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PET SSP Stand-alone Process

POLYMETRIX has continuously developed the SSP stand-alone process to reduce Operating Expenditure (OPEX) and Capital Expenditure (CAPEX). Thanks to various process developments such as the pretreatment of amorphous materials and energy and raw material recovery, we can offer our industrial customers cost-effective solutions for the production of polymers with high viscosity.

POLYMETRIX SSP stand-alone processes are used when SSP must function as an independent unit because it cannot or should not be integrated into the CP process. The SSP stand-alone process incorporates a proven "pellet-to-pellet" crystallization process and is used with cold amorphous PET as input material. After crystallization, the PET pellets are preheated to SSP process temperatures, conveyed hot, subjected to the SSP reaction, and cooled. Nitrogen from the process is continuously purified using catalytic combustion or an ethylene glycol gas scrubber.

Features and advantages

  • Capacity range from 10 to 2200 t/d
  • Standard single line concepts 450 t/d, 600 t/d, 750 t/d, 900 t/d and 1100 t/d for vPET
  • Standard double line concepts for production optimization
  • Initial viscosity from 0.4 dl/g
  • Feed of amorphous PET from intermediate storage silos
  • Pellet-to-pellet crystallization of amorphous PET
  • Hardening process for highly modified PET (optional)
  • Strand pelletizing for cylindrical pellets or underwater pelletizing for spherical pellets
  • All process steps under nitrogen (crystallization and cooling under air or nitrogen)

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