JPS6014066B2 - Method for separating light oil from waste tire oil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention deals with the treatment of carbon compound particles (hereinafter referred to as carbon) having a bad odor, paraffin wax, etc. in oil obtained by melting and thermally decomposing waste tires (hereinafter referred to as waste tire oil). This invention relates to a method for refining waste tire oil to remove impurities and unnecessary components to obtain light oil with high purity that can withstand reuse.

With the recent increase in the number of automobiles, a large amount of scrap tire waste has flooded in, and the means for disposing of it has become a problem as a pollution control measure.

As a treatment method, efforts have been made to extract waste tire oil by melting and thermal decomposition and reusing it as a resource, but the oil contains a large amount of carbon and cannot be reused even with centrifuges, filter presses, etc. I couldn't get enough oil to withstand it. In other words, even if mechanical separation is attempted, micron-shaped carbon dissolves in oil in an emulsion state, and it is thought that the carbon is not composed only of carbon but also contains a large amount of tire particles, and when used as an energy source. It produces black smoke and a characteristic odor, causing air pollution.

Not only that, but the phenomenon of burner chip clogging and chlorine in tire components can damage boiler tubes and the like, significantly shortening the life of the boiler itself. Furthermore, waste tire oil contains 10 to 20% paraffin wax, and when used without dewaxing, it has an extremely high viscosity index, which poses a major problem in its use. In order to solve this problem, the present invention has conducted extensive research and found that inorganic acid esters have a great effect on separating carbon, and in particular, nitroglycerin (nitrate ester of glycerin) has a great effect, leading to the present invention. It is something that

That is, the present invention separates and refines the unnecessary components, mainly carbon and paraffin wax, remaining in waste tire oil, and the active component, which is siliceous oil. It is extracted from the bottom of the distillation column as asphalt-like residual oil.
After removing paraffin wax during the process of cooling the distillate from the top, the objective is to recover light oil equivalent to high-quality kerosene and diesel oil. The present invention will be explained below based on examples.

Waste tire oil is composed of approximately 40% carbon, paraffin wax, and 10 to 20% remaining oil equivalent to kerosene or light oil, and is very different from general crude oil. As shown in FIG. 1, such waste tire oil is stored in a service tank 1, pumped by a pump 2, and sent to a vacuum distillation column 3. As shown in FIG. 2, the vacuum distillation column 3 is flooded with 85 to 200 qo of boiler waste hot water or steam using a coil 4 and jacket 5, or if a heat source is not available, a heating can 6. On the other hand, the vacuum pump 7 maintains the reduced pressure in the tether at 100 to 40 mon, but of course an ejector may be used instead of the vacuum pump. Then, by adding a nitroglycerin solution as a chemical dosing agent from the chemical dosing line 8 and then performing vacuum distillation, separation and sedimentation of carbon is promoted, and the carbon is aggregated in the vacuum residual oil and discharged from the system. It becomes possible to take it out easily.
Although it is effective to add nitroglycerin to the initial service tank 1, it takes a long time and a greater effect can be achieved by performing distillation under reduced pressure.

In addition, vacuum distillation lowers the boiling point and suppresses deterioration of quality due to thermal decomposition and decrease in the yield of recovered pore oil.In addition, since the vacuum distillation temperature is low, high-temperature corrosion can be avoided and corrosion prevention is achieved. There are also expectations for synergies.
In addition to sulfate esters, inorganic acid esters such as nitrite esters can be considered as other medicinal agents, but nitroglycerin is highly effective. Steady operation is monitored in the vacuum distillation column by a pressure gauge 9, a thermometer 10, and a liquid level gauge 11. Waste tire oil with a low boiling point passes through an eliminator 12 under vacuum distillation, and oil equivalent to kerosene oil is sent to the column. On the other hand, oil corresponding to the light oil crab fraction is led from the hood 13 to the nozzle 14 to the next step.

Since these distillate oils contain paraffin wax and have the same boiling point as the light oil, they cannot be separated by distillation, but can be separated during the process of passing through the heat exchangers 16 and 17.

As shown in FIG. 3, using the refrigerator 18, the Naoiso coil 19
As the crab oil passes through the heat exchanger tube 20 through the heat exchangers 16 and 17 which are cooled to -7 to 1 lyo, it is indirectly rapidly cooled and the paraffin wax is applied to the inner surface of the tube.

In this way, the crab oil from the top nozzle 15 passes through the heat exchanger 16 and the paraffin wax is removed, and then is collected as kerosene in the receiver tank 21, while the oil from the nozzle 14
The oil from the tank passes through a heat exchanger 17 and is collected as light oil in a receiver tank 22 after removing paraffin wax. Next, the paraffin wax formed on the inner surface of the heat exchanger tube 20 can be easily discharged from the system through the outlet 23 by stopping the cooling by the direct expansion coil 19 after the waste tire oil processing operation and flooding the heat exchangers 16 and 17. . In this example, waste tire oil was separated into kerosene, diesel oil, paraffin wax, and can residual oil.
Of course, it is also possible to remove the kerosene and extract it from the head section of the vacuum distillation column by combining it with a single slurry and extracting it as refined oil without separating kerosene and light oil. In such a situation, it is possible to process with one heat exchanger, but by arranging two heat exchangers and running the discharge of paraffin wax in batches with a complete change of timer, continuous operation of waste tire oil in the vacuum distillation column can also be carried out.

As described above, the present invention removes carbon and paraffin wax from waste tire oil and recovers highly purified refined oil that can be reused, thus solving the conventional method of processing waste tire oil that is simply obtained. However, by providing a light oil that is sufficiently durable for use in boilers, diesel engines, etc., it is highly effective in terms of resource reuse.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a flow sheet of an embodiment of the present invention, FIG. 2 is a schematic sectional view of a vacuum distillation column, and FIG. 3 is a schematic sectional view of a heat exchanger. It is a diagram. 1... Service tank, 2... Pump, 3... Vacuum distillation column, 7... Vacuum pump, 8... Drug column line, 16, 17... Heat exchanger, 18. ...Refrigerating machine, 21...Receiver tank. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. Heat the waste tire oil to 400 Torr or less and 200°C.
Vacuum distillation is carried out under the following conditions, nitroglycerin is added to the waste tire oil under the vacuum distillation, carbon compound particles having a bad odor are precipitated and removed, and then the distillate obtained by distillation is passed through a heat exchanger, A method for separating light oil from waste tire oil, the method comprising removing paraffin wax contained in the distillate oil.