Hazardous or toxic waste destruction or containment – Containment – Solidification – vitrification – or cementation
Patent
1994-06-20
1997-03-04
Straub, Gary P.
Hazardous or toxic waste destruction or containment
Containment
Solidification, vitrification, or cementation
585241, 201 25, 588213, 588216, C10B 5700, A62D 300
Patent
active
056081367
ABSTRACT:
Disclosed is a method and an apparatus for pyrolytically decomposing waste plastic, e.g. PVC, to recover light fuel oil. The invention enables to prevent the product from contamination by halogen compounds. The plastic is first thermally decomposed in an atmosphere of a normal or reduced pressure to produce a primary decomposition product in the form of gas and a decomposition residue. The primary decomposition product is cooled at a first cooling temperature to separate the primary decomposition product into a relatively light fraction containing a desired light constituent and a relatively heavy fraction by condensation of the relatively heavy fraction, and the relatively heavy fraction is then thermally decomposed in an atmosphere pressurized at a predetermined pressure to produce a secondary decomposition product containing the desired light constituent in the form of gas. The relatively light fraction and the secondary decomposition product are cooled at a second cooling temperature to condense a fraction containing the desired light constituent. This method may be changed so that the first and second thermal decomposition steps are performed at the same high pressure in one vessel and the heavy fraction is circulated. Additionally, alkali treatment of time plastic to be decomposed or the decomposition gas, thermal pretreatment of the plastic and addition of water or catalyst to the plastic can be used. The decomposition apparatus which is so systematized that the decomposition can be continuously performed is shown.
REFERENCES:
patent: 3829558 (1974-08-01), Banks et al.
patent: 4031192 (1977-06-01), Hafeli
patent: 5326919 (1994-07-01), Paisley et al.
Hayata Terunobu
Ito Isao
Kano Jiro
Maezawa Yukishige
Shimada Hideki
Hendrickson Stuart L.
Kabushiki Kaisha Toshiba
Straub Gary P.
LandOfFree
Method and apparatus for pyrolytically decomposing waste plastic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for pyrolytically decomposing waste plastic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for pyrolytically decomposing waste plastic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2147456