Chemistry of hydrocarbon compounds – Production of hydrocarbon mixture from refuse or vegetation – From synthetic resin or rubber
Reexamination Certificate
1999-03-15
2001-07-03
Yildirim, Bekir L. (Department: 1764)
Chemistry of hydrocarbon compounds
Production of hydrocarbon mixture from refuse or vegetation
From synthetic resin or rubber
C201S002500, C201S025000
Reexamination Certificate
active
06255547
ABSTRACT:
FIELD OF THE INVENTION
A subject of the invention is the method of obtaining liquid fuels from polyolefine wastes.
BACKGROUND OF THE INVENTION
Heretofore from the Polish patent description no. 149887 there is known a method of obtaining liquid fuels from atactic polypropylene, according to which raw material is subjected to a thermodegradation process at temperatures between 180° C. to 340° C., introducing air into a reaction system. During the process according to the known method the fractionated reception and condensation of products are kept.
European patent application no. 0577279 A1 teaches a method of polymer processing, which is based on thermal decomposition of polyolefines, poly/vinyl chloride/ and poly/ethylene terephtalate/ at temperatures from 300°C. to 600° C. in a stream of a hot gas free of oxygen. The process runs in the presence of a catalyst in a form of zeolytic clay, amorphic aluminium silicate, silica, quartz, aluminium, zirconium, ash and calcium oxide.
In the above method, the use of a fluidized reactor is necessary. The resultant products are characterised in a broad range of a molecular weight distribution.
U.S. Pat. No. 4,584,421 teaches a method of decomposition of polyolefines wastes, based on heating a melted reaction mass up to temperatures between 440°C.-470° C. in the presence of catalyst. In the mentioned temperatures volatile products are obtained, which are consequently introduced into a catalyst bed of a temperature between 350° C.-470° C., after which hydrocarbons of a narrow range of molecular weight are formed.
The catalyst belongs to the group of compounds, comprising ferrous-aluminium oxide complex, silicic acid-ferrous oxide complex and zeolites. The products, obtained according to the known methods have a broad range of molecular weights.
SUMMARY OF THE INVENTION
A method according to the invention bases on heating the disintegrated polyolefin wastes at the temperatures between 180° C. to 620° C. in a presence of heavy metals silicates as catalyst, which are used in amounts from 1 to 30% by weight, calculating on the mass of polyolefin raw material. Particularly favourite run of the reaction occurs at the temperatures between 300° C. to 450° C., using as the catalysts silicates of iron Fe
3+
, cobalt Co
2+
, nickel Ni
2+
, manganium Mn
2+
, chromium Cr
3+
, copper Cu
2+
, cadmium Cd
2+
which process runs the most favourably with the amount of catalyst between 5 and 10%.
The applied catalyst, after use can be recycled and reused in the process according to the invention.
The process lead according to the invention can be run in a periodic or continous way, and the raw material comprises used and waste polyethylene polypropylene, polyisobutylene, polystyrene, natural and synthetic rubber.
REFERENCES:
patent: 4542239 (1985-09-01), Lamparter et al.
patent: 4584421 (1986-04-01), Saito et al.
patent: 4982027 (1991-01-01), Korff et al.
patent: 196 29 042 (1996-07-01), None
patent: 0 577 279 (1999-01-01), None
patent: 149 887 (1990-06-01), None
Larson & Taylor PLC
Smuda Heinrich
Yildirim Bekir L.
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