Process for the production of granulates polyester low hydrolysis from melts of high viscosity polyester and device for the production of the polyester pellets and polyester granulate low hydrolysis

摘要

Process for the direct production of polyester granules low hydrolysis from a fundidade mass high viscosity polyester with a degree of polymerization (DP) of 132 to 165, wherein the mass sesomete molten predrying and drying / degassing after a process of hot cutting, in which LAFASE cutting in the cutting process heat is carried out at water temperatures from 70 to 95 ° C and semantiene a bath ratio which is the ratio of water to microgranules / pellets 8 to 12: 1, yel bath completely preserved until the entry into the predrying and the circulating water is separated in prior elsecador within 10 seconds, wherein the granulate is conveyed from the recipientecolector ( 7) to drying in a drying / degassing (8) with a tempering zone (20) and cooling unazona (21) by means of a hot air transport, carrying out drying and enfriamientocombinado and performing drying over 6 to 12 hours at 150 to 180 ° C, preferably of 160-175 ° C and cooling over 0.5 to 1.5 hours down to 50 ° C.