催化反应工程华东理工大学第五章2环氧乙烷合成反应器课件

二环氧乙烷合成反应器

1环氧乙烷反应体系特性

(1)(2)(3)在银催化剂上，乙烯（简称ET）氧化除得到产物环氧乙烷（简称EO）外，主要副产物是二氧化碳和水。反应（1）为选择氧化反应，反应（2）为深度氧化反应。选反应（1）和反应（2）为独立反应，C2H4和CO2为关键组分。管壳型反应器整理上式，得：床层的压力降初值条件已知条件反应器内径8.034m反应管φ45×3.5mm高度8m管数15431根入口压力1.89MPa入口温度178℃沸腾水压力2.4252MPa温度223℃反应器入口气量818845Nm3/h反应器入口气体组成组分C2H4O2EOCO2H2OCH4ArN2C2H6摩尔分率0.300.080.00010.050.0050.50860.05270.00140.0022计算结果体积/m3140.0入口温度/℃178热点温度/℃231.9出口温度/℃230.2yout/%C2H427.90EO1.97CO25.91产量/t.d-1750.2选择性/%82.03ΔP/MPa0.189反应器模型－二维非均相固相方程反应器模型－二维非均相边界条件其中，将上述数学模型无因次化，无因次准数为反应器模型－二维非均相反应器模型－二维非均相固相方程（无因次化）反应器模型－二维非均相边界条件（无因次化）模型参数的计算公式径向弥散混合系数计算公式：流－固相传质系数计算公式：模型的数值求解（1）预测公式（2）校正公式1模型的数值求解（2）校正公式2模型的数值求解预测和校正方程消去的点。件，消去的点。则可用代替，从而离散为新的预测和校正差分方程，代入用一阶中心差分离散的边界条（4）边界条件的处理模型的数值求解原方程中项为不定项，根据L’Hospital法边界条件用一阶中心差分离散，再分别用上述计算框图求解固相浓度和温度方程操作条件：T0,T,Vsp,进口气体组成。轴径向分段数N,M求解气相浓度和温度校正公式求解气相浓度和温度预测公式j>N结束打印该截面气固相浓度和温度分布k=0j=0k=0k=1j=j+0.5k=1j=j+0.5k=0否是计算实例上海石化总厂化工厂采用的氧气法环氧乙烷合成路线，属于美国SD公司技术。环氧乙烷设计生产能力为12万吨/年核心设备反应器是立式列管固定床反应器，壳体走蒸汽，反应的原料气走管内。反应器特性和操作条件见下表进口原料气组成（mol-%）ET25.06O27.8EO0.01H2O0.31CH462.1CO24.72空时产率188.85gEO·Lcat-1·h-1选择率81.7%初期催化剂活性校正因子：0.8077

0.5685续表环氧乙烷合成反应器特性和操作条件模型预测值与工业实际值的比较出口气体组成（mol-%）预测值实际值ET22.5622.65O25.225.32EO2.292.21H2O1.331.45CH462.8162.60CO25.795.77出口气体温度（℃）228.5228.6空时产率gEO·Lcat-1·h-1188.851188.856选择率（％）81.781.7计算结果－固相外表面温度分布ξz0.0000.1670.3330.5000.6670.8331.0000.00.10.20.30.40.50.60.70.80.91.0206.00227.64232.81233.28233.11232.74232.37232.05231.75231.48231.23210.29227.19230.19231.33231.15230.89230.63230.40230.19230.00229.82207.68227.48232.13232.65232.41232.08231.75231.45231.19230.94230.72212.01227.04230.35230.72230.56230.34230.11229.91229.72229.55229.39212.30227.02230.33230.70230.54230.30230.07229.86229.67229.50229.34216.42226.59228.73228.98228.88228.74228.60228.47228.32228.24228.13219.92226.21227.54227.69227.64227.55227.46227.38227.30227.24227.17计算结果－气相乙烯浓度分布ξz0.0000.1670.3330.5000.6670.8331.0000.00.10.20.30.40.50.60.70.80.91.0.25060.24835.24539.24243.23961.23695.23444.23205.22979.22764.22558.25060.24835.24539.24243.23961.23695.23444.23205.22979.22764.22558.25060.24835.24539.24243.23961.23695.23444.23205.22979.22764.22558.25060.24835.24539.24243.23961.23695.23444.23205.22979.22764.22558.25060.24835.24539.24243.23961.23695.23444.23205.22979.22764.22558.25060.24835.24539.24243.23961.23695.23444.23205.22979.22764.22558.25060.24835.24539.24243.23961.23695.23444.23205.22979.22764.22558计算结果－固相外表面乙烯浓度分布ξz0.0000.1670.3330.5000.6670.8331.0000.00.10.20.30.40.50.60.70.80.91.0.25030.24798.24493.24198.23919.23656.23407.23171.22947.22733.22529.25023.24799.24499.24204.23925.23661.23412.23175.22950.22736.25532.25027.24798.24495.24200.23921.23658.23409.23172.22948.22734.22530.25021.24799.24501.24206.23926.23662.23413.23176.22951.22737.22533.25020.24799.24501.24206.23927.23663.23413.23176.22951.22737.22533.25013.24801.24506.24211.23921.23667.23416.23179.22954.22740.22536.25006.24802.24509.24214.23934.23669.23419.23182.22956.22742.22537计算结果－气相二氧化碳浓度分布ξz0.0000.1670.3330.5000.6670.8331.0000.00.10.20.30.40.50.60.70.80.91.0.04720.04802.04922.05047.05167.05282.05392.05498.05600.05699.05794.04720.04802.04922.05047.05167.05282.05392.05498.05600.05699.05794.04720.04802.04922.05047.05167.05282.05392.05498.05600.05699.05794.04720.04802.04922.05047.05167.05282.05392.05498.05600.05699.05794.04720.04802.04922.05047.05167.05282.05392.05498.05600.05699.05794.04720.04802.04922.05047.05167.05282.05392.05498.05600.05699.05794.04720.04802.04922.05047.05167.05282.05392.05498.05600.05699.05794计算结果－固相外表面CO2浓度分布ξz0.0000.1670.3330.5000.6670.8331.0000.00.10.20.30.40.50.60.70.80.91.0.04729.04816.04942.05066.05185.05299.05409.05514.05615.05713.05807.04731.04816.04938.05063.05182.05296.05406.05511.05613.05711.05806.04729.04816.04940.05065.05184.05298.05408.05513.05614.05712.05807.04732.04815.04937.05061.05181.05296.05405.05511