Abstract:

The effects of four different stabilizers (2,4-di-tert-butylphenol, triethanolamine, dilauryl thiodipropionate and copper stearate) on the thermal stability of deteriorative sulfolane were investigated. At the conditions of sulfolane 100 g, N2 flow rate of 95 mL/min，240 ℃ and reaction time of 2 h, the thermal stabilities of deteriorative sulfolane were evaluated based on the release amount of SO2. The results show that the descending order of the influence of the additives on the thermal stability of deteriorative sulfolane is: 2,4-di-tert-butylphenol > triethanolamine > dilauryl thiodipropionate > copper stearate. When 2,4-di-tert-butylphenol dosage is 0.12% of deteriorative sulfolane, the release amount of SO2 is 331.04 mg, indicating the best effect for inhibiting thermal decomposition of sulfolane. A relationship between 2,4-di-tert-butylphenol dosage and the release amount of SO2 was established using SPSS software, which can be used for predicting the effect of the additive dosage on the thermal decomposition of sulfolane in the experimental range.

Key words: deteriorative sulfolane, additive, thermal decomposition, thermal stability, SPSS software