Clamping device for combined Soxhlet extraction of benzene-soluble substances

Abstract

This utility model discloses a clamping device for combined Soxhlet extraction of benzene-soluble substances. The device includes a constant-temperature water bath on a test bench, a receiving bottle placed within the water bath, and a Soxhlet extraction cylinder and a condenser tube sequentially connected to the bottle opening. A column is vertically mounted on the test bench and located on both sides of the water bath. The upper section of the column is threaded, and a positioning nut is screwed into it. A positioning plate has through holes on both sides and a positioning circular hole spaced apart in the middle. The column is fitted into the through holes on both sides of the positioning plate and supported by the positioning nuts. The condenser tube passes through the positioning circular holes. A four-claw bracket is placed in the water bath and supports the receiving bottle. This device overcomes the shortcomings of traditional Soxhlet extraction of benzene-soluble substances, improves operational convenience and efficiency, eliminates safety hazards, and ensures the reliability of extraction data.

Description

Technical Field

[0001] This utility model relates to the field of environmental monitoring technology, and in particular to a clamping device for combined Soxhlet extraction of benzene-soluble substances. Background Technology

[0002] In the determination of benzene-soluble substances in waste gas from stationary pollution sources, the benzene-soluble substances in the filter membrane are extracted using a Soxhlet extractor. The receiving flask is heated by a constant temperature water bath and cooled by cooling water. The organic solvent is refluxed in the extraction tube. The sample is extracted by soaking and extraction multiple times to achieve the purpose of sample extraction.

[0003] Benzene, as an organic solvent, is flammable and volatile at room temperature, and possesses strong carcinogenic and teratogenic properties. Currently, metallurgical enterprises frequently need to measure benzene-soluble substances in waste gas from stationary pollution sources. However, traditional Soxhlet extraction methods for particulate-laden membranes are inconvenient and inefficient. Furthermore, thermal expansion can easily cause the Soxhlet extraction apparatus (including condenser, extraction cylinder, and receiving bottle) to tilt or even tip over, leading to benzene leakage, benzene poisoning, and even posing a significant threat to human life, making it extremely dangerous. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a clamping device for combined Soxhlet extraction of benzene soluble substances. This device overcomes the defects of traditional Soxhlet extraction of benzene soluble substances, improves the convenience and efficiency of operation, eliminates safety hazards, and ensures the reliability of extraction data.

[0005] To solve the above-mentioned technical problems, the present invention provides a clamping device for combined Soxhlet extraction of benzene-soluble substances, comprising a test bench, a constant temperature water bath, a receiving bottle, a Soxhlet extraction cylinder, and a condenser. The constant temperature water bath is located on the test bench, and the receiving bottle is located on the constant temperature water bath. The Soxhlet extraction cylinder and the condenser are sequentially connected above the mouth of the receiving bottle. The device also includes a column, a positioning plate, and a four-jaw bracket. The column is vertically mounted on the test bench and located on both sides of the constant temperature water bath. The upper section of the column is threaded, and a positioning nut is screwed into the upper section of the column. The positioning plate has through holes on both sides and positioning holes spaced apart in the middle. The column is fitted into the through holes on both sides of the positioning plate and supported by the positioning nuts. The condenser passes through the positioning holes. The four-jaw bracket is located on the constant temperature water bath and supports the receiving bottle.

[0006] Furthermore, the thread on the upper section of the column is a fine thread, there are two positioning nuts, and the top surface of the positioning nuts is provided with a flat washer.

[0007] Furthermore, the positioning hole in the middle of the positioning plate has a groove along the radial direction towards one side of the positioning plate.

[0008] Furthermore, a base is provided at the bottom of the column. Because this utility model's clamping device for combined Soxhlet extraction of benzene-soluble substances adopts the above-mentioned technical solution, namely, the constant temperature water bath of this device is set on the test bench, the receiving bottle is set on the constant temperature water bath, and the Soxhlet extraction cylinder and condenser tube are sequentially connected above the bottle mouth of the receiving bottle; the column is vertically set on the test bench and located on both sides of the constant temperature water bath, and the upper section of the column is threaded, with a positioning nut screwed into the upper section of the column; the positioning plate has through holes on both sides and positioning round holes spaced apart in the middle; the through holes on both sides of the positioning plate are fitted into the column and supported by the positioning nuts; the condenser tube passes through the positioning round holes; and the four-claw bracket is set on the constant temperature water bath and supports the receiving bottle. This device overcomes the defects of traditional Soxhlet extraction of benzene-soluble substances, improves the convenience and efficiency of operation, eliminates safety hazards, and ensures the reliability of extraction data. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the clamping device for combined Soxhlet extraction of benzene-soluble substances according to this utility model; Figure 2 This is a schematic diagram of the column structure in this device; Figure 3 This is a schematic diagram of the positioning plate structure in this device; Figure 4 This is a schematic diagram of the four-jaw bracket structure in this device. Detailed Implementation

[0010] Implementation, for example Figures 1 to 4 As shown, the clamping device for combined Soxhlet extraction of benzene-soluble substances of this utility model includes a test bench 1, a constant temperature water bath 2, a receiving bottle 3, a Soxhlet extraction cylinder 4, and a condenser tube 5. The constant temperature water bath 2 is located on the test bench 1, and the receiving bottle 3 is located on the constant temperature water bath 2. The Soxhlet extraction cylinder 4 and the condenser tube 5 are sequentially connected above the mouth of the receiving bottle 3. It also includes a column 6, a positioning plate 7, and a four-jaw bracket 8. The column 6 is vertically arranged on the test bench 1 and located on both sides of the constant temperature water bath 2. The upper section of the column 6 is provided with a thread 61, and a positioning nut 62 is screwed into the upper section of the column 6. The positioning plate 7 is provided with through holes 71 on both sides and positioning round holes 72 spaced apart in the middle. The through holes 71 on both sides of the positioning plate 7 are fitted into the column 6 and supported by the positioning nuts 62. The condenser tube 5 passes through the positioning round holes 72. The four-jaw bracket 8 is located on the constant temperature water bath 2 and supports the receiving bottle 3.

[0011] Preferably, the thread 61 on the upper section of the column 6 is a fine thread, there are two positioning nuts 62, and the top surface of the positioning nut 62 is provided with a flat washer 64.

[0012] Preferably, the positioning hole 72 in the middle of the positioning plate 7 has a groove 73 extending radially toward one side of the positioning plate 7.

[0013] Preferably, the bottom end of the column 6 is provided with a base 63.

[0014] In this device, the test bench, constant temperature water bath, receiving bottle, Soxhlet extraction tube and condenser constitute a combined Soxhlet extraction mechanism for benzene-soluble substances.

[0015] Positioning holes are drilled at intervals in the positioning plate. The condenser tube passes through these holes for fixation. The diameter D1 of the positioning holes is slightly larger than the diameter d1 of the condenser tube (D1-d1=1~2mm) to prevent the condenser tube from wobbling back and forth or left and right in the positioning holes, while ensuring that the condenser tube can move freely up and down in the positioning holes. When the two positioning holes are slotted on one side of the positioning plate, the slot width B1 is slightly larger than the diameter d2 of the condenser tube's inlet and outlet water pipe interfaces. This ensures that when the inlet and outlet water pipe interfaces of the condenser tube are aligned with the slot opening, the condenser tube can be smoothly installed into the positioning hole from top to bottom. After rotating the inlet and outlet water pipe interfaces of the condenser tube and offsetting them from the slot opening by a certain angle, the condenser tube can be more securely fixed in the positioning hole. The center distance L2 between the positioning holes is consistent with the center distance of the receiving bottle in the constant temperature water bath to prevent the "condenser tube + Soxhlet extractor + receiving bottle" from becoming misaligned after installation and connection.

[0016] The diameter D2 of the through holes on both sides of the positioning plate is slightly larger than the diameter d3 of the thread in the column (D2-d3=1~2mm) to ensure that the positioning plate can be easily and conveniently placed on the column during installation and vertical adjustment. At the same time, it prevents the positioning plate from wobbling in the front-back and left-right directions of the column and ensures that the positioning plate can move freely in the vertical direction in the through hole. The center distance L3 is appropriately larger than the length of the constant temperature water bath to ensure that there is enough space for the installation of the column and its base.

[0017] The column is made of round steel, and its total length is greater than the total height of the "condenser tube + Soxhlet extractor + receiving bottle" after connection. The upper section of the column is machined with fine thread, and the length of the fine thread is approximately equal to the length of the condenser tube, so as to ensure that the positioning plate is always positioned between the inlet and outlet water pipe interfaces of the condenser tube after assembly.

[0018] The base is made of steel plate with a thickness of 10mm; the base and the column are connected by threads.

[0019] After the columns, bases, and positioning plates are manufactured, they are assembled into a complete set. The number of sets matches the number of rows before and after the bottle receiving station in the constant temperature water bath. For example, if there is one row before and after the bottle receiving station in the constant temperature water bath, one set of columns (with bases) and positioning plates is manufactured and assembled; if there are two rows before and after the bottle receiving station in the constant temperature water bath, two sets of columns (with bases) and positioning plates are manufactured and assembled.

[0020] The four-claw bracket is made of 1mm thick stainless steel plate, cut into steel strips approximately 15mm wide. The base ring of the bracket is made of steel strips of appropriate length according to the dimensions of the receiving bottle, spliced ​​end to end into a ring, and welded to form the bracket base ring. The diameter of the bracket base ring is required to be slightly larger than the diameter of the bottom of the receiving bottle to ensure line contact between the receiving bottle and the bracket base ring, thus ensuring uniform heating of the receiving bottle in the constant temperature water bath. The four "claws" of the bracket are made of steel strips of appropriate length according to the dimensions of the receiving bottle, bent into "S" shapes, and evenly distributed around the base ring, with four "claws" welded on. Utilizing the "S" shape of the steel strips and their hardness and elasticity, the bracket ensures that the receiving bottle can be easily inserted into and removed from the four-claw bracket.

[0021] The actual operation is as follows: Place the constant temperature water bath on the test bench; place the columns (with bases) on both sides of the constant temperature water bath; screw two fine-thread nuts and insert flat washers into the upper section of the columns to increase the contact area between the fine-thread nuts and the positioning plate, thereby increasing the stability of the positioning plate; place the receiving bottles in the four-claw brackets and place them in their respective positions in the constant temperature water bath; insert the condenser tubes from top to bottom into the positioning holes of the positioning plate and rotate the condenser tubes so that the inlet and outlet water pipe interfaces of the condenser tubes are staggered; place the positioning plate with the condenser tubes on the flat washers of the paired columns (with bases); connect the Soxhlet extraction tubes between the condenser tubes and the receiving bottles; connect all the condenser tubes end to end with flexible tubing in the order of "inlet-outlet-inlet-outlet..." to form a closed loop, thus forming a combined Soxhlet extraction system for benzene-soluble substances.

[0022] The clamping device needs to be adjusted after installation: To adjust the height of the positioning plate, rotate the uppermost fine-threaded nut on the column to adjust the height of the positioning plate so that it is centered in the vertical direction of the condenser tube.

[0023] To level the positioning plate, use a steel ruler or steel tape measure to measure the height of both sides of the positioning plate. If they are inconsistent, gently rotate the uppermost fine-threaded nut on the column until the heights on both sides are the same. At the same time, fix the uppermost fine-threaded nut on each column in place, rotate the fine-threaded nut below it to bring the two nuts together and tighten them.

[0024] Adjust the verticality of the "condenser tube + Soxhlet extraction cylinder + receiving bottle". Move the base at the bottom of the column back and forth and left and right to align the positioning hole of the positioning plate with the center of the receiving bottle position of the constant temperature water bath, thereby ensuring that the "condenser tube + Soxhlet extraction cylinder + receiving bottle" is vertical and not tilted.

[0025] The Soxhlet extraction process for benzene-soluble substances involves first adding an appropriate amount of purified water to a constant temperature water bath, placing a filter membrane containing particulate matter into the Soxhlet extraction tube, and adding benzene into the receiving flask. Then, connect the top and bottom of the Soxhlet extraction tube to the condenser and the receiving flask respectively, heat to reflux, maintain a constant temperature, and follow the operating procedures to perform Soxhlet extraction of benzene-soluble substances.

[0026] This device consists of a column with fine threads, a positioning plate with grooves and positioning holes, and a four-jaw bracket. The fine threads on the column allow for quick and precise installation and adjustment of the positioning plate. Meanwhile, each column is equipped with double nuts, which maintain the constant vertical position of the positioning plate by utilizing the anti-loosening principle of double nuts; the "four-claw" positioning of the four-claw bracket ensures that the receiving bottle neither contacts the bottom of the constant temperature water bath nor floats on the water surface, guaranteeing that the receiving bottle is heated evenly in the water bath, and the integrated "condenser tube + Soxhlet extraction cylinder + receiving bottle" has a fixed support point in the vertical direction; the ingenious design of the slot in the positioning plate facilitates the smooth insertion of the condenser tube into the positioning hole of the positioning plate from top to bottom, and after rotating and offsetting the inlet and outlet water pipe interfaces of the condenser tube, the condenser tube can still be firmly fixed in the positioning hole; the difference in diameter between the positioning hole in the positioning plate and the condenser tube, as well as the difference in diameter between the through holes on both sides of the positioning plate and the threads in the column, not only restricts the two degrees of freedom in the front-back and left-right directions of the integrated "condenser tube + Soxhlet extraction cylinder + receiving bottle", but also ensures its degree of freedom in the vertical direction, allowing it to freely extend and retract in the vertical direction.

[0027] This device can quickly and accurately adjust the height and horizontal position of the positioning plate, ensuring the receiving bottle remains evenly heated in the water bath. Furthermore, the condenser tube can be adjusted arbitrarily within a certain range in the vertical direction to meet the requirements of various working conditions. This ensures that the integrated "condenser tube + Soxhlet extraction cylinder + receiving bottle" will not tilt or tip over due to thermal expansion during the extraction of benzene-soluble substances. It is also simple to install and operate, easy to adjust, reliable in performance, and safe and stable.

Claims

1. A clamping device for combined Soxhlet extraction of benzene-soluble substances, comprising a test bench, a constant temperature water bath, a receiving bottle, a Soxhlet extraction cylinder, and a condenser, wherein the constant temperature water bath is disposed on the test bench, the receiving bottle is disposed on the constant temperature water bath, and the Soxhlet extraction cylinder and the condenser are sequentially connected above the mouth of the receiving bottle, characterized in that: It also includes a column, a positioning plate, and a four-claw bracket. The column is vertically mounted on the test bench and located on both sides of the constant temperature water bath. The upper part of the column is threaded and a positioning nut is screwed into the upper part of the column. The positioning plate has through holes on both sides and positioning round holes spaced apart in the middle. The column is fitted into the through holes on both sides of the positioning plate and supported by the positioning nuts. The condenser tube passes through the positioning round holes. The four-claw bracket is mounted on the constant temperature water bath and supports the receiving bottle.

2. The clamping device for combined Soxhlet-extracted benzene solubles of claim 1, wherein: The upper section of the column has a fine thread, and there are two positioning nuts, with a flat washer on the top surface of the positioning nut.

3. A clamping device for combined Soxhlet-extracted benzene solubles according to claim 1 or 2, characterised in that: The positioning hole in the middle of the positioning plate has a groove along the radial direction to one side of the positioning plate.

4. The clamping device for combined Soxhlet-extracted benzene solubles of claim 3, wherein: The bottom of the column is provided with a base.

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