A Study on Dechlorination of Chlorine Compound in Poly(vinylchloride)-Containing Mixed Plastics using Screw Reactors

Sang Guk Kim; Yeon Hwa Lee; Soo Hyun Chung

Journal of Industrial and Engineering Chemistry, Vol.9, No.3, 225-232, May, 2003

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A Study on Dechlorination of Chlorine Compound in Poly(vinylchloride)-Containing Mixed Plastics using Screw Reactors

Sang Guk Kim^†, Yeon Hwa Lee¹, and Soo Hyun Chung

Waste Pyrolysis Research Center, Korea Institute of Energy Research, Daejeon 305-343, Korea
¹Department of Environmental Engineering, Chonnam National University, Kwangju 500-757, Korea

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PVC is a versatile thermoplastic and one of the 5 most common plastics in Korea. Thermal degradation of PVC is a two stage process. The aim of this work is to investigate an effective method to remove chlorine component from tile PVC-containing mixed plastics prior to pyrolysis. Temperature, feed rate, PVC content in the mixed plastics, viscosity, and degree of mixing are chosen as experimental parameters. Chlorine removal rate increases with the increase in the temperature of screw reactors. Chlorine removal rate for the mixed plastics(PVC 8%, PP 60%, and LDPE 32%) attains to 96.8% when the temperatures of the first and second screw reactor are 270 ℃ and 320 ℃, respectively. It is shown that a linear relationship between the viscosity and the residual percentage of chlorine in product is approximately formed. Experimental results show that the reactor temperature and the viscosity of the mixed plastics are governing factors affecting chlorine removal rate. As a result, a screw reactor is found to be available as a pre-treatment process to remove chlorine component effectively before thermal pyrolysis.

Keywords:chlorine;dechlorination;screw reactor;PVC;plastics

[References]

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[Related Articles]

[1] Menges G, Pure Appl. Chem., 68(9), 1809 (1996)

[2] Marcilla A, Beltran M, Polym. Degrad. Stabil., 48, 219 (1995)

[3] Kim S, Waste Manage., 21, 609 (2001)

[4] Miranda R, Yang J, Roy C, Vasile C, Polym. Degrad. Stabil., 64, 127 (1999)

[5] Bockhorn H, Hornung A, Hornung U, J. Anal. Appl. Pyrolysis, 50, 77 (1999)

[6] Bockhorn H, Hornung A, Hornung U, Jakobstroer P, J. Anal. Appl. Pyrolysis, 49, 97 (1999)

[7] Sakata Y, Uddin MA, Koizumi K, Murata K, Polym. Degrad. Stabil., 53, 111 (1996)

[8] Manzoor W, Yousaf SM, Ahmad Z, Polym. Degrad. Stabil., 51, 295 (1996)

[9] Lingaiah N, Uddin MA, Muto A, Sakata Y, Imai T, Murata K, Appl. Catal. A: Gen., 207(1-2), 79 (2001)

[10] Horikawa S, Takai Y, Ukei H, Azuma N, Ueno A, J. Anal. Appl. Pyrolysis, 51, 167 (1999)

[11] Sung JH, Hyun YH, Kwon DH, Choi HJ, J. Ind. Eng. Chem., 8(1), 28 (2002)