Teaching experiment equipment
By designing a teaching experimental device that includes a glass tube, a heating device, and a ventilation device, the safety hazards and inaccurate product identification in the catalytic oxidation reaction of ethanol were solved, and the safe and efficient generation and confirmation of acetaldehyde were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-03-10
AI Technical Summary
The current teaching methods for catalytic oxidation of ethanol have safety hazards and inaccurate product identification.
Design a teaching experimental device, including a glass tube, a heating device, a ventilation device, and a test tube, to generate acetaldehyde through the reaction of ethanol liquid, copper components, and oxygen, and to confirm the generation of acetaldehyde by using copper hydroxide solution to generate a brick-red precipitate, thereby improving safety and accuracy.
This improves the safety of the catalytic oxidation of ethanol and the accuracy of product identification, ensuring the safety of the experimental process and the reliability of the results.
Smart Images
Figure CN223986375U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to experimental equipment field, more specifically, relate to a kind of teaching experimental equipment. BACKGROUND
[0002] Ethanol catalytic oxidation reaction is the key of ethanol property, also the difficulty in ethanol property, is the basis of connecting ethanol→acetaldehyde→acetic acid conversion chain.In related teaching, the experiment that ethanol catalytic oxidation generates acetaldehyde is designed as follows: after the spiral copper wire is burnt on alcohol lamp, it is inserted into the ethanol test tube, repeatedly several times, then smell the smell in test tube.But in this experiment, the spiral copper wire of burning hot is inserted into the slender test tube, there is security risk, in addition, since ethanol itself smell is big, the existence of acetaldehyde in product is judged using fan smelling method, and the judgment accuracy is lower. UTILITY MODEL CONTENT
[0003] The utility model embodiment provides a kind of teaching experimental equipment.
[0004] A kind of teaching experimental equipment is used for ethanol catalytic oxidation reaction and the verification of acetaldehyde, the teaching experimental equipment includes:
[0005] Glass tube, for accommodating ethanol liquid;
[0006] Heating device, the heating device includes heating core, the heating core is inserted in the glass tube, copper piece is equipped on the heating core;
[0007] Ventilation device, for the air into the glass tube;
[0008] First test tube, the first test tube is connected with the glass tube by first air pipe, and the first test tube is used to accommodate copper hydroxide solution.
[0009] In the above teaching experimental equipment, ethanol liquid, copper piece and oxygen in air can react to generate acetaldehyde, and acetaldehyde can react with copper hydroxide solution in the first test tube to generate brick red cuprous oxide precipitate, since heating core is inserted in glass tube, safety is higher, in addition, by observing the generation of brick red cuprous oxide precipitate, the reaction of acetaldehyde generated in glass tube can be more accurately confirmed.
[0010] In certain embodiments, the teaching experimental equipment includes first container, and the first test tube is at least partially accommodated in the first container, and the first container is used to accommodate hot water.
[0011] In certain embodiments, the teaching experimental equipment includes second test tube, and the second test tube is connected with the first test tube by second air pipe, and the second test tube is used to accommodate silver ammonia solution.
[0012] In some embodiments, the teaching experiment apparatus comprises a second container, the second test tube is at least partially accommodated in the second container, and the second container is used for accommodating hot water.
[0013] In some embodiments, the teaching experiment apparatus comprises a third container and a third gas tube, one end of the third gas tube is connected with the second test tube, and the other end of the third gas tube is inserted in the third container, and the third container is used for accommodating sodium hydroxide solution.
[0014] In some embodiments, the teaching experiment apparatus comprises a liquid injection device, and the liquid injection device is used for injecting the ethanol liquid into the glass tube.
[0015] In some embodiments, the liquid injection device comprises a syringe, and the syringe comprises a needle tube and a needle arranged on the needle tube, and the needle is inserted in the glass tube.
[0016] In some embodiments, the teaching experiment apparatus comprises a rack and a clamping member arranged on the rack, and the glass tube is clamped on the clamping member.
[0017] In some embodiments, the copper member is a copper wire, and the copper wire is wound on the heating core.
[0018] In some embodiments, the ventilation device comprises two connecting balls.
[0019] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0020] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
[0021] Figure 1 is a structural schematic diagram of a teaching experiment apparatus of an embodiment of the present application.
[0022] EXPLANATION OF REFERENCE NUMERALS:
[0023] 100 - teaching experiment apparatus; 10 - glass tube; 12 - heating device; 13 - heating core; 14 - ventilation device; 15 - copper member; 16 - first test tube; 18 - first gas tube; 20 - first container; 22 - second test tube; 24 - second gas tube; 26 - second container; 28 - third container; 30 - third gas tube; 32 - liquid injection device; 34 - syringe; 36 - needle tube; 38 - needle; 40 - rack; 42 - clamping member. DETAILED DESCRIPTION
[0024] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are merely intended to explain the present application, and should not be understood as limiting the present application.
[0025] In the present application, unless specifically defined and limited otherwise, the "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "on", "above" and "under" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0026] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. For the purpose of simplifying the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.
[0027] Please refer to Figure 1 The present application discloses a kind of teaching experimental equipment 100, for ethanol catalytic oxidation reaction and the detection of acetaldehyde, teaching experimental equipment 100 includes glass tube 10, heating device 12, ventilation device 14 and first test tube 16, glass tube 10 is used to accommodate ethanol liquid;Heating device 12 includes heating core 13, heating core 13 is inserted in glass tube 10, heating core 13 is equipped with copper piece 15;Ventilation device 14 is used to be ventilated into glass tube 10 into air;First test tube 16 is connected with glass tube 10 by first air pipe 18, and first test tube 16 is used to accommodate copper hydroxide (Cu (OH) 2) solution.
[0028] In the aforementioned teaching experimental equipment 100, ethanol liquid, copper part 15 and oxygen in the air can react to generate acetaldehyde (CH3CHO). Acetaldehyde reacts with copper hydroxide solution in the first test tube 16 to generate a brick-red cuprous oxide precipitate. Since the heating core 13 is inserted into the glass tube 10, the safety is relatively high. In addition, by observing the generation of the brick-red cuprous oxide precipitate, it can be confirmed more accurately that acetaldehyde is generated in the glass tube 10.
[0029] Specifically, the glass tube 10 can be a tube open at both ends, and the openings of the glass tube 10 can be sealed with plugs. The plugs for the glass tube 10 can be double-hole plugs. The ethanol liquid inside the glass tube 10 can be anhydrous ethanol. The glass tube 10 is a straight glass tube; the small space and straight walls of the straight glass tube 10 are very conducive to the addition of ethanol and the expulsion of acetaldehyde.
[0030] The heating device 12 can be a resistance heating device, and the heating core 13 can be in the shape of a strip. In other words, after the heating device 12 is powered on, the heating core 13 can generate heat, which in turn raises the temperature of the copper part 15.
[0031] During the use of the teaching experimental equipment 100, the copper component 15 can come into contact with liquid ethanol. The ventilation device 14 can introduce air into the glass tube 10. Because air contains oxygen, the heated copper component 15 can react with oxygen to produce copper oxide (CuO), and then react with ethanol to produce acetaldehyde. The copper component 15 exhibits alternating black and red colors. The chemical reaction process is as follows:
[0032] 2Cu + O2 2CuO;
[0033] CH3CH2OH+CuO CH3CHO+H2O+Cu;
[0034]
[0035] The overall equation is: 2CH3CH2OH + O2 → 2CH3CHO + 2H2O
[0036] One end of the first endotracheal tube 18 can be inserted into the stopper of the first glass tube 10, and the other end can be inserted into the stopper of the first test tube 16, thus being inserted into the first test tube 16. In the first test tube 16, copper hydroxide solution can be obtained by reacting copper sulfate (CuSO4) with sodium hydroxide. Copper hydroxide is present in the sodium hydroxide solution. In the first test tube 16, acetaldehyde reacts with the copper hydroxide solution to produce brick-red cuprous oxide. The reaction formula is as follows:
[0037] CH3CHO + 2Cu(OH)2 + NaOH CH3COONa + Cu2O↓ + 3H2O
[0038] Please see Figure 1 In some embodiments, the teaching experimental equipment 100 includes a first container 20, in which a first test tube 16 is at least partially contained, and the first container 20 is used to contain hot water.
[0039] In this way, the hot water in the first container 20 can heat the first test tube 16, allowing the solution in the first test tube 16 to proceed smoothly. In addition, the first container 20 can stabilize the position of the first test tube 16.
[0040] In one example, the first container 20 can be a conical flask. Conical flasks can eliminate the cumbersome operation of fixing equipment with iron stands. The heat preservation effect of hot water in conical flasks is better than that of beakers and test tubes. The temperature of hot water in the first container 20 can be around 85℃, for example, 85℃±5℃.
[0041] Please see Figure 1 In some embodiments, the teaching experimental equipment 100 includes a second test tube 22, which is connected to the first test tube 16 via a second air tube 24, and is used to contain silver ammonia solution.
[0042] Thus, the silver ammonia solution reacts with acetaldehyde to form a silver precipitate, which causes the wall of the second test tube 22 to form a bright silver mirror. The reaction formula is as follows:
[0043] CH3CHO + 2[Ag(NH3)2]OH CH3COONH4+ 3NH3+ 2Ag↓+ H2O
[0044] Silver ammonia solution can be obtained by reacting ammonia water (ammonia water) and silver nitrate (AgNO3). For example, the concentrations of both ammonia water and silver nitrate can be 2%.
[0045] Please see Figure 1 In some embodiments, the teaching experimental equipment 100 includes a second container 26, in which the second test tube 22 is at least partially contained, and the second container 26 is used to contain hot water.
[0046] In this way, the hot water in the second container 26 can heat the second test tube 22, allowing the solution in the second test tube 22 to proceed smoothly. In addition, the second container 26 can stabilize the position of the second test tube 22.
[0047] In one example, the second container 26 can be a conical flask. Conical flasks can eliminate the cumbersome operation of fixing equipment with iron stands. The heat preservation effect of hot water in conical flasks is better than that of beakers and test tubes. The temperature of hot water in the second container 26 can be around 80℃, for example, 80℃±5℃.
[0048] Please see Figure 1 In some embodiments, the teaching experimental equipment 100 includes a third container 28 and a third trachea 30. One end of the third trachea 30 is connected to the second test tube 22, and the other end is inserted into the third container 28, which is used to contain sodium hydroxide solution.
[0049] Thus, the sodium hydroxide solution in the third container 28 can recover excess acetaldehyde without polluting the environment. Specifically, the third container 28 can be an Erlenmeyer flask, and the chemical reaction in the third container 28 is as follows:
[0050] 2CH3CHO CH3COO — + CH3CH2OH
[0051] At least one of the first trachea 18, the second trachea 24 and the third trachea 30 mentioned above can be a rigid tube, a flexible tube, or a combination of a flexible tube and a rigid tube.
[0052] Please see Figure 1 In some embodiments, the teaching experimental equipment 100 includes a liquid injection device 32 for injecting ethanol liquid into the glass tube 10.
[0053] In this way, the liquid injection device 32 can more conveniently inject ethanol liquid into the glass tube 10.
[0054] Please see Figure 1 In some embodiments, the injection device 32 includes a syringe 34, which includes a needle tube 36 and a needle 38 disposed on the needle tube 36, the needle 38 being inserted into the glass tube 10. Thus, the syringe 34 can accurately measure the volume of ethanol liquid and inject the ethanol liquid into the glass tube 10. Specifically, the pillow can be fixed to the stopper of the glass tube 10.
[0055] Please see Figure 1 In some embodiments, the teaching experimental equipment 100 includes a frame 40 and a clamping member 42 disposed on the frame 40, with the glass tube 10 clamped in the clamping member 42. Thus, the frame 40 and the clamping member 42 can stabilize the position of the glass tube 10, facilitating the smooth conduct of the experiment.
[0056] In some embodiments, the copper component 15 is a copper wire wound around the heating core 13. In this way, the cross-sectional area of the copper wire is smaller, the heating is faster and more uniform, the amount of copper oxide produced is larger, the ethanol vaporization effect is better, the acetaldehyde production is higher, and the bonding with the heating core 13 is more stable.
[0057] In some embodiments, the ventilation device 14 includes a double-bulb assembly. This allows for efficient airflow into the glass tube 10, ensuring sufficient air volume for the chemical reaction within the glass tube 10 to proceed smoothly. The resulting acetaldehyde can then quickly and efficiently enter the first test tube 16, the second test tube 22, and the third test tube.
[0058] In one example, the operation procedure of teaching experimental equipment 100 is as follows:
[0059] Step 1: Connect the heating element 13 to the power cord, wrap it with electrical tape, insert it into one of the holes of the double-hole plug of the glass tube 10, and wrap copper wire around the lower end of the heating element 13.
[0060] Step 2: Connect the two balls to the outer end of the single-hole plug of the glass tube 10, and insert the needle 38 of the syringe 34 through the single-hole plug.
[0061] Step 3: Tightly insert the two rubber stoppers containing the heating element 13 and other components into both ends of the glass tube 10.
[0062] The glass tube 10, containing elements such as the heating element 13, is fixed to the clamp 42 of the frame 40. The syringe 34 draws 1 mL of anhydrous ethanol; the first test tube 16 containing copper hydroxide is placed in the first container 20; the second test tube 22 containing silver ammonia solution is placed in the second container 26 containing hot water; the sodium hydroxide solution is placed in the second container 26 for exhaust gas treatment.
[0063] Step 4, catalytic oxidation of ethanol. Connect heating device 12 to the power supply for approximately 40 seconds until the copper wire turns black. Inject approximately 0.3 mL of anhydrous ethanol. Bubble air into the bipolar bulb at a uniform speed. The alternating red-black color change of the copper wire can be observed. Repeat the above operation approximately 3 times.
[0064] Step 5: Test for the oxidation product acetaldehyde. A bright silver mirror appears in the second test tube 22. Hot water is poured into the first container 20. After about 40 seconds, a brick-red precipitate appears in the first test tube 16. This proves that acetaldehyde was produced by the catalytic oxidation of ethanol.
[0065] In the description of embodiments of this utility model, 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. 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.
[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A teaching experimental apparatus for catalytic oxidation of ethanol and detection of acetaldehyde, characterized in that, The teaching experiment device comprises: a glass tube for containing ethanol liquid; a heating device, which is an electric resistance heating device, comprising a heating core inserted in the glass tube, the heating core being provided with a copper piece, which is a copper wire wound on the heating core; an air supply device for supplying air into the glass tube, the air supply device comprising two connecting balls; and a first test tube connected with the glass tube through a first air pipe, the first test tube being used for containing copper hydroxide solution. The teaching experiment device comprises a liquid injection device for injecting the ethanol liquid into the glass tube.
2. The educational laboratory apparatus of claim 1, wherein, The teaching experiment device comprises a first container, the first test tube being at least partially contained in the first container.
3. The educational laboratory apparatus of claim 1, wherein, The teaching experiment device comprises a second test tube connected with the first test tube through a second air pipe, the second test tube being used for containing silver amine solution.
4. The educational laboratory apparatus of claim 3, wherein, The teaching experiment device comprises a second container, the second test tube being at least partially contained in the second container, the second container being used for containing hot water.
5. The educational laboratory apparatus of claim 3, wherein, The teaching experiment device comprises a third container and a third air pipe, one end of the third air pipe being connected with the second test tube, the other end of the third air pipe being inserted in the third container, the third container being used for containing sodium hydroxide solution.
6. The educational laboratory apparatus of claim 1, wherein, The liquid injection device comprises a syringe, the syringe comprising a needle tube and a needle head provided on the needle tube, the needle head being inserted in the glass tube.
7. The educational laboratory apparatus of claim 1, wherein, The teaching experiment device comprises a rack and a clamping member provided on the rack, the glass tube being clamped on the clamping member.