Dechlorination device and dechlorination method
By using a two-stage dechlorination reaction system and recycling the dechlorinating agent, the problem of high dechlorination cost of pyrolysis oil was solved, achieving low-cost and high-efficiency dechlorination.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-09
- Publication Date
- 2026-04-14
AI Technical Summary
Existing technologies for dechlorination of pyrolysis oil are costly, making it difficult to effectively address issues such as equipment corrosion and catalyst poisoning.
A two-stage dechlorination reaction system is adopted, in which the pyrolysis oil is initially and then dechlorinated by aqueous solutions of dechlorinating agent of different concentrations through the first and second dechlorination reaction devices, and the dechlorinating agent aqueous solution after the reaction is recycled to avoid waste.
It effectively reduces the cost of dechlorination of pyrolysis oil, reduces the risk of equipment corrosion and catalyst poisoning, and improves dechlorination efficiency.
Smart Images
Figure CN121852086A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of oil dechlorination technology, specifically relating to a dechlorination device and a dechlorination method. Background Technology
[0002] As conventional light crude oil resources gradually dwindle, global crude oil quality is trending towards heavier and lower grades, with increased levels of heteroatoms such as chlorine, sulfur, and nitrogen, exacerbating equipment corrosion and increasing the difficulty of subsequent processing. Meanwhile, utilizing waste tires, waste plastics, and other solid waste to produce fuel oil or chemical feedstocks has become an important way to recycle resources and effectively alleviate energy pressure. However, the complexity of the raw material sources results in high chlorine content in such pyrolysis oils, which easily leads to equipment corrosion, catalyst poisoning, and coking, hindering their clean and efficient utilization. Therefore, dechlorination of pyrolysis oil is necessary. However, among related technologies, dechlorination of pyrolysis oil is costly. Summary of the Invention
[0003] This application aims to provide a dechlorination device and method, which at least solves the problem of high cost for dechlorination of pyrolysis oil.
[0004] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a dechlorination device, which includes: a first mixing device, a first dechlorination reaction device, a second mixing device, and a second dechlorination reaction device; The first mixing device has a first liquid inlet and a first liquid outlet, the first dechlorination reaction device has a first feed inlet, a first drain outlet and a first discharge outlet, the second mixing device has a second liquid inlet and a second liquid outlet, the second dechlorination reaction device has a second feed inlet, a second drain outlet and a second discharge outlet, the first liquid outlet is connected to the first feed inlet, the first discharge outlet is connected to the second feed inlet, the second liquid outlet is connected to the second feed inlet, and the second drain outlet is connected to the second feed inlet; The system comprises the following components: a first inlet for receiving the oil to be dechlorinated and a first-concentration dechlorinating agent aqueous solution; a first mixing device for mixing the oil to be dechlorinated and the first-concentration dechlorinating agent aqueous solution; a first dechlorination reaction device for reacting the oil to be dechlorinated and the first-concentration dechlorinating agent aqueous solution entering the first dechlorination reaction device to perform preliminary dechlorination of the oil to be dechlorinated; a first outlet for discharging wastewater after the reaction; a first discharge outlet for discharging the preliminarily dechlorinated oil; a second inlet for receiving the preliminarily dechlorinated oil and a second-concentration dechlorinating agent aqueous solution; a second mixing device for mixing the preliminarily dechlorinated oil and the second-concentration dechlorinating agent aqueous solution; a second dechlorination reaction device for reacting the preliminarily dechlorinated oil and the second-concentration dechlorinating agent aqueous solution entering the second dechlorination reaction device to perform secondary dechlorination of the preliminarily dechlorinated oil; and a second outlet for discharging the dechlorinating agent aqueous solution after the reaction.
[0005] Optionally, the first liquid inlet includes a first sub-liquid inlet and a second sub-liquid inlet, the first sub-liquid inlet and the second sub-liquid inlet being spaced apart; the second liquid inlet includes a third sub-liquid inlet and a fourth sub-liquid inlet, the third sub-liquid inlet and the fourth sub-liquid inlet being spaced apart; and the third sub-liquid inlet is connected to the first discharge port.
[0006] Optionally, the first dechlorination reaction device includes a first dechlorination reaction vessel, a first heating element, and a first pressurizing element; The first dechlorination reaction vessel has a first inlet, a first drain outlet and a first outlet. The first heating element and the first pressurizing element are both disposed in the first dechlorination reaction vessel. The first heating element is used to heat the interior of the first dechlorination reaction vessel, and the first pressurizing element is used to pressurize the interior of the first dechlorination reaction vessel.
[0007] Optionally, the second dechlorination reaction device includes a second dechlorination reaction vessel, a second heating element, and a second pressurizing element; The second dechlorination reaction vessel has a second inlet, a second outlet and a second outlet. The second heating element and the second pressurizing element are both provided in the second dechlorination reaction vessel. The second heating element is used to heat the interior of the second dechlorination reaction vessel, and the second pressurizing element is used to pressurize the interior of the second dechlorination reaction vessel.
[0008] Optionally, the dechlorination device further includes a first delivery pump; The first end of the first delivery pump is connected to the first liquid outlet, and the second end of the first delivery pump is connected to the first feed inlet. The first delivery pump is used to pump the liquid flowing out of the first mixing device to the first dechlorination reaction device.
[0009] Optionally, the dechlorination device further includes a second delivery pump; The first end of the second delivery pump is connected to the second liquid outlet, and the second end of the second delivery pump is connected to the second feed inlet. The second delivery pump is used to pump the liquid flowing out of the second mixing device to the second dechlorination reaction device.
[0010] Optionally, the dechlorination device further includes connecting pipes and circulation pipes; One end of the connecting pipe is connected to the second liquid outlet, and the other end of the connecting pipe is connected to the second feed inlet. One end of the circulation pipe is connected to the second liquid outlet, and the other end of the circulation pipe is connected to the connecting pipe.
[0011] Secondly, embodiments of this application propose a dechlorination method, applied in the dechlorination device described in any one of the first aspects above, the dechlorination method comprising: A first mixture is obtained by mixing an aqueous solution of a first-concentration dechlorinating agent and the oil to be dechlorinated. The first mixture is delivered to the first dechlorination reaction device so that the first mixture reacts in the first dechlorination reaction device; The pre-dechlorinated oil flowing out of the first dechlorination reaction device after the reaction is mixed with an aqueous solution of the second concentration of dechlorinating agent to obtain a second mixture; The second mixture is conveyed to the second dechlorination reaction device to react in the second dechlorination reaction device, and the dechlorinating agent aqueous solution flowing out of the second dechlorination reaction device is conveyed back to the second dechlorination reaction device to circulate the dechlorinating agent aqueous solution, and the dechlorinated oil flowing out of the second dechlorination reaction device is collected.
[0012] Optionally, the dechlorinating agent in the aqueous dechlorinating agent solution includes at least three of the following: tetrabutylammonium hydroxide, tetrabutylammonium chloride, benzyltrimethylammonium hydroxide, benzyltriethylammonium hydroxide, polyethylene glycol, sodium bicarbonate, sodium hexametaphosphate, potassium hydroxide, sodium hydroxide, ethylenediamine, sodium ethoxide, and triethanolamine.
[0013] Optionally, the concentration of the first concentration of the dechlorinating agent aqueous solution is less than the concentration of the second concentration of the dechlorinating agent aqueous solution.
[0014] In this embodiment, since the first mixing device has a first inlet and a first outlet, the oil to be dechlorinated and the first concentration dechlorinating agent aqueous solution can be injected into the first mixing device through the first inlet. The oil to be dechlorinated and the first concentration dechlorinating agent aqueous solution will then mix in the first mixing device, resulting in a relatively uniform mixture. Since the first dechlorination reaction device has a first feed inlet, a first drain outlet, and a first discharge outlet, with the first discharge outlet connected to the first feed inlet, the first concentration dechlorinating agent aqueous solution and the oil to be dechlorinated, after mixing in the first mixing device, can flow to the first feed inlet and into the interior of the first dechlorination reaction device. The first concentration dechlorinating agent aqueous solution and the oil to be dechlorinated will then react in the first dechlorination reaction device. Wastewater generated during the reaction can be discharged from the first drain outlet, and the preliminarily dechlorinated oil after the reaction can flow out from the first discharge outlet. In addition, since the second mixing device has a second inlet and a second outlet, and the first outlet is connected to the second inlet, the preliminary dechlorinated oil flowing out from the first outlet can flow to the second inlet and into the interior of the second mixing device. A second concentration of dechlorinating agent aqueous solution is added to the second mixing device through the second inlet, so that the second concentration of dechlorinating agent aqueous solution and the preliminary dechlorinated oil are mixed in the second mixing device and the mixture is relatively uniform. Since the second dechlorination reactor has a second inlet, a second outlet, and a second outlet, and the second outlet is connected to the second inlet, the uniformly mixed second-concentration dechlorinating agent aqueous solution and the pre-dechlorinated oil in the second mixing device can flow out from the second outlet and into the second inlet, and then into the second dechlorination reactor. The pre-dechlorinated oil and the second-concentration dechlorinating agent aqueous solution will react in the second dechlorination reactor. During the reaction, a portion of the dechlorinating agent in the second-concentration dechlorinating agent aqueous solution is consumed, but a certain amount of dechlorinating agent still exists in the aqueous solution during the reaction. That is, a certain amount of dechlorinating agent still exists in the aqueous solution flowing out from the second outlet. Since the second outlet is connected to the second inlet, the dechlorinating agent aqueous solution flows out from the second outlet and then back into the second inlet, and flows into the second dechlorination reactor, so that the dechlorinating agent aqueous solution is recycled and the waste of the dechlorinating agent aqueous solution is avoided. In other words, in this embodiment of the application, by connecting the second drain port to the second feed port, the dechlorinating agent aqueous solution flowing out from the second drain port of the second dechlorination reaction device can be recycled, thereby avoiding the waste of the dechlorinating agent aqueous solution and the problem of high cost when dechlorinating the dechlorinated oil. That is, by using the dechlorination device provided in this embodiment of the application for dechlorination, the cost of dechlorinating the dechlorinated oil can be effectively reduced. Attached Figure Description
[0015] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This diagram illustrates a dechlorination device provided in an embodiment of this application. Figure 2 This is a flowchart illustrating a dechlorination method provided in an embodiment of this application.
[0016] Figure label: 10: First mixing device; 101: First liquid inlet; 102: First liquid outlet; 1011: First sub-liquid inlet; 1012: Second sub-liquid inlet; 20: First dechlorination reaction device; 21: First dechlorination reaction vessel; 22: First heating element; 23: First pressurizing element; 201: First feed inlet; 202: First drain outlet; 203: First discharge outlet; 30: Second mixing device; 301: Second liquid inlet; 302: Second liquid outlet; 3011: Third sub-liquid inlet; 3012: Fourth sub-liquid inlet; 40: Second dechlorination reaction device; 41: Second dechlorination reaction vessel; 42: Second heating element; 43: Second pressurizing element; 401: Second feed inlet; 402: Second drain outlet; 403: Second discharge outlet; 50: First transfer pump; 60: Second transfer pump; 70: Connecting pipe; 80: Circulation pipe. Detailed Implementation
[0017] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0018] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. "At least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c" can represent: a, b, c, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple.
[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0021] This application provides a dechlorination device, such as... Figure 1 As shown, the dechlorination device includes: a first mixing device 10, a first dechlorination reaction device 20, a second mixing device 30, and a second dechlorination reaction device 40.
[0022] The first mixing device 10 has a first inlet 101 and a first outlet 102; the first dechlorination reaction device 20 has a first feed inlet 201, a first drain inlet 202, and a first outlet 203; the second mixing device 30 has a second inlet 301 and a second outlet 302; and the second dechlorination reaction device 40 has a second feed inlet 401, a second drain inlet 402, and a second outlet 403. The first outlet 102 is connected to the first feed inlet 201, the first outlet 203 is connected to the second inlet 301, the second outlet 302 is connected to the second feed inlet 401, and the second drain inlet 402 is connected to the second feed inlet 401. The first inlet 101 is used for the inflow of the oil to be dechlorinated and a first-concentration dechlorinating agent aqueous solution; the first mixing device 10 is used for mixing the oil to be dechlorinated and the first-concentration dechlorinating agent aqueous solution. The first dechlorination reaction device 20 is used to react the oil to be dechlorinated and the first concentration dechlorinating agent aqueous solution entering the first dechlorination reaction device 20 to perform preliminary dechlorination of the oil to be dechlorinated. The first drain port 202 is used to discharge the wastewater after the reaction. The first discharge port is used to discharge the oil that has been preliminarily dechlorinated. The second inlet port 301 is used to allow the oil that has been preliminarily dechlorinated and the second concentration dechlorinating agent aqueous solution to flow in. The second mixing device 30 is used to mix the oil that has been preliminarily dechlorinated and the second concentration dechlorinating agent aqueous solution. The second dechlorination reaction device 40 is used to react the oil that has been preliminarily dechlorinated and the second concentration dechlorinating agent aqueous solution entering the second dechlorination reaction device 40 to perform secondary dechlorination of the oil that has been preliminarily dechlorinated. The second drain port 402 is used to discharge the dechlorinating agent aqueous solution after the reaction. The concentration of the first concentration dechlorinating agent aqueous solution is different from the concentration of the second concentration dechlorinating agent aqueous solution.
[0023] In this embodiment, since the first mixing device 10 has a first inlet 101 and a first outlet 102, the oil to be dechlorinated and the first concentration dechlorinating agent aqueous solution can be injected into the first mixing device 10 through the first inlet 101. The oil to be dechlorinated and the first concentration dechlorinating agent aqueous solution will then mix in the first mixing device 10, making the oil to be dechlorinated and the first concentration dechlorinating agent aqueous solution mixed more evenly. Since the first dechlorination reaction device 20 has a first inlet 201, a first outlet 202, and a first outlet 203, and the first outlet 102 is connected to the first inlet 201, the first concentration dechlorinating agent aqueous solution and the oil to be dechlorinated after being mixed in the first mixing device 10 can flow to the first inlet 201 and flow into the interior of the first dechlorination reaction device 20 through the first inlet 201. The first concentration dechlorinating agent aqueous solution and the oil to be dechlorinated will then react in the first dechlorination reaction device 20. Wastewater during the reaction process can be discharged from the first outlet 202, and the initially dechlorinated oil after the reaction can flow out from the first outlet 203. In addition, since the second mixing device 30 has a second liquid inlet 301 and a second liquid outlet 302, and the first discharge outlet 203 is connected to the second liquid inlet 301, the preliminary dechlorinated oil flowing out from the first discharge outlet 203 can flow to the second liquid inlet 301 and into the interior of the second mixing device 30. A second concentration of dechlorinating agent aqueous solution is added to the second mixing device 30 through the second liquid inlet 301, so that the second concentration of dechlorinating agent aqueous solution and the preliminary dechlorinated oil are mixed in the second mixing device 30 and the mixture is relatively uniform. Since the second dechlorination reaction device 40 has a second inlet 401, a second outlet 402, and a second outlet 403, with the second outlet 402 connected to the second inlet 401 and the second outlet 402 connected to the second inlet 401, the uniformly mixed second-concentration dechlorinating agent aqueous solution and the pre-dechlorinated oil in the second mixing device 30 can flow out from the second outlet 402 and into the second inlet 401, thus flowing into the second dechlorination reaction device 40. The pre-dechlorinated oil and the second-concentration dechlorinating agent aqueous solution will then be mixed in the second dechlorination reaction device 40. In the reaction, a portion of the dechlorinating agent in the second concentration dechlorinating agent aqueous solution is consumed during the reaction process. However, a certain amount of dechlorinating agent still exists in the aqueous solution during the reaction process. That is, a certain amount of dechlorinating agent still exists in the aqueous solution flowing out from the second drain port 402. The second drain port 402 is connected to the second feed port 401, so that the dechlorinating agent aqueous solution flows out from the second drain port 402 and flows back to the second feed port 401 and into the second dechlorination reaction device 40, so that the dechlorinating agent aqueous solution is recycled and the dechlorinating agent aqueous solution is not wasted.That is, in this embodiment of the application, by connecting the second drain port 402 with the second feed port 401, the dechlorinating agent aqueous solution flowing out from the second drain port 402 of the second dechlorination reaction device 40 can be recycled, thereby avoiding the waste of the dechlorinating agent aqueous solution and the problem of high cost when dechlorinating the dechlorinated oil. In other words, by using the dechlorination device provided in this embodiment of the application for dechlorination, the cost of dechlorinating the dechlorinated oil can be effectively reduced.
[0024] It should be noted that when the oil to be dechlorinated and the aqueous solution of the first concentration of dechlorinating agent react in the first dechlorination reaction device 20, the oil to be dechlorinated contains a lot of impurities, so the aqueous solution flowing out from the first drain port 202 of the first dechlorination reaction device 20 contains a lot of impurities, that is, sewage flows out from the first drain port 202 of the first dechlorination reaction device 20.
[0025] In addition, in the embodiments of this application, both the first mixing device 10 and the second mixing device 30 can be static mixers, so that the liquid in the first mixing device 10 can be mixed evenly and the liquid in the second mixing device 30 can be mixed evenly.
[0026] In addition, in this embodiment, the dechlorination device may further include a heat exchange device. A heat exchange pipe is connected to the first drain port 202, and the heat exchange pipe is connected to the heat exchange device, allowing the wastewater flowing from the first drain port 202 to exchange heat in the heat exchange device, thus realizing the reuse of heat from the wastewater. The wastewater is then discharged after heat exchange. The heat exchange device can be a plate heat exchanger, or it can be a finned heat exchanger. The specific type of heat exchange device is not limited in this embodiment.
[0027] In addition, in the embodiments of this application, the concentration of the first concentration dechlorinating agent aqueous solution can be less than the concentration of the second concentration dechlorinating agent aqueous solution. For example, the concentration of the first concentration dechlorinating agent aqueous solution is 0.1%, and the concentration of the second concentration dechlorinating agent aqueous solution is 5%.
[0028] Furthermore, in this embodiment, since the second drain port 402 is connected to the second feed port 401, during the dechlorination of the oil to be dechlorinated, the second concentration dechlorinating agent aqueous solution only needs to be added once to the second mixing device 30. Afterwards, the dechlorinating agent aqueous solution flowing out of the second drain port 402 of the second dechlorination reaction device 40 can circulate back into the second dechlorination reaction device 40, achieving circulation, thus eliminating the need to add the second concentration dechlorinating agent aqueous solution to the second mixing device 30 again. Of course, in this embodiment, the second concentration dechlorinating agent aqueous solution can also be added intermittently to the second mixing device 30 during the dechlorination of the oil to be dechlorinated. This embodiment does not limit the scope of this application.
[0029] In addition, in some embodiments, the first liquid inlet 101 may include a first sub-liquid inlet 1011 and a second sub-liquid inlet 1012, with the first sub-liquid inlet 1011 and the second sub-liquid inlet 1012 being spaced apart. The second liquid inlet 301 may include a third sub-liquid inlet 3011 and a fourth sub-liquid inlet 3012, with the third sub-liquid inlet 3011 and the fourth sub-liquid inlet 3012 being spaced apart. The third sub-liquid inlet 3011 is connected to the first discharge port 203.
[0030] With this configuration, when adding a first-concentration dechlorinating agent aqueous solution and the oil to be dechlorinated to the first mixing device 10, the oil to be dechlorinated can be added through one of the first sub-inlet 1011 and the second sub-inlet 1012, while the first-concentration dechlorinating agent aqueous solution can be added through the other of the two sub-inlet 1011 and the second sub-inlet 1012. This avoids the problem of the first-concentration dechlorinating agent aqueous solution being contaminated by the oil to be dechlorinated when adding the first-concentration dechlorinating agent aqueous solution and the oil to be dechlorinated. In addition, the third sub-inlet 3011 is connected to the first outlet 203, so that the initially dechlorinated oil flowing out of the first dechlorination reaction device 20 can flow into the second mixing device 30 through the third sub-inlet 3011. At the same time, the second-concentration dechlorinating agent aqueous solution can be added to the second mixing device 30 through the fourth sub-inlet 3012, thus facilitating the addition of the second-concentration dechlorinating agent aqueous solution to the second mixing device 30.
[0031] It should be noted that, in this embodiment, the first outlet 102 and the first inlet 201 can be connected by a connecting pipe, so that the liquid flowing out of the first outlet 102 flows to the first inlet 201 through the connecting pipe. Additionally, the first outlet 203 and the third sub-inlet 3011 can also be connected by a connecting pipe, so that the pre-dechlorinated oil flowing out of the first outlet 203 flows to the third sub-inlet 3011 through the connecting pipe.
[0032] In some embodiments, the first dechlorination reaction device 20 may include a first dechlorination reaction tank 21, a first heating element 22, and a first pressurizing element 23; the first dechlorination reaction tank 21 has a first inlet 201, a first outlet 202, and a first outlet 203, and the first heating element 22 and the first pressurizing element 23 are both disposed in the first dechlorination reaction tank 21. The first heating element 22 is used to heat the inside of the first dechlorination reaction tank 21, and the first pressurizing element 23 is used to pressurize the inside of the first dechlorination reaction tank 21.
[0033] With this setup, the oil to be dechlorinated and the first concentration of dechlorinating agent aqueous solution, mixed by the first mixing device 10, can flow into the first dechlorination reaction tank 21. This allows the first concentration of dechlorinating agent aqueous solution and the oil to be dechlorinated to react within the first dechlorination reaction tank 21. The first heating element 22 heats the interior of the first dechlorination reaction tank 21, maintaining the temperature within it within a first preset temperature range. The first pressurizing element 23 pressurizes the interior of the first dechlorination reaction tank 21, maintaining the gas pressure within it within a first preset gas pressure range. This ensures effective reaction of the first dechlorinating agent aqueous solution and the oil to be dechlorinated within the first dechlorination reaction tank 21. In other words, by setting up the first heating element 22 and the first pressurizing element 23, effective reaction of the first dechlorinating agent aqueous solution and the oil to be dechlorinated within the first dechlorination reaction tank 21 can be ensured, thus performing preliminary dechlorination of the oil to be dechlorinated.
[0034] It should be noted that the first heating element 22 can maintain the temperature range of the first dechlorination reaction vessel 21 at 60℃-140℃, that is, the first preset temperature range is 60℃-140℃. The first pressurizing element 23 can maintain the gas pressure range of the first dechlorination reaction vessel 21 at 4.5 atmospheres to 5.5 atmospheres, that is, the first preset gas pressure range is 4.5 atmospheres to 5.5 atmospheres. For example, the first heating element 22 can heat the inside of the first dechlorination reaction vessel 21 to a temperature of 120°C, and the first pressurizing element 23 can pressurize the inside of the first dechlorination reaction vessel 21 to a pressure of 5 atmospheres, which is equivalent to the first concentration of dechlorination agent aqueous solution and the oil to be dechlorinated reacting at a temperature of 120°C and a pressure of 5 atmospheres.
[0035] Furthermore, in this embodiment, the reaction time of the first concentration dechlorinating agent aqueous solution and the oil to be dechlorinated in the first dechlorination reaction tank 21 can be any time within a first set time range. The first set time range is 0.5h-6h. For example, the reaction time of the first concentration dechlorinating agent aqueous solution and the oil to be dechlorinated in the first dechlorination reaction tank 21 is 0.5h. Another example is that the reaction time of the first concentration dechlorinating agent aqueous solution and the oil to be dechlorinated in the first dechlorination reaction tank 21 is 3h. Yet another example is that the reaction time of the first concentration dechlorinating agent aqueous solution and the oil to be dechlorinated in the first dechlorination reaction tank 21 is 6h.
[0036] In some embodiments, the second dechlorination reaction device 40 may include a second dechlorination reaction tank 41, a second heating element 42, and a second pressurizing element 43; the second dechlorination reaction tank 41 has a second inlet 401, a second outlet 402, and a second outlet 403, and the second heating element 42 and the second pressurizing element 43 are both disposed in the second dechlorination reaction tank 41. The second heating element 42 is used to heat the interior of the second dechlorination reaction tank 41, and the second pressurizing element 43 is used to pressurize the interior of the second dechlorination reaction tank 41.
[0037] With this setup, the pre-dechlorinated oil and the second-concentration dechlorinating agent aqueous solution can flow into the second dechlorination reaction tank 41, allowing them to react within the tank. The second heating element 42 heats the interior of the tank, maintaining the temperature within a preset range. The second pressurizing element 43 pressurizes the interior of the tank, ensuring the pressure remains within a preset range, thus enabling the second dechlorinating agent aqueous solution and the pre-dechlorinated oil to react effectively and dechlorinate the oil. In other words, by using the second heating element 42 and the second pressurizing element 43, the effective reaction of the second dechlorinating agent aqueous solution and the pre-dechlorinated oil in the second dechlorination reaction tank 41 is ensured, resulting in less chlorine in the oil flowing from the second outlet 403.
[0038] It should be noted that the second heating element 42 can maintain the temperature range of the second dechlorination reaction vessel 41 at 60℃-140℃, that is, the second preset temperature range is 60℃-140℃. The second pressurizing element 42 maintains the temperature of the second dechlorination reaction vessel 41 within this range. The second pressurizing element 43 can maintain the gas pressure range of the second dechlorination reaction vessel 41 at 4.5 atmospheres to 5.5 atmospheres, that is, the second preset gas pressure range is 4.5 atmospheres to 5.5 atmospheres. The second pressurizing element 43 maintains the gas pressure of the second dechlorination reaction vessel 41 within this range. For example, the second heating element 42 can heat the inside of the second dechlorination reaction tank 41 to a temperature of 120°C, and the second pressurizing element 43 can pressurize the inside of the second dechlorination reaction tank 41 to a pressure of 5 atmospheres, which is equivalent to the second concentration dechlorination agent aqueous solution and the initially dechlorinated oil reacting at a temperature of 120°C and a pressure of 5 atmospheres.
[0039] Furthermore, in this embodiment, the reaction time of the second concentration dechlorinating agent aqueous solution and the initially dechlorinated oil in the second dechlorination reaction tank 41 can be any time within a second set time range. The second set time range is 0.5h-3h. For example, the reaction time of the second concentration dechlorinating agent aqueous solution and the initially dechlorinated oil in the second dechlorination reaction tank 41 is 0.5h. Another example is that the reaction time of the second concentration dechlorinating agent aqueous solution and the initially dechlorinated oil in the second dechlorination reaction tank 41 is 1h. Yet another example is that the reaction time of the second concentration dechlorinating agent aqueous solution and the initially dechlorinated oil in the second dechlorination reaction tank 41 is 3h.
[0040] Furthermore, in this embodiment, both the first heating element 22 and the second heating element 42 can be heating wires. Of course, the first heating element 22 and the second heating element 42 can be other types, such as heating plates. This embodiment does not limit the specific type of the first heating element 22 and the second heating element 42, as long as they can generate heat.
[0041] In addition, in some embodiments, the dechlorination device may also include a first delivery pump 50; the first end of the first delivery pump 50 is connected to the first liquid outlet 102, the second end of the first delivery pump 50 is connected to the first feed inlet 201, and the first delivery pump 50 is used to pump the liquid flowing out of the first mixing device 10 to the first dechlorination reaction device 20.
[0042] With this setup, once the oil to be dechlorinated and the first concentration dechlorinating agent aqueous solution in the first mixing device 10 are mixed evenly, the mixed oil to be dechlorinated and the first concentration dechlorinating agent aqueous solution flow out from the first outlet 102. The presence of the first delivery pump 50 can accelerate the mixing of the oil to be dechlorinated and the first concentration dechlorinating agent aqueous solution, allowing them to flow quickly into the first dechlorination reaction device 20. In other words, by setting up the first delivery pump 50, the mixed oil to be dechlorinated and the first concentration dechlorinating agent aqueous solution flowing out of the first mixing device 10 can be easily transported to the first dechlorination reaction device 20.
[0043] It should be noted that when the first liquid outlet 102 and the first feed inlet 201 are connected by a connecting pipeline, the first delivery pump 50 can be installed in the connecting pipeline.
[0044] In addition, in some embodiments, the dechlorination device may also include a second transfer pump 60; the first end of the second transfer pump 60 is connected to the second liquid outlet 302, the second end of the second transfer pump 60 is connected to the second feed inlet 401, and the second transfer pump 60 is used to pump the liquid flowing out of the second mixing device 30 to the second dechlorination reaction device 40.
[0045] With this setup, once the initially dechlorinated oil flowing from the first dechlorination reactor 20 flows into the second mixing device 30, and the second-concentration dechlorinating agent aqueous solution also flows into the second mixing device 30, the second mixing device 30 mixes the initially dechlorinated oil and the second-concentration dechlorinating agent aqueous solution evenly. The mixed initially dechlorinated oil and the second-concentration dechlorinating agent aqueous solution then flow out from the second outlet 302. The presence of the second transfer pump 60 accelerates the mixing of the initially dechlorinated oil and the second-concentration dechlorinating agent aqueous solution, allowing them to quickly flow into the second dechlorination reactor 40. In other words, by providing the second transfer pump 60, the mixed initially dechlorinated oil and the second-concentration dechlorinating agent aqueous solution flowing from the second mixing device 30 can be easily transported to the second dechlorination reactor 40.
[0046] It should be noted that when the second liquid outlet 302 and the second feed inlet 401 are connected by a connecting pipeline, the second delivery pump 60 can be installed in the connecting pipeline.
[0047] In addition, in some embodiments, the dechlorination device may also include a connecting pipe 70 and a circulation pipe 80; one end of the connecting pipe 70 is connected to the second outlet 302, and the other end of the connecting pipe 70 is connected to the second inlet 401; one end of the circulation pipe 80 is connected to the second drain 402, and the other end of the circulation pipe 80 is connected to the connecting pipe 70.
[0048] With this setup, once the dechlorinating agent aqueous solution flows out of the second drain port 402, it can flow into the circulation pipe 80, and then into the connecting pipe 70. From there, the dechlorinating agent aqueous solution flows into the second dechlorination reaction device 40 through the connecting pipe 70. In other words, by setting up the connecting pipe 70 and the circulation pipe 80, the second drain port 402 can be easily connected to the second feed port 401, allowing the dechlorinating agent aqueous solution flowing out of the second drain port 402 to be recycled.
[0049] This application also provides a dechlorination method, applicable to the dechlorination device in any of the above embodiments, such as... Figure 2 As shown, the dechlorination method includes: Step 201: Mix the first concentration of dechlorinating agent aqueous solution and the oil to be dechlorinated to obtain the first mixture.
[0050] In this process, a first concentration of dechlorinating agent aqueous solution and the oil to be dechlorinated can be injected into a first mixing device, and the first mixing device mixes the first concentration of dechlorinating agent aqueous solution and the oil to be dechlorinated to obtain a first mixed solution.
[0051] In addition, when mixing the first concentration dechlorinating agent aqueous solution and the oil to be dechlorinated, the first mixing device can mix the first concentration dechlorinating agent aqueous solution and the oil to be dechlorinated evenly, that is, the first mixture is a relatively uniform mixture.
[0052] Step 202: The first mixture is delivered to the first dechlorination reaction device so that the first mixture reacts in the first dechlorination reaction device.
[0053] Once the first mixture is delivered to the first dechlorination reaction device, the first mixer can then react within the device. The temperature range within the first dechlorination reaction device is 60℃-140℃, and the gas pressure is 5 atmospheres. Furthermore, the reaction time within the first dechlorination reaction device ranges from 0.5h to 6h.
[0054] Step 203: Mix the initial dechlorinated oil flowing out of the first dechlorination reaction device after the reaction with the second concentration dechlorination agent aqueous solution to obtain the second mixture.
[0055] In this process, the initially dechlorinated oil can flow out from the first outlet of the first dechlorination reaction device, and then flow into the second mixing device. A second concentration of dechlorinating agent aqueous solution is added to the second mixing device, so that the initially dechlorinated oil and the second concentration of dechlorinating agent aqueous solution are mixed to obtain the second mixture.
[0056] In addition, when mixing the second concentration dechlorinating agent aqueous solution and the initially dechlorinated oil, the second mixing device can mix the second concentration dechlorinating agent aqueous solution and the initially dechlorinated oil evenly, that is, the second mixture is a relatively uniform mixture.
[0057] Step 204: The second mixture is conveyed to the second dechlorination reaction device to react in the second dechlorination reaction device, and the dechlorinating agent aqueous solution flowing out of the second dechlorination reaction device is conveyed back to the second dechlorination reaction device to circulate the dechlorinating agent aqueous solution, and the dechlorinated oil flowing out of the second dechlorination reaction device is collected.
[0058] The process involves conveying the second mixture to the second dechlorination reactor, where it reacts. During the reaction, the dechlorinating agent aqueous solution flowing out of the second dechlorination reactor can exit through the second drain port and re-enter the reactor, achieving dechlorinating agent aqueous solution circulation. The dechlorinated oil flowing out of the second dechlorination reactor can then be collected. Furthermore, the reaction time in the second dechlorination reactor can range from 0.5 h to 3 h, the temperature range can range from 60℃ to 140℃, and the gas pressure in the first dechlorination reactor can be 5 atmospheres.
[0059] In some implementations, the dechlorinating agent in the aqueous dechlorinating agent solution includes at least three of the following: tetrabutylammonium hydroxide, tetrabutylammonium chloride, benzyltrimethylammonium hydroxide, benzyltriethylammonium hydroxide, polyethylene glycol, sodium bicarbonate, sodium hexametaphosphate, potassium hydroxide, sodium hydroxide, ethylenediamine, sodium ethoxide, and triethanolamine.
[0060] For example, the dechlorinating agent in the dechlorination aqueous solution includes tetrabutylammonium hydroxide, tetrabutylammonium chloride, and benzyltrimethylammonium hydroxide; another example is that the dechlorinating agent in the dechlorination aqueous solution includes tetrabutylammonium hydroxide, tetrabutylammonium chloride, benzyltrimethylammonium hydroxide, and benzyltriethylammonium hydroxide; yet another example is that the dechlorinating agent in the dechlorination aqueous solution includes benzyltriethylammonium hydroxide, polyethylene glycol, sodium bicarbonate, sodium hexametaphosphate, potassium hydroxide, sodium hydroxide, ethylenediamine, sodium ethoxide, and triethanolamine.
[0061] Furthermore, in this embodiment, the concentration of the first concentration dechlorinating agent aqueous solution is lower than the concentration of the second concentration dechlorinating agent aqueous solution. This configuration allows for the use of a lower concentration dechlorinating agent aqueous solution during the initial dechlorination of the oil. Since the oil contains many impurities, the first concentration dechlorinating agent aqueous solution becomes wastewater after the initial dechlorination and cannot be reused. This results in a lower concentration of the first concentration dechlorinating agent in water, reducing waste; only a small amount of dechlorinating agent is needed to prepare the first concentration dechlorinating agent aqueous solution. Conversely, since the oil undergoing initial dechlorination contains fewer impurities, using the second concentration dechlorinating agent aqueous solution results in better dechlorination performance. Moreover, the second concentration dechlorinating agent aqueous solution can be recycled, further reducing costs.
[0062] In addition, the dechlorination method provided in the embodiments of this application is illustrated by example: One kg of crude oil with a chlorine content of 85 mg / kg was used as the oil to be dechlorinated. A 0.1% aqueous solution of a dechlorinating agent was added to the oil and mixed using a feed pump to form a first mixture. This first mixture was then fed into a first dechlorination reactor and reacted at 120 °C for 4 hours. After the reaction, the mixture was allowed to settle and separate into layers. The lower layer was wastewater, which could be sent to a wastewater treatment unit; the upper layer yielded the initially dechlorinated oil. The initially dechlorinated crude oil was mixed with a 5% aqueous solution of a compound dechlorinating agent to obtain a second mixture. This second mixture was fed into a second dechlorination reactor and reacted at 130 °C for 2 hours. After the reaction, the mixture was allowed to settle and separate into layers. The upper layer was the dechlorinated oil, with a chlorine content of 3.2 mg / kg; the lower layer contained a solution of the compound dechlorinating agent. This solution containing the compound dechlorinating agent was reused in the dechlorination reaction. After 15 cycles, the chlorine content of the final dechlorinated oil remained stable below 10 mg / kg.
[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0064] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.
Claims
1. A dechlorination device, characterized in that, The dechlorination device includes: a first mixing device, a first dechlorination reaction device, a second mixing device, and a second dechlorination reaction device; The first mixing device has a first liquid inlet and a first liquid outlet, the first dechlorination reaction device has a first feed inlet, a first drain outlet and a first discharge outlet, the second mixing device has a second liquid inlet and a second liquid outlet, the second dechlorination reaction device has a second feed inlet, a second drain outlet and a second discharge outlet, the first liquid outlet is connected to the first feed inlet, the first discharge outlet is connected to the second feed inlet, the second liquid outlet is connected to the second feed inlet, and the second drain outlet is connected to the second feed inlet; The system comprises the following components: a first inlet for receiving the oil to be dechlorinated and a first-concentration dechlorinating agent aqueous solution; a first mixing device for mixing the oil to be dechlorinated and the first-concentration dechlorinating agent aqueous solution; a first dechlorination reaction device for reacting the oil to be dechlorinated and the first-concentration dechlorinating agent aqueous solution entering the first dechlorination reaction device to perform preliminary dechlorination of the oil to be dechlorinated; a first outlet for discharging wastewater after the reaction; a first discharge outlet for discharging the preliminarily dechlorinated oil; a second inlet for receiving the preliminarily dechlorinated oil and a second-concentration dechlorinating agent aqueous solution; a second mixing device for mixing the preliminarily dechlorinated oil and the second-concentration dechlorinating agent aqueous solution; a second dechlorination reaction device for reacting the preliminarily dechlorinated oil and the second-concentration dechlorinating agent aqueous solution entering the second dechlorination reaction device to perform secondary dechlorination of the preliminarily dechlorinated oil; and a second outlet for discharging the dechlorinating agent aqueous solution after the reaction.
2. The dechlorination device according to claim 1, characterized in that, The first liquid inlet includes a first sub-liquid inlet and a second sub-liquid inlet, which are spaced apart. The second liquid inlet includes a third sub-liquid inlet and a fourth sub-liquid inlet, which are spaced apart. The third sub-liquid inlet is connected to the first discharge port.
3. The dechlorination device according to claim 1, characterized in that, The first dechlorination reaction device includes a first dechlorination reaction vessel, a first heating element, and a first pressurizing element; The first dechlorination reaction vessel has a first inlet, a first drain outlet and a first outlet. The first heating element and the first pressurizing element are both disposed in the first dechlorination reaction vessel. The first heating element is used to heat the interior of the first dechlorination reaction vessel, and the first pressurizing element is used to pressurize the interior of the first dechlorination reaction vessel.
4. The dechlorination device according to claim 1, characterized in that, The second dechlorination reaction device includes a second dechlorination reaction vessel, a second heating element, and a second pressurizing element; The second dechlorination reaction vessel has a second inlet, a second outlet and a second outlet. The second heating element and the second pressurizing element are both provided in the second dechlorination reaction vessel. The second heating element is used to heat the interior of the second dechlorination reaction vessel, and the second pressurizing element is used to pressurize the interior of the second dechlorination reaction vessel.
5. The dechlorination device according to claim 1, characterized in that, The dechlorination device also includes a first delivery pump; The first end of the first delivery pump is connected to the first liquid outlet, and the second end of the first delivery pump is connected to the first feed inlet. The first delivery pump is used to pump the liquid flowing out of the first mixing device to the first dechlorination reaction device.
6. The dechlorination device according to claim 1, characterized in that, The dechlorination device also includes a second transfer pump; The first end of the second delivery pump is connected to the second liquid outlet, and the second end of the second delivery pump is connected to the second feed inlet. The second delivery pump is used to pump the liquid flowing out of the second mixing device to the second dechlorination reaction device.
7. The dechlorination device according to claim 1, characterized in that, The dechlorination device also includes connecting pipes and circulation pipes; One end of the connecting pipe is connected to the second liquid outlet, and the other end of the connecting pipe is connected to the second feed inlet. One end of the circulation pipe is connected to the second liquid outlet, and the other end of the circulation pipe is connected to the connecting pipe.
8. A dechlorination method, characterized in that, Applied in the dechlorination apparatus of any one of claims 1-7, the dechlorination method comprises: A first mixture is obtained by mixing an aqueous solution of a first-concentration dechlorinating agent and the oil to be dechlorinated. The first mixture is delivered to the first dechlorination reaction device so that the first mixture reacts in the first dechlorination reaction device; The pre-dechlorinated oil flowing out of the first dechlorination reaction device after the reaction is mixed with an aqueous solution of the second concentration of dechlorinating agent to obtain a second mixture; The second mixture is conveyed to the second dechlorination reaction device to react in the second dechlorination reaction device, and the dechlorinating agent aqueous solution flowing out of the second dechlorination reaction device is conveyed back to the second dechlorination reaction device to circulate the dechlorinating agent aqueous solution, and the dechlorinated oil flowing out of the second dechlorination reaction device is collected.
9. The dechlorination method according to claim 8, characterized in that, The dechlorinating agent in the aqueous solution includes at least three of the following: tetrabutylammonium hydroxide, tetrabutylammonium chloride, benzyltrimethylammonium hydroxide, benzyltriethylammonium hydroxide, polyethylene glycol, sodium bicarbonate, sodium hexametaphosphate, potassium hydroxide, sodium hydroxide, ethylenediamine, sodium ethoxide, and triethanolamine.
10. The dechlorination method according to claim 8, characterized in that, The concentration of the first concentration of the dechlorinating agent aqueous solution is less than the concentration of the second concentration of the dechlorinating agent aqueous solution.