KR950011542B1 - Adborption ability measuring system - Google Patents

Abstract

The device exactly measures an absorption performance in a constant solution evaporative density, and improves an absorption performance study for absorbent. The device includes an absorption performance measurement device(100), a buffer tank(110) which is connected to a gas supplier and gas supplying device, an evaporation generative device(120), a sample measurement unit(130), a circulation pump(114b), a gas insertion line(114), an evaporation circulating line(115), a circulating pump(116b), an evaporation inserting gas supplying line(116), an evaporation inserting gas circulating line(117), and a weighing machine(133). A buffer tank(110) has a vaccum pump(113b) and a vaccum line(113).

Description

Adsorption performance measuring device of adsorbent

1 is a schematic diagram of a conventional adsorption capacity measuring apparatus.

2 is a schematic diagram of an apparatus for measuring adsorption capacity according to the present invention.

3 is a graph showing the results of measuring the change in benzene adsorption capacity of domestic activated carbon according to adsorption time using the adsorption capacity measuring apparatus of the present invention.

4 is a graph showing the results of measuring changes in benzene adsorption capacity of domestic activated carbon according to adsorption time using a conventional adsorption capacity measuring apparatus.

5 is a graph showing the results of measuring the change in the benzene adsorption capacity of activated carbon in accordance with the adsorption time using the adsorption capacity measuring apparatus of the present invention.

6 is a graph showing the results of measuring changes in benzene adsorption capacity of activated carbon in foreign acids according to adsorption time using a conventional adsorption capacity measuring apparatus.

* Explanation of symbols for main parts of the drawings

110: buffer tank 111: gas supply line

111b: pressure and flow rate control device 112: gas discharge line

112b: flow control device 113: vacuum line

113b: vacuum pump 114: gas inlet line

114b: first circulation pump 115: steam circulation line

116: steam-containing gas supply line 116b: second circulation pump

117: steam containing gas circulation line 120: steam generator

130: sample measuring unit 133: scale

134: recorder 111a-117a: automatic valve

The present invention relates to an adsorption performance measuring apparatus for measuring the adsorption performance of the adsorbent on gaseous substances such as solvent vapor such as benzene and gasoline. In recent years, industries using benzene, gasoline, and hexanes as solvents and reactants have increased significantly. In these industries, they are used as adsorbents such as activated carbon to prevent pollution and solvent vapor recovery from solvent vapors generated during the process. Solvent vapor is adsorbed.

Therefore, the adsorption performance measurement of the adsorbent is essential for the management of the adsorption treatment process of the solvent vapor, the need for the development of an accurate measuring device is increasing.

As a method for measuring the adsorption performance of the adsorbent, a method using a solvent vapor measuring apparatus (JISK1474 and KS M1802) of granular activated carbon shown in FIG. 1 is known.

As shown in FIG. 1, the dry air introduced through the dry air inlet pipe 10 is respectively opened by the first branch pipe 11 and the second branch pipe by opening the first valve 11a and the second valve 12a. The dry air used through (12) and used through the first branch pipe (11) is moved to the first temperature control tube (11C) in the thermostat (20) after the flow rate is measured by the first flow meter (11b). After maintaining at a constant temperature, the solvent vapor is generated by the air introduced into the first and second solvent container generating bottles 11d and 11e, and the generated solvent vapor passes through the empty bottle 11f. Flows into the mixing bottle (13).

On the other hand, the dry air moved through the second branch pipe 12, the flow rate is measured by the second flow meter (12b) and then sequentially passing through a plurality of second temperature control tube (12d) in the thermostat 20, the fixed temperature It is maintained as and then mixed with the solvent vapor-containing dry air introduced into the gas mixture bottle 13 and introduced through the first branch pipe (11).

The solvent vapor-containing dry air mixed in the gas mixing bottle 13 is discharged to the outside of the thermostat 20 through the solvent vapor-containing dry air supply pipe 14, three bangkok 15 and the excess gas discharge pipe 16, In order to measure the adsorption performance of the adsorbent, the sample flows into the U-shaped sample charge tube 18 filled with the sample through the dry air inlet tube 17 containing the solvent vapor for a predetermined time by the operation of the three-bang cock 15. After adsorbing, it is discharged out of the thermostat 20 through the discharge pipe 19. In the case of using the conventional adsorbent adsorption performance measuring apparatus described above, the amount of adsorption is measured by the weight difference after the adsorption of the sample charge tube 18 before the solvent vapor is adsorbed. However, in the case of measuring by using the above-mentioned conventional adsorption performance measuring device of the adsorbent has the following problems.

First, it is not possible to produce a constant concentration of solvent vapor. That is, dry air of constant humidity, which is a carrier gas, is difficult to control the same humidity every experiment, and the amount of steam generated is not constant according to the amount of dry air, so that it is impossible to generate solvent vapor of a constant concentration.

Second, since the inlet and the discharge pipe (19) for introducing the dry air is open to the atmosphere, if the atmospheric pressure fluctuates according to the season and climate, the adsorption pressure cannot be kept constant.

Third, since the adsorbents have different adsorption characteristics depending on the type and adsorbent, the U-shaped sample filling tube 18 makes it difficult to evaluate the adsorption performance of the adsorbent.

Fourth, to be produced through complex glasswork, there is a slight difference depending on the manufacturer, in which case it is difficult to standardize the adsorption device. The present invention has been proposed in order to improve the problems of the conventional apparatus, it is possible to make a vapor of the equilibrium concentration at a constant pressure, to prevent the inflow of moisture and other impurities, to obtain a constant adsorption force, corrosion resistance It is to provide an apparatus for measuring the adsorption performance of the adsorbent that can be manufactured as well as standardized and has a standard, and its purpose is to.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated. Adsorption performance measuring apparatus 100 of the adsorbent of the present invention comprises a buffer tank 110, a steam generator 120, and a sample measuring unit 130.

The buffer tank 110 is connected to the gas cylinder 140 as a gas supply source by the gas supply line 111, the first gas supply line 111 in the first automatic valve (111a) and the gas cylinder 140 A pressure and flow rate control device 111b for adjusting the pressure and flow rate of the gas to be supplied is provided.

In addition, the buffer tank 110 is connected to the gas discharge line 112 for adjusting the gas pressure in the buffer tank 110, the gas discharge line 112, the second automatic valve 112a and the flow rate control Device 112b is provided.

In addition, a vacuum line 113 is connected to the buffer tank 110, and the vacuum line 113 is provided with a third automatic valve 113a and a vacuum pump 113b, so that the buffer tank 110 and the sample are provided. The inside of the measuring unit 130 is kept in a vacuum state.

The buffer tank 110 and the steam generator 120 is configured such that the gas is circulated by the gas inlet line 114 and the steam circulation line 115, one end of the gas inlet line 114 is the buffer tank And the other end thereof is located in the solvent 121 in the steam generator 120. One end of the steam circulation line 115 is connected to the buffer tank 110, but the other end circulates the solvent vapor generated by the gas introduced through the gas inflow line 114 to the buffer tank 110. It is located in the solvent generating device 120 in a state in which it is not in direct contact with the solvent so that it can be made.

The gas inlet line 114 is provided with a fourth automatic valve 114a and a first circulation pump 114b, and the vapor circulation line 115 is provided with a fifth automatic valve 115a.

In addition, the buffer tank 110 is configured to have a gas circulation relationship with the sample measuring unit 130 by the vapor-containing gas supply line 116 and the vapor-containing gas circulation line 117.

The sixth automatic valve 116a and the second circulation pump 116b are provided in the steam-containing gas supply line 116, and the seventh automatic valve 117a is provided in the steam-containing gas circulation line 117. .

The sample measuring unit 130 is preferably equipped with a pressure gauge 131 and a thermometer 132 capable of measuring the adsorption temperature and pressure, respectively, and on the inner side a scale 133 on which the sample 150 to be measured is placed. The scale 133 is connected to a recorder 134 which is configured to receive and record an electrical signal from the scale 133.

Hereinafter, the method of measuring the adsorption performance of an adsorbent using the adsorption performance measuring apparatus 100 of this invention comprised as mentioned above is demonstrated.

First, after placing the sample 150 to be measured on the scale 133 located in the sample measuring unit 130, the third automatic valve 113a provided in the vacuum line 113 is opened, and the vacuum pump ( 113b) is operated to exhaust the buffer tank 110 and the sample measuring unit 130 to preferably 10 ⁻³ atm or less.

Next, after opening the first automatic valve 111a provided in the gas supply line 111, the pressure and flow rate of the carrier gas in the gas cylinder 140 are measured by the pressure and flow rate adjusting device 111b. It is supplied into the buffer tank (110).

When the carrier gas is filled in the buffer tank 110 as described above, the fourth automatic valve 114a and the fifth automatic valve 115a provided in the gas hydraulic line 114 and the steam circulation line 115 are opened. In addition, by operating the first circulation pump (114b) provided in the gas inlet line 114 flows the carrier gas in the buffer tank 110 into the solvent 121 in the steam generator 120, at this time, the supplied carrier Solvent vapor generated by the gas is supplied to obtain a constant concentration into the buffer tank 110 through the steam circulation line (115).

The solvent vapor partial pressure in the buffer tank 110 is varied by the pressure and flow rate control device 111b provided in the gas supply line 111 and the flow rate control device 112b provided in the gas discharge line 112. Can be adjusted.

When the concentration of the solvent vapor in the buffer tank 110 reaches the equilibrium concentration, the sixth automatic valve 116a provided in the vapor-containing gas supply line 116 is opened to operate the second circulation pump 116b to operate the buffer tank ( The solvent vapor-containing gas in 110 is supplied into the sample measuring unit 130, and at this time, the seventh automatic valve 117a provided in the steam-containing circulation line 117 is opened to allow the solvent vapor-containing gas to flow into the buffer tank 110. ) And the sample measuring unit 130 to circulate.

As described above, the solvent vapor in the vapor-containing gas circulating between the buffer tank 110 and the sample measuring unit 130 is adsorbed to the sample (adsorbent) 150 placed on the scale 133, and the adsorbed amount is adsorbed on the scale. Since the electronic signal is transmitted from the recorder 134 to the recorder 134, the adsorption performance of the sample (adsorbent) 150 can be measured.

As described above, in the case of measuring the adsorption performance using the adsorption performance measuring apparatus 100 of the present invention, the conventional apparatus cannot be performed by gas circulation between the buffer tank 110 and the steam generator 120. However, it is possible to produce equilibrium vapors at constant pressure.

In addition, the present invention is blocked from the atmosphere, since the gas supplied is a pure gas, it is possible to prevent the inflow of moisture and other impurities, and the pressure can be adjusted to a gas supply source [gas cylinder 140] with sufficient pressure, Constant adsorption force can be obtained.

In addition, the present invention, the buffer tank 110 and the steam generator 120 can be made of corrosion-resistant steel, such as stainless steel, it is possible to measure the amount of adsorption by an electrical method, it is possible to standardize the adsorption device.

Hereinafter, the present invention will be described in detail through examples.

Example 1

The adsorption characteristics of the sample (adsorbent) were measured using the present invention and the conventional adsorption performance measuring apparatus, and the measurement results are shown in FIG. 3 for the present invention and FIG. 4 for the conventional method, respectively. At this time, the test temperature was 25 ℃, the pressure was 745 mmHg, using benzene as the solvent, activated carbon without steam treatment and activated carbon steamed at 950 ℃ for 30 minutes, respectively, steam treatment for each method The test was carried out twice for the activated carbon samples before and after. As shown in FIG. 3 and FIG. 4, the amount of benzene adsorption of activated carbon measured by adsorption performance using a conventional adsorption performance measurement device is much larger than that measured by the device of the present invention. It turns out that it shows less also in the adsorption amount than what was measured by the invention apparatus.

Example 2

The adsorption characteristics of the adsorbent (sample) were measured in the same manner as in Example 1 using the present invention and the conventional adsorption performance measuring apparatus, and the measurement results are shown in FIG. 5 for the present invention and FIG. 6 for the conventional method. Each is shown in the figure. However, in the present embodiment, unlike in Example 1, foreign (Japanese) activated carbon was used as a sample. As shown in FIG. 5 and FIG. 6, when the measurement by the conventional method is not only larger in error than the measurement in accordance with the present invention, but also when the amount of adsorption is less effective in improving the adsorption characteristics, the effect is to be understood. It can be seen that it is difficult compared to the invention. According to the results of the above example, it can be seen that when the adsorption performance of the solvent vapor of the adsorbent is measured according to the present invention, the adsorption characteristics of the adsorbent can be more accurately determined than in the conventional method.

That is, since activated carbon reacts with the surface of activated carbon to make various functional groups such as CO and COH, the activated carbon exhibits different adsorptive properties according to the type of activated carbon, steam treatment time, steam treatment temperature, and the like. The precise investigation of the adsorption characteristics of is very important in the industry, many experiments are inevitable for the accurate measurement of the adsorption characteristics of activated carbon in the conventional method, and the adsorption amount tends to be low overall after such experiments. This is because the portion for measuring the adsorption amount of the adsorbent is a U-shaped adsorption tower, which is different from the actual adsorbent reaching equilibrium. That is, the equilibrium of adsorbent and adsorbate in the fixed bed is different from that in the fluidized bed. Adsorption equilibrium measurement in the fixed bed is important because it is possible to compare the adsorbents by accurately understanding the adsorption characteristics of the adsorbents. That is, the conditions of the adsorption tower can be changed in various ways in the field (industrial), so that when measured according to the conventional method, the adsorption characteristics of the adsorbent, breakthrough time, mass transfer zone, It is very difficult to measure the adsorption characteristics of the developed adsorbent due to factors such as the size of charged particles and so on. However, the present invention can accurately measure the adsorption characteristics by measuring the adsorption amount of the fixed adsorbent in the system maintaining a constant solvent vapor concentration, it can be widely used in the study of adsorption characteristics of the adsorbent.

Claims (5)

A buffer tank 110 connected to the gas supply source by the gas supply line 111 in a gas supply relationship; Steam generator 120 for generating a vapor of the solvent; And a sample measuring unit 130 for measuring the adsorption amount of the sample; The buffer tank 110 and the steam generator 120 are connected in a gas circulation relationship by the gas inlet line 114 and the steam circulation line 115 is provided with a circulation pump (114b); The buffer tank 110 and the sample measuring unit 130 are connected in a gas circulation relationship by a steam-containing gas supply line 116 and a steam-containing gas circulation line 117 provided with a circulation pump 116b; A vacuum line (113) having a vacuum pump (113b) is connected to the buffer tank (110); And the sample measuring unit 130, the adsorption performance measuring device of the adsorbent, characterized in that the built-in scale 133 that can measure the sample weight change is built. 2. An apparatus for measuring adsorption performance of an adsorbent according to claim 1, wherein each line (111-117) is provided with an automatic valve. The apparatus of claim 1, wherein the gas supply line (111) is provided with a pressure and flow rate control device (111b). 2. The apparatus of claim 1, wherein the scale (133) is electrically connected to a recorder (134) configured to receive and record the measured amount of adsorption as an electrical signal. According to any one of claims 1 to 4, wherein the buffer tank 110 is provided with an automatic valve 112a and a flow control device (112b) to adjust the solvent vapor partial pressure in the buffer tank (110) Adsorption performance measuring device of the adsorbent, characterized in that the gas discharge line 112 is formed.