Device for measuring carbon tetrachloride adsorption rate of activated carbon

Abstract

The utility model relates to the technical field of experimental devices for measuring the adsorption rate of activated carbon, in particular to a device for measuring the adsorption rate of activated carbon to carbon tetrachloride. Comprising an ice-water bath device, a constant-temperature water bath device, and a gas supply device, a drying tower, a sulfuric acid drying bottle, a buffer bottle, a carbon tetrachloride steam generator, a flow meter, an adsorption determination tube and a PID gas detector which are sequentially connected, the carbon tetrachloride steam generator is located in the ice-water bath device, and the adsorption determination tube is located in the constant-temperature water bath device; and the gas supply device is a high-pressure nitrogen cylinder. The utility model provides a device which is more accurate, is simpler and more convenient to operate and can be used for measuring the carbon tetrachloride adsorption rate of newly produced or used activated carbon with different characters (powder, particles and blocks).

Description

Technical Field

[0001] The utility model relates to the technical field of experimental devices for measuring the adsorption rate of activated carbon, and particularly relates to a device for measuring the adsorption rate of activated carbon to carbon tetrachloride. Background Technique

[0002] In activated carbon, carbon tetrachloride represents the adsorption performance of activated carbon to gas, which is mainly used in the coal and coal products industries and wood-based activated carbon for the adsorption (removal) of toxic and harmful substances (especially VOCs). In order to know the carbon tetrachloride adsorption rate in activated carbon, people need to use corresponding devices for measuring the carbon tetrachloride adsorption rate of activated carbon.

[0003] Currently, the methods for measuring the adsorption capacity of activated carbon are: the iodine adsorption value, methylene blue decolorizing power, and caramel decolorizing power of activated carbon for liquid-phase adsorption performance. Through the relationship between the iodine adsorption value, methylene blue decolorizing power, and caramel decolorizing power of activated carbon and the pore structure of activated carbon, the adsorption capacity of activated carbon for these three substances is obtained.

[0004] Carbon tetrachloride is an organic compound, which is in a liquid state, has certain toxicity and is volatile. In activated carbon, carbon tetrachloride represents the adsorption performance of activated carbon to gas. The higher the adsorption rate of carbon tetrachloride, the better the adsorption effect of the activated carbon. Currently, relevant research shows that the CTC value is more suitable than the iodine adsorption value, methylene blue decolorizing power, and caramel decolorizing power as a characteristic index for characterizing the adsorption performance of activated carbon, and the CTC value can be used to refer to the VOCs adsorption performance of different porous adsorption materials, more accurately representing the adsorption capacity of activated carbon for volatile organic compounds.

[0005] As an efficient adsorption material, activated carbon is widely used in the purification of toxic and harmful gases (especially VOCs). Traditional national standard detection methods are often time-consuming and cumbersome, and cannot meet the needs of real-time monitoring. Content of the Utility Model

[0006] In order to solve the above problems, the utility model provides a device for measuring the carbon tetrachloride adsorption rate of activated carbon with different properties (powder, granule, block) in new production or use, which is more accurate and easier to operate.

[0007] The technical solution adopted by the utility model is to provide a device for measuring the carbon tetrachloride adsorption rate of activated carbon, including an ice-water bath device, a constant-temperature water bath device, and a gas supply device, a drying tower, a sulfuric acid drying bottle, a buffer bottle, a carbon tetrachloride vapor generator, a flow meter, an adsorption measurement tube, and a PID gas detector connected in sequence. The carbon tetrachloride vapor generator is located in the ice-water bath device, the adsorption measurement tube is located in the constant-temperature water bath device, and the gas supply device is a high-pressure nitrogen cylinder.

[0008] The ice-water bath device includes a water bath tank body with an open upper end, a partition plate arranged in the water bath tank body, a lapping boss arranged on the inner wall of the water bath tank body, and an orifice plate arranged in the water bath tank body. The lapping bosses are symmetrically arranged and are respectively located on the opposite inner walls of the water bath tank body. The orifice plate is lapped on the lapping bosses, and the lower end of the partition plate abuts against the upper end of the orifice plate.

[0009] There are two said partition plates.

[0010] On the opposite inner walls of the water bath tank body, multiple groups of sliding guide columns are symmetrically arranged. The sliding guide columns are vertically arranged, and the number of each group of sliding guide columns is two. The two ends of the partition plate are respectively inserted between the sliding guide columns.

[0011] The cross section of the sliding guide column is semi-circular.

[0012] It further includes an overflow tank body arranged on one side of the water bath tank body. An overflow hole for connection is arranged between the overflow tank body and the water bath tank body.

[0013] The beneficial effects of the present utility model are as follows: The pressurizable carrier gas cylinder filled with high-purity nitrogen is used for gas supply, which will not be affected by external conditions such as sun exposure and will not affect the adsorption measurement. Moreover, the pressure is controlled by a valve to control the nitrogen gas flow rate, which is convenient to operate and can significantly improve the detection efficiency and detection accuracy; the activated carbon in the adsorption measurement tube in the adsorption measurement unit can have various forms (powder, granule, block). With quality control as the guarantee, continuous and constant-speed continuous ventilation is carried out, making the application range of the device wider; a PID gas detector is provided in the detection unit, which can quickly detect the time when the activated carbon to be measured in the adsorption measurement tube is adsorbed and saturated through the real-time change of the VOCs concentration, improving the accuracy and efficiency of detection; the structure of this device is simple, the cost is low, the operation is convenient, and the adsorption force of the activated carbon can be measured quickly. Description of the Drawings

[0014] Figure 1 is the structural schematic diagram of the present utility model;

[0015] Figure 2 is the side view sectional structural schematic diagram of the ice-water bath device of the present utility model;

[0016] Figure 3 is the top view sectional structural schematic diagram of the ice-water bath device of the present utility model.

[0017] In the drawings, 1. Ice-water bath device, 2. Constant temperature water bath device, 3. Gas supply device, 4. Drying tower, 5. Sulfuric acid drying bottle, 6. Buffer bottle, 7. Carbon tetrachloride vapor generator, 8. Flowmeter, 9. Adsorption measurement tube, 10. PID gas detector, 11. Water bath tank body, 12. Partition plate, 13. Lapping boss, 14. Orifice plate, 15. Sliding guide column, 16. Overflow tank body, 17. Overflow hole. DETAILED DESCRIPTION

[0018] like Figures 1-3 As shown, the utility model provides a device for measuring the adsorption rate of activated carbon to carbon tetrachloride, comprising an ice water bath device 1, a constant temperature water bath device 2, and a gas supply device 3, a drying tower 4, a sulfuric acid drying bottle 5, a buffer bottle 6, a carbon tetrachloride vapor generator 7, a flow meter 8, an adsorption measuring tube 9 and a PID gas detector 10 connected in sequence, wherein the carbon tetrachloride vapor generator 7 is located in the ice water bath device 1, the adsorption measuring tube 9 is located in the constant temperature water bath device 2, and the gas supply device 3 is a high-pressure nitrogen bottle.

[0019] High-purity nitrogen gas enters the drying tower 4 and the sulfuric acid drying bottle 5 in sequence from the high-pressure nitrogen bottle of the gas supply device 3, and is dried by the drying tower 4 and the sulfuric acid drying bottle 5. After being dried, the nitrogen gas enters the buffer bottle 6 for buffering. The purpose of buffering is to avoid uneven gas flow rate entering the carbon tetrachloride vapor generator 7. The high-purity nitrogen gas enters the carbon tetrachloride vapor generator 7 from the buffer bottle 6 to bring out and mix the carbon tetrachloride gas, and enters the adsorption measuring tube 9 through the flow meter 8. The adsorption measuring tube 9 is preset with activated carbon. The mixed gas enters the PID gas detector 10 after passing through the activated carbon.

[0020] The ice water bath device 1 is equipped with a temperature sensor, which can monitor the water bath temperature in real time. The ice water of the ice water bath device 1 can reduce the temperature of the carbon tetrachloride vapor to room temperature, so that the nitrogen can more stably carry out and mix the carbon tetrachloride gas. The flow meter 8 adopts a gas float flow meter with adjustable flow. The flow meter 8 is used to adjust and control the flow according to actual needs, so that the mixed gas can enter the adsorption measuring tube 9 conveniently and accurately. The adsorption measuring tube 9 is placed in the constant temperature water bath device 2. The constant temperature water bath device 2 is equipped with a temperature sensor, which can monitor the water bath temperature at any time to keep the adsorption measurement process constant temperature. The adsorption measuring tube 9 is filled with activated carbon to be tested. The properties of the activated carbon (powder, granules, blocks) are not limited. The adsorption saturation degree of the activated carbon is determined by the mass change of the activated carbon to be tested at the same time and the calculation of the mass fraction of the carbon tetrachloride adsorption rate. The PID gas detector 10 can directly measure the VOCs concentration after the activated carbon adsorption, and can further determine the adsorption rate of carbon tetrachloride on the activated carbon, thereby improving the detection accuracy and efficiency.

[0021] The specific measurement process is as follows: First, weigh a certain mass of the activated carbon to be measured and put it into the adsorption measurement tube 9, then weigh the mass of the adsorption measurement tube 9. Adjust the water bath temperatures of the constant temperature water bath device 2 and the ice water bath device 1. Connect all parts with a closed purification distribution pipe to prevent external pollution. Open the pressure valve of the high-pressure nitrogen cylinder and adjust the flow rate of the flowmeter 8. High-purity nitrogen passes through the drying tower 4, the sulfuric acid drying bottle 5 for drying and the buffer bottle 6 for buffering, and then enters the carbon tetrachloride vapor generator 7 to be mixed with the carbon tetrachloride gas. The carbon tetrachloride vapor is carried out and enters the adsorption measurement tube 9 filled with a certain mass of the activated carbon to be measured. After that, weigh it every 5 minutes and record the weight until the mass remains unchanged (the mass difference before and after is ≤ 0.01 g), that is, until adsorption saturation is reached. Then, the adsorption rate of the activated carbon can be calculated. The PID gas detector 10 can observe the concentration change of VOCs in real time, and record the concentration change of VOCs every 5 s during ventilation. When the VOCs concentration number on the PID gas detector no longer changes (the VOCs concentration difference between the previous and the current time is ≤ 0.1 mg / m 3 ), the activated carbon is saturated with adsorption. Thus, the time when the activated carbon is saturated with adsorption can be known, and the adsorption capacity of the activated carbon can be roughly judged and evaluated according to the length of the adsorption saturation time.

[0022] As Figures 2-3 shown, the ice water bath device includes a water bath tank body 11 with an open upper end, a partition 12 arranged in the water bath tank body 11, a lapping boss 13 arranged on the inner wall of the water bath tank body 11, and an orifice plate 14 arranged in the water bath tank body 11. The lapping bosses 13 are symmetrically arranged and are respectively located on the opposite inner walls of the water bath tank body 11. The orifice plate 14 is lapped on the lapping bosses 13, and the lower end of the partition 12 abuts against the upper end of the orifice plate 14.

[0023] As Figures 2-3 described, there are two partitions 12.

[0024] The water bath tank body 14 is divided into four communicating spaces by two partitions 12 and one orifice plate 14, separating the ice cubes and ice water, so that the ice cubes and the carbon tetrachloride vapor generator 7 are in different spaces, avoiding the obstruction when the carbon tetrachloride vapor generator 7 is put in after the ice cubes are put in. The space between the partitions 12 is used to place the carbon tetrachloride vapor generator 7, and the spaces between the partition 12 and the inner wall of the water bath tank body 11 and between the orifice plate 14 and the bottom of the water bath tank body 14 are used to place ice cubes, making the temperature in the water bath tank body 14 uniform. The orifice plate 14 also plays a supporting role for the partition 12 and the carbon tetrachloride vapor generator 7. This design has a simple structure, low cost, is convenient to use and clean, and has simple operation.

[0025] As Figures 2-3As shown, a plurality of sliding guide columns 15 are symmetrically arranged on the opposite inner walls in the water bath tank body 11. The sliding guide columns 15 are arranged vertically, and the number of each group of sliding guide columns 15 is two. Both ends of the partition plate 12 are respectively inserted between the sliding guide columns 15.

[0026] The partition plate 12 is limited by sliding and inserting into the sliding guide columns 15. According to the actual situation, the number of partition plates 12 used can be selected, and the position of the partition plate 12 in the water bath tank body 11 can be quickly adjusted at any time, and the size of the separated space can be adjusted. It is convenient to use, easy to operate, and has a wide range of applications.

[0027] As Figures 2-3 shown, the cross-section of the sliding guide column 15 is semi-circular.

[0028] The sliding guide column 15 with an arc-shaped convex surface can facilitate the insertion of the partition plate 12 more conveniently, play a guiding role for the partition plate 12, is more convenient to operate, will not produce dead corners, and is convenient for later cleaning.

[0029] As Figures 2-3 shown, it further includes an overflow tank body 16 arranged on one side of the water bath tank body 11, and an overflow hole 17 for communication is arranged between the overflow tank body 16 and the water bath tank body 11.

[0030] The overflowing ice water flows into the overflow tank body 16 through the overflow hole 17, effectively avoiding the outflow of ice water, reducing the accuracy of the amount of ice cubes and water added, and making it simpler to use.

Claims

1. A device for measuring the adsorption rate of activated carbon to carbon tetrachloride, characterized in that: The invention comprises an ice-water bath device (1), a constant-temperature water bath device (2), and a gas supply device (3), a drying tower (4), a sulfuric acid drying bottle (5), a buffer bottle (6), a carbon tetrachloride vapor generator (7), a flow meter (8), an adsorption measuring tube (9) and a PID gas detector (10) which are connected in sequence, wherein the carbon tetrachloride vapor generator (7) is located in the ice-water bath device (1), the adsorption measuring tube (9) is located in the constant-temperature water bath device (2), and the gas supply device (3) is a high-pressure nitrogen bottle; The ice water bath device comprises a water bath body (11) with an opening at the upper end, a partition (12) arranged in the water bath body (11), a lap boss (13) arranged on the inner wall of the water bath body (11), and a perforated plate (14) arranged in the water bath body (11), wherein the lap bosses (13) are symmetrically arranged and respectively located on opposite inner walls of the water bath body (11), the perforated plate (14) is lapped on the lap bosses (13), and the lower end of the partition (12) abuts against the upper end of the perforated plate (14); It also comprises an overflow tank body (16) arranged on one side of the water bath tank body (11), and a communicating overflow hole (17) is arranged between the overflow tank body (16) and the water bath tank body (11).

2. A device for measuring the adsorption rate of activated carbon to carbon tetrachloride according to claim 1, characterized in that: Two partitions (12) are provided.

3. A device for measuring the adsorption rate of activated carbon to carbon tetrachloride according to claim 1, characterized in that: A plurality of groups of sliding guide columns (15) are symmetrically arranged on opposite inner walls of the water bath body (11), the sliding guide columns (15) are arranged vertically, and each group of sliding guide columns (15) has two sliding guide columns. The two ends of the partition (12) are respectively inserted between the sliding guide columns (15).

4. A device for measuring the adsorption rate of activated carbon to carbon tetrachloride according to claim 3, characterized in that: The cross section of the sliding guide column (15) is semicircular.

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