关键词: 丙烯, 选择氧化, 两段流化床反应器, 丙烯醛, 丙烯酸

Abstract: The experimental results on production of acrylic acid from catalytic partial oxidation of propylene using a single-stage fluidized bed (SSFB) reactor and a two-stage fluidized bed (TSFB) reactor were presented. Experimental investigation for the first-step reaction was conducted on variation of propylene conversion rate and liquid product yield with operating parameters, such as temperature, propylene space velocity, and ratio of oxygen to propylene. The results indicate that the propylene conversion rate and liquid yield in the first-step reaction can be greatly improved up to 94.2% and 74.4% respectively in a two-stage fluidized bed reactor due to effectively suppressing gas backmixing and growth of bubbles in the catalyst bed. Meantime, this work also presented the optimal conditions of space velocity of propylene 20~21 L/(h·kg), operating temperature 360~365℃ and molar ratio range of oxygen to propylene 1.6~1.8 in the first-step process. Moreover, the propylene conversion rate and liquid yields in the first-step and two-step process in the acrylic acid production were also examined under the optimal operating conditions.

Key words: propylene, selective oxidation, two-stage fluidized bed reactor, acrolein, acrylic acid