Reaction tank for preparing formaldehyde from methanol

Abstract

The utility model discloses a reaction tank for preparing formaldehyde from methanol, which comprises a tank body, the top of the tank body is fixedly connected with a support, the support is fixedly connected with an exhaust joint, a vertical pipe is rotatably mounted in the tank body, and two ends of the vertical pipe extend to the outer side of the tank body. The top end of the vertical pipe and the exhaust connector are provided with a rotating connector, and the bottom end of the vertical pipe is rotationally connected with a high-temperature steam connecting box. According to the utility model, high-temperature steam is introduced into the vertical pipe at a high speed and pushes the inner paddle to rotate in the flowing process so as to drive the vertical pipe to rotate synchronously, so that formaldehyde reaction liquid is stirred, and meanwhile, the high-temperature steam is shunted into each arc-shaped heat conduction pipe to increase the contact area with the formaldehyde solution; meanwhile, the formaldehyde solution is stirred along with rotation of the vertical pipe, and heating and stirring are integrated, so that the device has the advantages that the structure is more compact and simpler, heating and stirring are integrated, the heating efficiency is high, and the energy consumption cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of formaldehyde reaction tanks, in particular to a reaction tank used for preparing formaldehyde from methanol. Background Art

[0002] Formaldehyde is an important raw material for the production of adhesives such as urea-formaldehyde resin and phenol-formaldehyde resin. In the textile industry, formaldehyde can be used to produce functional textiles such as wrinkle-resistant, shrinkage-resistant, and flame-retardant. Formaldehyde can also be used in medicine, pesticides and other fields. Methanol is widely available and has low cost, so formaldehyde is often prepared through methanol.

[0003] Currently, the majority of industrial methods for producing formaldehyde from methanol are based on silver-catalyzed oxidation. Methanol is first evaporated into methanol vapor in an evaporator and then mixed with filtered, preheated air. The mixed gas then enters a fixed-bed reactor containing a silver catalyst for reaction. The product undergoes cooling and condensation, converting the formaldehyde gas into a liquid formaldehyde solution. Unreacted methanol and other gases can be recovered.

[0004] Iron-molybdenum catalytic oxidation: Methanol is vaporized and mixed with air before reacting in a reactor containing an iron-molybdenum catalyst. The reaction product undergoes cooling and absorption to produce a formaldehyde solution. Unreacted methanol and other gases are recycled or further processed.

[0005] Both of the above preparation methods require the raw materials to be heated for reaction and reversed in the reaction tank, and the reaction tank needs to be continuously heated. The reaction tank generally uses an electric heating lining with a stirring mechanism to heat the formaldehyde reaction liquid, and uses high-temperature steam to connect to the internal spiral pipe for heating. This type of structure has low heating efficiency and requires the addition of an independent stirring mechanism to drive the liquid flow, which complicates the structure of the equipment, making the cost of formaldehyde preparation high and the energy consumption high. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a reaction tank for preparing formaldehyde from methanol to solve the above-mentioned background technical problems.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A reaction tank for preparing formaldehyde from methanol comprises a tank body, a bracket fixedly connected to the top of the tank body, an exhaust joint fixedly connected to the bracket, a vertical pipe rotatably mounted inside the tank body, both ends of the vertical pipe extending to the outside of the tank body, a rotating joint mounted between the top of the vertical pipe and the exhaust joint, a high-temperature steam connection box rotatably connected to the bottom end of the vertical pipe, two inner blades mounted inside the vertical pipe, and arc-shaped heat conduction pipes equidistantly arranged fixedly connected to the outside of the vertical pipe.

[0009] As a further description of the above technical solution: the outer side of the arc-shaped heat-conducting pipe is fixedly connected with stirring wave plates arranged at equal distances, and the arc-shaped heat-conducting pipe is divided into two groups, the inner and outer groups.

[0010] As a further description of the above technical solution: an outer side of the vertical pipe is fixedly connected with an outer spiral sheet, and the outer spiral sheet guides the flow downward.

[0011] As a further description of the above technical solution: two discharge valve pipes are fixedly connected to the bottom of the tank body.

[0012] As a further description of the above technical solution: an inclined feeding pipe is fixedly connected to the top of the tank body.

[0013] As a further description of the above technical solution: a pressure display gauge is fixedly connected to the bottom of the high-temperature steam connection box.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] This solution utilizes steam as a heat source and power source to drive the vertical pipe to rotate, and at the same time, heats and stirs the formaldehyde solution through the arc-shaped heat-conducting pipe, thereby achieving the advantages of a more compact and simple structure, integrated heating and stirring, high heating efficiency, and reduced energy consumption costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the front cross-sectional structure of the present utility model;

[0017] Figure 2 for Figure 1 A magnified schematic diagram of the structure of part A in the middle;

[0018] Figure 3 It is a schematic diagram of a partial top-view cross-sectional structure of the present invention;

[0019] Figure 4 It is a partial three-dimensional structural diagram of the utility model.

[0020] Description of the numbers in the figure:

[0021] 1. Tank body; 2. Bracket; 3. Exhaust connector; 4. Vertical pipe; 41. Outer spiral blade; 5. Rotating joint; 6. High-temperature steam connection box; 61. Pressure display gauge; 7. Inner blade; 8. Arc-shaped heat conduction pipe; 81. Stirring wave plate; 9. Discharge valve pipe; 10. Feed pipe. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0023] See also Figure 1-4 A reaction tank for preparing formaldehyde from methanol includes a tank body 1, a bracket 2 is fixedly connected to the top of the tank body 1, an exhaust joint 3 is fixedly connected to the bracket 2, a vertical pipe 4 is rotatably installed inside the tank body 1, both ends of the vertical pipe 4 extend to the outside of the tank body 1, a rotating joint 5 is installed between the top of the vertical pipe 4 and the exhaust joint 3, a high-temperature steam connection box 6 is rotatably connected to the bottom end of the vertical pipe 4, two inner blades 7 are installed inside the vertical pipe 4, and arc-shaped heat conduction pipes 8 arranged at equal distances are fixedly connected to the outside of the vertical pipe 4.

[0024] In the present invention, the tank body 1 is used as the main body of the device. When in use, the formaldehyde reaction liquid is first injected into the interior of the tank body 1, and then the high-temperature steam connecting box 6 is connected to the high-temperature steam source through a hose. Then the high-temperature steam is passed into the interior of the vertical pipe 4 at a high speed. During the flow, the inner blade 7 is pushed to rotate to drive the vertical pipe 4 to rotate synchronously, so as to achieve stirring of the formaldehyde reaction liquid. At the same time, the high-temperature steam will be diverted to the interior of each arc-shaped heat-conducting pipe 8 to increase the contact area with the formaldehyde solution. At the same time, as the vertical pipe 4 rotates, the formaldehyde solution is stirred. The integrated heating and stirring design realizes that the device has the advantages of more compact and simple structure, integrated heating and stirring, high heating efficiency, and reduced energy consumption cost. It solves the problem that the reaction tank in the prior art generally uses an electric heating lining in combination with a stirring mechanism to heat the formaldehyde reaction liquid, and uses high-temperature steam to connect to the internal spiral pipe for heating. The heating efficiency of this type of structure is low, and an independent stirring mechanism needs to be added to drive the liquid flow, resulting in a complicated structure of the equipment, high cost and high energy consumption.

[0025] See also Figure 1 and Figure 4 , wherein: the outer side of the arc-shaped heat-conducting pipe 8 is fixedly connected with stirring wave plates 81 arranged at equal distances, and the arc-shaped heat-conducting pipe 8 is divided into two groups, the inner and outer groups.

[0026] In the present invention, the wave plate 81 is stirred to make the rotating arc-shaped heat conducting pipe 8 have a better stirring effect on the formaldehyde solution.

[0027] See also Figure 1 and Figure 4, wherein: the outer side of the vertical tube 4 is fixedly connected to an outer spiral sheet 41, and the outer spiral sheet 41 guides the flow downward. When the vertical tube 4 rotates, the outer spiral sheet 41 pulls the formaldehyde solution at the center downward to drive the formaldehyde solution to achieve horizontal stirring and vertical flow, so that the solution stirring effect is better and the heating efficiency is improved.

[0028] See also Figure 1 , wherein: two discharge valve pipes 9 are fixedly connected to the bottom of the tank body 1; the discharge valve pipes 9 facilitate the operation of discharging.

[0029] See also Figure 1 , wherein: an inclined feeding pipe 10 is fixedly connected to the top of the tank body 1, and the formaldehyde reaction liquid is conveniently injected through the feeding pipe 10 to achieve feeding.

[0030] See also Figure 1 , wherein: a pressure display gauge 61 is fixedly connected to the bottom of the high-temperature steam connection box 6, and the pressure display gauge 61 is convenient for displaying the steam pressure inside the vertical pipe 4 for easy observation.

[0031] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed in the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A reaction tank for preparing formaldehyde from methanol, comprising a tank body (1), characterized in that: The top of the tank body (1) is fixedly connected to a bracket (2), an exhaust joint (3) is fixedly connected to the bracket (2), a vertical pipe (4) is rotatably installed inside the tank body (1), both ends of the vertical pipe (4) extend to the outside of the tank body (1), a rotating joint (5) is installed between the top of the vertical pipe (4) and the exhaust joint (3), a high-temperature steam connection box (6) is rotatably connected to the bottom end of the vertical pipe (4), two inner blades (7) are installed inside the vertical pipe (4), and arc-shaped heat conduction pipes (8) arranged at equal distances are fixedly connected to the outside of the vertical pipe (4).

2. The reaction tank for preparing formaldehyde from methanol according to claim 1, characterized in that: The outer side of the arc-shaped heat-conducting pipe (8) is fixedly connected with stirring wave plates (81) arranged at equal distances, and the arc-shaped heat-conducting pipe (8) is divided into two groups, an inner group and an outer group.

3. The reaction tank for preparing formaldehyde from methanol according to claim 1, characterized in that: An outer spiral sheet (41) is fixedly connected to the outer side of the vertical pipe (4), and the outer spiral sheet (41) guides the flow downward.

4. The reaction tank for preparing formaldehyde from methanol according to claim 1, characterized in that: Two discharge valve pipes (9) are fixedly connected to the bottom of the tank body (1).

5. The reaction tank for preparing formaldehyde from methanol according to claim 1, characterized in that: An inclined feeding pipe (10) is fixedly connected to the top of the tank body (1).

6. The reaction tank for preparing formaldehyde from methanol according to claim 1, characterized in that: A pressure display gauge (61) is fixedly connected to the bottom of the high-temperature steam connection box (6).

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