Dimethyl maleate synthesis reaction device

Abstract

The utility model discloses a dimethyl maleate synthesis reaction device, which relates to the field of chemical production and comprises a supporting mechanism, the supporting mechanism comprises a partition plate, a synthesis reaction mechanism is arranged on the partition plate and comprises two reaction bins arranged above and below the partition plate, and a heating mechanism is arranged on the outer side of each reaction bin. The heating mechanism comprises jacket shells fixed above and below the partition plate, a plurality of supporting blocks are fixed above and below the partition plate, fixing plates are fixed outside the supporting blocks, heat conduction supporting columns are fixed outside the fixing plates, heat medium communicating pipes are fixed on one sides of the jacket shells, and stirring mechanisms are arranged on the heat conduction supporting columns. The device has the beneficial effects that the single-esterification reaction bin and the double-esterification reaction bin are stacked, so that the transfer distance of a composition is reduced, and the composition is heated inside and outside by jacket shells arranged on the outer sides of the single-esterification reaction bin and the double-esterification reaction bin and heat-conducting supporting columns inside the single-esterification reaction bin and the double-esterification reaction bin; and under the cooperation of the stirring mechanism, the composition can be uniformly heated.

Description

Technical Field

[0001] The utility model relates to the field of chemical production, in particular to a dimethyl maleate synthesis reaction device. Background Art

[0002] Dimethyl maleate (DMM), commonly known as dimethyl maleate, is a colorless viscous liquid and an important organic chemical raw material. It can be copolymerized with other substances to produce a variety of coatings, adhesives, optical materials, shrink-proof finishing agents, etc. with special properties and uses.

[0003] The existing industrial production of dimethyl maleate often uses maleic anhydride and methanol as raw materials, including monoesterification reaction and catalytic distillation double esterification reaction. Maleic anhydride and methanol are first put into a monoesterification reactor to generate monomethyl maleate, and then monomethyl maleate is put into a double esterification reactor, sulfuric acid is used as a catalyst, and monomethyl maleate is subjected to steam catalytic double esterification reaction to generate dimethyl maleate.

[0004] For example, the patent document with the announcement number CN221889905U discloses a production device for dimethyl maleate, including: a monomethyl ester reactor, a dimethyl ester reactor, and a catalytic distillation deep reactor; maleic anhydride and methanol are first mixed and then enter the monomethyl ester reactor to generate monomethyl maleate, and then the outlet material of the monomethyl ester reactor and the supplementary methanol are mixed and enter the dimethyl ester reactor, most of the monomethyl maleate is converted into dimethyl maleate, the outlet material of the dimethyl ester reactor enters the upper part of the reaction section of the catalytic distillation deep reactor, and the supplementary methanol is supplemented from the lower part of the reaction section of the catalytic distillation deep reactor, and the separation of methanol and ester is completed in the stripping section of the catalytic distillation deep reactor, and the methanol at the top of the tower is recycled, and in the reaction section, the monoester contacts with the rising methanol and reacts under the action of the catalyst, and the monoester is converted into a diester and flows out from the bottom of the tower as a raw material for subsequent processing steps. In the prior art, a single esterification reaction furnace and a double esterification reaction furnace need to be used separately for the synthesis reaction of dimethyl maleate. However, due to a certain distance between the two reaction furnaces, heat loss occurs during the reaction, which increases the energy consumption during the synthesis. Furthermore, uneven heating temperature during heating of raw materials leads to low reaction efficiency. A dimethyl maleate synthesis reaction device with reduced heat loss and improved heating uniformity is now proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a dimethyl maleate synthesis reaction device in order to solve the above problems.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] A dimethyl maleate synthesis reaction device comprises a supporting mechanism, the supporting mechanism comprises a partition plate, a fixed tube is fixedly connected to the partition plate, a synthesis reaction mechanism is arranged on the partition plate, the synthesis reaction mechanism comprises a monoesterification reaction chamber arranged above the partition plate, a diesterification reaction chamber is arranged below the partition plate, the monoesterification reaction chamber and the diesterification reaction chamber are symmetrically arranged, a heating mechanism is arranged outside the monoesterification reaction chamber and the diesterification reaction chamber, the heating mechanism comprises a jacket shell fixedly connected to the upper and lower sides of the partition plate and symmetrically arranged, a gap is formed between the jacket shell and the outer sides of the monoesterification reaction chamber and the diesterification reaction chamber, a plurality of symmetrically arranged supporting blocks are fixedly connected to the upper and lower sides of the partition plate, a fixed plate is fixedly connected to the outer side of the supporting block, a gap is formed between the fixed plate and the partition plate, a heat-conducting pillar is fixedly connected to the outer side of the fixed plate, a gap is formed between the heat-conducting pillar and the fixed tube, a heat medium connecting pipe is fixedly connected to one side of the jacket shell, the heat medium connecting pipe is externally connected to a heat medium source, and a stirring mechanism is arranged on both heat-conducting pillars.

[0008] Preferably, a first electric valve is fixedly connected to one side of the partition plate, and the upper surface of the upper fixed plate is set as an inclined surface inclined to the first electric valve, and the first electric valve connects the monoesterification reaction chamber with the diesterification reaction chamber.

[0009] Preferably, the stirring mechanism includes a plurality of connecting rings rotatably connected to the heat-conducting pillars, a rotating frame is fixedly connected to one side of the connecting ring, a plurality of rotating bevel gears evenly arranged in a circumference are rotatably connected to the other end of the rotating frame, a plurality of fixed bevel gears are fixedly connected to the heat-conducting pillars, the rotating bevel gears are meshed with the fixed bevel gears, a stirring blade is fixedly connected to the other end of the rotating bevel gears, and the other end face of the rotating frame is fixedly connected to another connecting ring.

[0010] Preferably, a motor is fixedly connected to the top of the monoesterification reaction chamber, a transmission shaft is sealingly and rotatably connected to the fixed tube, the output end of the motor is fixedly connected to the transmission shaft, and the transmission shaft is fixedly connected to the connecting rings at the upper and lower ends.

[0011] Preferably, an anhydride injection tube is fixedly connected to one side of the top of the monoesterification reaction chamber, and a maleic anhydride source is externally connected to the anhydride injection tube. A first methanol injection tube is fixedly connected to the lower end of the monoesterification reaction chamber, and the first methanol injection tube is connected to the interior of the monoesterification reaction chamber, and a methanol vapor source is externally connected to the first methanol injection tube.

[0012] Preferably, a finished product discharge pipe is fixedly connected to the bottom of the double esterification reaction chamber, a second electric valve is fixedly connected to the finished product discharge pipe, an acid catalyst injection pipe is fixedly connected to one side of the upper end of the double esterification reaction chamber, the acid catalyst injection pipe is connected to the inside of the double esterification reaction chamber, the acid catalyst injection pipe is externally connected to a sulfuric acid source, a second methanol injection pipe is fixedly connected to one side of the lower end of the double esterification reaction chamber, the second methanol injection pipe is connected to the inside of the double esterification reaction chamber, and the second methanol injection pipe is externally connected to a methanol vapor source.

[0013] The beneficial effects are:

[0014] 1. The stacking arrangement of the monoesterification reaction chamber and the diesterification reaction chamber reduces the distance of the synthetic material transfer. The jacket shell arranged outside the monoesterification reaction chamber and the diesterification reaction chamber and the internal heat-conducting support heat the synthetic material on both the inside and outside, and the synthetic material can be evenly heated with the cooperation of the stirring mechanism.

[0015] 2. Through the coordination of the fixed bevel gear and several rotating bevel gears, the rotating bevel gear can also be driven to rotate when it revolves, so that the raw materials can be stirred to make the esterification reaction more thorough, avoid incomplete reaction, and improve the reaction quality.

[0016] The additional technical features and advantages of the present invention will be more clearly explained in the following description, or can be understood through the specific practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0018] Figure 1 It is a stereoscopic diagram of a dimethyl maleate synthesis reaction device described in the utility model;

[0019] Figure 2 It is a stereoscopic diagram of the relative positions of a first methanol injection pipe and an acid catalyst injection pipe of a dimethyl maleate synthesis reaction device described in the utility model;

[0020] Figure 3 It is a front side cross-sectional view of a dimethyl maleate synthesis reaction device described in the utility model;

[0021] Figure 4 It is a stereoscopic diagram of the relative positions of the jacket shell and the partition plate of a dimethyl maleate synthesis reaction device described in the utility model;

[0022] Figure 5 This is a three-dimensional diagram of the stirring mechanism structure of a dimethyl maleate synthesis reaction device described in the utility model;

[0023] Figure 6 It is a three-dimensional diagram of the relative positions of the fixed bevel gear and the rotating bevel gear of the dimethyl maleate synthesis reaction device described in the utility model;

[0024] Figure 7 yes Figure 3 Enlarged view of point A in the middle.

[0025] The following are the descriptions of the reference numerals:

[0026] 101, partition plate; 102, fixed pipe; 103, support block; 104, first electric valve; 201, jacket shell; 202, heat medium connecting pipe; 203, heat-conducting support; 204, fixed plate; 301, motor; 302, transmission shaft; 303, connecting ring; 304, rotating frame; 305, rotating bevel gear; 306, fixed bevel gear; 307, stirring blade; 401, monoesterification reaction chamber; 402, anhydride injection pipe; 403, first methanol injection pipe; 404, double esterification reaction chamber; 405, acid catalyst injection pipe; 406, second methanol injection pipe; 407, finished product discharge pipe; 408, second electric valve. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] The utility model is further described below in conjunction with the accompanying drawings:

[0030] like Figure 1-Figure 7As shown, a dimethyl maleate synthesis reaction device comprises a supporting mechanism, the supporting mechanism comprises a partition plate 101, a fixing tube 102 is welded on the partition plate 101, a synthesis reaction mechanism is arranged on the partition plate 101, the synthesis reaction mechanism comprises a monoesterification reaction chamber 401 arranged above the partition plate 101, a diesterification reaction chamber 404 is arranged below the partition plate 101, the monoesterification reaction chamber 401 and the diesterification reaction chamber 404 are symmetrically arranged, a heating mechanism is arranged outside the monoesterification reaction chamber 401 and the diesterification reaction chamber 404, the heating mechanism comprises a jacket shell 201 fixedly connected to the upper and lower sides of the partition plate 101 by bolts and symmetrically arranged, a gap is formed between the jacket shell 201 and the outer sides of the monoesterification reaction chamber 401 and the diesterification reaction chamber 404, and a plurality of symmetrically arranged heating mechanisms are welded and fixedly connected to the upper and lower sides of the partition plate 101. A support block 103 is provided, a fixed plate 204 is fixedly connected to the outside of the support block 103, a gap is formed between the fixed plate 204 and the partition plate 101, a heat-conducting pillar 203 is welded and fixedly connected to the outside of the fixed plate 204, a gap is formed between the heat-conducting pillar 203 and the fixed tube 102, two heat medium connecting pipes 202 are welded on the upper and lower sides of one side of the jacket shell 201, the heat medium connecting pipe 202 is externally connected to a heat medium source, the heat medium source can fill the above-mentioned gap and transfer heat to the monoesterification reaction chamber 401 or the double esterification reaction chamber 404, a stirring mechanism is provided on the two heat-conducting pillars 203, the heat medium enters the gap from the heat medium connecting pipe 202 on one side, the heat medium distributes the heat to the monoesterification reaction chamber 401 or the double esterification reaction chamber 404 through heat conduction, and then the heat medium leaves the reaction device from the other heat medium connecting pipe 202.

[0031] A first electric valve 104 is fixedly connected to one side of the partition plate 101, and the upper surface of the upper fixed plate 204 is set to be an inclined surface inclined to the first electric valve 104. The setting of the inclined surface facilitates the monomethyl maleate that has completed the reaction on the upper side to flow into the first electric valve 104. The first electric valve 104 connects the monoesterification reaction chamber 401 with the double esterification reaction chamber 404. When the raw materials in the monoesterification reaction chamber 401 complete the monoesterification reaction under heating conditions to generate monomethyl maleate, the first electric valve 104 opens, and the monomethyl maleate on the upper side passes through the first electric valve 104 and enters the double esterification reaction chamber 404.

[0032] The stirring mechanism includes a plurality of connecting rings 303 rotatably connected to the heat-conducting pillar 203, a rotating frame 304 is fixedly connected to one side of the connecting ring 303, a plurality of rotating bevel gears 305 evenly arranged on the circumference are rotatably connected to the other end of the rotating frame 304, a plurality of fixed bevel gears 306 are fixedly connected to the heat-conducting pillar 203, the rotating bevel gears 305 mesh with the fixed bevel gears 306, a stirring blade 307 is fixedly connected to the other end of the rotating bevel gear 305, the other end face of the rotating frame 304 is fixedly connected to another connecting ring 303, a motor 301 is fixedly connected to the top of the monoesterification reaction chamber 401, and a transmission shaft is rotatably connected to the fixed tube 102 in a sealed manner. 302, the output end of the motor 301 is fixedly connected to the transmission shaft 302, the transmission shaft 302 is fixedly connected to the connecting rings 303 at the upper and lower ends, the motor 301 drives the transmission shaft 302 to rotate, the transmission shaft 302 drives the connecting ring 303 to rotate, the connecting ring 303 drives the rotating frame 304 to rotate, the rotating frame 304 drives the rotating bevel gear 305 to revolve around the heat-conducting support 203, the rotating bevel gear 305 cooperates with the fixed bevel gear 306, so that the stirring blade 307 can rotate while the stirring blade 307 is revolving, so that the raw materials can be stirred, the esterification reaction can be carried out more thoroughly, incomplete reaction can be avoided, and the reaction quality is improved.

[0033] An anhydride injection pipe 402 is fixedly connected to one side of the top of the monoesterification reaction chamber 401, and the anhydride injection pipe 402 is externally connected to a maleic anhydride source. A first methanol injection pipe 403 is fixedly connected to the lower end of the monoesterification reaction chamber 401, and the first methanol injection pipe 403 is connected to the interior of the monoesterification reaction chamber 401, and the first methanol injection pipe 403 is externally connected to a methanol vapor source. A finished product discharge pipe 407 is fixedly connected to the bottom of the double esterification reaction chamber 404, and a second electric valve 408 is fixedly connected to the finished product discharge pipe 407. An acid catalyst injection pipe 405 is fixedly connected to one side of the upper end of the double esterification reaction chamber 404, and the acid catalyst injection pipe 405 is connected to the interior of the double esterification reaction chamber 404, and the acid catalyst injection pipe 405 is externally connected to a sulfuric acid source. A second methanol injection pipe 406 is fixedly connected to one side of the lower end of the double esterification reaction chamber 404, and the second methanol injection pipe 406 is connected to the interior of the double esterification reaction chamber 404. Pipe 406 is externally connected to a methanol vapor source. After the monoesterification reaction chamber 401 is preheated by the heating device, maleic anhydride enters the monoesterification reaction chamber 401 from the anhydride injection pipe 402. At the same time, methanol vapor enters the monoesterification reaction chamber 401 from the first methanol injection pipe 403. Under the stirring of the stirring blade 307, maleic anhydride reacts with methanol vapor to produce monomethyl maleate. Subsequently, monomethyl maleate enters the double esterification reaction chamber 404 from the first electric valve 104. Sulfuric acid enters the double esterification reaction chamber 404 from the acid catalyst injection pipe 405. At the same time, methanol vapor enters the double esterification reaction chamber 404 from the second methanol injection pipe 406. Under the action of sulfuric acid as a catalyst, monomethyl maleate fully reacts with methanol vapor to produce dimethyl maleate. Subsequently, the second electric valve 408 is opened, and the generated dimethyl maleate leaves the device from the finished product discharge pipe 407 and enters the distillation tower.

[0034] Working principle: The heat medium enters the gap from the heat medium connecting pipe 202 on one side, and the heat medium distributes the heat to the monoesterification reaction chamber 401 or the double esterification reaction chamber 404 through heat conduction. Then the heat medium leaves the reaction device from the other heat medium connecting pipe 202. After the monoesterification reaction chamber 401 is preheated by the heating device, maleic anhydride enters the monoesterification reaction chamber 401 from the anhydride injection pipe 402. At the same time, methanol vapor enters the monoesterification reaction chamber 401 from the first methanol injection pipe 403. Under the stirring of the stirring blade 307, maleic anhydride reacts with methanol vapor to produce monomethyl maleate. Then, monomethyl maleate enters the double esterification reaction chamber 404 from the first electric valve 104, and sulfuric acid enters the double esterification reaction chamber 404 from the acid catalyst injection pipe 405. At the same time, methanol vapor enters the second methanol injection pipe 403. The injection pipe 406 enters the double esterification reaction chamber 404, and under the action of sulfuric acid as a catalyst, monomethyl maleate and methanol vapor fully react to produce dimethyl maleate, and then the second electric valve 408 is opened, and the generated dimethyl maleate leaves the device from the finished product discharge pipe 407 and enters the distillation tower, and the motor 301 drives the transmission shaft 302 to rotate, and the transmission shaft 302 drives the connecting ring 303 to rotate, and the connecting ring 303 drives the rotating frame 304 to rotate, and the rotating frame 304 drives the rotating bevel gear 305 to revolve around the heat-conducting support 203, and the rotating bevel gear 305 cooperates with the fixed bevel gear 306, so that the stirring blade 307 can rotate while the stirring blade 307 is revolving, so that the raw materials can be stirred to make the esterification reaction more thorough, avoid incomplete reaction, and improve the reaction quality.

[0035] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A dimethyl maleate synthesis reaction device, comprising a supporting mechanism, characterized in that: The supporting mechanism comprises a partition plate (101), to which a fixing tube (102) is fixedly connected, and a synthesis reaction mechanism is arranged on the partition plate (101), wherein the synthesis reaction mechanism comprises a monoesterification reaction chamber (401) arranged above the partition plate (101), and a diesterification reaction chamber (404) is arranged below the partition plate (101), wherein the monoesterification reaction chamber (401) and the diesterification reaction chamber (404) are symmetrically arranged, and a heating mechanism is arranged outside the monoesterification reaction chamber (401) and the diesterification reaction chamber (404), wherein the heating mechanism comprises a jacket shell (201) fixedly connected to the upper and lower sides of the partition plate (101) and symmetrically arranged, and the jacket shell (201) and the monoesterification reaction chamber (404) are symmetrically arranged. A closed gap is formed on the outside of the reaction chamber (401) and the double esterification reaction chamber (404); a plurality of symmetrically arranged support blocks (103) are fixedly connected to the upper and lower sides of the partition plate (101); a fixed plate (204) is fixedly connected to the outside of the support block (103); a gap is formed between the fixed plate (204) and the partition plate (101); a heat-conducting pillar (203) is fixedly connected to the outside of the fixed plate (204); a gap is formed between the heat-conducting pillar (203) and the fixed pipe (102); two upper and lower heat medium connecting pipes (202) are fixedly connected to one side of the jacket shell (201); a heat medium source is externally connected to the heat medium connecting pipe (202); and a stirring mechanism is provided on both of the two heat-conducting pillars (203).

2. A dimethyl maleate synthesis reaction device according to claim 1, characterized in that: A first electric valve (104) is fixedly connected to one side of the partition plate (101), and an upper surface of the upper fixed plate (204) is arranged to be inclined towards the first electric valve (104). The first electric valve (104) connects the monoesterification reaction chamber (401) with the diesterification reaction chamber (404).

3. A dimethyl maleate synthesis reaction device according to claim 1, characterized in that: The stirring mechanism comprises a plurality of connecting rings (303) rotatably connected to the heat-conducting pillars (203); a rotating frame (304) is fixedly connected to one side of the connecting ring (303); a plurality of rotating bevel gears (305) uniformly arranged around the circumference are rotatably connected to the other end of the rotating frame (304); a plurality of fixed bevel gears (306) are fixedly connected to the heat-conducting pillars (203); the rotating bevel gears (305) are meshed with the fixed bevel gears (306); a stirring blade (307) is fixedly connected to the other end of the rotating bevel gear (305); and the other end surface of the rotating frame (304) is fixedly connected to another connecting ring (303).

4. A dimethyl maleate synthesis reaction device according to claim 3, characterized in that: A motor (301) is fixedly connected to the top of the monoesterification reaction chamber (401), a transmission shaft (302) is sealingly and rotatably connected inside the fixed tube (102), an output end of the motor (301) is fixedly connected to the transmission shaft (302), and the transmission shaft (302) is fixedly connected to the connection rings (303) at the upper and lower ends.

5. A dimethyl maleate synthesis reaction device according to claim 1, characterized in that: An anhydride injection pipe (402) is fixedly connected to one side of the top of the monoesterification reaction chamber (401), and the anhydride injection pipe (402) is externally connected to a maleic anhydride source. A first methanol injection pipe (403) is fixedly connected to the lower end of the monoesterification reaction chamber (401), and the first methanol injection pipe (403) is connected to the interior of the monoesterification reaction chamber (401), and the first methanol injection pipe (403) is externally connected to a methanol vapor source.

6. A dimethyl maleate synthesis reaction device according to claim 5, characterized in that: A finished product discharge pipe (407) is fixedly connected to the bottom of the double esterification reaction chamber (404), and a second electric valve (408) is fixedly connected to the finished product discharge pipe (407). An acid catalyst injection pipe (405) is fixedly connected to one side of the upper end of the double esterification reaction chamber (404), and the acid catalyst injection pipe (405) is connected to the inside of the double esterification reaction chamber (404). The acid catalyst injection pipe (405) is externally connected to a sulfuric acid source. A second methanol injection pipe (406) is fixedly connected to one side of the lower end of the double esterification reaction chamber (404), and the second methanol injection pipe (406) is connected to the inside of the double esterification reaction chamber (404). The second methanol injection pipe (406) is externally connected to the methanol vapor source.

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