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EPS Recycling Plants - even for EPS with hazardous HBCD
EPC's recycling plants for expanded polystyrene (EPS) are not only highly efficient, but also offer a profitable and environmentally friendly recycling for different PS (polystyrene) and EPS waste. The process was developed in collaboration with the renowned Fraunhofer Institute (IVV Freising) and CreaCycle GmbH. The resulting CreaSolv® Technology produces a high-purity PS Recyclate as a final product from PS and EPS waste.
Various precisely coordinated cleansing steps, the use of selected CreaSolv® formulations and specially tailored separation and filtration steps efficiently remove a wide range of contaminants. This also includes EPS additives such as HBCD (Hexabromocyclododecane), which can be depleted below the permissible limits. The final product is a high purity and odorless PS granulates. Compared to conventional mechanical recycling processes, which cannot extract toxic and hazardous substances contained in polystyrene, EPC’s EPS recycling plants based on the CreaSolv® Technology produce high purity polystyrene. This process also offers great ecological advantages over waste disposal methods used to date for EPS / PS waste.
EPS is not only a common packaging material, but has been used as an insulating material for more than 50 years e.g. it has been installed on over 80% of exterior walls in Germany. Till 2015 this sort of EPS insulation was equipped with HBCD, a substance of which production and use are now banned worldwide. HBCD is placed on the so-called POP list (persistent organic pollutant) and wastes that contain this substance have to be destroyed residue-free, which means that in the future, mechanical recycling is no longer possible and only the chargeable waste incineration remains. For waste incineration plants, however, EPS, with its high calorific value, is a challenge and can only be combusted together with other waste in low concentrations.
Apart from the incineration or dumping of EPS / PS wastes containing hazardous substances and pollutants, EPC’s system for recycling EPS based on the CreaSolv® process now provides an alternative close-looped economical recycling cycle for waste streams containing PS, a process that fulfills "Circular Economy" concept of the European Union. In contrast to established mechanical cleaning processes, EPS Recycling can process material streams with impurities and hazardous substances using the CreaSolv® Technology. Adhesions, embedded contaminants, embedded dangers and odors are reliably removed from the inlet stream (e.g. in compliance with current POP regulations) with the CreaSolv® Technology. Based on our standard designs of the EPS CreaSolv® recycling systems, individual adaptations according to customer requirements are possible. We also offer our customers production-accompanying R & D services within our aftersales service scope. This flexibility offers our customers and the environment a clear added value compared to the well-known and established procedures.
EPC variPLANT® is a flexible plant concept for polymer manufacture. Amongst other things, we use this concept to plan and develop polycarbonate plants. With this continuous process technology, the EPC Group offers you a future-proof plant design backed up by efficient project execution that saves time and money. This all comes from one source, starting from the reactor system and progressing through a process-optimised rectification and modern vacuum system to efficient process control.
EPC variPLANT® gives you the following competitive advantages:
- Highly flexible production
- Consistent product quality of the highest standard
- Gains from economies of scale
- Compact plant design
- A high degree of automation and ultra-modern process control
- Technology for efficient consumption of energy and operating materials
- An environmentally friendly design that meets the requirements of EU standards
Over the course of its typical 40 to 50 year lifecycle, an industrial plant is repeatedly modified, modernised and optimised. EPC PETvantage® is a patented, customer-orientated revamping (upgrading) and de-bottlenecking process that meets your need to maximise plant profitability with minimum retrofitting costs and downtimes.
EPC PETvantage® is the most cost-effective alternative to investing in a new plant. Depending on the plant configuration, a return on the investment is usually achieved in less than 2 years. In most cases, the main reactors do not need to be replaced. Operational safety, product qualities and production capacities are increased by a multiple, depending on the basic design of the plant and the space available on site.
EPC PETvantage® generates very high profits, mainly through quality assurance and the consequent greater competitiveness:
- Plants converted to use alternative raw materials or produce new types of polymers
- Conversion from textile to bottle PET
- Flexibility – thanks to polymer modification for the production of specialities
- Versatility through direct spinning to produce fibre and filament yarn specialities
- Lower consumption, for example, of blue toner
EPC inside PET® is an operating software developed by EPC for the fully automatic operation and quality control of plants using the innovative EPC polyester process. EPC inside PET® evens out fluctuations in the quality of the raw materials. The consistency of the final products produced by existing plants is significantly improved by the comprehensive, intelligent process control. We offer EPC inside PET® either as a stand-alone solution or in combination with the process optimisation and higher capacity gained with our tried and tested EPC PETvantage® technology.
Commercial and qualitative advantages of EPC inside PET®:
- Waste and "out of spec" products reduced by more than 80%
- Freer choice in the purchase of raw materials, unaffected by fluctuations in raw material quality
- Continuous plant operation and control increase capacity
- More stable product quality
Cyclohexanedimethanol (CHDM) is a high value co-monomer used in the production of various polymers e.g. PETG, PCT, PCTG and PCTA to enhance the strength, clarity, and solvent resistance of polymers. CHDM is produced via a two-step catalytic hydrogenation of DMT. DMT is firstly hydrogenated into the intermediate DMDC and then further into CHDM.
EPC Group has vast experience in the polymers and fibers industry and offers complete engineering packages in delivering world-class polymer/fiber manufacturing plants. For the production of high-quality PETG, PCT, PCTG and PCTA, EPC Group offers its modern CHDM Hydrogenation Technology for the production of top-grade CHDM.
EPC’s highly efficient and flexible continuous hydrogenation process guarantees a feasible production of top quality CHDM. Furthermore, having your own state-of-the-art CHDM production line will ensure a continuous supply of high-grade CHDM as raw material for the manufacturing of high value polyesters resin for the fast growing technical applications in electronics, food and medical packaging, construction components and consumer goods.
Masterbatch, also known as colour granulate, is a granular plastic additive. The content of dyes or additives in the granulates is higher than in the final application. Masterbatches are added to change the properties of the raw polymer to make it suitable for its later intended use. They increase process safety, and are very easy to process in comparison to pastes, powders and liquid additives.
In the refining process, the desired additives are added to the raw polymer material in a mixer, and intermingled in the extruder. The melt is then allowed to solidify again in a cooling trough, after which it is cut up in the granulator. With the masterbatch process, EPC enables its customers to change the products their plants produce quickly and keep cleaning costs low. Energy-efficient extruder systems are long lasting, and economical because the waste heat from the extruders is fed back into the entire plant for re-use.
As the polymerisation reaction does not achieve 100% caprolactam conversion, the polyamide 6 product still has a residual monomer content. After polymerisation, this residual monomer is extracted from the polymer, and fed back into the process. The product is fed out of the cooler into the post-condensation device, which works in a nitrogen atmosphere in the absence of oxygen.
The process patented by EPC enables the material to be optimally substituted by means of nitrogen evolution in combination with a higher pressure. This significantly reduces the extract content in the granulate, while at the same time enriching the extract water to about 18%, and achieving a considerably more consistent retention time. This minimizes fluctuations in the extraction concentration.
The extraction process developed by EPC can also be used in existing plants without requiring any large investments or lengthy modernisation times. A special device distributes nitrogen into up to 16 extraction zones in the column. Granulate flows from top to bottom through a packed bed in the device.
The nitrogen and extract water are fed upwards in a counter-flow. The extraction rate depends on the number of trays, which is determined on a case by case basis. The device consists of trays arranged one above the other. Nitrogen is distributed homogeneously through these trays.
Advantages of the solution patented by EPC:
- Formation of many extraction zones in one extractor (12 to 16 zones)
- High utilisation rate of the extract volume (up to 98%)
- The extraction effect improved by maintaining a highly consistent retention time for the granulate in the extractor combined with the high homogeneity of the water in the zones create the conditions for keeping the extract content of the granulate within tight tolerances
- A specific, differentiated diffusion drop within the zones enables the highest extract water concentrations to be obtained at the outflow (> 18%) while simultaneously reducing the residual extract content in the granulate (< 0.25%).
- Existing extractors retrofitted with short shutdown times and low investment costs
- Higher granulate capacity and product quality, low mechanical requirements
- Short return on investment time with substantial energy savings in the lactam recovery, maximum energy efficiency
- Minimized vapor consumption for recovery, smaller vaporizer plants for new investments
- Reduction of plant size, volume and height, smaller space requirement with higher capacities
- Reduced specific granulate production costs
Compounding is a special synthetic refining process. The admixture of additives optimizes the properties of the polymer. Different quantities of granulate can be produced by varying the formulation, raw materials and the operating mode of the extruder. The additives – such as glass fibers, flameproofing agents, UV stabilizers, impact strength modifiers, carbon fibers, mineral fillers and dye pigments – are added to improve the properties of the granulates and make them suitable for their intended purpose.
Many polyacrylonitrile production plants use the suspension polymerization process. Numerous earlier plants have had to be shut down after just a few weeks for thorough cleaning on account of contamination and deposits building up in the apparatus, which always involves lost production. Previous reactors have usually had to be replaced after just a few years because of high material abrasion.
EPC has developed a reactor material based on a special aluminium alloy that is inert under the reaction conditions (no material abrasion), and consequently has no effect on the reaction medium (no uncontrolled reaction behaviour). The material is used in the manufacture of the reactor and in the up and downstream stages involved in the polymerization reaction. Plant components made of this material do not have to be replaced during the projected lifetime of the plant.
Avoiding deposits building up lengthens production cycles. Less frequent cleaning increases the production capacity and reduces the use of cleansers. The material has strength properties similar to those of steel, and can be worked with conventional machining and forming processes (rolling, bending, grinding, polishing, welding).
The process developed by EPC covers many factors that have a great effect on the profitability of a plant. Handling phosgene is technologically demanding, and highly dangerous for people and the environment. EPC is therefore focusing on a phosgene-free process. The phosgene-free EPC technology for producing polycarbonate considerably reduces the impact on nature and the environment. The by-products of the production of raw materials can be almost completely recycled. For example, the waste water is not contaminated, and can be fed directly into the normal waste water treatment (sewage plants).
EPC has developed a modular spinning system that offers you a highly efficient and flexible, complete solution for your filament production. EPC variYARN® is ideal for quick, trouble-free product changes. With EPC variYARN®, you can fulfill your customers' requests at all times with individual PET, PA or PBT filament yarns for each spinning position, such as POY or FDY speciality yarns (NC, HC or micro), and with the most diverse color nuances or degrees of matting.
- Individual spinning positions with gravimetric masterbatch dosing for changing the formulation quickly
- Individual extruder and additive dosing capable of modular expansion
- Upgradable for liquid dye dosing technology
- Upgradable for polypropylene spinning (PP)
- Shortest product retention times for optimal properties
- Individual spinning point parameterization
EPC variPILOT® gives you the flexibility to test new formulations and optimize additive consumption. The quick simulation of new process parameters saves time, while any defective batches have no effect on the quality of your main production. Another advantage is the low consumption of raw and operating materials.
Choosing EPC variPILOT® is a good decision. We examine the site, and specify the future location of your pilot plant before we configure it. We plan and construct your specific test plant in accordance with the conditions, the product parameters and your requirements. We deliver your variPILOT®plant pre-assembled, so it can be quickly and easily installed and commissioned.
- All the necessary ancillary plants and even a laboratory are available
- Basic, detailed and turnkey engineering – all from one source
- Flexibility to meet every degree of complexity of your customers' requests
- High productivity with maximum variability of your production program
- Longer campaigns with economical batch sizes (waste and intermediate products are minimized)
- More economical than other comparable large extruder plants
- Highly variable number of Variyarn® modules per spinning line, for example 2, 4, 6, 8, 10 or 20 spinning modules