Process for producing light-weight oil from waste plastics conta

Chemistry of hydrocarbon compounds – Production of hydrocarbon mixture from refuse or vegetation – From synthetic resin or rubber

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585832, 585469, 585638, 585733, 208400, 201 25, 201 25, C07C 100

Patent

active

058410112

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD TO WHICH THE INVENTION BELONGS

The present invention relates to a process for producing light-weight oil having a high octane number at a high yield from waste plastics containing phthalic polyester and/or polyvinyl chloride, without producing a phthalic sublimate or a carbonaceous residue, by pyrolyzing the waste plastics containing phthalic polyester and/or polyvinyl chloride.


PRIOR ART

It is known that the waste plastics are ordinarily composed mainly of polyolefinic plastics such as polyethylene and polypropylene, polystyrene, polyvinyl chloride or phthalic polyester. Various processes are proposed for producing light-weight oil having a high octane number of not less than 100, such as gasoline, at not less than 50 wt % with respect to the waste plastics as a part of the chemical recycling by breaking the above polyolefinic plastic into pieces, and effecting pyrolysis or catalytic cracking after dechlorination if necessary (For example, see JP-A-63 178195, JP-A-3 86790 and JP-A-86791).
However, if phthalic polyester and/or polyvinyl chloride containing a phthalic plasticizer is mixed in the waste plastics, there is a problem that a large amount of a phthalic sublimate and a carbon residue are produced during the pyrolysis, which cause a producing apparatus to be clogged. In order to solve this problem, it is necessary to preliminarily separate and remove the phthalic polyester and/or the polyvinyl chloride from the waste plastics, which causes a problem that the waste plastics-treating procedure becomes complicated.
On the other hand, as described in JP-A-6 220,463 and JP-A-7 82,569, there is a proposal that light-weight oil is produced from waste plastics containing polyvinyl chloride. The former publication has a problem that it is an indispensable requirement to use a material having an amide group, which raises costs and cannot be simply applied to the treatment of the waste plastics as municipal waste. Further, the latter case has a problem that since a phthalic sublimate produced during the pyrolysis is saponified, the yield of a product oil decreases.


PROBLEM TO BE SOLVED BY THE PRESENT INVENTION

The present invention is to solve the above-mentioned conventional problems, and has been accomplished to provide a process for producing light-weight oil from waste plastics containing phthalic polyester and/or polyvinyl chloride, which process can almost eliminate the production of a phthalic sublimate and a carbonaceous residue during a pyrolysis step and produce light-weight oil having a high octane number at a high yield even in the case of waste plastics containing phthalic polyester and/or polyvinyl chloride including a phthalic plasticizer.
The process for producing light-weight oil from waste plastics containing a phthalic polyester and/or a polyvinyl chloride according to the present invention has been accomplished to solve the above problems, and is characterized in that the light-weight oil is produced by pyrolyzing the waste plastics containing the phthalic polyester and/or the polyvinyl chloride in an atmosphere of steam or a mixture of steam and an inert gas.
Since almost none of the phthalic sublimate and the carbonaceous residue are produced in the pyrolysis step of the waste plastics containing phthalic polyester and/or polyvinyl chloride according to the present invention, a pipe line can be prevented from being clogged. Further, since the light-weight oil having a high octane number to be used as a raw material for obtaining gasoline and the like can be obtained at a high yield from the waste plastics, this enables the waste plastics to be recycled without being thrown away, and also enables effective utilization of resources.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a flow chart of a process for the production of light-weight oil from the waste plastics containing phthalic polyester and/or polyvinyl chloride according to the present invention, including a pyrolysis step.
FIG. 2 shows a flow chart of a process for the production of light-weight oil fro

REFERENCES:
patent: 4851601 (1989-07-01), Fukuda et al.
patent: 4982027 (1991-01-01), Korff et al.
patent: 5079385 (1992-01-01), Wu
patent: 5321174 (1994-06-01), Evans et al.
patent: 5364995 (1994-11-01), Kirkwood et al.
patent: 5639937 (1997-06-01), Hover et al.
7th Asian Pacific Confederation Chem. Eng., vol. 1, pp. 94-98 (1996).

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