Xylene dehydration device

Abstract

The utility model discloses a xylene dehydration device and relates to the technical field of chemical production. The xylene dehydration device comprises a separator and a dryer; the separator is provided with a first liquid inlet and an overflow port, and the first liquid inlet is communicated with the liquid inlet pipe; the dryer is provided with a second liquid inlet and a first liquid outlet, the second liquid inlet is located in the lower side of the dryer, the first liquid outlet is located in the upper side of the dryer, and the second liquid inlet is communicated with the overflow port through an overflow pipe; according to the xylene dehydration device provided by the utility model, when the xylene to be dehydrated and dried is dehydrated and dried, the xylene raw material is firstly put into the separator to be mixed with the pure water, then the xylene and the pure water can be layered by standing, and trace moisture and impurities in the xylene raw material are separated to a pure water layer; and the dimethylbenzene on the upper layer is input into the dryer in an overflow manner through the overflow pipe, so that the residual pure water in the dimethylbenzene can be dried, and the dimethylbenzene can be dehydrated and dried.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to a xylene dehydration device. Background Art

[0002] When triazines are used in the Friedel-Crafts reaction, the use of solvent xylene is a common choice, but this process requires that xylene must remain anhydrous, that is, its moisture content needs to be strictly controlled below 0.05%. Such low moisture requirements are crucial to ensure the smooth progress of the reaction and the quality of the product. However, if conventional distillation methods are used to dehydrate xylene, it is often difficult to meet this stringent moisture control standard. Although conventional distillation can remove some of the moisture in the solvent to a certain extent, the removal effect of trace moisture is not ideal, and it is difficult to meet the high purity requirements of the solvent for the Friedel-Crafts reaction of triazines.

[0003] On the other hand, if new, unused xylene is used as the solvent to ensure that xylene is anhydrous, the cost of the raw materials will increase greatly. The purchase price of new xylene is relatively high, especially when a large amount of xylene is needed, the cost pressure will be particularly obvious. Therefore, in actual production, it is particularly important to find a method that can effectively remove water from xylene while controlling costs. Utility Model Content

[0004] In view of this, the purpose of the present invention is to overcome the deficiencies in the related art. The present invention provides a xylene dehydration device.

[0005] The utility model provides the following technical solutions:

[0006] A xylene dehydration device is used for dehydrating and drying xylene, comprising a separator, a dryer and a temporary storage tank.

[0007] The separator is filled with pure water. The separator has a first liquid inlet and an overflow port. The first liquid inlet is connected to a liquid inlet pipe, and xylene to be dehydrated and dried can be transported into the separator through the liquid inlet pipe; the dryer has a second liquid inlet and a first liquid outlet. The second liquid inlet is located at the lower side of the dryer, and the first liquid outlet is located at the upper side of the dryer. The second liquid inlet is connected to the overflow port through an overflow pipe; a third liquid inlet is provided on the upper side of the temporary storage tank, and a second liquid outlet is provided on the lower side of the temporary storage tank. The third liquid inlet is connected to the first liquid outlet through a liquid infusion pipe; a liquid level meter is provided on the side wall of the temporary storage tank.

[0008] As a further improvement of the above technical solution, the temporary storage tank is provided with a first constant pressure tube, one end of the first constant pressure tube is connected to the upper end of the temporary storage tank, and the other end of the first constant pressure tube is connected to the upper end of the dryer; the upper end of the temporary storage tank is connected with a first external pipe, and the temporary storage tank is connected to the outside atmosphere through the first external pipe.

[0009] As a further improvement of the above technical solution, a drain pipe is connected to the bottom of the separator.

[0010] As a further improvement of the above technical solution, the drain pipe has a curved portion, and the highest point of the curved portion is lower than the setting position of the overflow port.

[0011] As a further improvement of the above technical solution, a second constant pressure tube is connected to the drain pipe and the liquid inlet pipe, and the end of the second constant pressure tube facing away from the drain pipe is connected to the top of the separator; the upper end of the separator is connected to a second external tube, and the separator is connected to the outside atmosphere through the second external tube.

[0012] As a further improvement of the above technical solution, the ends of the first constant pressure tube and the second constant pressure tube connected to the atmosphere are both bent.

[0013] As a further improvement of the above technical solution, the dryer is filled with anhydrous calcium chloride.

[0014] As a further improvement of the above technical solution, sewage outlets are provided at the bottom of the separator and the dryer.

[0015] As a further improvement of the above technical solution, a flow rate pump is installed on the liquid inlet pipe.

[0016] Compared with the related art, the beneficial effects of the utility model are:

[0017] The xylene dehydration device provided by the utility model is intended to complete the dehydration and drying process of xylene to meet the requirements of chemical production. When xylene needs to be dehydrated, the device first introduces the xylene liquid from the xylene receiving tank after distillation into the separator through the liquid inlet pipe. In the separator, the xylene will be mixed with the pre-injected pure water. After the mixed xylene and pure water are left standing in the separator for a period of time, stratification will naturally occur. Since the density of xylene is less than that of water, it will float on the upper layer, while the water phase containing trace moisture and impurities in the xylene to be treated is deposited on the lower layer. Such a stratification effect ensures that moisture and impurities can be dissolved in pure water, creating favorable conditions for the subsequent purification of xylene.

[0018] As the xylene to be processed is continuously fed into the separator, the pure xylene in the upper layer after oil-water separation will smoothly and continuously overflow into the dryer with the help of the overflow pipe design. In the dryer, the xylene will undergo further drying to ensure that the water it contains is finally removed. This series of processing steps not only ensures the dehydration quality of xylene, but also improves the dehydration efficiency, making it meet the requirements of chemical production for raw material dryness.

[0019] When the xylene in the dryer is dried, it will be discharged smoothly through the first liquid outlet and enter the third liquid inlet of the temporary storage tank along the infusion tube. In the temporary storage tank, the dried xylene can be temporarily stored and kept, which provides guarantee for the continuous operation of the utility model; the user can take out the required amount of xylene through the second liquid outlet at any time for subsequent operations according to the actual production needs or work plan; in addition, the operator only needs to observe the reading of the liquid level meter to understand the current stock of xylene material in the temporary storage tank. Such a design not only saves the operator's time and energy, but also avoids the safety risks that may be caused by frequently opening the temporary storage tank cover.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a xylene dehydration device in an embodiment of the utility model is shown.

[0023] Description of main component symbols:

[0024] 100-separator; 110-first liquid inlet; 111-liquid inlet pipe; 112-flow pump; 120-overflow port; 130-drain pipe; 131-bend; 140-second constant pressure pipe; 150-second external pipe; 160-drain outlet; 200-dryer; 210-second liquid inlet; 211-overflow pipe; 220-first liquid outlet; 300-temporary storage tank; 310-third liquid inlet; 311-infusion pipe; 320-second liquid outlet; 330-liquid level meter; 340-first constant pressure pipe; 350-first external pipe. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] like Figure 1 As shown, an embodiment of the utility model provides a xylene dehydration device for dehydrating and drying xylene, comprising a separator 100, a dryer 200, and a temporary storage tank 300.

[0031] The separator 100 is filled with pure water. The separator 100 has a first liquid inlet 110 and an overflow port 120. The first liquid inlet 110 is connected to a liquid inlet pipe 111, and the xylene to be dehydrated and dried can be transported into the separator 100 through the liquid inlet pipe 111; the dryer 200 has a second liquid inlet 210 and a first liquid outlet 220. The second liquid inlet 210 is located at the lower side of the dryer 200, and the first liquid outlet 220 is located at the upper side of the dryer 200. The second liquid inlet 210 is connected to the overflow port 120 through the overflow pipe 211; the upper side of the temporary storage tank 300 is provided with a third liquid inlet 310, and the lower side of the temporary storage tank 300 is provided with a second liquid outlet 320. The third liquid inlet 310 is connected to the first liquid outlet 220 through a liquid infusion pipe 311; a liquid level meter 330 is provided on the side wall of the temporary storage tank 300.

[0032] The xylene dehydration device provided in this embodiment, when it is necessary to dehydrate xylene, the device first smoothly introduces the xylene liquid from the distilled xylene receiving tank into the separator 100 through the liquid inlet pipe 111. In the separator 100, xylene will be mixed with the pre-injected pure water. After a period of standing in the separator 100, the mixed xylene and pure water will naturally stratify. Due to the physical properties of xylene, that is, its density is less than that of water and there is incompatibility between the two, after mixing xylene with pure water, obvious stratification will be observed. Specifically, xylene will naturally float on the upper layer of the mixed liquid due to its lighter density. Relatively speaking, those water phases containing trace moisture and other impurities that may exist in the xylene to be treated will be deposited in the lower layer of the mixed liquid due to their high density. Such a stratification effect ensures that moisture and impurities can be dissolved in pure water, creating conditions for subsequent xylene purification.

[0033] As the xylene to be processed is continuously input into the separator 100, the pure xylene in the upper layer after oil-water separation will smoothly and continuously overflow into the dryer 200 with the help of the overflow pipe 211. In the dryer 200, the xylene will undergo further drying treatment to ensure that the water contained in it is finally removed thoroughly and efficiently. This series of processing steps not only ensures the dehydration quality of xylene, but also improves the dehydration efficiency, so that it meets the requirements of chemical production for the dryness of raw materials.

[0034] When the xylene in the dryer 200 is dried, it will be discharged smoothly through the first liquid outlet 220 and enter the third liquid inlet 310 of the temporary storage tank 300 along the infusion tube 311. In the temporary storage tank 300, the dried xylene can be temporarily stored and kept, which provides guarantee for the continuous operation of this embodiment; the user can take out the required amount of xylene through the second liquid outlet 320 at any time for subsequent operations according to the actual production needs or work plan; in addition, the operator only needs to observe the reading of the liquid level meter 330 to understand the current stock of xylene material in the temporary storage tank 300. Such a design not only saves the operator's time and energy, but also avoids the safety risks that may be caused by frequently opening the cover of the temporary storage tank 300.

[0035] In some specific embodiments, the temporary storage tank 300 is provided with a first constant pressure tube 340, one end of the first constant pressure tube 340 is connected to the upper end of the temporary storage tank 300, and the other end of the first constant pressure tube 340 is connected to the upper end of the dryer 200. Such a design forms an air pressure balance channel between the temporary storage tank 300 and the dryer 200, ensuring the constant air pressure inside the two. In actual operation, when the xylene in the dryer 200 is discharged to the temporary storage tank 300, due to the balancing effect of the air pressure, problems such as poor discharge or blockage caused by the difference in air pressure can be avoided, thereby ensuring the smoothness of the discharge of xylene. The upper end of the temporary storage tank 300 is connected with a first external pipe 350, and the temporary storage tank 300 is connected to the outside atmosphere through the first external pipe 350, thereby adjusting and balancing the air pressure inside the temporary storage tank 300. When the air pressure inside the temporary storage tank 300 and the dryer 200 is too high, the external pipe can allow part of the gas to escape to maintain the stability of the air pressure; when the air pressure is too low, the outside air can enter the temporary storage tank 300 and the temporary storage tank 300 through the external pipe to supplement the insufficient air pressure, so that the air pressure between the temporary storage tank 300, the dryer 200 and the atmosphere remains balanced and consistent, so that the transportation of xylene remains stable.

[0036] Such a design not only ensures the constant internal air pressure of the temporary storage tank 300 and the dryer 200, but also improves the smoothness of the discharge of xylene from the dryer 200 to the temporary storage tank 300. In practical applications, this innovative design improves the reliability and stability of the entire xylene dehydration device.

[0037] In some specific embodiments, the bottom of the separator 100 is connected to a drain pipe 130; specifically, when xylene is dehydrated through the separator 100, the pure water in the separator 100 absorbs the water carried by the xylene. As the treatment process continues, the amount of pure water in the separator 100 will gradually increase, and at the same time, the absorbed water will also increase. If this part of the excess water cannot be discharged in time, it may affect the dehydration effect of the separator 100, and may even cause the separator 100 to malfunction.

[0038] In order to avoid this situation, a drain pipe 130 is connected to the bottom of the separator 100. The function of the drain pipe 130 is to drain the excess water in the separator 100 in a timely manner, thereby ensuring that the amount of water in the separator 100 is always kept within a reasonable range. In actual operation, the operator only needs to open the drain pipe 130 regularly to drain the excess water, and the operation process is simple and convenient.

[0039] In addition, this design also fully considers the needs of environmental protection and energy saving. Since the drain pipe 130 can drain the excess water in time, the waste of water and the pollution of the environment are avoided. At the same time, since the amount of water inside the separator 100 is always kept within a reasonable range, the dehydration effect and operation efficiency of the separator 100 are also ensured, thereby achieving the goal of energy saving and consumption reduction.

[0040] In some specific embodiments, the drain pipe 130 has a curved portion 131, and the highest point of the curved portion 131 is slightly lower than the setting position of the overflow port 120; such a design enables the excess water in the separator 100 to be automatically discharged through the drain pipe 130 when the liquid level in the separator 100 gradually rises and reaches or exceeds the highest point of the curved portion 131. This automatic drainage process does not require any manual operation by personnel, which saves manpower and improves the use efficiency of the entire dehydration device.

[0041] In actual application, as xylene is dehydrated through the separator 100, the liquid level in the separator 100 will continue to rise. When the liquid level rises to the highest point of the curved portion 131, due to the effect of gravity, the excess water will be smoothly discharged along the curved portion 131 of the drain pipe 130. In this process, the curved portion 131 of the drain pipe 130 plays a guiding role, ensuring that the water can flow out smoothly without being retained in the separator 100.

[0042] In addition, since the drainage process is fully automatic, the operator does not need to always pay attention to the liquid level in the separator 100, nor does it need to frequently perform manual drainage operations. This not only reduces the workload of the operator, but also improves the operational stability and reliability of the entire dehydration device.

[0043] In some specific embodiments, the drain pipe 130 and the liquid inlet pipe 111 are both connected with a second constant pressure pipe 140, and the end of the second constant pressure pipe 140 away from the drain pipe 130 is connected to the top of the separator 100; the upper end of the separator 100 is connected with a second external pipe 150, and the separator 100 is connected to the outside atmosphere through the second external pipe 150; in actual operation, when xylene enters the separator 100 through the liquid inlet pipe 111 for dehydration, the air pressure inside the device may change with the rise and fall of the liquid level and the discharge of water. However, due to the provision of the second constant pressure pipe 140 and the second external pipe 150, these air pressure changes can be balanced and adjusted in time. Therefore, whether it is the liquid inlet process or the drainage process, the air pressure between the drain pipe 130, the separator 100 and the atmosphere can be kept balanced and consistent, so that the transportation of xylene remains stable, thereby improving the operating efficiency and stability of the entire dehydration device.

[0044] Specifically, the arrangement of the first constant pressure tube 340, the second constant pressure tube 140 and the first external tube 350, the second external tube 150 can ensure that the air pressure between the various devices in this embodiment is balanced with the air pressure of the atmosphere, ensuring that the liquid can be smoothly transmitted between the various devices.

[0045] In some specific embodiments, the ends of the first constant pressure tube 340 and the second constant pressure tube 140 that are connected to the atmosphere are both bent, and this bending design can block the entry of moisture, dust and other foreign matter. Due to the existence of the bent portion 131, even if there is moisture or foreign matter in the external environment trying to invade the interior of the constant pressure tube, it will not be able to enter smoothly due to the obstruction of the bent portion 131. In this way, the interior of the constant pressure tube can always be kept clean and dry, thereby avoiding the problem of performance degradation caused by clogging or corrosion by foreign matter.

[0046] In addition, since the setting of the curved portion 131 does not affect the normal communication between the constant pressure tube and the atmosphere, the air pressure balance mechanism of the device can still operate smoothly.

[0047] In some specific embodiments, the dryer 200 is filled with anhydrous calcium chloride, which has a high hygroscopic performance. This hygroscopic performance is mainly based on two adsorption mechanisms: physical adsorption and chemical adsorption.

[0048] First of all, physical adsorption refers to the ability of the polar molecular structure of anhydrous calcium chloride to interact with water molecules. The Cl ions in anhydrous calcium chloride molecules are highly hydrophilic, and electrostatic forces will occur between them and water molecules, adsorbing water molecules on the surface of calcium chloride particles.

[0049] Secondly, chemical adsorption is the main mechanism of drying of anhydrous calcium chloride. In this process, the Ca in the anhydrous calcium chloride molecule 2+ Ions and hydroxyl groups (OH - ) reacts chemically to form a hydrate CaCl2·nH2O. This chemical reaction is irreversible. Once it occurs, water molecules are bound to the hydrate and cannot be released. This chemical adsorption mechanism allows anhydrous calcium chloride to absorb more water.

[0050] When xylene flows through the dryer 200 filled with anhydrous calcium chloride, the water in the xylene is quickly absorbed by the anhydrous calcium chloride, thereby achieving efficient drying of the xylene. This design not only improves the dehydration efficiency of xylene, but also ensures that the quality of the dehydrated xylene meets the relevant standards.

[0051] Of course, in actual applications, different process conditions and raw material characteristics may have different requirements for the structure and filler of the dryer 200. Therefore, in other embodiments of the present invention, it is not limited to the choice of anhydrous calcium chloride. On the contrary, the structure and filler of the dryer 200 are designed and adjusted according to specific application scenarios and requirements.

[0052] For example, in some embodiments, molecular sieves can be used as fillers for the dryer 200. Molecular sieves have higher selectivity and adsorption capacity, and can more effectively remove trace moisture and impurities in xylene. In other embodiments, the internal structure of the dryer 200 is optimized, such as adding multiple drying layers or changing the arrangement of the drying layers, to improve the drying effect and ease of operation.

[0053] In some specific embodiments, the separator 100 and the dryer 200 are both provided with a sewage outlet 160 at the bottom to facilitate regular discharge of impurities in the separator 100 and the dryer 200 .

[0054] In some specific embodiments, a flow rate pump 112 is installed on the liquid inlet pipe 111 to achieve accurate control of the xylene delivery flow rate. The flow rate pump 112, as a commonly used flow control device, has the characteristics of a wide adjustment range and high control accuracy. When xylene enters the device through the liquid inlet pipe 111, the flow rate pump 112 can adjust the flow rate of xylene according to preset parameters or actual needs. In this way, whether in the device startup stage, stable operation stage or shutdown stage, it can be ensured that xylene enters the separator 100 at a suitable flow rate, thereby avoiding problems such as liquid level fluctuations caused by too fast flow rate or low dehydration efficiency caused by too slow flow rate.

[0055] The embodiment of the utility model also provides a xylene dehydration process method, which is applied to the above-mentioned xylene dehydration device, and the specific operation process is as follows:

[0056] Check whether the xylene drying device is clean and there is no leakage in the pipeline to confirm that it can operate normally.

[0057] 500 kg of solid calcium chloride is dispersed and laid in the dryer 200 .

[0058] Pure water of 2000 kg is injected into the separator 100 , and it is confirmed that the connecting valves among the separator 100 , the dryer 200 , and the temporary storage tank 300 are in an open state.

[0059] A diaphragm pump is used to slowly pump the xylene evaporated from the reactor receiving tank into the separator 100. The xylene entering the separator 100 automatically overflows into the dryer 200. The dried xylene overflows into the temporary storage tank 300. The separator 100 is connected to the ground ton barrel through the drain pipe 130 to receive the water overflowing from the separator 100.

[0060] When the liquid in the temporary storage tank 300 reaches a certain level, the xylene is squeezed out to the corresponding ton barrel for temporary storage and marked as dried xylene. Then sampling and testing are carried out, and qualified products are temporarily stored, while unqualified products are subjected to secondary drying.

[0061] The moisture content in xylene was tested using a moisture meter and the result was 0.03%.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A xylene dehydration device for dehydrating and drying xylene, characterized in that: include: A separator (100), wherein the separator (100) is filled with pure water, and the separator (100) has a first liquid inlet (110) and an overflow port (120), wherein the first liquid inlet (110) is in communication with a liquid inlet pipe (111), and xylene to be dehydrated and dried can be transported into the separator (100) through the liquid inlet pipe (111); A dryer (200), the dryer (200) comprising a second liquid inlet (210) and a first liquid outlet (220), the second liquid inlet (210) being located at the lower side of the dryer (200), the first liquid outlet (220) being located at the upper side of the dryer (200), and the second liquid inlet (210) being connected to the overflow outlet (120) via an overflow pipe (211); A temporary storage tank (300), wherein a third liquid inlet (310) is provided on the upper side of the temporary storage tank (300), a second liquid outlet (320) is provided on the lower side of the temporary storage tank (300), and the third liquid inlet (310) is connected to the first liquid outlet (220) via a liquid infusion tube (311); and a liquid level meter (330) is provided on the side wall of the temporary storage tank (300).

2. The xylene dehydration device according to claim 1, characterized in that: The temporary storage tank (300) is provided with a first constant pressure pipe (340), one end of the first constant pressure pipe (340) is connected to the upper end of the temporary storage tank (300), and the other end of the first constant pressure pipe (340) is connected to the upper end of the dryer (200); the upper end of the temporary storage tank (300) is connected to a first external pipe (350), and the temporary storage tank (300) is connected to the outside atmosphere through the first external pipe (350).

3. The xylene dehydration device according to claim 2, characterized in that: The bottom of the separator (100) is connected to a drainage pipe (130).

4. The xylene dehydration device according to claim 3, characterized in that: The drain pipe (130) has a curved portion (131), and the highest point of the curved portion (131) is lower than the setting position of the overflow port (120).

5. The xylene dehydration device according to claim 4, characterized in that: The drain pipe (130) and the liquid inlet pipe (111) are both connected to a second constant pressure pipe (140), and the end of the second constant pressure pipe (140) facing away from the drain pipe (130) is connected to the top of the separator (100); the upper end of the separator (100) is connected to a second external pipe (150), and the separator (100) is connected to the outside atmosphere through the second external pipe (150).

6. The xylene dehydration device according to claim 5, characterized in that: The ends of the first constant pressure tube (340) and the second constant pressure tube (140) that are connected to the atmosphere are both bent.

7. The xylene dehydration device according to claim 1, characterized in that: The dryer (200) is filled with anhydrous calcium chloride.

8. The xylene dehydration device according to any one of claims 1 to 7, characterized in that: The bottoms of the separator (100) and the dryer (200) are both provided with sewage outlets (160).

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