Novel catalyst recovery device for DMM esterification

Abstract

The utility model discloses a novel catalyst recovery device for DMM esterification, relates to the field of catalyst recovery, and solves the problems that a zeolite molecular sieve in a reaction kettle is mounted in a bolt fastening manner, the dismounting operation is tedious, and the operation manner of dismounting, recovering and recycling the zeolite molecular sieve by an operator wastes time and labor; a catalytic recovery structure is arranged in the reaction kettle and the reaction kettle, the catalytic recovery structure comprises a cover frame, a zeolite molecular sieve and a bottom ring, the top of the reaction kettle is open, a plurality of annularly distributed inner frames are fixedly connected to the top of the bottom ring arranged in the reaction kettle, and matched cover frames are mounted on the outer surfaces of the inner frames; a placement groove is formed between the inner frame and the cover frame, and the zeolite molecular sieve is placed in the placement groove; a stirring structure is mounted in the reaction kettle, the inner wall of the reaction kettle has a limiting effect, and the cover frame is limited to be opened towards the outside, so that the zeolite molecular sieve is fixed, and the zeolite molecular sieve is more convenient to disassemble and assemble and is convenient to recycle.

Description

Technical Field

[0001] The utility model relates to the field of catalyst recovery, in particular to a novel DMM esterification catalyst recovery device. Background Art

[0002] Solid molecular sieve catalysts catalyze the esterification of maleic anhydride with methanol to synthesize dimethyl maleate. Zeolite molecular sieves are particularly effective in catalyzing the synthesis of dimethyl maleate, with high catalytic activity and good selectivity. Appropriate increases in the reaction temperature, molar ratio of alcohol to anhydride, and zeolite catalyst dosage all favor the formation of dimethyl maleate.

[0003] The existing installation method of the zeolite molecular sieve inside the reactor adopts the bolt fastening method, which makes the disassembly operation cumbersome and the operator's disassembly, recycling and reuse of the zeolite molecular sieve is time-consuming and laborious. Utility Model Content

[0004] The purpose of the utility model is to provide a new DMM esterification catalyst recovery device that is more convenient for disassembly and installation of zeolite molecular sieves and convenient for recycling and reuse, which can solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a novel catalyst recovery device for DMM esterification, comprising a reactor and a catalytic recovery structure arranged inside the reactor, the catalytic recovery structure comprising a cover frame, a zeolite molecular sieve and a bottom ring, the top of the reactor being open, the top of the bottom ring arranged inside the reactor being fixedly connected to a plurality of annularly distributed inner frames, a matching cover frame being installed on the outer surface of the inner frame, a placement groove being provided between the inner frame and the cover frame, and the zeolite molecular sieve being placed inside the placement groove; a stirring structure being installed inside the reactor.

[0006] Preferably, the inner diameter of the reactor is equal to the outer diameter of the bottom ring, a top plate is provided above the bottom ring, the bottom of the top plate is fixedly connected to the top of the inner frame, and a cover plate is installed above the top plate. The cover plate can cover the open top of the reactor to prevent the raw materials from splashing and moving out during the internal stirring preparation process.

[0007] Preferably, the stirring structure includes a motor, a bracket is fixedly connected to the bottom of the reactor, a motor is installed at the center of the bottom of the reactor, the output end of the motor passes through the bottom of the reactor and is connected to a stirring shaft, and a plurality of stirring blades are fixedly connected to the outer wall of the stirring shaft. The stirring shaft can drive the stirring blades to rotate in a circle, thereby disturbing the reactant raw materials and making them mixed evenly.

[0008] Preferably, the top of the stirring shaft is fixedly connected to a hexagonal plate, and a matching hexagonal groove is opened at the center of the bottom of the top plate. The top of the top plate is rotatably connected to the bottom of the cover plate through the main shaft. The cover plate is fixedly connected with a lifting ring, which drives the installed zeolite molecular sieve to rotate. The rotating zeolite molecular sieve is in full contact with the raw material, thereby improving the reaction catalytic effect. The lifting ring uses a matching lifting machine to lift the entire cover plate 202 vertically.

[0009] Preferably, the cover frame and the inner frame are in an arc shape, the height of the inner frame is less than the internal depth of the reactor, the outer wall of the top of the cover frame is fixedly connected to the limiting block, the outer wall of the limiting block is in an arc chamfer, and the outer arc chamfer of the limiting block contacts the inner wall of the reactor, which is a tangential contact. The contact area is small and the friction is low, and the possibility of wear is reduced, thereby preventing the cover frame from directly contacting the inner wall of the reactor during the rotation process and causing wear.

[0010] Preferably, a notch is provided at the bottom of the cover frame, and a pad is fixedly connected to the outer side wall of the bottom of the inner frame. A rotating shaft is rotatably connected inside the pad, and a clamp is fixedly connected to the other end of the rotating shaft. The clamp is connected to the side wall of the adjacent notch, and a torsion spring is arranged around the outer side walls at both ends of the rotating shaft. One end of the torsion spring is fixedly connected to the outer side wall of the rotating shaft, and the other end is fixedly connected to the side wall of the clamp. The inner wall of the reactor does not limit the outside of the cover frame, and is subjected to the rebound force of the torsion spring, thereby squeezing the cover frame to flip toward the outside, and does not need to be manually flipped open.

[0011] Compared with the prior art, the beneficial effects of the present invention are: the inner wall of the reactor has a limiting effect, which restricts the cover frame from opening toward the outside, thereby completing the fixation of the zeolite molecular sieve, making the disassembly and installation operations of the zeolite molecular sieve more convenient, and convenient for recycling and reuse. The installation operation process saves time and effort, and provides convenience for replacing the zeolite molecular sieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model from another angle;

[0014] Figure 3 This is a three-dimensional enlarged structural diagram of the catalytic recovery structure in the utility model;

[0015] Figure 4 This is a schematic diagram of a three-dimensional enlarged structure of the stirring structure in the present utility model;

[0016] Figure 5 This is an enlarged structural diagram of the top plate of the utility model when viewed from above;

[0017] Figure 6 This is a three-dimensional enlarged schematic diagram of the catalytic recovery structure in the utility model from another angle.

[0018] Figure 7 for Figure 3 Schematic diagram of the locally enlarged structure at point A in the middle.

[0019] In the figure: 1. Reactor; 2. Catalytic recovery structure; 201. Cover frame; 202. Cover plate; 203. Zeolite molecular sieve; 204. Bottom ring; 205. Top plate; 206. Inner frame; 207. Placement groove; 208. Clamping block; 209. Spacer; 2010. Torsion spring; 2011. Notch; 2012. Rotating shaft; 3. Stirring structure; 301. Lifting ring; 302. Main shaft; 303. Limiting block; 304. Stirring shaft; 305. Motor; 306. Stirring blade; 307. Hexagonal plate; 308. Hexagonal groove; 4. Bracket. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 6 The figure shows a novel catalyst recovery device for DMM esterification, comprising a reactor 1 and a catalytic recovery structure 2 arranged inside the reactor 1. The catalytic recovery structure 2 comprises a cover frame 201, a zeolite molecular sieve 203 and a bottom ring 204. The top of the reactor 1 is open. The top of the bottom ring 204 arranged inside the reactor 1 is fixedly connected to a plurality of annular inner frames 206. A matching cover frame 201 is installed on the outer surface of the inner frame 206. A placement groove 207 is provided between the inner frame 206 and the cover frame 201. The zeolite molecular sieve 203 is placed in It should be noted that the inside of the placement groove 207 can be separated and opened from the inner frame 206, and the multiple zeolite molecular sieves 203 are placed inside the placement groove 207, and then the entire bottom ring 204 is placed on the inner wall of the reactor 1 for use. The inner wall of the reactor 1 limits the opening of the cover frame 201 toward the outside, thereby completing the fixation of the zeolite molecular sieve 203. The disassembly and installation operations of the zeolite molecular sieve 203 are more convenient, and it is convenient for recycling and reuse. The installation operation process saves time and effort, and provides convenience for replacing the zeolite molecular sieve 203.

[0022] See also Figure 1 and Figure 2The inner diameter of the reactor 1 is equal to the outer diameter of the bottom ring 204. A top plate 205 is provided above the bottom ring 204. The bottom of the top plate 205 is fixedly connected to the top of the inner frame 206. A cover plate 202 is installed above the top plate 205. It should be noted that the bottom ring 204 is equal to the inner diameter of the reactor 1 and can be slid into the interior of the reactor 1. The cover plate 202 can cover the open top of the reactor 1 to prevent the raw materials from splashing and overflowing during the internal stirring preparation process.

[0023] See Figure 2 and Figure 4 A stirring structure 3 is installed inside the reactor 1, and the stirring structure 3 includes a motor 305. A bracket 4 is fixedly connected to the bottom of the reactor 1. The motor 305 is installed at the center of the bottom of the reactor 1. The output end of the motor 305 passes through the bottom of the reactor 1 and is connected to a stirring shaft 304. The outer wall of the stirring shaft 304 is fixedly connected to a number of stirring blades 306. It should be noted that when the motor 305 is turned on, the stirring shaft 304 can drive the stirring blades 306 to rotate in a circle, thereby disturbing the reactant raw materials and making them mixed evenly.

[0024] See Figure 3 、 Figure 4 and Figure 5 The top of the stirring shaft 304 is fixedly connected to the hexagonal plate 307, and a matching hexagonal groove 308 is opened at the center position of the bottom of the top plate 205. The top of the top plate 205 is rotatably connected to the bottom of the cover plate 202 through the main shaft 302, and the cover plate 202 is fixedly connected with a lifting ring 301. It should be noted that during the assembly process of the bottom ring 204, the hexagonal plate 307 can be set in the hexagonal groove 308. The rotation process of the stirring shaft 304 can drive the top plate 205 to rotate synchronously, thereby driving the installed zeolite molecular sieve 203 to rotate, and the rotating zeolite molecular sieve 203 is fully in contact with the raw materials, thereby improving the reaction catalytic effect. The lifting ring 301 uses a matching lifting machine to lift the entire cover plate 202 vertically, so that the zeolite molecular sieve 203 can be removed from the interior of the reactor 1 after use, without the need for manpower lifting, thereby completing convenient disassembly.

[0025] See Figure 3 and Figure 6 The cover frame 201 and the inner frame 206 are in an arc shape. The height of the inner frame 206 is less than the internal depth of the reactor 1. The outer wall of the top of the cover frame 201 is fixedly connected to the limiting block 303. The outer wall of the limiting block 303 is in an arc chamfer. It should be noted that the outer arc chamfer of the limiting block 303 contacts the inner wall of the reactor 1, and the contact is tangential. The contact area is small and the friction is low, and the possibility of wear is reduced, which prevents the cover frame 201 from directly contacting the inner wall of the reactor 1 during the rotation process and causing wear.

[0026] See Figure 3 and Figure 7The bottom of the cover frame 201 is provided with a notch 2011, the outer wall of the bottom of the inner frame 206 is fixedly connected to the pad 209, the pad 209 is rotatably connected to the shaft 2012, the other end of the shaft 2012 is fixedly connected to the clamping block 208, the clamping block 208 is connected to the side wall of the adjacent notch 2011, and the outer walls of both ends of the shaft 2012 are surrounded by a torsion spring 2010, one end of the torsion spring 2010 is fixedly connected to the outer wall of the shaft 2012, and the other end is fixedly connected to the side wall of the clamping block 208. It should be noted that when the entire cover frame 201 is removed from the interior of the reactor 1, so that the inner wall of the reactor 1 does not limit the outer side of the cover frame 201. The cover frame 201 is squeezed and flipped toward the outside by the rebound force of the torsion spring 2010. There is no need to manually flip it open, and the zeolite molecular sieve 203 can be directly replaced in a cycle. During the installation process, the bottom ring 204 presses down with gravity, and the cover frame 201 is squeezed and separated from the open side wall of the reactor 1, pushing the cover frame 201 to merge with the inner frame 206. No human push is required, and the operation is more convenient.

[0027] Working principle: During the replacement operation of zeolite molecular sieve 203, the entire cover plate 202 is lifted vertically by a supporting lifting machine. When the entire cover frame 201 is moved out of the reactor 1, the inner wall of the reactor 1 does not limit the outer side of the cover frame 201. The torsion spring 2010 rebounds and squeezes the cover frame 201 to flip it toward the outside. There is no need to manually flip it open. The zeolite molecular sieve 203 is manually taken out for replacement. During the installation process, the bottom ring 204 moves to the interior of the reactor 1 under its own gravity. The cover frame 201 is squeezed and separated by the open side wall of the reactor 1, pushing the cover frame 201 to merge with the inner frame 206.

[0028] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include" or "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel catalyst recovery device for DMM esterification, comprising a reactor (1) and a catalyst recovery structure (2) arranged inside the reactor (1), characterized in that: The catalytic recovery structure (2) comprises a cover frame (201), a zeolite molecular sieve (203) and a bottom ring (204); the top of the reactor (1) is open; the top of the bottom ring (204) arranged inside the reactor (1) is fixedly connected to a plurality of annularly distributed inner frames (206); a matching cover frame (201) is installed on the outer surface of the inner frame (206); a placement groove (207) is provided between the inner frame (206) and the cover frame (201); and the zeolite molecular sieve (203) is placed inside the placement groove (207); A stirring structure (3) is installed inside the reactor (1).

2. A novel DMM esterification catalyst recovery device according to claim 1, characterized in that: The inner diameter of the reactor (1) is equal to the outer diameter of the bottom ring (204); a top plate (205) is provided above the bottom ring (204); the bottom of the top plate (205) is fixedly connected to the top of the inner frame (206); and a cover plate (202) is installed above the top plate (205).

3. A novel DMM esterification catalyst recovery device according to claim 2, characterized in that: The stirring structure (3) comprises a motor (305), a bracket (4) is fixedly connected to the bottom of the reactor (1), the motor (305) is installed at the center of the bottom of the reactor (1), the output end of the motor (305) passes through the bottom of the reactor (1) and is connected to a stirring shaft (304), and a plurality of stirring blades (306) are fixedly connected to the outer wall of the stirring shaft (304).

4. A novel DMM esterification catalyst recovery device according to claim 3, characterized in that: The top of the stirring shaft (304) is fixedly connected to a hexagonal plate (307), a matching hexagonal groove (308) is provided at the center of the bottom of the top plate (205), the top of the top plate (205) is rotatably connected to the bottom of the cover plate (202) through the main shaft (302), and the cover plate (202) is fixedly connected to a hanging ring (301).

5. A novel DMM esterification catalyst recovery device according to claim 1, characterized in that: The cover frame (201) and the inner frame (206) are in an arc shape. The height of the inner frame (206) is less than the inner depth of the reactor (1). The outer side wall of the top of the cover frame (201) is fixedly connected to the limiting block (303). The outer side wall of the limiting block (303) is in an arc chamfer.

6. A novel DMM esterification catalyst recovery device according to claim 1, characterized in that: The bottom of the cover frame (201) is provided with a notch (2011), the outer side wall of the bottom of the inner frame (206) is fixedly connected to a cushion block (209), the interior of the cushion block (209) is rotated to be connected to a rotating shaft (2012), the other end of the rotating shaft (2012) is fixedly connected to a clamping block (208), the clamping block (208) is connected to the side wall of the adjacent notch (2011), and a torsion spring (2010) is arranged around the outer side walls of both ends of the rotating shaft (2012), one end of the torsion spring (2010) is fixedly connected to the outer side wall of the rotating shaft (2012), and the other end is fixedly connected to the side wall of the clamping block (208).

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