Vinyl ether synthesis reactor

Abstract

The utility model relates to the technical field of vinyl ether synthesis, and provides a vinyl ether synthesis reactor which comprises a reaction tank, one side of the bottom end of the reaction tank is fixedly connected with a nitrogen inlet pipe, the lower end of one side of the reaction tank is fixedly connected with an acetylene inlet pipe, and the surface of the reaction tank is fixedly connected with a steam sleeve. The top end of the reaction tank is fixedly connected with a gas-liquid separation pipe, the top end of the gas-liquid separation pipe is fixedly connected with a reflux condenser, the top end of the reflux condenser is fixedly connected with a gas-phase discharge pipe, and the reflux condenser, the gas-liquid separation pipe, the reaction tank and the steam jacket are arranged, so that the reaction tank is used for realizing gas-liquid reaction of acetylene and alcohol; the gas-liquid separation pipe is used for separating vinyl ether from alcohol, and the reflux condenser is used for providing reflux feed liquid required by the separation section, so that the reaction condition is mild, the conversion rate and selectivity are high, and the catalyst does not need to be replaced in a short time, and the purposes of economical efficiency and greenization are achieved on the whole.

Description

Technical Field

[0001] The utility model relates to the technical field of vinyl ether synthesis, in particular to a vinyl ether synthesis reactor. The reactor can be used for addition reaction of alcohol with acetylene to generate vinyl ether compounds. Background Art

[0002] Vinyl ether compounds have broad application prospects in printing, inks, electronic materials and other fields. In recent years, their role as active diluents in coatings has attracted much attention and has developed rapidly. Taking vinyl glycol ether as an example, ethylene glycol and acetylene react in the presence of an alkaline catalyst to produce vinyl glycol ether. This is a gas-liquid phase reaction, which is a slow reaction and is mainly caused by the reaction of acetylene and alcohol dissolved in the reaction liquid.

[0003] After searching, the existing patent (Announcement No.: CN209885771U) discloses a baffle-type vinyl ether product reactor, characterized in that the venturi distribution plate divides the reactor into two independent chambers, the acetylene distribution chamber at the bottom and the liquid phase reaction area at the top, and an acetylene rough distributor is arranged in the acetylene distribution chamber; the liquid phase reaction area on the venturi distribution plate is provided with multiple vertical baffles, which divide the liquid phase reaction area into multiple ascending areas and descending areas to form a local circulation; only the venturi nozzle is installed in the ascending area divided by the baffle, and a fresh ethylene glycol distributor is arranged at the bottom of each descending area. This new gas-liquid phase reactor greatly improves the gas-liquid phase reaction rate and the conversion rate of the reaction. The reactor operates continuously and stably with large output, and can increase the product capacity from hundreds of tons per year to tens of thousands of tons, which has a breakthrough significance for the large-scale industrial biochemical continuous production of vinyl ether products.

[0004] However, in the above scheme, under the action of potassium alcohol, a large number of side reactions occur at the same time. As the by-products increase, the reaction liquid gradually becomes viscous, and eventually the catalyst activity decreases. The catalyst needs to be replaced before the reaction can be carried out. This leads to the need for frequent replacement of the catalyst, which in turn reduces the production efficiency of vinyl glycol ether and increases the corresponding production cost.

[0005] In view of this, the utility model provides a vinyl ether synthesis reactor. Utility Model Content

[0006] The utility model provides a vinyl ether synthesis reactor, which solves the problems in the related technology that the process is relatively complicated, the conversion rate and selectivity are low, and the catalyst needs to be replaced frequently.

[0007] The technical scheme of the utility model is as follows: a vinyl ether synthesis reactor comprises a reaction tank, the bottom end of the reaction tank is fixedly connected with a support leg at an equal angle, one side of the bottom end of the reaction tank is fixedly connected with a nitrogen inlet pipe, the middle position of the bottom end of the reaction tank is fixedly connected with a discharge pipe, the lower end of one side of the reaction tank is fixedly connected with an acetylene inlet pipe, the lower end of the other side of the reaction tank is fixedly connected with a n-butanol solution inlet pipe, the side of the reaction tank above the n-butanol solution inlet pipe is fixedly connected with an alcohol liquid inlet pipe, the inner wall of the reaction tank is fixedly connected with a catalyst partition at equal intervals, the surface of the reaction tank is fixedly connected with a steam jacket, the upper end of one side of the steam jacket is fixedly connected with a steam exhaust pipe, the lower end of the other side of the steam jacket is fixedly connected with a steam inlet pipe, the top end of the reaction tank is fixedly connected with a gas-liquid separation pipe, the top end of the gas-liquid separation pipe is fixedly connected with a reflux condenser, the top end of the reflux condenser is fixedly connected with a gas phase discharge pipe, and the upper end of the gas-liquid separation pipe and the inner wall of the reaction tank are provided with a sealing component.

[0008] Preferably, baffles are cross-fixedly connected to the inner wall of the steam jacket at equal intervals, and through holes are formed at equal angles at the top ends of the baffles.

[0009] Preferably, the inclination angle of the top end of the baffle plate to the horizontal direction is thirty degrees, and the shape of the baffle plate in a top view is an arc.

[0010] Preferably, the bottom end of the reaction tank is bowl-shaped, and the bottom end of the reaction tank and the top ends of the legs are welded into an integrated structure.

[0011] Preferably, the sealing assembly includes a connecting sleeve, which is fixedly connected to the upper ends of the gas-liquid separation tube and the inner wall of the reaction tank, a sealing ring is fixedly connected to the lower end of the surface of the connecting sleeve, and an elastic sheet is fixedly connected to the upper end of the surface of the connecting sleeve at an equal angle.

[0012] Preferably, the lower end of the inner wall of the connecting sleeve is in an inverted funnel shape, and the outer wall of the connecting sleeve and the upper ends of the gas-liquid separation tube and the inner wall of the reaction tank are welded into an integrated structure.

[0013] Preferably, the surface of the sealing ring is wavy, and the shape of the sealing ring in a top view is O-shaped.

[0014] Preferably, the cross-section of the elastic sheet is L-shaped, and the elastic sheet is welded at equal angles to the upper end of the surface of the connecting sleeve.

[0015] Preferably, the surface of the elastic sheet is provided with anti-skid grooves at equal intervals, and the cross-section of the anti-skid grooves is in the shape of an inverted isosceles trapezoid.

[0016] Preferably, anti-slip grooves are provided at equal angles on the bottom ends of the supporting legs, and the anti-slip grooves are wavy in shape when viewed from above.

[0017] The working principle and beneficial effects of the utility model are:

[0018] 1. The utility model provides a reflux condenser, a gas-liquid separation tube, a reaction tank, a steam jacket, an acetylene inlet tube, a nitrogen inlet tube, a n-butanol solution inlet tube, an alcohol liquid inlet tube and a catalyst partition, and utilizes an alkali metal or alkaline earth metal oxide catalyst on the catalyst partition to carry out a catalytic reaction, so that the reaction tank is used to realize a gas-liquid reaction of acetylene and alcohol, and then utilizes a gas-liquid separation tube to realize the separation of vinyl ether and alcohol, and then utilizes a reflux condenser to provide the reflux feed liquid required for the separation section, and utilizes a steam jacket to control the temperature inside the reaction tank, so that the reaction conditions are mild, the conversion rate and selectivity are high, and there is no need to replace the catalyst in a short period of time, so that the overall economic and green purposes are achieved, and its practicality is improved;

[0019] 2. According to the sealing assembly provided in the utility model, when the reflux condenser or the gas-liquid separation tube is installed, the connecting sleeve will be clamped to one end of the reflux condenser or the gas-liquid separation tube, and the elastic elastic sheet will be used to improve the initial clamping firmness between the reflux condenser and the gas-liquid separation tube or the gas-liquid separation tube and the reaction tank, and then the bolts are used to lock and fix the flange, and then the sealing ring is used to improve the sealing after the clamping installation to avoid leakage, thereby facilitating the smooth progress of the vinyl ether synthesis operation and improving its practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the steam jacket of the utility model;

[0024] Figure 4 It is a schematic diagram of the exploded enlarged structure of the cross section of the reaction tank mouth of the utility model;

[0025] Figure 5 For the utility model Figure 4 Enlarged structural diagram at A in the middle.

[0026] In the figure: 1. reflux condenser; 2. gas-liquid separation tube; 3. reaction tank; 4. steam exhaust pipe; 5. steam jacket; 6. acetylene inlet pipe; 7. nitrogen inlet pipe; 8. support leg; 9. discharge pipe; 10. n-butanol solution inlet pipe; 11. alcohol solution inlet pipe; 12. steam inlet pipe; 13. gas phase discharge pipe; 14. sealing assembly; 1401. connecting sleeve; 1402. sealing ring; 1403. anti-skid groove; 1404. elastic sheet; 15. catalyst separator; 16. anti-skid pattern; 17. baffle; 18. through hole. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0028] Example 1

[0029] The preferred embodiment of the vinyl ether synthesis reactor provided by the utility model is as follows Figures 1 to 5 As shown: a vinyl ether synthesis reactor, comprising a reaction tank 3, the bottom of the reaction tank 3 is fixedly connected with a support leg 8 at an equal angle, one side of the bottom of the reaction tank 3 is fixedly connected with a nitrogen inlet pipe 7, the middle position of the bottom of the reaction tank 3 is fixedly connected with a discharge pipe 9, the lower end of one side of the reaction tank 3 is fixedly connected with an acetylene inlet pipe 6, the lower end of the other side of the reaction tank 3 is fixedly connected with a n-butanol solution inlet pipe 10, the side of the reaction tank 3 above the n-butanol solution inlet pipe 10 is fixedly connected with an alcohol solution inlet pipe 11, the inner part of the reaction tank 3 Catalyst partitions 15 are fixedly connected to the wall at equal intervals, a steam jacket 5 is fixedly connected to the surface of the reaction tank 3, an upper end of one side of the steam jacket 5 is fixedly connected to a steam exhaust pipe 4, and a lower end of the other side of the steam jacket 5 is fixedly connected to a steam inlet pipe 12, a gas-liquid separation pipe 2 is fixedly connected to the top of the reaction tank 3, a reflux condenser 1 is fixedly connected to the top of the reflux condenser 1, a gas phase discharge pipe 13 is fixedly connected to the top of the reflux condenser 1, and a sealing assembly 14 is provided at the upper end of the gas-liquid separation pipe 2 and the inner wall of the reaction tank 3.

[0030] In this embodiment, the inner wall of the steam jacket 5 is cross-fixed with baffles 17 at equal intervals, and through holes 18 are opened at equal angles at the top of the baffles 17. The cross-distributed baffles 17 are used to slow down the flow rate of steam inside the steam jacket 5, extend the contact heat exchange time between the steam and the surface of the reaction tank 3, and facilitate heating the inside of the reaction tank 3.

[0031] In this embodiment, the inclination angle between the top end of the baffle plate 17 and the horizontal direction is thirty degrees, and the shape of the baffle plate 17 in a top view is an arc. The inclined baffle plate 17 is used to further reduce the steam flow rate.

[0032] In this embodiment, the bottom end of the reaction tank 3 is bowl-shaped, and the bottom end of the reaction tank 3 and the top end of the support leg 8 are welded into an integrated structure. The bowl-shaped reaction tank 3 is used to facilitate the discharge of waste catalyst liquid.

[0033] Example 2

[0034] Based on Example 1, a preferred embodiment of the vinyl ether synthesis reactor provided by the utility model is as follows Figures 1 to 5 As shown: the sealing component 14 includes a connecting sleeve 1401, which is fixedly connected to the upper ends of the inner walls of the gas-liquid separation tube 2 and the reaction tank 3, and a sealing ring 1402 is fixedly connected to the lower end of the surface of the connecting sleeve 1401, and an elastic sheet 1404 is fixedly connected to the upper end of the surface of the connecting sleeve 1401 at an equal angle. The elastic elastic sheet 1404 is used to improve the initial clamping firmness between the reflux condenser 1 and the gas-liquid separation tube 2 or the gas-liquid separation tube 2 and the reaction tank 3, and the sealing ring 1402 is used to improve the sealing after the clamping installation to avoid leakage.

[0035] In this embodiment, the lower end of the inner wall of the connecting sleeve 1401 is in an inverted funnel shape, and the outer wall of the connecting sleeve 1401 and the upper ends of the inner walls of the gas-liquid separation tube 2 and the reaction tank 3 are welded into an integrated structure. The connecting sleeve 1401 with an inverted funnel shape at the lower end is used to facilitate the drainage of materials.

[0036] In this embodiment, the surface of the sealing ring 1402 is wavy, and the shape of the sealing ring 1402 in the top view is O-shaped. The O-shaped sealing ring 1402 is used to improve the sealing performance of the clamping installation between the reflux condenser 1 and the gas-liquid separation tube 2 or the gas-liquid separation tube 2 and the reaction tank 3.

[0037] In this embodiment, the cross-section of the elastic sheet 1404 is L-shaped, and the elastic sheet 1404 is welded at equal angles to the upper end of the surface of the connecting sleeve 1401. The L-shaped elastic sheet 1404 is easier to deform and be clamped and fixed to the inner wall of the reflux condenser 1 or the gas-liquid separation tube 2.

[0038] In this embodiment, anti-skid grooves 1403 are evenly spaced on the surface of the elastic sheet 1404, and the cross-section of the anti-skid grooves 1403 is an inverted isosceles trapezoid. The inverted isosceles trapezoidal anti-skid grooves 1403 are used to further improve the frictional tightness between the outer wall of the connecting sleeve 1401 and the inner wall of the reflux condenser 1 or the gas-liquid separation tube 2.

[0039] In addition, the bottom end of the leg 8 is provided with anti-skid grooves 16 at equal angles. The anti-skid grooves 16 are wavy in shape when viewed from above. The wavy anti-skid grooves 16 are used to improve the anti-skid properties of the contact between the bottom end of the leg 8 and the mounting surface.

[0040] The working principle and use process of the utility model are as follows: first, when installing the reflux condenser 1 or the gas-liquid separation tube 2, the connecting sleeve 1401 will be clamped to one end of the reflux condenser 1 or the gas-liquid separation tube 2, and the elastic elastic sheet 1404 is used to improve the initial clamping firmness between the reflux condenser 1 and the gas-liquid separation tube 2 or the gas-liquid separation tube 2 and the reaction tank 3, and then the bolts are used to lock and fix the flange, and then the sealing ring 1402 is used to improve the sealing after the clamping installation to avoid leakage;

[0041] Then, a 20% concentration of potassium n-butoxide n-butanol solution is pumped into the reaction tank 3 through the n-butanol solution inlet pipe 10 to the specified liquid level, and then replaced with nitrogen three times through the nitrogen inlet pipe 7. At the same time, the cooling circulating water at the top of the reflux condenser 1 is turned on. Then, steam is transported to the steam jacket 5 through the steam inlet pipe 12, and the inclined and crossed baffles 17 are used to slow down the steam flow rate and prolong the contact heat exchange time with the reaction tank 3, so that the temperature in the reaction tank 3 can be raised to 110°C and maintained. The alcohol inlet pump is turned on and the alcohol solution is cooled through the alcohol inlet pipe 1. 1. Maintain the alcohol inlet flow rate at 30-50 L / h, open the acetylene inlet valve at the same time, and maintain the acetylene flow rate at 30-40 Nm³ / h using the acetylene inlet pipe 6. As the reaction proceeds, the tower top temperature gradually increases. Adjust the circulating water flow rate to control the tower top temperature at 80-90°C, and adjust the alcohol inlet flow rate to control the liquid level of the synthesis tower between the upper and lower sight glasses. Then gradually increase the acetylene flow rate to 70 Nm³ / h to achieve smooth vinyl ether synthesis reaction. Then the crude vinyl ether is discharged from the gas phase discharge pipe 13.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vinyl ether synthesis reactor, comprising a reaction tank (3), characterized in that: The bottom end of the reaction tank (3) is fixedly connected to a support leg (8) at an equal angle, one side of the bottom end of the reaction tank (3) is fixedly connected to a nitrogen inlet pipe (7), a middle position of the bottom end of the reaction tank (3) is fixedly connected to a discharge pipe (9), the lower end of one side of the reaction tank (3) is fixedly connected to an acetylene inlet pipe (6), the lower end of the other side of the reaction tank (3) is fixedly connected to an n-butanol solution inlet pipe (10), the side of the reaction tank (3) above the n-butanol solution inlet pipe (10) is fixedly connected to an alcohol solution inlet pipe (11), and the inner wall of the reaction tank (3) is fixedly connected to catalyst spacers (12) at equal intervals. The reaction tank (3) is provided with a plate (15), a steam jacket (5) is fixedly connected to the surface of the reaction tank (3), an upper end of one side of the steam jacket (5) is fixedly connected to a steam exhaust pipe (4), a lower end of the other side of the steam jacket (5) is fixedly connected to a steam inlet pipe (12), a top end of the reaction tank (3) is fixedly connected to a gas-liquid separation pipe (2), a top end of the gas-liquid separation pipe (2) is fixedly connected to a reflux condenser (1), a top end of the reflux condenser (1) is fixedly connected to a gas phase discharge pipe (13), and a sealing assembly (14) is provided at the upper end of the gas-liquid separation pipe (2) and the inner wall of the reaction tank (3).

2. A vinyl ether synthesis reactor according to claim 1, characterized in that: Baffles (17) are cross-fixedly connected to the inner wall of the steam jacket (5) at equal intervals, and through holes (18) are formed at equal angles at the top ends of the baffles (17).

3. A vinyl ether synthesis reactor according to claim 2, characterized in that: The inclination angle of the top end of the baffle plate (17) to the horizontal direction is thirty degrees, and the shape of the baffle plate (17) in a top view is an arc.

4. A vinyl ether synthesis reactor according to claim 1, characterized in that: The bottom end of the reaction tank (3) is bowl-shaped, and the bottom end of the reaction tank (3) and the top end of the support leg (8) are welded into an integrated structure.

5. A vinyl ether synthesis reactor according to claim 1, characterized in that: The sealing assembly (14) comprises a connecting sleeve (1401), wherein the connecting sleeve (1401) is fixedly connected to the upper ends of the inner wall of the gas-liquid separation tube (2) and the reaction tank (3), a sealing ring (1402) is fixedly connected to the lower end of the surface of the connecting sleeve (1401), and an elastic sheet (1404) is fixedly connected to the upper end of the surface of the connecting sleeve (1401) at an equal angle.

6. A vinyl ether synthesis reactor according to claim 5, characterized in that: The lower end of the inner wall of the connecting sleeve (1401) is in an inverted funnel shape, and the outer wall of the connecting sleeve (1401) and the upper ends of the inner walls of the gas-liquid separation tube (2) and the reaction tank (3) are welded into an integrated structure.

7. A vinyl ether synthesis reactor according to claim 5, characterized in that: The surface of the sealing ring (1402) is wavy, and the shape of the sealing ring (1402) in a top view is O-shaped.

8. A vinyl ether synthesis reactor according to claim 5, characterized in that: The cross-section of the elastic sheet (1404) is L-shaped, and the elastic sheet (1404) is welded at equal angles to the upper end of the surface of the connecting sleeve (1401).

9. A vinyl ether synthesis reactor according to claim 5, characterized in that: The surface of the elastic sheet (1404) is provided with anti-skid grooves (1403) at equal intervals, and the cross-section of the anti-skid grooves (1403) is in the shape of an inverted isosceles trapezoid.

10. A vinyl ether synthesis reactor according to claim 1, characterized in that: The bottom ends of the supporting legs (8) are provided with anti-skid patterns (16) at equal angles, and the anti-skid patterns (16) are wavy in shape when viewed from above.

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