Carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas

Abstract

The utility model discloses a carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas, which comprises a conical material receiving pipe as well as a heat tracing outer pipe and a material discharging straight pipe which are sequentially and fixedly connected with the bottom end of the conical material receiving pipe through flanges in a bolting manner, and flange plates are mounted at the ends, far away from each other, of the conical material receiving pipe and the material discharging straight pipe; and an inner heat tracing barrel with an electric heating unit is arranged in the heat tracing outer pipe, a hollow shell is fixed to the top end of the inner heat tracing barrel, a hollow disc shell is integrally formed in the center of the interior of the hollow shell, and a plurality of material guiding pipes used for communicating the inner heat tracing barrel with the conical material receiving pipe are installed in the hollow disc shell. The rotation of the auger roller can disturb the flow of a material medium, promote the material medium to be mixed more uniformly, prevent the local temperature of the material medium from being too high or too low, and increase the contact area of the material medium and the inner heat tracing cylinder, so that the heat exchange is more sufficient, and the heat exchange effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ethylene glycol synthesis equipment, in particular to a carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas. Background Art

[0002] The carbonylation reaction unit for industrial synthesis gas to produce ethylene glycol is a key equipment in the chemical industry, mainly used to convert carbon monoxide and hydrogen in the synthesis gas into ethylene glycol. Its structure includes a reactor, a catalyst packing layer, a feeding system, a reaction control system and a product separation system. The reactor is usually made of high temperature and pressure resistant materials, and may be coated with an anti-corrosion coating inside. The catalyst is a key component, and commonly used ones include zinc oxide, zinc chromium catalysts, etc., which are loaded on a carrier with a high surface area. The packing layer usually uses spherical packing or annular packing to increase the reaction surface area. The feeding system ensures the accurate supply of synthesis gas, while the reaction control system maintains stable reaction conditions;

[0003] For example, a carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas disclosed in the authorization announcement number CN206345812U includes a reactor, an inlet pipeline and an outlet pipeline. A plurality of tubes filled with catalysts are arranged longitudinally inside the reactor; a circulating water pipe is connected to the reactor shell, the water inlet of the circulating water pipe is located at the lower part of the reactor shell and the water outlet is located at the upper part of the reactor shell, and a high-pressure drum controller and a forced circulation pump are arranged in sequence between the water inlet and the water outlet of the circulating water pipe; an imported online analyzer, an imported regulating valve, an emergency shut-off device, an inert gas protection device, and an air filter are arranged in sequence on the inlet pipeline. The outlet pipeline is provided with an outlet heating system, which is used to compensate for the loss of the medium in the pipe externally to maintain the temperature of the medium being transported. However, in the technical solution, the material medium in the outlet pipeline flows too fast, and the material medium is often discharged without sufficient heat exchange and temperature increase with the outlet pipeline, which will cause some materials to fail to reach the expected reaction temperature, and the temperature drop will reduce the solubility in the reaction materials, thereby causing some substances insoluble in the reaction medium (such as dimethyl oxalate) to precipitate and crystallize. This will cause the reactor pipeline to be blocked, affecting the continuous reaction and the normal operation of the equipment. Utility Model Content

[0004] The purpose of the utility model is to provide a carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas, wherein an inner heating cylinder that can be electrically heated is arranged inside a heating outer tube, and a hollow disk shell is installed on the top of the inner heating cylinder, and a gear drive assembly that can drive an auger roller to rotate is arranged inside the hollow disk shell. In this process, the auger roller is used to block and disturb the flow of the material medium, thereby increasing the contact area and duration between the material medium and the inner heating cylinder, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas, comprising a conical material receiving pipe and a heating outer pipe and a discharge straight pipe whose bottom ends are flange-bolted and fixed in sequence, the conical material receiving pipe and the discharge straight pipe are both equipped with flanges at their ends away from each other, an inner heating cylinder with an electric heating unit is arranged inside the heating outer pipe, a hollow shell is fixed at the top end of the inner heating cylinder, and a hollow disk shell is integrally formed at the center position of the hollow shell, a plurality of material guide pipes for connecting the inner heating cylinder and the conical material receiving pipe are installed inside the hollow disk shell, a hollow disk is fixed at one end inside the inner heating cylinder, and an auger roller is rotatably installed at the center position of the bottom end of the hollow disk, and a gear drive assembly for driving the auger roller to rotate is arranged inside the hollow disk shell.

[0006] Preferably, the electric heating unit is four heating tubes installed at equal intervals on the top wall of the inner heating cylinder.

[0007] Preferably, a liquid discharge pipe and a liquid inlet pipe with a height difference are installed on the outer walls of both sides of the outer heating tube, and one end of the liquid discharge pipe and the liquid inlet pipe extends into the hollow cavity of the inner heating tube.

[0008] Preferably, an auxiliary material passing pipe is fixed to one end of the inner part of the discharge straight pipe, and both ends of the auxiliary material passing pipe pass through to the outside of the discharge straight pipe.

[0009] Preferably, the gear drive assembly includes a secondary gear plate fixed to the top of the auger roller, and a driven shaft rotatably mounted at the bottom edge of the hollow disk shell, a gear ring rotatably mounted at the bottom of the hollow disk shell, and an upper gear and a lower gear for meshing with the gear ring and the secondary gear plate are respectively mounted at both ends of the driven shaft.

[0010] Preferably, the gear drive assembly further comprises a stepper motor mounted on one side of the bottom of the hollow shell, and a driving gear mounted on the output end of the stepper motor for driving the gear ring to rotate.

[0011] Preferably, both sides of the surface of the secondary gear disc are provided with hollow grooves that completely penetrate the secondary gear disc.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas is provided with a gear drive assembly and an auger roller and other structures that cooperate with each other. The rotation of the auger roller can disturb the flow of the material medium, promote its more uniform mixing, and prevent the local temperature of the material medium from being too high or too low. At the same time, it can increase the contact area between the material medium and the internal heating cylinder, make the heat exchange more sufficient, and improve the heat exchange effect. By improving the heat exchange and heating efficiency and promoting the mixing of the reaction materials, the stability and uniformity of the reaction temperature can be guaranteed, and the synthesis efficiency of ethylene glycol and the product quality can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0014] Figure 2 The three-dimensional cross-sectional structure of the utility model is shown in FIG. Figure 1 ;

[0015] Figure 3 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0016] Figure 4 The three-dimensional cross-sectional structure of the utility model is shown in FIG. Figure 2 ;

[0017] Figure 5 For this utility model Figure 4 The enlarged structural diagram at A in the middle;

[0018] Figure 6 It is a schematic diagram of the three-dimensional structure of the secondary gear disc of the utility model;

[0019] In the figure: 1. conical material receiving pipe; 2. outer heating pipe; 3. discharge straight pipe; 301. auxiliary material passing pipe; 4. flange; 5. inner heating cylinder; 6. discharge pipe; 7. liquid inlet pipe; 8. hollow shell; 9. heating pipe; 10. hollow disk shell; 11. material guide pipe; 12. hollow disk; 13. auger roller; 14. hollow groove; 15. gear drive assembly; 1501. driven shaft; 1502. lower gear; 1503. secondary gear disk; 1504. upper gear; 1505. gear ring; 1506. stepping motor; 1507. driving gear. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-6 The utility model provides an embodiment: a carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas, comprising a conical receiving pipe 1, a heat tracing outer pipe 2 and a discharge straight pipe 3, the bottom end of which is fixed by flange bolts in sequence, a secondary material passing pipe 301 is fixed at one end inside the discharge straight pipe 3, and both ends of the secondary material passing pipe 301 penetrate to the outside of the discharge straight pipe 3;

[0022] A flange 4 is installed at one end of the tapered material receiving pipe 1 and the discharge straight pipe 3 that are away from each other. An inner heating tube 5 with an electric heating unit is arranged inside the heating outer pipe 2. A hollow shell 8 is fixed to the top of the inner heating tube 5, and a hollow disk shell 10 is integrally formed at the center position inside the hollow shell 8. Several material guide pipes 11 for connecting the inner heating tube 5 and the tapered material receiving pipe 1 are installed inside the hollow disk shell 10. A hollow disk 12 is fixed at one end inside the inner heating tube 5, and an auger roller 13 is rotatably installed at the center position of the bottom end of the hollow disk 12. A gear drive assembly 15 for driving the auger roller 13 to rotate is arranged inside the hollow disk shell 10. Under the disturbing action of the gear drive assembly 15 and the auger roller 13, the crystallization problem of dimethyl oxalate and other substances when the temperature drops can be effectively avoided, and the reactor is kept unobstructed;

[0023] During the material flow process, the material guide pipe 11 ensures the flow of the material medium in the hollow disk shell 10, avoids the material from being blocked or stagnant, and guides the material medium to flow along a specified flow path, forming an effective flow area with the inner wall of the hollow disk shell 10;

[0024] The electric heating unit is four heating tubes 9 installed at equal intervals on the top wall of the inner heating tube 5. The heating tubes 9 are turned on in advance. The heating tubes 9 can quickly heat up the inner heating tube 5 by electric heating, thereby fully exchanging heat with the internal material medium.

[0025] A liquid discharge pipe 6 and a liquid inlet pipe 7 with a height difference are installed on the outer walls of both sides of the heating outer tube 2. One end of the liquid discharge pipe 6 and the liquid inlet pipe 7 extends into the hollow cavity of the inner heating tube 5. When the inner heating tube 5 needs to be cooled, the staff can connect the liquid inlet pipe 7 and the liquid discharge pipe 6 to the coolant pumping end and the coolant recovery end respectively, so that the coolant enters the inner heating tube 5 through the liquid inlet pipe 7, and the coolant after heat exchange is discharged through the liquid discharge pipe 6, so as to achieve the purpose of quickly reducing the temperature of the heating outer tube 2 and the inner heating tube 5;

[0026] The gear drive assembly 15 includes a secondary toothed disc 1503 fixed on the top of the auger roller 13, and a driven shaft 1501 rotatably mounted at the bottom edge of the hollow disk shell 10. Both sides of the surface of the secondary toothed disc 1503 are provided with hollow grooves 14 that completely penetrate the secondary toothed disc 1503. A gear ring 1505 is rotatably mounted at the bottom of the hollow disk shell 10. An upper gear 1504 and a lower gear 1502 that mesh with the gear ring 1505 and the secondary toothed disc 1503 are respectively mounted at both ends of the driven shaft 1501. The gear drive assembly 15 also includes a stepper motor 1506 mounted on one side of the bottom of the hollow shell 8, and a driving gear 1507 mounted at the output end of the stepper motor 1506 for driving the gear ring 1505 to rotate.

[0027] When the gear drive assembly 15 is working, the stepper motor 1506 drives the driving gear 1507, the gear ring 1505 and the upper gear 1504 to rotate in turn, and then the upper gear 1504, the lower gear 1502 and the driven shaft 1501 rotate together. Since the lower gear 1502 and the secondary gear plate 1503 are meshed with each other, the power of the stepper motor 1506 can eventually be transmitted to the auger roller 13. The structural design of the gear drive assembly 15 will not hinder the circulation of the material medium, and can maintain good contact between the medium and the inner heating cylinder 5, and avoid the material medium from flowing into the hollow shell 8 due to the setting of the power components; the hollow groove 14 and the hollow plate 12 can provide normal circulation for the material medium.

[0028] When the embodiment of the present application is used, the staff first connects the top end of the tapered material receiving pipe 1 to the discharge port of the reactor for preparing ethylene glycol through the flange 4. At this time, the material prepared by the reactor enters the outer heating pipe 2 through the tapered material receiving pipe 1. In this process, the material medium successively passes through the hollow shell 8 and the material guide pipe 11 to enter the inner heating cylinder 5. The several material guide pipes 11 in the hollow shell 10 serve to divert and guide the material into the inner heating cylinder 5. Prior to this, the staff pre-opens the heating pipe 9 and the gear drive assembly 15. The heating pipe 9 can cause the inner heating cylinder 5 to heat up quickly by electric heating, thereby fully exchanging heat with the internal material medium, so that the material medium After reaching the desired expected temperature for use in the next reaction process, the material medium after heating and tracing will enter the next reaction process through the discharge straight pipe 3. In the process of the material medium flowing from top to bottom, the rotational power of the gear drive assembly 15 is transmitted to the auger roller 13. The rotation of the auger roller 13 can disturb the flow of the material medium, promote its more uniform mixing, and prevent the local temperature of the material medium from being too high or too low. At the same time, it can increase the contact area between the material medium and the internal heating cylinder 5, make the heat exchange more sufficient, and improve the heat exchange effect. By improving the heat exchange and heating efficiency and promoting the mixing of the reaction materials, the stability and uniformity of the reaction temperature can be guaranteed, and the synthesis efficiency of ethylene glycol and the product quality can be improved.

Claims

1. A carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas, characterized in that: The invention comprises a conical material receiving pipe (1), a heating outer pipe (2) and a discharge straight pipe (3) which are fixed to the bottom of the conical material receiving pipe (1) by flange bolts in sequence, the conical material receiving pipe (1) and the discharge straight pipe (3) are both provided with flanges (4) at their ends away from each other, an inner heating tube (5) with an electric heating unit is arranged inside the heating outer pipe (2), a hollow shell (8) is fixed at the top end of the inner heating tube (5), and a central position inside the hollow shell (8) is integrally formed. The invention discloses a hollow disk shell (10), wherein a plurality of material guide pipes (11) for connecting an inner heating tube (5) and a conical material receiving pipe (1) are installed inside the hollow disk shell (10), a hollow disk (12) is fixed at one end inside the inner heating tube (5), and an auger roller (13) is rotatably installed at the center position of the bottom end of the hollow disk (12), and a gear driving assembly (15) for driving the auger roller (13) to rotate is arranged inside the hollow disk shell (10).

2. The carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas according to claim 1, characterized in that: The electric heating unit is four heating tubes (9) installed at equal intervals on the top wall of the inner heating cylinder (5).

3. The carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas according to claim 1, characterized in that: A liquid discharge pipe (6) and a liquid inlet pipe (7) with a height difference are installed on the outer walls of both sides of the heating outer tube (2), and one end of the liquid discharge pipe (6) and the liquid inlet pipe (7) extends into the hollow cavity of the inner heating tube (5).

4. The carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas according to claim 1, characterized in that: An auxiliary material passing pipe (301) is fixed to one end of the interior of the straight material discharge pipe (3), and both ends of the auxiliary material passing pipe (301) penetrate to the exterior of the straight material discharge pipe (3).

5. The carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas according to claim 1, characterized in that: The gear drive assembly (15) comprises a secondary toothed disc (1503) fixed to the top of the auger roller (13), and a driven shaft (1501) rotatably mounted at the bottom edge of the hollow disc shell (10), a gear ring (1505) rotatably mounted at the bottom of the hollow disc shell (10), and an upper gear (1504) and a lower gear (1502) for meshing with the gear ring (1505) and the secondary toothed disc (1503) are respectively mounted at both ends of the driven shaft (1501).

6. The carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas according to claim 5, characterized in that: The gear drive assembly (15) further comprises a stepper motor (1506) mounted on one side of the bottom of the hollow shell (8), and a driving gear (1507) mounted on the output end of the stepper motor (1506) for driving the gear ring (1505) to rotate.

7. The carbonylation reaction device for preparing ethylene glycol from industrial synthesis gas according to claim 5, characterized in that: Both sides of the surface of the secondary toothed disc (1503) are provided with hollow grooves (14) that completely penetrate the secondary toothed disc (1503).

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