New Process Development Of Methylal With Reactive Distillation Technology

The conventional production of methylal has the defects of the low production, low purity and large waste water. So reaction and separation were carried on at same time by using reactive distillation technique, and the high pure methylal can be obtained. The production and purity were increased highly and the waste water can be used as absorbing water, so the water pollution was resolved completely.The influences of reactive temperature, reactive time and concentration to the reaction rate were researched in the reacting system and the reaction kinetics equation:On the base of slightly tries, we voluntarily constructed reactive distillation tower with 8 reactive levels, the experiment was researched by feeding continuously, controlling the appropriate reflux ratio, obtaining the high pure methylal from the top tower and obtaining the waste water from the bottom tower. The parameters in the continuous production, temperature and concentration distribution at different levels were measured, they provided design parameters to the industrialization design.ASPEN PLUS was used to simulation in this process, the simulation values and the experimental results tally, it is indicated that this software can be used in the process simulation of methylal's production.With the extract distillation technique, we took the glycol as the extracting agent, discussed the effects of reflux ratio, extracting agent and feeding temperature and so on to methylal purity.In view of the quick reaction rate and the low reactive equilibrium ratios in the condensation reaction between methyl alcohol and formaldehyde, the new response rectifying tower contents structure and the corresponding hydraulics data were measured, we obtained the structure parameters of new reactive distillation tower contents and the feasible production scheme of methylal.