Drying and surface treatment integrated device for cellulose ether and derivatives thereof

Abstract

The utility model belongs to the technical field of high polymer material modification, and particularly relates to a drying and surface treatment integrated device for cellulose ether and derivatives thereof, which comprises a vacuum rake dryer, a drying bin and a hollow cylinder, a vacuumizing port and a nitrogen back flushing port are arranged on the outer side of the hollow cylinder, and the vacuumizing port is connected with a vacuumizing system; one end of the conveying pipeline extends into the hollow cylinder through the nitrogen back flushing opening, the other end of the conveying pipeline is divided into two branches, the first branch is connected with a nitrogen supply system, and the second branch is connected with a glyoxal supply system; and the atomizing nozzle is mounted at one end, extending into the hollow cylinder, of the conveying pipeline. Surface treatment is carried out in the raking machine, the use efficiency of the reaction kettle is improved, glyoxal is not added into a reaction solvent, the solvent recovery treatment difficulty is reduced, the glyoxal is atomized, the surface treatment reaction efficiency is improved, the glyoxal use amount is reduced, raw material waste is avoided, the production cost is reduced, and the industrial production is facilitated. And the environmental pollution risk is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of polymer material modification technology, specifically relating to an integrated device for drying and surface treatment of cellulose ethers and their derivatives. Background Technology

[0002] Cellulose ethers and their derivatives are an important class of functional polymer materials, widely used in pharmaceuticals, food, daily chemicals and oil extraction. Optimizing their performance and improving production efficiency have always been the core needs of the industry's technological development.

[0003] In existing production processes, in-situ surface treatment within a reactor is commonly used. The process mainly includes: first, adding the reaction solvent to the reactor, then adding cellulose raw materials to the reactor to form a mixture, and then adding other reactants to carry out the reaction; after the reaction is completed, adding glyoxal to the reaction solution for surface treatment; then centrifuging to separate the reaction solvent, and recovering the reaction solvent by distillation or rectification; finally, transferring the wet material containing a small amount of solvent to a vacuum rake dryer for drying to obtain the target product.

[0004] However, the aforementioned traditional process has the following technical drawbacks:

[0005] 1. High difficulty in solvent recovery: Glyoxal is directly added to the system containing the reaction solvent as a surface treatment agent, which leads to the formation of a mixed system between the solvent and glyoxal. This makes it difficult to achieve efficient separation and purification of the solvent, thereby increasing the difficulty of solvent recovery and affecting its recycling value.

[0006] Second, surface treatment is inefficient and costly: Because the surface treatment steps are carried out in a reaction solution containing a large amount of reaction solvent (usually 6-10 times the mass of the material), the probability of effective collision between glyoxal molecules and cellulose materials is significantly reduced. Therefore, to achieve the desired surface modification effect, excessive amounts must be used, which not only wastes raw materials and significantly increases production costs, but also exacerbates the risk of environmental pollution. In addition, as a toxic and harmful substance, the excessive use of glyoxal further increases the difficulty of safety management in the production process and occupational health risks. Utility Model Content

[0007] The purpose of this invention is to provide an integrated device for drying and surface treatment of cellulose ethers and their derivatives, which solves the technical problems of difficult solvent recovery, low surface treatment efficiency, resource waste and high environmental risk in the prior art.

[0008] This utility model discloses an integrated device for drying and surface treatment of cellulose ethers and their derivatives, comprising:

[0009] A vacuum rake dryer includes a drying chamber and a hollow cylinder. The hollow cylinder is vertically installed at the top of the drying chamber, and the outer side of the hollow cylinder is provided with a vacuum port and a nitrogen backflush port. The vacuum port is connected to a vacuum system.

[0010] The delivery pipeline extends into the hollow cylinder through the nitrogen backflush port at one end, and splits into two branches at the other end. The first branch is connected to the nitrogen supply system, and the second branch is connected to the glyoxal supply system.

[0011] An atomizing nozzle is installed at one end of the delivery pipeline that extends into the hollow cylinder.

[0012] This application modifies the surface treatment container for cellulose ethers and their derivatives from a reaction vessel to a rake dryer by modifying the nitrogen backflush port, thereby improving the efficiency of the reaction vessel. Furthermore, it eliminates the need to add glyoxal to the reaction solvent, thus reducing the difficulty of subsequent solvent recovery and treatment. Additionally, it uses a spray method to allow glyoxal to directly contact the material, thereby improving the reaction efficiency of surface treatment and significantly reducing the amount of glyoxal used, avoiding raw material waste, reducing production costs, and minimizing environmental pollution risks, safety management difficulties, and occupational health risks.

[0013] Based on the above technical solution, the solution of this application can be further improved as follows:

[0014] Preferably, the delivery pipeline includes:

[0015] An input tube, one end of which extends into the hollow cylinder and is equipped with the atomizing nozzle;

[0016] The Y-type connector has an output end that can be detachably connected to the other end of the input pipe. One input end is connected to the nitrogen supply system, and the other input end is connected to the glyoxal supply system. This solution simplifies the installation process, reduces installation difficulty and cost, and facilitates maintenance or replacement through detachable connection, thereby improving maintenance efficiency and reducing downtime.

[0017] Preferably, the vacuum rake dryer includes:

[0018] An outer sleeve is installed on the outside of the hollow cylinder and fitted over the inlet pipe;

[0019] The sealing cap is detachably installed at the end of the outer sleeve away from the hollow cylinder and fixedly sleeved on the outside of the input pipe. This solution not only provides a sealing function to prevent leakage of internal media such as nitrogen and glyoxal, but also fixes and supports the input pipe, ensuring the accurate position of the atomizing nozzle, guaranteeing the surface treatment effect, and improving the convenience of maintenance, making it easy to inspect, repair or replace the atomizing nozzle.

[0020] Preferably, the delivery pipeline includes:

[0021] A one-way valve is connected in series between one input end of the Y-type connector and the nitrogen supply system. This solution can effectively prevent nitrogen and glyoxal from flowing back into the nitrogen supply system, thereby avoiding impact and damage to the nitrogen supply system, and also ensuring the stability of the flow direction of the medium in the pipeline.

[0022] Preferably, the delivery pipeline includes:

[0023] A switching valve is connected in series between the other input terminal of the Y-type connector and the glyoxal supply system. This solution can control the on / off supply of glyoxal, thereby playing a role in the start-up, shutdown, maintenance, and response to abnormalities of the device, and improving the safety of the device.

[0024] Preferably, the glyoxal supply system includes:

[0025] Glyoxal storage tank;

[0026] The peristaltic pump has its input end connected to the glyoxal storage tank via a pipeline, and its output end connected to the second branch of the delivery pipeline via a pipeline. This design ensures that glyoxal can be delivered in sufficient and stable quantities, thus improving the stability of the device's operation.

[0027] Through the above technical solution, this utility model achieves the following beneficial effects:

[0028] This application modifies the surface treatment container for cellulose ethers and their derivatives from a reaction vessel to a rake dryer by modifying the nitrogen backflush port, thereby improving the efficiency of the reaction vessel. Furthermore, it eliminates the need to add glyoxal to the reaction solvent, thus reducing the difficulty of subsequent solvent recovery and treatment. Additionally, it uses a spray method to allow glyoxal to directly contact the material, thereby improving the reaction efficiency of surface treatment and significantly reducing the amount of glyoxal used, avoiding raw material waste, reducing production costs, and minimizing environmental pollution risks, safety management difficulties, and occupational health risks. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the integrated drying and surface treatment device for cellulose ethers and their derivatives according to a specific embodiment of the present invention;

[0031] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0032] Figure 3 for Figure 1 The image shows a side cross-sectional view of the vacuum rake dryer in the integrated drying and surface treatment device for cellulose ethers and their derivatives.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Vacuum rake dryer; 11. Drying chamber; 12. Hollow cylinder; 121. Vacuum port; 122. Nitrogen backflush port; 13. Outer casing; 14. Sealing cover;

[0035] 2. Delivery pipeline; 21. Input pipe; 22. Y-connector; 23. Check valve; 24. Switch valve;

[0036] 3. Atomizing nozzle;

[0037] 4. Glyoxal supply system; 41. Glyoxal storage tank; 42. Peristaltic pump. Detailed Implementation

[0038] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0039] First, it should be noted that some directional terms used in the following description to clearly illustrate the technical solution of this utility model, such as the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are all derived from the normal orientation of the components in the integrated drying and surface treatment device for cellulose ethers and their derivatives. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0043] Example:

[0044] like Figure 1 and Figure 2 As shown in the embodiment of this application, an integrated device for drying and surface treatment of cellulose ethers and their derivatives is disclosed, which improves the surface treatment reaction efficiency and reduces the amount of glyoxal used. Its specific structure includes: a vacuum rake dryer 1, a conveying pipeline 2, and an atomizing nozzle 3.

[0045] The vacuum rake dryer 1 includes a drying chamber 11 and a hollow cylinder 12. The hollow cylinder 12 is vertically arranged on the top of the drying chamber 11, and the outer side of the hollow cylinder 12 is provided with a vacuum port 121 and a nitrogen backflush port 122. The vacuum port 121 is connected to a vacuum system (not shown in the figure) to remove air from the drying chamber 11, create a vacuum environment, and promote the drying of cellulose ethers and their derivatives.

[0046] It should be noted that, as Figure 3 As shown, other mechanisms of the vacuum rake dryer 1, such as the drive mechanism, stirring mechanism and heating mechanism, are all existing technologies, so they will not be described in detail here.

[0047] It should be noted that by drawing a vacuum, the boiling point of the solvent can be significantly reduced, thereby accelerating the evaporation of the solvent, improving drying efficiency, avoiding the risk of degradation of cellulose ether molecules due to high temperature; it also reduces the oxygen content and prevents the material from undergoing oxidation reaction at high temperature.

[0048] One end of the delivery pipeline 2 extends into the hollow cylinder 12 through the nitrogen backflush port 122, and the other end is divided into two branches. The first branch is connected to the nitrogen supply system (not shown in the figure), and the second branch is connected to the glyoxal supply system 4, so that nitrogen can be used as the delivery carrier of glyoxal, and the two can enter the hollow cylinder 12 together.

[0049] It should be noted that nitrogen backflushing can continuously replace the air inside the chamber, preventing cellulose ether molecules from oxidizing with oxygen at high temperatures and thus preventing problems such as product yellowing.

[0050] The atomizing nozzle 3 is installed at one end of the conveying pipe 2 that extends into the hollow cylinder 12. It is used to atomize the glyoxal so that it enters the drying chamber 11 in the form of droplets, thereby making better contact with cellulose ether and its derivatives and achieving a uniform surface treatment effect.

[0051] This invention modifies the nitrogen backflush port to change the surface treatment container for cellulose ethers and their derivatives from a reaction vessel to a rake dryer, improving the efficiency of the reaction vessel. Furthermore, it eliminates the need to add glyoxal to the reaction solvent, thereby reducing the difficulty of subsequent solvent recovery and treatment. Additionally, it uses a spray method to allow glyoxal to directly contact the material, thus improving the reaction efficiency of surface treatment and significantly reducing the amount of glyoxal used. This avoids raw material waste, lowers production costs, and reduces environmental pollution risks, safety management difficulties, and occupational health risks.

[0052] In some embodiments, such as Figure 2 As shown, the delivery pipeline 2 includes:

[0053] The input pipe 21 has one end extending into the hollow cylinder 12 and is equipped with an atomizing nozzle 3;

[0054] Y-type connector 22, the output end of which is detachably connected to the other end of input pipe 21, one input end is connected to nitrogen supply system, and the other input end is connected to glyoxal supply system 4.

[0055] The above-mentioned further design of the delivery pipeline 2 simplifies the installation process of the device, reduces the installation difficulty and cost, and facilitates maintenance or replacement through detachable connection, thereby improving maintenance efficiency and reducing downtime.

[0056] In some embodiments, such as Figure 2 As shown, the vacuum rake dryer 1 includes:

[0057] The outer sleeve 13 is installed on the outside of the hollow cylinder 12 and fitted onto the outside of the inlet pipe 21;

[0058] The sealing cap 14 is detachably installed on the end of the outer sleeve 13 away from the hollow cylinder 12 and is fixedly sleeved on the outside of the inlet pipe 21.

[0059] For example, the outer sleeve 13 and the closing cover 14 are connected by a flange to ensure a sealing effect and facilitate installation and disassembly.

[0060] The above-mentioned setup not only serves as a seal to prevent leakage of internal media such as nitrogen and glyoxal, but also fixes and supports the input pipe 21, ensuring the accurate positioning of the atomizing nozzle 3, guaranteeing the surface treatment effect, and improving the convenience of maintenance, making it easier to inspect, repair, or replace the atomizing nozzle 3.

[0061] Based on the above embodiments, such as Figure 2 As shown, the delivery pipeline 2 includes a one-way valve 23, which is connected in series between one input end of the Y-type connector 22 and the nitrogen supply system.

[0062] By setting a one-way valve 23, nitrogen and glyoxal can be effectively prevented from flowing back into the nitrogen supply system, thereby avoiding impact and damage to the nitrogen supply system, and also ensuring the stability of the flow direction of the medium in the pipeline.

[0063] Based on the above embodiments, such as Figure 2 As shown, the delivery pipeline 2 includes a switching valve 24, which is connected in series between the other input end of the Y-type connector 22 and the glyoxal supply system 4.

[0064] If any abnormal situation occurs during the operation of the equipment, such as abnormal pressure in the glyoxal supply system, pipeline leakage, or abnormal reaction in the drying chamber 11, the operator can quickly close the switch valve 24 to cut off the delivery of glyoxal, prevent the problem from escalating further, and ensure the safe operation of the equipment.

[0065] By setting the switching valve 24, the supply of glyoxal can be controlled, thereby playing a role in the start-up, shutdown, maintenance, and response to abnormalities of the equipment, and improving the safety of the equipment.

[0066] In some embodiments, such as Figure 2 As shown, the glyoxal supply system 4 includes:

[0067] Glyoxal storage tank 41 is used to store glyoxal to ensure a sufficient supply of glyoxal.

[0068] The peristaltic pump 42 has its input end connected to the glyoxal storage tank 41 via a pipeline, and its output end connected to the second branch of the delivery pipeline 2 via a pipeline.

[0069] The design of the glyoxal supply system 4 described above ensures that glyoxal can be delivered in sufficient and stable quantities, thus improving the stability of the device operation.

[0070] The specific workflow of the above technical solution is as follows:

[0071] Step 1: Start the main shaft of the vacuum rake dryer 1, then open its feed inlet, transfer the wet material into the drying chamber 11, and then close the feed inlet.

[0072] Step 2: Turn on the vacuum system and allow it to apply appropriate vacuum to the drying chamber 11 of the vacuum rake dryer 1 through the vacuum port 121. Then turn off the vacuum system.

[0073] Step 3: Turn on the nitrogen supply system and send compressed nitrogen into delivery pipeline 2;

[0074] Step 4: Turn on the glyoxal supply system 4 and send glyoxal into the conveying pipeline 2, so that compressed nitrogen and glyoxal can be combined in the conveying pipeline 2. Then, the glyoxal enters the hollow cylinder 12 through the atomizing nozzle 3 and atomizes the glyoxal, so that the glyoxal is evenly sprayed on the material for surface treatment.

[0075] Step 5: Stir the vacuum rake dryer 1 at room temperature for 30 minutes;

[0076] Step 6: Restart the vacuum system and activate the heating function of the vacuum rake dryer 1 to begin rake-drying the material.

[0077] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. An integrated device for drying and surface treatment of cellulose ethers and their derivatives, characterized in that, include: A vacuum rake dryer includes a drying chamber and a hollow cylinder. The hollow cylinder is vertically installed at the top of the drying chamber, and the outer side of the hollow cylinder is provided with a vacuum port and a nitrogen backflush port. The vacuum port is connected to a vacuum system. The delivery pipeline extends into the hollow cylinder through the nitrogen backflush port at one end, and splits into two branches at the other end. The first branch is connected to the nitrogen supply system, and the second branch is connected to the glyoxal supply system. An atomizing nozzle is installed at one end of the delivery pipeline that extends into the hollow cylinder.

2. The integrated drying and surface treatment apparatus for cellulose ethers and their derivatives according to claim 1, characterized in that, The delivery pipeline includes: An input tube, one end of which extends into the hollow cylinder and is equipped with the atomizing nozzle; The Y-type connector has an output end that can be detachably connected to the other end of the input tube. One input end is connected to the nitrogen supply system, and the other input end is connected to the glyoxal supply system.

3. The integrated drying and surface treatment apparatus for cellulose ethers and their derivatives according to claim 2, characterized in that, The vacuum rake dryer includes: An outer sleeve is installed on the outside of the hollow cylinder and fitted over the inlet pipe; The sealing cap is detachably installed at the end of the outer sleeve away from the hollow cylinder and is fixedly sleeved on the outside of the input pipe.

4. The integrated drying and surface treatment apparatus for cellulose ethers and their derivatives according to claim 2, characterized in that, The delivery pipeline includes: A one-way valve is connected in series between one input terminal of the Y-connector and the nitrogen supply system.

5. The integrated drying and surface treatment apparatus for cellulose ethers and their derivatives according to claim 2, characterized in that, The delivery pipeline includes: A switching valve is connected in series between the other input terminal of the Y-connector and the glyoxal supply system.

6. The integrated drying and surface treatment apparatus for cellulose ethers and their derivatives according to claim 1, characterized in that, The glyoxal supply system includes: Glyoxal storage tank; The peristaltic pump has its input end connected to the glyoxal storage tank via a pipeline, and its output end connected to the second branch of the delivery pipeline via a pipeline.

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