Waste solvent recovery device

Abstract

The utility model relates to the technical field of waste solvent recovery, in particular to a waste solvent recovery device which comprises a stock solution tank, a rough filtration device, a fine filtration device, a clear liquid tank, a concentrated liquid tank and a deposition tank, the stock solution tank is connected with the rough filtration device through a feeding pump, the rough filtration device is connected with the fine filtration device through a booster pump and a circulating pump, and the clear liquid tank is connected with the concentrated liquid tank through a circulating pump. The fine filtration device is respectively connected with the clear liquid tank and the concentrated liquid tank, so that micromolecular components after fine filtration enter the clear liquid tank and macromolecular components enter the concentrated liquid tank, and the deposition tank is respectively connected with the concentrated liquid tank and the stock solution tank, so that supernatant after precipitation returns to the stock solution tank again for recovery. According to the automatic pumping and filtering system, the high efficiency and continuity of the treatment process are ensured; the recycling of the clean solvent reduces the generation of wastes and saves resources; the concentration purity of the waste solvent can be improved through multiple times of circulating filtration, so that the waste solvent is more suitable for follow-up treatment or reutilization.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste solvent recovery technical field, especially in kind of waste solvent recovery device. BACKGROUND

[0002] Waste solvent usually refers to the solvent that has been used, lost effect, or some solvents that are not completely reacted in chemical reaction. Waste solvent is volatile, if not handled properly, it is easy to volatilize into the atmosphere, become volatile organic compounds (VOCs), and then harm human health through inhalation; waste solvent seeps into the ground will pollute the soil and water, cause long-term impact on the ecological environment; waste solvent often contains halogenated hydrocarbons, polycyclic aromatic hydrocarbons and heavy metals and other toxic and harmful substances, these substances can enter the human body through the digestive tract, respiratory tract or skin, pose a threat to human health. Therefore, waste solvent needs to be recovered and treated, at present, the recovery of waste solvent mainly has the following methods distillation method, extraction method, adsorption method, condensation method and membrane separation method, among them, membrane separation method has high separation efficiency, wide application range, especially suitable for the recovery of toxic waste solvent.

[0003] Chinese patent publication No. CN212915189U discloses a solvent type paint cleaning waste solvent recovery device, which comprises a raw material tank, the raw material tank is connected with a precision filter through a first pipeline, the precision filter is provided with an ultrafiltrate tank away from the raw material tank, the ultrafiltrate tank and the raw material tank are connected through a second pipeline, the input end of a circulating pump is connected with the ultrafiltrate tank through a third pipeline, the output end of the circulating pump is connected with a clear liquid tank through a fourth pipeline, the ultrafiltrate tank and the clear liquid tank are connected through a fifth pipeline, the utility model adopts ceramic ultrafiltration for filtering treatment, removes solid impurities, uses solvent-resistant nanofiltration membrane to perform liquid concentration treatment on molecular substances with molecular weight higher than 200, extracts small molecule solvents, so as to extract valuable cleaning solvent components from waste.

[0004] The above patent only recovers small molecule solvents, and the filtered large molecule components are not further disposed. UTILITY MODEL CONTENTS

[0005] The utility model solves the problem in the related art, proposes a kind of waste solvent recovery device, is introduced into coarse filter device by pump body automatically, filters large particle paint slag in waste solvent, completes coarse filtration, and the filtrate after coarse filtration is introduced into precision filter device by booster pump and circulating pump and is filtered, removes macromolecular component in waste solvent, remaining small molecule component enters clear liquid tank body as clean solvent and is used for robot cleaning purpose, macromolecular component is recycled and is fed back to raw liquid tank and is filtered again with waste solvent, further improve concentration purity, finally enter thick liquid tank and wait for hazardous waste treatment.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: a waste solvent recovery device, including a raw liquid tank, a coarse filtration device, a fine filtration device, a clear liquid tank, a concentrated liquid tank, and a sedimentation tank. The raw liquid tank is connected to the coarse filtration device through a feed pump. The coarse filtration device is connected to the fine filtration device through a booster pump and a circulation pump. The fine filtration device is connected to both the clear liquid tank and the concentrated liquid tank, so that the small molecule components after fine filtration enter the clear liquid tank and the large molecule components enter the concentrated liquid tank. The sedimentation tank is connected to both the concentrated liquid tank and the raw liquid tank, so that the supernatant after sedimentation is returned to the raw liquid tank for recovery.

[0007] As a preferred embodiment, the coarse filtration device employs a precision filter.

[0008] As a preferred embodiment, the fine filtration device uses an RO membrane.

[0009] As a preferred embodiment, the fine filtration device is also connected to a cleaning tank.

[0010] As a preferred embodiment, the raw material tank is connected to the waste solvent tank via a filter.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model ensures the high efficiency and continuity of the processing through an automated pumping and filtration system; the reuse of clean solvents reduces waste generation and saves resources; multiple cyclic filtrations help improve the concentration and purity of waste solvents, making them more suitable for subsequent processing or reuse; pre-filtration of waste solvents before they enter the stock solution tank can effectively reduce the burden on filters during subsequent processing, which not only extends the service life of subsequent filters but also improves the efficiency of the entire processing flow. This is because if there are too many impurities in the waste solvent, subsequent filters may need to be cleaned or replaced more frequently, which increases operating costs and time. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] In the picture:

[0014] 1. Raw material tank; 2. Coarse filter; 3. Fine filter; 4. Clarified liquid tank; 5. Concentrated liquid tank; 6. Sedimentation tank; 7. Feed pump; 8. Booster pump; 9. Circulation pump; 10. Washing tank; 11. Waste solvent tank; 12. Filter. Detailed Implementation

[0015] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0016] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0017] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0018] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0019] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0020] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0021] like Figure 1 As shown, a waste solvent recovery device includes a raw liquid tank 1, a coarse filter device 2, a fine filter device 3, a clear liquid tank 4, a concentrated liquid tank 5, and a sedimentation tank 6. The raw liquid tank 1 is connected to the coarse filter device 2 via a feed pump 7. The coarse filter device 2 is connected to the fine filter device 3 via a booster pump 8 and a circulation pump 9. The fine filter device 3 is connected to both the clear liquid tank 4 and the concentrated liquid tank 5, so that the small molecule components after fine filtration enter the clear liquid tank 4 and the large molecule components enter the concentrated liquid tank 5. The sedimentation tank 6 is connected to both the concentrated liquid tank 5 and the raw liquid tank 1, so that the supernatant after sedimentation is returned to the raw liquid tank 1 for recovery.

[0022] In one embodiment, the coarse filtration device 2 employs a precision filter to filter large particles of paint residue from the waste solvent.

[0023] In one embodiment, the fine filtration device 3 uses an RO membrane to remove macromolecular components from the waste solvent.

[0024] In one embodiment, the fine filtration device 3 is also connected to the cleaning tank 10 so as to periodically clean the RO membrane with a cleaning agent.

[0025] In one embodiment, the stock solution tank 1 is connected to the waste solvent tank 11 via a filter 12. The waste solvent tank 11 is equipped with a diaphragm pump, so the waste solvent from the waste solvent tank 11 enters the filter 12 through the diaphragm pump for the first filtration before entering the stock solution tank 1 for storage.

[0026] In addition, flow meters, level gauges, temperature and pressure sensors can be installed on the pipelines between the tanks for real-time monitoring as needed.

[0027] The waste solvent treatment process is as follows:

[0028] The waste solvent in waste solvent tank 11 is first pre-filtered by filter 12 and then enters raw liquid tank 1. The waste solvent in raw liquid tank 1 is automatically introduced into coarse filtration device 2 by feed pump 7 to remove large particles of paint residue and other impurities from the waste solvent. The filtrate after coarse filtration is introduced into fine filtration device 3 by booster pump 8 and circulation pump 9. In fine filtration device 3, the waste solvent undergoes finer filtration, and large molecular components are retained. The remaining small molecular components are used as clean solvent and enter clear liquid tank 4 for cleaning, ensuring the reuse of solvent and reducing waste generation. The large molecular components retained by fine filtration device 3 enter concentrated liquid tank 5 and are deposited in sedimentation tank 6. The supernatant is then circulated back to raw liquid tank 1, where it is mixed with the waste solvent and filtered again to improve the concentration purity. After multiple cycles of filtration, the concentrated large molecular components in the waste solvent finally enter concentrated liquid tank 5 for hazardous waste treatment to ensure compliance with environmental protection requirements.

[0029] The above are preferred embodiments of this utility model. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on this utility model shall fall within the protection scope of this utility model.

Claims

1. A waste solvent recovery apparatus, characterized by: It comprises a raw liquid tank (1), a rough filter device (2), a fine filter device (3), a clear liquid tank (4), a thick liquid tank (5) and a sedimentation tank (6), the raw liquid tank (1) is connected with the rough filter device (2) through a feeding pump (7), the rough filter device (2) is connected with the fine filter device (3) through a booster pump (8) and a circulating pump (9), the fine filter device (3) is connected with the clear liquid tank (4) and the thick liquid tank (5) respectively, so that the small molecular components after fine filtering enter the clear liquid tank (4) and the large molecular components enter the thick liquid tank (5), the sedimentation tank (6) is connected with the thick liquid tank (5) and the raw liquid tank (1) respectively, so that the supernatant after precipitation returns to the raw liquid tank (1) for recycling.

2. The waste solvent recovery apparatus according to claim 1, characterized by: The rough filter device (2) adopts a precision filter.

3. The waste solvent recovery apparatus according to claim 1, characterized by: The fine filter device (3) adopts an RO membrane.

4. The waste solvent recovery apparatus according to claim 1, characterized by: The fine filter device (3) is also connected with a cleaning tank (10).

5. The waste solvent recovery apparatus according to claim 1, characterized by: The raw liquid tank (1) is connected with a waste solvent tank (11) through a filter (12).

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