield of alydehyde were100％and TOF was 500h-1. The Rh/PETPP complexcatalyst could be reused for 20 times without obvious loss in activity. The loss of Rh analyzedby ICP-AES for the first three times was 0.98％, 0.69％and 0.02％(wt％) respectively. Underthe conditions of T=120℃, P(CO:H2=1:1)=5.0MPa, t=4h, P/Rh=3(molar ratio),S/C=3000(molar ratio), the hydroformylation of cyclohexene catalyzed by Rh/PETPPcomplex was studied. The conversion of cyclohexene and yield of aldehyde were 100％andTOF was 750h-1. The catalyst could be recycled for 6 times and the loss of Rh analyzed byICP-AES for the first three times was 1.23％, 0.87％, 0.34％(wt％) respectively. In addition,hydroformylation of diisobutylene was examined. Under the conditions of T=130℃,P(CO:H2=1:1)=5.0MPa, t=10h, P/Rh=3(molar ratio), S/C=1000(molar ratio), the conversionof diisobutylene and yield of aldehyde were 100％and TOF was 100h-1. The loss of Rh forthe first three times was 0.68％, 0.02％(wt％), not detected, respectively. Compared with ourprerious results, using PETPP ligand in the thermoregulated PEG biphase catalytic system,the loss of Rh decrease evidently.
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