Reaction rectifying tower for catalytic reaction rectification

Abstract

The utility model provides a reactive distillation tower for catalytic reactive distillation, which comprises a tower body, an external downcomer component is arranged on the outer side of the tower body, the external downcomer component is communicated with the tower body, and the tower body is sequentially provided with a distillation section, a reaction section and a stripping section from top to bottom; a plurality of in-tower assemblies are arranged in the reaction section of the tower body; each in-tower assembly comprises a claw-type distributor, a reaction tower tray and an annular gas-phase distribution pipe, and the claw-type distributor is positioned above the reaction tower tray; and the annular gas phase distribution pipe is communicated with the claw type distributor. The reaction rectifying tower has the beneficial effects that a liquid phase at the reaction section of the reaction rectifying tower enters the reaction tower tray at the lower layer through the external downcomer, can bypass the reaction tower tray with inactivated catalyst, directly enters the reaction tower trays at the reaction sections at the lower layer and the lower layer, and can realize on-line loading and unloading of the catalyst; the stable operation time of the reactive distillation tower is obviously prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of catalytic reaction distillation, in particular to a reaction distillation tower used for catalytic reaction distillation. Background Art

[0002] Reactive distillation is a unit operation that integrates chemical reaction and separation operation in a reactive distillation tower. It is widely used in esterification, etherification and other situations that are limited by chemical equilibrium and require separation of esters or by-product water to make the reaction proceed in the forward direction. The reactive distillation tower integrates the reactor and the distillation tower, which not only improves energy utilization, but also reduces equipment costs.

[0003] However, for most catalytic reaction distillation, loading of catalyst in the reaction section is a major technical difficulty. Most of the reaction distillation towers currently in operation adopt a design scheme that mixes catalyst and filler, which makes the catalyst loading scheme complicated and the processing and manufacturing costs high. In addition, when the catalyst in the reaction distillation tower is deactivated, it can only be stopped for maintenance, and the corresponding catalyst and filler must be removed, making it difficult for the equipment to operate stably for a long time. Utility Model Content

[0004] In view of this, the utility model aims to provide a reaction distillation tower for catalytic reaction distillation to solve the problems of complex catalyst loading scheme and high processing and manufacturing cost.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] The utility model provides a reaction distillation tower for catalytic reaction distillation, comprising a tower body, an external downcomer assembly is arranged on the outside of the tower body, the external downcomer assembly is connected to the tower body, and the tower body is provided with a distillation section, a reaction section, and a stripping section in sequence from top to bottom;

[0007] Several tower components are arranged in the reaction section of the tower body;

[0008] The components in the tower include a claw-type distributor, a reaction tower plate, and an annular gas phase distribution pipe, wherein the claw-type distributor is located above the reaction tower plate (5);

[0009] The annular gas phase distribution pipe is communicated with the claw-type distributor.

[0010] Furthermore, the claw distributor includes a U-shaped tube and a gas lift cap, the end of the gas lift cap is connected to the middle of the U-shaped tube; the other end of the gas lift cap is connected to the reaction tower plate, and the reaction tower plate is fixedly arranged in the tower body;

[0011] The U-shaped tube of the claw distributor is connected to the annular gas phase distribution pipe.

[0012] Furthermore, a side of the annular gas phase distribution pipe away from the gas lifting cap is provided with a plurality of first gas outlet holes distributed along the circumference, and a side of the annular gas phase distribution pipe close to the gas lifting cap is provided with a plurality of second gas outlet holes distributed along the circumference;

[0013] Furthermore, the position of the first gas outlet corresponds to the position of the second gas outlet; that is, one first gas outlet corresponds to one second gas outlet; the first gas outlet and the second gas outlet are arranged on both sides of the lower side of the annular gas phase distribution pipe;

[0014] Furthermore, the number of the first air outlet holes is at least 15, and the number of the second air outlet holes is at least 15.

[0015] Furthermore, the angle formed by the line connecting the centroid of the first gas outlet and the centroid of the annular gas phase distribution pipe and the vertical direction is 30° to 60°; for example, 35°, 40°, 45°, 50° or 55°, preferably 40° to 50°;

[0016] Moreover, the angle formed by the line connecting the centroid of the second gas outlet and the centroid of the annular gas phase distribution pipe and the vertical direction is 30° to 60°, for example, 35°, 40°, 45°, 50° or 55°, preferably 40° to 50°.

[0017] Furthermore, a feed pipe is provided between the rectifying section and the reaction section of the tower body, a gas phase outlet pipe is provided on the top of the tower body, a liquid reflux pipe is provided above the rectifying section of the tower body, and the liquid reflux pipe is provided between the feed pipe and the gas phase outlet pipe;

[0018] Furthermore, a bottom pipe is provided at the bottom of the tower body;

[0019] In addition, a first pipeline and a second pipeline are sequentially arranged at the bottom of the distillation section of the tower body from bottom to top.

[0020] Furthermore, the external downcomer assembly includes an online catalyst feeding / discharging pipe, a reaction section jumper pipe, and a tower plate liquid phase inlet / discharge pipe. Several tower plate liquid phase inlet / discharge pipes are arranged on the tower body, and a reaction section jumper pipe is arranged between two tower plate liquid phase inlet / discharge pipes. The reaction section jumper pipes are all connected to the online catalyst feeding / discharging pipe.

[0021] Furthermore, one end of the liquid phase inlet / outlet pipe of the tower tray is arranged above the upper tower tray, and the other end of the liquid phase inlet / outlet pipe of the tower tray is arranged above the lower tower tray and close to the tower tray. Preferably, in the utility model, one end of the liquid phase inlet / outlet pipe of the tower tray is arranged in the clear liquid layer above the upper tower tray, which is the feed port, and the other end of the liquid phase inlet / outlet pipe of the tower tray is arranged above the lower tower tray and close to the tower tray, which is the discharge port.

[0022] The catalyst in the reaction distillation tower of the utility model is placed on the reaction section tray and can flow freely. The catalyst can be loaded and unloaded online through the catalyst online feeding / discharging pipe, the reaction section jumper pipe and the tray liquid phase feeding / discharging pipe, thereby significantly extending the stable operation time of the reaction distillation tower.

[0023] Furthermore, a catalyst layer is located above the reaction tray, and the annular gas phase distribution pipe is immersed in the catalyst layer.

[0024] The annular gas phase distribution ring tube of the utility model is relatively close to the reaction tower plate, and the annular gas phase distribution ring tube is immersed in the catalyst particles. The gas phase is collected in the bottom annular gas phase distribution tube after passing through each claw distributor, and then ejected from the gas outlet of the annular tube, and can carry the catalyst deposited on the bottom layer of the tower plate to flow together. At the same time, the gas content of the material near the annular gas phase distribution tube is high and the density is low, and the gas content of the material far away from the gas phase distribution tube is low and the density is low, and thus a siphon effect will be generated. By controlling the ring radius of the annular gas phase distribution tube, the reaction section tower plate will generate a circulation from the tower plate extension and the center to the annular gas phase distribution tube respectively, and the circulation flow will carry the catalyst to move together, so that the catalysts at each radial position on the entire tower plate can flow, and then the catalyst is evenly distributed in the liquid phase. Through the design of the annular gas phase distribution tube, a good gas-liquid-solid three-phase flow will be realized on the reaction section tower plate, the heat and mass transfer effect will be enhanced, and the catalytic reaction effect will be strengthened. The claw distributor and the annular gas phase distribution tube of the reaction section tower internals have no motion loss and a long service life.

[0025] Above the catalyst layer are a clear liquid layer and a foam layer in sequence; the position of the clear liquid layer corresponds to the middle of the components in the tower, and the position of the foam layer is 150 mm to 400 mm higher than the clear liquid layer, preferably 200 mm ± 5 mm.

[0026] The reaction distillation tower described in the utility model has a simple design of the internal parts of the reaction section, and the equipment manufacturing cost is significantly reduced. The catalyst of the reaction distillation tower designed by the utility model is placed on the reaction section tower plate and can flow freely, which is beneficial to the heat and mass transfer on the catalyst surface and strengthens the catalytic reaction. The size range of the equipment described in the utility model is DN200-4000, and the corresponding device production capacity varies from 100 tons / year to hundreds of thousands of tons / year, and can be widely used in devices of various production scales. The size of the equipment designed by the utility model can vary in a wide range, and the heat transfer, mass transfer, and kinetic data obtained on the pilot scale can be directly used for industrial device amplification.

[0027] Compared with the prior art, the reaction distillation tower for catalytic reaction distillation described in the utility model has the following advantages:

[0028] 1. The liquid phase of the reaction section of the reactive distillation tower designed by the utility model enters the reaction tray of the lower layer through the external downcomer, and can bypass the reaction tray of the catalyst deactivation and directly enter the reaction tray of the lower reaction section.

[0029] 2. The gas phase of the reaction section of the reaction distillation tower designed by the utility model enters the upper reaction tower plate from the lower reaction tower plate through the gas lifting cap in the center of the tower plate, passes through the gas lifting cap and U-shaped tube of the claw distributor, and is collected in the gas phase distribution pipe, and finally ejected from the gas outlet provided on the gas phase distribution pipe. This design can effectively control the entrained liquid flooding and overflow liquid flooding, and improve the operational flexibility of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0031] Figure 1 It is a schematic diagram of a reaction distillation tower for catalytic reaction distillation according to an embodiment of the utility model;

[0032] Figure 2 This is a schematic diagram of the internal components of a reaction distillation tower for catalytic reaction distillation according to an embodiment of the utility model;

[0033] Figure 3 It is a schematic diagram of a gas phase distribution pipe of a reaction distillation tower for catalytic reaction distillation according to an embodiment of the utility model;

[0034] Figure 4 A schematic diagram of a first gas outlet and a second gas outlet of a reaction distillation tower for catalytic reaction distillation according to an embodiment of the utility model;

[0035] Figure 5 It is a schematic top view of the components inside a reaction distillation tower for catalytic reaction distillation according to an embodiment of the utility model.

[0036] Description of reference numerals:

[0037] 1. Distillation section; 2. Reaction section; 3. Stripping section; 4. U-shaped tube; 5. Reaction tray; 6. Annular gas phase distribution pipe; 7. Lifting cap; 8. First gas outlet; 9. Second gas outlet; 10. Feed pipe; 11. Gas phase outlet pipe; 12. Liquid reflux pipe; 13. Bottom pipe; 14. Catalyst online feeding / discharging pipe; 15. Reaction section jumper pipe; 16. Tray liquid inlet / discharge pipe; 161. First branch pipe; 162. Second branch pipe; 163. Third branch pipe; 164. Fourth branch pipe; 165. Ninth branch pipe; 166. Fifth branch pipe; 167. Sixth branch pipe; 168. Seventh branch pipe; 169. Eighth branch pipe; 7. Catalyst layer; 18. Clear liquid layer; 19. Foam layer. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] Example 1

[0041] like Figures 1 to 5 As shown, the present embodiment provides a reaction distillation tower for catalytic reaction distillation, including a tower body, an external downcomer assembly is provided on the outer side of the tower body, the external downcomer assembly is connected to the tower body, and the tower body is provided with a distillation section 1, a reaction section 2, and a stripping section 3 from top to bottom; a plurality of in-tower components are provided in the reaction section 2 of the tower body; the in-tower components include a claw distributor, a reaction tower plate 5, and an annular gas phase distribution pipe 6, the claw distributor is located above the reaction tower plate 5; the annular gas phase distribution pipe 6 is connected to the claw distributor.

[0042] Example 2

[0043] like Figures 1 to 5 As shown, on the basis of Example 1, the claw distributor in this embodiment includes a U-shaped tube 4 and a gas lift cap 7, the end of the gas lift cap 7 is connected to the middle of the U-shaped tube 4; the other end of the gas lift cap 7 is connected to the reaction tower plate 5, and the reaction tower plate 5 is fixedly arranged in the tower body; the U-shaped tube 4 of the claw distributor is connected to the annular gas phase distribution tube 6; the length of the gas lift cap 7 is greater than the length of the U-shaped tube 4. A plurality of first gas outlet holes 8 distributed along the circumference are provided on the side of the annular gas phase distribution tube 6 away from the gas lift cap 7, and a plurality of second gas outlet holes 9 distributed along the circumference are provided on the side of the annular gas phase distribution tube 6 close to the gas lift cap 7; the position of the first gas outlet hole 8 corresponds to the position of the second gas outlet hole 9; the number of the first gas outlet holes 8 is 20, and the number of the second gas outlet holes 9 is 20. Furthermore, the angle formed by the line connecting the centroid of the first gas outlet 8 and the center of the annular gas phase distribution pipe 6 and the vertical direction is 45°; the angle formed by the centroid of the second gas outlet 9 and the center of the annular gas phase distribution pipe 6 and the vertical direction is 45°.

[0044] Example 3

[0045] like Figures 1 to 5 As shown, on the basis of Example 2, in this embodiment, a feed pipe 10 is provided between the distillation section 1 and the reaction section 2 of the tower body, a gas phase outlet pipe 11 is provided on the top of the tower body, a liquid reflux pipe 12 is provided above the distillation section 1 of the tower body, and the liquid reflux pipe 12 is arranged between the feed pipe 10 and the gas phase outlet pipe 11; a bottom pipe 13 is provided at the bottom of the tower body.

[0046] The external downcomer assembly includes an online catalyst feeding / discharging pipe 14, a reaction section jumper pipe 15, and a tower plate liquid phase inlet / discharge pipe 16. A plurality of tower plate liquid phase inlet / discharge pipes 16 are arranged on the tower body, a reaction section jumper pipe 15 is arranged between the tower plate liquid phase inlet / discharge pipes 16, and the reaction section jumper pipes 15 are all connected to the online catalyst feeding / discharging pipe 14; the discharge port of the tower plate liquid phase inlet / discharge pipe 16 is arranged in the clear liquid layer of the upper tower plate, and the feed port of the tower plate liquid phase inlet / discharge pipe 16 is arranged at a position close to the tower plate of the lower tower plate.

[0047] A catalyst layer 17 is provided above the reaction tray 5, and the annular gas phase distribution pipe 6 is immersed in the catalyst layer.

[0048] Above the catalyst layer are a clear liquid layer 18 and a foam layer 19 in sequence; the position of the clear liquid layer 18 corresponds to the middle of the components in the tower, and the position of the foam layer 19 is 200 mm±5 mm higher than the clear liquid layer.

[0049] Example 4

[0050] like Figures 1 to 5 As shown, on the basis of Example 3, the number of tower components in this embodiment is 3, which are the first tower component, the second tower component, and the third tower component from top to bottom. The tower plate liquid phase inlet / outlet pipe 16 is connected to the tower body through a branch pipe, and the branch pipe includes a first branch pipe 161, a second branch pipe 162, and a third branch pipe 163; wherein the positions at which the first branch pipe 161, the second branch pipe 162, and the third branch pipe 163 are connected to the tower body correspond to the middle parts of the three tower components along the height direction, respectively, the first branch pipe 161 is connected to the first tower component, the second branch pipe 162 is connected to the second tower component, and the third branch pipe 163 is connected to the third tower component.

[0051] The branch pipes further include a fourth branch pipe 164, a fifth branch pipe 166, a sixth branch pipe 167, a seventh branch pipe 168, an eighth branch pipe 169, and a ninth branch pipe 165;

[0052] The fourth branch pipe 164 is arranged at both sides of the bottom of the claw-type distributor in the first tower component, the fifth branch pipe 166 and the sixth branch pipe 167 are arranged at both sides of the bottom of the claw-type distributor in the second tower component, the seventh branch pipe 168 and the eighth branch pipe 169 are arranged at both sides of the bottom of the claw-type distributor in the third tower component. The ninth branch pipe 165 is arranged below the lowest tower component in the tower body.

[0053] The reaction section jumper pipe includes a first reaction section jumper pipe 151, a second reaction section jumper pipe 152, and a third reaction section jumper pipe. The first reaction section jumper pipe 151, the second reaction section jumper pipe 152, and the third reaction section jumper pipe (not shown) are all connected to the catalyst online feeding / discharging pipe 14;

[0054] The first branch pipe 161, the fourth branch pipe 164, and the fifth branch pipe 166 are all connected to the first reaction stage jumper pipe 151; the third branch pipe 163, the seventh branch pipe 168, and the ninth branch pipe 165 are all connected to the second reaction stage jumper pipe 152; the first reaction stage jumper pipe 151 and the second reaction stage jumper pipe 152 are all connected to the catalyst online feeding / discharging pipe 14; the second branch pipe 162, the sixth branch pipe 167, and the eighth branch pipe 169 are connected to the third reaction stage jumper pipe, and the third reaction stage jumper pipe is connected to the catalyst online feeding / discharging pipe 14.

[0055] In order to prevent the catalyst on the reaction tray 5 from leaking into the lower tray, the built-in new type of tower internals tray is not provided with sieve holes, and the gas phase needs to enter the upper tray from the lower tray through the gas riser structure. By setting this structure, the uniform distribution of the gas phase on the tray can be achieved, and it is beneficial to enhance the heat and mass transfer effect. The gas phase of the reaction section 2 of the reaction distillation tower designed by the utility model enters the upper reaction tray 5 from the lower reaction tray 5 through the gas riser cap 7 in the center of the tray. The gas riser cap 7 is provided with a number of U-shaped pipe branches, which are collected in the gas phase distribution pipe and finally ejected from the small holes provided on the gas phase distribution pipe. Through this design, entrained liquid flooding and overflow liquid flooding can be effectively controlled, and the operational flexibility of the equipment can be improved. The functions of online loading, replacement, and regeneration of the catalyst are realized, which greatly improves the stable operation of the device and saves the cost of purchasing the catalyst. The reaction section of the reaction distillation tower designed by the utility model has a simple structure and significantly reduces the processing and manufacturing costs. The equipment designed by the utility model is flexibly designed according to the changes in the production scale of the device and has a wide range of applications.

[0056] 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, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reaction distillation tower for catalytic reaction distillation, characterized in that: The tower body comprises a tower body, an external downcomer assembly is arranged on the outside of the tower body, the external downcomer assembly is connected to the tower body, and the tower body is provided with a rectification section (1), a reaction section (2), and a stripping section (3) in sequence from top to bottom; A plurality of tower components are arranged in the reaction section (2) of the tower body; The components in the tower include a claw-type distributor, a reaction tower plate (5), and an annular gas phase distribution pipe (6), wherein the claw-type distributor is located above the reaction tower plate (5); The annular gas phase distribution pipe (6) is communicated with the claw-type distributor.

2. A reaction distillation tower for catalytic reaction distillation according to claim 1, characterized in that: The claw-type distributor comprises a U-shaped tube (4) and a gas lift cap (7), wherein the end of the gas lift cap (7) is connected to the middle of the U-shaped tube (4); the other end of the gas lift cap (7) is connected to a reaction tower plate (5), and the reaction tower plate (5) is fixedly arranged in the tower body; The U-shaped tube (4) of the claw-type distributor is connected to the annular gas phase distribution tube (6).

3. A reaction distillation tower for catalytic reaction distillation according to claim 1, characterized in that: A plurality of first gas outlet holes (8) distributed along the circumference are provided on a side of the annular gas phase distribution pipe (6) away from the gas lift cap (7), and a plurality of second gas outlet holes (9) distributed along the circumference are provided on a side of the annular gas phase distribution pipe (6) close to the gas lift cap (7).

4. A reaction distillation tower for catalytic reaction distillation according to claim 1, characterized in that: The position of the first air outlet (8) corresponds to the position of the second air outlet (9); And / or, the number of the first air outlet holes (8) is at least 15, and the number of the second air outlet holes (9) is at least 15.

5. A reaction distillation tower for catalytic reaction distillation according to claim 1, characterized in that: The angle formed by the connecting line of the centroid of the first gas outlet (8) and the centroid of the annular gas phase distribution pipe (6) and the vertical direction is 30° to 60°.

6. A reaction distillation tower for catalytic reaction distillation according to claim 5, characterized in that: The angle formed by the connecting line of the centroid of the first gas outlet (8) and the centroid of the annular gas phase distribution pipe (6) and the vertical direction is 40° to 50°.

7. A reaction distillation tower for catalytic reaction distillation according to claim 1, characterized in that: The angle formed by the line connecting the centroid of the second gas outlet (9) and the centroid of the annular gas phase distribution pipe (6) and the vertical direction is 30° to 60°.

8. A reaction distillation tower for catalytic reaction distillation according to claim 7, characterized in that: The angle formed by the line connecting the centroid of the second gas outlet (9) and the centroid of the annular gas phase distribution pipe (6) and the vertical direction is 40° to 50°.

9. A reaction distillation tower for catalytic reaction distillation according to claim 1, characterized in that: A feed pipe (10) is provided between the rectifying section (1) and the reaction section (2) of the tower body, a gas phase outlet pipe (11) is provided at the top of the tower body, a liquid reflux pipe (12) is provided above the rectifying section (1) of the tower body, and the liquid reflux pipe (12) is arranged between the feed pipe (10) and the gas phase outlet pipe (11).

10. A reaction distillation tower for catalytic reaction distillation according to claim 1, characterized in that: A bottom pipeline (13) is provided at the bottom of the tower body.

11. A reaction distillation tower for catalytic reaction distillation according to claim 1, characterized in that: The external downcomer assembly comprises a catalyst online feeding / discharging pipe (14), a reaction section jumper pipe (15), and a tower plate liquid phase inlet / discharge pipe (16); a plurality of tower plate liquid phase inlet / discharge pipes (16) are arranged on the tower body; a reaction section jumper pipe (15) is arranged between two tower plate liquid phase inlet / discharge pipes (16); and the reaction section jumper pipes (15) are all connected to the catalyst online feeding / discharging pipe (14); Furthermore, one end of the tray liquid phase inlet / outlet pipe (16) is arranged above the upper tray, and the other end of the tray liquid phase inlet / outlet pipe (16) is arranged above the lower tray and close to the tray.

12. A reaction distillation tower for catalytic reaction distillation according to claim 1, characterized in that: Above the reaction tray (5) is a catalyst layer (17), and the annular gas phase distribution pipe (6) is immersed in the catalyst layer; Above the catalyst layer are a clear liquid layer (18) and a foam layer (19) in sequence; the position of the clear liquid layer (18) corresponds to the middle of the components in the tower, and the position of the foam layer (19) is 150 mm to 400 mm higher than the clear liquid layer.

13. A reaction distillation tower for catalytic reaction distillation according to claim 12, characterized in that: The position of the foam layer (19) is 200 mm ± 5 mm above the clear liquid layer.

Images