CN112326497A - Device and method for measuring volatilization rate of volatile organic compounds - Google Patents
Device and method for measuring volatilization rate of volatile organic compounds Download PDFInfo
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- CN112326497A CN112326497A CN202011277495.4A CN202011277495A CN112326497A CN 112326497 A CN112326497 A CN 112326497A CN 202011277495 A CN202011277495 A CN 202011277495A CN 112326497 A CN112326497 A CN 112326497A
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 238000005303 weighing Methods 0.000 claims abstract description 17
- 238000009423 ventilation Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims 4
- 238000001704 evaporation Methods 0.000 claims 4
- 230000008859 change Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 42
- 239000000126 substance Substances 0.000 description 14
- 239000012459 cleaning agent Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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Abstract
The invention discloses a volatile organic compound volatilization rate measuring device and a volatile organic compound volatilization rate measuring method, wherein the volatile organic compound volatilization rate measuring device comprises a constant temperature box for providing a constant temperature environment, a volatilization cavity arranged in the constant temperature box and used for placing volatile organic compounds therein, and a weighing mechanism arranged in the volatilization cavity and used for measuring the quality of the volatile organic compounds; an air inlet pipe which penetrates out of the constant temperature box and is used for connecting an air source and an exhaust pipe which penetrates out of the constant temperature cavity are arranged on the volatilization cavity; intake pipe, volatile chamber and blast pipe communicate in proper order, form the gas flow path, do volatile organic compounds in the volatile chamber provide the ventilation environment. The volatile organic compound volatilization rate measuring device provides a ventilation environment simulating a ventilation state for volatile organic compounds, and obtains the volatilization rate of the volatile organic compounds by combining time and measuring the mass change of the volatile organic compounds. Simple structure, simple operation.
Description
Technical Field
The invention relates to a volatile organic compound measuring device, in particular to a volatile organic compound volatilization rate measuring device and method.
Background
The rate of volatilization of chemicals, such as volatile organics, has a significant impact on the accumulation of the chemical in a confined space and the residue of the chemical in the environment after its application. Temperature and air flow rate are two key factors that determine the rate of volatilization of the chemical. In industrial enterprises of interest, the concentration of chemicals in a space has a significant impact on the health of workers and the potential risk of fire. Therefore, in order to control the use of chemicals and the usage rules of the related chemicals in a limited space, the volatilization rates of the related chemicals are measured, and the obtained data is used for managing the related operation flow.
The volatilization rate of chemicals is one of the key physicochemical properties and is one of the important parameters in engineering practice. At present, the volatilization test of chemicals mainly measures the volatilization characteristics of organic chemicals in a closed system by using an online gas chromatograph, the volatilization time and the volatilization rate of the chemicals in a simulated ventilation state cannot be measured, and no convenient instrument and equipment can be used for quantitatively measuring the volatilization rate of the chemicals in the simulated ventilation state. Therefore, it is important to develop a device and a method for measuring the volatilization rate of chemicals under specific temperature and space velocity conditions.
Disclosure of Invention
The invention aims to provide a volatile organic compound volatilization rate measuring device and a volatile organic compound volatilization rate measuring method capable of simulating a ventilation state.
The technical scheme adopted by the invention for solving the technical problems is as follows: the volatile organic compound volatilization rate measuring device comprises a constant temperature box for providing a constant temperature environment, a volatilization cavity arranged in the constant temperature box and used for placing volatile organic compounds therein, and a weighing mechanism arranged in the volatilization cavity and used for measuring the quality of the volatile organic compounds;
an air inlet pipe which penetrates out of the constant temperature box and is used for connecting an air source and an exhaust pipe which penetrates out of the constant temperature cavity are arranged on the volatilization cavity; intake pipe, volatile chamber and blast pipe communicate in proper order, form the gas flow path, do volatile organic compounds in the volatile chamber provide the ventilation environment.
Preferably, said volatilization chamber is formed by a visually closed container placed inside said oven.
Preferably, the visual closed container is a glass box body.
Preferably, the volatile organic compound volatilization rate measuring device further comprises a gas mass flow meter arranged on the gas inlet pipe.
Preferably, the volatile organic compound volatilization rate measuring device further comprises a data acquisition unit;
the weighing mechanism is connected with the data acquisition unit and is used for sending the measured mass information of the volatile organic compounds to the data acquisition unit; the gas mass flow meter is connected with the data acquisition unit and sends the measured gas flow information to the data acquisition unit.
Preferably, the volatile organic compound volatilization rate determination device further comprises a temperature measurement unit arranged in the volatilization cavity; the temperature measuring unit is connected with the data acquisition unit and sends the measured temperature information in the volatilization cavity to the data acquisition unit.
Preferably, the volatile organic compound volatilization rate measuring device further comprises a gas adsorption device connected with the exhaust pipe.
Preferably, the gas adsorption means comprises an activated carbon column.
The invention also provides a volatile organic compound volatilization rate measuring method, which adopts the volatile organic compound volatilization rate measuring device and comprises the following steps:
s1, setting the temperature of the incubator, placing the volatile organic compounds on a weighing mechanism in the volatilization cavity, and recording the initial mass of the volatile organic compounds;
s2, introducing gas into the volatilization cavity according to a set gas flow;
s3, recording the mass of the volatile organic compounds according to the set volatilization time;
and S4, calculating and obtaining the volatilization rate of the volatile organic compound according to the mass difference and the volatilization time of the volatile organic compound.
Preferably, the temperatures and/or gas flow rates of a plurality of different incubators are set, and the steps S1-S4 are repeated in sequence to obtain the volatilization rates of the volatile organic compounds at a plurality of different temperatures and/or gas flow rates.
The volatile organic compound volatilization rate measuring device provides a ventilation environment simulating a ventilation state for volatile organic compounds, and obtains the volatilization rate of the volatile organic compounds by combining time and measuring the mass change of the volatile organic compounds. Simple structure, simple operation.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram showing the connection of a volatile organic compound volatilization rate measuring apparatus according to the present invention;
FIG. 2 is a graph plotting cleaning agent volatilization rate data for inventive example 1.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the apparatus for measuring the volatilization rate of volatile organic compounds according to the present invention comprises an oven 10 for providing a constant temperature environment, a volatilization chamber 20 for providing a space for placing the volatile organic compounds, and a weighing mechanism 30 for measuring the amount of the volatile organic compounds.
The volatilization cavity 20 is arranged in the incubator 10 and is not communicated with the incubator. The weighing mechanism 30 is arranged in the volatilization cavity 20, and the volatile organic compounds are placed on the weighing mechanism 30 in the volatilization cavity 20, so that the weighing mechanism 30 can measure the mass of the volatile organic compounds in real time.
Wherein, be equipped with intake pipe 21 and blast pipe 22 on the chamber 20 that volatilizees, intake pipe 21 wears out thermostated container 10 in order to connect air supply 1, and it lets in gases such as air for volatilizing chamber 20 through the air supply. Exhaust pipe 22 wears out thermostated container 10 in order to discharge gas to intake pipe 21, volatile chamber 20 and exhaust pipe 22 communicate in proper order, form the gas circulation passageway, through the external ventilation state of the flow simulation of gaseous, provide the ventilation environment for the volatile organic compounds in the volatile chamber 20 that volatilizees.
Alternatively, volatilization chamber 20 can be formed by any container placed within oven 10. Preferably, the volatilization chamber 20 is formed by a visually-enclosed container placed inside the oven 10, facilitating the observation of the conditions inside the volatilization chamber 20 by the measurement personnel. The visual closed container can be a transparent or semitransparent box body such as a glass box body.
The flow of the gas input into the volatilization cavity 20 through the control gas source 1 simulates the condition of specific airspeed to create different ventilation states. The air source 1 can be an air steel cylinder, or a small fresh air source, a compression pump or an air pump.
In order to control and monitor the flow of the gas introduced into the volatilization cavity 20, the volatile organic compound volatilization rate measuring device further comprises a gas mass flow meter 40 arranged on the gas inlet pipe 21. The gas flow into the volatilization cavity 20 is obtained in real time through monitoring of the gas mass flow meter 40, and real-time adjustment is facilitated.
The volatile organic compound volatilization rate measuring device further comprises a temperature measuring unit 50 arranged in the volatilization cavity 20 and used for measuring the temperature in the volatilization cavity 20, obtaining more accurate volatilization measurement temperature conditions and being convenient for monitoring the volatilization measurement temperature. The temperature measuring unit 50 may be a temperature sensor or a thermometer, etc.
Further, the apparatus for measuring the volatilization rate of volatile organic compounds according to the present invention further comprises a data acquisition unit 60. The weighing mechanism 30 is connected to the data acquisition unit 60, and transmits the measured mass information of the volatile organic compounds to the data acquisition unit 60. The gas mass flow meter 40 is connected to the data acquisition unit 60, and transmits the measured gas flow rate information to the data acquisition unit 60. The temperature measuring unit 50 is connected with the data acquisition unit 60, and transmits the measured temperature information in the volatilization cavity 20 to the data acquisition unit 60.
The data acquisition unit 60 may be implemented by a computer or other control terminal, and acquires mass data of temperature, gas flow rate and volatile organic compounds, and adjusts and controls the gas flow rate.
The mass information of the volatile organic compounds sent by the weighing mechanism 30, the gas flow information sent by the gas mass flowmeter 40, and the temperature information sent by the temperature measuring unit 50, etc. may be collected by the data acquisition card 61, and then sent to the processing center of the data acquisition unit 60 for processing and displaying, etc.
In addition, the gas exhausted from the exhaust pipe 22 of the volatilization chamber 20 contains volatile organic compounds, so that the volatile organic compound volatilization rate measuring device of the invention can further comprise a gas adsorption device 70 connected with the exhaust pipe 22 in order to prevent the exhausted gas from polluting the environment or damaging human bodies. The gas adsorbing device 70 adsorbs the volatile organic compounds in the gas zone supplied thereto, and then discharges them.
Alternatively, the gas adsorption device 70 may include an activated carbon column. ,
the method for measuring the volatilization rate of the volatile organic compounds adopts the device for measuring the volatilization rate of the volatile organic compounds, and referring to fig. 1, the method for measuring the volatilization rate of the volatile organic compounds can comprise the following steps:
s1, setting the temperature of the oven 10, placing the volatile organic compounds on the weighing mechanism 30 in the volatilization chamber 20, and recording the initial mass of the volatile organic compounds.
It will be appreciated that the volatile organic compounds are placed on the weighing mechanism 30 in a state contained in a volatilization vessel.
And S2, introducing the gas into the volatilization cavity 20 according to the set gas flow.
After being conveyed into the volatilization cavity 20 according to the set gas flow, the gas is output outwards through the exhaust pipe 22 to form gas flow, so that a ventilation state is formed in the volatilization cavity 20.
And S3, recording the mass of the volatile organic compounds according to the set volatilization time.
The set volatilization time can be one or more time points.
Since the volatile organic compounds are placed on the weighing mechanism 30 in the volatilization chamber 20, the weighing mechanism 30 can continuously measure the mass of the volatile organic compounds in real time.
And after the mass of the volatile organic compounds is measured in the set volatilization time, the mass of the volatile organic compounds is compared with the initial mass of the volatile organic compounds, and the mass difference between the mass of the volatile organic compounds and the initial mass of the volatile organic compounds is the mass of the volatilized part of the volatile organic compounds.
And S4, calculating and obtaining the volatilization rate of the volatile organic compounds according to the mass difference and the volatilization time of the volatile organic compounds.
In the above-described measuring method, the temperatures and/or gas flow rates of a plurality of different incubators 10 are set, and steps S1 to S4 are sequentially repeated to obtain the volatilization rates of the volatile organic compounds at a plurality of different temperatures and/or gas flow rates.
The present invention is further illustrated by the following specific examples.
Adding 1.45g of the Welch cleaning agent into a volatilization vessel with the diameter of 6.5cm, placing the vessel in a thermostat, keeping the temperature at 30 ℃, setting the flow rate of a gas mass flow meter at 500mL/min, measuring the mass of the Welch cleaning agent in real time, and calculating to obtain the volatilization rate of the Welch cleaning agent.
The relationship between the volatilization rates of the Wickel cleaner and the time at the holding temperatures of 35 ℃ and 40 ℃ was repeatedly measured, and the data obtained were plotted as shown in FIG. 2, in which curves 1, 2, and 3 are measured at the temperatures of 40 ℃, 35 ℃ and 30 ℃, respectively. The data obtained were fitted using the volatilization model, the fitting equation of which is shown in fig. 2, and the correlation R2 of which is 0.999, indicating that the data obtained are highly reflective of the volatilization rate and highly accurate.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A volatile organic compound volatilization rate measuring device is characterized by comprising a constant temperature box for providing a constant temperature environment, a volatilization cavity arranged in the constant temperature box and used for placing volatile organic compounds therein, and a weighing mechanism arranged in the volatilization cavity and used for measuring the quality of the volatile organic compounds;
an air inlet pipe which penetrates out of the constant temperature box and is used for connecting an air source and an exhaust pipe which penetrates out of the constant temperature cavity are arranged on the volatilization cavity; intake pipe, volatile chamber and blast pipe communicate in proper order, form the gas flow path, do volatile organic compounds in the volatile chamber provide the ventilation environment.
2. The apparatus of claim 1, wherein the volatilization chamber is formed by a visually-enclosed container placed within the incubator.
3. The apparatus according to claim 2, wherein the visual airtight container is a glass box.
4. The voc evaporation rate measurement device according to claim 1, further comprising a gas mass flow meter provided in the intake pipe.
5. The voc evaporation rate measurement device according to claim 4, further comprising a data acquisition unit;
the weighing mechanism is connected with the data acquisition unit and is used for sending the measured mass information of the volatile organic compounds to the data acquisition unit; the gas mass flow meter is connected with the data acquisition unit and sends the measured gas flow information to the data acquisition unit.
6. The voc evaporation rate determining apparatus according to claim 5, further comprising a temperature measuring unit disposed in the evaporation chamber; the temperature measuring unit is connected with the data acquisition unit and sends the measured temperature information in the volatilization cavity to the data acquisition unit.
7. The apparatus according to any one of claims 1 to 6, further comprising a gas adsorbing device connected to the exhaust pipe.
8. The apparatus of claim 7, wherein the gas adsorbing device comprises an activated carbon column.
9. A method for measuring a volatilization rate of a volatile organic compound, the method comprising the steps of, using the apparatus for measuring a volatilization rate of a volatile organic compound according to any one of claims 1 to 8:
s1, setting the temperature of the incubator, placing the volatile organic compounds on a weighing mechanism in the volatilization cavity, and recording the initial mass of the volatile organic compounds;
s2, introducing gas into the volatilization cavity according to a set gas flow;
s3, recording the mass of the volatile organic compounds according to the set volatilization time;
and S4, calculating and obtaining the volatilization rate of the volatile organic compound according to the mass difference and the volatilization time of the volatile organic compound.
10. The method of claim 9, wherein the temperatures and/or gas flow rates of the plurality of different incubators are set, and steps S1 to S4 are sequentially repeated to obtain the volatilization rates of the volatile organic compounds at the plurality of different temperatures and/or gas flow rates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011277495.4A CN112326497A (en) | 2020-11-16 | 2020-11-16 | Device and method for measuring volatilization rate of volatile organic compounds |
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| CN202011277495.4A CN112326497A (en) | 2020-11-16 | 2020-11-16 | Device and method for measuring volatilization rate of volatile organic compounds |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984580A (en) * | 2021-10-29 | 2022-01-28 | 上海芬尚生物科技有限公司 | Device and method for determining factors influencing volatilization rate of perfume product |
| CN114236058A (en) * | 2021-12-21 | 2022-03-25 | 杭州麦乐克科技股份有限公司 | Method for detecting volatilization rate of harmful volatile gas in object at low temperature |
| CN115824876A (en) * | 2022-11-07 | 2023-03-21 | 山东大学 | Volatile substance volatilization rate testing device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113984580A (en) * | 2021-10-29 | 2022-01-28 | 上海芬尚生物科技有限公司 | Device and method for determining factors influencing volatilization rate of perfume product |
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| CN114236058B (en) * | 2021-12-21 | 2023-06-20 | 杭州麦乐克科技股份有限公司 | Method for detecting volatilization rate of harmful volatile gas in object at low temperature |
| CN115824876A (en) * | 2022-11-07 | 2023-03-21 | 山东大学 | Volatile substance volatilization rate testing device and method |
| CN115824876B (en) * | 2022-11-07 | 2024-05-31 | 山东大学 | Volatile material volatilization rate testing device and method |
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