JP2003253038A - Method and apparatus for removing chlorine from heat decomposition product of resin-containing waste - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method, and the like, for effectively removing chlorine from the heat decomposition product of a resin-containing waste. <P>SOLUTION: The method for removing chlorine from the heat decomposition product of the resin-containing waste comprises mixing an oily heat decomposition product formed from the heat decomposition of the resin-containing waste and being in a liquid state with hot washing water to transfer chlorine components such as inorganic chlorine and inorganic chlorides to the water phase; removing the water phase from the system; and recovering the liquid decomposition product in an oil phase left after removing the water phase. Desirably, the feed systems for the heat decomposition product and for the hot washing water are kept at 150-200°C and at 7-20 atm., to mix the former with the latter while the former is kept in a liquid state. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a chlorine removing method and a chlorine removing apparatus for easily and efficiently removing inorganic chlorine and inorganic chloride remaining in a thermal decomposition product of resin-containing waste such as plastics and shredder dust. It relates to a desalted cracked oil and a desalinated solid fuel obtained by this desalination method.

[0002]

2. Description of the Related Art As a desalting method for decomposing waste plastics, conventionally, when the waste plastics are thermally decomposed, chlorine contained is decomposed and volatilized and removed. Chlorine contained in chlorine-containing plastics such as PVC is released as hydrogen chloride gas when heated to about 250 ° C or higher, but when inorganic substances such as calcium, sodium, lead, zinc, and aluminum are present in waste plastics, thermal decomposition occurs. A part of the hydrogen chloride generated in the reaction reacts with these inorganic substances to form a chloride, which fixes chlorine, which makes desalting difficult.

Many plastics contain additives such as inorganic compounds in order to enhance coloring, antistatic properties, abrasion resistance, flame retardancy, enhancing properties, softening properties and dripproofing properties. Further, a plastic product integrally molded with a metal material may be difficult to separate from the metal material. Further, there are resin-containing wastes, such as shredder dust, in which metal scraps and resin scraps such as vinyl chloride are mixed. When such waste is pyrolyzed, a part of hydrogen chloride reacts with inorganic substances to form chloride, which remains in the decomposed product, causing corrosion and environmental pollution when reusing this decomposed product. become. The amount of residual chlorine varies depending on the amount of coexisting inorganic components, but generally there is a considerable amount of inorganic components, so it is difficult to effectively remove chlorine.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems in a conventional desalination method for decomposition treatment of resin-containing waste, and is a liquid decomposition product produced by thermal decomposition of resin-containing waste. Provided are a desalination method for easily and efficiently removing the inorganic chlorine component remaining in, a desalted cracked oil and a desalted solid fuel obtained by this desalination method, and a desalination apparatus.

[0005]

According to the present invention, there are provided the following chlorine removal method, and a desalted cracked oil and desalted solid material obtained by this desalination method. (1) An oily thermal decomposition product produced by thermal decomposition of a resin-containing waste is mixed in liquid form with hot wash water to transfer chlorine components such as inorganic chlorine or inorganic chloride contained in the thermal decomposition product to an aqueous phase. A method for removing chlorine from a thermal decomposition product of a resin-containing waste, characterized in that the liquid decomposition product of an oil phase separated from an aqueous phase is recovered by removing it outside the system. (2) In the chlorine removal method of (1) above, the supply system of the thermal decomposition product and the thermal cleaning water is maintained at 150 ° C to 200 ° C and 7 to 20 atm, and the thermal decomposition product is thermally cleaned in a liquid state. A method for removing chlorine, which comprises mixing with water to transfer a chlorine content contained in the thermal decomposition product to an aqueous phase and removing the chlorine out of the system. (3) In the chlorine removal method of (1) or (2) above, the hot wash water separated from the oil phase is withdrawn, the chloride in the liquid is removed, and then used again for removing the chlorine of the thermal decomposition product. (4) In the chlorine removal method of (1), (2), or (3) above, the chlorine component contained is decomposed and volatilized by thermally decomposing the resin-containing waste in oil, and the light organic component is volatilized. A method in which the cracked oil recovered by suppressing the above is used as the thermal decomposition product. (5) In the chlorine removal method of the above (4), chlorine contained in the resin-containing waste is controlled by controlling the thermal decomposition with the density of the molten oil or the decomposed oil generated by the thermal decomposition of the resin-containing waste as an index. It goes through a melting and cracking process that decomposes and volatilizes and removes the components and obtains a molten liquid oil that suppresses volatilization of light organic components, and a reforming adjustment process that further thermally decomposes the molten liquid oil and reforms it into cracked oil. A method for removing chlorine using the cracked oil recovered as a thermal decomposition product. (6) Desalted cracked oil having a chlorine content of 0.1 wt% or less obtained by the chlorine removal method of (4) above. (7) A solid fuel having a chlorine content of 0.1 wt% or less and a pencil hardness of 3B or less obtained by cooling and solidifying the desalted cracked oil obtained by the chlorine removal method of (4) above.

Further, according to the present invention, the following chlorine removing device is provided. (8) Desalting section for mixing liquid thermal decomposition product (decomposed oil) obtained by thermal decomposition of resin-containing waste and thermal cleaning water, and pipe for supplying the thermal decomposition product and thermal cleaning water to the desalting section Passage, heat exchanging means and pressurizing means provided in the supply pipeline, pipeline for extracting cracked oil from the desalting section, circulation tube for extracting a water phase from the desalting section and guiding it to the supply pipeline for hot wash water Device for removing chlorine from a thermal decomposition product of a resin-containing waste, characterized in that it has a passage, a cooler for cooling hot cleaning water in the circulation pipe, and a means for removing inorganic chloride from the cooled cleaning water. . (9) The chlorine removing device according to the above (8), in which the desalting section is formed by a mixing tank equipped with a stirrer and a phase separation promoting section. (10) In the chlorine removal device of (8) above, the demineralization part is formed by a tubular mixer and a separation tank that stores the mixed liquid introduced from the mixer and separates it into an oil phase and an aqueous phase. Chlorine removal equipment. (11) In the chlorine removal device of (8) above, the desalting section is formed by a mixing tank equipped with a stirrer and a centrifugal decanter for separating the mixed liquid introduced from the mixing tank into an oil phase and an aqueous phase. Chlorine removal equipment.

The chlorine removal method of the present invention is a method in which a thermal decomposition product of a resin-containing waste is supplied under heating and under pressure to be mixed with hot washing water in a liquid state, and chlorine content contained in the thermal decomposition product is mixed with an aqueous phase. It is possible to recover cracked oil having a very low chlorine content since it is removed to the outside of the system after being transferred to. Moreover, since the heat of the cracked oil can be used, the heating cost is low, the cost is low, and the economy is excellent. Further, since the decomposed oil is mixed in a liquid state, a large amount of treatment is possible and the efficiency is high. Furthermore, since the wash water is circulated and reused, the burden of wastewater treatment is small.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below based on Examples. [Desalination Method] The chlorine removal method of the present invention is a method in which a thermal decomposition product generated by thermal decomposition of a resin-containing waste is mixed with hot washing water in a liquid state to contain inorganic chlorine or inorganic chloride contained in the thermal decomposition product. The chlorine content is transferred to the water phase and removed to the outside of the system, and the liquid decomposition product of the oil phase separated from the water phase is recovered. Further, according to the present method, inorganic halogen or inorganic halide other than chlorine contained in the thermal decomposition product can be similarly removed. In the present invention, the resin-containing waste refers to, for example, various plastics such as PVC, PET, acrylic, polyacrylate, polypropylene and polycarbonate, other resin, synthetic fibers, urethane and other resin-based waste. In addition, it also includes wastes such as shredder dust in which resin components and inorganic components such as metal scraps are mixed.

As the thermal decomposition product to be treated in the present invention, for example, when the resin-containing waste such as waste plastic is thermally decomposed in oil, the chlorine content is decomposed and volatilized, and the light organic component is contained as much as possible. The cracked oil recovered without being volatilized can be used. Specifically, this decomposed oil uses the density of the molten liquid oil generated by thermal decomposition as an index, preferably the density and viscosity as an index, and pyrolyzes the waste by volatilizing and removing the contained chlorine and organic volatile components. It can be obtained through a melt cracking step of forming a molten liquid oil in which the generation of the above is suppressed, and a reforming adjusting step of further thermally decomposing the molten liquid oil to reform into a cracked oil.

In the thermal decomposition of the above waste, the densities of the molten oil and the decomposed oil are 300 kg / m ³ or more and 700 kg / m ³ or less when the melt decomposition step and the reforming adjustment step are performed in one step. When performing the melt cracking process and the reforming adjustment process in two stages, the density of the molten liquid oil should be 400 kg / m ³ or more to 700 kg / m ³ or less in the first stage pyrolysis process, and the second stage modification preferably, to control the density of the cracked oil 300 kg / m ³ or more ~600kg / m ³ below in the quality adjustment process.

When the viscosity is controlled together with the density, the viscosity of the molten oil is 300 c.
It is preferable to control to p or less. In the two-step treatment, the viscosity of the melt oil in the melt cracking process may be controlled to 600 c.p or less, and the viscosity of the cracked oil in the reforming adjustment process may be controlled to 300 c.p or less.

The cracked oil produced by the above-mentioned thermal decomposition has low density and viscosity at the processing temperature of thermal cracking and has excellent fluidity, but the fluidity decreases at room temperature and atmospheric pressure, and solidifies when cooled. . In order to mix it with the hot wash water in liquid form, it is preferable to maintain the oil temperature so that the cracked oil does not cool below a certain temperature, and preferably supply under pressure. Specifically, for example, the temperature is maintained at 150 ° C or higher and 200 ° C or lower, preferably 160 ° C or higher and 180 ° C or lower, and adjusted to 7 atm to 20 atm, preferably 7 atm to 10 atm. When the temperature is lower than 150 ° C., the viscosity of cracked oil increases and the fluidity deteriorates. Further, when the temperature exceeds 200 ° C., the pressure of the system must be considerably increased in order to maintain the washing water in a liquid state, which is disadvantageous in the construction of the apparatus. Supply system is 20
When the pressure is higher than atmospheric pressure, the same is true. On the other hand, when the pressure is lower than 7 atmospheric pressure, the washing water becomes vapor and liquid-liquid mixing with cracked oil is impossible.

The thermally decomposed product (decomposed oil) of the above waste in liquid form is thoroughly mixed with hot wash water. As mentioned above, when inorganic substances such as alkali metals, alkaline earth metals, lead, and zinc are mixed in the resin-containing waste, a part of hydrogen chloride generated by thermal decomposition of the resin component reacts with the inorganic substances to form chlorides. Formed,
Remains in cracked oil. Since these alkali metal chlorides, alkaline earth metal chlorides, lead chloride and zinc chloride are dissolved in hot water, these chlorides can be dissolved in hot wash water by mixing with hot wash water at the above temperature. Phase shifts and removal from cracked oil. The oil / water ratio of this mixed system may be about 0.5 to 2.0.

After mixing, an oil phase and an aqueous phase are separated. The mixing means and the separating means may be carried out in the same tank or separately. Specifically, as a device in which mixing and separation are performed in the same tank, a vertical tank equipped with a stirrer and a phase separation promoting means can be used. Further, as a device for performing mixing and phase separation separately, a tubular mixer without a stirrer and a vertical storage tank for phase separation, or a stirrer provided with a centrifugal decanter, etc. Can be used.

After the cracked oil and hot wash water are mixed, the separated aqueous phase is withdrawn and cooled, chlorides in the liquid are removed from the system by ion exchange, etc., and then water is replenished as necessary,
It is advisable to adjust the temperature and pressure to the above and return them to the supply system, and use again for desalting the cracked oil.

According to the above desalting method, the chlorine content is 0.1 wt.
% Or less of desalted cracked oil can be obtained. Further, the cracked oil recovered from the oil phase has a low viscosity, and when cooled and solidified, a solid material having good grindability can be obtained. Specifically, a solid material having a chlorine content of 0.1 wt% or less and a pencil hardness of 3B or less can be obtained. This solid is the best solid fuel.

[Desalination Device] FIGS. 1 to 3 show an example of a device configuration for carrying out the above chlorine removal method. The chlorine removing apparatus of the present invention shown in FIG. 1 is a desalting section 1 for mixing an oily thermal decomposition product (decomposed oil) obtained by thermal decomposition of a resin-containing waste with hot cleaning water.
0, a pipe line 11 for supplying the thermal decomposition product and hot wash water to the desalination unit 10, a heat exchange unit 12 and a pressure unit 13 provided in the supply pipe line 11, and a cracked oil is extracted from the desalination unit 10. Pipe line 14, circulation line 15 for extracting the water phase from the desalting section 10 to supply line 19 for hot wash water, cooler 17 for cooling the hot wash water in the circulation line 15, cooled wash water Means 16 for removing inorganic chloride from the.

The desalting section 10 of the apparatus configuration shown in FIG. 1 is formed by a vertical mixing tank 20 equipped with a stirrer 21 and a phase separation promoting section 22. The phase separation promoting portion 22 may be formed of a hydrophilic material or a lipophilic material and a baffle plate,
The mixing tank 20 is arranged above and below so as to partition the central portion. The mixed liquid of the cracked oil and the hot wash water introduced into the central portion of the mixing tank is guided along the phase separation promoting section 22 so as to be separated into an upper oil phase and a lower aqueous phase, and the separated oil phase Mixing of the aqueous phases is prevented. The oil phase separated to the upper side is withdrawn through the pipe line 14 at the top of the tank, and the lower aqueous phase is withdrawn through the pipe line 15 at the bottom of the tank.

The demineralization section of the apparatus structure shown in FIG. 2 is a tubular mixer 30 without a stirrer, and a vertical type separator for storing the mixed liquid introduced from this mixer 30 and separating it into an oil phase and an aqueous phase. Tank 31
Is formed by. The mixer 30 is provided in the supply line 11 for the cracked oil and the hot wash water, and the cracked oil and the hot wash water are mixed while passing through the mixer 30. This mixed liquid is guided to the central portion of the separation tank 31 and separated into an upper oil phase and a lower water phase. The oil phase separated to the upper side is withdrawn through the pipe line 14 at the top of the tank, and the lower aqueous phase is withdrawn through the pipe line 15 at the bottom of the tank. Note that the separation tank 31 may be provided with the phase separation promoting unit 22.

The desalting section of the apparatus configuration shown in FIG.
And a centrifugal decanter 34 for separating the mixed liquid introduced from the mixing tank 33 into an oil phase and an aqueous phase. Decomposed oil and hot wash water are supplied to the supply line 11
Is introduced into the mixing tank 33 through and mixed with stirring, and then the mixed liquid is guided to the decanter 34, and separated into an oil phase and an aqueous phase by centrifugal separation. Oil phase and water phase are each pipeline 1
It is extracted through 4 and 15.

In the apparatus example of FIGS. 1 to 3, the circulation line 1
The chlorine removing means 16 provided in 5 is an ion exchange resin,
It can be formed of activated carbon, a separation membrane or the like. In addition, a replenishment section 18 for replenishing the cleaning water as needed is provided in the circulation line 15. The water phase separated from the oil phase is cooled via a heat exchanger 17, reduced in pressure, and then introduced into a chlorine removing means 16 equipped with an ion exchange resin, activated carbon, a separation membrane, etc., where inorganic chlorine in water is removed. Is removed from the system. Then, the water is pressurized and heated by the pressurizing pump 13 and the heat exchanger 12, and then sent to the desalting section 10 through the supply pipe lines 11 and 19 to be reused. The ratio of the amount of circulating water to the cracked oil may be about 0.1 to 1.0, and when the amount of water is insufficient, the water is supplied in the water tank 18.

As the thermal decomposition device for the resin-containing waste, the one shown in FIG. 4 or 5 can be used. The apparatus configuration example of FIG. 4 is an example in which the melt decomposition step and the reforming adjustment step are performed in one stage. The melt decomposition tank 40 and the pipeline 4 for extracting the decomposed oil
1. A pump 42, a filtration unit 43, and a heat exchanger 44 provided in the pipe line 41 are provided, and a density meter 45 and a viscometer 46 are attached to the melt decomposition tank 40. The waste plastic is thermally decomposed in oil in the melting and decomposition tank 40 to obtain a molten liquid oil, and the molten liquid oil is further reformed. The generated cracked oil is guided by the pump 42 to the filtering unit 43 through the pipe 41, where solid foreign matters such as metal and glass are removed, and then guided to the heat exchanger 44 to be cooled to a predetermined liquid temperature.

The apparatus configuration example of FIG. 5 is an example in which the thermal decomposition of the waste plastic by the melt decomposition tank 40 and the reforming of the molten liquid oil by the reforming adjustment tank 11 are performed in two stages. In addition to the apparatus configuration of FIG. A reforming adjustment tank 47 is provided between the filter 43 and the heat exchanger 44. The melted liquid oil generated in the melt cracking tank 40 is guided to the filtering section 43 to remove solid foreign matters such as metal and glass, and then sent to the reforming adjusting tank 47 to be reformed into cracked oil having low viscosity. This decomposed oil is guided to the cooler 44 and cooled to a predetermined liquid temperature. As another embodiment of the apparatus example shown in FIG. 5, the melting and decomposing tank 40 is provided with a conduit 41 for extracting the molten liquid oil and a conduit for extracting the decomposing oil, and the decomposing oil generated in the reforming adjusting tank 47 is melted and decomposed. A circulation system for returning to the tank 40 may be formed. Further, in these apparatus examples, the thermal decomposition and reforming of waste plastics are controlled by using the density and viscosity of the melt oil or cracked oil as an index.

The cracked oil produced by these thermal crackers is guided to the chlorine removing apparatus shown in FIGS. 1 to 3, and is kept in a liquid state under the heating and pressurization of the above liquid temperature and liquid pressure through the mixing section 10 through the supply line 11. Will be introduced to. The amount of cracked oil and hot wash water may be adjusted to an oil / water ratio of about 0.1 to about 1.0 through each supply line. The cracked oil and the hot wash water are mixed in the mixing section 10, and the inorganic chlorine component contained in the cracked oil is dissolved in the hot wash water and transferred to the aqueous phase to be removed from the cracked oil. This mixed liquid is separated into an oil phase and an aqueous phase, and the demineralized cracked oil is recovered through the pipe line 14. The hot wash water is withdrawn through the pipe line 15, cooled by the heat exchanger 17, the liquid pressure is released, and then introduced into the chlorine removing means 16, which is necessary after the chloride in the liquid is removed by ion exchange or the like. Water is supplied to the water tank 18 in accordance with
It is returned to 9 and used again for desalination as hot wash water.

[0025]

EXAMPLES Examples of the present invention will be shown below. [Examples and Comparative Examples] Waste plastic containing calcium carbonate and PVC was pyrolyzed by the pyrolysis treatment apparatus shown in Fig. 4, and the produced cracked oil was subjected to desalting treatment using the desalination apparatus shown in Fig. 1. . The results of this desalting treatment are shown in Table 1 together with the contents of calcium carbonate and PVC, the thermal decomposition temperature and the reaction (residence in the tank) time, and the desalting treatment temperature and pressure. Samples of Examples relating to the preferred processing conditions of the present invention (No.
No. 5), the chlorine concentration of cracked oil after desalination is 0.1 wt%
% Or less, but in the comparative samples (No. 6 to No. 10) that deviate from the preferred treatment conditions of the present invention, the chlorine concentration of the cracked oil after desalting is around 0.5 wt%, and the chlorine concentration is high.

[0026]

[Table 1]

[0027]

EFFECTS OF THE INVENTION The chlorine removal method of the present invention has an excellent desalting effect and can recover cracked oil having an extremely low chlorine content. Moreover, if the washing water is heated using the heat of the cracked oil obtained by thermal decomposition, the heating cost is low and it is inexpensive.
Excellent economy. Further, since the decomposed oil is mixed in liquid form with the hot wash water, a large amount of treatment is possible and the efficiency is high. Furthermore, since the wash water is circulated and reused, the burden of wastewater treatment is small.

[Brief description of drawings]

FIG. 1 is a schematic view of a chlorine removing apparatus of the present invention using a mixing and separation type tank.

FIG. 2 is a schematic diagram of a chlorine removing apparatus of the present invention using a tubular mixer and a separation tank.

FIG. 3 is a schematic diagram of a chlorine removing apparatus of the present invention using a mixing tank and a centrifugal decanter.

FIG. 4 is a schematic view of a thermal decomposition device for resin-containing waste.

FIG. 5 is a schematic view of a thermal decomposition device for resin-containing waste.

[Explanation of symbols]

10-desalination section, 11-supply line, 12-heat exchanger, 13
-Pressurizing pump, 14-line, 15-line, 16-chlorine removing means, 17-heat exchanger, 18-water tank, 19-supply line

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[Procedure amendment]

[Submission date] March 28, 2002 (2002.3.2)
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   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenji Nishimura             1002-1 Mukaiyama, Naka-machi, Naka-gun, Ibaraki Prefecture             Materials Research Laboratories Naka Research Center             In the center (72) Inventor Naoki Teramae             1002-1 Mukaiyama, Naka-machi, Naka-gun, Ibaraki Prefecture             Materials Naka Research Center (72) Inventor Ko Hatakeyama             1002-1 Mukaiyama, Naka-machi, Naka-gun, Ibaraki Prefecture             Materials Naka Research Center F-term (reference) 4F301 AA12 AA17 AA20 AA25 AA26                       AA29 CA09 CA24 CA26 CA41                       CA52 CA72 CA73                 4H015 AA02 AA17 AB01 BA08 BA12                       BB02 BB03 BB13 CB01                 4H029 CA01 CA14

Claims (11)

[Claims] 1. An oily thermal decomposition product produced by thermal decomposition of a resin-containing waste is mixed with hot washing water in a liquid state, and chlorine components such as inorganic chlorine or inorganic chloride contained in the thermal decomposition product are converted into an aqueous phase. A method for removing chlorine from a thermal decomposition product of a resin-containing waste, characterized in that the liquid decomposition product of the oil phase separated from the aqueous phase is recovered after being transferred to the outside of the system. 2. The chlorine removal method according to claim 1, wherein the supply system of the thermal decomposition product and the hot wash water is 150 ° C. or higher to 200 ° C.
A method for removing chlorine, which is maintained below and at 7 to 20 atm, and the above thermal decomposition product is mixed in a liquid form with hot washing water to transfer the chlorine content contained in the thermal decomposition product to an aqueous phase to remove it outside the system. 3. The method for removing chlorine according to claim 1 or 2, wherein the hot wash water separated from the oil phase is withdrawn to remove chloride in the liquid, and then used again for removing chlorine from the thermal decomposition product. 4. The chlorine removing method according to claim 1, 2 or 3, wherein the resin-containing waste is pyrolyzed in oil to decompose and volatilize a chlorine component contained therein and to suppress volatilization of a light organic component. A method in which the cracked oil collected by the above method is used as the thermal decomposition product. 5. The chlorine removal method according to claim 4, wherein the thermal decomposition is controlled by using the density of the molten oil or the decomposed oil generated by the thermal decomposition of the resin-containing waste as an index.
Melt cracking process that decomposes chlorine contained in resin-containing waste by volatilization and removal, and obtains melt oil that suppresses volatilization of light organic components, and further thermally decomposes melt oil to reform it into cracked oil A method for removing chlorine using the cracked oil recovered via the reforming and adjusting step as the thermal decomposition product. 6. A desalted cracked oil having a chlorine content of 0.1 wt% or less, which is obtained by the chlorine removal method according to claim 4. 7. A solid fuel having a chlorine content of 0.1 wt% or less and a pencil hardness of 3B or less, which is obtained by cooling and solidifying the desalted cracked oil obtained by the chlorine removal method of claim 4. 8. A desalting section for mixing a liquid thermal decomposition product (decomposed oil) obtained by thermal decomposition of a resin-containing waste with hot washing water,
Pipeline for supplying the thermal decomposition product and hot wash water to the desalination section, heat exchange means and pressurizing means provided in the supply pipeline, pipeline for extracting cracked oil from the desalination section, the desalination section A circulation line for extracting the aqueous phase from the water supply line to the hot wash water supply line, a cooler for cooling the hot wash water in the circulation line, and means for removing inorganic chloride from the cooled wash water are provided. A device that removes chlorine from thermal decomposition products of resin-containing waste. 9. The chlorine removing device according to claim 8, wherein the desalting section is formed by a mixing tank equipped with a stirrer and a phase separation promoting section. 10. The chlorine removing apparatus according to claim 8, wherein the demineralization section is formed by a tubular mixer and a separation tank for storing the mixed liquid introduced from the mixer and separating it into an oil phase and an aqueous phase. Chlorine removal equipment. 11. The chlorine removing apparatus according to claim 8, wherein the demineralizing section is formed by a mixing tank equipped with a stirrer and a centrifugal decanter for separating the mixed liquid introduced from the mixing tank into an oil phase and an aqueous phase. Chlorine removal equipment.