Polyethylene recycled

Keywords Polymer concrete, polyester, polyethylene, recycled materials... 

The distribution of the products obtained from this reaction depends upon the reaction temperature (Fig. 5.2-2) and differs from other polyethylene recycling reactions in that aromatics and alkenes are not formed in significant concentrations. Another significant difference is that this ionic liquid reaction occurs at temperatures as low as 90 °C, whereas conventional catalytic reactions require much higher temperatures, typically 300-1000 °C [90j. A patent filed under the Secretary of State for Defence (UK) has reported a similar cracking reaction for lower molecular weight hydrocarbons in chloroaluminate(iii) ionic liquids [91]. An example is the cracking of hexane to products like propene and isobutene (Scheme 5.2-40). The reaction was... 

Keywords blend, block copolymer, compatibilizer, functionalized polymer, graft copol)mer, polyethylene, recycle. 

The polyethylene recycling effort will most likely continue to increase in the future and will have an effect on the amount of polyethylene capacity that may be needed in the future. Certainly this type of recycling program will result in the more efficient use of hydrocarbon feedstock and should be encouraged by the polyethylene industry. 

Considering polyethylenes tested in these blends, LDPE and polyethylene recycled from greenhouse films gave the best results. 

PH)PE [OLEFIN POLYTffiRS - POLYETHYLENE - HIGH DENSITY POLYETHYLENE] (Vol 17) -as paper contamnants [RECYCLING - PAPER] (Vol 21)... 

Laboratory tests indicated that gamma radiation treatment and cross-linking using triaHylcyanurate or acetylene produced a flexible recycled plastic from mixtures of polyethylene, polypropylene, general-purpose polystyrene, and high impact grade PS (62). 

The solvent is 28 CC-olefins recycled from the fractionation section. Effluent from the reactors includes product a-olefins, unreacted ethylene, aluminum alkyls of the same carbon number distribution as the product olefins, and polymer. The effluent is flashed to remove ethylene, filtered to remove polyethylene, and treated to reduce the aluminum alkyls in the stream. In the original plant operation, these aluminum alkyls were not removed, resulting in the formation of paraffins (- 1.4%) when the reactor effluent was treated with caustic to kill the catalyst. In the new plant, however, it is likely that these aluminum alkyls are transalkylated with ethylene by adding a catalyst such as 60 ppm of a nickel compound, eg, nickel octanoate (6). The new plant contains a caustic wash section and the product olefins still contain some paraffins ( 0.5%). After treatment with caustic, cmde olefins are sent to a water wash to remove sodium and aluminum salts. 

Nor is it tme that poly(ethylene terephthalate) (PET) and high density polyethylene (HDPE) packaging are hsted 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 redect the material s recyclabihty. 

Important processes commercially used are the Selexol, the Sulfinol, and the Rectisol processes. In these processes, no chemical reaction occurs between the acid gas and the solvent. The solvent, or absorbent, is a liquid that selectively absorbs the acid gases and leaves out the hydrocarbons. In the Selexol process for example, the solvent is dimethyl ether of polyethylene glycol. Raw natural gas passes countercurrently to the descending solvent. When the solvent becomes saturated with the acid gases, the pressure is reduced, and hydrogen sulfide and carbon dioxide are desorbed. The solvent is then recycled to the absorption tower. Figure 1-1 shows the Selexol process. ... 

The two forms of polyethylene differ slightly in density. Linear polyethylene is referred to in the recycling business as /ligh-density polyethylene, represented by the symbol HDPE 2 on the bottom of a plastic bottle. The corresponding symbol for branched polyethylene is LDPE 4, indicating low-density polyethylene. (The smaller the number, the easier it is to recycle.)... 

Many procedures have been suggested to achieve efficient cofactor recycling, including enzymatic and non-enzymatic methods. However, the practical problems associated with the commercial application of coenzyme dependent biocatalysts have not yet been generally solved. Figure A8.18 illustrates the continuous production of L-amino adds in a multi-enzyme-membrane-reactor, where the enzymes together with NAD covalently bound to water soluble polyethylene glycol 20,000 (PEG-20,000-NAD) are retained by means of an ultrafiltration membrane. 

Polyethylene sack or T-shirt bags are stronger than paper bags, take up 30% less storage space, provide water and puncture resistance, recyclable, etc. 

Dow ABS Nylon 6/6 Polycarbonate Polyethylene, HDPE, LDPE, LLDPE, ULDPE Polypropylene HPPP, CPPP Polystyrene HIPS, GPPS, Recycled, Advanced Styrenic Resin SAN Polyurethane Elastomers Polyolefin Plastomer PC/ABS Crystalline Polymer ABS/TPU... 

NPRC National Polystyrene Recycling PETG polyethylene terephthalate... 

PET has the second highest scrap value for recycled materials, second only to that of aluminum.1 A typical PET beverage bottle consists of PET (60 g), polyethylene (1 g), and label and glue (5 g). Therefore, the PET bottle scrap must be separated before the PET can be recycled. The bottles are sorted at a material recovery facility and compressed. The compressed PET bottles are then washed and converted to flake by grinding. The flakes may be converted to pellets in an extruder. The pellets are more suitable for material handling. Currently recycled PET is being used to make food and nonfood containers, straps, sheeting, and... 

High Performance Polymers 13, No.2, June 2001, p.S365-71 SURFACTANTS BASED ON RECYCLED POLYETHYLENE TEREPHTHALATE FOR BREAKING WATER-IN-OIL EMULSIONS Abdel-Azim A-AA El-Sukkary M M A Egyptian Petroleum Researeh Institute... 

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... 

TERTIARY RECYCLING OF POLYETHYLENE MECHANISM OF LIQUID PRODUCTION FROM POLYETHYLENE BY THERMOLYSIS/ REACTIVE DISTILLATION... 

Recycling polymers is one way to minimize the disposal problem, but not much recycling occurs at present. Only about 25% of the plastic made in the United States is recycled each year, compared with 55% of the aluminum and 40% of the paper. A major obstacle to recycling plastics is the great variation in the composition of polymeric material. Polyethylene and polystyrene have different properties, and a mixture of the two is inferior to either. Recyclers must either separate different types of plastics or process the recycled material for less specialized uses. Manufacturers label plastic containers with numbers that indicate their polymer type and make it easier to recycle these materials. Table 13-5 shows the recycling number scheme. 

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