Neutralization kettle for neutralizing, separating and purifying hydroxypropyl methyl cellulose

Abstract

The invention relates to the technical field of hydroxypropyl methyl cellulose neutralization, in particular to a neutralization kettle for neutralization, separation and purification of hydroxypropyl methyl cellulose, which comprises a neutralization kettle, the top of which is provided with an opening; the supporting legs are fixed at the bottom of the neutralization kettle; the driving part is mounted on the top surface of the neutralization kettle; the stirring structure is arranged in the neutralization kettle; the neutralizer filling structure is arranged on the top surface of the neutralization kettle; the control structure is arranged on the stirring structure; and the lifting structure is arranged on the neutralization kettle. Compared with the prior art, through the design that the through holes are uniformly distributed in the stirring shaft, it is ensured that the neutralizer can be uniformly distributed in the height direction of the solution, concentration gradient of the neutralizer in the vertical direction is avoided, full contact and reaction of the neutralizer and the hydroxypropyl methyl cellulose solution are promoted, and the neutralizer can be uniformly stirred. And the uniformity and efficiency of the neutralization reaction are improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydroxypropyl methylcellulose neutralization, in particular to a neutralization kettle for neutralizing, separating and purifying hydroxypropyl methylcellulose. Background Art

[0002] The neutralization kettle used in the neutralization, separation and purification process of hydroxypropyl methylcellulose (HPMC) is one of the important equipment for the production of HPMC. The neutralization kettle is mainly used in the neutralization reaction stage in the HPMC production process. By adding a neutralizer to react with the acidic HPMC precursor, the pH value of the solution is adjusted to make the HPMC reach the required pH value and promote the precipitation and purification of HPMC. The neutralization kettle is usually composed of a tank body, a stirring device, a heating / cooling system, a feed / discharge port, a gas exhaust system and other parts.

[0003] After searching, the Chinese patent with the announcement number CN213966210U discloses an alkaline water agent neutralization kettle, comprising: a neutralization kettle, a neutralization inner box, an alkaline water agent raw material box and a support frame, the neutralization kettle and the alkaline water agent raw material box are installed on the support frame, the neutralization inner box is installed in the neutralization kettle, the alkaline water agent raw material box is connected to the neutralization kettle through a quantitative feeding structure, and a stirring structure and a filtering structure are installed in the neutralization kettle; the above scheme uniformly mixes the liquid in the neutralization kettle with the alkaline water agent through the stirring structure, filters the solid matter generated in the neutralization process through the filtering structure, guides the liquid into the neutralization kettle, and quantitatively pushes the alkaline water agent to the neutralization kettle through the quantitative feeding structure, so as to achieve stable neutralization of the liquid in the neutralization kettle. However, the above scheme still has the following shortcomings when actually used:

[0004] When adding the neutralizer to the neutralization kettle proposed in the above scheme, the staff usually pours the neutralizer directly into the neutralization kettle, so that the neutralizer gradually diffuses downward and is fully mixed with the stock solution in the neutralization kettle under the stirring action of the agitator. For this adding method, directly pouring the neutralizer will cause the neutralizer to be extremely unevenly distributed in the neutralization kettle. The neutralizer is first mixed with the stock solution at the top, and the stock solution at the bottom is difficult to quickly mix with the neutralizer due to gravity and insufficient stirring, resulting in a concentration gradient of the neutralizer in the vertical direction. Due to the uneven distribution of the neutralizer, the reaction rate of the stock solution at the bottom with the neutralizer will be significantly slower than that at the top, resulting in low overall reaction efficiency, which not only prolongs the reaction time, but may also affect the quality and output of the product. In addition, in order to compensate for the problem of uneven distribution of the neutralizer, it may be necessary to increase the speed of the agitator or extend the stirring time, thereby increasing energy consumption.

[0005] Therefore, the present application provides a neutralization kettle for neutralizing, separating and purifying hydroxypropyl methylcellulose. Summary of the invention

[0006] In view of this, the object of the present invention is to provide a neutralization kettle for neutralizing, separating and purifying hydroxypropyl methylcellulose.

[0007] Based on the above purpose, the present invention provides a neutralization kettle for neutralizing, separating and purifying hydroxypropyl methylcellulose, comprising:

[0008] A neutralization kettle having an opening on the top;

[0009] A support leg fixed to the bottom of the neutralization kettle;

[0010] A driving member, mounted on the top surface of the neutralization kettle;

[0011] A stirring structure is arranged inside the neutralization kettle;

[0012] A neutralizer filling structure is arranged on the top surface of the neutralization kettle;

[0013] A control structure, disposed on the stirring structure;

[0014] The lifting structure is arranged on the neutralization kettle.

[0015] Preferably, the stirring structure comprises:

[0016] A stirring shaft passes through the opening and is rotatably installed in the opening, the interior of the stirring shaft is a hollow structure, and a through opening is opened at the top of the stirring shaft;

[0017] A plurality of stirring arms, one end of each of which is fixedly connected to the stirring shaft;

[0018] A plurality of stirring blades are respectively fixed to one end of a plurality of stirring arms away from the stirring shaft;

[0019] A plurality of through holes are provided on the outer surface of the stirring shaft, and each of the through holes is connected to the interior of the stirring shaft;

[0020] A transmission member is provided, wherein the top end of the stirring shaft is connected to the output shaft of the driving member through the transmission member.

[0021] Preferably, the neutralizer filling structure comprises:

[0022] A bracket, fixed on the top surface of the neutralization kettle;

[0023] A sealing cylinder is fixed on the bracket and has a hole at one end;

[0024] A sliding plug, sealingly and slidingly connected to the inner surface of the sealing cylinder;

[0025] A spring, one end of which is connected to the inner surface of the sealing cylinder, and the other end of which is connected to the sliding plug;

[0026] A connecting rod, one end of which is fixedly connected to the sliding plug, and the other end of which passes through the hole and extends to the outside of the sealing cylinder;

[0027] An eccentric wheel, fixedly sleeved on the output shaft of the driving member;

[0028] Two installation tubes, one end of each of which is connected to the sealing cylinder;

[0029] Two one-way valves are respectively installed on the two installation pipes;

[0030] A rotary joint is installed at the bottom end of the stirring shaft and is connected to the interior of the stirring shaft, wherein one end of one of the installation tubes away from the sealing cylinder is connected to the rotary joint.

[0031] Preferably, the control structure comprises:

[0032] A slider is slidably connected to the inside of the stirring shaft, and the outer surface of the slider is in contact with the inner surface of the stirring shaft;

[0033] A first connecting rope passes through the through hole and slides in the through hole;

[0034] A fixed block, fixed to one end of the first connecting rope located inside the stirring shaft;

[0035] A groove is provided on the bottom surface of the fixing block;

[0036] A rotating block, rotatably disposed in the groove;

[0037] A second connecting rope has one end fixedly connected to the sliding block, and the other end fixedly connected to the rotating block.

[0038] Preferably, the cross-sections of the groove and the rotating block are both T-shaped structures.

[0039] Preferably, the lifting structure comprises:

[0040] Two side plates are fixed on the sides of the neutralization kettle and are arranged vertically opposite to each other;

[0041] A screw rod is rotatably mounted between the two side plates;

[0042] A guide rod, fixed between the two side plates;

[0043] The lifting block is threadedly sleeved on the screw rod and slidably sleeved on the guide rod. The lifting block is connected to an end of the first connecting rope away from the fixed block.

[0044] Preferably, a fixing frame is fixed on the top surface of the neutralization kettle, and the fixing frame is in a U-shaped structure. A plurality of pulleys are installed on the fixing frame, and the first connecting rope passes around the plurality of pulleys.

[0045] Preferably, a storage tank is provided on the supporting leg, and the top of the storage tank is open, and the storage tank is fixed on the supporting leg by two cross bars.

[0046] Preferably, a hand wheel is installed at the top end of the screw rod.

[0047] Preferably, the plurality of through holes are evenly distributed on the stirring shaft.

[0048] Beneficial effects of the present invention:

[0049] 1. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose has a uniformly distributed through-hole design on the stirring shaft, which ensures that the neutralizer can be evenly distributed in the height direction of the solution, avoids the concentration gradient of the neutralizer in the vertical direction, promotes the full contact and reaction between the neutralizer and the hydroxypropyl methylcellulose solution, and improves the uniformity and efficiency of the neutralization reaction. Since the neutralizer can be quickly and evenly dispersed in the solution and fully mixed with the hydroxypropyl methylcellulose, the neutralization reaction is accelerated, the reaction time is shortened, and the production efficiency is improved;

[0050] 2. In the neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose, the reciprocating movement of the sliding plug not only pumps the neutralizer, but also forms bubbles in the solution through the action of the one-way valve. The rise and burst of these bubbles provide an aeration effect for the solution, further promoting the exchange and mixing of substances in the solution and improving the efficiency of the neutralization reaction;

[0051] 3. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose can ensure that the neutralizer or gas flows out only through the through-holes located inside the solution by adjusting the position of the slider inside the stirring shaft to make it flush with the liquid level of the hydroxypropyl methylcellulose solution. This precise control avoids the neutralizer or gas from being released directly above the solution, thereby reducing its useless diffusion in the air, improving the utilization rate of the neutralizer in the solution, and thus accelerating the rate of the neutralization reaction. Since the neutralizer or gas is released only through the through-holes inside the solution, they can be more directly and evenly distributed in the solution. This design avoids the formation of a local high concentration area of ​​the neutralizer in the solution, reduces the problems caused by uneven mixing, and ensures the uniformity and consistency of the neutralization reaction;

[0052] 4. The control structure and the lifting structure of the neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose enable the operator to flexibly adjust the position of the slider according to actual conditions. No matter how the liquid level of the solution changes, the relative position of the slider and the liquid level can be maintained by adjusting the slider, thereby maintaining the stability and efficiency of the neutralization process. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0055] Figure 2 It is a structural schematic diagram of another perspective of the present invention;

[0056] Figure 3 is a schematic diagram of the structure of the stirring structure;

[0057] Figure 4 Schematic diagram of the cross-sectional structure of the stirring shaft;

[0058] Figure 5 It is a schematic cross-sectional view of the neutralization kettle;

[0059] Figure 6 for Figure 1 A magnified view of the structure at A;

[0060] Figure 7 for Figure 2 A magnified view of the structure at B;

[0061] Figure 8 for Figure 3 A magnified view of the structure at C;

[0062] Fig. 9 for Figure 4 A magnified view of the structure at D;

[0063] Fig.10 for Figure 5 Enlarged view of the structure at E.

[0064] The markings in the figure are:

[0065] 1. Neutralization kettle; 2. Support legs; 3. Driving member; 41. Stirring shaft; 42. Stirring arm; 43. Stirring blade; 44. Through hole; 45. Transmission member; 51. Bracket; 52. Sealing cylinder; 53. Sliding plug; 54. Spring; 55. Connecting rod; 56. Eccentric wheel; 57. Mounting pipe; 58. One-way valve; 59. Rotary joint; 61. Sliding block; 62. First connecting rope; 63. Fixed block; 64. Groove; 65. Rotating block; 66. Second connecting rope; 71. Side plate; 72. Screw rod; 73. Guide rod; 74. Lifting block; 8. Fixed frame; 9. Pulley; 10. Storage tank; 11. Cross bar. DETAILED DESCRIPTION

[0066] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0067] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0068] like Figures 1 to 10 As shown, the neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose comprises a neutralization kettle 1, which has an opening on the top; a support leg 2, which is fixed to the bottom of the neutralization kettle 1; and a driving member 3, which is installed on the top surface of the neutralization kettle 1. When the neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose proposed by the present invention is used, the staff injects the hydroxypropyl methylcellulose solution into the interior of the neutralization kettle 1;

[0069] like Figure 3 , Figure 8 As shown, the neutralization kettle also includes a stirring structure, which is arranged inside the neutralization kettle 1, and the stirring structure includes: a stirring shaft 41, which passes through the opening and is rotatably installed in the opening, the interior of the stirring shaft 41 is a hollow structure, and the top of the stirring shaft 41 is provided with a through hole; a plurality of stirring arms 42, one end of which is fixedly connected to the stirring shaft 41; a plurality of stirring blades 43, which are respectively fixed to the ends of the plurality of stirring arms 42 away from the stirring shaft 41; a plurality of through holes 44, which are all opened on the outer surface of the stirring shaft 41, each of which is connected to the inside of the stirring shaft 41, and the plurality of through holes 44 are evenly distributed on the stirring shaft 41; a transmission member 45, the top of the stirring shaft 41 is connected to the output shaft of the driving member 3 through the transmission member 45;

[0070] like Figure 5 , Figure 7 , Fig.10As shown, the neutralization kettle also includes a neutralizer filling structure, which is arranged on the top surface of the neutralization kettle 1, and the neutralizer filling structure includes: a bracket 51, which is fixed on the top surface of the neutralization kettle 1; a sealing cylinder 52, which is fixed on the bracket 51 and has a hole at one end; a sliding plug 53, which is sealingly and slidably connected to the inner surface of the sealing cylinder 52; a spring 54, one end of which is connected to the inner surface of the sealing cylinder 52 and the other end is connected to the sliding plug 53; a connecting rod 55, one end of which is fixedly connected to the sliding plug 53 and the other end extends to the outside of the sealing cylinder 52 through the hole; an eccentric wheel 56, which is fixedly sleeved on the output shaft of the driving member 3; two mounting tubes 57, one end of which is connected to the sealing cylinder 52; two one-way valves 58, which are respectively mounted on the two mounting tubes 57; a rotary joint 59, which is mounted on the bottom end of the stirring shaft 41 and is connected to the inside of the stirring shaft 41, and one end of one of the mounting tubes 57 away from the sealing cylinder 52 is connected to the rotary joint 59;

[0071] The staff adjusts the sliding plug 53 to one end of the sealing cylinder 52 near the eccentric wheel 56, and injects the neutralizing agent into the sealing cylinder 52. When the hydroxypropyl methylcellulose solution is neutralized, the staff starts the driving member 3. The driving member 3 is composed of a motor and a reducer. The output end of the motor is connected to the input end of the reducer. The output shaft of the reducer is connected to the stirring shaft 41 through a transmission member 45. Therefore, when the driving member 3 is running, the stirring shaft 41 can be driven to rotate through the transmission member 45. When the stirring shaft 41 rotates, it can drive the plurality of stirring blades 43 to rotate through the plurality of stirring arms 42. The plurality of stirring blades 43 can stir the hydroxypropyl methylcellulose solution in the neutralization kettle 1 during the rotation process. In addition, the output shaft of the driving member 3 can also drive the eccentric wheel 56 to rotate. When the eccentric wheel 56 rotates, it can squeeze the connecting rod 55, so that the connecting rod 55 drives the sliding plug 53 to move. When the sliding plug 53 moves, it can press the neutralizer in the sealing cylinder 52 into the interior of the stirring shaft 41 through the corresponding mounting tube 57, so that the neutralizer flows out through the plurality of through holes 44 on the stirring shaft 41. Since the plurality of through holes 44 are evenly distributed on the stirring shaft 41, the neutralizer can be evenly distributed in the height direction of the neutralization kettle 1, which makes the neutralizer and the hydroxypropyl methylcellulose solution fully mixed. At the same time, with the stirring effect of the plurality of stirring blades 43, the neutralizer and the hydroxypropyl methylcellulose solution can be quickly and evenly mixed.

[0072] The eccentric wheel 56 will continuously squeeze the connecting rod 55 during its rotation. When the eccentric wheel 56 squeezes the connecting rod 55, the connecting rod 55 can drive the sliding plug 53 to move, so that the sliding plug 53 squeezes the spring 54. When the eccentric wheel 56 is separated from the connecting rod 55, the sliding plug 53 will be reset under the elastic force of the spring 54. Therefore, with the rotation of the eccentric wheel 56, the sliding plug 53 will reciprocate inside the sealing tube 52. Since the flow limiting directions of the two one-way valves 58 are opposite, specifically, one of the one-way valves 58 limits the gas or gas to only enter the interior of the sealing tube 52, and the other one-way valve 58 limits the gas or liquid to only flow out of the sealing tube 52. Therefore, when the sliding plug 53 moves toward one end of the sealing tube 52, the sliding plug 53 can press the gas or liquid in the sealing tube 52 out. When the sliding plug 53 moves toward the other end of the sealing tube 52, the sliding plug 53 can pass through the corresponding installation tube. 57 extracts gas or liquid. Based on the above process, when the slide plug 53 presses the neutralizer in the sealing tube 52 into the interior of the stirring shaft 41, the subsequent reciprocating movement of the slide plug 53 can continuously perform the action of pumping and exhausting, and continuously pump gas into the interior of the stirring shaft 41. Further, the gas will be ejected through a plurality of through holes 44, and form bubbles that continuously surge upward in the hydroxypropyl methylcellulose solution in the neutralization kettle 1. The formation of bubbles can provide aeration for the hydroxypropyl methylcellulose solution, and also play a role in stirring and mixing the hydroxypropyl methylcellulose solution and the neutralizer, thereby increasing the mixing speed between the two. It is worth mentioning that a rotary joint 59 is installed at the bottom end of the stirring shaft 41. The design of the rotary joint 59 enables relative rotation between the stirring shaft 41 and the mounting tube 57, thereby preventing the mounting tube 57 from being entangled on the stirring shaft 41 during the rotation of the stirring shaft 41, thereby ensuring the smooth operation of the device.

[0073] A storage tank 10 is provided on the support leg 2, and the top of the storage tank 10 is open. The storage tank 10 is fixed to the support leg 2 by two cross bars 11. When the hydroxypropyl methylcellulose solution is neutralized, the staff injects the neutralizer into the storage tank 10. When it is necessary to continue to add the neutralizer to the hydroxypropyl methylcellulose solution, the staff can insert the installation tube 57 for extraction into the storage tank 10, so that the reciprocating sliding plug 53 continuously extracts the neutralizer in the storage tank 10 and injects the neutralizer into the interior of the stirring shaft 41, thereby realizing the continuous addition of the neutralizer;

[0074] like Figure 4 , Fig. 9As shown, the neutralization kettle also includes a control structure, which is arranged on the stirring structure, and the control structure includes: a slider 61, which is slidably connected to the inside of the stirring shaft 41, and the outer surface of the slider 61 and the inner surface of the stirring shaft 41 are mutually fitted; a first connecting rope 62 passes through the through hole and slides in the through hole; a fixed block 63 is fixed to one end of the first connecting rope 62 located inside the stirring shaft 41; a groove 64 is opened on the bottom surface of the fixed block 63; a rotating block 65 is rotatably arranged in the groove 64, and the cross-sections of the groove 64 and the rotating block 65 are both T-shaped structures; a second connecting rope 66, one end of which is fixedly connected to the slider 61, and the other end is fixedly connected to the rotating block 65;

[0075] like Figure 2 , Figure 6 As shown, the neutralization kettle also includes a lifting structure, which is arranged on the neutralization kettle 1, and the lifting structure includes: two side plates 71, both fixed to the side of the neutralization kettle 1, and arranged vertically opposite to each other; a screw rod 72, rotatably installed between the two side plates 71, and a hand wheel is installed on the top of the screw rod 72; a guide rod 73, fixed between the two side plates 71; a lifting block 74, which is threadedly sleeved on the screw rod 72 and slidably sleeved on the guide rod 73, and the lifting block 74 is connected to the end of the first connecting rope 62 away from the fixed block 63, and a fixing frame 8 is fixed on the top surface of the neutralization kettle 1, and the fixing frame 8 is a U-shaped structure, and a plurality of pulleys 9 are installed on the fixing frame 8, and the first connecting rope 62 passes around the plurality of pulleys 9;

[0076] The hydroxypropyl methylcellulose neutralization device is also provided with a control structure and a lifting structure. For the control structure and the lifting structure, the staff can adjust the position of the slider 61 inside the stirring shaft 41 according to the height of the liquid level in the neutralization kettle 1, so that the slider 61 is flush with the liquid level of the hydroxypropyl methylcellulose solution. In this case, the gas or neutralizer cannot flow out through the through hole 44 located above the slider 61, and can only flow out through the through hole 44 located inside the hydroxypropyl methylcellulose solution. This design can ensure the uniform distribution of the gas or neutralizer in the hydroxypropyl methylcellulose solution. When adjusting the position of the slider 61, the staff turns the hand wheel on the screw rod 72 to rotate the screw rod 72. Under the limiting action of the guide rod 73, the screw rod 72 can drive the lifting block 74 to move up and down when it rotates. When the lifting block 74 moves downward, the lifting block 74 can pull the first connecting rope 62, and the first connecting rope 62 can pass through the fixed block 63. The second connecting rope 66 is pulled by the rotating block 65, so that the second connecting rope 66 pulls the slider 61. When the lifting block 74 moves upward, the lifting block 74 no longer applies tension to the slider 61 through the first connecting rope 62 and the second connecting rope 66. At this time, the slider 61 will move downward under the action of gravity. In summary, the staff can adjust the position of the slider 61 in the stirring shaft 41 by rotating the screw rod 72. It should be noted that a groove 64 is provided on the fixed block 63, and the rotating block 65 is rotatably installed in the groove 64, which allows relative rotation between the fixed block 63 and the rotating block 65. This design can prevent the rotating stirring shaft 41 from causing the first connecting rope 62 and the second connecting rope 66 to be entangled. When the stirring shaft 41 rotates, the first connecting rope 62 and the second connecting rope 66 can remain stationary. In addition, the cross-sections of the groove 64 and the rotating block 65 are both T-shaped structures, which can prevent the rotating block 65 from falling off from the groove 64.

[0077] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0078] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose, characterized in that: include: A neutralization kettle (1) having an opening at the top; A support leg (2) fixed to the bottom of the neutralization kettle (1); A driving member (3) is mounted on the top surface of the neutralization kettle (1); A stirring structure is arranged inside the neutralization kettle (1); A neutralizing agent filling structure is arranged on the top surface of the neutralization kettle (1); A control structure, disposed on the stirring structure; The lifting structure is arranged on the neutralization kettle (1).

2. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose according to claim 1, characterized in that: The stirring structure comprises: A stirring shaft (41) passes through the opening and is rotatably installed in the opening. The interior of the stirring shaft (41) is a hollow structure, and a through opening is formed at the top of the stirring shaft (41); A plurality of stirring arms (42), one end of each of which is fixedly connected to the stirring shaft (41); A plurality of stirring blades (43) are respectively fixed to one end of the plurality of stirring arms (42) away from the stirring shaft (41); A plurality of through holes (44) are provided on the outer surface of the stirring shaft (41), and each of the through holes (44) is connected to the interior of the stirring shaft (41); A transmission member (45), wherein the top end of the stirring shaft (41) is connected to the output shaft of the driving member (3) by means of the transmission member (45).

3. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose according to claim 2, characterized in that: The neutralizer filling structure comprises: A bracket (51) fixed on the top surface of the neutralization kettle (1); A sealing cylinder (52) is fixed on the bracket (51) and has a hole at one end; A sliding plug (53) is sealingly and slidingly connected to the inner surface of the sealing cylinder (52); A spring (54), one end of which is connected to the inner surface of the sealing cylinder (52), and the other end of which is connected to the sliding plug (53); A connecting rod (55), one end of which is fixedly connected to the sliding plug (53), and the other end of which passes through the hole and extends to the outside of the sealing cylinder (52); An eccentric wheel (56) is fixedly sleeved on the output shaft of the driving member (3); Two installation tubes (57), one end of each of which is connected to the sealing cylinder (52); Two one-way valves (58) are respectively installed on the two installation pipes (57); A rotary joint (59) is installed at the bottom end of the stirring shaft (41) and is connected to the interior of the stirring shaft (41), wherein one end of one of the mounting tubes (57) away from the sealing cylinder (52) is connected to the rotary joint (59).

4. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose according to claim 3, characterized in that: The control structure includes: A slider (61) is slidably connected to the inside of the stirring shaft (41), and the outer surface of the slider (61) and the inner surface of the stirring shaft (41) are in contact with each other; A first connecting rope (62) passes through the through hole and slides inside the through hole; A fixing block (63) fixed to one end of the first connecting rope (62) located inside the stirring shaft (41); A groove (64) is provided on the bottom surface of the fixing block (63); A rotating block (65) rotatably disposed in the groove (64); A second connecting rope (66) has one end fixedly connected to the sliding block (61) and the other end fixedly connected to the rotating block (65).

5. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose according to claim 4, characterized in that: The cross sections of the groove (64) and the rotating block (65) are both T-shaped structures.

6. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose according to claim 4, characterized in that: The lifting structure comprises: Two side plates (71) are fixed on the sides of the neutralization kettle (1) and are arranged vertically opposite to each other; A screw rod (72) is rotatably mounted between the two side plates (71); A guide rod (73) fixed between the two side plates (71); The lifting block (74) is threadedly sleeved on the screw rod (72) and slidably sleeved on the guide rod (73). The lifting block (74) is connected to an end of the first connecting rope (62) away from the fixed block (63).

7. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose according to claim 4, characterized in that: A fixing frame (8) is fixed on the top surface of the neutralization kettle (1), and the fixing frame (8) is in a U-shaped structure. A plurality of pulleys (9) are installed on the fixing frame (8), and the first connecting rope (62) passes around the plurality of pulleys (9).

8. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose according to any one of claims 1 to 7, characterized in that: A storage tank (10) is provided on the supporting leg (2), and the top end of the storage tank (10) is open. The storage tank (10) is fixed on the supporting leg (2) via two cross bars (11).

9. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose according to claim 6, characterized in that: A hand wheel is installed at the top end of the screw rod (72).

10. The neutralization kettle for neutralization, separation and purification of hydroxypropyl methylcellulose according to claim 2, characterized in that: The plurality of through holes (44) are evenly distributed on the stirring shaft (41).

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