Device and method for rapidly detecting impurities in toluene transportation and transfer

Abstract

According to the device and the method for rapidly detecting the impurities in the toluene transportation and transfer, after a toluene sample is loaded into a centrifugal tube with an impurity detection reagent, the impurity detection reagent is rapidly detected under the action of a portable centrifugal machine; a non-professional person can rapidly and qualitatively judge the impurities in a toluene sample by observing the change condition of the impurity detection reagent and the distribution of mechanical impurity particles on the surface of the porous partition plate, the operation is simple, various impurities in toluene can be timely, conveniently and rapidly qualitatively determined in the toluene transportation and transfer process, the result is rapid and visual, and the detection accuracy is high. Professional analysis and detection personnel are not needed, and the efficiency of impurity detection in toluene transportation and transfer is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of toluene impurity detection, and in particular to a device and method for quickly detecting impurities in toluene transportation and transshipment. Background Art

[0002] Toluene is a colorless, volatile liquid with a special aromatic smell, belonging to the aromatic hydrocarbons. Toluene is widely used as an organic solvent and a raw material for the synthesis of medicines, coatings, resins, dyes, explosives and pesticides. It can also be used as a standard substance and analytical reagent for chromatographic analysis. Toluene is an important chemical material and can be used as a raw material for the production of benzene and many other chemical products. At present, domestic toluene users are widely distributed, and toluene is mostly transported to downstream manufacturers in various places by shipping, tank trucks and other means for use.

[0003] The main means of transportation for the petrochemical product toluene are shipping and tank trucks. The capacity and efficiency of shipping are very advantageous. Due to sailing and loading and unloading on the sea or rivers, the moisture content in shipping toluene is often prone to increase, and transport ships often need to switch to shipping other organic substances due to order requirements, which makes it easy for other impurities such as benzene, xylene, alcohol, ester, etc. to be mixed in when transporting toluene. Similarly, tank trucks sometimes transport other materials due to business needs, and the mixing and switching process is not completely cleaned, which may cause a small amount of other organic materials or inorganic acids, metal salts, etc. to be brought in when shipping toluene. In addition, other factors may cause the introduction of other materials outside the system or mechanical impurities, resulting in the risk of exceeding the impurity content, moisture, trace impurities and other indicators of shipping toluene, affecting the direct use of downstream manufacturers. Summary of the invention

[0004] The present invention provides a device and method for quickly detecting impurities in toluene transportation and transshipment, which are used to solve the technical problem of how to enable non-professionals to quickly and portablely detect multiple impurities in toluene samples.

[0005] In order to solve the above technical problems, the following technical solutions are proposed:

[0006] In a first aspect, an embodiment of the present application provides a device for quickly detecting impurities in toluene transportation and transshipment, which is used to detect impurities in a toluene sample, comprising:

[0007] Centrifuge tubes;

[0008] A porous partition is arranged in the centrifuge tube, and the centrifuge tube is separated into a sample chamber and a detection chamber by the porous partition; due to the low density of toluene, various impurities and water will be enriched in the lower part of the centrifuge tube after centrifugation. The porous partition effectively prevents the impurity sample enriched in the detection chamber after centrifugation from returning to the sample chamber after standing, resulting in impurity enrichment failure, and the inability to quickly and efficiently reflect the true content of impurities on the detection reagent in the detection chamber.

[0009] An impurity detection reagent, which is disposed in the detection chamber and is used to detect impurities entering the detection chamber;

[0010] A centrifuge is connected to the centrifuge tube and is used to drive the centrifuge tube to rotate. The centrifuge can be powered by a household power supply or a vehicle power supply.

[0011] In some embodiments, a partition plate is further included, which is disposed in the detection chamber and divides the detection chamber into a plurality of partition chambers for storing the impurity detection reagents.

[0012] In some embodiments, the partition plate is in a cross-shaped structure.

[0013] In some embodiments, the impurity detection reagent includes one or more of color-changing silica gel particles, pH test paper, anhydrous ammonium cerium nitrate powder, and citric acid.

[0014] In some embodiments, the porous separator is a microporous filtration membrane.

[0015] In some embodiments, the porous partition is one of a polypropylene microporous filtration membrane, a polyethylene microporous filtration membrane, and a polytetrachloroethylene microporous filtration membrane.

[0016] In some embodiments, the porous separator is preferably the polypropylene microporous filtration membrane.

[0017] In some embodiments, the centrifuge is of portable design.

[0018] In a second aspect, the embodiments of the present application further provide a method for rapidly detecting impurities in toluene transportation and transshipment, wherein the impurities in a toluene sample are detected by using the device for rapidly detecting impurities in toluene transportation and transshipment described in any one of the above items; the method comprises the following steps:

[0019] Obtain a toluene sample, and place the toluene sample in a sample chamber of a centrifuge tube;

[0020] Place the centrifuge tube in the centrifuge and set the operating parameters of the centrifuge;

[0021] After the centrifuge has finished running according to the operating parameters, taking out the centrifuge tube;

[0022] Observe the changes in the impurity detection reagent in the centrifuge tube to determine the impurities in the toluene sample.

[0023] In some embodiments, the operating parameters include rotation speed and rotation time;

[0024] Wherein, the rotation speed is 1000-2000 rpm;

[0025] The turning time is 2-5 minutes.

[0026] Beneficial effect: The present application provides a device and method for rapidly detecting impurities in toluene transportation and transshipment. After the toluene sample is loaded into a centrifuge tube with an impurity detection reagent and under the action of a centrifuge, non-professionals can directly determine whether there are impurities in the toluene sample by observing the changes in the impurity detection reagent and the distribution of particles on the surface of the porous partition. Not only is the operation step simple, it can detect impurities in toluene in a timely, convenient and rapid manner during the transportation and transshipment of toluene, and it can also intuitively display the test results, greatly reducing the difficulty of detecting toluene impurities. There is no need to send the sample to a professional analysis laboratory, and there is no need for professional analysis and detection personnel to perform detection on professional equipment such as gas chromatography. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the overall structure of a device for rapidly detecting impurities in toluene transportation and transshipment provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a centrifuge tube provided in an embodiment of the present application;

[0029] Figure 3 A schematic structural diagram of a partition plate provided in an embodiment of the present invention.

[0030] Description of Reference Numerals

[0031] 1. Centrifuge; 2. Centrifuge tube; 3. Porous partition; 4. Partition plate; 5. Sample chamber; 6. Detection chamber. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] Toluene is a colorless, volatile liquid with a special aroma, belonging to the aromatic hydrocarbons. Toluene is widely used as an organic solvent and a raw material for the synthesis of medicines, coatings, resins, dyes, explosives and pesticides. It can also be used as a chromatographic analysis standard substance and analytical reagent; toluene is an important chemical material and can be used as a raw material for the production of benzene and many other chemical products. At present, domestic toluene users are widely distributed, so toluene products are mostly used by downstream manufacturers in various places through transportation.

[0041] The main means of transportation for the petrochemical product toluene are shipping and tank trucks, and the capacity and efficiency of shipping are very advantageous. Due to the navigation and loading and unloading process on the sea or river, the moisture content in the shipping toluene is often easy to increase, and the transport ships often need to switch to transport other organic substances due to order requirements, which makes it easy for other impurities such as benzene, xylene, alcohol, ester, etc. to be mixed in when transporting toluene. Similarly, tank trucks sometimes transport other materials due to business needs. This mixing process is difficult to clean thoroughly, resulting in the introduction of a small amount of other organic materials or inorganic acids, metal salts, etc. when shipping toluene. In addition, other factors may introduce other materials outside the system or mechanical impurities, resulting in the risk of exceeding the impurity content, moisture, trace impurities and other indicators of shipping toluene, affecting the direct use of downstream manufacturers.

[0042] In order to solve the technical problem that impurities in toluene cannot be detected in a timely, convenient and rapid manner during the transportation and transshipment of toluene, the present application provides a device and a method for rapidly detecting impurities in toluene during the transportation and transshipment of toluene. After the toluene sample is loaded into a centrifuge tube 2 with an impurity detection reagent, and under the action of a centrifuge 1, the impurities in the toluene sample can be centrifuged from the toluene to penetrate the diaphragm and be enriched in the lower part, and are identified by the impurity detection reagent. The entire process from sampling, testing and obtaining results can be completed within 10 minutes, thereby achieving the technical effect of being able to detect impurities in toluene in a timely, convenient and rapid manner during the transportation and transshipment of toluene.

[0043] Please refer to Figure 1 and Figure 2 , Figure 1 and Figure 2 The present invention provides a schematic diagram of the overall structure of a device for quickly detecting impurities in toluene transportation and transshipment and a schematic diagram of the structure of a centrifuge tube, respectively, for detecting impurities in a toluene sample, including a centrifuge tube 2, a porous partition 3, an impurity detection reagent and a centrifuge 1, wherein the porous partition 3 is arranged in the centrifuge tube 2, and the centrifuge tube 2 is separated into a sample chamber 5 and a detection chamber 6 by the porous partition 3; the impurity detection reagent is arranged in the detection chamber, and is used to detect impurities entering the detection chamber 6; the centrifuge 1 is connected to the centrifuge tube 2, and is used to drive the centrifuge tube 2 to rotate.

[0044] Specifically, during the transportation and transshipment of toluene, there are two main types of impurities mixed into toluene. One is the mechanical impurities generated by the carrier or transshipment device during the transportation and transshipment of toluene. This type of impurities is generally mixed in toluene in the form of particles. The other is due to the fact that the moisture content of the shipped toluene is easily increased during navigation and loading and unloading on the sea or river, and the transport ship often needs to switch to transporting other organic matter due to order demand, which makes it easy for other impurities to be mixed into toluene during transportation, such as benzene, xylene, alcohol, ester, etc.; similarly, tank trucks sometimes transport other materials due to business needs. The mixing process is not thoroughly cleaned, resulting in a small amount of other organic materials or inorganic acids, metal salts, etc. being brought in when shipping toluene. These impurities are miscible with toluene and have a low content. In the analytical laboratory, they need to be traced by professional instruments such as gas chromatography. In the process of transporting and transshipping toluene, non-professionals obtain toluene samples from tank-transported toluene or ship-transported toluene. After the staff puts the toluene sample into the sample chamber 5 of the centrifuge tube 2, the centrifuge tube 2 is placed in the centrifuge 1. After the staff starts the centrifuge 1, the mechanical impurities in the toluene sample will be separated from the toluene sample under the action of the centrifuge 1 and enriched on the surface of the porous partition 3. After the impurity detection reagent in the detection chamber 6 contacts the sample centrifugally enriched in the lower part of the toluene, the staff can judge the situation of impurities such as water, unsaturated organic matter, alcohol, ester, and metal salt in the toluene sample by observing the changes in the impurity detection reagent. In this embodiment, the staff can directly judge whether there are corresponding impurities in the toluene sample by observing the changes in the impurity detection reagent and the distribution of particles on the surface of the porous partition 3. Not only is the operation step simple, it can detect impurities in toluene in a timely, convenient, and rapid manner during the transportation and transshipment of toluene, and it can also intuitively display the test results within a few minutes, greatly improving the efficiency of detecting impurities in toluene transportation and transshipment.

[0045] Furthermore, in the embodiment of the present application, a partition plate 4 is also provided in the centrifuge tube 2, and the partition plate 4 is arranged in the detection chamber 6, and divides the detection chamber 6 into a plurality of partition chambers for storing impurity detection reagents. During use, by placing different types of impurity detection reagents in each partition chamber, the staff can simultaneously detect multiple impurities in the toluene sample during the process of checking the impurities in the toluene sample, which not only greatly reduces the difficulty of the staff in detecting multiple impurities in the toluene sample, but also further improves the staff's detection speed.

[0046] For further information, please refer to Figure 3In the embodiment of the present application, the partition plate 4 is set to a cross-shaped structure, and the detection chamber 6 is evenly divided into four groups of separation chambers by the partition plate 4 with a cross-shaped structure. It is not only convenient for the staff to observe the changes of the impurity detection reagents in the separation chamber, but also the partition plate 4 with a cross-shaped structure is easy to produce and assemble, which greatly reduces the production difficulty and cost of the centrifuge tube 2.

[0047] Furthermore, in an embodiment of the present application, the impurity detection reagent includes one or more of color-changing silica gel particles, pH test paper, anhydrous ammonium cerium nitrate powder, and citric acid.

[0048] Among them, color-changing silica gel particles can be used to detect the moisture content in toluene samples. By observing whether the color-changing silica gel will change from blue to pink and the speed of color change after the toluene sample is centrifuged and allowed to stand, the approximate moisture content in the toluene can be quickly and qualitatively determined to determine whether it exceeds the standard.

[0049] pH test paper can be used to detect acidic and alkaline impurities in toluene samples. By observing the color change of pH test paper after centrifugation of toluene samples, if the pH test paper turns orange or red, it indicates that toluene contains acidic substances, and if it turns deep green or blue, it indicates that toluene contains alkaline substances. Based on this, it is possible to quickly determine whether toluene is contaminated by acidic or alkaline substances.

[0050] Anhydrous ammonium cerium nitrate powder is an inorganic compound with a chemical formula of (NH4)2Ce(NO3)6, and is an orange-red crystalline powder. The anhydrous ammonium cerium nitrate powder will undergo rapid color change, turbidity or decomposition reactions after contacting with unsaturated organic matter, alcohols, esters and other easily oxidizable substances. Therefore, based on the above changes, in this embodiment, by observing the degree and speed of change of the ammonium cerium nitrate powder after contacting toluene after centrifugation, it is quickly judged whether there are easily oxidizable substances such as unsaturated organic matter, alcohols, esters and the like in toluene.

[0051] Citric acid, also known as citric acid, has a molecular formula of C6H8O7 and is an important organic weak acid. Citrate ions can form complexes with metal cations. Therefore, in this embodiment, by observing the changes in the citric acid powder in the separation chamber after contact with toluene after centrifugation, or the color change and color change speed of the toluene solution in the citric acid powder area, it is confirmed whether there is a complexation effect between metal salts and citric acid, and then quickly judge whether there are metal salts such as iron and aluminum in toluene.

[0052] In this embodiment, the number of types and quantities of impurity detection reagents can be selected according to the number of separation chambers, thereby realizing the detection of multiple impurities in the toluene sample at the same time.

[0053] Furthermore, in the embodiment of the present application, the porous partition 3 is a microporous filtration membrane, which has a more uniform pore size distribution and can provide a higher filtration accuracy, thereby being able to enrich the finer mechanical impurities in the toluene sample on the surface of the porous partition 3, thereby enabling non-professionals to quickly determine the situation of mechanical impurities in the toluene sample.

[0054] In this embodiment, the microporous filtration membrane can be selected from one of polypropylene microporous filtration membrane, polyethylene microporous filtration membrane and polytetrachloroethylene microporous filtration membrane.

[0055] Among them, the polypropylene microporous filtration membrane is made of hot-melt bonding of polypropylene ultrafine fibers. It belongs to a deep filtration membrane material with stable physical and chemical properties, good compatibility, a variety of pore sizes, high porosity, large dirt holding capacity, ability to be backflushed and sterilized at high temperature, and good pressure resistance.

[0056] The polyethylene microporous filtration membrane is made of polyethylene material and has excellent chemical stability, corrosion resistance and non-polar surface. It contains a micron-level pore structure inside, which can achieve fine filtration of suspended matter, fine particles, colloid substances, etc., ensuring high filtration accuracy.

[0057] Polytetrachloroethylene microporous filtration membrane has the characteristics of high particle retention rate, good temperature resistance, resistance to strong acids, alkalis, organic solvents and oxidants, aging resistance, non-stick, non-flammable, non-toxic and biocompatible.

[0058] In this embodiment, the staff can make a selection based on the respective characteristics of the polypropylene microporous filtration membrane, the polyethylene microporous filtration membrane and the polytetrachloroethylene microporous filtration membrane, thereby being able to more accurately detect impurities in the toluene sample.

[0059] Furthermore, in the embodiment of the present application, the porous partition 3 is preferably a polypropylene microporous filtration membrane. The polypropylene microporous filtration membrane is stable in acidic and alkaline environments and is cheap. The mechanical strength of polypropylene is relatively high, so that the polypropylene microporous filtration membrane can withstand a certain pressure and mechanical stress during the filtration process, thereby ensuring that the porous partition 3 will not be damaged during the centrifugation process.

[0060] Furthermore, in the embodiment of the present application, the centrifuge 1 is of portable design, and the centrifuge 1 can be powered by a household power supply or a vehicle power supply, so that non-professionals can use it conveniently in an outdoor environment.

[0061] In a second aspect, a method for rapidly detecting impurities in toluene transportation and transit is also provided in an embodiment of the present application, wherein a toluene sample is detected by any of the above-mentioned devices for rapidly detecting impurities in toluene transportation and transit; the method comprises the following steps:

[0062] Obtain a toluene sample, and place the toluene sample in the sample chamber 5 of the centrifuge tube 2;

[0063] Place the centrifuge tube 2 in the centrifuge 1 and set the operating parameters of the centrifuge 1;

[0064] After the centrifuge 1 has finished running according to the operating parameters, the centrifuge tube 2 is taken out;

[0065] Observe the changes of the impurity detection reagent in the centrifuge tube 2 to determine the impurities in the toluene sample.

[0066] Furthermore, in an embodiment of the present application, the operating parameters include a rotation speed and a rotation time; wherein the rotation speed is 1000-2000 revolutions per minute; the rotation time is 2-5 minutes. During use, the staff controls the centrifuge 1 to run at a speed of 1000-2000 revolutions per minute for 2-5 minutes, so that all possible impurities in the toluene are enriched in the lower layer of the centrifuge tube 2, so as to quickly analyze whether the toluene is contaminated during transportation.

[0067] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A device for quickly detecting impurities in toluene transportation and transshipment, used for detecting impurities in toluene samples, characterized in that: include: Centrifuge tubes; A porous partition, which is arranged in the lower middle part of the centrifuge tube, and the centrifuge tube is separated into a sample chamber and a detection chamber by the porous partition; An impurity detection reagent, which is disposed in the detection chamber and is used to detect impurities that enter the detection chamber and are enriched after centrifugation; A centrifuge, wherein the centrifuge tube is placed in the centrifuge.

2. The device for rapid detection of impurities in toluene transportation and transshipment according to claim 1, characterized in that: A plurality of partition plates are arranged in the centrifuge tube, and the partition plates are arranged in the detection cavity and divide the detection cavity into a plurality of partition chambers for storing the impurity detection reagents for detecting different impurities.

3. The device for rapid detection of impurities in toluene transportation and transshipment according to claim 2, characterized in that: Two partition plates are arranged in the centrifuge tube, and the two partition plates are arranged in a cross-shaped structure.

4. The device for rapid detection of impurities in toluene transportation and transshipment according to claim 1, characterized in that: The impurity detection reagent includes one or more of color-changing silica gel particles, pH test paper, anhydrous cerium ammonium nitrate powder, and citric acid.

5. The device for rapid detection of impurities in toluene transportation and transshipment according to claim 1, characterized in that: The porous partition is a microporous filtration membrane.

6. The device for rapid detection of impurities in toluene transportation and transshipment according to claim 5, characterized in that: The porous partition is one of a polypropylene microporous filtration membrane, a polyethylene microporous filtration membrane, and a polytetrachloroethylene microporous filtration membrane.

7. The device for rapid detection of impurities in toluene transportation and transshipment according to claim 5, characterized in that: The porous partition is the polypropylene microporous filtration membrane.

8. The device for rapid detection of impurities in toluene transportation and transshipment according to claim 1, characterized in that: The centrifuge is of portable design.

9. A method for rapid detection of impurities in toluene transportation and transshipment, characterized in that: The impurities in the toluene sample are detected by the device for rapid detection of impurities in toluene transportation and transshipment according to any one of claims 1 to 8; comprising the following steps: Obtain toluene samples from tank trucks and storage tanks, and place the toluene samples in the sample chamber of a centrifuge tube; Place the centrifuge tube in the centrifuge and set the operating parameters of the centrifuge; After the centrifuge has finished running according to the operating parameters, taking out the centrifuge tube; Observe the changes in the impurity detection reagent in the centrifuge tube to determine the impurities in the toluene sample.

10. The method for rapid detection of impurities in toluene transportation and transshipment according to claim 9, characterized in that: The operating parameters include rotation speed and rotation time; Wherein, the rotation speed is 1000-2000 rpm; The turning time is 2-5 minutes.

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