Polyester Polyol Reactors  (PET/PA):

Polyol synthesis technology:reactors-hs-anlagentechnik_20

H&S technology for generating aromatic polyester polyols (APP) from polyethylene terephthalate (PET) as well as phthalic acid anhydride (PA) is based on the glycolysis method


Process sequence and duration (polyol generating based on PET):







Process duration for generating PA based polyols makes approx. 12 hours


Raw materials required for the processes:

Polyethylene terephthalate (PET):

– flakes from PET bottles
– preforms out of specification
– dust and granulate (preforms production waste)
– fibers

Phthalic acid anhydride (PA):

is an organic compound. It is a colorless solid. PA is widely used for the largescale production of plasticizers for plastics, polyester and alkyd resins.

Adipic acid:


is the organic compound, dicarboxylic acid. It is used mainly for the production of nylon, plasticizers for PVC as well as polyamide fibres and resins. Significant amount is used in the food industry as a flavorant and gelling aid.

Diethylene glycol:

is an organic compound. DEG is used in production of unsaturated polyester resins, plasticizers, acrylate and methacrylate resins and urethanes.

Monoethylene glycol:

is an organic compound. It is widely used for manufacturing of polyester resins (PET) as well as automotive antifreezes and coolants



belongs to the alcohol family of organic compounds. It is widely used in manufacturing of coa- ting resins, softening agents and plasticizers as well as in pharmaceutical formulations.





PET and PA polyols properties:

PET based polyols are aromatic polyester polyol for application in rigid PU foam.

PA based polyols are aromatic polyester polyol for application in rigid PU foam.


Adipatic polyols:

H&S also has developed a technology of generating adipates. Adipates are polyols based on adipic acid used for CASE applications (elastomers, shoe soles and coatings).



Application examples of polyester polyols based on PET and PA:




Application examples:

hs-anlagentechnik_spray-foams hs-anlagentechnik_insulation-panels

Spray foams                                               Insulating panels



Reactor and peripheral equipment:

core unit




1. Reactor
2. Feeding system for PET or PA
3. Feeding system for adipic acid
4. Filtration system


H&S reactors for generating polyols based on PET and PA can be supplied with batch capacity from 1t to 40t.