Methanol alkali solution preheating device for sodium methoxide production

Abstract

The utility model discloses a methanol alkali solution preheating device for sodium methoxide production, which comprises an evaporator, an evaporation tank is arranged at the upper part of the evaporator, an evaporation preheating sleeve is arranged on one side of the evaporation tank, an exhaust condensation pipe is arranged on one side of the evaporation preheating sleeve on the evaporation tank, and the exhaust condensation pipe is communicated with the evaporation preheating sleeve. The exhaust condensation pipe is connected to the evaporation preheating sleeve; the utility model relates to the technical field of sodium methoxide production, in particular to a methanol alkali solution preheating device for sodium methoxide production, which is used for preheating a methanol alkali solution before evaporation and preheating the methanol alkali solution by utilizing the heat of separated steam of an evaporator, an integrated evaporation sleeve is adopted as a preheating structure and is connected with a pipeline for separating the steam through a flange, and the evaporation sleeve is connected with a pipeline for separating the steam. Meanwhile, the valve is used for control, the structure is simple, preheating control is convenient, and the heat utilization rate and the reaction efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium methoxide production, in particular to a methanol alkaline solution preheating device for sodium methoxide production. Background Art

[0002] In the production process of sodium methoxide, alkaline production is a commonly used method for producing sodium methoxide. At present, sodium methoxide is prepared by alkaline method. Alkaline sodium methoxide is obtained by the reaction of methanol and sodium hydroxide. The reaction formula is as follows: CH30H + NaOH --CH3ONa + H20. First, methanol alkaline solution must be prepared. Solid sodium hydroxide is crushed and added to the alkali pot filled with methanol (99.8%) in proportion. The liquid alkali circulation pump is started, and the temperature is controlled below 70°C to dissolve the sodium hydroxide. When the content reaches 20%-23%, it is cooled to 40°C, precipitated, and allowed to stand for 12 hours. Then, the methanol alkaline solution is used to prepare sodium methoxide. The methanol alkaline solution needs to be added to a vaporizer at least 80-100°C. However, since the methanol alkaline solution is already at a lower temperature after standing, after being added to the vaporizer, not only the feed efficiency needs to be controlled, but also the heat of the vaporizer needs to be absorbed. Not only is the heat utilization rate low, but also the efficiency of the reaction preparation is reduced. In view of this, in-depth research was conducted on the above-mentioned issues, and this case was produced. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a methanol alkaline solution preheating device for sodium methoxide production, which solves the problems of the prior art.

[0004] To achieve the above purpose, the utility model is implemented by the following technical scheme: a methanol alkaline solution preheating device for sodium methoxide production, comprising an evaporator, the upper part of the evaporator is an evaporation tank, one side of the evaporation tank is provided with an evaporation preheating sleeve, the evaporation tank is provided with an exhaust condenser on one side of the evaporation preheating sleeve, and the exhaust condenser is connected to the evaporation preheating sleeve;

[0005] A heat exchange conduit is coaxially arranged in the evaporation preheating sleeve, a heat exchange tube is wrapped on the heat exchange conduit, and a plurality of heat exchange fins are arranged around the outside of the heat exchange tube. A main feed pipe and a main discharge pipe extend from both sides of the evaporation preheating sleeve respectively, and the main discharge pipe is connected to the evaporation tank;

[0006] A pair of three-way joints are provided at both ends of the heat exchange pipe, and two pairs of docking seats are symmetrically provided at both ends of the evaporation preheating sleeve, and the two ends of a pair of three-way joints are respectively connected to the two pairs of docking seats;

[0007] One end of the exhaust condenser pipe is connected to a docking seat of one of the three-way joints in a pair, the evaporator is connected to an evaporator air inlet pipe, a supplementary air pipe is branched out from the evaporator air inlet pipe, the supplementary air pipe and the exhaust condenser pipe are connected to two docking seats of a three-way joint, and a condensation duct is connected to a docking seat of the other three-way joint in the pair.

[0008] Preferably, the outside of the evaporation preheating sleeve is connected to a fixed bracket, and the fixed bracket is connected to the evaporation tank.

[0009] Preferably, the heat exchange tube is a tube-type structure and has a plurality of heat conduction grooves arranged in a ring array formed inside, and a plurality of heat conduction blocks are protrudingly provided on the outer surface of the heat exchange tube.

[0010] Preferably, the heat exchange fins are a plurality of plates in annular structures and are arranged on the heat exchange tubes in a unidirectional linear array.

[0011] Preferably, two pairs of control valves are provided on the two pairs of docking seats.

[0012] Preferably, the exhaust condenser pipe, the supplementary air pipe and the condenser duct are connected to the docking seat via flanges. Beneficial Effects

[0013] The utility model provides a methanol alkali solution preheating device for sodium methoxide production. It has the following beneficial effects: the methanol alkali solution preheating device for sodium methoxide production is used for preheating the methanol alkali solution before evaporation, and the methanol alkali solution is preheated by using the heat of the separation steam of the evaporator. The preheating structure adopts an integrated evaporation sleeve, and the pipeline of the separation steam is connected by a flange, and the valve is used for control. The structure is simple, the preheating control is convenient, and the heat utilization rate and reaction efficiency can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of a methanol alkaline solution preheating device for sodium methoxide production described in the utility model.

[0015] Figure 2 It is a partial three-dimensional structural schematic diagram of a methanol alkaline solution preheating device for sodium methoxide production described in the utility model.

[0016] Figure 3 It is a partial side structural schematic diagram of a methanol alkaline solution preheating device for sodium methoxide production described in the utility model.

[0017] In the figure: 1. Evaporator; 2. Evaporation tank; 3. Evaporation preheating sleeve; 4. Exhaust condenser; 5. Heat exchange duct; 6. Heat exchange tube; 7. Heat exchange fin; 8. Main feed pipe; 9. Main discharge pipe; 10. Three-way joint; 11. Docking seat; 12. Evaporation air inlet pipe; 13. Supplementary air pipe; 14. Condensation duct; 15. Fixed bracket; 16. Control valve. DETAILED DESCRIPTION

[0018] 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. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. 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.

[0019] See also Figure 1-3 The utility model provides an implementation scheme: in the alkali preparation process of sodium methoxide, it is necessary to separate the methanol alkali solution by evaporation separation. However, since the methanol alkali solution needs to be left to stand, the temperature of the methanol alkali solution after standing is relatively low. Therefore, it absorbs the heat of the vaporizer during evaporation, which reduces the heat utilization efficiency. At the same time, the methanol alkali solution heats up slowly, which reduces the processing efficiency. Therefore, the application discloses a methanol alkali solution preheating device for sodium methoxide production. The device uses an evaporator 1 as a bottom support, and an evaporation tank 2 is provided on the upper part of the evaporator 1. The evaporator 1 heats and evaporates the evaporation tank 2. An evaporation preheating sleeve 3 is provided on one side of the evaporation tank 2. The evaporation preheating sleeve 3 is used to pass the methanol alkali solution into the evaporation tank 2. An exhaust condenser 4 is provided on the evaporation tank 2 on one side of the evaporation preheating sleeve 3. The separation steam generated by the evaporation tank 2 is discharged from the exhaust condenser 4. Since the residual heat of the separation steam is relatively large, the exhaust condenser 4 is connected to the evaporation preheating sleeve 3, and the exhaust condenser 4 is used to preheat the methanol alkali solution passing through the evaporation preheating sleeve 3.

[0020] According to the instruction manual Figure 1-3 It can be seen that a main feed pipe 8 and a main discharge pipe 9 are extended from both sides of the evaporation preheating sleeve 3, respectively. The main discharge pipe 9 is connected to the evaporation tank 2, and the main feed pipe 8 is connected to an external feeding device, so that the methanol alkaline solution is introduced into the evaporation preheating sleeve 3, and after preheating, it is discharged from the evaporation preheating sleeve 3 into the evaporation tank 2, thereby increasing the initial temperature of the methanol alkaline solution and improving the reaction efficiency.

[0021] According to the instruction manual Figure 1-3It can be seen that a heat exchange conduit 5 is coaxially arranged in the above-mentioned evaporation preheating sleeve 3, and a heat exchange tube 6 is wrapped on the heat exchange conduit 5. A plurality of heat exchange fins 7 are arranged around the outer ring of the heat exchange tube 6. The heat exchange conduit 5 is in contact with the heat exchange tube 6 to realize heat exchange between the heat exchange tube 6 and the heat exchange conduit 5. The two ends of the tees of the heat exchange conduit 5 are respectively connected to two pairs of docking seats 11. The condensation exhaust pipe discharges the evaporation steam with residual heat from the heat exchange conduit 5. When the separated steam passes through the heat exchange conduit 5, the heat exchange fins 7 are used to exchange heat with the methanol alkaline solution passing through the evaporation preheating sleeve 3 to preheat the methanol alkaline solution.

[0022] The evaporator 1 is connected to an evaporation air inlet pipe 12, which is connected to the exhaust condenser 4 on two docking seats 11 of a three-way joint 10 through a supplementary air pipe 13 on the evaporation air inlet pipe 12. When the preheating energy of the exhaust condenser 4 is insufficient, the preheating steam is supplemented by the supplementary air pipe 13. A condensation duct 14 is connected to a docking seat 11 of another three-way joint 10 of the supplementary air pipe 13 to discharge the separated steam.

[0023] As a preferred solution, further, the outside of the evaporation preheating sleeve 3 is connected with a fixing bracket 15 , and the fixing bracket 15 is connected to the evaporation tank 2 for fixing the evaporation preheating sleeve 3 .

[0024] As a preferred solution, further, the heat exchange tube 6 is a tube-type structure and has a plurality of heat conduction grooves arranged in a circular array inside, and a plurality of heat conduction blocks are protruding from the outer surface of the heat exchange conduit 5 to improve the heat exchange efficiency between the heat exchange tube 6 and the heat exchange conduit 5.

[0025] As a preferred solution, further, the heat exchange fins 7 are a plurality of plates in annular structures and are arranged in a unidirectional linear array on the heat exchange tube 6 to improve the heat exchange efficiency of the heat exchange tube 6.

[0026] As a preferred solution, further, two pairs of control valves 16 are provided on the two pairs of docking seats 11 for controlling the opening and closing of the steam passage.

[0027] As a preferred solution, further, the exhaust condenser pipe 4 , the supplementary air pipe 13 and the condensation duct 14 are connected to the docking seat 11 through flanges, which facilitates the disassembly and assembly of the exhaust condenser pipe 4 , the supplementary air pipe 13 and the condensation duct 14 .

[0028] In summary, it can be generally known that the methanol alkali solution preheating device for sodium methoxide production is used for preheating the methanol alkali solution before evaporation, and the methanol alkali solution is preheated by using the heat of the separation steam of the evaporator 1. The preheating structure adopts an integrated evaporation sleeve, which is connected to the separation steam pipeline by a flange and controlled by a valve. The structure is simple and the preheating control is convenient, which can effectively improve the heat utilization rate and the reaction efficiency.

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

Claims

1. A methanol alkaline solution preheating device for sodium methoxide production, comprising an evaporator (1), the upper part of the evaporator (1) being an evaporation tank (2), one side of the evaporation tank (2) being provided with an evaporation preheating sleeve (3), and the evaporation tank (2) being provided with an exhaust condensation pipe (4) on one side of the evaporation preheating sleeve (3), wherein: The exhaust condensation pipe (4) is connected to the evaporation preheating sleeve (3); A heat exchange conduit (5) is coaxially arranged inside the evaporation preheating sleeve (3), a heat exchange tube (6) is wrapped around the heat exchange conduit (5), a plurality of heat exchange fins (7) are arranged around the outside of the heat exchange tube (6), a main feed pipe (8) and a main discharge pipe (9) extend from both sides of the evaporation preheating sleeve (3), and the main discharge pipe (9) is connected to the evaporation tank (2); A pair of three-way joints (10) are provided at both ends of the heat exchange conduit (5), and two pairs of docking seats (11) are symmetrically provided at both ends of the evaporation preheating sleeve (3), and the two ends of the pair of three-way joints (10) are respectively connected to the two pairs of docking seats (11); One end of the exhaust condensation pipe (4) is connected to a docking seat (11) of one of the three-way joints (10) in the pair, the evaporator (1) is connected to an evaporation air inlet pipe (12), a supplementary air pipe (13) is branched off from the evaporation air inlet pipe (12), the supplementary air pipe (13) and the exhaust condensation pipe (4) are connected to two docking seats (11) of one of the three-way joints (10), and a condensation conduit (14) is connected to a docking seat (11) of another of the three-way joints (10) in the pair.

2. A methanol alkaline solution preheating device for sodium methoxide production according to claim 1, characterized in that: The outside of the evaporation preheating sleeve (3) is connected to a fixed bracket (15), and the fixed bracket (15) is connected to the evaporation tank (2).

3. A methanol alkaline solution preheating device for sodium methoxide production according to claim 2, characterized in that: The heat exchange tube (6) is a tube-shaped structure and has a plurality of heat conduction grooves arranged in a ring array therein, and a plurality of heat conduction blocks are protrudingly provided on the outer surface of the heat exchange conduit (5).

4. A methanol alkaline solution preheating device for sodium methoxide production according to claim 3, characterized in that: The heat exchange fins (7) are a plurality of plates with an annular structure and are arranged on the heat exchange tube (6) in a unidirectional linear array.

5. A methanol alkaline solution preheating device for sodium methoxide production according to claim 4, characterized in that: Two pairs of control valves (16) are arranged on the two pairs of docking seats (11).

6. A methanol alkaline solution preheating device for sodium methoxide production according to claim 5, characterized in that: The exhaust condensation pipe (4), the supplementary air pipe (13) and the condensation conduit (14) are connected to the docking seat (11) via flanges.

Images