丙烯催化氧化制丙烯酸的两段流化床工艺

分别在一段和两段流化床反应器中对丙烯催化氧化制备丙烯酸过程进行了研究. 主要考察了温度、丙烯空速和氧/烯比等操作条件对丙烯氧化制备丙烯醛的第一步反应中丙烯转化率和液相收率的影响. 结果表明，在两段流化床反应器中，由于能够有效抑制气体和固体的返混及催化剂床层中气泡的增长，第一步反应中丙烯转化率和液相收率可以分别大幅度提高到94.2%和74.4%. 得到第一步反应的优化条件为：丙烯空速20~21 L/(h·kg)，操作温度360~365℃，氧/烯摩尔比1.6~1.8，在此条件下，考察了连续两步反应中的丙烯转化率和液相收率.

Production of Acrylic Acid via Catalytic Partial Oxidation of Propylene in a Two-stage Fluidized Bed

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.