Waste Polystyrene

Journal of Applied Polymer Science 73,No.7, 15thAug.l999, p.1139-43 MECHANISM STUDIES ON THE CATALYTIC DEGRADATION OF WASTE POLYSTYRENE INTO STYRENE IN THE PRESENCE OF METAL POWDERS... 

In the present study, the pyrolysis of a waste polystyrene plastic (PSP) has beat investigated in a swirling fluidized-bed reactor to develop an effective reactor. Effects of the reaction time, temperature, ratio of the swirling gas and the gas velocity on the yields of an oil and a styrene monomer have been discussed. 

The waste polystyrene plastic (PSP) was melted at 250°C prior to being injected into the reactor, to create particles with a mean diameter of 2 mm. About fifty grams of feed material (waste PSP) was fed into the reactor at a given operating condition. The oil product or styrene monomer was obtained... 

The styrene monomer first may be polymerized to about 65% conversion in the absence of water, and then the blowing agent (cyclopentane) may be added with additional peroxide. This solution is suspended in water in the presence of potato starch, and the polymerization is finished (74). By another modification a styrene solution of waste polystyrene and peroxide is suspended by poly (vinyl alcohol) in water, and pentane is added to the suspension after the solids content of the oil phase is greater than 70% (133). Polystyrene particles may also be suspended in water by a mixture of poly (vinyl alcohol) and a phenyl sulfonate and then a mixture of equal parts of pentane and catalyzed styrene (8% each on polymer) is diffused into the polymer. The temperature is elevated, and the polymerization is completed (23). 

X. Guoxi, L. Rni, T. Qinhu, and L. Jinghua, Mechanism stndies on the catalytic degradation of waste polystyrene in the presence of metal powders, J. Appl. Polym. Sci, 73, 1139-1143 (1999). 

Z. Zhang, T. Hirose, S. Nishio, Y. Morioka, N. Azuma, A. Ueno, H. Ohkita, and M. Okada, Chemical recycling of waste polystyrene into styrene over solid acids and bases, Ind. Eng. Chem. Res. 34, 4514 (1995). 

In this study [25], waste polystyrene was flash pyrolyzed in a free-fall reactor under vacuum with the aim to assess the effects of both the operating temperature and the feed particle size on the kinds and relative distributions of products. 

Guoxi Xi, Rui Liang, Qinghu Tang, et al.. The study on the Catalysts selection and optimum condition of the degradation of waste polystyrene. Research of Environmental Sciences, 12(3), 60-61 (1999). 

Lilac, W.D. Lee, S. Kinetics and mechanisms of styrene monomer recovery from waste polystyrene by supercritical water partial oxidation. Adv. Envi. Res. 2001, 6, 9-16. 

Abstract The article is focused on the observation of usable possibilities of waste polystyrene that is created during foundry production and that could be used for production of cellular construction material. Thanks to its granulometry this kind of waste polystyrene is very suitable for use in the fine-soft Polymer-Modified Mortars (PMM), for example in the paste and gluing materials determined for ETICS (External Thermal Insulation Composite Systems). The mixtures for waste polystyrene application feature the required cellular light property, they conform to the requirements on the solidity and adhesiveness and conform also to the tension tests for the reinforcing layer. 

Based on excellent results during the waste polystyrene application into the polystyrene concrete and heat insulating coatings, a check of its suitability for the PMM production was carried out. 

To use waste polystyrene for the screeding and adhesive materials production for ETICS (with the maximum volume weight of 1500 kg.m ). 

To check the possibility of dispergator use to simplify the preparation of screeding and adhesive materials containing waste polystyrene as a filling component. 

To check the possibility of a simultaneous application of the waste polystyrene and fly ash in the monitored values. 

Table 3 Properties of mixtures with waste polystyrene.

According to expectations, the volume weight was reduced and the related pull and push pressure was reduced, however, very positive results were found in the rest. E/FA2 was selected as the most suitable mixture, showing the required lightening and fulfilling the set parameters, hence additional tests were carried out and the mixture was compared with the reference mixture, i.e. the mixture without waste polystyrene, see table 4 and 5. 

Figure 4 Photos from REM of E/FA2 mixture containing waste polystyrene and fly ash as filling component, a) magnification of 50 times and b) magnification 3000 times.

Figure 5 Determination of strength according to CSNEN 12808-3 mixtures with waste polystyrene, fly ash and dispersant agents.

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A solution of waste polystyrene (30-80 wt%) in toluene, xylene or dichloro-... 

Lee, K.H., 2008. Composition of aromatic products in the catal3dic degradation of the mixture of waste polystyrene and high-density polyethylene using spent FCC catalyst. Polymer Degradation and Stability 93 (7), 1284—1289. 

Preparation of flocculent from waste polystyrene Using ground water as source for industrial water and agriculture Preparation of polymer for solar cell application Preparation of conductive polymer... 

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