Apparatus and method for facilitating separation of urea dewaxing complex from dewaxing fluid

Abstract

The application discloses a device and a method for promoting separation of urea dewaxing complex and dewaxing liquid, and belongs to the technical field of lubricating oil, paraffin, asphalt and other oil refining product production technologies, and comprises a supporting frame, an impact stroke adjusting screw, an impact electromagnet, an impact conducting column, a supporting disc and a beaker, a first supporting plate is arranged above the bottom of the supporting frame, a through hole through which the impact stroke adjusting screw passes is arranged on the first supporting plate, the bottom of the supporting frame is connected with the impact electromagnet through the impact stroke adjusting screw, the impact stroke adjusting screw is threadedly connected with the through hole of the first supporting plate, a second supporting plate is arranged in the supporting frame above the impact electromagnet, the impact conducting column is movably arranged on the second supporting plate, a third supporting plate is arranged in the supporting frame above the impact conducting column, the second supporting plate is connected with the supporting column below the supporting disc through a spring, and the beaker is arranged on the supporting disc. The application effectively reduces the aromatic hydrocarbon content in urea dewaxing product-liquid wax, improves the urea dewaxing product liquid wax yield, improves the complex separation efficiency, and improves the product qualified rate.

Description

Technical Field

[0001] This invention belongs to the technical field of production of special oil refining products such as lubricating oil, paraffin wax, and asphalt, and specifically relates to a device and method for promoting the separation of urea dewaxing complex and dewaxing liquid. Background Technology

[0002] The isopropanol-urea dewaxing method (patent number CN102181305B) is a domestic process for producing low-pour-point diesel and liquid paraffin through continuous sedimentation of waxy oil. The principle involves the reaction of urea with n-alkane liquid paraffin in the feedstock to form a complex. This complex is then separated from the non-n-alkane low-pour-point diesel that has not been complexed by urea, ultimately yielding two high-value-added products: low-pour-point diesel and liquid paraffin. The process includes a complexation reaction unit with the isopropanol-urea solution and feedstock, a complex-dewaxing liquid-cooled separation and solvent oil washing unit, a complex decomposition unit, an oil and wax washing unit, an oil and wax distillation unit, and an isopropanol recovery unit.

[0003] The purpose of the complex-dewaxing liquid cold separation and solvent oil washing process is to make the complex purer, increase the content of n-alkane in liquid paraffin products, reduce the content of aromatics in liquid wax, and ensure the quality of liquid paraffin products.

[0004] The existing process for cold separation of complexes and dewaxing liquid, followed by solvent oil washing, utilizes the density difference and natural sedimentation method to separate the complexes from the dewaxing liquid.

[0005] After the complexation reaction mixture from the complexation reaction sleeve enters the settling tank, it is separated into dewaxed liquid and complex by sedimentation due to density differences. The complex is pumped out and sent to the washing section for washing. After two washing stages, the upper layer of dewaxed liquid and solvent oil in the settling tank and washing tank both flow into the dewaxed liquid collection tank. Stirring screens are placed in the settling tank and washing tank. The stirring screens are slowly stirred by the rotating shaft, allowing the dewaxed oil encased in the complex to grow from small droplets to larger droplets through collision with the stirring screen, eventually detaching from the complex and rising to the upper layer of dewaxed liquid. The lower layer of complex is then washed with solvent oil to remove more dewaxed oil. The lower layer of complex is then heated for decomposition. After decomposition, the upper layer is wax liquid, and the lower layer is an isopropanol-urea solution that is recycled. The wax liquid is washed with water and the solvent oil is evaporated to obtain the product liquid wax. The aromatic content of the liquid wax must not exceed 1%. See the structure of the settling tank. Figure 3 .

[0006] Problems encountered in production:

[0007] Compared with the original design, the existing equipment has increased the urea dewaxing unit's throughput by 3 times, the complex settling time is only about 1 / 3 of the original design, the wash-oil ratio is 1 / 2 of the original design, the raw material aromatic content is higher than the original design value, and the problem of unqualified aromatic content in liquid wax has become prominent.

[0008] The existing production equipment can only separate complexes by using a mesh agitator for slow and long-term stirring, which results in poor separation effect, long time consumption, and liquid wax aromatics exceeding 1%.

[0009] The limited settling space in the settling tank and washing tank reduces the yield of liquid wax and decreases product profits in order to ensure the quality of liquid wax aromatics.

[0010] 1. Existing methods for separating complexes have long sedimentation times, resulting in incomplete separation of dewaxed oil from the complexes.

[0011] 2. The yield of liquid wax is low and the improvement is limited, and the "aromatic content" index in liquid wax is difficult to meet the standard. Summary of the Invention

[0012] To address the aforementioned problems, this invention proposes a device and method for promoting the separation of urea dewaxing complex and dewaxing liquid, comprising a support frame, an impact stroke adjusting screw, an impact electromagnet, an impact transmission column, a support plate, and a beaker. A first support plate is disposed above the bottom of the support frame, and the first support plate has a through hole for the impact stroke adjusting screw to pass through. The bottom of the support frame is connected to the impact electromagnet via the impact stroke adjusting screw, and the impact stroke adjusting screw is threadedly connected to the through hole of the first support plate. A second support plate is disposed in the support frame above the impact electromagnet, and the impact transmission column is movably disposed on the second support plate. A third support plate is disposed in the support frame above the impact transmission column. The second support plate is connected to a support column below the support plate via a spring, and the beaker is disposed on the support plate.

[0013] Furthermore, an impact head is provided on the impact electromagnet.

[0014] Furthermore, a circular hole is provided on the second support plate, and the impact transmission column is a cylinder with a ring fixedly fitted on it. The cylinder below the ring passes through the circular hole, and the diameter of the ring is larger than the diameter of the circular hole.

[0015] Furthermore, a spring limiting plate is fixedly installed on the support column, the spring is sleeved on the support column, one end of the spring is connected to the spring limiting plate, and the other end of the spring is connected to the third support plate.

[0016] Furthermore, the third support plate is provided with perforations, and the lower part of the support column passes through the perforations on the third support plate. In the impact state, the lower part of the support column is connected to the impact transmission column.

[0017] Furthermore, during impact, the impact head is connected to the impact transmission post.

[0018] A method for separating urea dewaxing complex from dewaxing solution, characterized by comprising the following steps:

[0019] S1. Place the beaker on the tray;

[0020] S2. When the system is working, the impact electromagnet performs impact motion under the drive of an electrical signal with adjustable pulse width and period. When the electrical signal arrives, the impact head of the impact electromagnet extends rapidly and strikes the impact transmission column. The impact transmission column moves upward and strikes the lower part of the bearing plate. The bearing plate transmits the impact force to the beaker and acts as a complex inside.

[0021] S3. After the pulse, the impact electromagnet quickly returns to its original position, the impact guide column falls freely back, and the bearing spring absorbs the impact energy.

[0022] Furthermore, the distance between the impact electromagnet and the impact conduction column is adjusted by adjusting the impact stroke adjustment screw, thereby adjusting the magnitude of the impact force. The impact frequency is controlled by a pulse signal. The pulse wave generated by the impact electromagnet acts on the bottom of the beaker-like container and is conducted to the complex inside the container. The dewaxing liquid contained in the complex is accelerated upward after being subjected to force and rises to the upper layer of the complex, thus realizing the separation of the dewaxing liquid from the complex.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. This invention effectively reduces the aromatic content in urea dewaxing product liquid wax, increases the yield of urea dewaxing product liquid wax, improves the separation efficiency of complexes, and increases the product qualification rate.

[0025] 2. The present invention aims to effectively separate dewaxed oil and complexes, and reduce the amount of washing oil used in the complexe washing process.

[0026] 3. This invention effectively shortens the separation time, saves equipment settling space, and can reduce the aromatic content in liquid wax without increasing the size of the settling tank and washing tank, thereby improving the product qualification rate. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the device for promoting the separation of urea dewaxing complex and dewaxing liquid according to the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the device for promoting the separation of urea dewaxing complex and dewaxing liquid under impact conditions according to the present invention;

[0029] Figure 3 This is a structural diagram of a settling tank in the existing technology.

[0030] The attached figures are labeled as follows: 1. Beaker, 2. Support plate, 21. Support column, 211. Spring limiting plate, 3. Impact transmission column, 4. Impact head, 5. Impact electromagnet, 6. Impact stroke adjusting screw, 7. Support frame, 71. First support frame, 72. Second support frame, 73. Third support frame, 8. Spring. Detailed Implementation

[0031] Example 1

[0032] An apparatus and method for promoting the separation of urea dewaxing complex and dewaxing liquid, such as Figures 1-2 As shown, the device includes a support frame 7, an impact stroke adjusting screw 6, an impact electromagnet 5, an impact transmission column 3, a support plate 2, and a beaker 1. A first support plate 71 is provided above the bottom of the support frame 7. The first support plate 71 has a through hole for the impact stroke adjusting screw 6 to pass through. The bottom of the support frame 7 is connected to the impact electromagnet 5 through the impact stroke adjusting screw 6. The impact stroke adjusting screw 6 is threadedly connected to the through hole of the first support plate 71. A second support plate 72 is provided in the support frame 7 above the impact electromagnet 5. The impact transmission column 3 is movably arranged on the second support plate 72. A third support plate 73 is provided in the support frame 7 above the impact transmission column 3. The second support plate 73 is connected to the support column 21 below the support plate 2 through a spring 8. The beaker 1 is placed on the support plate 2.

[0033] An impact head 4 is provided on the impact electromagnet 5.

[0034] The second support plate 72 has a circular hole, the impact transmission column 3 is a cylinder, and a circular ring is fixedly sleeved on it. The cylinder below the circular ring passes through the circular hole, and the diameter of the circular ring is larger than the diameter of the circular hole.

[0035] A spring limiting plate 211 is fixedly installed on the support column 21. A spring 8 is sleeved on the support column 21, with one end of the spring 8 connected to the spring limiting plate 211 and the other end of the spring 8 connected to the third support plate 73.

[0036] The third support plate 73 is provided with a through hole, and the lower part of the support column 21 passes through the through hole on the third support plate 73. In the impact state, the lower part of the support column 21 is connected to the impact transmission column 3.

[0037] In the impact state, the impact head 4 is connected to the impact transmission column 3.

[0038] A method for separating urea dewaxing complex from dewaxing solution includes the following steps:

[0039] S1. Place the beaker on the support plate 2;

[0040] S2. When the system is working, the impact electromagnet 5 performs impact motion under the drive of an electrical signal with adjustable pulse width and period. When the electrical signal arrives, the impact head 4 of the impact electromagnet extends quickly and strikes the impact transmission column 3. The impact transmission column 3 moves upward and strikes the lower part of the bearing plate 2. The bearing plate 2 transmits the impact force to the beaker and acts as a complex inside.

[0041] S3. After the pulse, the impact electromagnet quickly returns to its original position, the impact guide post 3 falls freely back, and the bearing plate 2 and spring 8 absorb the impact energy.

[0042] The distance between the impact electromagnet 5 and the impact conduction column 3 is adjusted by the impact stroke adjustment screw 6 to adjust the magnitude of the impact force. The impact frequency is controlled by a pulse signal. The pulse wave generated by the impact electromagnet 5 acts on the bottom of the beaker-like container and is conducted to the complex inside the container. The dewaxing liquid contained in the complex is accelerated upward after being subjected to force and rises to the upper layer of the complex, thus realizing the separation of the dewaxing liquid from the complex.

[0043] This invention can further improve the yield of liquid wax in urea dewaxing products, reduce the aromatic content in liquid wax, improve the separation efficiency of complexes, and increase the product qualification rate.

[0044] This invention completes the laboratory research and development phase, employing pulse waves, through... Figure 2 The device operates at the bottom of a beaker-like container, conducting energy to the complex inside. The dewaxing liquid trapped within the complex is accelerated upwards by this force, rising to the upper layer of the complex, thus separating the dewaxing liquid from the complex. Compared to existing technologies that rely on gravity and stirring, this pulse method increases the rising speed of the dewaxing liquid, achieving the same separation effect in a shorter time.

[0045] When the system is working, the impact electromagnet 4 performs impact motion under the drive of an electrical signal with adjustable pulse width and period. When the electrical signal arrives, the impact head 4 of the impact electromagnet extends rapidly and strikes the impact transmission column 3. The impact transmission column 3 moves upward and strikes the lower part of the bearing plate 2. The bearing plate 2 transmits the impact force to the beaker and acts as a complex inside.

[0046] After the pulse, the impact electromagnet quickly returns to its original position. The impact guide post 3 falls freely back. The spring on the bearing plate 2 absorbs the impact energy. The impact stroke adjusting screw 5 adjusts the distance between the impact electromagnet 4 and the impact guide post 3, thus adjusting the magnitude of the impact force. The impact frequency is controlled by the pulse signal.

[0047] This method can improve the separation efficiency of dewaxed oil and complexes in containers, effectively shortening the separation time of laboratory dewaxed oil and complexes. The next step will focus on applying laboratory pulse separation technology to industrial production equipment; based on current understanding, this technology has significant development potential.

[0048] 1. The beaker is placed on the support plate 2. The support plate 2 is supported by a spring to relieve the rebound force and provide free play.

[0049] 2. Impact transmission column 3 is used to transmit impact force and provide impact inertia.

[0050] 3. The impact electromagnet 4 performs periodic impact motion under the control of pulse signals, which is the source of the impact force.

[0051] 4. Impact stroke adjusting screw 5 is used to adjust the magnitude of the impact force.

[0052] The results of Experiment 1 are as follows:

[0053] Take the intermediate product complex and tap the container wall of the complex evenly in the laboratory for 10 minutes to separate the upper dewaxing liquid. Heat the complex to decompose it. After washing the upper wax liquid with water and evaporating the solvent oil, the wax aromatic content is 4.34%. Stir slowly with a mesh stirrer for 20 minutes, and the liquid wax aromatic content is 7.74%.

[0054] The results of Experiment 2 are as follows:

[0055] A pulse device is used to act on the beaker. Figure 2 The pulse frequency was 30 / minute, the impact stroke was 2 cm, and the process lasted for 20 minutes. The upper dewax liquid was separated, and the complex was decomposed by heating. After the upper wax liquid was washed with water and the solvent oil was evaporated, the aromatic content in the liquid wax was 2.13%. The liquid wax was then slowly stirred with a mesh stirrer for 20 minutes, and the aromatic content in the liquid wax was 7.74%.

[0056] The results of Experiment 3 are as follows:

[0057] A pulse device is used to act on the beaker. Figure 2 The pulse frequency is 30 / minute, the impact stroke is 2 cm, and the process lasts for 20 minutes. The process involves one stage of sedimentation and cold separation, and two stages of solvent oil washing. The upper dewaxed liquid is separated, and the complex is heated and decomposed. After the upper wax liquid is washed with water and the solvent oil is evaporated, the wax aromatic content is 0.52%. The liquid wax is then slowly stirred with a mesh stirrer for 20 minutes, and the wax aromatic content is 1.24%.

[0058] Experiment 1 is actually a test result of manually simulating pulse frequency; the pulse device is used to... Figure 2 The equipment that provides power, the aromatic content in liquid wax is an indicator of liquid paraffin products, which is required to be <1%. The purpose of this invention is to reduce the aromatic content in liquid paraffin, that is, under the same time comparison, the pulse method can significantly reduce the aromatic content in liquid wax.

[0059] Experiment 2 is a comparison of data obtained by applying the method only once.

[0060] Experiment 3 compares the aromatic content in the final liquid wax product of the complex, following the actual production process, with one sedimentation and two solvent oil washes.

[0061] Once the separation space is determined, it meets the requirement of reducing the aromatic content of liquid paraffin by less than 1%.

[0062] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for promoting the separation of urea dewaxing complex and dewaxing solution, characterized in that, The separation is carried out by a separation device, which includes a support frame (7), an impact stroke adjusting screw (6), an impact electromagnet (5), an impact transmission column (3), a bearing plate (2), and a beaker (1). A first support plate (71) is provided above the bottom of the support frame (7). The first support plate (71) has a through hole for the impact stroke adjusting screw (6) to pass through. The bottom of the support frame (7) is connected to the impact electromagnet (5) through the impact stroke adjusting screw (6). The impact stroke adjusting screw (6) is threadedly connected to the through hole of the first support plate (71). A second support plate (72) is provided in the support frame (7) above the impact electromagnet (5). The impact transmission column (3) is movably provided on the second support plate (72). A third support plate (73) is provided in the support frame (7) above the impact transmission column (3). The third support plate (73) is connected to the support column (21) below the bearing plate (2) through a spring (8). The beaker (1) is placed on the bearing plate (2). An impact head (4) is provided on the impact electromagnet (5); The second support plate (72) is provided with a circular hole. The impact transmission column (3) is a cylinder with a ring fixedly fitted on it. The cylinder below the ring passes through the circular hole. The diameter of the ring is larger than the diameter of the circular hole. A spring limiting plate (211) is fixedly installed on the support column (21). The spring (8) is sleeved on the support column (21). One end of the spring (8) is connected to the spring limiting plate (211), and the other end of the spring (8) is connected to the third support plate (73). The third support plate (73) is provided with a perforation, and the bottom of the support column (21) passes through the perforation on the third support plate (73). In the impact state, the bottom of the support column (21) is connected to the impact transmission column (3). During impact, the impact head (4) is connected to the impact transmission column (3); The separation method includes the following steps: S1. Place the beaker on the tray (2); S2. When the system is working, the impact electromagnet (5) performs impact motion under the drive of an electrical signal that can adjust the pulse width and period. When the electrical signal arrives, the impact head (4) extends quickly and strikes the impact transmission column (3). The impact transmission column (3) moves upward and strikes the lower part of the bearing plate (2). The bearing plate (2) transmits the impact force to the beaker and acts on the complex inside. S3. After the pulse, the impact electromagnet quickly returns to its original position, the impact transmission column (3) falls freely back, and the bearing plate (2) and spring (8) absorb the impact energy. The distance between the impact electromagnet (5) and the impact conduction column (3) is adjusted by adjusting the impact stroke adjustment screw (6), thereby adjusting the magnitude of the impact force. The impact frequency is controlled by a pulse signal. The pulse wave generated by the impact electromagnet (5) acts on the bottom of the beaker and is conducted to the complex inside the beaker. The dewaxing liquid contained in the complex is accelerated upward after being subjected to force and rises to the upper layer of the complex, thus realizing the separation of the dewaxing liquid from the complex.

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