| abstract |
The invention relates to a separation and recycling method of waste PET methanol alcoholysis ionic liquid catalyst. First, solvent methanol and by-product ethylene glycol are removed by means of atmospheric distillation and vacuum distillation, and the product DMT is separated and removed, thereby The separation and recycling of the ionic liquid catalyst are realized, and the specific steps are: 1) adopting methanol alcoholysis to degrade waste PET, and obtaining impurity-containing DMT after the reaction; 2) adopting atmospheric distillation to remove the methanol component in the impurity-containing DMT 3) adopt the mode of underpressure distillation to remove the ethylene glycol component in the hetero-containing DMT; 4) adopt the mode of underpressure distillation to separate and remove the product DMT, and the main component of the residue is an alcoholysis ionic liquid catalyst, which can directly For the degradation of waste PET. The method is simple in process, maintains good catalytic performance of the obtained regenerated catalyst, and realizes the separation and recycling of waste PET methanol alcoholysis ionic liquid catalyst. |