Chemical Recycling of PET
Chemical recycling processes enable the treatment of heavily contaminated plastic waste, resulting in recyclates of virgin quality. Innovative processes allow used PET plastics to be returned to the material cycle. The purity of the recovered components is crucial for the quality of the end products and is enhanced by efficient filtration and cake washing
The polymers are broken down using solvents or enzymes. The quality of the monomer is achieved by precipitation with subsequent suspension separation. The BHS products indexing belt filters (TB) and rotary pressure filters (RPF) are used for this. A high purity of the monomers is achieved through multi-stage counter-current washing, whereby the consumption of washing liquid is optimized.
The rotary pressure filter (RPF) is suitable for the chemical recycling of PET. This device enables pressure filtration, cake washing and drying of the filter cake in a continuous process. The indexing belt filter (BF) takes a different technical approach to material separation, in which product quality is achieved via vacuum, washing and drying. BHS-Sonthofen's many years of experience in PET virgin material production is an advantage in the development of these filter technologies.
Pyrolysis: Thermochemical conversion for the recovery of recyclable materials
Pyrolysis: Thermochemical conversion for the recovery of recyclable materials
Pyrolysis is a thermochemical process in which organic compounds are broken down at high temperatures and in the absence of oxygen. The polymer bonds of thermoplastics, such as PE or PP, break down at temperatures of more than 380°C. This produces three main product groups:
- Longer-chain hydrocarbons (naphtha), the target fraction, which is removed as vapors and transferred to the liquid phase through recondensation. During condensation, steam can be generated via heat recovery, which can be used to generate energy.
- A fraction of volatile hydrocarbons that can be collected and recycled separately.
- A solid waste fraction consisting of impurities and tar.
BHS high-temperature reactor HTC-T: Efficient pyrolysis technology
BHS has developed a special high-temperature reactor (type HTC-T) for this application. This reactor is electrically heated and therefore does not require flue gases for heating like other pyrolysis appliances.
Apparatuses with a gross volume of up to 20 m³ and a design temperature of 650 °C are available. BHS offers test equipment including a condensation unit for process development. The processes can also be tested under overpressure.
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