Heat removal distribution structure for isononyl alcohol hydroformylation reactor

Abstract

The invention provides a heat extraction distribution structure for an isononyl alcohol hydroformylation reactor, and relates to the technical field of isononyl alcohol hydroformylation reactors, the heat extraction distribution structure comprises an inner tube box and an outer tube box, the inner tube box is arranged in the outer tube box, a heat extraction medium inlet cavity is formed in the inner tube box, and a heat extraction medium outlet cavity is formed between the inner tube box and the outer tube box; the heat exchange pipes are U-shaped pipes, a heat removal medium inlet and a heat removal medium outlet are formed in the two ends of each heat exchange pipe correspondingly, and the heat removal medium inlets and the heat removal medium outlets communicate with the heat removal medium inlet cavity and the heat removal medium outlet cavity correspondingly; the distribution plate is provided with a plurality of positioning through holes and a distribution structure, and each heat exchange tube penetrates through two positioning through holes; the problems that in the prior art, a gas-liquid up-flow type bubbling bed reactor is not internally provided with internal components, gas distribution and heat extraction cannot be achieved, and the conversion rate of reaction is low are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of isononanol hydroformylation reactors, and more specifically, relates to a heat extraction distribution structure for isononanol hydroformylation reactors. Background Art

[0002] In recent years, with the rapid development of the plastics industry and the further improvement of people's environmental protection requirements, the new generation of plasticizer diisononyl phthalate (DINP) has been widely used in toys and wires and cables. As a raw material for the production of DINP, the demand for isononyl alcohol (INA) has also grown rapidly. Isononyl alcohol is generally produced by hydroformylation, that is, it is produced by the hydroformylation reaction of C8 olefins and synthesis gas under high temperature, high pressure and catalyst. At present, the industrialized hydroformylation technology is homogeneous catalytic hydroformylation technology.

[0003] The hydroformylation reaction is a highly exothermic reaction, and because the reaction temperature is strictly controlled, the reaction heat needs to be removed in time. Therefore, it is crucial to design a heat extraction reaction system that can both extract heat and ensure that the reaction temperature is as uniform as possible in space. The existing gas-liquid upflow bubbling bed reactor has no internal components, and cannot distribute gas and extract heat, resulting in a low reaction conversion rate. Summary of the invention

[0004] The purpose of the present invention is to provide a heat extraction distribution structure for an isononanol hydroformylation reactor in view of the deficiencies in the prior art, so as to solve the problem that the gas-liquid upflow bubbling bed reactor in the prior art has no internal components, cannot distribute gas and extract heat, and causes a low reaction conversion rate.

[0005] In order to achieve the above object, the present invention provides a heat extraction distribution structure for an isononanol hydroformylation reactor, comprising:

[0006] An inner tube box and an outer tube box, wherein the inner tube box is arranged inside the outer tube box, a heat medium inlet cavity is formed inside the inner tube box, and a heat medium outlet cavity is formed between the inner tube box and the outer tube box;

[0007] A plurality of heat exchange tubes, wherein the heat exchange tubes are U-shaped tubes, and the two ends of the heat exchange tubes are respectively a heat medium inlet and a heat medium outlet, and the heat medium inlet and the heat medium outlet are respectively connected to the heat medium inlet chamber and the heat medium outlet chamber;

[0008] At least one distribution plate is provided with a plurality of positioning through holes and a distribution structure, and each of the heat exchange tubes passes through two of the positioning through holes.

[0009] Optionally, a bottom plate and a cover plate are respectively provided at both ends of the inner tube box and the outer tube box, the heat medium inlet and the heat medium outlet are connected to the bottom plate, and a heat medium main inlet and a heat medium main outlet which are respectively connected to the heat medium inlet cavity and the heat medium outlet cavity are provided on the cover plate.

[0010] Optionally, the top projection of the axis of each heat exchange tube is a straight line, and the top projections of all the heat exchange tubes are divided into a plurality of regions of the same shape, and the plurality of regions have and only have one endpoint located at the center of a virtual circle, and the virtual circle is concentric with the cross section of the isononanol hydroformylation reactor, and the top projection of the heat exchange tube in each region can overlap with the top projection of the heat exchange tube in the adjacent region when rotating around the center of the circle by a set angle. Optionally, the region is a sector-shaped region, and the center angle of each sector-shaped region is 6°-60°.

[0011] Optionally, the heat exchange medium flowing in the heat exchange tube is deoxygenated water.

[0012] Optionally, at least two distribution plates are provided, and at least two distribution plates are arranged vertically at intervals, and the spacing between adjacent distribution plates is 1000-5000 mm.

[0013] Optionally, the aperture of the positioning through hole matches the outer diameter of the heat exchange tube.

[0014] Optionally, the distribution structure comprises a plurality of circular first distribution through holes, and the plurality of first distribution through holes are opened on the distribution plate.

[0015] Optionally, the distribution structure comprises a plurality of second distribution through holes in a long waist shape, and the plurality of second distribution through holes are opened on the distribution plate.

[0016] Optionally, the distribution plate is a wedge-shaped bar welded screen plate, and the strip seams of the wedge-shaped bar welded screen plate form the distribution structure.

[0017] The invention provides a heat extraction distribution structure for an isononanol hydroformylation reactor, and the beneficial effect is that the heat extraction distribution structure for the isononanol hydroformylation reactor comprises an inner tube box and an outer tube box, a heat extraction medium can enter through a heat extraction medium inlet cavity in the inner tube box and flow out through a heat extraction medium outflow cavity between the outer tube box and the inner tube box, so that the heat extraction medium can enter and exit from the inner tube box, the heat extraction medium inlets of a plurality of heat exchange tubes are all connected to the heat extraction medium inlet cavity, and the heat extraction medium outlets are all connected to the heat extraction medium outflow cavity, so that when the heat extraction medium flows in the heat exchange tube, the heat extraction medium with a lower temperature that has just entered can first extract heat from the inner center of the reactor, and the heat extraction amount is large, while the heat extraction medium with a higher temperature that has completed partial heat exchange can then extract heat from the inner outer ring of the reactor, and the heat extraction amount is small; Moreover, at least one distribution plate is provided with a plurality of positioning through holes and distribution structures, the positioning through holes can position the heat exchange tubes, form support for the heat exchange tubes, ensure the support strength of the heat exchange tubes, and the distribution structure can distribute the gas-liquid reaction medium, realize the stable and uniform distribution of gas and liquid in the reactor, improve the reaction conversion rate, and reduce the occurrence of back-mixing phenomenon; the gas-liquid reaction residence time of the isononanol hydroformylation reactor is relatively long, and the setting of the distribution plate reduces the back-mixing phenomenon, and the reactor radially presents the characteristics of middle heat and outer cold, so through the radial arrangement of the U-shaped heat exchange tubes of the heat extraction distribution structure for the isononanol hydroformylation reactor, the uneven temperature distribution in the radial direction of the reactor can be reduced as much as possible, which is conducive to the reaction and can improve the conversion rate. In addition, the present invention can also be applied to other gas-liquid upflow exothermic reactors for simultaneous heat extraction and gas distribution.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0020] Figure 1 A schematic diagram of a heat extraction distribution structure for an isononanol hydroformylation reactor according to an embodiment of the present invention is shown.

[0021] Figure 2 A schematic top view projection diagram of a heat exchange tube in a sector-shaped area of ​​a heat extraction distribution structure for an isononanol hydroformylation reactor according to an embodiment of the present invention is shown.

[0022] Figure 3 A schematic top projection diagram of a heat exchange tube in a sector-shaped area of ​​a heat extraction distribution structure for an isononanol hydroformylation reactor according to another embodiment of the present invention is shown.

[0023] Figure 4 A schematic structural diagram of a distribution plate of a heat extraction distribution structure for an isononanol hydroformylation reactor according to an embodiment of the present invention is shown.

[0024] Figure 5 A schematic structural diagram of a distribution plate of a heat extraction distribution structure for an isononanol hydroformylation reactor according to other embodiments of the present invention is shown.

[0025] Figure 6 A schematic structural diagram of a distribution plate of a heat extraction distribution structure for an isononanol hydroformylation reactor according to other embodiments of the present invention is shown.

[0026] Figure 7 A schematic diagram of positioning through holes on a distribution plate of a heat extraction distribution structure for an isononanol hydroformylation reactor according to an embodiment of the present invention is shown.

[0027] Description of reference numerals:

[0028] 501, inner tube box; 502, outer tube box; 503, heat exchange tube; 504, heat medium inlet; 505, heat medium outlet; 506, distribution plate; 507, positioning through hole; 508, bottom plate; 509, cover plate; 510, heat medium total inlet; 511, heat medium total outlet; 512, fan-shaped area; 513, first distribution through hole; 514, second distribution through hole; 515, wedge-shaped bar welded screen plate. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0030] like Figure 1 As shown, the present invention provides a heat extraction distribution structure for an isononanol hydroformylation reactor, comprising:

[0031] An inner tube box 501 and an outer tube box 502, wherein the inner tube box 501 is arranged inside the outer tube box 502, a heat medium inlet cavity is formed inside the inner tube box 501, and a heat medium outlet cavity is formed between the inner tube box 501 and the outer tube box 502;

[0032] A plurality of heat exchange tubes 503, wherein the heat exchange tubes 503 are U-shaped tubes, and the two ends of the heat exchange tubes 503 are respectively a heat medium inlet 504 and a heat medium outlet 505, and the heat medium inlet 504 and the heat medium outlet 505 are respectively connected to the heat medium inlet cavity and the heat medium outlet cavity;

[0033] At least one distribution plate 506 is provided with a plurality of positioning through holes 507 and a distribution structure, and each heat exchange tube 503 passes through two positioning through holes 507 .

[0034] Specifically, in order to solve the problem in the prior art that there are no internal components in the gas-liquid upflow bubbling bed reactor, gas cannot be distributed and heat cannot be taken out, resulting in a low reaction conversion rate; the heat extraction distribution structure for the isononanol hydroformylation reactor provided by the present invention comprises an inner tube box 501 and an outer tube box 502, and the heat medium can enter through the heat medium inlet cavity in the inner tube box 501 and flow out through the heat medium outflow cavity between the outer tube box 502 and the inner tube box 501, so that the heat medium can enter and exit from the inside and outside, and the heat medium inlets 504 of the plurality of heat exchange tubes 503 are all connected to the heat medium inlet cavity, and the heat medium outlets 505 thereof are all connected to the heat medium outflow cavity, so that when the heat medium flows in the heat exchange tubes 503, the heat medium with a lower temperature that has just entered can first take heat from the inner center of the reactor and take a larger amount of heat, while the heat medium with a higher temperature that has completed partial heat exchange can then flow out from the reactor The inner outer ring takes heat, and the amount of heat taken is small; and, since at least one distribution plate 506 is provided with a plurality of positioning through holes 507 and a distribution structure, the positioning through holes 507 can position the heat exchange tube 503, form a support for the heat exchange tube 503, and ensure the support strength of the heat exchange tube 503, and the distribution structure can distribute the gas-liquid reaction medium, so as to achieve a stable and uniform distribution of gas and liquid in the reactor, improve the reaction conversion rate, and reduce the occurrence of back mixing; the gas-liquid reaction residence time of the isononanol hydroformylation reactor is relatively long, and the setting of the distribution plate 506 reduces the back mixing phenomenon. In the radial direction, the reactor presents the characteristics of being hot in the middle and cold on the periphery. Therefore, through the radial arrangement of the U-shaped heat exchange tube 503 of the heat extraction distribution structure for the isononanol hydroformylation reactor, the uneven temperature distribution in the radial direction of the reactor can be minimized as much as possible, which is conducive to the reaction and can improve the conversion rate.

[0035] Furthermore, the U-shaped heat exchange tube 503 in the present invention is simple to manufacture and low in cost, and the multiple heat exchange tubes 503 can include a number of spare heat exchange tubes 503, both ends of the spare heat exchange tube 503 are blocked by pipe plugs. When some of the heat exchange tubes 503 are damaged, the inner tube box 501 and the outer tube box 502 can be opened to block both ends of the damaged heat exchange tube 503, and then the pipe plugs of the same number of spare heat exchange tubes 503 can be opened, thereby realizing very convenient maintenance.

[0036] Optionally, a bottom plate 508 and a cover plate 509 are respectively provided at both ends of the inner pipe box 501 and the outer pipe box 502, a heat medium inlet 504 and a heat medium outlet 505 are connected to the bottom plate 508, and a heat medium total inlet 510 and a heat medium total outlet 511 which are respectively connected to the heat medium inlet cavity and the heat medium outlet cavity are provided on the cover plate 509.

[0037] In this embodiment, the inner tube box 501 and the outer tube box 502 include an inner cylinder and an outer cylinder respectively, and the outer cylinder is coaxially sleeved on the outer side of the inner cylinder.

[0038] Specifically, the outer periphery of the outer tube box 502 can be connected to the inner wall of the reactor, or part of the inner wall of the reactor can be directly used as the outer cylinder of the outer tube box 502. The bottom plate 508 and the cover plate 509 block the heat medium inlet cavity and the heat medium outlet cavity, and a plurality of connecting holes are provided on the bottom plate 508, half of the plurality of connecting holes are connected to the heat medium inlet cavity, and the other half are connected to the heat medium outlet cavity; the heat medium first enters the heat medium inlet cavity through the heat medium main inlet 510, and then is distributed into the plurality of heat exchange tubes 503, and then flows into the heat medium outlet cavity, and uniformly flows out through the heat medium main outlet 511.

[0039] Optionally, the top projection of the axis of each heat exchange tube 503 is a straight line, and the top projections of all the heat exchange tubes 503 are divided into multiple regions of the same shape, and the multiple regions have only one endpoint located at the center of a virtual circle, and the virtual circle is concentric with the cross-section of the isononanol hydroformylation reactor. The top projection of the heat exchange tube 503 in each region can overlap with the top projection of the heat exchange tube 503 in the adjacent region when it is rotated around the center of the circle by a set angle.

[0040] Specifically, the plurality of regions are rotationally symmetrical figures relative to the center of the circle.

[0041] In this embodiment, the top projection of the axis of each heat exchange tube 503 is a straight line, and the top projections of all the heat exchange tubes 503 are divided into a plurality of sector-shaped areas 512. The plurality of sector-shaped areas 512 are concentric and can form a circle. The top projection of the heat exchange tube 503 in each sector-shaped area 512 can coincide with the top projection of the heat exchange tube 503 in the adjacent sector-shaped area 512 when the heat exchange tube 503 is rotated around the center of the circle at the same angle as the central angle of the circle.

[0042] Specifically, the heat exchange tubes 503 are arranged vertically, and their top projections are straight lines. The top projections of the multiple heat exchange tubes 503 are divided into multiple fan-shaped areas 512. A number of heat exchange tubes 503 are distributed in each fan-shaped area 512. When a fan-shaped area 512 rotates around the center of the circle at an angle equal to the central angle of the fan-shaped area 512, the top projection of the heat exchange tubes 503 in the fan-shaped area 512 coincides with the top projection of the heat exchange tubes 503 in the adjacent fan-shaped area 512. Then, the multiple fan-shaped areas 512 form a circular array arrangement. Such an arrangement makes the distribution of the multiple heat exchange tubes 503 in the circumferential direction more uniform, which is conducive to uniform heat extraction.

[0043] Optionally, the area is a sector-shaped area 512, and the central angle of each sector-shaped area 512 is 6°-60°.

[0044] Specifically, in theory, any integer equally divided angle of 360° can be used as the center angle of the above-mentioned fan-shaped area 512. However, due to the difficulty of engineering manufacturing and other reasons, 6°-60° is selected as the center angle of the above-mentioned fan-shaped area 512. A too small center angle will cause the heat exchange tubes 503 in the fan-shaped area 512 to be distributed too densely, which is not conducive to construction. A too large center angle will cause the heat exchange tubes 503 to have poor distribution uniformity, which is not conducive to uniform heat exchange.

[0045] In one embodiment, Figure 2 As shown, the central angle of each sector-shaped area 512 is 6°, and the complete top-view projection circle is divided into 60 sector-shaped areas 512 .

[0046] In another embodiment, Figure 3 As shown, the central angle of each sector-shaped area 512 is 60°, and the complete top-view projection circle is divided into 6 sector-shaped areas 512 .

[0047] Optionally, the heat exchange medium flowing in the heat exchange tube 503 is deoxygenated water.

[0048] Specifically, the heat exchange medium is deoxygenated water, which can generate steam latent heat to extract heat, or directly generate sensible heat to extract heat.

[0049] Optionally, at least two distribution plates 506 are provided, and the at least two distribution plates 506 are arranged at intervals in the vertical direction, and the interval between adjacent distribution plates 506 is 1000-5000 mm.

[0050] Specifically, according to the different flow rates of the gas-liquid reaction medium on the reaction side, the spacing of the distribution plates 506 is set to 1000mm-5000mm. Too small a spacing will cause excessive pressure drop of the gas-liquid reaction medium flow, while too large a spacing will cause vibration of the heat distribution structure.

[0051] Optionally, the aperture of the positioning through hole 507 matches the outer diameter of the heat exchange tube 503 .

[0052] Specifically, the heat exchange tube 503 is inserted into the positioning through hole 507 , and the positioning through hole 507 supports and positions the heat exchange tube 503 , thereby improving the overall strength and stability of the heat distribution structure.

[0053] In this embodiment, the distribution structure includes a plurality of circular first distribution through holes 513 , and the plurality of first distribution through holes 513 are opened on the distribution plate 506 .

[0054] Specifically, Figure 4 As shown, the distribution structure is a plurality of first distribution through holes 513, which are circular holes and are staggeredly distributed on the distribution plate 506. The opening rate of the first distribution holes is 5%-20%. The first distribution holes are for gas-liquid reaction medium to pass through, and can evenly distribute the gas-liquid reaction medium in the reactor.

[0055] In another embodiment, the distribution structure includes a plurality of second distribution through holes 514 in a long waist shape, and the plurality of second distribution through holes 514 are opened on the distribution plate 506 .

[0056] Specifically, Figure 5 As shown, the distribution structure is a plurality of second distribution through holes 514, which are long waist holes and are distributed in a rectangular array on the distribution plate 506. The opening rate of the second distribution holes is 5%-20%, and the second distribution holes are for gas-liquid reaction medium to pass through, so as to evenly distribute the gas-liquid reaction medium in the reactor.

[0057] In another embodiment, the distribution plate 506 is a wedge-shaped bar welded mesh plate 515, and the strips of the wedge-shaped bar welded mesh plate 515 form a distribution structure.

[0058] Specifically, Figure 6 As shown, a wedge-shaped bar welded screen plate 515 is used as the distribution plate 506, and the strip seams of the wedge-shaped bar welded screen plate 515 form a distribution structure, which has a mixing effect of compressing and expanding the lower incoming flow.

[0059] Further, according to the distribution requirements of the gas-liquid reaction medium, 1-3 layers of distribution plates 506 may be provided, including but not limited to the following solutions: using a single layer such as Figure 4 The distribution plate 506 with the first distribution through hole 513 shown in FIG. Figure 5 The distribution plate 506 with the second distribution through hole 514 shown in FIG. Figure 6 The wedge-shaped bar welded screen plate 515 shown is used as the distribution plate 506, any two of the above three distribution plates 506 are used in combination, and the above three distribution plates 506 are used in combination.

[0060] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A heat extraction distribution structure for an isononanol hydroformylation reactor, characterized in that: include: An inner tube box and an outer tube box, wherein the inner tube box is arranged inside the outer tube box, a heat medium inlet cavity is formed inside the inner tube box, and a heat medium outlet cavity is formed between the inner tube box and the outer tube box; A plurality of heat exchange tubes, wherein the heat exchange tubes are U-shaped tubes, and the two ends of the heat exchange tubes are respectively a heat medium inlet and a heat medium outlet, and the heat medium inlet and the heat medium outlet are respectively connected to the heat medium inlet chamber and the heat medium outlet chamber; At least one distribution plate is provided with a plurality of positioning through holes and a distribution structure, and each of the heat exchange tubes passes through two of the positioning through holes.

2. The heat extraction distribution structure for isononanol hydroformylation reactor according to claim 1, characterized in that: A bottom plate and a cover plate are respectively provided at both ends of the inner tube box and the outer tube box, the heat medium inlet and the heat medium outlet are connected to the bottom plate, and a heat medium main inlet and a heat medium main outlet are respectively provided on the cover plate and are connected to the heat medium inlet cavity and the heat medium outlet cavity.

3. The heat extraction distribution structure for isononanol hydroformylation reactor according to claim 1, characterized in that: The top projection of the axis of each heat exchange tube is a straight line, and the top projections of all the heat exchange tubes are divided into a plurality of regions of the same shape, and the plurality of regions have only one endpoint located at the center of a virtual circle, and the virtual circle is concentric with the cross section of the isononanol hydroformylation reactor, and the top projection of the heat exchange tube in each region can overlap with the top projection of the heat exchange tube in an adjacent region when rotating around the center of the circle by a set angle.

4. The heat extraction distribution structure for isononanol hydroformylation reactor according to claim 3, characterized in that: The area is a sector-shaped area, and the central angle of each sector-shaped area is 6°-60°.

5. The heat extraction distribution structure for isononanol hydroformylation reactor according to claim 1, characterized in that: The heat exchange medium flowing in the heat exchange tube is deoxygenated water.

6. The heat extraction distribution structure for isononanol hydroformylation reactor according to claim 1, characterized in that: At least two distribution plates are provided, and at least two distribution plates are arranged at intervals in the vertical direction, and the spacing between adjacent distribution plates is 1000-5000 mm.

7. The heat extraction distribution structure for isononanol hydroformylation reactor according to claim 1, characterized in that: The aperture of the positioning through hole matches the outer diameter of the heat exchange tube.

8. The heat extraction distribution structure for isononanol hydroformylation reactor according to claim 1, characterized in that: The distribution structure comprises a plurality of circular first distribution through holes, and the plurality of first distribution through holes are opened on the distribution plate.

9. The heat extraction distribution structure for isononanol hydroformylation reactor according to claim 1, characterized in that: The distribution structure comprises a plurality of second distribution through holes in a long waist shape, and the plurality of second distribution through holes are arranged on the distribution plate.

10. The heat extraction distribution structure for isononanol hydroformylation reactor according to claim 1, characterized in that: The distribution plate is a wedge-shaped bar welded screen plate, and the strip seams of the wedge-shaped bar welded screen plate form the distribution structure.

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