Chemistry of hydrocarbon compounds – Production of hydrocarbon mixture from refuse or vegetation – From synthetic resin or rubber
Patent
1997-08-15
1998-08-04
Yildirim, Bekir L.
Chemistry of hydrocarbon compounds
Production of hydrocarbon mixture from refuse or vegetation
From synthetic resin or rubber
585240, 208400, 201 13, 201 14, 201 15, 201 21, 201 22, 201 23, 201 24, 201 25, C10G 110, C10B 5500
Patent
active
057896364
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This application is on 371 of PLT/EP95/03901 filed on Oct. 2, 1995.
The invention concerns a method to obtain chemical raw materials and/or liquid fuel components from old or waste plastics and the use of a depolymerization product formed according to this method, in which the old or waste plastics are depolymerized at an elevated temperature, perhaps with the addition of a liquid auxiliary phase, a solvent, or a solvent mixture, with the gaseous and condensable depolymerization products (condensed product) and a sump phase (depolymerization product) formed, containing pumpable viscous depolymerization products, being removed in separate partial flows and with the condensed product and depolymerization product being worked up, separately from one another.
2. Description of the Background
Such a method is described in German Patent No. A-4,311,034.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a schematic embodiment of the present invention.
FIG. 2 illustrates a schematic similar to that of FIG. 1, except that the ascending sector is not formed by a pipe but rather a reactor segment which is separated from the rest of the reactor contents by a wall.
FIG. 3 illustrates a depolymerization unit of the present invention with two containers, which can be operated at different temperature levels.
FIG. 4 illustrates, as a section enlargement of FIG. 3, a T-shaped arrangement of the trap sector and branch.
FIG. 5 illustrates a process-technological alternative, in which a separation device is connected directly downstream of the trap sector.
FIG. 6 provides a graphical representation of distillate content versus resident time.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The products of the depolymerization are essentially subdivided into three main product flows: on the plastic mixture used and which, depending on the composition and the individual requirements, can be subdivided into partial product, flows conducted to the sump-phase hydrogenation, elevated-pressure gasification, low-temperature carbonization (pyrolysis), and/or other processes and uses.
They are mostly heavy hydrocarbons that boil around >480.degree. C. and all of which contain inert substances introduced into the process with the old and waste plastics, such as aluminum films, pigments, fillers, and glass fibers. wt %, based on the plastic mixture used, which boils in a range between 25.degree. C. and 520.degree. C. and can contain up to approximately 1000 ppm of organically bound chlorine.
The condensed product can be converted into a high-quality, synthetic raw oil (Syncrude), for example, by hydrotreating on stationary commercial Co--Mo or Ni--Mo catalysts, or also can be directly introduced into chlorine-tolerating, chemical-technical, or common refinery methods as a hydrocarbon-containing base substance. plastic mixture, which in addition to methane, ethane, propane, and butane can also contain gaseous hydrogen halides, such as mainly hydrogen chloride and readily volatile, chlorine-containing hydrocarbon compounds.
The hydrogen chloride can be scrubbed out, for example, with water from the gas flow to obtain a 30% aqueous hydrochloric acid solution. The residual gas can be freed of organically bound chlorine through hydrogenation in a sump-phase hydrogenation or in a hydrotreater and can be conducted, for example, to the refinery gas processing.
The method parameters are thereby selected in such a way that as high as possible a fraction of condensed product forms.
The individual product flows, in particular the condensed product, can be subsequently used in the course of its further processing in the sense of a raw-material recycling--for example, as raw materials for the olefin production in ethylene units.
An advantage of the method is to be found in the fact that inorganic secondary components of the old or waste plastics are concentrated in the sump phase, whereas the condensed product not containing these components can be further processed in less expensive
REFERENCES:
patent: 4243488 (1981-01-01), Sugimura et al.
patent: 5061363 (1991-10-01), Farcasiu et al.
patent: 5364996 (1994-11-01), Castagnoli et al.
Holighaus Rolf
Niemann Klaus
Strecker Claus
Veba Oel Ag
Yildirim Bekir L.
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