Recycling

Plastics are created primarily from energy feedstocks, typically natural gas or oil, or coal in the case of South Africa. The hydrocarbons that make up plastics are embodied in the material itself, essentially making plastics a form of stored energy, which can be turned into a liquid fuel source.
While the weighted average life (time to disposal) of all plastic is eight years, more than 40% of plastics have a life-span of less than one month, meaning that significant volumes of waste are generated annually. Post-consumer plastics make up a major portion of municipal solid waste and appear in waste streams from agriculture, distribution and packaging, construction and demolition, automotive, electrical and electronic applications. The fraction of plastic in municipal solid waste comprises 60% polyolefins (POs) such as high density polyethylene, low density polyethylene and polypropylene, which is desirable from a PTL standpoint since they are the most suitable candidates for quality plastic-to-liquid fuel production
Plastic’s durability is also its worst enemy, as plastic in landfills can take several hundred years to degrade. One of the characteristics is that all plastics can theoretically be recycled, either into other materials, such as polyethylene terephthalate (PET) bottles which end up as pillow stuffing, or others which are returned to the resin state for re-use as other plastics.
Pyrolysis
Pyrolysis is a recycling technique which converts plastic waste into fuels, monomers, or other valuable materials by thermal and catalytic cracking processes. It allows the treatment of mixed, unwashed plastic waste. For many years research has been carried out on thermally converting waste plastic into useful hydrocarbons liquids such as crude oil and diesel fuel.
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