A device for removing water and floating substances from a dichloromethane mixture

Abstract

The utility model relates to chemical separation treatment equipment technical field, concretely for a kind of water removal and floating object device for dichloromethane mixed solution, comprising: suction unit and floating suction head unit;The suction unit includes diaphragm pump and filter connected by steel hose in turn;The floating suction head unit is connected with the inlet of the diaphragm pump by the steel hose, the diaphragm pump is connected to filter inlet by stainless steel pipe, and the outlet of filter is connected to a gas tank;The floating suction head unit includes: float, the float is hollow sealed structure;Balance bar, the balance bar is fixedly connected to the bottom center of the float, and extends downward along vertical direction;Counterweight, the counterweight is arranged on the balance bar;Suction inlet, the suction inlet is arranged on the peripheral sidewall of the float, and all suction inlets are located at the same level height, and the suction inlet is communicated with the steel hose by pipeline.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical separation and treatment equipment, specifically a device for removing water and floating matter from a dichloromethane mixture. Background Technology

[0002] In the chemical production field, dichloromethane, as a commonly used organic solvent, often forms a mixture with water and a small amount of insoluble substances such as polyethylene (PE) powder. Because dichloromethane is denser than water and highly volatile, its separation from water and PE powder is a critical step in the production process. Inaccurate separation not only leads to the loss of dichloromethane but also generates VOCs (volatile organic compounds) through volatilization, posing health and safety hazards and causing environmental pollution.

[0003] Currently, the industry primarily employs the traditional process of "static stratification + fixed pipette suction" for separating such mixtures: the mixture is first allowed to stand, utilizing density differences to form a water phase on top and a dichloromethane phase on the bottom; then, the water phase is extracted using a pipette fixed within the container. However, this process suffers from insurmountable technical drawbacks in practical applications, specifically as follows:

[0004] Poor separation accuracy can easily lead to material loss or incomplete water removal. The suction position of the fixed suction tube cannot adaptively adjust to changes in the liquid level: if the suction tube is set too deep, it will draw in lower-layer dichloromethane before the water layer is completely removed, resulting in the loss of organic phase materials and increasing the pollutant content in subsequent water treatment stages; if the suction tube is set too shallow, a large amount of upper-layer water will remain, requiring manual secondary suction, which not only increases operating costs but may also damage the separation interface, further reducing the separation effect. In actual production, workers need to continuously monitor the liquid level and manually adjust the suction tube position, which is cumbersome and prone to misjudgment leading to separation accuracy deviations. Therefore, we provide a water and floating matter removal device for dichloromethane mixtures. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a device for removing water and floating matter from a dichloromethane mixture.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A device for removing water and floating matter from a dichloromethane mixture includes a suction unit and a floating suction head unit; the suction unit includes a diaphragm pump and a filter connected in sequence via a steel wire hose.

[0008] The floating suction head unit is connected to the inlet of the diaphragm pump via the steel wire hose. The diaphragm pump is connected to the filter inlet via a stainless steel pipe. The filter outlet is connected to an aeration tank.

[0009] The floating suction head unit includes: a float, which is a hollow sealed structure; a balance bar, which is fixedly connected to the bottom center of the float and extends downward in a vertical direction; a counterweight, which is disposed on the balance bar; and suction ports, which are disposed on the four side walls of the float, and all suction ports are located at the same horizontal height, and the suction ports are connected to the steel wire hose through pipes.

[0010] Furthermore, the structure of the float can be any one of a disc shape, a hemispherical shape, or a cylindrical shape.

[0011] Furthermore, the intake ports are evenly distributed along the circumference of the float, and there are multiple intake ports.

[0012] Furthermore, the bottom of the balance bar is tapered, or a buffer pad is provided at the bottom of the balance bar to prevent hard collisions between the balance bar and the bottom of the container.

[0013] Furthermore, the bottom of the balance bar is a bolt structure, which enables the installation and position adjustment of the counterweight.

[0014] Furthermore, the filter is equipped with a replaceable filter bag or filter element to trap PE powder floating matter in the mixture.

[0015] Furthermore, the diaphragm pump is a pneumatic diaphragm pump or an electric diaphragm pump.

[0016] Furthermore, the float is made of stainless steel and has a completely sealed hollow structure to ensure stable buoyancy.

[0017] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows:

[0018] Fixed connection: refers to a connection in which parts or components are fixed in place and there is no relative movement. It is divided into two types: detachable connection and non-detachable connection.

[0019] (1) Detachable connection: The components are fixed together using screws, splines, wedges, etc. This type of connection can be disassembled during maintenance without damaging the parts. However, the specifications of the connecting parts used must be correct (such as the length of the bolts, keys, wedges) and properly tightened.

[0020] (2) Non-removable connections: These mainly refer to welding, riveting, and tenon joints. Since disassembly requires forging, sawing, or oxyacetylene cutting for repair or replacement, the parts generally cannot be reused. At the same time, attention should be paid to process quality, technical inspection, and remedial measures (such as correction and polishing) during connection.

[0021] The beneficial effects of this invention are:

[0022] 1. This device utilizes the dynamic balance principle of "buoyancy of a hollow float + gravity of an adjustable counterweight." By adjusting the position of the counterweight, the suction inlet is stably suspended 5-10mm below the surface of the mixed liquid, automatically tracking changes in the liquid level: During suction, as the water layer decreases and the liquid level drops, the buoyancy of the device decreases in the dichloromethane layer because dichloromethane is denser than water, causing the suction inlet to rise accordingly; when the water layer is almost completely drained, the suction inlet automatically emerges from the surface of the remaining water layer, and pumping is interrupted after air enters, achieving "stop when water is exhausted." The entire process requires no sensors, electrical control systems, or other precision components, relying entirely on the mechanical structure for autonomous operation, resulting in extremely high reliability and solving the problems of traditional fixed suction pipes that "require manual monitoring of start / stop and are prone to misoperation."

[0023] 2. When the device stops pumping, a thin layer of water will remain on the surface of the dichloromethane, forming a "water seal layer". On the one hand, it can isolate the air and prevent the direct exposure of dichloromethane (a volatile organic solvent), greatly reducing VOCs (volatile organic compounds) emissions and reducing the risk of personnel inhalation and safety hazards. On the other hand, it can prevent material loss caused by the volatilization of dichloromethane. Compared with the defects of traditional methods where "dichloromethane is easy to volatilize after the water layer is pumped out", it effectively ensures material utilization and production safety.

[0024] 3. The suction inlets are evenly distributed around the circumference of the float and at the same horizontal height, which can cover the liquid surface 360° and efficiently extract the upper water phase. At the same time, light floating objects such as PE powder accumulate at the interface between water and dichloromethane and can be sucked in with the upper water, avoiding the residue of floating objects. The filter in the suction unit (equipped with a replaceable filter bag or filter element) can further trap PE powder, ensuring that the water discharged to the aeration tank is free of solid impurities, realizing the complete separation of the three phases of "water-dichloromethane-PE powder", and solving the problem of "difficulty in handling interface floating objects and incomplete separation" of traditional fixed suction tubes. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall system connection of the device described in this utility model.

[0027] In the diagram: 1. Floating suction head unit; 2. Steel wire hose; 3. Diaphragm pump; 4. Filter; 5. Aeration tank; 6. Storage tank; 7. Water layer; 8. Dichloromethane layer; 9. PE powder floating matter; 11. Float; 12. Balance bar; 13. Counterweight; 14. Suction port. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] A device for removing water and floating matter from a dichloromethane mixture, such as... Figure 1 As shown, it includes a suction unit and a floating suction head unit 1; the suction unit includes a diaphragm pump 3 and a filter 4 connected in sequence through a steel wire hose 2;

[0030] The floating suction head unit 1 is connected to the inlet of the diaphragm pump 3 through the steel wire hose 2. The diaphragm pump 3 is connected to the inlet of the filter 4 through a stainless steel pipe. The outlet of the filter 4 is connected to an aeration tank 5.

[0031] The floating suction head unit 1 includes: a float 11, which is a hollow sealed structure; a balance bar 12, which is fixedly connected to the bottom center of the float 11 and extends downward in the vertical direction; a counterweight 13, which is disposed on the balance bar 12; and a suction port 14, which is disposed on the four side walls of the float 11, and all suction ports 14 are located at the same horizontal height, and the suction ports 14 are connected to the steel wire hose 2 through pipes.

[0032] This device, through the combination of a hollow sealed float 11 and an adjustable counterweight 13, can keep the suction port 14 stably suspended at a specific depth (5-10mm) below the surface of the mixed liquid by adjusting the position of the counterweight 13. This allows for precise suction of the upper water phase and floating PE powder 9. At the same time, taking advantage of the fact that dichloromethane has a higher density than water, the device will adaptively float upward as the water level drops. When the water layer 7 is about to be completely pumped out, the suction port 14 will automatically emerge from the liquid surface and stop pumping. This avoids product loss caused by "premature pumping leading to the extraction of dichloromethane" and also avoids the problem of "incomplete water removal caused by stopping too late," thus solving the defect of poor accuracy of traditional fixed suction tubes. The suction port 14 is positioned at the same horizontal level along the four sides of the float 11, covering the entire liquid surface. This allows for efficient extraction of lightweight floating matter such as PE powder accumulated at the interface between water and dichloromethane. Combined with the filter 4 in the suction unit, it further traps floating matter. Compared to the traditional fixed suction tube's difficulty in handling interface floating matter, this device achieves simultaneous separation of water and floating matter, improving the cleanliness of the mixed liquid. When suction stops, a thin layer of water remains on the dichloromethane surface, forming a "water seal layer." This effectively isolates the air, preventing direct exposure of dichloromethane (a volatile organic solvent) and VOCs volatilization. This reduces health and safety hazards (such as the risk of inhalation) and minimizes material volatilization loss, solving the problem of easy volatilization of dichloromethane after the water layer 7 is completely removed, a common issue in traditional methods.

[0033] As a preferred embodiment of this utility model, the structure of the float 11 is any one of a disc shape, a hemispherical shape, or a cylindrical shape. Disc, hemispherical, and cylindrical shapes are all regular symmetrical structures, which ensure that the center of buoyancy (point of buoyancy) of the float 11 and the overall center of gravity (the resultant force point of the float 11 + balance bar 12 + counterweight 13) remain on the same vertical line. This prevents the float 11 from tilting or overturning due to structural asymmetry, ensuring that all intake ports 14 are always at the same horizontal height. This prevents some intake ports 14 from being too deep (inhaling lower layer dichloromethane) or too shallow (unable to effectively pump out upper layer water and floating objects) due to the float 11's tilt, thus meeting the core requirement of "precise separation of water and dichloromethane".

[0034] In a preferred embodiment of this invention, the suction ports 14 are evenly distributed circumferentially along the float 11, and there are multiple suction ports 14. The mixture contains an upper water layer 7 plus floating PE powder 9, and the PE powder easily accumulates at the interface between water and dichloromethane. Traditional fixed suction tubes, due to their limited suction range, are prone to leaving water or floating debris in localized areas. However, the "multiple evenly distributed suction ports 14" can form a ring-shaped suction area around the float 11, covering the entire liquid surface (rather than a single direction or localized point), simultaneously extracting the upper water and floating PE powder 9 within a 360° range around the float 11, avoiding "partial water not being completely extracted" or "PE powder accumulating in uncovered areas" due to suction blind spots.

[0035] As a preferred embodiment of this utility model, the bottom of the balance bar 12 is a conical structure, or a buffer pad is provided at the bottom of the balance bar 12 to prevent the balance bar 12 from having a hard collision with the bottom of the container.

[0036] As a preferred embodiment of this utility model, the bottom of the balance bar 12 is a bolt structure, which enables the installation and position adjustment of the counterweight 13.

[0037] As a preferred embodiment of this utility model, the filter 4 is provided with a filter bag or filter element that is easy to replace, for intercepting PE powder floating matter 9 in the mixture.

[0038] As a preferred embodiment of this utility model, the diaphragm pump 3 is a pneumatic diaphragm pump 3 or an electric diaphragm pump 3.

[0039] As a preferred embodiment of this utility model, the float 11 is made of stainless steel and has a completely sealed hollow structure to ensure stable buoyancy.

[0040] Working principle and usage process of this utility model:

[0041] The device of this invention includes a floating suction head unit 1, a steel wire hose 2, a diaphragm pump 3, a filter 4, and an aeration tank 5. In use, the floating suction head unit 1 is placed in a storage tank 6 containing a mixed liquid. After the mixed liquid settles and separates into layers, the upper layer is a water layer 7 and floating PE powder 9, and the lower layer is a dichloromethane layer 8. The float 11 is a hollow stainless steel disc that provides the main buoyancy. A balance bar 12 is welded to the center of the bottom of the float 11. By moving the counterweight 13 (such as a stainless steel block) up and down on the balance bar 12, the draft of the entire suction head unit can be precisely adjusted to ensure that the suction ports 14 around it are submerged approximately 8 mm below the liquid surface. The pneumatic or electric diaphragm pump 3 is started, and the liquid on the surface of the mixed liquid is drawn through the suction ports 14. The liquid flows sequentially through the steel wire hose 2, the diaphragm pump 3, and into the filter 4. The filter 4 uses replaceable filter bags or filter cartridges to trap the PE powder in the water. The clean water, after removing solid impurities, is discharged into the aeration tank 5 for further treatment.

[0042] As suction proceeds, the total liquid level in storage tank 6 decreases. As the water layer 7 thins, the liquid in contact with the bottom of the floating suction head unit 1 gradually becomes denser dichloromethane, which reduces buoyancy, causing the unit to sink slightly, but its absolute height relative to the liquid surface increases (i.e., the draft becomes shallower). Finally, when only a very thin layer of water layer 7 remains, the suction port 14 rises to just above the water surface, air is drawn in, the pumped fluid is interrupted, and the suction process automatically stops. At this point, sufficient dichloromethane remains at the bottom of the tank, and its surface is covered by a thin layer of water, achieving a seal.

[0043] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A device for removing water and floating matter from a dichloromethane mixture, characterized in that, It includes a suction unit and a floating suction head unit (1); the suction unit includes a diaphragm pump (3) and a filter (4) connected in sequence through a steel wire hose (2); The floating suction head unit (1) is connected to the inlet of the diaphragm pump (3) through the steel wire hose (2), the diaphragm pump (3) is connected to the inlet of the filter (4) through the stainless steel pipe (10), and the outlet of the filter (4) is connected to an aeration tank (5). The floating suction head unit (1) includes: a float (11), which is a hollow sealed structure; a balance bar (12), which is fixedly connected to the bottom center of the float (11) and extends downward in the vertical direction; a counterweight (13), which is disposed on the balance bar (12); and a suction port (14), which is disposed on the four sides of the float (11), and all suction ports (14) are located at the same horizontal height, and the suction ports (14) are connected to the steel wire hose (2) through a pipe.

2. The device for removing water and floating matter from a dichloromethane mixture according to claim 1, characterized in that, The structure of the float (11) can be any one of a disc shape, a hemispherical shape, or a cylindrical shape.

3. The device for removing water and floating matter from a dichloromethane mixture according to claim 1, characterized in that, The inlet (14) is evenly distributed along the circumference of the float (11), and there are multiple inlet (14).

4. The device for removing water and floating matter from a dichloromethane mixture according to claim 1, characterized in that, The bottom of the balance bar (12) is tapered, or a buffer pad is provided at the bottom of the balance bar (12) to prevent the balance bar (12) from having a hard collision with the bottom of the container.

5. The device for removing water and floating matter from a dichloromethane mixture according to claim 1, characterized in that, The bottom of the balance bar (12) is a bolt structure, through which the counterweight (13) is installed and its position is adjusted.

6. The device for removing water and floating matter from a dichloromethane mixture according to claim 1, characterized in that, The filter (4) is equipped with a filter bag or filter element that is easy to replace, which is used to intercept PE powder floating matter in the mixture.

7. The device for removing water and floating matter from a dichloromethane mixture according to claim 1, characterized in that, The diaphragm pump (3) is a pneumatic diaphragm pump or an electric diaphragm pump.

8. The device for removing water and floating matter from a dichloromethane mixture according to claim 1, characterized in that, The float (11) is made of stainless steel and is a completely sealed hollow structure to ensure stable buoyancy.

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