Recycling of polyethylene terephthalate

Japon, S., Leterrier, Y. and Manson, J.-A. E., Recycling of polyethylene terephthalate) into closed-cell foams, Polym. Eng. Sci., 40, 1942 (2000). 

INFLUENCE OF SMALL AMOUNTS OF POLYVINYL CHLORIDE ON THE RECYCLING OF POLYETHYLENE TEREPHTHALATE... 

Various SCFs, other than SCW, have been examined for the treatment of organic wastes and chlorinated hydrocarbons, and some of them have been commercially used. Supercritical methanol is often used, instead of SCW, under the conditions of t = 240-300°C and p = 8-15 MPa for selective decomposition or methylation of organic materials. One example is the recycle of polyethylene terephthalate (PET) bottles decomposing to its monomers by supercritical methanol [7]. 

Sirek, M. Vavra, M. Vesely, V. Drahos, J. The method of chemical recycling of polyethylene terephthalate waste. World Patent WO 2006-039,872. 

The concern about possible contamination of food containers means that they can be recycled to only nonfood contact uses in the United States. To reuse polyethylene terephthalate in contact with food, it must be broken down, purified (to remove metal compounds, colors, and such), and resynthesized (14.2). This has been done by hydrolysis, methanolysis, and glycolysis.162 (The solvolysis can be complete in 4-10 min when microwaves are used with a zinc acetate catalyst.163) (For nonfood uses, such as the use of polyethylene terephthalate in magnetic tapes, it may be sufficient to melt the polymer and filter out the chromium or iron oxides.164)... 

The container is made out of polyethylene terephthalate and can be sorted for recycling. 

Second, a molecule or molecular fragment can also be split which is called decomposition. To recycle bottles made of polyethylene terephthalate (PET) catalytic depolymerization is used to split the PET in valuable components. ... 

P. Klein, Solvolysis of Polyethylene Terephthalate in Brandrup/Bittner/Menges/Michaeli, Eds., "Recycling and Recovery of Plastics", Carl Hanser Verlag, Munich, New York (1996). 

Choi, Y. W., Moon, D. J., Kim, Y. J., and Lachemi, M. Characteristics of mortar and concrete containing fine aggregate manufactured from recycled waste polyethylene terephthalate bottles. Construction and Building Materials, 23,2829-2835 (2009). 

Recycled water bottles made of polyethylene terephthalate (PET) have found many uses, especially in the clothing industry. Some of the companies using recycled PET fabric include Billabong s Eco-Supreme Suede, Wellman Inc. s Eco-fi, and Reware s Rewoven. 

Polyethylene terephthalate (PET) is one of the most important commercial thermoplastic polyesters, which has been on the market since 1977 and is widely used in both industrial and household applications. Under specific conditions, plastics can be converted into their primary components for use in other chemical processes by chemical recycling. PET is a thermoplastic, and so recycling by chemical methods, which converts it into primary components, can be achieved. This study examines the optimal routes of the existing chemical methods. For chemical recycling, acidic hydrolysis is used and PET is converted into terephthalic acid (TPA) and... 

Once a consumer has purchased a material made of a polymer, the likelihood of it being recycled is dramatically reduced. In the United States there are three resins that are commonly recycled polyethylene, polypropylene, and polyethylene terephthalate, SPI (The Society of the Plastics Industry) recycling codes, found on the bottom of food containers, provide the consumer with information as to the recyclability of the material. Table 17,1 lists these codes. 

Dulio, V., Po, R., Borelli, R., Guarini, A. and Santini, C., Characterization of low-molecular-weight oligomers in recycled polyethylene terephthalate), Angew. Makromol. Chem., 225, 109-122 (1995). 

There are two main types of plastics thermoplastics and thermosets. What is the difference between them What is each type of plastic used for Polyethylene terephthalate (PET) can be recycled successfully into new and interesting materials. Research the trade name Ecospun on the Internet. What is this material, what is it made from, and what is it used for ... 

It is not true that polyethylene terephthalate) (PET) and high density polyethylene (HDPE) packaging are listed as 1 and 2 in the Society of the Plastics Industry (SPI) recycling coding system because they are the most recyclable. The numbers assigned to each plastic in the SPI coding system are purely arbitrary and do not reflect the material s recyclability. 

The most difficult recyclates are the MSW, which usually consists of more or less dirty plastics of various types and sources. According to one report [15] the plastic portion of MSW contains typically 50% PE (mainly low density polyethylene, LDPE), 8-14% polypropylene (PP), 15% polystyrene (PS), 10% polyvinylchloride (PVC) and 5% polyethylene terephthalate (PET), and 5% other polymers, while the hard packaging fraction consists of approx. 60% of PP and HDPE [16]. 

Figure 7.4 Classification and image processing results of a typical situation in polymer waste recycling (a) digital image (b) initial classification result (c) calculation of separation data based on the initial classification result (d) classification result after real-time image processing. A, B Polyethylene terephthalate (PET) bottles with paper labels, C PE bottle with paper label, D PE bottle with PE film label, E PP cup, F PS cup. Classification colour code red high-density PE green PS dark blue PET yellow PP light blue paper.

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