Recycling tertiary

By chemical treatment of scrap plastics, some useful products may be gained, such as monomers, oligomers, chemicals, or fuels. The method of 

The chemical stability of most plastics has been turned to advantage in this disposal route, that is using the waste as an inert filler. This route has been known for some number of years in the glass industry where low- 

Plastic waste is already used in a similar capacity. Poly(urethane) scrap from the shoe manufacturing industries are shredded and used as filler in the manufacture of the soles of shoes [11]. However, as yet there are no reports of plans to extend this disposal option to cover post-consumer wastes. 

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Journal of Thermoplastic Composite Materials 13, No.2, March 2000, p.92-101 TERTIARY RECYCLING OF AUTOMOTIVE PLASTICS AND COMPOSITES... 

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

Chicago, 11., 26th-29th Sept. 1995, p.270-4. 43C6 TERTIARY RECYCLING OF WASTE POLYURETHANE CAR SEAT FOAM Tatsumoto K Elam C C Looker M J Evans R J US,National Renewable Energy Laboratory (SPl,Polyurethane Div.)... 

Davos, 7th-10th April 1992, p.3/2-1 - 3/2-12. 8(13) TERTIARY RECYCLING OF POLYOLEFINS Meszaros M Amoco Chemical Co. 

Recycling plastics back to hydrocarbons (tertiary recycling) may offer significant promise. Three different options currently being evaluated for the tertiary recycling of polyolefins - refinery recycling, pyrolysis and depolymerisation - are discussed. 

Tertiary amine polymethacrylates, 20 471 tertiary-butyldimethylsilyl (TBDMS), cleavage of, 16 559, 560 Tertiary creep, 13 472 Tertiary diperoxyketals, 18 457 Tertiary metal phosphates, 18 840 Tertiary nitriles, 12 180 Tertiary phosphine oxides, 19 66 Tertiary phosphines, 19 64 Tertiary recycling, 21 449 of PET, 21 450... 

Some Bright Spots PET Bottles Reprocessing PET and Other Polymers Secondary Recycling Not Everything Is Easily Recycled Back to Basics Tertiary Recycling Recycling by Thermal Decomposition Practical Recycling... 

Classes 2 and 3 correspond to US FDA s category Physical reprocessing Secondary Recycling . Class 4 corresponds to US FDA s category Chemical Reprocessing Tertiary Recycling . 

G. Manos, Y. I. Yusof, N. H. Gangas, and N. Papayannakos, Tertiary Recycling of Polyethylene to Hydrocarbon Fuel by Catalytic Cracking over Aluminum Pillared Clays, Energy Fuels, 16, 485-489 (2002). 

S. C. Cardona and A. Corma, Tertiary recycling of polypropylene by catalytic cracking in a semibatch stirred reactor. Use of spent equilibrium FCC commercial catalyst, Appl. Catal. B Env., 25, 151 (2000). 

This chapter deals exclusively with tertiary recycling by pyrolysis and catalytic cracking of plastics waste alone and by coprocessing with petroleum residue or heavy oils to... 

TECHNOLOGIES FOR TERTIARY RECYCLING OF MIXED PLASTIC WASTE (MPW)... 

Tertiary recycling of MPW is getting a lot of attention as an alternative method to landfill disposal and mechanical recycling. Tertiary recycling includes both chemical recycling... 

In summary, pyrolysis is a tertiary recycling process that is used to break down large polymer molecules. In this process, the polymer samples are heated in an inert atmosphere, which causes the carbon-carbon bonds to break along the polymer backbone. This depolymerization step results in monomers (short-chained compounds) being formed. Generally, three types of products are formed from pyrolysis reactions gas, oil and char. All three have the potential to be nsed as a fnel or chemical feedstock. Depending on the feed polymer and the reaction conditions, different products can be obtained. The pyrolysis oil can either be used directly or can be nsed as a raw material for the petroleum industry [1-5]. 

The severe limitations on the mechanical recycling of plastic wastes highlight the interest and potential of feedstock recycling, also called chemical or tertiary recycling.17,18 It is based on the decomposition of polymers by means of heat, chemical agents and catalysts to yield a variety of products ranging from the starting monomers to mixtures of compounds, mainly hydrocarbons, with possible applications as a source of chemicals or fuels. The products derived from the plastic decomposition exhibit properties and quality similar to those of their counterparts prepared by conventional methods. 

Three commodity addition polymers, polyethylene, polypropylene and polystyrene, were the focus of this review. Although thermal decomposition of these polymers is one strategy used for tertiary recycling, it is inherently non-selective... 

Tertiary recycling of addition polymers require pyrolysis, which is a more aggressive approach. For mixed or unsorted plastics in particular, it is a practicable way of recycling. Pyrolysis is the thermal degradation of macromolecules in the presence of air. The process simultaneously generates oils and gases that are suited for chemical utilization. 

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