Methylal production raw material mixer and working method thereof

Abstract

The invention discloses a methylal production raw material mixer and a working method thereof. The methylal production raw material mixer comprises a kettle body, the outer wall of the kettle body is fixedly sleeved with a bottom sleeve, a plurality of supporting legs are arranged on the outer side wall face of the bottom sleeve, and a discharging valve is arranged at the lower end of the kettle body; the invention relates to the technical field of methylal production technologies, and has the beneficial effects that liquid formaldehyde is intermittently dropwise added through linkage control of a rotating plug and a lifting plug when the liquid formaldehyde is added, and the liquid formaldehyde is dropwise added dispersedly through a plurality of droppers, so that local reaction overheating caused by concentrated addition is avoided, side reactions are reduced, and the production efficiency is improved. The dropper penetrates through the heating cavity of the kettle cover with the special-shaped cavity, and the liquid formaldehyde is preheated before being dropwise added, so that the temperature of a mixed solution is prevented from being suddenly reduced by a low-temperature raw material, and the catalytic activity is ensured; the cylindrical cavity surface of the special-shaped cavity kettle cover extends into the kettle body, and heat is directly supplemented to the central area of a reaction system on the basis of outer layer heating, so that the temperature gradient is eliminated.

Description

Technical Field

[0001] This invention relates to the field of methyl acetal production technology, and in particular to a methyl acetal production raw material mixer and its working method. Background Technology

[0002] Methylal, also known as formaldehyde dimethyl acetal, is a chemical typically formed by the condensation of formaldehyde and methanol under the action of an acidic catalyst. It possesses unique chemical properties and applications. Methylal is a colorless, transparent liquid with stable properties. In the large-scale catalytic preparation of methylal, the chemical bonds between liquid methanol and liquid formaldehyde break and recombine under the action of a liquid acid catalyst, generating a significant amount of heat. Excessive reaction temperature can trigger a series of side reactions. For example, when the temperature exceeds 60°C or the formaldehyde concentration is too high, formaldehyde molecules condense through hydroxymethyl (-CH2OH) to form chain or cyclic paraformaldehyde. When the temperature exceeds 80°C, formaldehyde and methanol undergo esterification to form methyl formate. These side reactions increase the complexity of the final product and reduce the purity of methylal. Therefore, the catalytic preparation of methylal typically employs a dropwise addition of liquid formaldehyde.

[0003] Furthermore, in the synthesis of methyl acetal, excessively low temperatures can cause a sharp decrease in the reaction rate constant, reducing the reaction rate and necessitating additional equipment or extending the production cycle, thus increasing costs. Therefore, temperature control is crucial in the production of methyl acetal. The relevant existing technologies are as follows;

[0004] 1. A mixer for the production of methylal, disclosed in CN217855561 U, includes a constant temperature water bath tank, a mixing tank fixedly installed on the top inner wall of the constant temperature water bath tank, the top of the mixing tank extending outside the constant temperature water bath tank, a partition fixedly installed inside the mixing tank, and a mixing mechanism provided inside the mixing tank; the mixing mechanism includes two cylinders, two rotating rods, multiple first stirring paddles, multiple second stirring paddles, two synchronous gears, two linkage wheels, a synchronous belt, and a drive assembly, with both cylinders rotatably mounted on the partition plate;

[0005] 2. A catalyst addition device disclosed in CN206868186U includes a catalyst storage tank, a catalyst outlet at the bottom of the catalyst storage tank, and a first catalyst pipe connected to the catalyst outlet; a buffer tank connected to the first catalyst pipe, and a second catalyst pipe externally connected to the buffer tank, the second catalyst pipe being connected to a reaction vessel; a glass sight glass mounted on the first catalyst pipe; and an overflow balance pipe, one end of which is connected to the catalyst storage tank and the other end of which is connected to the buffer tank.

[0006] In the aforementioned prior art, raw materials that are prone to causing localized high temperatures are all added to the equipment through a single feeding channel. This makes it inconvenient to adjust the amount and speed of raw material addition, resulting in poor flexibility and a tendency to cause localized high temperatures and side reactions. Furthermore, the equipment only has temperature regulation functions on its outer wall. After the raw materials are added to the equipment, only the material close to the outer wall of the equipment can exchange heat quickly, which can lead to lag in heat transfer within the reaction system, easily forming a temperature gradient and affecting the reaction quality. In view of this, in-depth research was conducted to address the above problems, which led to the development of this invention. Summary of the Invention

[0007] The purpose of this invention is to solve the above-mentioned problems by designing a raw material mixer for methylal production and its working method. This invention addresses the issues in existing technologies where raw materials prone to localized high temperatures are added to the equipment through a single feeding channel, making it difficult to adjust the amount and speed of raw material addition, resulting in poor flexibility, high localized temperatures, and side reactions. Furthermore, the equipment only has temperature regulation functionality on its outer wall, meaning that only materials close to the outer wall can quickly exchange heat after the raw materials are added, leading to lag in heat transfer within the reaction system, the formation of temperature gradients, and negatively impacting reaction quality.

[0008] The technical solution of the present invention to achieve the above objectives is as follows: a raw material mixer for methylal production, comprising a vessel body, a bottom sleeve fixedly fitted on the outer wall of the vessel body, multiple support legs provided on the outer wall of the bottom sleeve, a discharge valve provided at the lower end of the vessel body, the discharge valve penetrating through the lower end of the bottom sleeve, a shaped cavity vessel cover connected to a flange on the vessel body, a stirrer provided at the center of the shaped cavity vessel cover, a drip feeder provided on the shaped cavity vessel cover and on both sides of the stirrer, and a feeding valve also provided on the shaped cavity vessel cover;

[0009] The irregularly shaped hollow vessel lid includes a sealing surface, which is attached to the vessel body. The sealing surface extends upward to a vertical surface, and extends inward to an annular surface. The annular surface extends into the vessel body to a cylindrical cavity surface. The bottom of the cylindrical cavity surface is filled with an installation surface. A top sleeve is installed on the vertical surface, and one end of the feeding valve passes through the top sleeve and the annular surface.

[0010] The dispenser includes a storage end, and multiple droppers are installed on the lower wall of the storage end. Each dropper passes through the top sleeve and the annular surface, and a mode adjustment valve is installed at one end of each dropper.

[0011] Preferably, the storage end includes a cylindrical storage box, which is installed on the upper wall of the top sleeve. Multiple drip holes are arranged in a circular array on the lower wall of the cylindrical storage box, with the multiple drip holes arranged in a circular array around the axis of the cylindrical storage box. Multiple droppers are inserted into the multiple drip holes. A rotating rod is movably inserted into the axis of the cylindrical storage box. A rotating plug is installed at one end of the rotating rod inside the cylindrical storage box. The rotating plug has a notch that corresponds to the drip hole. The rotating plug is movably fitted against the inner bottom surface of the cylindrical storage box. The rotating rod inside the cylindrical storage box has a thread, and a lifting plug is movably fitted onto the rotating rod through the thread. A guide rod is provided on the inner top surface of the cylindrical storage box, and the lifting plug is movably fitted onto the guide rod. A respirator is installed on the upper wall of the cylindrical storage box.

[0012] Preferably, the respirator includes a tube inserted into the upper wall of a cylindrical storage box, with a bag fixedly fitted at one end of the tube outside the cylindrical storage box, and a protective cover fixedly fitted on the tube and outside the bag.

[0013] Preferably, a delivery valve is provided on the outer wall of the cylindrical storage box, near the upper wall of the rotating plug, a first motor is installed at one end of the rotating rod, and a first stabilizing frame is provided between the first motor and the cylindrical storage box.

[0014] Preferably, the stirrer includes a stirring shaft that movably passes through the mounting surface and the center of the top sleeve. A stirring frame is mounted on the inner side wall of the vessel body, and the stirring frame includes a bottom scraper that movably fits against the mounting surface. An inner wall scraper extends upward from the bottom scraper and movably fits against the cylindrical cavity surface. A connecting plate extends laterally from one end of the inner wall scraper, and an outer wall scraper extends downward from one end of the connecting plate. The outer wall scraper movably fits against the inner side wall of the vessel body. Stirring blades are longitudinally arranged on the part of the stirring shaft below the bottom scraper.

[0015] Preferably, multiple stirring rods are provided on the opposing wall surfaces of the inner wall scraper and the outer wall scraper, a second motor is installed at one end of the stirring shaft outside the top sleeve, and a second stabilizing frame is provided between the second motor and the columnar storage box.

[0016] Preferably, a first medium inlet and a first medium outlet are provided on the side wall of the bottom sleeve.

[0017] Preferably, a second medium inlet and a second medium outlet are provided on the side wall of the top sleeve.

[0018] Preferably, the tip of each of the drip holes is a funnel-shaped structure, and the dropper matches the drip hole.

[0019] A working method includes the following operational steps;

[0020] Step 1: The device is erected in the target area by multiple legs on the bottom sleeve, and liquid methanol and liquid catalyst are added through the feeding valve on the irregular cavity vessel cover;

[0021] Step 2: Close the mode adjustment valve and open the delivery valve. At the same time, the first motor works in reverse, driving the rotating rod to rotate and the lifting plug to rise, sucking the liquid formaldehyde into the columnar storage box. During the suction process, the bag balances the air pressure in the box through the connecting pipe.

[0022] Step 3: Open the mode adjustment valve and close the delivery valve. At the same time, the first motor works in the forward direction. The rotating plug rotates to periodically align the notch with the drip hole. The lifting plug is pressed down. Liquid formaldehyde is preheated as it passes through multiple drip tubes. Then, it is intermittently and dispersedly dripped into different positions in the reactor body through the mode adjustment valve.

[0023] Step 4: The second motor drives the stirring shaft, which in turn drives the stirring frame and stirring blades to rotate and mix the raw materials for methyl acetal production.

[0024] Step 5: After the raw materials for methyl acetal production are mixed, open the discharge valve at the bottom of the reactor body, and the mixed material will be discharged from the discharge valve.

[0025] The methyl acetal production raw material mixer and its working method, manufactured using the technical solution of this invention, achieve intermittent dripping of liquid formaldehyde through the linkage control of the rotating plug and the lifting plug. The liquid formaldehyde is added in a dispersed manner through multiple droppers, avoiding concentrated addition that could lead to localized overheating, reducing side reactions, ensuring the purity of methyl acetal, and guaranteeing its yield. The droppers penetrate the heating cavity of the irregularly shaped hollow vessel lid, preheating the liquid formaldehyde before dripping to prevent a sudden drop in the temperature of the mixture from the low-temperature raw material, thus ensuring catalytic activity. The cylindrical cavity surface of the irregularly shaped hollow vessel lid extends into the vessel body, directly supplementing heat to the central region of the reaction system on top of the external heating, eliminating temperature gradients. Simultaneous internal and external heating significantly improves heat transfer efficiency, solving the problem of internal heat transfer lag caused by external heating only in traditional equipment, ensuring uniform and stable reaction temperature. The bottom scraper, inner wall scraper, and outer wall scraper of the stirring rack respectively adhere to the bottom of the vessel body, the central cylindrical cavity surface, and the inner wall, rotating to completely eliminate stagnant layers and ensure uniform heating. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a methyl acetal production raw material mixer according to the present invention.

[0027] Figure 2 This is a schematic diagram of the main cross-sectional structure of a methyl acetal production raw material mixer according to the present invention.

[0028] Figure 3This is a top-view three-dimensional structural diagram of the irregularly shaped cavity kettle lid, stirrer, and dropper of the methyl acetal production raw material mixer described in this invention.

[0029] Figure 4 This is a three-dimensional structural diagram from a bottom view of the assembled state of the irregularly shaped cavity vessel lid and the dropper of the methyl acetal production raw material mixer described in this invention.

[0030] Figure 5 This is a three-dimensional structural diagram of the agitator of a raw material mixer for methyl acetal production according to the present invention.

[0031] Figure 6 This is a three-dimensional structural diagram of a partial explosion at the storage end of a methyl acetal production raw material mixer according to the present invention.

[0032] Figure 7 This is a partial three-dimensional structural diagram of the storage end of the methyl acetal production raw material mixer described in this invention, viewed from a low angle.

[0033] Figure 8 The present invention relates to a raw material mixer for methyl acetal production. Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0034] In the diagram: 1. Kettle body; 2. Bottom sleeve; 3. Discharge valve; 4. Irregularly shaped hollow kettle cover; 41. Sealing surface; 42. Vertical surface; 43. Annular surface; 44. Cylindrical cavity surface; 45. Mounting surface; 46. Top sleeve; 5. Agitator; 51. Agitator shaft; 52. Bottom scraper; 53. Inner wall scraper; 54. Connecting plate; 55. Outer wall scraper; 56. Agitator blades; 57. Agitator rod; 58. Second motor; 59. Second stabilizing frame; 6. Dropper; 61. Storage end; 611. 612. Columnar storage box, 613. Rotating rod, 614. Notch, 615. Lifting plug, 616. Guide rod, 62. Breather, 621. Through pipe, 622. Bag, 623. Protective cover, 63. Dropper, 64. Delivery valve, 65. First motor, 66. First stabilizing frame, 67. Mode regulating valve, 7. Feeding valve, 8. First medium inlet, 9. First medium outlet, 10. Second medium inlet, 11. Second medium outlet, 12. Support leg. Detailed Implementation

[0035] Example 1:

[0036] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1-8 As shown, a mixer for raw materials in the production of methyl acetal.

[0037] Those skilled in the art should connect all electrical components and their compatible power supplies in this case via wires, and should select appropriate controllers according to actual conditions to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical components are connected in sequence. The detailed connection methods are well-known in the art. The following mainly introduces the working principle and process, without explaining the electrical control.

[0038] A raw material mixer for methyl acetal production includes a vessel body 1, a bottom sleeve 2 fixedly fitted on the outer wall of the vessel body 1, multiple support legs 12 provided on the outer wall of the bottom sleeve 2, a discharge valve 3 provided at the lower end of the vessel body 1, the discharge valve 3 passing through the lower end of the bottom sleeve 2, a shaped cavity vessel cover 4 connected to the flange on the vessel body 1, a stirrer 5 provided at the center of the shaped cavity vessel cover 4, a drip feeder 6 provided on the shaped cavity vessel cover 4 and on both sides of the stirrer 5, and a feeding valve 7 provided on the shaped cavity vessel cover 4.

[0039] It should be noted that the device is supported by multiple legs 12 in the target area. Two feeding valves 7 can be installed on the irregular cavity vessel lid 4, which are used to add liquid methanol and liquid catalyst for the preparation of methyl acetal, respectively. The dropper 6 is used to add liquid formaldehyde. The stirrer 5 is used to mix and stir the methyl acetal preparation raw materials inside the vessel body 1. The irregular cavity vessel lid 4 is used to seal the vessel body 1. A heating medium flows between the bottom sleeve 2 and the vessel body 1 to provide a standard temperature environment for the mixing of methyl acetal raw materials.

[0040] Specifically, the irregular cavity vessel cover 4 includes a sealing surface 41, which is attached to the vessel body 1. The sealing surface 41 extends upward to a vertical surface 42, and the vertical surface 42 extends inward to an annular surface 43. The annular surface 43 extends into the vessel body 1 to a cylindrical cavity surface 44. The bottom of the cylindrical cavity surface 44 is filled with an installation surface 45. A top sleeve 46 is installed on the vertical surface 42. One end of the feeding valve 7 passes through the top sleeve 46 and the annular surface 43.

[0041] It should be noted that the sealing surface 41 is used for the flange connection between the irregular cavity vessel cover 4 and the vessel body 1, and the vertical surface 42, the annular surface 43, the cylindrical cavity surface 44, the mounting surface 45 and the top sleeve 46 are used for the flow of heating medium.

[0042] Specifically, the dropper 6 includes a storage end 61, and multiple drop tubes 63 are installed on the lower wall of the storage end 61. Each drop tube 63 passes through the top sleeve 46 and the annular surface 43, and a mode adjustment valve 67 is installed at one end of each drop tube 63.

[0043] It should be noted that liquid formaldehyde flows from storage end 61 into multiple dropper sections 63. The heating medium flowing inside the irregularly shaped cavity lid 4 can preheat the liquid formaldehyde in the dropper section 63, preventing the lower-temperature liquid formaldehyde from mixing into the mixture of liquid methanol and liquid catalyst, avoiding a sudden drop in local temperature, avoiding a decrease in catalytic activity, avoiding a prolonged reaction time, and ensuring the conversion rate of methylal. In addition to the heating medium flowing between the bottom sleeve 2 and the vessel body 1 to heat the mixture inside the vessel body 1, the cylindrical cavity surface 44 extends into the interior of the vessel body 1, and the heating medium flowing inside the irregularly shaped cavity lid 4 also provides heat supplementation to the methylal preparation raw materials in the center of the vessel body 1, avoiding the generation of temperature steps. Compared with external heating only, this improves the speed of temperature transfer and ensures the quality of the reaction.

[0044] Specifically, the storage end 61 includes a cylindrical storage box 611, which is installed on the upper wall of the top sleeve 46. Multiple drip holes are arranged in a circular array on the lower wall of the cylindrical storage box 611, with the multiple drip holes arranged in a circular array around the axis of the cylindrical storage box 611. Multiple droppers 63 are respectively inserted into the multiple drip holes. A rotating rod 612 is movably inserted into the axis of the cylindrical storage box 611, and a rotating plug 613 is installed at one end of the rotating rod 612 inside the cylindrical storage box 611. The rotating plug 613 has a notch 614, which corresponds to the drip hole. The rotating plug 613 is movably attached to the inner bottom surface of the cylindrical storage box 611. The rotating rod 612 is located inside the cylindrical storage box 611 and has a thread. The lifting plug 615 is movably fitted on the rotating rod 612 through the thread. The guide rod 616 is provided on the inner top surface of the cylindrical storage box 611. The lifting plug 615 is movably fitted on the guide rod 616. The respirator 62 is installed on the upper wall of the cylindrical storage box 611.

[0045] Specifically, the respirator 62 includes a tube 621, which is inserted into the upper wall of the cylindrical storage box 611. A bag 622 is fixedly fitted to one end of the tube 621 outside the cylindrical storage box 611. A protective cover 623 is fixedly fitted on the tube 621 and outside the bag 622.

[0046] Specifically, a delivery valve 64 is provided on the outer wall of the cylindrical storage box 611 and near the upper wall of the rotating plug 613. A first motor 65 is installed at one end of the rotating rod 612, and a first stabilizing frame 66 is provided between the first motor 65 and the cylindrical storage box 611.

[0047] It should be noted that the delivery valve 64 is connected to the liquid formaldehyde delivery system. When liquid formaldehyde needs to be delivered into the columnar storage tank 611, the lifting plug 615 is located at the bottom of the columnar storage tank 611 and above the delivery valve 64. The mode adjustment valve 67 is in the closed state, and the rotating plug 613 is in the closed state, that is, its notch 614 is misaligned with the drip hole. The delivery valve 64 is opened, and at the same time, the first motor 65 works in reverse, driving the rotating rod 612 to rotate. Under the limit of the guide rod 616 and the threaded connection between the rotating rod 612 and the lifting plug 615, the lifting plug 615 gradually rises, and the liquid formaldehyde is drawn into the columnar storage tank 611. The lifting plug 615 is sealed to the inner wall of the columnar storage tank 611 and the guide rod 616. Similar to a syringe, as the lifting plug 615 rises, the air above the lifting plug 615 enters the bag 622 through the through tube 621, balancing the air pressure inside the columnar storage box 611. When liquid formaldehyde needs to be added to the vessel body 1, the mode regulating valve 67 opens, the first motor 65 works in the forward direction, the rotating plug 613 rotates, and the notch 614 aligns with multiple drip holes one by one. The lifting plug 615 descends, and the liquid formaldehyde in the columnar storage box 611 is intermittently injected into the vessel body 1 through the mode regulating valve 67 on multiple drip tubes 63. This prevents excessive liquid formaldehyde from mixing with liquid methanol and liquid catalyst. At the same time, the liquid formaldehyde added in two adjacent drops falls into different positions, further preventing side reactions caused by local high temperature and ensuring the purity of the methyl acetal product.

[0048] Specifically, the stirrer 5 includes a stirring shaft 51, which movably passes through the center of the mounting surface 45 and the top sleeve 46. A stirring frame is installed on the inner side wall of the vessel body 1. The stirring frame includes a bottom scraper 52, which is movably attached to the mounting surface 45. An inner wall scraper 53 extends upward from the bottom scraper 52 and is movably attached to the cylindrical cavity surface 44. A connecting plate 54 extends laterally from one end of the inner wall scraper 53, and an outer wall scraper 55 extends downward from one end of the connecting plate 54. The outer wall scraper 55 is movably attached to the inner side wall of the vessel body 1. A stirring blade 56 is longitudinally arranged below the bottom scraper 52 on the stirring shaft 51.

[0049] Specifically, multiple stirring rods 57 are provided on the opposing wall surfaces of the inner wall scraper 53 and the outer wall scraper 55. A second motor 58 is installed at one end of the stirring shaft 51 located outside the top sleeve 46. A second stabilizing frame 59 is provided between the second motor 58 and the columnar storage box 611.

[0050] It should be noted that the stirring shaft 51 is sealed to the mounting surface 45 and the top sleeve 46. The second motor 58 is used to rotate the stirring shaft 51, which drives the stirring frame, multiple stirring rods 57 and stirring blades 56 to rotate, thus mixing the liquid raw materials. The connecting plate 54 is used to connect the inner wall scraper 53 and the outer wall scraper 55. With the operation of the second motor 58, the bottom scraper 52 rotates on the mounting surface 45, the inner wall scraper 53 rotates on the cylindrical cavity surface 44, and the outer wall scraper 55 rotates on the inner wall of the vessel body 1, eliminating the stagnant layer on the equipment wall and ensuring the mixing quality.

[0051] As a preferred and further option, a first medium inlet 8 and a first medium outlet 9 are provided on the side wall of the bottom sleeve 2; a second medium inlet 10 and a second medium outlet 11 are provided on the side wall of the top sleeve 46; for connecting the medium supply system to provide temperature conditions for the device;

[0052] Preferably, and further still, the tip of each dropper hole is a funnel-shaped structure, and the dropper 63 matches the dropper hole;

[0053] Example 2:

[0054] A working method includes the following operational steps;

[0055] Step 1: The device is erected in the target area by multiple support legs 12 on the bottom sleeve 2, and liquid methanol and liquid catalyst are added through the feeding valve 7 on the irregular cavity kettle cover 4;

[0056] Step 2: Close the mode adjustment valve 67, open the delivery valve 64, and at the same time, the first motor 65 works in reverse, driving the rotating rod 612 to rotate and the lifting plug 615 to rise, sucking the liquid formaldehyde into the columnar storage box 611. During the suction process, the bag 622 balances the air pressure in the box through the through pipe 621.

[0057] Step 3: Open the mode adjustment valve 67 and close the delivery valve 64. At the same time, the first motor 65 works in the forward direction. Rotate the rotating plug 613 to periodically align the notch 614 with the drip hole. The lifting plug 615 is pressed down. Liquid formaldehyde is preheated when it passes through multiple drip tubes 63. Then, it is intermittently and dispersedly dripped into different positions in the reactor body 1 through the mode adjustment valve 67.

[0058] Step 4: The second motor 58 drives the stirring shaft 51, which in turn drives the stirring frame and stirring blades 56 to rotate to mix the raw materials for methyl acetal production.

[0059] Step 5: After the raw materials for methyl acetal production are mixed, open the discharge valve 3 at the lower end of the reactor body 1, and the mixed material is discharged from the discharge valve 3.

[0060] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A raw material mixer for methylal production, comprising a vessel body (1), wherein a bottom sleeve (2) is fixedly fitted onto the outer wall of the vessel body (1), and a plurality of support legs (12) are provided on the outer wall surface of the bottom sleeve (2), and a discharge valve (3) is provided at the lower end of the vessel body (1), the discharge valve (3) penetrating through the lower end of the bottom sleeve (2), characterized in that, The vessel body (1) is connected to a flange with a shaped cavity vessel cover (4). A stirrer (5) is provided in the center of the shaped cavity vessel cover (4). A dropper (6) is provided on the shaped cavity vessel cover (4) and on both sides of the stirrer (5). A feeding valve (7) is also provided on the shaped cavity vessel cover (4). The irregular cavity lid (4) includes a sealing surface (41), which is attached to the vessel body (1). The sealing surface (41) extends upward to a vertical surface (42), and the vertical surface (42) extends inward to an annular surface (43). The annular surface (43) extends into the vessel body (1) to a cylindrical cavity surface (44). The bottom of the cylindrical cavity surface (44) is filled with an mounting surface (45). A top sleeve (46) is installed on the vertical surface (42). One end of the feeding valve (7) passes through the top sleeve (46) and the annular surface (43). The dispenser (6) includes a storage end (61), and a plurality of droppers (63) are installed on the lower wall of the storage end (61). Each dropper (63) passes through the top sleeve (46) and the annular surface (43), and a mode adjustment valve (67) is installed at one end of each dropper (63).

2. The methyl acetal production raw material mixer according to claim 1, characterized in that, The storage end (61) includes a cylindrical storage box (611), which is installed on the upper wall of the top sleeve (46). Multiple drip holes are arranged in a circular array on the lower wall of the cylindrical storage box (611), with the multiple drip holes arranged in a circular array around the axis of the cylindrical storage box (611). Multiple droppers (63) are respectively inserted into the multiple drip holes. A rotating rod (612) is movably inserted into the axial part of the cylindrical storage box (611). A rotating plug (613) is installed at one end of the rotating rod (612) inside the cylindrical storage box (611). (613) has a notch (614) and the notch (614) is corresponding to the drip hole. The rotating plug (613) is movably attached to the bottom inner side of the cylindrical storage box (611). The rotating rod (612) is threaded inside the cylindrical storage box (611). The rotating rod (612) is movably fitted with a lifting plug (615) through the thread. The top inner side of the cylindrical storage box (611) is provided with a guide rod (616). The lifting plug (615) is movably fitted on the guide rod (616). A respirator (62) is installed on the upper wall of the cylindrical storage box (611).

3. The methylal production raw material mixer according to claim 2, characterized in that, The respirator (62) includes a tube (621) inserted into the upper wall of a cylindrical storage box (611). A bag (622) is fixedly fitted at one end of the tube (621) outside the cylindrical storage box (611). A protective cover (623) is fixedly fitted on the tube (621) and outside the bag (622).

4. A methylal production raw material mixer according to claim 2, characterized in that, A delivery valve (64) is provided on the outer wall of the cylindrical storage box (611) and near the upper wall of the rotating plug (613). A first motor (65) is installed at one end of the rotating rod (612), and a first stabilizing frame (66) is provided between the first motor (65) and the cylindrical storage box (611).

5. A methylal production raw material mixer according to claim 2, characterized in that, The stirrer (5) includes a stirring shaft (51), which movably passes through the center of the mounting surface (45) and the top sleeve (46). The stirring shaft (51) is mounted on the inner side wall of the vessel body (1) with a stirring frame. The stirring frame includes a bottom scraper (52), which is movably attached to the mounting surface (45). The bottom scraper (52) extends upward to an inner wall scraper (53), which is movably attached to the cylindrical cavity surface (44). One end of the inner wall scraper (53) extends laterally to a connecting plate (54), and one end of the connecting plate (54) extends downward to an outer wall scraper (55), which is movably attached to the inner side wall of the vessel body (1). The stirring shaft (51) is longitudinally arranged with stirring blades (56) below the bottom scraper (52).

6. A methylal production raw material mixer according to claim 5, characterized in that, Multiple stirring rods (57) are provided on the opposing wall surfaces of the inner wall scraper (53) and the outer wall scraper (55). A second motor (58) is installed at one end of the stirring shaft (51) outside the top sleeve (46). A second stabilizing frame (59) is provided between the second motor (58) and the columnar storage box (611).

7. A methyl acetal production raw material mixer according to claim 1, characterized in that, The bottom sleeve (2) is provided with a first medium inlet (8) and a first medium outlet (9) on its side wall.

8. A methylal production raw material mixer according to claim 1, characterized in that, The top sleeve (46) is provided with a second medium inlet (10) and a second medium outlet (11) on its side wall.

9. A raw material mixer for methylal production according to claim 2, characterized in that, The tip of each of the drip holes is a trumpet-shaped structure, and the dropper (63) matches the drip hole.

10. A working method applied to a methylal production raw material mixer according to any one of claims 1-9, characterized in that, The following steps are included; Step 1: The device is erected in the target area by multiple legs (12) on the bottom sleeve (2), and liquid methanol and liquid catalyst are added through the feeding valve (7) on the irregular cavity kettle cover (4); Step 2: Close the mode adjustment valve (67), open the delivery valve (64), and at the same time, the first motor (65) works in reverse, driving the rotating rod (612) to rotate, and the lifting plug (615) rises to suck the liquid formaldehyde into the columnar storage box (611). During the suction process, the bag (622) balances the air pressure in the box through the connecting pipe (621). Step 3: Open the mode adjustment valve (67), close the delivery valve (64), and at the same time, the first motor (65) works in the forward direction. The rotating plug (613) rotates so that the notch (614) is periodically aligned with the drip hole. The lifting plug (615) is pressed down. Liquid formaldehyde is preheated when it passes through multiple drip tubes (63), and then intermittently and dispersedly dripped into different positions in the vessel body (1) through the mode adjustment valve (67). Step 4: The second motor (58) drives the stirring shaft (51), which in turn drives the stirring frame and stirring blades (56) to rotate to mix the raw materials for methyl acetal production. Step 5: After the raw materials for methyl acetal production are mixed, open the discharge valve (3) at the bottom of the reactor body (1) and the mixed material is discharged from the discharge valve (3).

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