APPARATUS FOR HEAT TREATMENT OF POLYESTER PARTICLE AND METHOD OF MULTISTAGE SOLID-PHASE POLYCONDENSATION OF POLYESTER PARTICLE

摘要

A multistage method for solid-phase polycondensation of polyester particles, comprising continuous polycondensation in: (1) a first fluidized bed; (2) a first moving bed; (3) a second fluidized bed; and (4) a second moving bed in the stated order along a flow of the particles, wherein the second moving bed has a capacity twice or more as large as a capacity of the first moving bed, is provided.