Xylene transformation system
By eliminating the extraction of C8-component in the xylene tower and using a top reflux pump for direct extraction and a guide belt structure, the problem of excessive C8-component was solved, the xylene yield was improved, and the operation difficulty and energy consumption were reduced.
Patent Information
- Application Number
- CN202520040651.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-01-08
AI Technical Summary
The existing xylene production process has excessive C8 component content, resulting in low xylene yield and increased operational difficulty and labor intensity.
By eliminating the extraction of C8- components in the xylene column and instead extracting them directly from the top of the column using a reflux pump, and by installing spiral guide belts and arc belts inside the column to promote gas mixing and condensation, combined with process optimization, secondary distillation is achieved.
It improves the purity of xylene distillation and recovery, and reduces the number of equipment operations and heat loss.
Smart Images
Figure CN223654470U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of xylene refining, specifically to a xylene transformation system. BACKGROUND
[0002] Xylene has wide application in industry, which can be used as solvent in paint, resin, dye, ink and other industries, and can be used as synthetic monomer or solvent in medicine and pesticide industries, in addition, it can be used as high octane gasoline component and is an important raw material of organic chemical industry.
[0003] The existing xylene production process generally includes rectification method, catalytic reforming method, methylation method and disproportionation method, and xylene column is used for refining in industrial production, but in the refining operation, the content of xylene in C8 component exceeds the standard, which causes low xylene yield and increases the operation difficulty and labor intensity of operators. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a xylene transformation system to solve the problems in the above background technology.
[0005] To achieve the above object, the utility model provides the following technical scheme: a xylene transformation system, comprising a xylene column, a lower feeding valve and an upper feeding valve are formed in the side wall of the xylene column, a suction pump is fixedly connected to the top side wall of the xylene column through a gas outlet pipe, the output end of the suction pump is fixedly connected with a reflux tank through a pipeline, a condensing cylinder is arranged outside the connecting pipeline between the reflux tank and the suction pump, a circulating heat exchange device is fixedly connected to the side of the condensing cylinder through a circulating pipeline, an output pump is fixedly connected to the side wall of the reflux tank through a connecting pipe, a transfer pipe is fixedly connected to the output end of the output pump, a reflux pump is fixedly connected to the bottom end of the reflux tank, a reflux pipe is fixedly connected to the output end of the reflux pump, one end of a self-flowing pipe is fixedly connected to the inner wall of the bottom end of the xylene column, a kettle liquid tank is fixedly connected to the other end of the self-flowing pipe, a heavy liquid pipe is fixedly connected to the end of the kettle liquid tank away from the self-flowing pipe, a reboiler is fixedly connected to the top end of the kettle liquid tank through a pipeline, and a rectification pipe is fixedly connected to the output end of the reboiler.
[0006] Preferably, a vertical frame is arranged on the side of the xylene column, and a flat plate is arranged in the vertical frame, and the suction pump, the reflux tank, the condensing cylinder, the circulating heat exchange device, the output pump, the reflux pump, the kettle liquid tank and the reboiler are fixedly installed on the upper surface of the flat plate arranged in the vertical frame, so as to provide stable support and safe working environment for the above-mentioned equipment.
[0007] Preferably, the lower feed valve is connected with the output end of the external pre-fractionating tank to input the XS produced in the pre-fractionating tank into the internal cavity of the xylene column, and the xylene gas is moved upward by the rectification of the xylene column, and the upper feed valve is connected with the output end of the external nitrogen supply device to realize the intermittent air supply into the cavity of the xylene column.
[0008] Preferably, the top end of the self-flow pipe is arranged at the center of the bottom of the xylene column, and the top end of the self-flow pipe is provided with a solenoid valve, and the outer side of the heavy liquid pipe is provided with a water cooling device, so that the C8+ components flowing into the tank through the self-flow pipe can be discharged and collected after being cooled to about 40 DEG C.
[0009] Preferably, the arc-shaped inner surface of the xylene column is fixedly installed with a guide belt, the lower surface of the guide belt is fixedly installed with an arc-shaped belt, and the arc-shaped belt is fixedly installed with a protrusion on one side of the outer wall close to the center of the xylene column.
[0010] Preferably, a plurality of groups of the guide belts are arranged on the inner surface of the xylene column in a spiral line array, and the guide belts are arranged in a spiral shape to form a spiral upward guide structure on the inner surface of the xylene column.
[0011] Preferably, the curved portion of the arc-shaped belt protrudes towards the center of the xylene column, so that the gas has a downward dispersion effect when blowing to the surface of the arc-shaped belt, a plurality of groups of the protrusions are uniformly distributed on the surface of the arc-shaped belt, and the protrusions are arranged in a water drop shape to facilitate the xylene gas near the surface of the arc-shaped belt to be more easily condensed into water drops and fall down.
[0012] Compared with the prior art, the xylene reforming system has the following beneficial effects:
[0013] 1. The xylene reforming system cancels the extraction of C8- components in the xylene column, changes the extraction of xylene from the side line to the direct extraction from the top of the column by using the reflux pump, cancels the reflux operation, and intermittently extracts the C8+ components from the tank according to the liquid level change and the test results, reduces the equipment operation times through process optimization and reforming, and reduces the heat loss.
[0014] 2. In this xylene modification system, during the upward process of the distilled mixed gas, the gas entering through the upper and lower feed valves can spiral upward along the inner surface of the xylene tower. With the setting of the arc-shaped belt, the gas has a downward dispersion effect when it is blown onto the surface of the arc-shaped belt. In addition, the spirally set guide belt promotes the mixing effect of the gas in the xylene tower. Furthermore, through several water droplet-shaped protrusions on the surface of the arc-shaped belt, the xylene gas near the surface of the arc-shaped belt is more likely to condense into water droplets and fall, realizing the internal secondary distillation in advance and improving the purity of xylene during distillation and harvesting. Attached Figure Description
[0015] Fig. 1 This is a schematic diagram of the main structure of the present utility model;
[0016] Fig. 2 This is a cross-sectional structural diagram of the present invention;
[0017] Fig. 3 This is a schematic diagram of the guide belt structure of this utility model.
[0018] In the diagram: 1. Xylene tower; 2. Lower feed valve; 3. Upper feed valve; 4. Gas outlet pipe; 5. Suction pump; 6. Reflux tank; 7. Condenser; 8. Circulating heat exchanger; 9. Output pump; 10. Transfer pipe; 11. Reflux pump; 12. Reflux pipe; 13. Gravity pipe; 14. Kettle tank; 15. Heavy liquid pipe; 16. Reboiler; 17. Distillation tube; 18. Guide belt; 19. Arc belt; 20. Protrusion. Detailed Implementation
[0019] like Figs. 1-3 As shown, this utility model provides a technical solution: a xylene modification system, including a xylene tower 1. A lower feed valve 2 and an upper feed valve 3 are provided on the side wall of the xylene tower 1. A suction pump 5 is fixedly connected to the top side wall of the xylene tower 1 via an outlet pipe 4. The output end of the suction pump 5 is fixedly connected to a reflux tank 6 via a pipe. A condenser 7 is sleeved on the outside of the pipe connecting the reflux tank 6 and the suction pump 5. A circulating heat exchange device 8 is fixedly connected to the side of the condenser 7 via a circulating pipe. The side wall of the reflux tank 6 is fixedly connected to... There is an output pump 9, and the output end of the output pump 9 is fixedly connected to a transfer pipe 10. The bottom end of the reflux tank 6 is fixedly connected to a reflux pump 11, and the output end of the reflux pump 11 is fixedly connected to a reflux pipe 12. One end of a gravity flow pipe 13 is fixedly connected to the inner wall of the bottom end of the xylene tower 1, and the other end of the gravity flow pipe 13 is fixedly connected to a bottom liquid tank 14. The end of the bottom liquid tank 14 away from the gravity flow pipe 13 is fixedly connected to a heavy liquid pipe 15. The top of the bottom liquid tank 14 is fixedly connected to a reboiler 16 through a pipe, and the output end of the reboiler 16 is fixedly connected to a distillation tube 17.
[0020] In an embodiment of the utility model, the side of xylene tower 1 is provided with vertical frame, and the inside of vertical frame is provided with plane board, and suction pump 5, reflux tank 6, condensing cylinder 7, circulating heat exchange device 8, output pump 9, reflux pump 11 and cauldron liquid tank 14 and reboiler 16 are all fixedly installed on the upper surface of the plane board provided in vertical frame, thereby providing stable support and safe working environment for the above-mentioned equipment, simultaneously, the top of xylene tower 1 is provided with hemispherical shape, and the inner wall of the top of xylene tower 1 is provided with arc shape, to promote the mixing effect of the gas generated due to rectification in xylene tower 1 to a certain extent in the top space of xylene tower 1, in addition, lower feed valve 2 is connected with the output end of external pre-fractionating tower cauldron in a through way, to input the XS generated in pre-fractionating tower cauldron into the internal cavity of xylene tower 1, and promote the upward movement of xylene gas through the rectification of xylene tower 1, specifically, upper feed valve 3 is connected with the output end of external nitrogen gas supply equipment in a through way, to realize the intermittent air supplement in the cavity of xylene tower 1, to ensure that the air pressure in xylene tower 1 is in a relatively stable state.
[0021] In addition, circulating heat exchange device 8 and condensing cylinder 7 adopt the mode of heat conduction oil circulation heat conduction to realize stable and balanced cooling, thereby extracting the mixed gas of xylene gas and nitrogen gas in xylene tower 1 extracted by suction pump 5, and liquefying the xylene entering the center of condensing cylinder 7 by condensing mode, and entering the inside of reflux tank 6 under the action of gravity along the pipeline, further, circulating heat exchange device 8 is arranged on one side of condensing cylinder 7, to avoid that the temperature of circulating heat exchange device 8 influences the condensing effect in the inside of condensing cylinder 7, simultaneously, reflux pump 11 is arranged directly below reflux tank 6, and the connecting place of output pump 9 and reflux tank 6 is arranged on the bottom of the side of reflux tank 6, to enable the xylene condensate falling into reflux tank 6 to be extracted by reflux pump 11 and output pump 9 respectively, thereby realizing the reflux and output collection of xylene condensate, specifically, one end of transfer pipe 10 away from output pump 9 is connected with the feed inlet of xylene storage tank in a through way, to enable a part of xylene condensate in reflux tank 6 to re-enter xylene tower 1 to realize rectification through reflux pipe 12, and the other part to enter xylene storage tank in storage area through transfer pipe 10, thereby realizing the recovery of xylene, simultaneously, the connecting place between reflux pipe 12 and xylene tower 1 is arranged between upper feed valve 3 and lower feed valve 2.
[0022] In the embodiment of the utility model, the top end of the self-flow pipe 13 is arranged at the bottom center of the xylene tower 1, and the top end of the self-flow pipe 13 is provided with a solenoid valve, and the outer side of the heavy liquid pipe 15 is provided with a water cooling device, so that the C8+ component flowing into the kettle liquid tank 14 through the self-flow pipe 13 can be discharged and collected after being cooled to about 40 DEG C, specifically, one end of the heavy liquid pipe 15 away from the kettle liquid tank 14 is connected with the heavy liquid storage tank of the storage tank area in a through manner, so that the staff can adjust the opening and closing of the self-flow pipe 13 according to the liquid level change in the xylene tower 1, and finally realize the intermittent production of C8+ component. Through process optimization and transformation, the equipment running times are reduced, and the heat loss is reduced.
[0023] Please refer to the attached drawings of the specification Figs. 2-3 In the embodiment of the utility model, the arc-shaped inner surface of the xylene tower 1 is fixedly installed with a guide belt 18, the lower surface of the guide belt 18 is fixedly installed with an arc-shaped belt 19, and the arc-shaped belt 19 is fixedly installed with a protruding block 20 on the outer wall of the side close to the center of the xylene tower 1.
[0024] Specifically, the guide belt 18 is provided with multiple groups, and the multiple groups of guide belts 18 are arranged at equal distances on the inner surface of the xylene tower 1 in a spiral line array, and the guide belt 18 is arranged in a spiral shape, so as to form a spiral upward guide structure on the inner surface of the xylene tower 1. When the xylene tower 1 is used, the mixed gas of rectification can be spirally raised along the inner surface of the xylene tower 1 in the rising process of the gas entering the upper feeding valve 3 and the lower feeding valve 2, further, the curved part of the arc-shaped belt 19 protrudes towards the center of the xylene tower 1, so that the gas has a downward dispersion effect when blowing to the surface of the arc-shaped belt 19, and then the guide belt 18 is arranged in a spiral shape to promote the mixing effect of the gas in the xylene tower 1, meanwhile, the multiple groups of protruding blocks 20 are uniformly distributed on the surface of the arc-shaped belt 19, and the protruding blocks 20 are arranged in a water drop shape to make the xylene gas near the surface of the arc-shaped belt 19 more easily condense into water drops and fall, realize the early secondary rectification in the interior, and improve the purity of xylene in the rectification recovery.
[0025] In the utility model, when using, the XS outputted in the prefractionating tower kettle is input into the internal cavity of the xylene tower 1, and is rectified through the xylene tower 1 to make xylene gas move upwards, specifically, the upper feeding valve 3 is connected with the output end of the external nitrogen gas supply equipment in penetration, thereby realizing intermittent air supplement into the cavity in the xylene tower 1, the mixed gas in the top inner wall space of the xylene tower 1 is extracted by the suction pump 5 and is output into the reflux tank 6, at this time, the xylene gas is liquefied through the condensing effect of the condensing cylinder 7 and enters the inside of the reflux tank 6 under the action of gravity along the pipeline, a part of xylene condensate can re-enter into the xylene tower 1 through the reflux pipe 12 to realize rectification, another part of xylene condensate can enter into the xylene storage tank in the storage area through the transfer pipe 10, thereby realizing xylene recovery, cancelling the recovery of C8-component, changing the xylene recovery from side line recovery to direct recovery from the top of the tower by using the reflux pump 11, cancelling the reflux operation, the tower kettle intermittently recovers C8+ component according to the liquid level change and the test result, through process optimization and transformation, the equipment operation times are reduced, and the heat loss is reduced.
[0026] The above has made detailed description to the utility model in general, but on the basis of the utility model, some modifications or improvements can be made to it, which is obvious to the general technical personnel in the technical field. Therefore, the modifications or improvements without departing from the spirit of the utility model idea are within the protection scope of the utility model.
Claims
1. A xylene reforming system comprising a xylene column (1), characterized in that: The lower feeding valve (2) and the upper feeding valve (3) are arranged on the side wall of the xylene tower (1), the top of the xylene tower (1) is fixedly connected with the suction pump (5) through the gas outlet pipe (4), the output end of the suction pump (5) is fixedly connected with the reflux tank (6) through the pipeline, the pipeline connecting the suction pump (5) and the reflux tank (6) is sleeved with the condensing cylinder (7) outside, the side of the condensing cylinder (7) is fixedly connected with the circulating heat exchange device (8) through the circulating pipeline, the side wall of the reflux tank (6) is fixedly connected with the output pump (9) through the connecting pipe, the output end of the output pump (9) is fixedly connected with the transfer pipe (10), the bottom end of the reflux tank (6) is fixedly connected with the reflux pump (11), the output end of the reflux pump (11) is fixedly connected with the reflux pipe (12), one end of the self-flowing pipe (13) is fixedly connected to the inner wall of the bottom end of the xylene tower (1), the other end of the self-flowing pipe (13) is fixedly connected with the kettle liquid tank (14), the end away from the self-flowing pipe (13) of the kettle liquid tank (14) is fixedly connected with the heavy liquid pipe (15), the top end of the kettle liquid tank (14) is fixedly connected with the reboiler (16) through the pipeline, and the output end of the reboiler (16) is fixedly connected with the rectification pipe (17).
2. A xylene reformation system according to claim 1, characterized in that: The side of the xylene tower (1) is provided with a vertical frame, and the inside of the vertical frame is provided with a flat plate, and the suction pump (5), the reflux tank (6), the condensing cylinder (7), the circulating heat exchange device (8), the output pump (9), the reflux pump (11), and the kettle liquid tank (14) and the reboiler (16) are all fixedly installed on the upper surface of the flat plate arranged in the vertical frame.
3. A xylene reformation system according to claim 1, characterized in that: The lower feeding valve (2) is in through connection with the output end of the external pre-fractionating kettle, and the upper feeding valve (3) is in through connection with the output end of the external nitrogen gas supply device.
4. A xylene reformation system according to claim 1, characterized in that: The top end of the self-flowing pipe (13) is arranged at the bottom center of the xylene tower (1), the top end of the self-flowing pipe (13) is provided with an electromagnetic valve, and the outer side of the heavy liquid pipe (15) is provided with a water cooling device.
5. A xylene reformation system according to claim 1, characterized in that: The arc-shaped inner surface of the xylene tower (1) is fixedly installed with a guide belt (18), the lower surface of the guide belt (18) is fixedly installed with an arc-shaped belt (19), and the arc-shaped belt (19) is fixedly installed with a protruding block (20) on one side of the outer wall close to the center of the xylene tower (1).
6. A xylene reformation system according to claim 5, characterized in that: A plurality of groups of the guide belt (18) are arranged on the inner surface of the xylene tower (1) in a spiral line array at equal distances, and the guide belt (18) is arranged in a spiral shape.
7. A xylene reformation system according to claim 5, characterized in that: The curved part of the arc-shaped belt (19) protrudes towards the center of the xylene tower (1), a plurality of groups of the protruding block (20) are uniformly distributed on the surface of the arc-shaped belt (19), and the protruding block (20) is arranged in a water drop shape.