Monomeric recovery from polymeric materials

Details Monomeric recovery from polymeric materials Monomeric recovery from polymeric materials

1990-08-23

1992-08-04

Pal, Asok

Chemistry of hydrocarbon compounds

Production of hydrocarbon mixture from refuse or vegetation

From synthetic resin or rubber

505648, C07C 422

Patent

active

051361175

ABSTRACT:
A method is described for the recovery of high yields of monomers from waste and scrape polymeric materials with minimal amounts of char and tar. The process involves pyrolysis in a circulating fluid bed (CFB). The polymer is heated to a temperature of about 650.degree.C. to about 1000.degree.C. at a rate of more than 500.degree.C./sec in less than two seconds. Heat is supplied to the CFB by a stream of hot sand heated in a separate combustor. The sand is also used as the circulating fluid bed material of the CFB. The process is essentially devoid of solid carbon char and non-monomeric liquid products.

REFERENCES:
patent: 3901951 (1975-07-01), Nishizaki
patent: 4584421 (1986-04-01), Saito et al.
R. G. Graham et al., Fast Pyrolysis (ultrapyrolysis) of Biomass Using Solid Heat Carriers in Fundamentals of Thermochemical Biomass Conversion edited by Overend et al. p. 397.
D. C. Scott et al., Past Pyrolysis of Waste Plastics, Energy from Biomass and Wastes XIV; Lake Buena Vista, Fla., Jan. 29, 1990.
W. Kaminsky, Thermal Recycling of Polymers, Journal of Analytical and Applied Pyrolysis, 1985, vol. 8, pp. 439-448.
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T. Sawaguchi et al., Studies on the Thermal Degradation of Synthetic Polymers--Thermal Gasification of Polyolefins, Bulletin of the Japan Petroleum Institute, 1977, No. 2, pp. 124-230.
T. Kuroki et al., Pyrolysis of Polystyrene--Prediction of Product Yields, Nippon Kagaku Kaishi, 1976, No. 11, pp. 1766-1772. Translation Provided.
T. Kuroki et al., Thermal Gasification of Polypropylene, Nippon Kagaku Kaishi, 1976, No. 2, pp. 322-327.
T. Sawaguchi et al., Thermal Gasification of Polyethylene--Prediction of Product Yield, Nippon Kagaku Kaishi, 1977, No. 4, pp. 565-569.

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