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The present invention relates to a method for obtaining a polymer for PET bottle again from resin bottle wastes containing polyethylene terephthalate (hereafter, this may be abbreviated as PET) as the main component. More specifically, the invention relates to a method carried out as follows: resin bottle wastes containing PET as the main component and further containing components different from PET are subjected to pretreatments of crushing, washing, removing foreign bodies etc.; the product is subjected to chemical reaction treatments to recover a high-purity dimethyl terephthalate (hereafter, this may be abbreviated as DMT) as an effective component; terephthalic acid (hereafter, this may be abbreviated as TA) is obtained through chemical reactions from the recovered DMT; and further the terephthalic acid is converted to a PET polymer for PET bottles.
Bottled water, once a rarity, is now found everywhere, in homes, offices, stores, airplanes, and restaurants. But more and more people are questioning whether the water, and the package it comes in, is safe, or at least safer than tap water -- and if the convenience is worth the environmental impact. Here are a few ways to PET bottle recycling line .Make Ice Pack : Freeze water in them to put in the picnic cooler or wherever, as the ice melts it does not make a mess everywhere.Turn them into Funnels : Cutting the bottom off a PET bottle can turn it into a super handy funnel for use in all sorts of applications.
A polyalkylene terephthalate, especially PET is manufactured and used in large quantities in the fields of living related materials such as fiber, film and resin, food related materials such as bottles for drinking water and carbonated drinks, and others because of its excellent chemical stability.
However, the disposal of wastes of fiber, film and resin products, and off-specification PETs, which are largely generated with increasing manufacturing quantities and consumption quantities, is presently becoming large social issues. Regarding material recycling, chemical recycling, thermal recycling etc., various methods have been proposed. Home-Made Candle Holder : Particularly useful for outdoor events or for keeping the breeze from blowing out your outdoor candles, cut the bottom off the bottle, invert and insert the candle in the neck of the bottleOn the other hand, although especially the disposal of PET, bottles among the wastes is becoming more serious due to bulkiness, only material recycling that recovered used PET bottles are remelted and fibers are produced from the molten matter, is realized as a PET recycling machine method. But, when melt molding is simply used, it is not possible to reuse as PET bottles because of the deterioration of physical properties.
Further, a refilling method that PET bottles are washed and refilled has issues regarding the following, that is, who paying the cost of recovery, the points of safety and hygiene, and limitation in the number of times of reusing. The PET bottles are ultimately disposed, and the method can not be an permanent countermeasure. Further, PET bottle wastes contain foreign resins represented by polystyrene (hereafter, this may be abbreviated as PS), polypropylene (hereafter, this may be abbreviated as PP) and polyethylene (hereafter, this may be abbreviated as PE) which are originated from PET bottle product-constituting materials, for example, labels, shrink films, base caps, caps or the like, foreign plastics such as polyvinyl chloride (hereafter, this may be abbreviated as PVC) and polyolefinic resins, aluminum derived from caps and aluminum cans, iron derived from steel cans, adhesives, pigments, dyes and others.
Timber Protector / Soften up those Hard Edges : The tops of fence posts and garden stakes can be covered with round bottle sections, protecting the timber from the weather or stopping you for accidentally causing yourself an injury when bending over the garden.Use as Home Brewed Beer Bottles : Home brew can be stored in these bottles very effectively.Even in a bale of PET bottles recovered through collection of classified refuse, the mixing of foreign materials is hardly avoided. Even in chemical PET recycling lines are decomposed to monomers constituting the PET polymer by using a solvent such as water, methanol (hereafter, this may be abbreviated as MeOH) or ethylene glycol (hereafter, this may be abbreviated as EG), and the monomers are reused, the foreign materials generate various decomposition gases (for example, hydrogen chloride gas etc.) and various decomposition products (for example, lower hydrocarbons etc.) in the courses of heating process and reaction process, or mixed materials themselves sometimes largely deteriorate the quality of the monomer (DMT) recovered by chemical reactions, or they melt and become solid in recovering apparatuses to damage machinery and tools.
Namely, although chemical recycling has an allowance of the mixing of impurities larger than that of material recycling, it is required to remove the impurities almost completely in pretreatment processes. Further, it is generally known that the PET polymer for bottles is manufactured by obtaining an oligomer through an ester interchange reaction or an esterification reaction of DMT or TA used as a starting material with EG followed by a polycondensation reaction which is carried out successively. In this case, the DMT or TA of the raw material should be highly purified, and the contents of impurities should be sufficiently little; and otherwise, the obtained PET polymer can not be used for PET bottles.
Due to the circumstances having above mentioned various restrictions, no process capable of recovering effective components from used PET bottles through a chemical PET recycling machine supplier and again obtaining a PET polymer usable for PET bottles has been reported. The object of the present invention is to solve the above-mentioned problems of the conventional technologies and to propose a process that, even from used PET bottles containing impurities, a pollution-free high-purity monomer (DMT) can be obtained, and a PET polymer suitable for PET bottles can be manufactured effectively from the high-purity DMT. source:townhallPET recycling machine
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