A neutralization device for producing hydroxypropyl methylcellulose

Abstract

The utility model discloses a neutralization device for producing hydroxypropyl methylcellulose, comprising a reaction kettle barrel and a kettle cover clamped on the top of the reaction kettle barrel, a heating barrel is arranged below the reaction kettle barrel, and a discharge valve is fixedly connected below the heating barrel, when a hydrochloric acid solution flows into the inner cavity of the reaction kettle barrel through an addition pipe to neutralize with the hydroxypropyl methylcellulose, when the hydroxypropyl methylcellulose and the hydrochloric acid solution contact in the inner cavity of the reaction kettle barrel, a motor drives a rotating rod to rotate to stir the hydroxypropyl methylcellulose and the hydrochloric acid solution, so as to ensure that the hydroxypropyl methylcellulose can fully contact with the hydrochloric acid solution, adjust the pH of the hydroxypropyl methylcellulose slurry in the inner cavity of the reaction kettle barrel to be between 5 and 7, a material control valve transports the neutralized solution into the heating barrel, steam is added toward the interlayer of the heating barrel through a steam addition port, the heating barrel is heated, the temperature of the heating barrel rises to 50-55°C, the hydroxypropyl methylcellulose is fully reacted for 3 hours, and methylation of the alkali cellulose is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of hydroxypropyl methylcellulose, in particular to a neutralization device for producing hydroxypropyl methylcellulose. Background Art

[0002] Hydroxypropyl methylcellulose is a non-toxic, odorless, colorless, non-hygroscopic powder. It is a type of non-ionic cellulose mixed ether and a semi-synthetic, inactive, viscoelastic polymer. This compound is synthesized from cellulose through methylation and hydroxypropylation reactions, in which the hydroxypropyl group and methyl group can adjust its hydrolysis rate and thermal stability.

[0003] During the production process of hydroxypropyl methylcellulose, excessive acidity or alkalinity will have an adverse effect on product performance and the quality and stability of the final product cannot be guaranteed. Excessively high or low pH will also cause the risk of safety accidents.

[0004] Therefore, we propose a neutralization device for producing hydroxypropyl methylcellulose to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a neutralization device for producing hydroxypropyl methylcellulose to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a neutralization device for the production of hydroxypropyl methylcellulose, comprising a reaction kettle barrel and a kettle cover clamped on the top of the reaction kettle barrel, a heating barrel is provided below the reaction kettle barrel, and a discharge valve is fixedly connected below the heating barrel, and a motor is provided above the kettle cover;

[0007] The surface of the reactor barrel is fixedly connected with an addition pipe, and the surface of the reactor barrel is fixedly connected with a material feed port;

[0008] The top of the kettle cover is fixedly connected to a support frame, and a motor is mounted on the top of the support frame. The output end of the motor is fixedly connected to a rotating rod, and the rotating rod penetrates into the inner cavity of the reaction kettle barrel. A plurality of stirring rods are fixedly connected to the surface of the rotating rod.

[0009] Preferably, a detection gauge is fixedly connected to the surface of the kettle cover.

[0010] Preferably, a material control valve is fixedly connected to the inner wall of the reactor barrel, and the material control valve is located at the bottom of the inner cavity of the reactor barrel.

[0011] Preferably, an interlayer is provided inside the heating barrel, and a steam addition port and a condensed water discharge port are fixedly connected to the surface of the heating barrel.

[0012] Preferably, the surface of the heating barrel is coated with heat insulating material.

[0013] Preferably, the stirring rod is configured to be anchor-shaped.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] When the hydrochloric acid solution flows into the inner cavity of the reactor barrel through the addition tube to neutralize the hydroxypropyl methylcellulose, when the hydroxypropyl methylcellulose and the hydrochloric acid solution are in contact in the inner cavity of the reactor barrel, the motor drives the rotating rod to rotate to stir the hydroxypropyl methylcellulose and the hydrochloric acid solution to ensure that the hydroxypropyl methylcellulose can fully contact with the hydrochloric acid solution, and the pH of the hydroxypropyl methylcellulose slurry in the inner cavity of the reactor barrel is adjusted to between 5 and 7. The control valve conveys the neutralized solution to the heating barrel, and steam is added toward the interlayer of the heating barrel through the steam addition port to heat the heating barrel. The temperature of the heating barrel rises to 50-55° C., so that it fully reacts for 3 hours to achieve methylation of alkali cellulose. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model in front view section;

[0017] Figure 2 It is a structural schematic diagram of the utility model in a front view;

[0018] Figure 3 It is a schematic diagram of the structure of the heating barrel of the utility model in a top view.

[0019] In the figure: 1. Reactor barrel; 2. Kettle cover; 3. Heating barrel; 4. Test gauge; 5. Discharge valve; 6. Motor; 7. Adding pipe; 8. Material feed port; 9. Support frame; 10. Rotating rod; 11. Stirring rod; 12. Material control valve; 13. Steam adding port; 14. Condensate discharge port. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-3The utility model provides a technical solution: a neutralization device for producing hydroxypropyl methylcellulose, comprising a reactor barrel 1 and a reactor cover 2 clamped on the top of the reactor barrel 1, hydroxypropyl methylcellulose material is injected into the inner cavity of the reactor barrel 1 through a material feed port 8, and hydrochloric acid is added through an addition tube 7 according to the weight of the hydroxypropyl methylcellulose, when the hydrochloric acid solution flows into the inner cavity of the reactor barrel 1 through the addition tube 7 to neutralize the hydroxypropyl methylcellulose, the top of the reactor cover 2 is fixedly connected to a support frame 9 to support a motor 6, when the hydroxypropyl methylcellulose and the hydrochloric acid solution are in contact in the inner cavity of the reactor barrel 1, the motor 6 is started to drive the rotating rod 10 to rotate to stir the hydroxypropyl methylcellulose and the hydrochloric acid solution, so as to ensure that the hydroxypropyl methylcellulose can fully contact with the hydrochloric acid solution, and adjust the pH of the hydroxypropyl methylcellulose slurry in the inner cavity of the reactor barrel 1 to be between 5 and 7.

[0022] See also Figure 1-3 The control valve 12 delivers the neutralized solution to the heating barrel 3, and the steam adding port 13 is used to add steam into the interlayer of the heating barrel 3 to heat the heating barrel 3. The temperature of the heating barrel 3 rises to 50-55°C to allow it to fully react for 3 hours to achieve methylation of the alkali cellulose. The condensed water after processing is discharged to the outside through the condensed water discharge port 14, and the hydroxypropyl methyl fiber after processing is discharged to the outside through the discharge valve 5.

[0023] See also Figure 1-3 , the detection table 4 detects the cavity formed by the reactor barrel 1 and the reactor cover 2, and detects the internal pressure and temperature at all times. The reactor barrel 11 is set in an anchor shape, and the stirring rod 11 is large in size and has a low rotation speed. When rotating, the gap with the inner wall of the reactor barrel 1 is small, which prevents the material from coking on the wall and improves heat exchange.

[0024] Working principle: Hydroxypropyl methylcellulose material is injected into the inner cavity of the reactor barrel 1 through the material feed port 8, and hydrochloric acid is added through the adding tube 7 according to the weight of the hydroxypropyl methylcellulose. When the hydrochloric acid solution flows into the inner cavity of the reactor barrel 1 through the adding tube 7 to neutralize the hydroxypropyl methylcellulose, the top of the reactor cover 2 is fixedly connected to the support frame 9 to support the motor 6. When the hydroxypropyl methylcellulose and the hydrochloric acid solution are in contact in the inner cavity of the reactor barrel 1, the motor 6 is started to drive the rotating rod 10 to rotate to stir the hydroxypropyl methylcellulose and the hydrochloric acid solution to ensure that the hydroxypropyl methylcellulose can fully contact with the hydrochloric acid solution, and the hydroxypropyl methylcellulose slurry P in the inner cavity of the reactor barrel 1 is adjusted. H is between 5 and 7, the control valve 12 delivers the neutralized solution to the heating barrel 3, and uses the steam adding port 13 to add steam to the interlayer of the heating barrel 3 to heat the heating barrel 3. The temperature of the heating barrel 3 rises to 50-55°C, so that it fully reacts for 3 hours to achieve methylation of alkali cellulose. The condensed water after processing is discharged to the outside through the condensed water discharge port 14, and the hydroxypropyl methyl fiber after processing is discharged to the outside through the discharge valve 5. The detection table 4 detects the cavity formed by the reactor barrel 1 and the kettle cover 2, and detects the internal pressure and temperature at all times. The reactor barrel 11 is set to an anchor shape, and the stirring rod 11 is large in size and has a low rotation speed. When rotating, the gap with the inner wall of the reactor barrel 1 is small, which prevents the material from coking on the wall, improves heat exchange, and solves the problem that excessive acidity or alkali has an adverse effect on product performance in the production process of hydroxypropyl methylcellulose, and the quality and stability of the final product cannot be guaranteed, and the risk of safety accidents caused by excessively high or low pH.

[0025] Although 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 neutralization device for producing hydroxypropyl methylcellulose, comprising a reaction kettle barrel (1) and a kettle cover (2) clamped on the top of the reaction kettle barrel (1), characterized in that: A heating barrel (3) is provided below the reaction kettle barrel (1), and a discharge valve (5) is fixedly connected below the heating barrel (3), and a motor (6) is provided above the kettle cover (2); The surface of the reactor barrel (1) is fixedly connected to an addition pipe (7), and the surface of the reactor barrel (1) is fixedly connected to a material feed port (8); The top of the kettle cover (2) is fixedly connected to a support frame (9), and the motor (6) is mounted on the top of the support frame (9). The output end of the motor (6) is fixedly connected to a rotating rod (10), and the rotating rod (10) penetrates into the inner cavity of the reaction kettle barrel (1), and a plurality of stirring rods (11) are fixedly connected to the surface of the rotating rod (10).

2. A neutralization device for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: A detection gauge (4) is fixedly connected to the surface of the kettle cover (2).

3. A neutralization device for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: A material control valve (12) is fixedly connected to the inner wall of the reaction kettle barrel (1), and the material control valve (12) is located at the bottom of the inner cavity of the reaction kettle barrel (1).

4. A neutralization device for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: The heating barrel (3) is provided with an interlayer inside, and a steam addition port (13) and a condensed water discharge port (14) are fixedly connected to the surface of the heating barrel (3).

5. A neutralization device for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: The surface of the heating barrel (3) is coated with heat insulating material.

6. A neutralization device for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: The stirring rod (11) is arranged in an anchor shape.

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