| Abstract [eng] |
Technological line of the amorphous PET pellets manufacture process was designed in the final Master‘s project. The capacity of this process is 500 t / d. Amorphous PET pellets take an important place in today's world, such as in various packaging (for the food industry, but widely used in other fields as well) bottles of the beverage industry, films, pellets are included in some synthetic fibers composition. Becauce of the large scale of plastics usage (as is well known in the market, there are endless other types of plastics) plastics are recyclable. There are a few ways to recycle plastics: physical, thermal and chemical. Currently, the most widespread is the physical method of plastics recycling, which has a simple mechanism, but due to changes in the primary properties of plastic, more and more research is being done to try to chemically recycle plastic. Therefore, the results of the experiment in the laboratory is performed. It was performed depolymerization of PET amorphous plastic into monomer - BHET, are presented, which catalyst is suitable and what conditions are required to perform the experiment. Based on the obtained results, the selected catalyst was zinc acetate, which was teak for the reaction, and important conditions were determined, such as: during the purification of the monomer, it is necessary to filter the product which is still hot. It is known that BHET is soluble in hot water. As the sulution cools crystallization begins, so it is important to use filters with jackets during filtration. Considering into the experimental conditions, the technological line of amorphous PET plastic chemical processing is theoretically provided. After optimization of this process could be implemented in the amorphous PET granule production process to produce PET amorphous pallets with a certain percentage of chemically processed plastic. The final project provide the mass balance of the amorphous PET pallets production process, calculates of theoretically required amount of chemically recycled plastic. It was selected the required equipment and provided their specifications. It was rated the environmental performance of the PET amorphous plastic production process, were defined safety and health issues, were submitted the construction drawings of one floor of the building and calculations of economcis. |
