Polyester polyol reactors
Polyol synthesis technology
H&S technology for generating aromatic polyester polyols (APP) from polyethylene terephthalate (PET) as well as phthalic acid anhydride (PA) is based on:
- natural oil
- adipic acid polyester
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)
- Phthalic acid anhydride (PA)
- Adipic acid
- Glycol
- Monoethylene glycol
- Glycerol
- Catalysts
- Natural oil
PET and PA polyols properties
PET based polyols are aromatic polyester polyol for application in rigid PU foam
| Hydroxyl number: | from 150 to 550 mg KOH/g (individually adaptable) |
| Acid number: | <1,0 mg KOH/g |
| Aromatic content: | 25-42% |
| Viscosity (25°C): | 1.500-20.000 mPas |
| Appearance: | viscous transparent liquid from colorless to light-brown color |
PA based polyols are aromatic polyester polyol for application in rigid PU foam
| Hydroxyl number: | from 150 to 500 mg KOH/g (individually adaptable) |
| Acid number: | 0-2,5 mg KOH/g |
| Aromatic content: | 25-45% |
| Viscosity (25°C): | 1.500–12.000 mPas |
| Appearance: | viscous transparent liquid from colorless to light-brown color |
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).
Product applications
Polyols based on PET and PA are high-quality polyester polyols, which fit perfectly into the formulations for insulation foams, cast resins, sealants or adhesives.
Application example
Spray foams
Reactor and peripheral equipment (Core unit)
H&S reactors for generating polyols based on PET and PA can be supplied with batch capacity from 1t to 40t.
