Device for recycling light oil

Abstract

The utility model discloses a device for recycling light oil, and belongs to the technical field of chemical equipment. The device for recycling the light oil is characterized by comprising a buffer tank I, a mixer, an extraction tower, a distillation tower, a buffer tank II and a reboiler, the mixer is provided with a light oil inlet, and the buffer tank I is connected with the mixer to provide a foaming agent; the mixer is connected with a lower-end inlet of the extraction tower; a tower top outlet of the extraction tower is connected with a buffer tank II; a tower kettle outlet is connected with an upper end inlet of the distillation tower; a tower top outlet of the distillation tower is connected with a buffer tank II, and a tower kettle outlet is a discharge port; the bottom of the distillation tower is connected with a reboiler for heating condensate at the bottom of the distillation tower. According to the cyclohexanone recovery device, the recovery rate of cyclohexanone is increased, the purity of the recovered cyclohexanone is higher, the heat at the bottom of the distillation tower is utilized by adding the reboiler, the energy is saved, the efficiency is high, the cyclohexanone is fully recycled, and profit is brought to enterprises.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a device for recycling light oil. Background Technology

[0002] Cyclohexanone is an important chemical raw material. During its preparation, a large amount of light oil is generated. This light oil comprises light components, cyclohexanone, cyclohexanol, cyclohexane, and a small amount of water. The molecular weight and boiling point of the light components are quite similar to those of cyclohexanone, making them difficult to separate through conventional distillation. They are generally discharged directly as light components, which reduces the yield of cyclohexanone and causes economic losses for enterprises, contradicting the resource conservation goals of modern enterprises. Therefore, how to recover cyclohexanone from light oil has become a pressing technical problem for modern enterprises.

[0003] Patent CN 118496077A discloses a process for producing cyclohexanone. This patent, by setting specific detection indicators and employing different separation routes for different indicators, aims to fully recover cyclohexanone from light oil, improve the yield and purity of cyclohexanone products, and further reduce energy consumption in crude alcohol-ketone separation, decrease recycling volume, improve cyclohexanol purity, and increase the activity and lifespan of the cyclohexanol dehydrogenation catalyst. It also offers flexible operation and reduces operating costs. However, this method requires different separation routes for different indicators, making the process complex and necessitating changes in processing paths. This places high demands on operation and undoubtedly increases processing costs. Summary of the Invention

[0004] To address the problems of complex and costly processes in the recovery of cyclohexanone from light oil in existing technologies, this invention provides a device for recovering and utilizing light oil, which fully recovers and utilizes cyclohexanone, and is simple to operate, low in cost, and conducive to widespread application.

[0005] This utility model is achieved through the following technical solution:

[0006] An apparatus for recycling light oil includes a buffer tank I, a mixer, an extraction column, a distillation column, a buffer tank II, and a reboiler;

[0007] The mixer is equipped with a light oil inlet, and buffer tank I is connected to the mixer to provide foaming agent;

[0008] The mixer is connected to the lower inlet of the extraction column; the top outlet of the extraction column is connected to buffer tank II, and the bottom outlet of the extraction column is connected to the upper inlet of the distillation column; the top outlet of the distillation column is connected to buffer tank II, and the bottom outlet of the distillation column is the discharge port.

[0009] The bottom of the distillation column is connected to a reboiler for heating the condensate at the bottom of the distillation column.

[0010] Furthermore, the buffer tank I is provided with a foaming agent inlet, and a foaming agent evaporator is connected between the buffer tank I and the mixer for heating the foaming agent.

[0011] Furthermore, the reboiler is connected to the foaming agent evaporator, and the condensate generated by the reboiler provides heat to the foaming agent evaporator.

[0012] Furthermore, the mixer is equipped with a stirrer.

[0013] Furthermore, the mixer's agitator has a floating valve tray at the lower end of its agitator blade to effectively guide the gaseous foaming agent into the equipment.

[0014] Furthermore, the distance between the lower end of the agitator and the floating valve tray is 350mm.

[0015] Furthermore, the extraction tower is filled with polysaddle ring packing.

[0016] Furthermore, the top of the extraction tower is equipped with an extractant inlet for adding extractant.

[0017] Furthermore, a condenser is connected between the distillation column and buffer tank II.

[0018] Beneficial effects

[0019] This invention separates light components and cyclohexanone from light oil using an extractant. By introducing a foaming agent and a heating device, and combining it with a distillation column, the extraction and separation are made more complete, improving the recovery rate of cyclohexanone. The recovered cyclohexanone has a high purity. Furthermore, by adding a reboiler, the heat at the bottom of the distillation column is utilized, making it energy-efficient and highly effective. This allows for the full recovery and utilization of cyclohexanone, bringing profits to the enterprise. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the device for recycling light oil according to this utility model; 1. Buffer tank I, 2. Foaming agent evaporator, 3. Mixer, 4. Extraction tower, 5. Distillation tower, 6. Buffer tank II, 7. Reboiler, 8. Condenser, 9. Stirrer, 10. Floating valve tray. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings. However, it should not be construed as the scope of the present invention being limited to the following embodiments. All technologies implemented based on the above content of the present invention are within the scope of the present invention.

[0022] A schematic diagram of the device for recycling light oil in this utility model is shown below. Figure 1 As shown by Figure 1It is known that the device for recycling light oil includes a buffer tank I1, a foaming agent evaporator 2, a mixer 3, an extraction tower 4, a distillation tower 5, a buffer tank II6, and a reboiler 7. The mixer 3 is equipped with a light oil inlet, and the buffer tank I1 is connected to the mixer 3 to provide foaming agent. The mixer 3 is connected to the lower inlet of the extraction tower 4. The top outlet of the extraction tower 4 is connected to the buffer tank II6, and the bottom outlet is connected to the upper inlet of the distillation tower 5. The top outlet of the distillation tower 5 is connected to the buffer tank II6, and the bottom outlet is the discharge port. The bottom of the distillation tower 5 is connected to the reboiler 7 to heat the condensate at the bottom of the distillation tower 5. The buffer tank I1 is equipped with a foaming agent inlet, and the foaming agent evaporator 2 is connected between the buffer tank I1 and the mixer 3 to heat the foaming agent. The reboiler 7 is connected to the foaming agent evaporator 2, and the condensate generated by the reboiler 7 provides heat to the foaming agent evaporator 2. The distillation tower 5 and the buffer tank II6 are connected to the condenser 8.

[0023] The mixer 3 is equipped with a stirrer 8. The lower end of the stirring paddle of the stirrer 8 in the mixer 3 is provided with a floating valve tray 9 to effectively guide the gaseous foaming agent into the equipment. The distance between the lower end of the stirring paddle and the floating valve tray 9 is 350mm. The extraction tower 4 is filled with polysaddle ring packing. The top of the extraction tower 4 is provided with an extractant inlet for adding extractant.

[0024] The present invention will be described below with reference to the accompanying drawings and specific embodiments. In the embodiments, the light oil has the following weight percentage composition: 77% light components, 20% cyclohexanone, and the balance being cyclohexanol, cyclohexane and a small amount of water.

[0025] Example 1

[0026] (1) Add light oil into mixer 3 through the light oil inlet of mixer 3. After adding to 800 mm, turn on the agitator (the diameter of the agitator is 1500 mm) to stir. The speed is controlled at 30 r / min.

[0027] (2) Add the foaming agent in the buffer tank I1 to the foaming agent evaporator 2. Heat the condensate at the bottom of the distillation column 5 through the reboiler 7 to provide heat for the foaming agent, so that the temperature of the foaming agent reaches 80°C, and the foaming agent becomes a gas phase and enters the mixer 3 through the floating valve plate 9 at the bottom of the mixer 3 (the height of the floating valve plate 9 is 300mm and the distance from the bottom of the agitator is 350mm).

[0028] (3) After the light oil and foaming agent are mixed, they enter the lower inlet of the extraction tower 4, and the extractant cyclohexanol is added through the extractant inlet at the top of the extraction tower 4. After thorough mixing, the cyclohexanol ketone is collected at the bottom outlet of the tower, and most of the light components are collected at the top outlet of the tower and enter the buffer tank II 6.

[0029] (4) In step (3), the cyclohexanone produced in the bottom of the extraction tower 4 enters the distillation tower 5 from the bottom outlet of the extraction tower 4 and the top inlet of the distillation tower 5. The azeotropic point of cyclohexanone is about 95℃, so the temperature of the bottom of the tower is controlled at 90℃. The cyclohexanone in the bottom of the tower enters the alcohol tower for recovery. The components at the top of the tower (water, trace light components and other impurities) are condensed by the condenser 8 and then enter the buffer tank II 6.

[0030] (5) The materials in buffer tank II6 are sold directly to external customers.

[0031] Although the specific embodiments of this patent have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this patent. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of this patent are still within the scope of protection of this patent.

Claims

1. An apparatus for recycling light oil, characterized in that, It includes buffer tank I (1), mixer (3), extraction column (4), distillation column (5), buffer tank II (6) and reboiler (7); The mixer (3) is equipped with a light oil inlet, and the buffer tank I (1) is connected to the mixer (3) to provide a foaming agent; The mixer (3) is connected to the lower inlet of the extraction tower (4); the top outlet of the extraction tower (4) is connected to the buffer tank II (6), and the bottom outlet of the tower is connected to the upper inlet of the distillation tower (5); the top outlet of the distillation tower (5) is connected to the buffer tank II (6), and the bottom outlet of the tower is the discharge port; The bottom of the distillation column (5) is connected to a reboiler (7) for heating the condensate at the bottom of the distillation column (5).

2. The apparatus for recycling light oil according to claim 1, characterized in that, The buffer tank I (1) is provided with a foaming agent inlet, and a foaming agent evaporator (2) is connected between the buffer tank I (1) and the mixer (3) for heating the foaming agent.

3. The apparatus for recycling light oil according to claim 2, characterized in that, The reboiler (7) is connected to the foaming agent evaporator (2), and the condensate generated by the reboiler (7) provides heat to the foaming agent evaporator (2).

4. The apparatus for recycling light oil according to claim 1, characterized in that, The mixer (3) is equipped with a stirrer (9).

5. The apparatus for recycling light oil according to claim 4, characterized in that, The mixer (3) has a floating valve tray (10) at the lower end of the agitator (9) of the mixer (3) to effectively guide the gaseous foaming agent into the equipment.

6. The apparatus for recycling light oil according to claim 5, characterized in that, The distance between the lower end of the agitator and the floating valve tray (10) is 350mm.

7. The apparatus for recycling light oil according to claim 1, characterized in that, The extraction tower (4) is filled with polysaddle ring packing.

8. The apparatus for recycling light oil according to claim 1, characterized in that, The top of the extraction tower (4) is equipped with an extractant inlet for adding extractant.

9. The apparatus for recycling light oil according to claim 1, characterized in that, A condenser (8) is connected between the distillation column (5) and the buffer tank II (6).

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