WO2021254192A1

WO2021254192A1 - Catalytic auxiliary device for gas-phase aldehyde hydrogenation reactor

Info

Publication number: WO2021254192A1
Application number: PCT/CN2021/098578
Authority: WO
Inventors: 周强; 李刚; 周卫家; 吴丹平; 曾文刚; 张胜飞
Original assignee: 宁波巨化化工科技有限公司
Priority date: 2020-06-19
Filing date: 2021-06-07
Publication date: 2021-12-23
Also published as: CN111701541A; CN111701541B

Abstract

Disclosed is a catalytic auxiliary device for a gas-phase aldehyde hydrogenation reactor, the device comprising a shell and tube reactor, in which a catalyst preloader is arranged to reduce a contact surface and increase a ventilation stroke. According to the catalytic auxiliary device for a gas-phase aldehyde hydrogenation reactor, a space inside a pipeline of the shell and tube reactor is separated into a plurality of spiral regions by means of spiral partitions, which forms a longer reaction space within the same length, such that a reaction is more sufficient; in addition, fixing frames are arranged between the spiral partitions, wherein the space between two fixing frames can restrict a certain size of catalyst particles, and smaller particles can be discharged through screening holes on the fixing frames, thus forming particles with similar meshes and leaving no excess particles in contact between two adjacent particles, so as to increase the contact area of a catalyst and thus increase the reaction efficiency.

Description

Catalytic auxiliary device for gas phase aldehyde hydrogenation reactor

Technical field

The invention relates to the technical field of reactors, in particular to a catalytic auxiliary device for a gas phase aldehyde hydrogenation reactor.

Background technique

The gas-phase aldehyde hydrogenation reaction requires a catalyst to increase the reaction, thereby increasing the reaction speed and conversion rate. The catalyst is usually filled in the tube converter one by one, or between each tube converter. The gap is blocked and then filled at one time. Because the diameter of the catalyst particles is different, the two methods are filled randomly. The smaller particles will exist between the larger particles, although the total surface area of the particles is increased. , But make the gap between the particles smaller, which leads to a decrease in the air flow rate, which reduces the contact area of the reaction, and the contact area between the particles is too much, resulting in waste, and the ventilation rate will be reduced, which will slow the reaction. . For this reason, we propose a catalytic auxiliary device for gas phase aldehyde hydrogenation reactor.

Summary of the invention

The object of the present invention is to provide a catalytic auxiliary device for a gas phase aldehyde hydrogenation reactor that is convenient to install a catalyst and increases the reaction rate by reducing the contact surface and increasing the aeration stroke, so as to solve the problems raised in the background art.

In order to achieve the above objective, the present invention provides the following technical solution: a catalytic auxiliary device for a gas-phase aldehyde hydrogenation reactor, comprising a tube-and-tube reactor in which a catalyst that reduces the contact surface and increases the aeration stroke is provided Pre-installed.

Preferably, the catalyst pre-installer includes a main bone rod, a plurality of sets of spiral partitions are connected to the main bone rod, and a plurality of sets of fixed racks that contain the catalyst and are arranged obliquely are connected between the adjacent spiral partitions. The main bone rod is also provided with multiple sets of locking devices, and the fixing frame is provided with multiple sets of placement holes and screening holes. The screening holes can screen out the smaller particles between the two catalysts, thereby reducing The small contact area between the catalysts increases the contact area with the reactants.

Preferably, the locking device includes a rotating shaft rotatably connected with the main bone rod through a bearing, multiple sets of driving wedges are provided on the rotating shaft, and a slideway is also connected between the main bone rod and the spiral partition . A strut slidably connected with the driving wedge is slidably connected in the slideway, and the locking device achieves tightening by changing the distance between the strut and the pipe wall of the tube reactor, which facilitates a stable response.

Preferably, the edge of the placement hole is also provided with a gas-permeable groove to reduce the contact area between the placement hole and the catalyst particles.

Preferably, one end of the rotating shaft is connected with a threaded block threadedly connected with the main bone rod, and the threaded block is fixedly connected with a rotating block, the threaded block is convenient for self-locking and can be stably locked.

Preferably, an isolation pad is also connected to the edge of the spiral partition, and a buffer pad is fixedly connected to one end of the strut to prevent damage to the pipe wall of the tubular reactor.

Preferably, a pull-out ring is rotatably connected to one end of the main bone rod to facilitate the removal of the device.

Preferably, the end of the main bone rod is also provided with a protective plate connected to the tube reactor, and the protective plate is provided with vent holes to prevent the catalyst on the topmost fixing frame from overflowing.

Compared with the prior art, the beneficial effects of the present invention are:

In the present invention, the space in the pipes of the tube reactor is separated into multiple spiral regions through spiral partitions, forming a longer reaction space within the same length, so that the reaction is more sufficient, and the spiral partitions are arranged between the spiral partitions. The fixed frame, the space between the two fixed frames can limit the catalyst particles of a certain size, and the screening holes on the fixed frame can discharge smaller particles, thus forming particles of similar mesh size, and making the two adjacent particles There is no contact between excess particles, which increases the contact area of the catalyst and improves the reaction efficiency.

Description of the drawings

Figure 1 is a schematic diagram of part of the structure of the tube reactor;

Figure 2 is a schematic diagram of the installation state of the catalyst preloader;

Figure 3 is a schematic diagram of a partial half-section structure of a reaction tube;

Figure 4 is a schematic diagram of the overall structure of the catalyst preloader;

Figure 5 is a schematic view showing the structure of the catalyst preloader with the fixing frame removed;

Figure 6 is a schematic cross-sectional view of the main bone rod;

Fig. 7 is an enlarged schematic diagram of the structure of area A in Fig. 6;

Figure 8 is a schematic diagram of the spiral partition structure;

Figure 9 is a schematic diagram of the front structure of the fixing frame.

In the picture: 1-tube reactor; 2-catalyst pre-installer; 3-main bone rod; 4-helical partition; 5-fixed frame; 6-locking device; 7-placement hole; 8-screening hole; 9-rotating shaft; 10-drive wedge; 11-slide; 12-strut; 13-venting groove; 14-threaded block; 15-rotating block; 16-isolation pad; 17-buffer pad; 18-protection board ; 19-Vent; 20-Pull-out ring; 21-Fixed plate; 22-Reaction tube.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Please refer to Figures 1-9, the present invention provides a technical solution: a catalytic auxiliary device for gas phase aldehyde hydrogenation reactor, comprising a tubular reactor 1, the tubular reactor 1 part of the structure of the reactor, that is, two The fixed plate 21 at the end and the reaction tube 22 are formed. The tubular reactor 1 is provided with a catalyst preloader 2 that reduces the contact surface and increases the aeration stroke. The catalyst preloader 2 changes the space stroke of the reaction, thereby Improve the conversion rate of the reaction, and can also change the spacing between the catalyst particles, thereby reducing the contact area between the particles and improving the catalytic efficiency.

Among them, the catalyst preloader 2 includes a main bone rod 3, and a plurality of sets of spiral partitions 4 are connected to the main bone rod 3. The length of the reaction tube 22 is equivalent to increasing the time of the catalytic reaction, thereby increasing the conversion rate. The spiral partition 4 is preferably three groups, and the edge of the spiral partition 4 is also connected with an isolation pad 16 to facilitate the distance reaction. There is a gap of 0.5-1mm on the inner wall of the tube 22, and an isolation pad 16 is arranged in the gap. The isolation pad 16 can improve a certain degree of sealing and prevent the reaction gas from directly passing through the gap, causing the stroke to be shortened, and the isolation pad 16 is in contact with the reaction tube 22 A sliding pad is set on one side of the tube to reduce friction. It is convenient for the device to be installed in the reaction tube 22. The adjacent spiral partitions 4 are connected with multiple sets of fixed racks 5 that contain the catalyst and are arranged obliquely. Too many particles result in a reduction in the flow area of the reactant gas flow, and the contact area between the particles is too large, resulting in a reduction in the efficiency of the catalyst. The main bone rod 3 is also provided with multiple sets of locking devices 6 and locking devices 6 It is convenient to fix the entire device to prevent instability caused by fluctuations during the reaction. The fixing frame 5 is provided with multiple sets of placement holes 7 and screening holes 8, and the adjacent fixing frames 5 in the up and down direction can be screened for the first time. Larger particles can be removed, and the smaller catalyst particles can be screened out by placing hole 7 so as to leave catalyst particles with similar meshes. Screening hole 8 prevents small particles between two or more adjacent catalyst particles. The catalyst particles, thereby reducing or even eliminating the contact surface between the catalyst particles, improving the utilization rate of the catalyst, and because the placement hole 7 and the fixing frame 5 are arranged, compared with the direct propulsion of the catalyst, the flow of the reaction gas can be achieved The area is larger to increase the reaction rate. The placement hole 7 can be circular, or triangular or square, and other shapes.

The locking device 6 includes a rotating shaft 9 rotatably connected to the main bone rod 3 through a bearing. A plurality of sets of driving wedges 10 are arranged on the rotating shaft 9. The driving wedge 10 is preferably arranged in three groups, and the rotating shaft 9 makes the drive The wedge 10 rotates along with it, and a slideway 11 is also connected between the main bone rod 3 and the spiral partition 4. The slideway 11 is slidably connected with a support rod 12 that is slidably connected to the driving wedge 10, and the support rod 12 can be gradually pushed to slide in the slideway 11 after the driving wedge 10 rotates, so that the support rod 12 gradually moves toward the reaction tube The inner wall of 22 is close, and finally multiple sets of spreading strokes are locked. One end of the strut 12 is fixedly connected with a buffer pad 17, which can increase friction and can also play a certain buffer to prevent the strut 12 from reacting. The inner wall of the tube 22 is damaged.

In addition, the edge of the placement hole 7 is also provided with a ventilation groove 13. The arc-shaped ventilation groove 13 can further reduce the contact area between the placement hole 7 and the catalyst particles, thereby increasing the utilization rate of the catalyst.

One end of the rotating shaft 9 is connected with a threaded block 14 threadedly connected to the main bone rod 3, and a rotating block 15 is fixedly connected to the threaded block 14. The threaded connection of the rod 3 is convenient for self-locking, and is stable after being rotated, so that the support rod 12 is kept in a locked state.

One end of the main bone rod 3 is rotatably connected with a pull-out ring 20, the pull-out ring 20 is convenient to take out the device, and the end of the main bone rod 3 is also provided with a protective plate 18 connected to the tube reactor 1. The protective plate Vent holes 19 are opened on the 18, because the catalyst may have exothermic reactions during the catalytic reaction, and there may be fluctuations. Therefore, the protective plate 18 prevents the catalyst particles on the top layer from becoming unstable. The vent holes 19 facilitate the flow of the reaction gas. Through.

Working principle: First place the device in the catalyst particle pile and rotate it for a few times. The larger catalyst particles cannot enter between the two adjacent fixing frames 5 in the up and down direction, while the smaller one will pass through the screening hole 8. Because the fixed frame 5 is arranged obliquely, the smaller particles of the next layer discharged when the device is taken out will continuously fall downward or roll out of the inclined surface, and finally the fixed frame 5 retains similar meshes The catalyst particles, take the device by pulling out the ring 20, and place it in the reaction tube 22, and the more preferable way is screwing in to prevent the frontal impact on the isolation pad 16 and causing damage. After placing it, rotate it Rotating the block 15 causes the drive wedge 10 to push the strut 12 to be locked. When the device is taken out, the rotating block 15 is rotated in the opposite direction to loosen the strut 12.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply one of these entities or operations. There is any such actual relationship or order between. Moreover, the terms "including", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also those that are not explicitly listed Other elements of, or also include elements inherent to this process, method, article or equipment.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. And variations, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

A catalytic auxiliary device for a gas-phase aldehyde hydrogenation reactor, comprising a tubular reactor (1), characterized in that: the tubular reactor (1) is provided with a catalyst pre-installation that reduces the contact surface and increases the aeration stroke器(2).
A catalytic auxiliary device for a gas phase aldehyde hydrogenation reactor according to claim 1, characterized in that: the catalyst preloader (2) comprises a main bone rod (3), and the main bone rod (3) is connected to There are multiple sets of spiral partitions (4), adjacent to the spiral partitions (4) are connected with multiple sets of fixed racks (5) that contain catalysts and are arranged obliquely, and the main bone rod (3) is also provided There are multiple sets of locking devices (6), and multiple sets of placement holes (7) and screening holes (8) are opened on the fixing frame (5).
The catalytic auxiliary device for a gas phase aldehyde hydrogenation reactor according to claim 2, characterized in that: the locking device (6) comprises a rotating shaft (9) rotatably connected with the main bone rod (3) through a bearing, Multiple sets of driving wedges (10) are arranged on the rotating shaft (9), and a slideway (11) is also connected between the main bone rod (3) and the spiral partition (4).
A support rod (12) slidably connected with the driving wedge (10) is slidably connected in the slideway (11).
A catalytic auxiliary device for a gas phase aldehyde hydrogenation reactor according to claim 2, characterized in that: the edge of the placement hole (7) is also provided with a gas-permeable groove (13).
A catalytic auxiliary device for a gas phase aldehyde hydrogenation reactor according to claim 3, characterized in that: one end of the rotating shaft (9) is connected with a thread block (14) threadedly connected with the main bone rod (3), And a rotating block (15) is fixedly connected to the threaded block (14).
A catalytic auxiliary device for a gas phase aldehyde hydrogenation reactor according to claim 3, characterized in that: the edge of the spiral partition (4) is also connected with an isolation pad (16), and the support rod (12) A buffer pad (17) is fixedly connected to one end.
A catalytic auxiliary device for a gas phase aldehyde hydrogenation reactor according to claim 5, characterized in that: one end of the main bone rod (3) is rotatably connected with a pull-out ring (20).
A catalytic auxiliary device for a gas phase aldehyde hydrogenation reactor according to claim 7, characterized in that: the end of the main bone rod (3) is also provided with a protective plate ( 18) The protective plate (18) is provided with a vent hole (19).