KR100620447B1 - Dew point measurement method and device of organic vapor - Google Patents

Abstract

The present invention provides a method and apparatus for measuring dew point in an organic vapor mixture. Dew point measurement method of the organic vapor mixture is to contact the organic vapor mixture on one side of the crystal oscillator sensor and the cooling medium on the other side of the crystal oscillator sensor, and then Measure the temperature. In addition, the dew point measuring device of the organic vapor mixture comprises a chamber, a sensor module, a resonant circuit, a measuring device. The chamber is provided with an organic vapor mixture introduced therein, and an inlet through which the organic vapor mixture is introduced from the outside and an outlet through which the organic vapor mixture is discharged to the outside. The sensor module is installed at one side of the chamber in communication with the chamber such that one side of the crystal oscillator sensor is in contact with the organic vapor mixture contained in the chamber, and a cavity for accommodating the cooling medium such that the cooling medium is in contact with the other side of the crystal oscillator sensor. Is formed. The resonant circuit is connected to the crystal oscillator sensor outside of the chamber. The measuring device is connected to the resonant circuit to measure the response frequency from the crystal oscillator sensor, and is connected to the chamber to measure the pressure and temperature in the chamber.

Description

DEW POINT MEASUREMENT METHOD AND DEVICE OF ORGANIC VAPOR}

1 is a view for explaining a dew point measuring apparatus of an organic vapor mixture according to the present invention;

2 is a view showing a sensor module using a crystal oscillator sensor applied to the dew point measuring method and apparatus of the organic vapor mixture of the present invention;

3 is a view for explaining the main configuration of the dew point measuring device of the organic vapor mixture according to a preferred embodiment of the present invention;

4 is a view for explaining a dew point measuring apparatus of an organic vapor mixture using a crystal oscillator sensor according to a preferred embodiment of the present invention;

FIG. 5 is a graph showing the change in pressure and response frequency of the sensor module with respect to the temperature change of the sensor module and the cooling medium in the first experiment using the dew point measuring apparatus of the organic vapor mixture of FIG. 4;

FIG. 6 is a graph showing determination of dew point at an early stage of response frequency drop of a sensor module in a first experiment using the dew point measuring apparatus of the organic vapor mixture of FIG. 4;

7 is a graph showing a change in pressure and response frequency of a sensor module with respect to a temperature change of a sensor module and a cooling medium in a second experiment using the dew point measuring apparatus of the organic vapor mixture of FIG. 4;

FIG. 8 is a graph illustrating determination of a dew point at an initial stage of a response frequency drop of a sensor module in a second experiment using the dew point measuring device of FIG. 4.

Explanation of symbols on the main parts of the drawings

10, 100: dew point measuring device (of organic vapor mixture)

20: chamber 20 ': T pipe

22: inlet 22 ': socket

24: outlet 24 ': fitting

26: discharge valve 30: sensor module

32: crystal oscillator sensor 34: cavity

35 housing 36 inner plate

38: outer plate 39: O-ring

40: resonant circuit 50: measuring instrument

52: first thermometer 53, 55, 57: temperature indicator

54: Second Thermometer 56: Third Thermometer

58: pressure gauge 60: A / D converter

62: Computer 70: No. 1 Thermostat

74: second thermostat 75: micro pump

The present invention relates to a method and apparatus for measuring dew point of an organic vapor mixture using a crystal oscillator sensor, and more specifically, using a crystal oscillator sensor for gas-liquid equilibrium data, which is important for designing a separation process by contact between a gas and a liquid. The present invention relates to a dew point measurement method and apparatus for an organic vapor mixture using a crystal oscillator sensor.

Gas-liquid equilibrium data is indispensable for the design of separation devices that typically involve gas-liquid contact. Although many commercial databases for the prediction of thermodynamic information are useful in this regard, the information predicted from such databases needs to be verified by experimental measurements. Moreover, many researchers have found that these databases are not useful for many mixtures.

Dew point is one of the gas-liquid equilibrium data, and the dew point measuring device has been proposed in various forms for gas-liquid equilibrium measurement. However, although vapor dew point measuring devices are commercially useful in meteorological systems, they are not suitable for dew point measurement of organic vapor mixtures. In other words, the condensation of organic vapor causes a change in the composition of the sample vapor due to the difference between the vapor and liquid composition, so the measurement of gas condensation requires a precision that does not change the vapor composition by monitoring the condensation initiation.

Meanwhile, the inventor measures the supersaturation of the mother liquor which can effectively measure the supersaturation of the mother liquor during the crystallization process by applying a crystal oscillator sensor through the Korean Patent Application No. 10-2005-0017876 "Method and apparatus for measuring the supersaturation of the mother liquor". A method and apparatus have been proposed. Such a method and apparatus for measuring the supersaturation of the mother liquor can reduce the occurrence of errors due to small fluctuations as much as possible, thereby measuring the exact supersaturation degree, and in-line the crystallization process for producing a crystal product through a very simple configuration. It has the advantage of measuring supersaturation of mother liquor.

Accordingly, an object of the present invention is to provide a method and apparatus for measuring dew point of an organic vapor mixture using a new type of crystal oscillator sensor in view of the fact that the present inventor has obtained an excellent effect by applying a crystal oscillator sensor in measuring the supersaturation degree of mother liquor. It is done.

In particular, it is an object of the present invention to provide a method and apparatus for measuring dew point of an organic vapor mixture using a new type of crystal oscillator sensor which can provide an accuracy that does not change the vapor composition by monitoring the start of measurement.

In another aspect, the present invention provides a method and apparatus for measuring dew point of an organic vapor mixture of a new type capable of measuring in-line response frequency output from the crystal oscillator sensor during the condensation in measuring the dew point of the organic vapor mixture. For the purpose of

According to a feature of the present invention for achieving the above object, in the dew point measuring method of the organic vapor mixture, the organic vapor mixture is in contact with one side of the crystal oscillator sensor and the cooling medium is in contact with the other side To make; The temperature of the organic vapor mixture at the time point at which condensation of gas occurs on the surface of the crystal oscillator sensor is measured.

In the dew point measurement method of the organic vapor mixture according to the present invention, the time point at which the condensation of gas occurs on the surface of the crystal oscillator sensor is measured by measuring a change in the response frequency output from the crystal oscillator sensor.

In the dew point measuring method of the organic vapor mixture according to the present invention, the step of contacting the organic vapor mixture on one side of the crystal oscillator sensor and contacting the cooling medium on the other side is a sensor module installed with the crystal oscillator sensor It is made to maintain a constant temperature through the first thermostat and then circulating by controlling the temperature of the cooling medium through the second thermostat.

According to a feature of the present invention for achieving the above object, the present invention is a dew point measuring apparatus of the organic vapor mixture, the organic vapor mixture is accommodated, the organic vapor mixture is introduced from the outside and the organic vapor to the outside inlet A chamber in which an outlet through which the mixture is discharged is formed; One side of the crystal oscillator sensor is installed on one side of the chamber in communication with the chamber to be in contact with the organic vapor mixture contained in the chamber, to accommodate the cooling medium so that the cooling medium is in contact with the other side of the crystal oscillator sensor A sensor module having a cavity formed therein; A resonance circuit connected to the crystal oscillator sensor outside of the chamber; And a measuring device connected to the resonant circuit to measure a response frequency from the crystal oscillator sensor, and connected to the chamber to measure pressure and temperature in the chamber.

In the apparatus for measuring dew point of an organic vapor mixture according to the present invention, the chamber and the sensor module are installed in a first thermostat for temperature control, and a cooling medium accommodated in the cavity is installed outside the first thermostat. Temperature can be controlled and circulated in the thermostat.

In the dew point measuring apparatus of the organic vapor mixture according to the present invention, the measuring device is coupled to the chamber for measuring the pressure in the chamber; A first thermometer coupled to the chamber for measuring a temperature in the chamber; A second thermometer for measuring the temperature in the first thermostat for controlling the temperature of the chamber; A third thermometer for measuring the temperature of the cooling medium supplied into the cavity; The computer may be connected to the resonant circuit, the pressure gauge, and the first to third thermometers to receive and process data received by digitally inputting the respective values.

The present invention provides a method and apparatus for measuring dew point of an organic vapor mixture using a crystal oscillator sensor. The crystal oscillator sensor can monitor phase changes in many processes as well as mass changes on the sensor surface. The crystal oscillator sensor can measure changes in nanograms. Mass gain due to adsorption of organic vapor was measured as a crystal oscillator sensor coated with activated carbon. Phase change in the liquid-solid system was measured when solid crystals formed on the crystal oscillator surface.

The present inventors have fabricated a dew point measuring apparatus for an organic vapor mixture using a crystal oscillator sensor using a material which can be easily used as a preferred embodiment of the present invention described below, and the performance of the dew point measuring apparatus for an organic vapor mixture is different. The acetone-methanol mixture with pressure and composition was tested by in-line measurements and compared with the results predicted from the UNIQUAC equations.

The dew point measuring method of the organic vapor mixture according to the present invention measures the dew point of the organic vapor mixture from the response frequency output from the crystal oscillator sensor according to the temperature change of the cooling medium in measuring the dew point of the organic vapor mixture.

Since the dew point measuring method and apparatus of the organic vapor mixture according to the present invention uses a crystal oscillator sensor, the dew point of the organic vapor mixture can be measured in-line without interruption of the manufacturing process, and in measuring dew point of the organic vapor mixture, More accurate measurements are possible.

1 is a view for explaining a dew point measuring apparatus of an organic vapor mixture according to the present invention, Figure 2 is a view showing a sensor module using a crystal oscillator sensor applied to the dew point measuring method and apparatus of the organic vapor mixture of the present invention. .

1 and 2, the dew point measuring apparatus 10 of the organic vapor mixture according to the present invention is fixed to the chamber 20, the crystal oscillator sensor 32 is accommodated in the chamber 20, the organic vapor mixture is introduced into the chamber 20 And a sensor module 30 coupled to the sensor module 30, a resonant circuit 40 connected to the crystal oscillator sensor 32 outside the chamber 20, and a measuring device 50 for outputting the dew point of the organic vapor mixture. At this time, the chamber 20 is formed with an inlet 22 through which the organic vapor mixture flows from the outside and an outlet 24 through which the organic vapor mixture is discharged to the outside. The sensor module 30 is installed on one side of the chamber 20 in communication with the chamber 20 such that one side of the crystal oscillator sensor 32 is in contact with the organic vapor mixture contained in the chamber 20, and the crystal oscillator sensor ( The cavity 34 for receiving the cooling medium is formed on the other side of the 22 to contact the cooling medium. The resonant circuit 40 generates an electrical signal for measuring the frequency. The measuring device 50 is connected to the resonant circuit 40 to measure the response frequency from the crystal oscillator sensor 32, and is connected to the chamber 20 to measure the pressure and temperature in the chamber 20.

Meanwhile, the sensor module 30 applied to the present invention has a structure substantially similar to that of the sensor module 30 proposed by the inventor in Korean Patent Application No. 10-2005-0017876, "Method and apparatus for measuring the supersaturation degree of mother liquor". With this, the sensor module 30 maintains the crystal oscillator sensor 32 stably, and effectively seals the organic vapor mixture and the cooling medium filled on both sides of the crystal oscillator sensor 32. For example, the sensor module 30 applied to the preferred embodiment of the present invention described below has three polypropylene plates, and the inner plate 36 on the left side of the housing 35 has a diameter of 39 mm and a hole of 4 mm in the center. This is pierced. The right inner plate 36 (center plate) is a square plate of 22 mm in width and 25 mm in length, with a 4 mm hole in the center. These two plates 36 are 2 mm thick and fasten the crystal oscillator sensor 32, and two rubber o-rings 39 are used to fasten the crystal oscillator sensor 32 having a thickness of 0.15 mm and a diameter of 9 mm. When measuring the dew point, as shown in Figure 2, the vapor is in contact with the left side of the crystal oscillator sensor 32, on the contrary, the cooling water as a cooling medium is to be supplied to the right side of the crystal oscillator sensor 32. And the outer plate 38, which is a 3mm thick polypropylene plate having two small nipples, was installed on the right side of the crystal oscillator sensor 32 to form a cavity 34 through which coolant flows. These three plates (the inner plate 36 and the outer plate 38) are assembled with four screw bolts having a diameter of 2.5 mm. The crystal oscillator sensor 32 is an AT-cut crystal oscillator having a basic frequency of 8 MHz, the electrode of the crystal oscillator is silver.

The dew point measuring method of the organic vapor mixture according to the present invention by the dew point measuring device having such a configuration is to make the organic vapor mixture in contact with one side of the crystal oscillator sensor 32 and then the cooling medium in contact with the other side This is achieved by measuring the temperature of the organic vapor mixture at the time of condensation of gas on the surface of the crystal oscillator sensor 32. At this time, when the condensation of gas occurs on the surface of the crystal oscillator sensor 32 is made by measuring the change in the response frequency output from the crystal oscillator sensor 32.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, FIGS. 3 to 8, and like reference numerals denote like elements for performing the same functions in FIGS. 1 to 4. On the other hand, in the drawings, the technical details of the conventional organic vapor mixture and technical details such as known measuring instruments and electronic systems applied for measuring the dew point of the organic vapor mixture, and those skilled in the art will be readily understood. Since parts are to be understood, they are briefly or omitted, and are shown in terms of parts related to the present invention.

3 is a view for explaining the main configuration of the dew point measuring apparatus of the organic vapor mixture according to a preferred embodiment of the present invention, Figure 4 is a dew point measurement of the organic vapor mixture using a crystal oscillator sensor according to a preferred embodiment of the present invention It is a figure for demonstrating an apparatus.

1 to 4, a dew point measuring apparatus 100 for an organic vapor mixture according to an exemplary embodiment of the present invention includes a T tube 20 ′, which is a chamber, and a socket forming an inlet 22 of the organic vapor mixture. 22 '), with a fitting 24' defining the outlet 24. A sensor module 30 with a crystal oscillator sensor 32 as shown in FIG. 2 is mounted on a 1¼-inch T tube 20 '. At this time, the innermost plate 36 of the sensor module 30 was in contact with the T pipe 20 'and sealed on the back with an O-ring and a bushing. The opposite side of the T tube 20 'is connected to the elbow and the inch socket 22' to provide a rubber sealed inlet. The upper part of the T pipe 20 'is provided with a ¼ inch fitting 24' for forming an outlet, and the first thermometer 52 and the pressure for measuring the temperature in the chamber, that is, the T pipe 20 'are installed. A pressure gauge 58 and a discharge valve 26 for measuring are provided.

Referring back to FIG. 4, the dew point measuring apparatus 100 according to a preferred embodiment of the present invention has an advantage of being connected in the process and configured in an inline form. In the dew point measuring device 10, the sensor module 20 is coupled, and the socket 22 'forming the inlet 22 of the organic vapor mixture and the fitting 24' forming the outlet 24 are coupled. The T tube 20 ', which is a chamber, is immersed in the first thermostat 70 to maintain a constant temperature. In addition, the cooling water, which is a cooling medium accommodated in the cavity 34 of the sensor module 20, is circulated by the micro pump 75 having a temperature controlled by the second thermostat 74.

In addition, in the present embodiment, the measuring device 50 includes a first thermometer 52 for measuring the temperature of the organic vapor in the chamber, that is, the T pipe 20 ', and a second for measuring the temperature of the cooling water of the first thermostat 70. The pressure of the organic vapor in the thermometer 54, the third thermometer 56 for measuring the temperature of the cooling medium, the temperature indicators 53, 55, 57 for digitally displaying their temperatures, and the T pipe 20 '. A pressure gauge 58 for measurement, thermometers 52, 54, 56 and an A / D converter 60 for converting the signals of the pressure gauge 58 into digital values, and a computer 62 for processing the collected data. It is made. At this time, the temperature of the steam in the T tube 20 'was measured by a platinum resistance thermometer, and the temperature of the cooling water was measured by installing a small platinum resistance thermometer having a diameter of 0.9 mm and a length of 15 mm in a tube through which the cooling water flows. In the present embodiment, the frequency was measured by a manufactured frequency counter, and the digital signals of the response frequency and the measured temperatures were stored in the computer 62 for later data arrangement.

The dew point measuring method and apparatus of the organic vapor mixture according to the preferred embodiment of the present invention was verified through the following experiment.

First, the dew point measurement of the organic vapor mixture was compared with the predicted dew point obtained using the UNIQUAC equation.

The equivalence coefficient of component i in the gas-liquid mixture at equilibrium is represented by the formula

y _i Φ _i P = x _i γ _i f _i (1)

Where x _i and y _i are the composition of liquid and gas phases of component i, respectively, Φ and f are the fugitive coefficients of gas and liquid phases respectively, and γ is the activity coefficient of the liquid phase calculated by the UNIQUAC equation.

And, an area of the parameter q _i is component i, and r _i is the volume parameter of the component i, a _ij is also dependent parameter rain, b _ij is the temperature-dependent parameters. In equation (1), it is assumed that the gaseous and liquid phase fugases are ideal, and the vapor pressure is calculated by the Antoine equation. Parameters for calculating activity coefficients and vapor pressures were obtained from existing databases. For a given vapor composition and pressure combination, the temperature and liquid composition were obtained by iterative calculations of equations (1) and (2). Because the system has two degrees of freedom, the dew point can be easily inferred at a given vapor composition and pressure.

Performance test method of the dew point measuring device 100 according to a preferred embodiment of the present invention is first mounted on the sensor tube 30, the crystal oscillator sensor 32 is installed in the T tube 20 'which is a chamber to be preheated to a predetermined temperature Soaked in the first thermostat (70). The coolant is supplied to the cavity 34 of the sensor module 30 at a flow rate of 25 mL / min at the same temperature as the temperature in the T pipe 20 ', and 5 mL of acetone-methanol mixed liquid while the discharge valve 26 is opened. The sample was injected through the socket 22 'which is the inlet. At this time, a suction pump (not shown) was connected to the fitting 24 'to discharge the air contained in the T pipe 20'. Then another 5 mL of liquid sample was injected and the discharge valve 26 was closed. And the pressure in T pipe 20 'was adjusted by opening and closing the discharge valve 26. As shown in FIG.

When the pressure in the T pipe 20 'of the dew point measuring device 100 is set by this process, the crystal oscillator sensor is lowered by lowering the temperature of the cooling water supplied to the cavity 34 of the sensor module 30 constantly. (32) The condensation of the gas generated on the surface was measured. After the dew point measurement, the temperature of the cooling water was raised to return to the initial temperature. In the next experiment, the temperature in the T pipe 20 'was increased to increase the pressure in the T pipe 20'. The next experiment was carried out by the same method as described above, and the performance experiment for the dew point measurement of the organic vapor mixture of the present invention was carried out at three different pressures of the same sample vapor by the above method. The temperature of the T tube 20 'and the cooling water, the pressure of the T tube 20', and the response frequency of the crystal oscillator sensor 32 were stored in the computer 62 and used for analysis after the experiment was completed. In order to know the composition, a small amount of sample vapor was taken through the inlet 22, the socket 22 ', and gas chromatography was used to obtain the composition of these sample vapors.

The dew point measuring method and apparatus of the present organic vapor mixture uses a crystal oscillator sensor 32, so that when the condensation of steam on the surface of the crystal oscillator sensor 32 occurs, the response frequency decreases, and the crystal oscillator at that moment The temperature of the sensor 32 becomes the dew point of the organic vapor mixture. In addition, since the frequency change of the crystal oscillator sensor 32 is very sensitive, steam condensation is measured from the onset of condensation without changing the vapor composition. Otherwise, compositional changes due to large amounts of steam condensation will lead to inaccurate measurements.

FIG. 5 is a graph showing changes in pressure and response frequency of the sensor module with respect to temperature changes of the sensor module and the cooling medium in the first experiment using the dew point measuring apparatus of the organic vapor mixture of FIG. 4, and FIG. A graph showing the determination of dew point at the initial stage of the response frequency drop of the sensor module in the first experiment using the dew point measuring device of the vapor mixture, and FIG. 7 is a second experiment using the dew point measuring device of the organic vapor mixture of FIG. Is a graph showing the change of the pressure and response frequency of the sensor module with respect to the temperature change of the sensor module and the cooling medium, Figure 8 is a second experiment using the dew point measuring device of Figure 4 at the initial stage of the response frequency drop of the sensor module This graph shows the determination of the dew point.

The change in the response frequency of the crystal oscillator sensor 32, the temperature of the sample and the coolant, and the pressure in the chamber {T tube 20 '} according to the first experiment according to the measuring method as described above are shown in FIG. The upper left is the change in response frequency of the crystal oscillator sensor 32, the upper right is the temperature change of the sample, the lower left is the temperature change of the coolant (the coolant circulated and supplied to the cavity 34 of the sensor module 30), and the lower right is The change in pressure in the chamber is shown. As shown in the graph of FIG. 5, the response frequency of the crystal oscillator sensor 32 decreases, as opposed to the temperature of the sample being kept constant as the temperature of the cooling water decreases. This indicates that the sample vapor condenses to the surface of the crystal oscillator sensor 32. Since the rise of the coolant temperature causes evaporation of the condensate, the response frequency of the crystal oscillator sensor 32 returns to the initial state.

At this time, the performance test of the dew point measuring device was performed three times at different pressures in the chamber by the same method. Two asymptotic methods in the early stages of condensation are shown in FIG. 6 to determine more accurate dew points. The two asymptotes represent changes in response frequency before and after condensation, respectively, and the intersection of these asymptotes is the instant of condensation of the steam, the temperature of which is the dew point of the sample vapor. Graph of three response frequency changes in FIG. 6 The dew point obtained by the above method is shown in Table 1 below.

In addition, the results of the second performance experiment by the above method are shown in Figs. The dew point was also obtained by the same method as the first experiment, and the results are also shown in Table 1.

The UNIQUAC equation was used for the prediction of the dew point for comparison with the results of the performance experiments and the dew point predicted from the gas-liquid equilibrium relationship. Since the dew point measuring device of the present invention has two degrees of freedom, the dew point calculation is easily calculated with a given vapor composition and pressure. Prediction of the dew point in the performance experiments is also shown in Table 1.

TABLE 1

Comparison of dew point measured with dew point measuring device and dew point predicted by UNIQUAC equation

Pressure [kPa] Measured value [℃] Estimated value [℃] Mole fraction of acetone First experiment 111.3 61.2 62.8 0.267 121.6 64.4 65.1 0.267 130.9 65.6 67.1 0.267 Second experiment 119.6 65.9 65.9 0.187 127.8 67.7 68.4 0.187 140.7 70.2 71.1 0.187

Referring to [Table 1] above, the maximum error between the dew point obtained by the dew point measuring device of the present invention and the dew point predicted by the UNIQUAC equation is about 1.6 ° C., but the organic vapor mixture using the faucet vibrator sensor 32 of the present invention. It can be seen that the performance of the dew point point measuring apparatus of. It can also be seen that dew point determination of the composition of organic vapors is possible in one laboratory operation at many different pressures. This also indicates that the measurement of the gas-liquid equilibrium enables the use of a liquid sample in the chamber of the dew point measuring device of the present invention.

Therefore, in measuring the dew point of the organic vapor mixture of the present invention in the measurement of gas-liquid equilibrium data, the dew point of the organic vapor mixture can be measured in-line by using a crystal oscillator sensor. It can be seen that can be used sufficiently.

As described above, the dew point measuring method and apparatus of the organic vapor mixture according to a preferred embodiment of the present invention has been shown in accordance with the above description and drawings, but this is only an example and is not limited to the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made therein.

According to the dew point measuring method and apparatus of the organic vapor mixture according to the present invention, it is possible to simply and easily configure the apparatus using a crystal oscillator sensor in measuring the dew point which is one of the gas-liquid equilibrium data. In particular, the dew point measuring method and apparatus of the organic vapor mixture according to the present invention applies a specific response frequency change when the condensation of gas occurs on the surface of the crystal oscillator sensor even if the response frequency change has a slight fluctuation. This is possible. In addition, the dew point measuring method and apparatus of the organic vapor mixture according to the present invention can be easily applied to the manufacturing site because it can build an in-line system.

Claims (6)

In the dew point measuring method of the organic vapor mixture, Allowing the organic vapor mixture to contact one side of the crystal oscillator sensor and allowing the cooling medium to contact the other side; Dew point measurement method of the organic vapor mixture, characterized in that for measuring the temperature of the organic vapor mixture at the time when the condensation of gas occurs on the surface of the crystal oscillator sensor. The method of claim 1, The time point at which the condensation of gas occurs on the surface of the crystal oscillator sensor is measured by measuring the change in the response frequency output from the crystal oscillator sensor. The method according to claim 1 or 2, Contacting the organic vapor mixture on one side of the crystal oscillator sensor and contacting the cooling medium on the other side of the crystal oscillator sensor allows the sensor module on which the crystal oscillator sensor is installed to be maintained at a constant temperature through the first thermostat, and then the second Dew point measurement method of an organic vapor mixture, characterized in that the circulation is controlled by controlling the temperature of the cooling medium through a thermostat. In the dew point measuring device of the organic vapor mixture, A chamber in which the introduced organic vapor mixture is accommodated, and an inlet for introducing the organic vapor mixture from the outside and an outlet for discharging the organic vapor mixture to the outside; One side of the crystal oscillator sensor is installed on one side of the chamber in communication with the chamber to be in contact with the organic vapor mixture contained in the chamber, to accommodate the cooling medium so that the cooling medium is in contact with the other side of the crystal oscillator sensor A sensor module having a cavity formed therein; A resonance circuit connected to the crystal oscillator sensor outside of the chamber; And a measuring device connected to the resonant circuit to measure a response frequency from the crystal vibrator sensor and connected to the chamber to measure pressure and temperature in the chamber. The method of claim 4, wherein The chamber and the sensor module are installed in a first thermostat for temperature control, and the cooling medium accommodated in the cavity is circulated by controlling the temperature in a second thermostat installed outside the first thermostat. Dew point measuring device of the mixture. The method of claim 5, wherein The measuring device is coupled to the chamber to measure a pressure in the chamber; A first thermometer coupled to the chamber for measuring a temperature in the chamber; A second thermometer for measuring the temperature in the first thermostat for controlling the temperature of the chamber; A third thermometer for measuring the temperature of the cooling medium supplied into the cavity; And a computer that is connected to the resonant circuit, the pressure gauge, and the first to third thermometers, and receives and processes data of digitally inputted values, the supersaturation degree of the mother liquor.

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