A maleic anhydride synthesis absorption device

Abstract

The utility model relates to a maleic anhydride synthesis absorption device, which includes a fixed bed reactor, a heat exchanger and an absorption device. The maleic anhydride-containing mixed gas obtained after the reaction contains a certain amount of heat. The maleic anhydride-containing mixed gas is introduced into the heat exchanger through an exhaust pipe to cool the mixed gas, so that the maleic anhydride gas can be liquefied and then refluxed into the absorption box through the exhaust pipe, so that the maleic anhydride in the mixed gas is fully absorbed, and the content of maleic anhydride in the mixed gas is reduced to the greatest extent. Moreover, the heat carried in the mixed gas can be used to heat the low-temperature water introduced into the heat exchanger, so as to make full use of the heat.

Description

Technical Field

[0001] The utility model belongs to the technical field of maleic anhydride production, in particular to a maleic anhydride synthesis absorption device. Background Art

[0002] Maleic anhydride, also known as maleic anhydride, is a commonly used important organic chemical raw material. The main production method of maleic anhydride is the n-butane oxidation method. The n-butane method uses n-butane as the raw material, and the n-butane gas is mixed with air and enters a fixed bed tubular reactor to undergo a catalytic partial oxidation reaction to generate maleic anhydride. The maleic anhydride-containing mixed gas generated by the oxidation reaction is recovered in the maleic anhydride recovery section. At present, most industrial maleic anhydride recovery processes use a solvent absorption method to absorb maleic anhydride in the gas phase to generate a solution, and the mixed gas is passed into a solvent during use, but there is a problem of insufficient absorption of maleic anhydride during the absorption process. Therefore, there are still shortcomings and deficiencies in the prior art. Utility Model Content

[0003] The utility model aims to provide a maleic anhydride synthesis absorption device to solve the above problems.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is:

[0005] Provided is a maleic anhydride synthesis absorption device, comprising a fixed bed reactor, a heat exchanger and an absorption device, wherein the fixed bed reactor is connected to the absorption device, the absorption device is connected to the heat exchanger, the absorption device comprises an absorption box, a feeding pump is arranged on the side of the absorption box, a feeding pipe is arranged on the feeding pump, one end of the feeding pipe extends into the absorption box, a discharge pipe is connected to the bottom of the side of the absorption box, the discharge pipe is connected to the inside of the absorption box, a valve is installed on the discharge pipe, the absorption box is also installed with a material pump, and the material pump is respectively connected with a feed pipe and a discharge pipe, The feed pipe and the discharge pipe are respectively connected to the absorption box, and the connection between the feed pipe and the absorption box is located at the bottom of the side of the absorption box. The end of the discharge pipe away from the material pump passes through the side wall of the absorption box and extends into the absorption box. The end of the discharge pipe located in the absorption box is fixedly connected to a distribution plate, and the distribution plate is hollow. The discharge pipe is connected to the inside of the distribution plate. A plurality of nozzles are installed on the side of the distribution plate away from the discharge pipe. The top of the absorption box is connected to a vertically arranged exhaust pipe, and the absorption device is connected to the heat exchanger through the exhaust pipe.

[0006] Furthermore, a discharge port is provided at the top of the heat exchanger, a feed port is provided at the bottom of the heat exchanger, two connecting pipes are provided on the side of the heat exchanger, the connecting pipes are connected to the inside of the heat exchanger, the two connecting pipes are arranged along the height direction on the heat exchanger, and a regulating valve is provided on one of the two connecting pipes located close to the upper side of the heat exchanger, and two tube sheets are provided inside the heat exchanger, and the two tube sheets are arranged sequentially from top to bottom inside the heat exchanger.

[0007] Furthermore, a plurality of through holes are provided on the tube sheet, and the plurality of through holes on the two tube sheets correspond one to one. A branch pipe is also provided inside the heat exchanger, and the top end of the branch pipe is provided in the through hole of the upper tube sheet, and the bottom end of the branch pipe is provided in the through hole of the lower tube sheet, and the branch pipe is provided vertically.

[0008] Furthermore, the fixed bed reactor and the absorption device are connected together through a first feed pipe.

[0009] Furthermore, the two connecting pipes are located on the heat exchanger between the two tube sheets.

[0010] Furthermore, a temperature sensor is installed inside the heat exchanger, and the temperature sensor is arranged on the inner wall of the heat exchanger.

[0011] Furthermore, the temperature sensor is located between the two tube sheets.

[0012] Furthermore, the tube sheet is arranged horizontally, and two tube sheets are fixedly arranged on the inner wall of the heat exchanger.

[0013] By adopting the above technical solution, the beneficial effects of the utility model are:

[0014] The maleic anhydride synthesis absorption device of the utility model includes a fixed bed reactor, a heat exchanger and an absorption device. The maleic anhydride mixed gas obtained after the reaction contains a certain amount of heat. The maleic anhydride mixed gas is introduced into the heat exchanger through the exhaust pipe to cool the mixed gas, so that the maleic anhydride gas can be liquefied and then refluxed into the absorption box through the exhaust pipe, so that the maleic anhydride in the mixed gas is fully absorbed, and the content of maleic anhydride in the mixed gas is reduced to the greatest extent. Moreover, the heat carried in the mixed gas can be used to heat the low-temperature water introduced into the heat exchanger, so as to make full use of the heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the maleic anhydride synthesis absorption device provided by the utility model.

[0016] Figure 2 for Figure 1 Schematic diagram of the internal structure of the heat exchanger.

[0017] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the absorption device.

[0018] Figure numerals: 10, fixed bed reactor; 11, feeding pipe; 12, first feed pipe; 20, heat exchanger; 21, discharge port; 22, feed port; 23, connecting pipe; 234, regulating valve; 24, tube sheet; 241, through hole; 25, branch pipe; 26, temperature sensor; 30, absorption device; 31, absorption box; 32, feeding pump; 321, feeding pipe; 33, second feed pipe; 34, material pump; 341, feed pipe; 342, discharge pipe; 343, distribution plate; 344, nozzle; 35, discharge pipe; 351, valve; 36, exhaust pipe. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model is now described in detail in conjunction with the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basics of the utility model in a schematic manner, so it only shows the structure related to the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] like Figure 1 As shown, the utility model provides a maleic anhydride synthesis absorption device, which uses n-butane as raw material. After the n-butane is gasified, it is mixed with air and enters a fixed bed tubular reactor to undergo a catalytic partial oxidation reaction to generate maleic anhydride. The maleic anhydride-containing mixed gas generated by the maleic anhydride oxidation reaction is recovered in the maleic anhydride recovery section.

[0021] like Figure 1 As shown, the maleic anhydride synthesis absorption device provided by the utility model includes a fixed bed reactor 10 , a heat exchanger 20 and an absorption device 30 , wherein the fixed bed reactor 10 is connected to the absorption device 30 , and the absorption device 30 is connected to the heat exchanger 20 .

[0022] like Figure 1 As shown, a feeding pipe 11 is provided on the side of the fixed bed reactor 10, and n-butane and air are introduced into the fixed bed reactor 10 through the feeding pipe 11, so that a catalytic partial oxidation reaction occurs in the fixed bed reactor 10 to generate maleic anhydride. The fixed bed reactor 10 and the absorption device 30 are connected together through a first feed pipe 12.

[0023] like Figure 3As shown, the absorption device 30 includes an absorption box 31, a feeding pump 32 is arranged on the side of the absorption box 31, and a feeding pipe 321 is arranged on the feeding pump 32, and one end of the feeding pipe 321 extends into the interior of the absorption box 31. Through such an arrangement, it is convenient to add a solvent for absorbing maleic anhydride gas to the absorption box 31 through the feeding pump 32. In this embodiment, the solvent can be water. A discharge pipe 35 is connected to the bottom of the side of the absorption box 31, and the discharge pipe 35 is connected to the interior of the absorption box 31. A valve 351 is installed on the discharge pipe 35, and the maleic anhydride mixed gas can be discharged through the discharge pipe 35 after being absorbed in the solvent.

[0024] like Figure 3 As shown, a material pump 34 is also installed on the absorption box 31, and a feed pipe 341 and a discharge pipe 342 are respectively connected to the material pump 34. The feed pipe 341 and the discharge pipe 342 are respectively connected to the absorption box 31, and the connection between the feed pipe 341 and the absorption box 31 is located at the bottom of the side of the absorption box 31.

[0025] One end of the discharge pipe 342 away from the material pump 34 passes through the side wall of the absorption box 31 and extends into the absorption box 31. One end of the discharge pipe 342 located in the absorption box 31 is fixedly connected to a distribution plate 343. The distribution plate 343 is hollow, and the discharge pipe 342 is communicated with the inside of the distribution plate 343. A plurality of nozzles 344 are installed on the side of the distribution plate 343 away from the discharge pipe 342. The solvent absorbed by the maleic anhydride mixed gas located at the bottom of the absorption box 31 enters the distribution plate 343 through the feed pipe 341 and the discharge pipe 342 in sequence under the transportation of the material pump 34, and finally re-enters the absorption box 31 through the plurality of nozzles 344, so that the maleic anhydride mixed gas is fully in contact with the sprayed solvent, so that the maleic anhydride mixed gas is fully dissolved in the solvent, thereby reducing the amount of solvent used and avoiding waste.

[0026] like Figure 3 As shown, a vertically arranged exhaust pipe 36 is connected to the top of the absorption box 31 , the bottom of the exhaust pipe 36 extends into the absorption box 31 , and the top of the exhaust pipe 36 is connected to the heat exchanger 20 .

[0027] like Figure 2 As shown, a discharge port 21 is provided at the top of the heat exchanger 20, a feed port 22 is provided at the bottom of the heat exchanger 20, two connecting pipes 23 are provided on the side of the heat exchanger 20, the connecting pipes 23 are connected with the inside of the heat exchanger 20, the two connecting pipes 23 are arranged along the height direction on the heat exchanger 20, and the two connecting pipes 23 are respectively used for water input and water outflow, wherein the connecting pipe 23 located at the upper part of the heat exchanger 20 is used for water input, and the connecting pipe 23 located at the lower part of the heat exchanger 20 is used for water outflow.

[0028] A regulating valve 234 is provided on one of the two connecting pipes 23 located near the upper side of the heat exchanger 20. Two tube sheets 24 are provided inside the heat exchanger 20. The two tube sheets 24 are arranged in sequence from top to bottom inside the heat exchanger 20. The tube sheets 24 are arranged horizontally. The two tube sheets 24 are fixedly arranged on the inner wall of the heat exchanger 20. A plurality of through holes 241 are opened on the tube sheet 24. The plurality of through holes 241 on the two tube sheets 24 correspond to each other one by one. A branch pipe 25 is also provided inside the heat exchanger 20. The top end of the branch pipe 25 is arranged in the through hole 241 of the upper tube sheet 24, and the bottom end of the branch pipe 25 is arranged in the through hole 241 of the lower tube sheet 24. The branch pipe 25 is arranged vertically.

[0029] The two connecting pipes 23 are located between the two tube sheets 24 on the heat exchanger 20 . A temperature sensor 26 is also installed inside the heat exchanger 20 . The temperature sensor 26 is arranged on the inner wall of the heat exchanger 20 . The temperature sensor 26 is located between the two tube sheets 24 .

[0030] The maleic anhydride-containing mixed gas obtained after the reaction contains a certain amount of heat. The mixed gas containing maleic anhydride is introduced into the heat exchanger 20 through the exhaust pipe 36 to cool the mixed gas, so that the maleic anhydride gas can be liquefied and then refluxed into the absorption box 31 through the exhaust pipe 36, so that the maleic anhydride in the mixed gas is fully absorbed, and the content of maleic anhydride in the mixed gas is reduced to the greatest extent. In addition, the heat carried in the mixed gas can be used to heat the low-temperature water introduced into the heat exchanger 20, thereby making full use of the heat. The reaction temperature in the fixed bed reactor 10 is 350-400°C. The temperature of the maleic anhydride-containing mixed gas obtained after the reaction is approximately about 350°C. After a portion of the maleic anhydride in the mixed gas is absorbed by the solvent in the absorption device 30, the remaining mixed gas enters the heat exchanger 20 through the exhaust pipe 36. The mixed gas is cooled by heat exchange in the heat exchanger 20. On the one hand, the temperature of the introduced mixed gas is reduced to below the boiling point of the maleic anhydride gas, that is, the temperature of the mixed gas is reduced to below 202°C, so that the maleic anhydride in the mixed gas changes from gas to liquid, and then flows back into the absorption box 31 through the exhaust pipe 36, so that the maleic anhydride in the mixed gas is fully absorbed to reduce waste; on the other hand, the heat carried in the mixed gas can be utilized by the heat exchange effect of the heat exchanger 20, and water can be heated by heat exchange to reduce costs.

[0031] The maleic anhydride synthesis absorption device provided by the utility model comprises a fixed bed reactor 10, a heat exchanger 20 and an absorption device 30, the maleic anhydride mixed gas generated by the reaction enters the absorption device 30, a material pump 34 is installed on the absorption box 31, and a feed pipe 341 and a discharge pipe 342 are respectively connected to the material pump 34, the feed pipe 341 and the discharge pipe 342 are respectively connected to the absorption box 31, and one end of the discharge pipe 342 located in the absorption box 31 is fixedly connected to a distribution plate 343, the distribution plate 343 is hollow, and the discharge pipe 341 is connected to the absorption box 31. 42 is connected with the inside of the distribution plate 343. A plurality of nozzles 344 are installed on the side of the distribution plate 343 away from the discharge pipe 342. The solvent absorbed by the maleic anhydride mixed gas at the bottom of the absorption box 31 enters the distribution plate 343 through the feed pipe 341 and the discharge pipe 342 in sequence under the transportation of the material pump 34, and finally re-enters the absorption box 31 through the plurality of nozzles 344, so that the maleic anhydride mixed gas is fully in contact with the sprayed solvent, so that the maleic anhydride mixed gas is fully dissolved in the solvent, thereby reducing the amount of solvent used and avoiding waste.

[0032] The reaction temperature in the fixed bed reactor 10 is 350-400°C, and the temperature of the maleic anhydride-containing mixed gas obtained after the reaction is approximately around 350°C. After a portion of the maleic anhydride in the mixed gas is absorbed by the solvent in the absorption device 30, the remaining mixed gas enters the heat exchanger 20 through the exhaust pipe 36. The mixed gas is cooled by heat exchange in the heat exchanger 20. On the one hand, the temperature of the introduced mixed gas is reduced to below the boiling point of the maleic anhydride gas, that is, the temperature of the mixed gas is reduced to below 202°C, so that the maleic anhydride in the mixed gas changes from gas to liquid, and then refluxes into the absorption box 31 through the exhaust pipe 36, so that the maleic anhydride in the mixed gas is fully absorbed to reduce waste; on the other hand, the heat carried in the mixed gas can be utilized through the heat exchange effect of the heat exchanger 20, and water is heated by heat exchange to reduce costs.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to 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 should not be understood as a limitation on the present invention.

[0035] The above is based on the ideal embodiment of the utility model. Through the above description, relevant staff can make various changes and modifications without departing from the scope of the utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A maleic anhydride synthesis absorption device, characterized in that: The invention comprises a fixed bed reactor, a heat exchanger and an absorption device, wherein the fixed bed reactor is connected to the absorption device, the absorption device is connected to the heat exchanger, the absorption device comprises an absorption box, a feeding pump is arranged on the side of the absorption box, a feeding pipe is arranged on the feeding pump, one end of the feeding pipe extends into the absorption box, a discharge pipe is connected to the bottom of the side of the absorption box, the discharge pipe is connected to the inside of the absorption box, a valve is installed on the discharge pipe, a material pump is also installed on the absorption box, a feed pipe and a discharge pipe are respectively connected to the material pump, the feed pipe and the The discharge pipes are respectively connected with the inside of the absorption box, the connection between the feed pipe and the absorption box is located at the bottom of the side of the absorption box, the end of the discharge pipe away from the material pump passes through the side wall of the absorption box and extends into the absorption box, the end of the discharge pipe located in the absorption box is fixedly connected with a distribution plate, the distribution plate is hollow, the discharge pipe is connected with the inside of the distribution plate, a plurality of nozzles are installed on the side of the distribution plate away from the discharge pipe, the top of the absorption box is connected with a vertically arranged exhaust pipe, and the absorption device is connected to the heat exchanger through the exhaust pipe.

2. A maleic anhydride synthetic absorption device according to claim 1, characterized in that: A discharge port is provided at the top of the heat exchanger, a feed port is provided at the bottom of the heat exchanger, two connecting pipes are provided on the side of the heat exchanger, the connecting pipes are connected with the inside of the heat exchanger, the two connecting pipes are arranged along the height direction on the heat exchanger, a regulating valve is provided on one of the two connecting pipes located close to the upper side of the heat exchanger, two tube sheets are provided inside the heat exchanger, and the two tube sheets are arranged in sequence from top to bottom inside the heat exchanger.

3. A maleic anhydride synthetic absorption device according to claim 2, characterized in that: The tube sheet is provided with a plurality of through holes, and the plurality of through holes on the two tube sheets correspond to each other one by one. A branch pipe is also provided inside the heat exchanger, and the top end of the branch pipe is provided in the through hole of the upper tube sheet, and the bottom end of the branch pipe is provided in the through hole of the lower tube sheet, and the branch pipe is provided vertically.

4. The maleic anhydride synthetic absorption device according to claim 1, characterized in that: The fixed bed reactor and the absorption device are connected together through a first material delivery pipe.

5. The maleic anhydride synthetic absorption device according to claim 2, characterized in that: The two connecting pipes are located on the heat exchanger between the two tube sheets.

6. The maleic anhydride synthetic absorption device according to claim 2, characterized in that: A temperature sensor is also installed inside the heat exchanger, and the temperature sensor is arranged on the inner wall of the heat exchanger.

7. The maleic anhydride synthetic absorption device according to claim 6, characterized in that: The temperature sensor is located between the two tube sheets.

8. The maleic anhydride synthetic absorption device according to claim 2, characterized in that: The tube sheets are arranged horizontally, and two tube sheets are fixedly arranged on the inner wall of the heat exchanger.

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