Detection device for glycol ether substances in leather and fur

Abstract

The utility model discloses a device for detecting glycol ether substances in leather and fur. The device comprises a determination unit, an extraction unit, a recovery unit and a control system, wherein the extraction unit and the recovery unit are connected with the determination unit through pipelines; the extraction unit comprises a microwave generator, a plurality of microwave cavity bottles arranged in the microwave generator and a refrigerating system; a temperature sensor and a stirring system are arranged in the microwave cavity bottle; the microwave cavity bottle is connected with the measuring unit through an output pipeline; a liquid injection pipe is arranged at the top of the microwave cavity bottle; the measuring unit comprises a chromatographic instrument connected with the output pipeline and a display in data connection with the chromatographic instrument; the recovery unit comprises a magnetic solid-phase extractor and a liquid conveying main pipe connected with the magnetic solid-phase extractor and the liquid injection pipe, and a second control valve is arranged on the liquid conveying main pipe; according to the utility model, the extraction efficiency and the detection accuracy are improved, and the use amount of organic solvent and waste discharge are reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of detecting ethylene glycol ethers, and more particularly to a device for detecting ethylene glycol ethers in leather and fur. Background Technology

[0002] Currently, in the leather and fur industry, the detection of ethylene glycol ethers has always been a crucial step in ensuring product quality and consumer health. Ethylene glycol ethers in leather and fur refer to a class of organic compounds that may remain during the processing of leather and fur, mainly including ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, etc.

[0003] Ethylene glycol ethers, after being metabolized in the body, produce highly toxic alkoxyacetic acids, which are significantly toxic to the blood, nervous, and reproductive systems. Studies have shown that long-term exposure can lead to anemia, sperm abnormalities, abnormal embryonic development, and even induce cancer. Internationally, six ethylene glycol ethers have been listed as restricted substances in leather processing, with strict limits imposed. Therefore, detecting the content of ethylene glycol ethers in leather and fur helps companies control product quality, ensure compliance with relevant domestic and international standards and regulations, and enhance product market competitiveness.

[0004] The existing technology, as described in the standard "Determination of Ethylene Glycol Ether Content in Chemical Testing of Leather and Fur," involves cutting leather or fur samples into small pieces, extracting with methanol using ultrasonic assistance, purifying the extract through membrane filtration or solid-phase extraction, and then determining the content using gas chromatography-mass spectrometry (GC-MS) with external standard method for quantification. However, this existing technology also has drawbacks: 1. The extraction process is relatively cumbersome, requiring the use of large amounts of organic solvents, which not only increases the testing cost but may also cause some environmental pollution; 2. The extraction efficiency and recovery rate need to be improved, especially when processing complex samples, where incomplete extraction of the target substance may occur.

[0005] Therefore, it is necessary to improve an existing device for detecting ethylene glycol ethers in leather and fur to solve the above-mentioned problems. Summary of the Invention

[0006] This invention overcomes the shortcomings of the prior art by providing a device for detecting ethylene glycol ethers in leather and fur, aiming to solve the problems of cumbersome extraction process and low detection efficiency in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a detection device for ethylene glycol ethers in leather and fur, comprising: a measuring unit, an extraction unit and a recovery unit connected to the measuring unit via pipelines, and a control system;

[0008] The extraction unit includes: a microwave generator, several microwave cavity bottles and a refrigeration system disposed within the microwave generator; a temperature sensor and a stirring system are disposed within each microwave cavity bottle; the microwave cavity bottle is connected to a measuring unit via an output pipe; and a liquid injection pipe is disposed at the top of the microwave cavity bottle.

[0009] The measuring unit includes: a chromatograph connected to the output pipe, and a display connected to the chromatograph data;

[0010] The recovery unit includes: a magnetic solid phase extractor, a main infusion pipe connecting the magnetic solid phase extractor and the injection pipe, and a second control valve installed on the main infusion pipe.

[0011] In a preferred embodiment of this invention, the microwave generator has a frequency of 2.45 GHz and a power that is continuously adjustable from 0 to 600 W.

[0012] The cooling system includes: a plurality of fans disposed above the microwave generator and a semiconductor cooling ring arranged around the microwave cavity bottle, wherein the temperature control range of the cooling system is -20°C to 150°C.

[0013] In a preferred embodiment of this utility model, the stirring system includes: a rotating rod disposed at the center of the bottom of the microwave cavity bottle, and a plurality of fan blades disposed on the rotating rod; a rotating motor is disposed at the bottom of the rotating rod, and the rotating shaft of the rotating motor passes through the microwave cavity bottle and is fixedly connected to the rotating rod.

[0014] In a preferred embodiment of this utility model, a drain port is provided on the bottom side of the microwave cavity bottle, the drain port is connected to an output pipe, and a third control valve is provided on the output pipe.

[0015] In a preferred embodiment of this utility model, the inner wall of the microwave cavity bottle is further provided with several protrusions.

[0016] In a preferred embodiment of this invention, the magnetic field strength of the magnetic solid phase extractor is adjustable from 0.5 to 1.2 T, and the magnetic solid phase extractor contains magnetic microspheres with a particle size of 15-25 μm.

[0017] In a preferred embodiment of this utility model, a first control valve is further provided between the measuring unit and the infusion main pipe.

[0018] In a preferred embodiment of this utility model, the control system is electrically connected to the microwave generator, the refrigeration system, the stirring system, the magnetic solid phase extractor, the first control valve, the second control valve, the third control valve, and the display.

[0019] In a preferred embodiment of this invention, a filter is provided at the inlet end of the infusion main.

[0020] This utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0021] (1) This utility model proposes a detection device for ethylene glycol ethers in leather and fur, including a measuring unit, an extraction unit, a recovery unit, and a control system. The extraction unit is equipped with a microwave generator, a microwave cavity bottle, and a refrigeration system. Microwave-assisted extraction accelerates the extraction of ethylene glycol ethers. The stirring system ensures uniform extraction, and the refrigeration system controls the temperature to prevent sample degradation. The measuring unit uses a chromatograph to separate and detect the extract and displays the results on a monitor. The recovery unit uses a magnetic solid-phase extractor and a liquid delivery manifold to realize the recovery and recycling of organic solvents, which improves the extraction efficiency and detection accuracy, reduces the amount of organic solvent used and waste emissions, reduces detection costs, and is also beneficial to environmental protection, realizing the automation and efficiency of the detection process.

[0022] (2) This invention combines a microwave generator with a stirring system. During the extraction process, the microwave generator provides microwave energy to accelerate the extraction of ethylene glycol ethers, while the stirring system ensures thorough mixing of the extraction solvent and the sample. Specifically, the microwave generator generates microwaves that cause the solvent molecules to vibrate rapidly, and the stirring system, through the rotation of the rotating rod and fan blades, ensures full contact between the solvent and the sample. The synergistic effect of both improves the extraction efficiency, enabling ethylene glycol ethers to be extracted from leather and fur samples more quickly and thoroughly. Compared with existing technologies, this invention achieves a more efficient extraction effect.

[0023] (3) The combination of the refrigeration system and the microwave cavity bottle in this invention allows the refrigeration system to continuously function during the extraction process. Its fan and semiconductor cooling ring work together to control the temperature, while the temperature sensor inside the microwave cavity bottle monitors the temperature in real time. When the extraction temperature approaches the set upper limit, the refrigeration system quickly activates, controlling the temperature within the range of -20℃ to 150℃ to prevent sample degradation due to excessive temperature. This ensures the stability and reliability of the extraction process and achieves precise control of the extraction temperature. Compared with existing technologies, this further guarantees the integrity of the sample and the accuracy of the extraction results.

[0024] (4) The combination of the magnetic solid-phase extractor and the infusion manifold in this invention allows the magnetic solid-phase extractor to effectively adsorb ethylene glycol ethers in the extract solution during the recovery process using an adjustable magnetic field strength and internal magnetic spheres. The second control valve on the infusion manifold controls the delivery of the extract solution. Specifically, the extract solution enters the magnetic solid-phase extractor through the infusion manifold, the magnetic spheres adsorb the target substance under the action of the magnetic field, the filter removes impurities, and the organic solvent can be recycled. The combination of the two improves the recovery efficiency, reduces the amount of organic solvent used and waste emissions, and achieves effective recovery and recycling of organic solvents. Compared with the prior art, this further reduces the detection cost and is beneficial to environmental protection. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0026] Figure 1 This is a simplified structural diagram of a preferred embodiment of the present invention;

[0027] Figure 2 This is an internal view of the extraction unit of a preferred embodiment of the present invention;

[0028] Figure 3 This is an external view of the microwave cavity bottle according to a preferred embodiment of the present invention;

[0029] Figure 4 This is an internal view of the microwave cavity bottle according to a preferred embodiment of the present invention;

[0030] In the diagram: 1. Extraction unit; 2. Measurement unit; 3. Recovery unit; 4. Output pipe; 5. First control valve; 6. Second control valve; 7. Infusion main pipe; 8. Injection pipe; 9. Microwave cavity bottle; 10. Third control valve; 11. Rotating rod; 12. Fan blade; 13. Protrusion; 14. Drain port; 15. Semiconductor cooling ring. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0033] like Figure 1 As shown, a device for detecting ethylene glycol ethers in leather and fur includes: a measuring unit 2, an extraction unit 1 and a recovery unit 3 connected to the measuring unit 2; through the efficient synergy of microwave-assisted extraction, magnetic solid-phase extraction purification and chromatographic analysis technologies, rapid and accurate detection of ethylene glycol ethers is achieved; the control system is electrically connected to a microwave generator, a refrigeration system, a stirring system, a magnetic solid-phase extractor, a first control valve 5, a second control valve 6, a third control valve 10 and a display, and controls the operation of the entire device.

[0034] Extraction unit 1 is the core part of this utility model, responsible for extracting ethylene glycol ethers from leather and fur samples. Extraction unit 1 includes: a microwave generator, several microwave cavity bottles 9 disposed in the microwave generator, and a refrigeration system.

[0035] A microwave generator provides microwave energy to accelerate the extraction process of ethylene glycol ethers. Microwaves can rapidly penetrate the sample, causing solvent molecules to vibrate quickly, thereby accelerating the dissolution and extraction of the target substance. Compared to traditional ultrasonic-assisted extraction, microwave-assisted extraction is more efficient and takes less time. The microwave generator operates at a frequency of 2.45 GHz, effectively penetrating the sample. Its power is continuously adjustable from 0-600W to meet the extraction needs of different samples, ensuring both extraction efficiency and sample safety.

[0036] like Figure 2 , 3 As shown in Figure 4, the microwave cavity bottle 9 contains the sample and extraction solvent for microwave-assisted extraction. The microwave cavity bottle 9 is equipped with a temperature sensor and a stirring system to ensure the uniformity and controllability of the extraction process. The bottom of the microwave cavity bottle 9 is provided with a drain port 14, which is tilted at 30°. The drain port 14 is connected to the output pipe 4, and a third control valve 10 is provided on the output pipe 4 to facilitate the discharge and control of the extract.

[0037] The cooling system plays a continuous role throughout the extraction process. The cooling system includes several fans located above the microwave generator and a semiconductor cooling ring 15 arranged around the microwave cavity bottle 9. The fans control large temperature changes, while the semiconductor cooling ring 15 controls small temperature changes. The cooling system has a temperature control range of -20℃ to 150℃, thereby controlling the temperature during the extraction process, preventing sample degradation, and ensuring the stability and reliability of the extraction process.

[0038] During the extraction process, the stirring system operates synchronously to ensure that the extraction solvent and the sample are fully mixed, thereby improving the extraction efficiency. The stirring system includes a rotating rod 11 located at the center of the bottom of the microwave cavity bottle 9, and several fan blades 12 mounted on the rotating rod 11. A rotary motor is located at the bottom of the rotating rod 11, and the shaft of the rotary motor passes through the microwave cavity bottle 9 and is fixedly connected to the rotating rod 11. The stirring system drives the fan blades 12 to rotate through the rotating rod 11, ensuring that the extraction solvent and the sample are in full contact. In addition, several protrusions 13 are also provided on the inner wall of the microwave cavity bottle 9. The protrusions 13 increase the turbulence inside the microwave cavity bottle 9, further increasing the contact area between the extraction solvent and the sample, thereby improving the extraction efficiency and uniformity.

[0039] Leather samples should be taken according to GB / T 39364, and fur samples should be taken according to QB / T 1267. During the sampling process, the fur should be kept intact to avoid damage and prevent interference with the test results due to improper sampling. The obtained leather or fur samples should be pretreated appropriately, such as removing surface impurities or cutting them into pieces.

[0040] The sample is placed in microwave cavity bottle 9; an extraction solution is added, which is anhydrous magnesium sulfate in methanol at a concentration ratio of 1:20, ensuring that the solution can fully cover the sample, which is beneficial to the effective extraction of ethylene glycol ethers. Then, microwave energy is provided by a microwave generator to accelerate the extraction of ethylene glycol ethers, with the temperature not exceeding 50°C. A stirring system ensures that the extraction solvent and sample are fully mixed to improve extraction efficiency, and a cooling system controls the extraction temperature to prevent sample degradation. After extraction, the extract is discharged through drain port 14 and enters the measurement unit 2 for detection.

[0041] Measurement unit 2 is responsible for accurately detecting the extract to determine the content of ethylene glycol ethers. Measurement unit 2 includes a chromatograph connected to output pipe 4 and a display connected to the chromatograph data. The chromatograph separates and detects the ethylene glycol ethers in the extract using gas chromatography-mass spectrometry (GC-MS), which accurately detects the content of ethylene glycol ethers. The chromatograph is equipped with a high-resolution capillary column, which effectively separates the various components of the ethylene glycol ethers, identifying the content of the corresponding ethylene glycol ethers in different microwave cavity vials 9 based on these components.

[0042] The data obtained from the chromatograph is transmitted to the monitor via a data connection. The monitor clearly and intuitively displays the chromatogram, peak area, retention time, and other relevant test results. Operators can easily and quickly obtain the necessary information to accurately determine and analyze the content of ethylene glycol ethers in the sample, facilitating timely implementation of appropriate quality control measures to ensure that the product meets relevant standards and regulatory requirements.

[0043] After the measurement is completed, the control system controls the first control valve 5 to open, and the extract is controlled by the first control valve 5 to be discharged into the recovery unit 3 through the pipeline. The recovery unit 3 is responsible for recovering and processing the organic solvent used in the extraction process, reducing environmental pollution and detection costs. The recovery unit 3 includes: a magnetic solid phase extractor, and a main infusion pipe 7 connecting the magnetic solid phase extractor and the injection pipe 8. A second control valve 6 is provided on the main infusion pipe 7.

[0044] The magnetic field strength of the magnetic solid-phase extractor is adjustable from 0.5 to 1.2 T. By adjusting the magnetic field strength, the adsorption effect can be optimized. The magnetic solid-phase extractor is equipped with magnetic microspheres with a particle size of 15-25 μm, which have a large specific surface area and good adsorption performance. Using magnetic materials as solid-phase extractants, ethylene glycol ethers are effectively adsorbed by the external magnetic field, ensuring the recovery efficiency of different extracts. A second control valve 6 is installed on the main infusion pipe 7 to control the delivery of extract to the injection pipe 8. A filter is installed at the inlet end of the main infusion pipe 7 to further filter impurities in the extract. The injection pipe 8 is located at the top of the microwave cavity bottle 9 and is used to input the extract to extract ethylene glycol ethers, realizing the recycling of organic solvents, reducing the amount of organic solvents used and waste emissions, lowering the detection cost, and also benefiting environmental protection.

[0045] In use, the sample is placed in the microwave cavity bottle 9, and the extraction solution is added. The microwave generator provides energy to accelerate the extraction, while the stirring system ensures uniform mixing and the cooling system controls the temperature to prevent sample degradation. After extraction, the extract is discharged into the measuring unit 2 for chromatographic analysis, and the detection results are displayed on the monitor. Finally, the extract is discharged into the recovery unit 3 for recycling.

[0046] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A device for detecting glycol ether species in leather and fur comprising: A determination unit (2), an extraction unit (1) and a recovery unit (3) connected with the determination unit (2) through a pipeline, and a control system, characterized in that: The extraction unit (1) comprises a microwave generator, a plurality of microwave cavity bottles (9) arranged in the microwave generator, and a refrigeration system; the microwave cavity bottles (9) are provided with temperature sensors and stirring systems; the microwave cavity bottles (9) are connected with the determination unit (2) through an output pipeline (4); the microwave cavity bottles (9) are provided with liquid injection pipes (8) at the top; The determination unit (2) comprises a chromatograph connected with the output pipeline (4), and a display connected with the chromatograph; The recovery unit (3) comprises a magnetic solid phase extractor, and a liquid delivery main pipe (7) connected with the magnetic solid phase extractor and the liquid injection pipe (8), and the liquid delivery main pipe (7) is provided with a second control valve (6).

2. A device for detecting glycol ether substances in leather and fur according to claim 1, characterized in that: The microwave generator has a frequency of 2.45 GHz and a power of 0-600 W which is continuously adjustable.

3. The device for detecting glycol ethers in leather and fur according to claim 1, characterized in that: The refrigeration system comprises a plurality of fans arranged above the microwave generator and a semiconductor refrigeration ring (15) arranged around the microwave cavity bottles (9), and the refrigeration system has a temperature control range of-20-150 ℃.

4. The device for detecting glycol ethers in leather and fur according to claim 1, characterized in that: The stirring system comprises a rotating rod (11) arranged at the center of the bottom of the microwave cavity bottles (9) and a plurality of fan blades (12) arranged on the rotating rod (11); the rotating rod (11) is fixedly connected with the rotating motor through the rotating shaft of the rotating motor arranged at the bottom of the rotating rod (11).

5. The device for detecting glycol ethers in leather and fur according to claim 1, characterized in that: The microwave cavity bottles (9) are provided with liquid discharge ports (14) at the side bottom, the liquid discharge ports (14) are connected with the output pipeline (4), and the output pipeline (4) is provided with a third control valve (10).

6. The device for detecting glycol ethers in leather and fur according to claim 1, characterized in that: The inner wall of the microwave cavity bottles (9) is further provided with a plurality of protrusions (13).

7. The device for detecting glycol ethers in leather and fur according to claim 1, characterized in that: The magnetic solid phase extractor has a magnetic field strength of 0.5-1.2 T which is adjustable, and the magnetic solid phase extractor is provided with magnetic small balls with a particle size of 15-25 μm.

8. A device for detecting glycol ethers in leather and fur according to claim 5, characterized in that: The determination unit (2) is further provided with a first control valve (5) connected with the liquid delivery main pipe (7).

9. A device for detecting glycol ethers in leather and fur according to claim 8, characterized in that: The control system is electrically connected with the microwave generator, the refrigeration system, the stirring system, the magnetic solid phase extractor, the first control valve (5), the second control valve (6), the third control valve (10), and the display.

10. The device for detecting glycol ethers in leather and fur according to claim 1, characterized in that: The input end of the liquid delivery main pipe (7) is provided with a filter.

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