Global Kinetics Of Methanol Synthesis And Mathematical Simulation For Bubble Column Slurry Reactor

Comparing to the traditional production technology, the methanol synthesis in three phase bubble column slurry reactor(abbreviated three phase reactor)has many advantages, such as, high conversion of synthesis-gas per pass, high methanol concentration at the outlet of reactor, isothermal temperature in slurry bed, easy temperature control.The kinetics of methanol synthesis over new type catalyst C307 with the size of 80～120 mesh and liquid medical paraffin as inert liquid phase, was investigated experimentally in a three phase slurry reactor with mechanical agitator at temperature of 210 to 250℃, pressure of 4.5 to 6.5 MPa and space velocity of 800 to 2000 h-1.In the range of the experimental conditions, the conversions of CO and CO2 increased firstly and then decreased with temperature with a maximum at about 220℃, increased monotonically with pressure and decreased with space velocity.The kinetic models of the Langmuir-Hinshelwood type were derived in terms of the hydrogenation reaction rates of CO and CO2 in the form of the fugacity, and the parameters of the models were obtained through Universal Global Optimization integrated with Marquardt method. It was proved by residual analysis and statistical test that the kinetic models are reliable.Combining with the kinetics, the mathematical model of the three phase methanol synthesis reactor was established, and the axial distribution of the concentration of components in the reactor was simulated. The influence of the different operating conditions on the performance of the reactor was investigated, which provided a basic data for the design of the three phase reactor.