连续水热氧化苯酚生产小分子有机酸

Continuous hydrothermal oxidation of phenol for small molecule organic acids production

摘要:

以甲酸和乙酸为目标产物，利用自研发的连续水热反应装置开展了苯酚水热氧化资源化试验研究。结果表明，加入碱显著地促进了甲酸和乙酸的生成，但过量的碱降低了甲酸和乙酸的产率；甲酸和乙酸产率均随反应温度、供氧率、反应时间均先增加后减少; 在温度300 ℃、NaOH浓度1.0 mol•L-1、供氧率70%、反应时间为60s时甲酸和乙酸产率分别达到最高值9.5%和11.2%。基于产物识别，探讨了小分子有机酸特别是甲酸和乙酸的生成路径。

Abstract:

With formic and acetic acids as the main objective products, the experimental research hydrothermal oxidation of phenol for producing small molecule organic acids was conducted by using a self-developed continuous-flow hydrothermal reaction apparatus. The results show that the addition of alkali promotes formic and acetic production but excess alkali decreases formic and acetic acids yields. Formic and acetic acids yields increase first and then decrease with the increasing in the oxygen supply, reaction time and temperature. The highest yields of up to 9.5% and 11.2% for formic and acetic acids, respectively, are obtained at the temperature of 300 oC with the concentration of 1.0 mol•L-1 NaOH and oxygen supply of 70% for 60 s. Based on the products recognization, production pathways of the small molecule organic acids, especially formic and acetic acids, are discussed.