2results about How to "Process operation is stable" patented technology

The present application relates to polyester recycling, and provides a method for improving the yield and purity of regenerated BHET. After glycolysis of waste polyester in the presence of a metal catalyst, most of the free glycol is removed by evaporation under reduced pressure. A chelating agent composed of a polycarboxylic acid chelating agent and an organic phosphonic acid compound is added to the glycolysis solution, and a fixed bed circulation contact of a solid-supported chelating agent with polycarboxylic acid groups supported on a porous carrier is used to remove metal ions. Subsequently, the glycol is further removed by thin film evaporation to obtain a BHET-rich glycolysis solution. Finally, the distillate is collected in a short path distiller according to the set switching conditions of BHET content and acid value to obtain a high-purity BHET product. This method can inhibit re-polymerization and thermal degradation, reduce metal residues and oligomer content, and improve the yield and purity of BHET.

The utility model relates to a kind of robot press line, especially in the technical field of steel drum processing equipment.It includes flange feeding mechanism, conveyor, barrel cover turnover mechanism, unstacking robot, carrying robot, locking punch press, stacking robot.Overcome the current barrel cover in the process of locking flange, usually adopt manual stamping mode, this mode labor intensity is big, labor cost is high and there is the problem of hidden danger.