Crude benzene hydrogenation device

Abstract

The utility model relates to the field of chemical equipment, in particular to a crude benzene hydrogenation device. Comprising a kettle body, a jacket is fixed in the kettle body, a plurality of air holes are uniformly formed in the side wall, facing the center of the kettle body, of the jacket, a first inlet pipe is fixed on the kettle body, and the first inlet pipe is communicated with an annular cavity between the jacket and the side wall of the kettle body; an outer net cylinder is concentrically fixed in the kettle body on the inner side of the jacket, an inner net cylinder is concentrically fixed in the kettle body on the inner side of the outer net cylinder, a catalyst is filled between the outer net cylinder and the inner net cylinder, and a rotating pipe is rotationally arranged in the kettle body on the inner side of the inner net cylinder. Hydrogen can be discharged through the gas holes and the discharge holes and then uniformly dispersed into a crude benzene raw material in the kettle body, and the crude benzene hydrogenation efficiency can be improved by matching with rotary stirring of the rotating pipe, the blades, the branch pipes and the vertical pipe.

Description

Technical Field

[0001] The utility model relates to the field of chemical equipment, in particular to a crude benzene hydrogenation device. Background Art

[0002] Crude benzene is one of the products recovered during the purification of coke oven gas. Crude benzene is mainly composed of aromatic hydrocarbons such as benzene, toluene, and xylene, which are all important chemical raw materials. The main methods for refining crude benzene are pickling and hydrofining. Although the pickling method has a simple process flow and low equipment investment, it has serious environmental pollution and low product yield, and is basically facing elimination. The environmentally friendly hydrofining process technology is used to produce clean benzene aromatic chemical products using the light benzene fraction (<180℃ fraction) in crude benzene. It has been successfully applied in industrial equipment and has been operated for a long period of time. The product quality has reached the design requirements. In the existing crude benzene hydrofining process, the crude benzene raw material is first separated into light benzene and heavy benzene in a multi-stage evaporator, and then the light benzene is transported to the reactor and mixed with hydrogen for refining.

[0003] In the prior art, a patent document with application number CN202223137848.8 and titled "A Crude Benzene Hydrogenation Device" discloses a device that can filter the gas in the crude benzene hydrogenation device when it is discharged, so as to avoid the direct discharge of harmful gases after the reaction of crude benzene and hydrogen, and improve the operating safety of the staff during the crude benzene hydrogenation. However, in the actual production process, the tail gas generated by the crude benzene hydrogenation reaction will be sent to the tail gas treatment equipment. The tail gas contains a large amount of hydrogen. In order to reduce the production cost, the hydrogen in the tail gas needs to be reused. The tail gas treatment equipment is equipped with a filtering device, and the provision of a transition device on the exhaust pipe will cause repeated filtering of the tail gas, thereby affecting the flow rate of the tail gas.

[0004] The patent document with application number CN201820888277.6 and titled "A Crude Benzene Hydrogenation Process Reaction Device" discloses a device that can prevent deposits such as polymers and coke from accumulating on the surface of the catalyst, causing the activity of the catalyst to decrease and the efficiency of crude benzene refining to decrease. The device drives the rotating box and the catalyst inside it to rotate. Under the action of centrifugal force, deposits such as polymers and coke cannot accumulate on the surface of the catalyst, reducing the catalyst coking cycle and thus improving the utilization rate of the catalyst. However, the device needs to drive the rotating box and the catalyst inside it to rotate, so the motor is under heavy load and consumes high energy when working. Utility Model Content

[0005] The technical problem to be solved by the utility model is a crude benzene hydrogenation device which has low energy consumption, can reduce the amount of deposits such as polymers and coking accumulated on the catalyst surface, reduces the catalyst coking cycle, and thus improves the catalyst utilization rate.

[0006] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0007] A crude benzene hydrogenation device comprises a kettle body, a jacket is fixed in the kettle body, a plurality of air holes are evenly distributed on the side wall of the jacket facing the center of the kettle body, a first inlet pipe is fixed on the kettle body, the first inlet pipe is connected with the annular cavity between the jacket and the side wall of the kettle body; an outer mesh cylinder is concentrically fixed in the kettle body on the inner side of the jacket, an inner mesh cylinder is concentrically fixed in the kettle body on the inner side of the outer mesh cylinder, a catalyst is filled between the outer mesh cylinder and the inner mesh cylinder, a rotating tube is rotatably arranged in the kettle body inside the inner mesh cylinder, a fixed sleeve is fixed at the lower end of the kettle body, the lower end of the rotating tube is rotatably sealed and connected in the fixed sleeve, the rotating tube is connected with the second inlet pipe through the fixed sleeve, a motor is fixed at the upper end of the kettle body, the output shaft of the motor is fixedly connected to the upper end of the rotating tube, a plurality of vertical pipes parallel to the rotating tube are arranged on the inner side of the inner mesh cylinder, a plurality of rows of holes are evenly distributed along the axial direction of the vertical pipe on the side of the vertical pipe facing the inner mesh cylinder, the vertical pipe and the rotating pipe are fixedly connected through a plurality of branch pipes, and the branch pipes connect the rotating pipe and the vertical pipe.

[0008] Specifically, a material pipe is fixed on the kettle body, and the outlet end of the material pipe passes through the jacket and then extends to the kettle body outside the outer net cylinder.

[0009] Specifically, the upper end of the kettle body is fixedly connected with a tail gas pipe.

[0010] Specifically, a supply pipe is fixed at the upper end of the kettle body, and a discharge pipe is fixed at the lower end of the kettle body. Both the supply pipe and the discharge pipe are communicated with the annular cavity between the inner net cylinder and the outer net cylinder.

[0011] Specifically, a plurality of blades are fixed on the outer side of the rotating tube.

[0012] Specifically, an outlet pipe is fixed at the lower end of the kettle body, and the annular cavity between the jacket and the outer net cylinder is connected with the outlet pipe.

[0013] Specifically, the plurality of vertical pipes are evenly distributed according to the circumference of the axis of the rotating pipe.

[0014] Specifically, valves are installed on the first inlet pipe and the second inlet pipe, and the inlet ends of the first inlet pipe and the second inlet pipe are fixedly connected to the manifold.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model provides a jacket and opens air holes on the jacket. At the same time, a vertical pipe connected to the rotating pipe is provided and a discharge hole is provided on the vertical pipe. During the crude benzene hydrogenation process, hydrogen can be discharged through the air holes and the discharge holes and then evenly dispersed into the crude benzene raw material in the kettle body. The rotating stirring of the rotating pipe, blades, branch pipes and vertical pipe can improve the efficiency of crude benzene hydrogenation.

[0017] 2. During the hydrogenation process of crude benzene, the first inlet pipe can be closed so that hydrogen is discharged only through the discharge holes on the riser. The hydrogen discharged from the discharge holes can flush the catalyst with the crude benzene raw material in the kettle, which can reduce the amount of deposits such as polymers and coking accumulated on the catalyst surface, reduce the catalyst coking cycle, and thus improve the utilization rate of the catalyst.

[0018] 3. The crude benzene raw material can enter the kettle body through the second inlet pipe, the rotating pipe, the branch pipe, the vertical pipe and the discharge hole. When the crude benzene raw material is discharged from the discharge hole, the motor is driven, and the motor can drive the rotating pipe, the branch pipe and the vertical pipe to rotate. The crude benzene raw material discharged from the discharge hole can flush the catalyst between the outer mesh cylinder and the inner mesh cylinder, which can reduce the amount of polymer, coke and other deposits accumulated on the catalyst surface, and can ensure the efficiency of subsequent crude benzene hydrogenation.

[0019] 4. By setting up adding pipes and draining pipes, it is convenient to replace the catalyst between the inner net cylinder and the outer net cylinder.

[0020] 5. The branch pipes and vertical pipes can improve the stirring efficiency of the crude benzene raw material as the rotating pipe rotates. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional view of the device.

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the kettle body.

[0023] Figure 3 A partial cross-sectional view of the connection between the transfer pipe, branch pipe and riser.

[0024] The names of the parts in the attached drawings are:

[0025] 1 Kettle

[0026] 2 Jacket

[0027] 201 Stoma

[0028] 3. Outer net tube

[0029] 4 Catalyst

[0030] 5 Inner net tube

[0031] 6 Add tube

[0032] 7. Pipeline

[0033] 8 Exhaust pipe

[0034] 9 Outlet

[0035] 10 First inlet pipe

[0036] 11 Second inlet pipe

[0037] 12. Exchange pipe

[0038] 13 Transfer

[0039] 14 Motor

[0040] 15 blades

[0041] 16 Fixed sleeve

[0042] 17 Branch pipe

[0043] 18 Riser

[0044] 181 holes

[0045] 19 Material tube. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0047] Embodiment 1:

[0048] Reference Figure 1-Figure 3 As shown, a crude benzene hydrogenation device comprises a kettle body 1, and the upper end of the kettle body 1 is fixedly connected with a tail gas pipe 8. The tail gas pipe 8 is connected to a tail gas treatment device.

[0049] The lower end of the kettle body 1 is fixed with an outlet pipe 9, and the annular cavity between the jacket 2 and the outer net tube 3 is connected with the outlet pipe 9. After the hydrogenation of crude benzene is completed, the material in the kettle body 1 can be discharged through the outlet pipe 9.

[0050] A jacket 2 is fixed inside the kettle body 1 , and a plurality of air holes 201 are evenly distributed on the side wall of the jacket 2 facing the center of the kettle body 1 . A first inlet pipe 10 is fixed on the kettle body 1 , and the first inlet pipe 10 is connected to the annular cavity between the jacket 2 and the side wall of the kettle body 1 .

[0051] The hydrogen can enter between the jacket 2 and the side wall of the kettle body 1 through the first inlet pipe 10 , and then the hydrogen between the side wall of the kettle body 1 and the jacket 2 can be dispersed into the kettle body 1 through the plurality of pores 201 .

[0052] A feed pipe 19 is fixed on the kettle body 1, and the outlet end of the feed pipe 19 passes through the jacket 2 and extends into the kettle body 1 outside the outer net cylinder 3. The crude benzene raw material can be added into the kettle body 1 through the feed pipe 19.

[0053] An outer net cylinder 3 is concentrically fixed in the kettle body 1 inside the jacket 2, an inner net cylinder 5 is concentrically fixed in the kettle body 1 inside the outer net cylinder 3, and a catalyst 4 is filled between the outer net cylinder 3 and the inner net cylinder 5. After the crude benzene raw material enters the kettle body 1, it can pass through the inner net cylinder 5 and the outer net cylinder 3 and contact the catalyst 4.

[0054] A rotating tube 13 is rotatably arranged in the kettle body 1 inside the inner net cylinder 5, a fixing sleeve 16 is fixed at the lower end of the kettle body 1, the lower end of the rotating tube 13 is rotatably sealed and connected in the fixing sleeve 16, and the rotating tube 13 is connected with the second inlet pipe 11 through the fixing sleeve 16. A motor 14 is fixed at the upper end of the kettle body 1, and the output shaft of the motor 14 is fixedly connected to the upper end of the rotating tube 13. When the motor 14 drives the rotating tube 13 to rotate, hydrogen can enter the rotating tube 13 through the second inlet pipe 11.

[0055] A plurality of blades 15 are fixed on the outer side of the rotating tube 13. When the rotating tube 13 rotates, the blades 15 can stir the crude benzene raw material in the kettle body 1, so that the crude benzene raw material is fully contacted with the catalyst 4.

[0056] A plurality of vertical pipes 18 parallel to the rotating tube 13 are arranged inside the inner net tube 5, and the plurality of vertical pipes 18 are evenly arranged according to the circumference of the axis of the rotating tube 13. A plurality of row holes 181 are evenly arranged along the axial direction of the vertical pipe 18 on one side of the vertical pipe 18 facing the inner net tube 5, and the vertical pipe 18 is fixedly connected to the rotating tube 13 through a plurality of branch pipes 17, and the branch pipes 17 connect the rotating tube 13 and the vertical pipe 18. The hydrogen entering the rotating tube 13 can enter the vertical pipe 18 through the branch pipes 17, and the hydrogen in the vertical pipe 18 can be discharged through the row holes 181 and dispersed into the crude benzene raw material in the kettle body 1.

[0057] Valves are installed on the first inlet pipe 10 and the second inlet pipe 11 , and the inlet ends of the first inlet pipe 10 and the second inlet pipe 11 are fixedly connected to the manifold 12 .

[0058] During operation, crude benzene can be added into the kettle body 1 through the material pipe 19, and then hydrogen is introduced into the manifold 12. The hydrogen enters between the jacket 2 and the kettle body 1 through the first inlet pipe 10 and is dispersed and discharged into the crude benzene in the kettle body 1 through multiple air holes 201. At the same time, the motor 14 is started, and the motor 14 drives the rotating tube 13, the blades 15, the branch pipe 17 and the vertical pipe 18 to rotate. The hydrogen passes through the second inlet pipe 11, the fixed sleeve 16, the rotating tube 13, the branch pipe 17 and the vertical pipe 18 and is discharged through the discharge hole 181. In the process of the vertical pipe 18 rotating around the rotating tube 13, the hydrogen discharged from the discharge hole 181 is dispersed into the crude benzene in the kettle body 1. The rotation of the rotating tube 13, the blades 15, the branch pipe 17 and the vertical pipe 18 can stir the crude benzene in the kettle body 1. Under the catalytic action of the catalyst 4, the crude benzene hydrogenation process is completed in the kettle body 1.

[0059] By providing a jacket 2 and opening an air hole 201 on the jacket 2, and at the same time, providing a vertical pipe 18 connected to the rotating pipe 13 and providing a discharge hole 181 on the vertical pipe 18, during the crude benzene hydrogenation process, hydrogen can be discharged through the air hole 201 and the discharge hole 181 and then evenly dispersed into the crude benzene raw material in the kettle body 1. The rotating stirring of the rotating pipe 13, the blades 15, the branch pipe 17 and the vertical pipe 18 can improve the efficiency of the crude benzene hydrogenation.

[0060] During the hydrogenation process of crude benzene, the first inlet pipe 10 can be closed so that hydrogen is discharged only through the discharge holes 181 on the riser 18. The hydrogen discharged from the discharge holes 181 can allow the crude benzene raw material in the kettle body 1 to flush the catalyst 4, which can reduce the amount of deposits such as polymers and coke accumulated on the surface of the catalyst 4, reduce the coking cycle of the catalyst 4, and thus improve the utilization rate of the catalyst 4.

[0061] When the crude benzene raw material is added to the kettle body 1, the first inlet pipe 10 can be closed, and the crude benzene raw material can enter the kettle body 1 through the second inlet pipe 11, the rotating pipe 13, the branch pipe 17, the vertical pipe 18 and the row hole 181. After the crude benzene raw material is discharged from the row hole 181, the motor 14 is driven, and the motor 14 can drive the rotating pipe 13, the blades 15, the branch pipe 17 and the vertical pipe 18 to rotate. The crude benzene raw material discharged from the row hole 181 can flush the catalyst 4 between the outer net tube 3 and the inner net tube 5, and can also reduce the amount of deposits such as polymers and coke accumulated on the surface of the catalyst 4, which can ensure the efficiency of subsequent crude benzene hydrogenation.

[0062] Embodiment 2:

[0063] Based on Example 1, refer to Figure 1 As shown, a supply pipe 6 is fixed to the upper end of the kettle body 1, and a discharge pipe 7 is fixed to the lower end of the kettle body 1, and both the supply pipe 6 and the discharge pipe 7 are connected to the annular cavity between the inner net tube 5 and the outer net tube 3. By providing the supply pipe 6 and the discharge pipe 7, it is convenient to replace the catalyst 4 between the inner net tube 5 and the outer net tube 3.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A crude benzene hydrogenation device, comprising a kettle (1), characterized in that: A jacket (2) is fixed inside the kettle body (1), and a plurality of air holes (201) are evenly distributed on the side wall of the jacket (2) facing the center of the kettle body (1). A first inlet pipe (10) is fixed on the kettle body (1), and the first inlet pipe (10) is connected to the annular cavity between the jacket (2) and the side wall of the kettle body (1); an outer net tube (3) is concentrically fixed inside the kettle body (1) inside the jacket (2), an inner net tube (5) is concentrically fixed inside the kettle body (1) inside the outer net tube (3), a catalyst (4) is filled between the outer net tube (3) and the inner net tube (5), a rotating tube (13) is rotatably arranged inside the kettle body (1) inside the inner net tube (5), and a fixed sleeve (16) is fixed at the lower end of the kettle body (1). ), the lower end of the rotating tube (13) is rotatably sealed and connected in a fixed sleeve (16), the rotating tube (13) is connected to the second inlet pipe (11) through the fixed sleeve (16), a motor (14) is fixed to the upper end of the kettle body (1), the output shaft of the motor (14) is fixedly connected to the upper end of the rotating tube (13), a plurality of vertical tubes (18) parallel to the rotating tube (13) are arranged on the inner side of the inner net cylinder (5), a plurality of rows of holes (181) are evenly distributed along the axial direction of the vertical tube (18) on one side of the vertical tube (18) facing the inner net cylinder (5), the vertical tube (18) and the rotating tube (13) are fixedly connected through a plurality of branch tubes (17), and the branch tubes (17) connect the rotating tube (13) and the vertical tube (18).

2. A crude benzene hydrogenation device according to claim 1, characterized in that: A material pipe (19) is fixed on the kettle body (1), and the outlet end of the material pipe (19) passes through the jacket (2) and extends into the kettle body (1) outside the outer net cylinder (3).

3. A crude benzene hydrogenation device according to claim 1, characterized in that: The upper end of the kettle body (1) is fixedly connected to a tail gas pipe (8).

4. A crude benzene hydrogenation device according to claim 1, characterized in that: A supply pipe (6) is fixed at the upper end of the kettle body (1), and a discharge pipe (7) is fixed at the lower end of the kettle body (1). Both the supply pipe (6) and the discharge pipe (7) are connected to the annular cavity between the inner net cylinder (5) and the outer net cylinder (3).

5. A crude benzene hydrogenation device according to claim 1, characterized in that: A plurality of blades (15) are fixed on the outer side of the rotating tube (13).

6. A crude benzene hydrogenation device according to claim 1, characterized in that: An outlet pipe (9) is fixed at the lower end of the kettle body (1), and the annular cavity between the jacket (2) and the outer net cylinder (3) is connected to the outlet pipe (9).

7. A crude benzene hydrogenation device according to claim 1, characterized in that: The plurality of vertical pipes (18) are evenly distributed around the circumference of the axis of the rotating pipe (13).

8. A crude benzene hydrogenation device according to claim 1, characterized in that: Valves are installed on both the first inlet pipe (10) and the second inlet pipe (11), and the inlet ends of the first inlet pipe (10) and the second inlet pipe (11) are fixedly connected to the manifold (12).

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