Primary Class: 585/241
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Method for catalytically cracking waste plastics and apparatus for catalytically cracking waste plastics
United States Patent Application 20070173673
Kind Code: A1
To provide a method for catalytically cracking waste plastics wherein the efficiency in decomposition is high; even polyethylene composed of linear chain molecules difficult in decomposition is decomposable at a low temperature and decomposed residue is hardly produced; the process is simple since dechlorination can be achieved at the same time with catalytically cracking waste plastics in one reaction vessel; and oil fractions can be recovered at 50% or more on a net yield basis. The method for catalytically cracking waste plastics of the present invention has a constitution in which waste plastics are loaded as a raw material into a granular FCC catalyst heated to a temperature range from 350° C. to 500° C. inside a reaction vessel, thereby decomposing and gasifying the waste plastics in contact with the FCC catalyst.
Inventors:
Fujimoto, Kaoru (Fukuoka, JP)
Li, Xiaohong (Fukuoka, JP)
Application Number: 11/588378
Publication Date: 07/26/2007
Filing Date: 10/27/2006
Assignee: Kitakyushu Foundation for the advancement of Industry, Science and Technology
Primary Class:585/241
Other Classes:422/198, 422/224
International Classes:C10G1/10; B01J8/10
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Download PDF 20070173673
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The FCC catalyst used is a solid acid catalyst based on synthetic zeolite which is granulated into granular particles of 40 to 80 µm used in the FCC (fluid catalyst cracking) process of petroleum. Since the FCC catalyst is substantially similar to waste plastics in mean specific gravity of 0.74 to 0.91, it can be mixed well with waste plastics inside a reaction vessel. Off-specification catalysts discharged from catalyst manufacturers and waste catalysts discharged from petroleum refinery plants may also be used. A mixture of these catalysts may also be used.
The waste catalyst is called FCC (U) (fluid catalyst cracking (used)) and obtained by regenerating catalysts used in fluid catalytic cracking for selectively catalytically cracking a wide variety of petroleum fractions covering light oil to normal pressure residue. It is also called an equivalent catalyst or regenerated catalyst. In petroleum refining plants, the catalyst is recycled between a catalytic cracking area and a regeneration area. A new catalyst is constantly supplied in a predetermined quantity to offset catalytic deterioration.
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