Device for producing industrial white oil by hydrocracking diesel oil

Abstract

The utility model discloses a device for producing industrial white oil by hydrocracking diesel oil. Comprising a hydrocracking device and a fractionating tower, the hydrocracking device comprises a hydrofining reactor and a cracking reactor which are sequentially connected in series, the outlet of the cracking reactor is communicated with the inlet of a stripping tower, the bottom of the stripping tower is connected with the inlet of the fractionating tower, the number of tower plates of the fractionating tower is 50-60, and the inlet is formed in the 30th-32th tower plates of the fractionating tower. A cooling device is arranged at the top of the fractionating tower, a reboiling device is arranged at the bottom of the fractionating tower, and the side wall of the 27th-29th layer of the fractionating tower is communicated with the cracking reactor through a pipeline; a white oil outlet is formed in the bottom of the fractionating tower. The purposes of increasing the flash point, reducing the aromatic hydrocarbon content and improving the viscosity of the tail oil of the diesel oil hydrocracking device are achieved, the tail oil can serve as a 5 # white oil blending component, the product variety is increased, the product additional value is high, and the product income of enterprises is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of petrochemical industry, and specifically relates to a device for producing industrial white oil by diesel hydrocracking. Background Art

[0002] The diesel hydrocracking unit is an important part of the petrochemical unit. It mainly processes straight-run diesel from the atmospheric and vacuum unit and diesel from the residue oil hydrocracking unit. Its main products include liquefied gas, light naphtha, heavy naphtha, diesel products, etc. The products of the existing diesel hydrocracking units in the chemical industry have problems such as large output, market saturation, and fierce competition. It is necessary to innovate and produce new products to increase product added value. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a device for producing industrial white oil by diesel hydrocracking. The utility model realizes the increase of new product 5# white oil component by diesel hydrocracking, increases the diversity of device products, makes product structure flexible to adjust, and improves product added value.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a device for producing industrial white oil by hydrocracking of diesel. The device mainly comprises a hydrocracking device and a fractionating tower. The hydrocracking device comprises a hydrofining reactor and a cracking reactor which are sequentially connected in series. The outlet of the cracking reactor is connected with the inlet of a stripping tower. The bottom of the stripping tower is connected with the inlet of the fractionating tower. The number of plates of the fractionating tower is 50-60. The inlet position is arranged at the 30th to 32nd plates of the fractionating tower. The top of the fractionating tower is provided with a cooling device. The bottom of the fractionating tower is provided with a reboiling device. The side wall of the 27th to 29th layers of the fractionating tower is connected with the cracking reactor through a pipeline. The bottom of the fractionating tower is provided with a white oil outlet.

[0006] Based on the above technical solution, further, the types of tower plates of the distillation tower include bubble tower plates, sieve plate tower plates, floating valve tower plates and tongue-shaped tower plates.

[0007] Based on the above technical solution, further, the number of plates of the distillation tower is 54.

[0008] Based on the above technical solution, further, the inlet position is set at the 30th tray of the distillation tower.

[0009] Based on the above technical solution, further, the side wall of the 29th layer of the distillation tower is connected to the cracking reactor through a pipeline.

[0010] Based on the above technical solution, further, a pump and a check valve are provided on the pipeline between the side wall of the 29th layer of the distillation tower and the cracking reactor.

[0011] Based on the above technical solution, further, a flow control valve is provided on the white oil outlet.

[0012] Compared with the prior art, the utility model achieves the following beneficial effects:

[0013] The utility model realizes the purpose of increasing the flash point, reducing the aromatic content and increasing the viscosity of the tail oil of the diesel hydrocracking unit. The tail oil can be used as a 5# white oil blending component, which increases the product variety, has high product added value and improves the product income of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to clearly illustrate the embodiments of the present utility model, the drawings related to the embodiments will be briefly introduced below.

[0015] Figure 1 It is a schematic diagram of the utility model, wherein 1-hydrocracking unit, 2-fractionation tower, 3-hydrogenation refining reactor, 4-cracking reactor, 5-air cooling device, 6-reboiling device, 7-pump, 8-check valve, 9-white oil outlet, and 10-control valve. DETAILED DESCRIPTION

[0016] The present invention is described in detail below in conjunction with embodiments, but the implementation methods of the present invention are not limited thereto. Obviously, the embodiments described below are only partial embodiments of the present invention. For those skilled in the art, other similar embodiments obtained without creative labor all fall within the protection scope of the present invention.

[0017] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "front", "back", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] Example 1

[0019] The utility model provides a device for producing industrial white oil by hydrocracking of diesel, such as Figure 1As shown, it mainly includes a hydrocracking unit 1 and a fractionation tower 2. The hydrocracking unit includes a hydrofining reactor 3 and a cracking reactor 4 which are connected in series in sequence. The outlet of the cracking reactor 4 is connected to the inlet of the stripping tower. The bottom of the stripping tower is connected to the inlet of the fractionation tower 2. The fractionation tower is a fractionation tower with 54 plates (1, 2, 3, ... 54 layers from top to bottom). The inlet position is set at the 30th plate of the fractionation tower. The top of the fractionation tower is provided with an air cooling device 5. The bottom of the fractionation tower is provided with a reboiling device 6. The side wall of the 29th layer of the fractionation tower is connected to the cracking device through a pipeline. Reactor 4 is connected to carry out cracking, replacing the cracking of the unconverted oil at the bottom of the original distillation tower (before the transformation, the liquid phase of the 29th layer is returned to the 30th layer of the tower plate by gravity outside the tower. There are two kinds of products of the distillation tower. The top of the tower produces heavy naphtha and below components, and the bottom of the tower produces components above heavy naphtha. Most of the components at the bottom of the tower are returned to the cracking reactor for further cracking, and a part is sent out as products); a pump 7 and a check valve 8 are arranged on the pipeline between the side wall of the 29th layer of the distillation tower and the cracking reactor 4; a white oil outlet 9 is arranged at the bottom of the distillation tower, and a flow control valve 10 is arranged on the white oil outlet.

[0020] The operation process of the diesel hydrocracking device for producing white oil of the utility model is as follows: the raw oil first enters the hydrofining reactor 3 for hydrogenation, and then enters the cracking reactor 4 for cracking, the reaction product enters the stripping tower, the bottom product enters the fractionating tower from the 30th tower plate of the fractionating tower, the gas-liquid phase is fully contacted in the tower, and the separation of materials is achieved, the material is extracted from the side wall of the 29th floor of the fractionating tower, and enters the cracking reactor 4 through a pipeline to continue cracking, and the tail oil flowing out from the bottom of the fractionating tower can meet the requirements of 5# industrial white oil, so as to obtain 5# industrial white oil.

[0021] Table 1 Process parameters of distillation tower

[0022]

[0023]

[0024] Table 2 Comparison of properties of distillation tower tail oil before and after transformation

[0025] project Raw tail oil properties Tail oil properties after transformation <![CDATA[Kinematic viscosity (40 °C) mm 2 / s]]> 2.046 3.324 Flash point (open), ℃ 78 130 Pour point, ℃ -15 -3 Aromatic content, % 6.1 1.3 <![CDATA[Density, kg / m 3 > 792 800 Initial distillation point, ℃ 195 244 Final distillation point, ℃ 345 361

[0026] As shown in Table 2, after the transformation, the viscosity of the tail oil of the distillation tower increased from 2.046 to 3.324 mm 2 / s, the flash point increased from 78℃ to 130℃, and the aromatic content decreased from 6.1% to 1.3%, meeting the requirements of 5# industrial white oil.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A device for producing industrial white oil by diesel hydrocracking, characterized in that: It mainly includes a hydrocracking unit and a fractionating tower. The hydrocracking unit includes a hydrorefining reactor and a cracking reactor which are connected in series in sequence. The outlet of the cracking reactor is connected to the inlet of the stripping tower. The bottom of the stripping tower is connected to the inlet of the fractionating tower. The number of plates of the fractionating tower is 50-60. The inlet position is set at the 30th to 32nd plate of the fractionating tower. A cooling device is set at the top of the fractionating tower. A reboiling device is set at the bottom of the fractionating tower. The side wall of the 27th to 29th layer of the fractionating tower is connected to the cracking reactor through a pipeline. A white oil outlet is set at the bottom of the fractionating tower.

2. The device for producing industrial white oil by diesel hydrocracking according to claim 1, characterized in that: The types of plates of the fractionating tower include bubble cap plates, sieve plate plates, valve plates and tongue-shaped plates.

3. The device for producing industrial white oil by diesel hydrocracking according to claim 1, characterized in that: The fractionation tower has 54 plates.

4. The device for producing industrial white oil by diesel hydrocracking according to claim 3, characterized in that: The inlet position of the distillation tower is set at the 30th tray of the distillation tower.

5. The device for producing industrial white oil by diesel hydrocracking according to claim 4, characterized in that: The side wall of the 29th layer of the fractionation tower is connected to the cracking reactor through a pipeline.

6. The device for producing industrial white oil by diesel hydrocracking according to claim 5, characterized in that: A pump and a check valve are provided on the pipeline between the side wall of the 29th layer of the distillation tower and the cracking reactor.

7. The device for producing industrial white oil by diesel hydrocracking according to claim 1, characterized in that: A flow control valve is provided on the white oil outlet.

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