A sulfuric acid soaking device for filter bag method determination of lignin

Abstract

The utility model relates to lignin content determination experimental device technical field discloses a kind of for filter bag method determination lignin sulfuric acid soaking device, comprising: the soaking box of top opening, the top of soaking box is detachably connected with box cover, box cover can be installed above soaking box along first direction and the reverse direction of first direction;Screen box is detachably installed in the mesh structure of soaking box, and screen box is used to load filter bag;And first magnetic component and second magnetic component are respectively installed on box cover and screen box, box cover is installed above soaking box along first direction, first magnetic component and second magnetic component attract each other, box cover is installed above soaking box along the reverse direction of first direction, first magnetic component and second magnetic component repel each other.The utility model can ensure that filter bag keeps intact during soaking process, avoids sample confusion problem, facilitates subsequent washing process, significantly improves the accuracy and operability of experimental data.

Description

Technical Field

[0001] This utility model relates to the technical field of experimental apparatus for determining lignin content, and in particular to a sulfuric acid immersion apparatus for determining lignin using the filter bag method. Background Technology

[0002] In the field of chemical analysis of biomass resources such as wood and crop straw, accurate determination of lignin content is of paramount importance for the comprehensive utilization of biomass, the development of biomass energy, and the research of biomass materials. The filter bag method, as an effective means of determining lignin content, is widely used due to its relatively simple operation and low cost. With the continuous deepening of biomass scientific research and the vigorous development of the biomass industry, the need for improvements to the sulfuric acid immersion apparatus for lignin determination using the filter bag method is becoming increasingly prominent. Its application prospects are broad, and it is expected to provide more accurate and efficient technical support for related research in the biomass field, contributing to the efficient conversion and utilization of biomass resources.

[0003] In the experiment for determining lignin content, the core step of the filter bag method is to place the sample into a filter bag and then immerse it in 72% concentrated sulfuric acid to remove impurities such as cellulose. However, in traditional operations, multiple filter bags are often immersed simultaneously in a large beaker. Due to the strong corrosiveness and oxidizing properties of concentrated sulfuric acid, the filter bags are prone to localized carbonization during immersion. This carbonization can cause the sample numbers pre-marked on the filter bags to become blurred or even disappear completely, leading to sample confusion and severely affecting the accuracy and reliability of experimental data. Traditional methods face many problems in practical applications that urgently need to be solved, hindering the further application and development of the filter bag method in lignin content determination.

[0004] In summary, in order to address the shortcomings of the existing filter bag method for determining lignin by sulfuric acid immersion, it is particularly necessary to develop a novel sulfuric acid immersion device. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this invention aims to provide a sulfuric acid immersion device for the determination of lignin using the filter bag method. This device allows for the independent immersion of filter bags in batches and facilitates washing, thereby improving the efficiency and accuracy of lignin determination experiments.

[0006] In order to achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A sulfuric acid immersion apparatus for the determination of lignin using the filter bag method, comprising:

[0008] A soaking box with an open top, wherein a lid is detachably connected to the top of the soaking box, and the lid can be installed on the soaking box in a first direction and in the opposite direction of the first direction.

[0009] A mesh-structured sieve box, detachably installed within the soaking box, for holding filter bags; and

[0010] A first magnetic component and a second magnetic component are respectively installed on the lid and the sieve box. The lid is installed above the soaking box along a first direction, and the first magnetic component and the second magnetic component attract each other. The lid is installed above the soaking box in the opposite direction of the first direction, and the first magnetic component and the second magnetic component repel each other.

[0011] Furthermore, 2n first magnetic elements are embedded in the lid, and 2n second magnetic elements are embedded in the top of the sieve box, where n is a positive integer. The first and second magnetic elements are arranged opposite to each other. The lid is installed above the soaking box along a first direction. The magnetic poles of the oppositely arranged first and second magnetic elements are opposite. The lid is installed above the soaking box in the opposite direction of the first direction. The magnetic poles of the oppositely arranged first and second magnetic elements are the same.

[0012] Furthermore, there are two of each of the first and second magnetic components. The magnetic poles of the two first magnetic components facing the second magnetic component are opposite, and the magnetic poles of the two second magnetic components facing the first magnetic component are opposite. When the lid can be installed above the soaking box along the first direction and in the opposite direction of the first direction, the two first magnetic components and the two second magnetic components are arranged in a one-to-one correspondence.

[0013] Furthermore, the soaking box and the lid are rectangular parallelepiped structures.

[0014] Furthermore, a label sleeve is installed on the side wall of the soaking box and / or the top of the box lid, and a label paper is detachably installed inside the label sleeve.

[0015] Furthermore, the opening of the label sleeve is provided with an arc-shaped opening.

[0016] Furthermore, the sieve box is provided with a horizontal access port.

[0017] Furthermore, a handle is installed on the top of the lid.

[0018] Furthermore, it also includes a tray, on the upper surface of which are provided multiple soaking boxes, lids and sieves arranged in a one-to-one correspondence, the soaking boxes being distributed in a rectangular array.

[0019] Compared with the prior art, this utility model has at least the following advantages:

[0020] (1) During the soaking process, the filter bags are loaded into the sieve box in batches. Then, the sieve box containing the filter bags is placed into the soaking box, and concentrated sulfuric acid is introduced into the soaking box. Then, the box cover is installed on the top of the soaking box in the opposite direction of the first direction. Due to the mutual repulsion between the first magnetic component and the second magnetic component, the sieve box can be immersed in the concentrated sulfuric acid. After soaking, the box cover is removed and installed on the top of the soaking box in the first direction. Then, the box cover is lifted. Due to the mutual attraction between the first magnetic component and the second magnetic component, the box cover can lift the sieve box containing the filter bags out of the concentrated sulfuric acid. Then, the filter bags are removed from the sieve box using tweezers or other tools, and the base work can be carried out.

[0021] Through the above method, this invention enables filter bags to be soaked independently in batches, avoiding confusion between different samples. Furthermore, after soaking, the filter bags can be easily removed from the sieve box for subsequent washing. Therefore, this invention ensures that the filter bags remain intact during soaking, avoids sample confusion, facilitates subsequent washing, and significantly improves the accuracy and operability of experimental data.

[0022] (2) This invention uses a label sleeve on the outer wall and / or top of the lid of each soaking box, with a label inside the sleeve for marking the sample number using a waterproof, acid-resistant marker. This design ensures that the sample number is not lost due to carbonization of the filter bag during soaking and remains clearly identifiable. Researchers can clearly identify the sample number in each soaking box using the label inside the sleeve, thus avoiding sample confusion and ensuring the accuracy and traceability of experimental results. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the sulfuric acid immersion device for the determination of lignin using the filter bag method according to this utility model;

[0025] Figure 2 This is a cross-sectional view of the soaking box, lid, sieve box, and other components of this utility model;

[0026] Figure 3 This is an exploded view of the soaking box, lid, sieve box, and other components of this utility model.

[0027] Reference numerals: 1. Immersion box; 2. Box lid; 3. Sieve box; 4. First magnetic component; 5. Second magnetic component; 6. Label sleeve; 7. Arc-shaped opening; 8. Label paper; 9. Handle; 10. Tray. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Figure 1-3 This utility model provides a sulfuric acid immersion device for determining lignin using the filter bag method, comprising a tray 10 and an immersion unit, the specific structure of which is as follows:

[0031] The tray 10 is made of polytetrafluoroethylene and has a rectangular structure. Its upper surface is provided with a receiving groove to hold multiple soaking units.

[0032] There are 12 soaking units, evenly distributed on tray 10 in a 3×4 array. Each soaking unit includes a soaking box 1, a lid 2, and a sieve box 3. The soaking box 1 is also made of polytetrafluoroethylene (PTFE), with internal dimensions of 10cm long, 6cm wide, and 6cm high, and an open top. The soaking box 1 can hold filter bags and 72% concentrated sulfuric acid, ensuring full contact between the filter bags and the sulfuric acid during soaking. The lid 2 is a PTFE lid that matches the soaking box 1 and can be installed above the soaking box 1 in both the first direction and its opposite direction. The lid 2 has a sealing ring on its edge to reduce sulfuric acid evaporation, prevent personnel from inhaling harmful gases, and reduce experimental safety risks. The sieve box 3, placed inside the soaking box 1, is a mesh structure made of PTFE, with external dimensions of 9.8cm long, 5.8cm wide, and 5.5cm high. It has a horizontal access opening for storing and retrieving filter bags. By using filter bags, it is possible to ensure that the filter bags are in full contact with sulfuric acid during the soaking process, while also making it easy to remove and wash the filter bags after soaking. Each sieve box 3 can hold 10 filter bags, which are arranged neatly inside the sieve box 3 to avoid mutual interference.

[0033] Each soaking box 1 has a label sleeve 6 on its outer wall and / or the top of its lid 2. The label sleeve 6 contains a label paper 8. The label paper 8 can be marked with a waterproof and acid-resistant marker to ensure that the sample number is clearly identifiable and facilitates the laboratory personnel to trace the sample information.

[0034] The lid 2 is fitted with 2n first magnetic elements 4, and the top of the sieve box 3 is fitted with 2n second magnetic elements 5, where n is a positive integer. The first magnetic elements 4 and the second magnetic elements 5 are preferably permanent magnets. The first magnetic elements 4 and the second magnetic elements 5 are arranged opposite to each other. The lid 2 is installed above the soaking box 1 along the first direction, and the magnetic poles of the opposite surfaces of the first magnetic elements 4 and the second magnetic elements 5 are the same. The lid 2 is installed above the soaking box 1 in the opposite direction of the first direction, and the magnetic poles of the opposite surfaces of the first magnetic elements 4 and the second magnetic elements 5 are the same.

[0035] In one specific embodiment of this utility model, there are two first magnetic elements 4 and two second magnetic elements 5. The magnetic poles of the two first magnetic elements 4 facing the second magnetic elements 5 are opposite, and the magnetic poles of the two second magnetic elements 5 facing the first magnetic elements 4 are opposite.

[0036] Reference Figure 2 For example, the upper surfaces of the two first magnetic components 4 have N poles and S poles, respectively. When the lid 2 is installed above the soaking box 1 along the first direction, the magnetic poles on the lower surfaces corresponding to the two first magnetic components 4 are S and N poles. At this time, the first magnetic components 4 and the second magnetic component 5 attract each other. Conversely, if the lid 2 is rotated 180 degrees horizontally and then installed above the soaking box 1 again, the magnetic poles on the lower surfaces corresponding to the two first magnetic components 4 are N and S poles. At this time, the first magnetic components 4 and the second magnetic component 5 repel each other.

[0037] It should be noted that by increasing the quality of the lid 2 or increasing the friction between the lid 2 and the soaking box 1, it is possible to ensure that the lid 2 is installed on the soaking box 1 under the premise that the first magnetic component 4 and the second magnetic component 5 repel each other, thus preventing the lid 2 from falling off.

[0038] The tray 10, lid 2, and sieve box 3 are all made of polytetrafluoroethylene using a one-piece molding process. This material has excellent corrosion resistance and can withstand the corrosion of 72% concentrated sulfuric acid for a long time, avoiding experimental contamination caused by damage to the device itself and ensuring the accuracy of experimental results.

[0039] Specific operating steps of this utility model:

[0040] Step 1: Sample loading.

[0041] Place the filter bags containing the samples into the sieve boxes 3 one by one. Each sieve box 3 can hold 10 filter bags. The filter bags are arranged neatly in the sieve boxes 3 to avoid mutual interference. Then, gently place the sieve boxes 3 containing the filter bags into the small soaking box 1.

[0042] Step 2: Preparation.

[0043] First, place tray 10 on the experimental table, ensuring it is level and stable. Then, place the 12 immersion unit boxes on tray 10 in a neat 3×4 array.

[0044] Use a waterproof, acid-resistant marker to mark the sample number in the numbering area on the outer wall of each small box to ensure that the number is clear and identifiable, facilitating subsequent experimental operations and result traceability.

[0045] Step 3: Soaking.

[0046] Add an appropriate amount of 72% concentrated sulfuric acid to each soaking box 1. The sulfuric acid level should submerge the filter bag, but should not exceed the overall height of the soaking box 1 to prevent sulfuric acid from overflowing. Then, place the box lid 2 onto the soaking box 1 in the reverse direction, ensuring that the sealing ring on the edge of the box lid 2 fits tightly against the top of the box. Due to the repulsive force between the first magnetic component 4 and the second magnetic component 5, the sieve box 3 containing the filter bag can be completely submerged in the concentrated sulfuric acid liquid, preventing the filter bag from floating and the sulfuric acid from evaporating.

[0047] Place tray 10 along with the soaking unit in a constant temperature water bath, set the water bath temperature, and soak for a certain period of time. During the soaking process, concentrated sulfuric acid reacts with impurities such as cellulose in the filter bag, dissolving and removing them, while lignin remains in the filter bag.

[0048] Step 4: Washing process.

[0049] After soaking, carefully open the lid 2 and place it inside the soaking box 1 along the first direction. Due to the mutual attraction between the first magnetic component 4 and the second magnetic component 5, when the lid 2 is lifted again, the sieve box 3 containing the filter bag can be removed together with the lid 2 to drain the sulfuric acid solution. Then, use tweezers to remove the filter bag from the sieve box 3 and place it in a beaker containing deionized water. Gently stir to wash the filter bag to remove residual sulfuric acid and dissolved impurities. Repeat the washing process 3-5 times until there is no obvious sulfuric acid residue on the surface of the filter bag.

[0050] Step 5: Follow-up processing.

[0051] After washing, place the filter bag on filter paper to air dry. Once the filter bag is completely dry, subsequent lignin content determination operations can be performed, such as weighing and ashing.

[0052] Through the above specific embodiments, the sulfuric acid soaking device of this invention can effectively avoid carbonization of the filter bags during the sulfuric acid soaking process, ensuring that the sample numbers are clearly identifiable and facilitating accurate identification and differentiation of samples. Simultaneously, the device enables batch-by-batch independent soaking of the filter bags, ensuring sufficient and uniform contact between the sulfuric acid and the filter bags, simplifying the stirring operation process, reducing operational difficulty and safety risks, and significantly improving the efficiency and accuracy of lignin determination experiments.

[0053] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element 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.

[0054] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A sulfuric acid immersion apparatus for determining lignin using the filter bag method, characterized in that, include: A soaking box (1) with an open top, the top of which is detachably connected to a lid (2), the lid (2) being able to be installed above the soaking box (1) in a first direction and in the opposite direction of the first direction; A mesh-like sieve box (3) detachably installed within the soaking box (1), the sieve box (3) being used to load filter bags; and A first magnetic element (4) and a second magnetic element (5) are respectively installed on the lid (2) and the sieve box (3). The lid (2) is installed above the soaking box (1) along a first direction. The first magnetic element (4) and the second magnetic element (5) attract each other. The lid (2) is installed above the soaking box (1) in the opposite direction of the first direction. The first magnetic element (4) and the second magnetic element (5) repel each other.

2. The sulfuric acid immersion apparatus for determining lignin using the filter bag method according to claim 1, characterized in that, The lid (2) is fitted with 2n first magnetic elements (4), and the top of the sieve box (3) is fitted with 2n second magnetic elements (5), where n is a positive integer. The first magnetic elements (4) and the second magnetic elements (5) are arranged opposite to each other. The lid (2) is installed above the soaking box (1) along the first direction. The opposite magnetic elements (4) and the second magnetic elements (5) have opposite magnetic poles on their opposite faces. The lid (2) is installed above the soaking box (1) in the opposite direction along the first direction. The opposite magnetic elements (4) and the second magnetic elements (5) have the same magnetic poles on their opposite faces.

3. The sulfuric acid immersion apparatus for determining lignin using the filter bag method according to claim 2, characterized in that, The number of the first magnetic element (4) and the second magnetic element (5) are both two. The magnetic poles of the two first magnetic elements (4) facing the second magnetic element (5) are opposite, and the magnetic poles of the two second magnetic elements (5) facing the first magnetic element (4) are opposite. When the box cover (2) can be installed above the soaking box (1) in the first direction and in the opposite direction of the first direction, the two first magnetic elements (4) and the two second magnetic elements (5) are arranged in a one-to-one correspondence.

4. The sulfuric acid immersion apparatus for determining lignin using the filter bag method according to claim 3, characterized in that, The soaking box (1) and the lid (2) are rectangular parallelepiped structures.

5. The sulfuric acid immersion apparatus for determining lignin using the filter bag method according to claim 2, characterized in that, A label sleeve (6) is installed on the side wall of the soaking box (1) and / or the top of the box cover (2), and a label paper (8) is detachably installed inside the label sleeve (6).

6. The sulfuric acid immersion apparatus for determining lignin using the filter bag method according to claim 5, characterized in that, The label sleeve (6) has an arc-shaped opening (7) at its opening.

7. The sulfuric acid immersion apparatus for determining lignin using the filter bag method according to claim 1, characterized in that, The sieve box (3) is provided with a horizontal access port.

8. The sulfuric acid immersion apparatus for determining lignin using the filter bag method according to claim 1, characterized in that, A handle (9) is installed on the top of the lid (2).

9. The sulfuric acid immersion apparatus for determining lignin by the filter bag method according to any one of claims 1 to 8, characterized in that, It also includes a tray (10), on the upper surface of which are provided multiple soaking boxes (1), box lids (2) and sieve boxes (3) arranged in a one-to-one correspondence, and the soaking boxes (1) are distributed in a rectangular array.

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