低温液相甲醇合成鼓泡浆态反应器数学模拟

MATHEMATICAL MODELING OF LOW-TEMPERATURE LIQUID PHASE METHANOL SYNTHESIS PROCESS IN A BUBBLE SLURRY REACTOR

建立了经由甲酸甲酯的低温液相甲醇合成鼓泡浆态反应器的数学模型 ,模拟了实验室鼓泡浆态反应器的行为 ,并利用模型考察了工艺参数如表观气速、催化剂浓度对反应的影响 ,对改进和提高低温液相浆态床反应器甲醇合成提供了信息 。

Due to the concurrence of carbonylation of methanol and hydrogenolysis of methyl formate (MeF) in a slurry reactor, methanol synthesis via MeF has the following advantages: low reaction temperature, high per pass conversion, good heat transfer and direct utilization of crude methanol product as fuel, thus it is a more efficient and more economic methanol production process than the conventional methanol process. A model of the low temperature methanol synthesis (LTMS) via MeF in a bubble column slurry reactor (BCSR) is presented. The model assumes: the gas phase being in plug flow and unmixed slurry phase, catalyst concentration distribution is described by the sedimentation-dispersion model. Liu's non-linear reaction kinetic expression for LTMS over G-89 catalyst is used in the model. The effect of various operating variants which include temperature, pressure, superficial gas velocity and catalyst concentration on the reactor productivity are studied. Computation results show that the higher the reaction temperature is, the higher the equilibrium conversion and productivity of methanol will be. Increasing the gas superficial velocity leads to a gradual drop in syngas conversion, while STY goes through a maximum. Under slurry operation condition, high catalyst concentration improves the viscosity of slurry which tends to form large bubbles and, in return, also reduces gas-liquid interfacial area and the residence time of gaseous components in reactor, which affects the efficiency of reactor.