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摘要
The catalytic effects of polyethylene glycol(PEG) on epoxidation of epoxidized soybean oil(ESO) was investigated.Based on single factor experiments,response surface optimization method was used to determine the optimal conditions for epoxidation.It was found that low molecular weight PEG can accelerate and promote the epoxidation reaction.The high epoxy value (>6.00 %),low acid value(<0.40 mg/g) and high yield (>85 %) of soybean oil epoxidation were achieved when the amount of polyethylene glycol was 2~6 mL.In addition,PEG 200's catalytic effect was better than the other.The response surface optimization results showed ∶ m (SBO)∶m(H2O2)=1.15∶ 1,m(SBO) ∶ m(catalyst)=34.5 ∶ 1,m(SBO) ∶ m(PEG200)=3.30∶ 1,heated for 3.5 h in 60 ℃ water bath.Under these conditions,the epoxy value was 6.37 % which was close to the predicted value of 6.32 %.It can be determined that the parameters of soybean oil epoxidation by the response surface optimization of process was reliable,and the optimization results could offer practical values for ESO's industrialized production.
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