Matching device of thermogravimetric analyzer and thermogravimetric analyzer

Abstract

The embodiment of the utility model provides a matching device of a thermogravimetric analyzer and the thermogravimetric analyzer. The matching device is characterized in that a windshield covers the outer side of the thermogravimetric analyzer; the tail gas buffering device comprises a tail gas inlet pipe, a tail gas outlet pipe and a buffering structure, the buffering structure comprises a buffering bottle, the first end of the tail gas inlet pipe is connected with a thermogravimetric analyzer tail gas pipe, the buffering bottle is provided with a gas inlet and a gas outlet, the second end of the tail gas inlet pipe is connected with the gas inlet of the buffering bottle, and the gas outlet of the buffering bottle is connected with the tail gas outlet pipe. And the tail gas outlet of the tail gas outlet pipe is communicated with the outside, so that the fluctuation in a thermogravimetric curve caused by disturbance of indoor environment wind and outdoor airflow can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermogravimetric analyzers, and in particular relates to a matching device of a thermogravimetric analyzer and the thermogravimetric analyzer. Background Art

[0002] Thermogravimetric analyzer (TGA) is an instrument that uses thermogravimetric method to detect the relationship between the weight of a substance and the change in temperature / time. It is mainly composed of a furnace, a balance, a sample holder and a computer. The working principle of TGA is that the sample is heated in a furnace under a specific atmosphere, and the high-precision balance connected to the sample holder senses the current weight change of the sample at any time, and transmits the data to the computer, which processes the sample weight to temperature / time curve (i.e., thermogravimetric curve) by computer processing. Since the temperature remains unchanged during phase changes (such as loss of crystal water, crystallization solvent, crystal transformation or thermal decomposition, etc.), the thermogravimetric curve is usually step-shaped, and the area where the weight remains basically unchanged is called a platform. Using this characteristic of the platform, it is possible to distinguish whether the water / solvent contained in the sample is crystal water / solvent or adsorbed water / solvent, and the molecular ratio of the contained crystal water / solvent can be calculated based on the weight loss rate between the platforms.

[0003] Thermogravimetric analysis has the advantages of small sample amount (about 2-5 mg), fast analysis speed (less than 2 hours), and simple operation. At present, it is widely used in drug development and quality control for loss on drying, crystal water characterization, salt screening and crystal form research, crystallization process development, and sample thermal stability investigation. In recent years, many varieties included in the United States Pharmacopoeia and the European Pharmacopoeia (such as vincristine sulfate, amiloride hydrochloride, azithromycin, etc.) have been controlled by thermogravimetric method for their moisture, loss on drying and other indicators. This shows that the quantitative function of thermogravimetric analysis in drug quality research has been recognized by foreign authoritative organizations. The application of this method can effectively solve the limitation of insufficient sample quantity in early research and development, provide a rapid evaluation method for process selection, and meet the requirements of accurate standardization of precious impurity reference substances.

[0004] The following technical problems were found during the use of the thermogravimetric analyzer: (1) When the thermogravimetric analyzer is used for testing, the corresponding weight change is easily affected by the stability of airflow, indoor air conditioning wind and environmental vibration, resulting in large fluctuations in the thermogravimetric curve and poor reproducibility of the test results; (2) The exhaust pipe leads directly to the outdoors, and the test process is easily affected by outdoor thunderstorms, strong winds, vibrations and other airflows, which causes the thermogravimetric curve to suddenly shake violently during the test (such as Figure 1 200-250℃), resulting in failure of the test process. Utility Model Content

[0005] In view of the above problems existing in the prior art, the purpose of the embodiments of the present utility model is to provide a supporting device of a thermogravimetric analyzer and a thermogravimetric analyzer, which can reduce the fluctuations in the thermogravimetric curve caused by the disturbance of indoor environmental wind and outdoor air flow.

[0006] The technical solution adopted in the embodiment of the utility model is:

[0007] A supporting device for a thermogravimetric analyzer, the supporting device comprising a windshield and an exhaust gas buffer device. The windshield is arranged outside the thermogravimetric analyzer. The exhaust gas buffer device comprises an exhaust gas inlet pipe, an exhaust gas outlet pipe and a buffer structure, the buffer structure comprises a buffer bottle, the first end of the exhaust gas inlet pipe is connected to the exhaust gas pipe of the thermogravimetric analyzer, the buffer bottle is provided with an air inlet and an air outlet, the second end of the exhaust gas inlet pipe is connected to the air inlet of the buffer bottle, the air outlet of the buffer bottle is connected to the exhaust gas outlet pipe, and the exhaust gas outlet of the exhaust gas outlet pipe is connected to the outdoors.

[0008] In some embodiments, a first exhaust gas channel is formed between the buffer structure and the air inlet of the exhaust pipe of the thermogravimetric analyzer, and a second exhaust gas channel is formed between the buffer structure and the exhaust gas outlet; along the flow direction of the exhaust gas, the distance provided by the first exhaust gas channel for the exhaust gas to flow is greater than the distance provided by the second exhaust gas channel for the exhaust gas to flow.

[0009] In some embodiments, the supporting device also includes an exhaust gas purification device, which is arranged between the thermogravimetric analyzer and the buffer structure. The exhaust gas inlet of the exhaust gas purification device is connected to the exhaust pipe of the thermogravimetric analyzer, and the exhaust gas outlet of the exhaust gas purification device is connected to the air inlet of the buffer bottle.

[0010] In some embodiments, the exhaust gas purification device includes a pre-adsorption tube, a hydrocarbon trap and an adsorption saturation indicator tube connected in series in sequence, the exhaust gas inlet of the pre-adsorption tube is connected to the exhaust pipe of the thermogravimetric analyzer, and the exhaust gas outlet of the adsorption saturation indicator tube is connected to the air inlet of the buffer bottle of the buffer structure.

[0011] In some embodiments, when the buffer structure includes at least two buffer bottles, the buffer structure includes a fixing rod connected to two adjacent buffer bottles to fix the buffer bottles.

[0012] In some embodiments, the buffer structure further includes a buffer bottle protection box, and the buffer bottle is disposed in the buffer bottle protection box.

[0013] In some embodiments, the wind shield includes a door body and a main body, the main body is provided with an operating port, the door body is arranged at the position of the operating port, and the door body can move relative to the main body to close or open the operating port.

[0014] In some embodiments, the number of buffer bottles is 1 to 7.

[0015] In some embodiments, the air inlet of the buffer bottle is disposed at the top of the buffer bottle, and the air outlet of the buffer bottle is disposed at the bottom of the buffer bottle.

[0016] A thermogravimetric analyzer includes a supporting device of the thermogravimetric analyzer of any embodiment of the present application.

[0017] Compared with the prior art, the beneficial effects of the embodiments of the utility model are: the windproof cover is arranged on the outside of the thermogravimetric analyzer, and the exhaust gas buffer device is only connected to the exhaust pipe of the thermogravimetric analyzer, which can reduce the influence of the indoor ambient wind on the thermogravimetric detection process of the sample; the exhaust gas buffer device can balance the indoor and outdoor air pressures through the buffer bottle when there is strong convection outdoors, so as to effectively improve the airflow stability of the thermogravimetric analyzer, so that the thermogravimetric curve obtained after the thermogravimetric analyzer is tested is smoother and basically does not fluctuate, thereby improving the reproducibility of the results of the thermogravimetric curve.

[0018] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to restrict the present invention.

[0019] The overview of various implementations or examples of the technology described in this utility model is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In the drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments of the utility model. When appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present device or method.

[0021] Figure 1 This is a schematic diagram showing violent shaking of the thermogravimetric curve.

[0022] Figure 2 The utility model is a schematic structural diagram of a windshield according to an embodiment of the present invention.

[0023] Figure 3 It is a schematic diagram of a buffer structure according to an embodiment of the present utility model.

[0024] Figure 4 This is a schematic diagram of the effect of the exhaust gas buffer device of Example 1 of the utility model on the thermogravimetric curve.

[0025] Figure 5 It is a schematic structural diagram of an exhaust gas purification device according to an embodiment of the utility model.

[0026] Figure 6 This is a schematic diagram of the exhaust gas purification effect of Example 2 of the utility model.

[0027] Reference numerals:

[0028] 1-lock; 2-door handle; 3-hydraulic rod; 4-prefabricated hole; 5-exhaust gas inlet pipe; 6-buffer bottle; 7-exhaust gas outlet pipe; 8-pre-adsorption tube; 9-reducing ferrule; 10-hydrocarbon trap; 11-adsorption saturation indicator tube; 12-fixing rod; 13-buffer bottle protection box. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of 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.

[0030] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "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. Words such as "include" or "comprise" and the like 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. Words such as "connect" or "connected" and the like 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.

[0031] In order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits detailed descriptions of known functions and known components.

[0032] like Figure 2 and Figure 3As shown, the embodiment of the utility model provides a supporting device for a thermogravimetric analyzer, and the supporting device includes a windshield and an exhaust gas buffer device. The windshield is arranged on the outside of the thermogravimetric analyzer. The exhaust gas buffer device includes a buffer bottle 6, the first end of the exhaust gas inlet pipe 5 is connected to the exhaust pipe of the thermogravimetric analyzer, the buffer bottle 6 is provided with an air inlet and an air outlet, the second end of the exhaust gas inlet pipe 5 is connected to the air inlet of the buffer bottle 6, the air outlet of the buffer bottle 6 is connected to the exhaust gas outlet pipe 7, and the exhaust gas outlet of the exhaust gas outlet pipe 7 is connected to the outdoors.

[0033] In some embodiments, when the buffer structure includes at least two buffer bottles, the second end of the exhaust gas inlet pipe 5 is connected to the air inlet of the most upstream buffer bottle 6 of the at least two buffer bottles 6, and the air outlet of the most downstream buffer bottle 6 is connected to the exhaust gas outlet pipe 7, and the exhaust gas outlet of the exhaust gas outlet pipe 7 is connected to the outdoors. Along the flow direction of the exhaust gas, the air outlet at the bottom of the upstream buffer bottle 6 is connected to the air inlet at the top of the adjacent downstream buffer bottle 6 through a connecting pipe.

[0034] The wind shield is installed on the outside of the thermogravimetric analyzer to isolate the thermogravimetric analyzer from indoor air conditioning wind and other airflows, avoiding fluctuations in the thermogravimetric curve caused by indoor airflow disturbances and improving the accuracy of the test results.

[0035] The tail gas generated by the thermogravimetric analyzer during the detection process is discharged through the tail gas pipe of the thermogravimetric analyzer. The tail gas inlet pipe 5 of the tail gas buffer device discharges the tail gas in the tail gas pipe of the thermogravimetric analyzer into the buffer structure, and the tail gas passes through each buffer bottle 6 in sequence according to the series connection order of each buffer bottle 6 and is discharged.

[0036] The outdoor airflow enters the empty buffer bottle 6 through the exhaust gas outlet pipe 7 of the exhaust gas buffer device. The buffer bottle 6 plays the role of airflow buffering, reducing the influence of the outdoor airflow on the thermogravimetric analyzer in the windproof cover, avoiding the curve fluctuation in the thermogravimetric curve caused by the outdoor airflow, improving the stability of the thermogravimetric curve, increasing the accuracy of the test results, and improving the reproducibility of the results.

[0037] In some embodiments, the bottom of the wind shield is provided with a prefabricated hole 4. The prefabricated hole 4 can be provided in plurality. It is used to pass power lines, carrier gas, water bath pipes and tail gas pipes, etc. The shape of the prefabricated hole 4 can be semicircular, circular, triangular or square, etc., preferably semicircular.

[0038] In some embodiments, the windshield material can be plastic, glass, metal, etc., preferably acrylic.

[0039] In some embodiments, the connecting tube may be made of plastic or glass, etc., to facilitate the serial connection of adjacent buffer bottles 6 .

[0040] In some embodiments, a first tail gas channel is formed between the buffer structure and the air inlet of the tail gas pipe of the thermogravimetric analyzer, and a second tail gas channel is formed between the buffer structure and the tail gas outlet; along the flow direction of the tail gas, the distance for the tail gas to flow through the first tail gas channel is greater than the distance for the tail gas to flow through the second tail gas channel. The buffer structure is arranged at a position close to the tail gas outlet of the tail gas outlet pipe 7, so that the buffer structure can better play a buffering role and reduce the fluctuations in the thermogravimetric curve. Further, in the case where the tail gas pipe extends to the prefabricated hole position of the thermogravimetric analyzer, the length of the tail gas outlet pipe 7 between the buffer structure and the tail gas outlet is less than the length of the tail gas inlet pipe 5 between the buffer structure and the tail gas pipe of the thermogravimetric analyzer.

[0041] In some embodiments, the supporting device also includes an exhaust gas purification device, which is arranged between the exhaust pipe of the thermogravimetric analyzer and the buffer structure, the exhaust gas inlet of the exhaust gas purification device is connected to the exhaust pipe of the thermogravimetric analyzer, and the exhaust gas outlet of the exhaust gas purification device is connected to the air inlet of the buffer bottle 6 of the buffer structure. The exhaust gas mainly includes organic solvents and harmful gases produced by thermal decomposition. The exhaust gas purification device can purify the exhaust gas, purify the indoor environment, and reduce the exposure risk of the detection personnel. And the exhaust gas purification device and the exhaust gas buffer device work together to improve the buffering effect on the outdoor airflow, improve the accuracy of the detection results, and improve the reproducibility of the measurement results.

[0042] In the case where the buffer structure includes at least two buffer bottles, the exhaust gas outlet of the exhaust gas purification device is connected to the air inlet of the buffer bottle 6 at the most upstream of the buffer structure.

[0043] like Figure 5 As shown, in some embodiments, the exhaust gas purification device includes a pre-adsorption tube 8, a hydrocarbon trap 10 and an adsorption saturation indicator tube 11 connected in series, the exhaust gas inlet of the pre-adsorption tube 8 is connected to the exhaust pipe of the thermogravimetric analyzer, and the exhaust gas outlet of the adsorption saturation indicator tube 11 is connected to the air inlet of the buffer bottle 6 of the buffer structure. A reducing ferrule 9 can be provided on the pipe connecting the exhaust gas outlet of the pre-adsorption tube 8 and the exhaust gas inlet of the hydrocarbon trap 10, and a reducing ferrule 9 can be provided on the pipe connecting the exhaust gas outlet of the pre-adsorption tube 8 and the exhaust gas inlet of the hydrocarbon trap 10, and a reducing ferrule 9 can be provided on the pipe connecting the exhaust gas outlet of the adsorption saturation indicator tube 11.

[0044] In the case where the buffer structure includes at least two buffer bottles, the tail gas outlet of the adsorption saturation indicator tube 11 is connected to the gas inlet of the buffer bottle 6 at the most upstream of the buffer structure.

[0045] Furthermore, the interior of the pre-adsorption tube 8 is filled with activated carbon solid material to pre-adsorb the gaseous substances released during the detection process of the thermogravimetric analyzer.

[0046] Furthermore, the interior of the hydrocarbon trap 10 is filled with activated carbon to further effectively adsorb harmful gases such as alkanes, ketones, alcohols, esters, and benzene.

[0047] Furthermore, the adsorption saturation indicator tube 11 is filled with adsorbents such as copper oxide, manganese dioxide, calcium oxide, and organophilic clay to indicate whether the active pre-adsorption tube 8 and the hydrocarbon trap 10 need to be replaced to ensure the use efficiency.

[0048] The cooperation of the pre-adsorption tube 8, the hydrocarbon trap 10 and the adsorption saturation indicator tube 11 of the tail gas purification device can effectively purify the tail gas generated by the thermogravimetric analyzer during the detection process.

[0049] like Figure 3 As shown, in some embodiments, when the buffer structure includes at least two buffer bottles, the buffer structure further includes a fixing rod 12, and the fixing rod 12 is connected to two adjacent buffer bottles 6 to fix the buffer bottle 6. The fixing rod 12 can fix the buffer bottle 6, thereby improving the stability of the buffer bottle 6 under the action of outdoor airflow.

[0050] In some embodiments, the buffer bottle 6 is made of plastic, glass, or metal, preferably glass.

[0051] In some embodiments, the buffer bottle 6 is cylindrical. The bottom inner diameter of the cylindrical buffer bottle 6 is 50-100 mm, preferably 80 mm; the height is 100-200 mm, preferably 150 mm. It can play a better buffering role

[0052] like Figure 3 As shown, in some embodiments, the buffer structure further includes a buffer bottle protection box 13, and the buffer bottle 6 is disposed in the buffer bottle protection box 13. The buffer bottle protection box 13 provides a space for accommodating the buffer bottle 6.

[0053] like Figure 2 As shown, in some embodiments, the wind shield includes a door body and a main body, the main body is provided with an operation port, the door body is arranged at the position of the operation port, and the door body can move relative to the main body to close or open the operation port. The operator can operate the thermogravimetric analyzer through the operation port, and can also close the operation port through the door body to prevent the thermogravimetric analyzer from being affected by the indoor airflow. The door body can be a single door or a double door. The operation port of the main body is arranged at the top, side or corner of the main body.

[0054] The door body is connected to the main body by a hydraulic rod 3, and the door body is operated to move relative to the main body by the hydraulic rod 3. A door handle 2 can be provided on the door body, and a lock 1 can also be provided on the door body so that the combination of the door body and the main body is more stable.

[0055] In some embodiments, the number of buffer bottles 6 is 1 to 7, preferably 5 buffer bottles 6. By selecting an appropriate number of buffer bottles 6 connected in series, the airflow buffering effect of the buffer bottles 6 can reduce the fluctuation of the thermogravimetric curve.

[0056] In some embodiments, the air inlet of the buffer bottle 6 is arranged at the top of the buffer bottle 6, and the air outlet of the buffer bottle 6 is arranged at the bottom of the buffer bottle 6. The buffer bottle 6 is cylindrical, and the air outlets are respectively arranged at the top and bottom of the buffer bottle 6 to improve the buffering effect of the buffer bottle 6.

[0057] The present invention also provides a thermogravimetric analyzer, which includes a matching device of the thermogravimetric analyzer of any embodiment of the present application. The matching device can improve the stability and accuracy of the results of the thermogravimetric analyzer.

[0058] Example 1

[0059] This embodiment provides a tail gas buffer device for a thermogravimetric analyzer to improve airflow stability. The structure of the supporting device of the thermogravimetric analyzer: the wind shield is arranged on the thermogravimetric analyzer, the tail gas buffer device is connected to the tail gas pipe of the thermogravimetric analyzer, and there is no tail gas purification device.

[0060] Test conditions: starting temperature 30°C, heating to 800°C at a heating rate of 20°C / min, maintaining at 800°C for 20 min, using air as purge gas (60 mL / min) and nitrogen as protective gas (20 mL / min).

[0061] Test method: Take an empty crucible for thermogravimetric testing, use a thermogravimetric analyzer to measure under the above test conditions, record the thermogravimetric curve, and use the opening and closing of the laboratory door as a disturbance factor during the test.

[0062] Test results: Figure 4 The thermogravimetric curve of an empty crucible under the same heating conditions is shown, and the vertical axis TG represents the mass loss. Figure 4 It can be seen that when the laboratory door was opened and closed, the thermogravimetric curve without the exhaust buffer device showed fluctuations at two points. The fluctuation mass of the first fluctuation point was 0.0495 mg (mass change in the figure), and the fluctuation mass of the second fluctuation point was 0.0619 mg. The conventional thermogravimetric test sample dosage is about 2-5 mg, so the opening and closing of the door may have a 1%-3% impact on the sample test results. Synchronous testing found that the use of the exhaust buffer device can effectively avoid the impact of the opening and closing door vibration on the thermogravimetric curve.

[0063] Example 2

[0064] This embodiment provides the purification efficiency of the exhaust gas purification device of the thermogravimetric analyzer. The structure of the supporting device of the thermogravimetric analyzer: the wind shield is arranged on the thermogravimetric analyzer, the exhaust gas purification device is connected to the exhaust pipe of the thermogravimetric analyzer, and the exhaust gas purification device is connected to the exhaust gas buffer device.

[0065] Thermogravimetric analysis test conditions: starting temperature 30 °C, heating to 400 °C at a heating rate of 20 K / min, nitrogen as purge gas and protective gas (20 mL / min)

[0066] Headspace GCMS (gas phase) chromatography conditions: a capillary column with 6% cyanopropylphenyl-94% dimethylpolysiloxane (or similar polarity) as the stationary liquid is used as the chromatographic column; the column temperature is 40°C, maintained for 5 minutes, increased to 250°C at a rate of 30°C per minute, and maintained for 5 minutes; the injection port temperature is 240°C; the constant flow rate is 2mL / min; the split ratio is 10:1; the FID temperature is 260°C; the MSD ion source temperature is 230°C; the headspace bottle equilibrium temperature is 220°C; the equilibrium time is 20 minutes; the quantitative loop temperature is 230°C; the transfer line temperature is 240°C; the injection volume is 1000μL.

[0067] Experimental procedures

[0068] Step 1: Take 3 different types of compounds and perform thermogravimetric testing under the above test conditions.

[0069] Step 2: Use aged Tenax-TA (2,6-dibenzofuran porous polymer resin) adsorbent to fill a glass tube with two ends open, and insert it into the exhaust pipe of the exhaust purification device to adsorb organic impurities in the exhaust gas.

[0070] Step 3: After the sample determination is completed, remove the glass tube containing the Tenax-TA adsorbent, pour the Tenax-TA adsorbent into the headspace bottle, and seal it.

[0071] Step 4: When the exhaust gas purification device is not used, repeat steps 1, 2, and 3 to obtain two headspace bottles filled with Tenax-TA adsorbent, and use headspace gas chromatography to measure them respectively, and record FID and MS graphs respectively. Figure 6 shown.

[0072] Step 5: Use the NIST library configured in the MS to conduct qualitative analysis on the detected chromatographic peaks and obtain Figure 6 The results shown, Figure 6 The ordinate represents the peak height, through Figure 6 Can determine what harmful substances are present in the exhaust gas. Figure 6 The curve corresponding to the TG exhaust gas test result before using the exhaust gas purification device indicates: the supporting equipment of the thermogravimetric analyzer includes a wind shield and an exhaust gas buffer device, and the test result is not included without the exhaust gas purification device. Figure 6In the chromatographic peak 1, trimethylamine is represented, chromatographic peak 2 is represented, ethanol is represented, chromatographic peak 3 is represented, 3-methylfuran is represented, chromatographic peak 4 is represented, 2,3-butanedione is represented, chromatographic peak 5 is represented, 2-butanone is represented, chromatographic peak 6 is represented, ethyl acetate is represented, chromatographic peak 7 is represented, tetrahydrofuran is represented, chromatographic peak 8 is represented, benzene is represented, n-heptane is represented, chromatographic peak 10 is represented, ethylbenzene is represented, o-xylene is represented, chromatographic peak 12 is represented, p-xylene is represented, chromatographic peak 13 is represented, trimethyl phosphate is represented, chromatographic peak 14 is represented, phenol is represented, and chromatographic peak 15 is represented, benzoic acid is represented.

[0073] Figure 6 The TG tail gas detection result curve after using the tail gas purification device shows the detection result when the supporting devices of the thermogravimetric analyzer include a wind shield, a tail gas buffer device and a tail gas purification device. Through this curve, it can be seen that after the tail gas purification device is applied, the toxic and harmful substances in the tail gas are basically adsorbed. Therefore, the tail gas purification device can effectively protect the environment and reduce the exposure risk of the detection personnel.

[0074] Step 6: The exhaust gas purification efficiency can be calculated by comparing the peak areas of the detected impurities.

[0075] The above description is intended to be illustrative rather than restrictive, and those skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure. Moreover, the above examples (or one or more of them) may be used in combination with each other, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations.

Claims

1. A supporting device for a thermogravimetric analyzer, characterized in that: The supporting device comprises: A windshield, which is arranged on the outside of the thermogravimetric analyzer; An exhaust gas buffer device comprises an exhaust gas inlet pipe, an exhaust gas outlet pipe and a buffer structure, wherein the buffer structure comprises a buffer bottle, the first end of the exhaust gas inlet pipe is connected to the exhaust pipe of the thermogravimetric analyzer, the buffer bottle is provided with an air inlet and an air outlet, the second end of the exhaust gas inlet pipe is connected to the air inlet of the buffer bottle, the air outlet of the buffer bottle is connected to the exhaust gas outlet pipe, and the exhaust gas outlet of the exhaust gas outlet pipe is connected to the outdoors.

2. The supporting device of the thermogravimetric analyzer according to claim 1, characterized in that: A first exhaust gas channel is formed between the buffer structure and the air inlet of the exhaust pipe of the thermogravimetric analyzer, and a second exhaust gas channel is formed between the buffer structure and the exhaust gas outlet; along the flow direction of the exhaust gas, the distance provided by the first exhaust gas channel for the exhaust gas to flow is greater than the distance provided by the second exhaust gas channel for the exhaust gas to flow.

3. The supporting device of the thermogravimetric analyzer according to claim 1, characterized in that: The supporting device also includes an exhaust gas purification device, which is arranged between the thermogravimetric analyzer and the buffer structure. The exhaust gas inlet of the exhaust gas purification device is connected to the exhaust pipe of the thermogravimetric analyzer, and the exhaust gas outlet of the exhaust gas purification device is connected to the air inlet of the buffer bottle of the buffer structure.

4. The supporting device of the thermogravimetric analyzer according to claim 3, characterized in that: The exhaust gas purification device includes a pre-adsorption tube, a hydrocarbon trap and an adsorption saturation indicator tube connected in series in sequence, the exhaust gas inlet of the pre-adsorption tube is connected to the exhaust pipe of the thermogravimetric analyzer, and the exhaust gas outlet of the adsorption saturation indicator tube is connected to the air inlet of the buffer bottle of the buffer structure.

5. The supporting device of the thermogravimetric analyzer according to claim 1, characterized in that: In the case that the buffer structure includes at least two buffer bottles, the buffer structure further includes a fixing rod, and the fixing rod is connected to two adjacent buffer bottles to fix the buffer bottles.

6. The supporting device of the thermogravimetric analyzer according to claim 1, characterized in that: The buffer structure also includes a buffer bottle protection box, and the buffer bottle is arranged in the buffer bottle protection box.

7. The supporting device of the thermogravimetric analyzer according to claim 1, characterized in that: The wind shield comprises a door body and a main body, an operation port is arranged on the main body, the door body is arranged at the position of the operation port, and the door body can move relative to the main body to close or open the operation port.

8. The supporting device of the thermogravimetric analyzer according to claim 1, characterized in that: The number of the buffer bottles is 1 to 7.

9. The supporting device of the thermogravimetric analyzer according to claim 1, characterized in that: The air inlet of the buffer bottle is arranged at the top of the buffer bottle, and the air outlet of the buffer bottle is arranged at the bottom of the buffer bottle.

10. A thermogravimetric analyzer, characterized in that: The thermogravimetric analyzer comprises the supporting device as described in any one of claims 1-9.

Images