Polyme waste

An alternative tactic to deal with the problem of polymer wastes is to make polymers degradable. The difficulty with this approach is that in making synthetic polymers degradable one of the greatest assets of these materials, namely their durability, may be eliminated. There is also the possibility that... 

CHEMICALS AND ENERGY FROM MEDICAL POLYMER WASTES. II. MALEATED PYROLYSIS PRODUCTS IN IPP/LLDPE PROCESSING... 

CHEMICAL DISSOCIATION OF AMIDE BONDS - RECYCLING OF PURE POLYMER WASTES... 

Schaumburg, 11., 3rd-4th Nov. 1994, p.232-45. 8(13) PYROLYSIS OF POLYMER WASTE Agarwal K General Motors Corp. 

Polymer disposal in an inappropriate manner creates environmental problems such as dioxin formation, catastrophic fires, breeding of rats, and mosquitoes. Several methods have been explored to utilize plastics and mbber waste in an environment-friendly manner. Some of the recent advances in mbber recycling are reviewed in this chapter with special emphasis to waste mbber reutilization in plastics and mbbers. The utilization of waster mbber powder in polymer matrices provides an attractive strategy for polymer waste disposal. 

Dutch law has indicated NAA as the technique of choice for the analysis of polymer waste (recycling). INAA has been recommended as the analysis technique for the determination of cadmium in industrial products. 

USA often wrong or false value on level measure device During maintenance polymer waste ignited an caused an explosion of the tank 3 1965 - 1989 USA,The Netherlands... 

Many synthetic polymers, including most plastics, do not degrade in the environment. What can be done with plastic and other polymer waste ... 

Besides mechanical recycling, the conversion of waste plastics into a petrochemical feedstock is another way for the recovery of the organic materials from a polymer waste. A basic problem is the removal of organobromine compounds. 

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.

No single method of recycling provides a practical method for handling polymer waste. To be effective, processes must be based on sound science and technology. In addition, a recycling program must make economic sense. There must be incentives for companies willing to participate to make a profit. Fed-... 

Ideally we would like to reuse plastic waste to form directly new plastic products, but mechanical reprocessing of used plastics into new products has so far limited application. It is restricted to the treatment of relatively pure and well-defined waste, mainly from polymer processing factories. Mechanical reprocessing of municipal plastic waste results in new products of quality inferior to their virgin plastic ones. Separation of waste to streams of the same polymer type on the other hand is still very expensive. This fact restricts the applicability of mechanical reprocessing in polymer waste that is homogeneous in type and properties. 

Zeolites are widely used in acidic processes and they are an obvious catalyst choice. The suitability of commercial cracking catalysts to degrade polymer waste is vital as one of the options of commercializing this polymer recychng method is to co-feed polymer waste to existing refinery crackers [13]. Furthermore, in the search for cheaper catalysts, clays and their pillared analogues are also introduced in the polymer catalytic degradation [16, 17]. 

The further utilization of products obtained by degradation of polymers (wastes and by-products of the plastic industry) is not solved yet. One possibility of their utilization is fuel-like application or mixing in fuels as blending components. It is important to... 

Thus, for the development of polymer waste recycling technologies it is helpful to be aware of the chemical composition of the pyrolysis products of those polymers which are typical components of plastic wastes. 

The Hamburg Fluidized-bed Pyrolysis Process to Recycle Polymer Wastes and Tires... 

Thermal properties of ethylene copolymers are studied frequently and reported in literature [64-70]. These studies were directed to the evaluation of copolymer properties, use of various catalysts for achieving pyrolysis in order to recover polymer waste [71-75]. Some studies on thermal properties of ethylene copolymers are summarized in Table 6.1.4. 

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