JP7457293B2 - Water remover - Google Patents

Description

Hydrochloric acid was mixed into the oil and water produced by pyrolysis of mixed waste polyvinyl chloride plastics without sorting, which hindered the reuse of the recovered oil.

Currently, the mixed PVC is visually sorted and removed, then crushed, and during the process of transporting the small pieces of waste plastic, the remaining small pieces of PVC are further blown away and removed through precision classification using compressed air. However, if a small piece of PVC is hidden behind a small piece of 3P waste plastic, it cannot be identified and removed.

The above methods are dry methods, and when processing large quantities, the waste plastics are roughly separated by hand, then crushed, and after the washing process, they are immersed in running water to separate the floating, light waste plastics from the sinking waste plastics, and other wet classification methods are used. Methods such as adding salt to the water are also used to improve the efficiency and accuracy of classification.

It is difficult to completely remove chloride from mixed waste plastic. The precipitate from wet classification is not reused but instead is disposed of in landfills or incinerated. If this mixed waste plastic is subjected to thermal decomposition treatment as it is, a large amount of chlorine will be mixed in the recovered oil, which will hinder its reuse as fuel. If fuel containing a lot of chlorine is used in burners, etc., equipment and equipment will corrode. It also emits odors and is difficult to purify into exhaust gas that meets emission standards.

It is impossible to completely separate them in the solid state. We are thinking about ways to process and reuse containers with residual liquid without having to sort or wash them. The raw material for plastic is a polymer made from naphtha produced during the refining of crude oil, so it is possible to turn waste into oil and reduce it to naphtha.

It is impossible to open and sort containers containing medical waste. If waste plastic can be liquefied through thermal decomposition without any sorting or cleaning, and the oil, water, and acid emulsified in the liquid can be separated, the path to reuse will be opened.

Patent No. 4961553

Method for evaluating oil-water separation of crude oil using a desalter tester Journal of the Petroleum Society 138-643 (1983)

General waste plastics generated by households are mixed with various types, including chloride-containing PVC products such as food containers, hot water buckets, and buckets, PVC-containing products such as industrial waste plastic acid-resistant products, and medical waste. When chloride, which is commonly found in dialysis tubes, is thermally decomposed, hydrochloric acid gets mixed into the oil and water, hindering reuse.

In addition to the problem of hydrochloric acid mixed into oil, there is also the problem of dust mixed into oil. A large amount of dust is generated when the temperature of the pyrolysis tank is 300°C to 350°C. The dust is carried out of the pyrolysis tank along with the generated gas and mixed in with the oil and water that are cooled and liquefied. In addition, the dust adhered to the inner walls of the device and hardened over time, making dust removal time-consuming and labor-intensive.

The generated dust mixes with hot oil, acid, and water, has a strong viscosity, and adheres to everything inside the equipment, hindering plant functionality. There is no way to prevent the generation of this dust.

After mixing the filtrate after dust removal, clean water is added, stirred and heated. This liquid is allowed to flow into the horizontally long container from one end, and the oil overflowing onto the top surface of the other end is taken out. Also, drain the water from below. Hydrochloric acid is collected in a knockout tank at the bottom of the tank.

The electrode is immersed in the liquid level of this oblong tank. Many sets of electrodes are arranged, each consisting of an anode and a cathode. Also, a box for electrical wiring and connection to these electrodes is installed on top of the tank. The tank has a circular cross-sectional shape and a horizontally long cylindrical shape. The electrodes are plate-shaped and located at the center of the left and right sides of this tank. Baffles are provided on the left and right sides of the electrode to limit the flow rate and equalize the residence time of the liquid in the tank. Further, since the liquid in the tank is dispersed by the baffle plate, the efficiency of electrophoresis of liquid molecules due to discharge from the electrodes is increased.

The power source used may be 200V or 100V, but single-phase 100V is economical as it consumes less power and has sufficient efficiency. Using this power source, the voltage is increased to 1000 V or more, and water particles that are emulsified and suspended in the liquid are charged. The charged water particles collect at the anode of the electrode, combine and scuttle into the liquid.

Hydrochloric acid is mixed into the oil and water. This is because the water containing chlorine emulsifies and the oil becomes more and more compatible, making it difficult to separate. By charging this oil and water mixture, only the water particles gather and bind together, sinking them into the liquid, making it possible to separate them by gravity.

FIG. 2 is an explanatory vertical cross-sectional view of the water remover placed horizontally. It is a vertical cross-sectional explanatory view of the water remover placed horizontally.

[Figure 1] is a vertical cross-sectional view of the water remover of the present invention seen from the side. 2. Insert the raw liquid inlet pipe into the tank from the cover on the end of the tank. By providing multiple holes in the tank part of the pipe, the inlet liquid can be dispersed and introduced into the tank.

The inflow stock solution passes through the tank through 3. The water flows in the direction of the oil overflow pipe, but as it moves through the tank, it touches the electrodes and reacts, causing the water to sink to the bottom, and the boundary between the oil and water becomes clear. The inflowing liquid is separated into oil and water in the tank, and the oil is separated into 3. From the oil spill pipe, the water is 8. The liquid is drained from the water outlet. 4. At the bottom of the center of the tank. There is a knockout, and hydrochloric acid accumulates here. 7 below the knockout. There is a salt drain valve that can be opened at any time to drain hydrochloric acid from the tank.

6. At the top of the tank. There is a group of electrodes. The material of the electrodes is non-magnetic, and the cathode and anode electrodes are alternately arranged. A large number of electrode plates, one each for yin and yang, are lined up and suspended from an electrode holder on the tank.

Using 100V as a power source, a voltage boosted to 10,000 to 30,000V is applied to the electrode group, causing a weak current to flow through the liquid inside the tank. The current value that flows varies depending on the water concentration of the liquid, the contact area of the immersed electrodes, and the distance between the electrodes, but it can be adjusted to appropriate voltage and current values by providing a variable resistor on the power source side. 5. Near the oil spill part in the tank. You can know the PH concentration by installing a PH concentration sensor.

The water remover should be made of SUS or PVC because the raw solution is acidic. Also, since the temperature of the stock solution becomes high, the material should be thicker. If the concentration of hydrochloric acid in the stock solution is higher than 20%, it may be neutralized with about 5% quicklime water.

It is possible to thermally decompose mixed waste plastics without sorting them and remove hydrochloric acid after liquefying them. It is also possible to reduce the hydrochloric acid concentration to 0.05% or less.

1. Horizontal tank 2. Stock solution inflow pipe 3. Oil spill pipe4. Knockout 5. PH concentration sensor6. Electrode group 7. Exhaust valve 8. Water outlet9. baffle board

Claims (2)

Water is added to a liquid mixture generated by pyrolysis of mixed waste plastics and medical waste, heat is applied and stirred, two or more pairs of electrode plates each consisting of an anode and a cathode are immersed in the liquid mixture, and the gap between the electrodes is By passing a small current with a voltage of 10,000 to 30,000 volts through the oil, the water containing the emulsified hydrochloric acid in the oil gathers, combines, and sinks to the bottom of the liquid. A water remover that removes hydrochloric acid from the bottom of a tank and removes water from the middle to separate the mixed liquid . The material of the water remover electrode according to claim 1 is a non-magnetic thin plate , and one set of these thin plates is used for the cathode and the anode , and these two plates are used as one plate. The electrode is used in a T-shaped state with the end face facing the flat part of the other plate , and about half of its length is immersed in the liquid , and the flow of the mixture of water, oil, and hydrochloric acid inside the tank is 2. The water remover according to claim 1, wherein the liquid is blocked by a baffle plate in the tank to suppress its flow rate, and is drained after being separated after an appropriate residence time in the tank.

Images