A recycling process for polyethylene terephthalate using calcium oxide catalyst.

Abstract

This invention provides a method for recycling polyethylene terephthalate using an oxide-based catalyst. Calcium was prepared from ostrich eggshell fragments using the depolymerization process. By glycolysis reaction, using a catalyst made from calcium oxide prepared from eggshell fragments. Ostrich meat mixed with plastic fragments from polyethylene terephthalate bottles in an ethylene glycol solution. The contents are stored in containers that are kept at a constant temperature by placing these containers in sand. The contents are contained within a container placed on a heating plate, with the top of the container fitted with... Equipment for enabling ethylene glycol reflux, including catalytic synthesis. From calcium oxide prepared from ostrich eggshell fragments for use in the aforementioned recycling process.

Claims

OCR 09WP 04 / 07 / 2568 1. A process for recycling polyethylene terephthalate using calcium oxide catalysts. The recycling process for polyethylene terephthalate involves the following steps: A. Take the plastic scraps from polyethylene terephthalate bottles that have been washed and dried, which... Prepared for use in recycling polyethylene terephthalate, it is mixed with a calcium oxide catalyst. Prepared from ostrich eggshell fragments, where the amount of calcium oxide catalyst was... Prepared from ostrich eggshell fragments, with an appropriate ratio of 1 percent by weight of plastic bottle waste. Total polyethylene terephthalate B. Add an ethylene glycol solution in an amount 15 times the weight of the plastic scraps from the bottle. All types of polyethylene terephthalate are mixed with a mixture of polyethylene terephthalate bottle waste. And the catalyst from calcium oxide obtained from step A is then added to the mixture of plastic bottle waste. Polyethylene terephthalate and calcium oxide catalysts in ethylene glycol solution are used. In a container, the temperature is controlled to maintain a constant temperature by placing the container in a state of being filled with sand. Inside a container placed on a heating stove at a temperature of 192 degrees Celsius for a period of 2 Hours under reflux conditions of ethylene glycol are used to obtain a solution of polyplastic. Ethylene terephthalate recycling C. Stop the reaction by introducing a solution of recycled polyethylene terephthalate plastic that has been treated. After heating for the duration and conditions specified in step B, freeze at the following temperature. 0 degrees Celsius until the solution of all recycled polyethylene terephthalate plastic changes state. Solid for 12 hours. D. Take the solid recycled polyethylene terephthalate product obtained from step C. It is extracted using hot water and filtered to remove byproducts and catalysts. Then the solution of... Recycled polyethylene terephthalate plastic is heated until the solution becomes homogeneous. The process involves using a solution of recycled polyethylene terephthalate plastic that has been extracted using hot water. From step D, freeze again at 0 degrees Celsius for 12 to 24 hours. f. Allow the solution of frozen recycled polyethylene terephthalate plastic to dissipate. Step C: Dissolve at 15 degrees Celsius for 48 hours to obtain a solution containing monomers. (monomer) is settled in the sediment. B. Filter the solution containing the precipitated monomer from step C to collect the monomer. The resulting monomer is then dried in an oven at 60 degrees Celsius for 24 hours. The product is a fine, off-white, needle-like crystalline mass of the monomer bis(2-hydroxyethyl) terephthalate. (bis(2-hydroxyethyl)terephthalate; BHET) 2. A recycling process for polyethylene terephthalate using calcium oxide catalyst. Claim 1, where the most appropriate procedure involves the following steps: A. Collect the plastic scraps from polyethylene terephthalate bottles that have been washed and dried. This is prepared for use in recycling polyethylene terephthalate, in an amount equal to 5 grams, and mixed with the catalyst. The reaction involved calcium oxide prepared from ostrich eggshell fragments in an amount equal to 50 milligrams. B. Add 75 grams of ethylene glycol solution to the plastic waste mixture. The polyethylene terephthalate bottle and the calcium oxide catalyst obtained from step A are then used. A mixture of polyethylene terephthalate (PTTE) plastic waste from bottles and an oxide catalyst was used. The calcium in the ethylene glycol solution is stored in a temperature-controlled container to maintain a constant temperature. The containers were placed in sand inside another container which was then placed on a heating stove. At a temperature of 192 degrees Celsius for 2 hours under conditions of ethyl reversibility. Lean glycol is processed to obtain a solution of recycled polyethylene terephthalate plastic. C. Stop the reaction by introducing a solution of recycled polyethylene terephthalate plastic. After being heated for the specified time and under the conditions determined in step B, it is then frozen at the specified temperature. The temperature is equal to 0 degrees Celsius until the solution of all recycled polyethylene terephthalate plastic changes state. It remains solid for 12 hours. D. Take the solid recycled polyethylene terephthalate product obtained from step C. Extract the solution using 500 ml of hot water and filter to remove by-products and catalysts. The solution of recycled polyethylene terephthalate plastic is then heated until the solution... Becomes one with the other. The process involves using a solution of recycled polyethylene terephthalate plastic that has been extracted using hot water. From step D, freeze again at 0 degrees Celsius for 12 hours. f. Allow the solution of frozen recycled polyethylene terephthalate plastic to dissipate. Step C: Dissolve at 15 degrees Celsius for 48 hours to obtain a solution containing monomers. Settling B. Filter the solution containing the precipitated monomer from step C to collect the monomer. The resulting monomer is then dried in an oven at 60 degrees Celsius for 24 hours. The product is a fine, off-white, needle-like crystalline mass of the monomer bis(2-hydroxyethyl) terephthalate.

3. A recycling process for polyethylene terephthalate using calcium oxide catalyst, as follows: Either of claims 1 or 2, where a calcium oxide catalyst is prepared from eggshell fragments. Ostrich eggs are used in the recycling of polyethylene terephthalate through the depolymerization process. The glycolysis reaction has the following synthesis process: A. Wash the ostrich eggshells thoroughly. Then, take the ostrich eggshells... After being thoroughly washed, they are then dried in an oven. B. Take the dried ostrich eggshells from step A and grind them into a powder. Then, use this powder... The crushed ostrich eggshells are sieved to obtain a finely ground ostrich eggshell powder. C. Take the finely ground ostrich eggshell powder, which has been sieved in step B, and burn it at a certain temperature. Heating at 1000 degrees Celsius for 5 hours will yield a catalyst from freshly calcined calcium oxide. It's still hot. D. Release the catalyst from the calcium oxide, which is still in a hot state from step C. Allow it to cool, and then grind the cooled calcium oxide catalyst again into a fine powder.

4. A method for recycling polyethylene terephthalate using calcium oxide catalyst. Under either claim 1 or 2, where waste polyethylene terephthalate bottle plastic scraps are processed. Here's how to prepare it: A. Wash and peel off the plastic coating from used polyethylene terephthalate bottles. Remove the labels, then dry the cleaned polyethylene terephthalate bottles in an oven. B. Take the dried polyethylene terephthalate plastic bottle from step A and cut it into... Small pieces C. Wash the plastic scraps from the polyethylene terephthalate bottles obtained in step B with [method 2]. The material was soaked in a sodium hydroxide solution at its molar (M) level for 2 hours, then dried before use. The reaction begins.