KR102580889B1 - Organic solvent recovery apparatus - Google Patents

Abstract

The present invention relates to an organic solvent recovery device including: a discharge pipe that discharges mixed gas including an organic solvent whose boiling point exceeds 100 deg. C at 1 atm; a scrubber that sprays washing water into the mixed gas supplied from the discharge pipe; a distillation tower for separating the washing water and the organic solvent by distilling a mixture of the organic solvent and the washing water supplied from one area of the bottom of the scrubber; and a storage tank for separately storing the concentrated organic solvent and washing water separated from the distillation tower.

Description

Organic solvent recovery apparatus}

The present invention is an organic solvent recovery device, and more specifically, an organic solvent recovery device that recovers organic solvents using washing water sprayed through a plurality of scrubbers.

Recently, environmental pollution caused by various wastes generated during industrialization is becoming more serious day by day. Accordingly, various waste treatment and pollution prevention technologies and policies are being proposed to respond to environmental pollution caused by waste.

Currently, in Korea, waste is treated by landfilling, incineration, and recycling. However, landfilling has the problem of needing to secure a landfill site, and incineration has the problem of generating air pollutants from exhaust gases. In particular, designated waste poses a bigger problem because it is incinerated at high temperatures rather than separated by type and treated.

In general, designated waste is recycled and the rest is incinerated. At this time, designated wastes are workplace wastes that can pollute the surrounding environment or cause harm to the human body, and include waste acids, waste alkalis, waste oil, waste organic solvents, waste synthetic polymer compounds, etc.

Among designated wastes, waste organic solvents are highly volatile and dangerous substances with a high probability of being absorbed into the human body through the respiratory tract. They have a slow incineration speed and have problems in that backflow and explosion phenomena may occur in the internal space of the incinerator. Accordingly, the need for recycling of waste organic materials is increasing.

On the other hand, NMP, which is one of the organic solvents with high solubility in water, is used, for example, in the manufacturing process of lithium ion secondary batteries, by applying a slurry in which particles such as electrode active materials are dispersed onto an electrode current collector and drying it to form an electrode. When forming, it is widely used as a dispersion medium for slurry. NMP is recovered when the slurry is dried, and the recovered NMP can be reused after purification. In the recovery of NMP, vaporized NMP is recovered by, for example, a water scrubber.

Therefore, the present invention is an organic solvent that can efficiently recover organic solvents through a plurality of scrubbers, and improves economics and efficiency by reprocessing and utilizing the washing water used in recovering organic solvents. Providing a recovery device.

The present invention provides an organic solvent recovery device, comprising: a discharge pipe for discharging a mixed gas containing an organic solvent whose boiling point exceeds 100°C at 1 atm; a scrubber that sprays cleaning water into the mixed gas supplied from the discharge pipe; a distillation tower for separating the washing water and the organic solvent by distilling a mixture of the organic solvent and the washing water supplied from a lower area of the scrubber; and a storage tank for separately storing the concentrated organic solvent and washing water separated from the distillation tower.

The scrubber may be composed of a plurality of scrubbers, and the plurality of scrubbers include a first scrubber and a second scrubber to which the mixed gas that has passed through the first scrubber is supplied, and is supplied to the distillation column from the first scrubber. The concentration of the first mixture is higher than the concentration of the second mixture supplied from the second scrubber to the distillation tower, and further includes a plurality of sensors and a server connected to the plurality of sensors in a network, among the plurality of sensors. The first sensor detects the discharge pressure of the mixed gas discharged from the discharge pipe, and the second sensor detects the inflow amount of the concentrated organic solvent flowing into the storage tank, and includes a server networked with the plurality of sensors. If the discharge pressure detected by the first sensor is greater than or equal to the first standard among a plurality of preset standards, the server increases the spray amount of washing water from the plurality of scrubbers, and increases the spray amount of washing water from the plurality of scrubbers according to the first standard among the plurality of standards. If it is below the lower second standard, stop supplying the mixed gas discharged from the discharge pipe and spraying the washing water, and if it exceeds the second standard, stop supplying the mixed gas discharged from the discharge pipe and spraying the washing water. If the inflow amount of organic solvent detected by the second sensor is less than the third standard among the plurality of standards, the server increases the spray amount of washing water from the plurality of scrubbers, and the mixture discharged from the discharge pipe It is characterized by controlling to increase the supply amount of gas.

The scrubber includes a spray member through which cleaning water is sprayed, and the spray member

It includes a housing including a through groove provided inside to allow cleaning water to pass through; and a spray cap coupled to one area of the housing to spray cleaning water, wherein the spray cap includes a plurality of upper spray ports and a lower spray port. The plurality of upper injection openings include a first injection opening and a second injection opening 225, wherein the first injection opening has a first inclination angle of 20 to 30 degrees upward in a direction parallel to the ground, and the second injection opening 225 is It is longer than the first injection port and has a second inclination angle of 20 to 30 degrees upward from the first inclination angle in a direction parallel to the ground, and the first and second injection ports 225 are each passages through which washing water flows. It includes a first inner pipe and a second inner pipe, wherein the diameter of one region of the second inner pipe is larger than the diameter of one region of the first inner pipe, and washing water is sprayed from each of the first inner pipe and the second inner pipe. The diameter of one side is characterized in that the size is the same.

According to the present invention, it is possible to efficiently recover organic solvents through a plurality of scrubbers, and to provide an organic solvent recovery device that improves economics and efficiency by reprocessing and utilizing the washing water used to recover the organic solvents. .

Figure 1 is a diagram showing the configuration of an organic container recovery device according to an embodiment of the present invention.
Figure 2 is a diagram showing the configuration of a scrubber according to an embodiment of the present invention.
Figure 3 is an operation diagram showing the operation of a server controlling an organic container recovery device according to an embodiment of the present invention.
Figure 4 is a diagram showing the configuration of an injection member according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numbers or symbols refer to components that perform substantially the same function, and the size of each component in the drawings may be exaggerated for clarity and convenience of explanation. However, the technical idea of the present invention and its core configuration and operation are not limited to the configuration or operation described in the examples below. In describing the present invention, if it is determined that a detailed description of a known technology or configuration related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

In embodiments of the present invention, terms containing ordinal numbers, such as first, second, etc., are used only for the purpose of distinguishing one element from another element, and singular expressions are plural unless the context clearly indicates otherwise. Includes expressions of In addition, in embodiments of the present invention, terms such as 'consist', 'include', and 'have' refer to the presence of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Alternatively, it should be understood that the possibility of addition is not excluded in advance. Additionally, in an embodiment of the present invention, a 'module' or 'unit' performs at least one function or operation, may be implemented as hardware or software, or may be implemented as a combination of hardware and software, and may be integrated into at least one module. and can be implemented with at least one processor. Additionally, in an embodiment of the present invention, at least one of the plurality of elements refers to not only all of the plurality of elements, but also each one of the plurality of elements excluding the others or a combination thereof. Additionally, "configured to" may mean "suitable for," "having the capacity to," "~ It can be used interchangeably with “designed to,” “adapted to,” “made to,” or “capable of.” “Configured (or set to)” may not necessarily mean “specifically designed to” in terms of hardware. Instead, in some contexts, the expression “a device configured to” may mean that the device is “capable of” working with other devices or components. For example, the phrase "processor configured (or set) to perform A, B, and C" refers to a processor dedicated to performing the operations (e.g., an embedded processor), or by executing one or more software programs stored on a memory device. , may refer to a general-purpose processor (e.g., CPU or application processor) capable of performing the corresponding operations.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. This is intended to provide a detailed description so that a person skilled in the art can easily carry out the invention, and therefore does not limit the technical idea and scope of the present invention. .

Figure 1 is a diagram showing the configuration of an organic container recovery device according to an embodiment of the present invention.

Referring to FIG. 1, the organic container recovery device according to an embodiment of the present invention includes a discharge pipe 100, a plurality of scrubbers 200, a distillation tower 300, and a storage tank 400.

The discharge pipe 100 serves to discharge a mixed gas containing an organic solvent whose boiling point exceeds 100°C at 1 atm and supply it to the organic solvent recovery device. The discharge pipe 100 may be made of stainless steel to prevent corrosion by organic solvents, or may be made of a thermosetting plastic that is resistant to heat and a similar plastic material. Meanwhile, the organic solvent according to an embodiment of the present invention refers to a mixed gas of NMP (N-methyl-2-pyrrolidone) and water, and generally the boiling point at atmospheric pressure (0.1013 MPa) is the boiling point of water. The present invention can also be applied to organic solvents that are higher than (100°C) and preferably have a boiling point under atmospheric pressure of 120°C or higher, which is the general operating temperature of an organic solvent recovery device. Additionally, as an organic solvent to which the present invention can be applied, an organic solvent that does not form an azeotropic mixture with water is more preferable. As an example, organic solvents other than PGME, PEGMEA, and pyridine that do not form an azeotropic mixture with water may be applied.

Figure 2 is a diagram showing the configuration of a scrubber according to an embodiment of the present invention. Referring to FIG. 2, the scrubber sprays washing water on the organic solvent supplied from the discharge pipe 100 to wash it and simultaneously absorbs the organic solvent in the washing water to recover the organic solvent. A mixed gas containing organic solvents flows into the scrubber at the bottom, and washing water is sprayed through a nozzle at the top, so that the washing water circulates inside the scrubber so that the organic solvents are absorbed into the washing water, and the organic solvents that are not absorbed are mixed. It can be implemented to be discharged from the upper end of the scrubber in the form of gas. Meanwhile, the scrubber may include a spray member that allows the cleaning water to be sprayed uniformly. As in FIG. 2, the spray member is located at the top of the space within the scrubber and sprays washing water to the bottom. After a certain period of time, the washing water with the organic solvent absorbed is discharged from the lower side, and the organic solvent in the form of gas that was not absorbed is discharged from the bottom. can be discharged from the upper end.

The distillation tower 300 serves to separate the washing water and the organic solvent by receiving a mixed liquid of the organic solvent and washing water discharged from the lower part of the scrubber and distilling it. The distillation tower 300 includes a plurality of evaporators, which are stacked vertically and are designed so that the liquid condensed at each stage inside the distillation tower 300 flows downward by gravity, and the vaporized gas rises to the upper layer, so that each boiling point This can be implemented to separate other organic solvents and washing water. On the other hand, the distillation tower 300 according to an embodiment of the present invention is a batch-type distillation tower 300 that processes new raw materials when a certain amount of raw materials are input according to the process and their processing is completed, and raw materials are continuously introduced. It may include a continuous distillation column (300) that completes the treatment, and the tray within the distillation column (300) may include a bubble cap tray, a perforated plate tray, and a valve tray. Preferably, in the case of NMP, impurities are removed. Since this does not occur in large quantities, it can be implemented as a bubble cap tray that can be used universally.

The storage tank 400 refers to a facility that contains fluid and stores it in an internal space. The storage tank 400 according to an embodiment of the present invention stores a large amount of washing water and supplies it to the scrubber. Types of the storage tank 400 may include all types of storage tanks 400 with a space for storing a large amount of washing water, including fixed roof tanks, floating roof tanks, and circular storage tanks, preferably It may consist of a circular storage tank manufactured in a spherical shape to easily distribute internal pressure.

The scrubber according to an embodiment of the present invention may be composed of a plurality of scrubbers 200, and the plurality of scrubbers 200 are supplied with a first scrubber 210 and the mixed gas that has passed through the first scrubber 210. The concentration of the first mixture supplied to the distillation tower 300 from the first scrubber 210 is that of the second mixture supplied to the distillation tower 300 from the second scrubber 220. It can be configured to be higher than the concentration. This is because the concentration of the mixed solution supplied to the distillation tower 300 decreases as the organic solvent passing through the plurality of scrubbers 200 is sequentially absorbed into the washing water in each scrubber. Therefore, at this time, the concentration of the washing water supplied to the scrubber can be gradually lowered so that the concentration of the mixed solution supplied to the distillation tower 300 sequentially decreases. Therefore, in the conventional scrubber before the mixed gas is discharged to the outside, the washing water can be sprayed in the form of complete water. That is, the washing water may be configured to contain water, and an absorbent to better absorb the organic solvent may also be added. This explains that it can be implemented to gradually decrease through stages.

Figure 3 is an operation diagram showing the operation of a server controlling an organic container recovery device according to an embodiment of the present invention.

Referring to FIG. 3, an organic solvent recovery device according to an embodiment of the present invention includes a plurality of sensors and a server connected to the plurality of sensors in a network.

The server is network-connected to the organic solvent recovery device, can store various data, and can control detailed operations of the organic solvent recovery device through programs or applications. At this time, the control program of the server may include program(s) implemented in the form of at least one of BIOS, device driver, operating system, firmware, platform, and application program. As an embodiment, the application program may be pre-installed or stored on a server provided at the time of manufacturing the server, or may receive application data from an external source during future use and be installed on the server based on the received data. . Application data may be downloaded from an external server such as an application market, for example, but is not limited to this. Meanwhile, the control program may be implemented in the form of devices, S/W modules, circuits, chips, etc., or a combination thereof.

The server can communicate with other external electronic devices through wired and wireless communication, and therefore can be implemented with various other communication methods in addition to a connection unit including a connector or terminal for wired connection. For example, it may be configured to perform one or more communications among Wi-Fi, Bluetooth, Zigbee, infrared communication, Radio Control, Ultra-Wide Band (UWM), Wireless USB, and Near Field Communication (NFC), and BLE ( It may include communication modules such as Bluetooth Low Energy (SPP), SPP (Serial Port Profile), Wi-Fi Direct, infrared communication, Zigbee, and NFC (Near Field Communication). Additionally, communication modules can be implemented in the form of devices, S/W modules, circuits, chips, etc.

A plurality of sensors may be configured to detect various environmental conditions within the organic solvent recovery device. Among the plurality of sensors, the first sensor 110 detects the discharge pressure of the mixed gas discharged from the discharge pipe 100, and the first sensor 110 detects the discharge pressure of the mixed gas discharged from the discharge pipe 100. 2Sensor 120 may be configured to detect the amount of concentrated organic solvent flowing into the storage tank 400.

To describe in more detail the operation of the organic solvent recovery device according to an embodiment of the present invention controlled by a server and a plurality of sensors, the server determines that the discharge pressure detected from the first sensor 110 is the first of a plurality of preset standards. If it is more than 1 standard, the spray amount of washing water is increased from the plurality of scrubbers 200, and if it is less than the second standard, which is lower than the first standard among the plurality of standards, the mixed gas discharged from the discharge pipe 100 is supplied and cleaned. When the spraying of water is stopped and the second standard is exceeded, the supply of the mixed gas discharged from the discharge pipe 100 and the washing water are sprayed, and the inflow of the organic solvent detected by the second sensor 120 is adjusted to one of the plurality of standards. If it is below the third standard, the spray amount of washing water can be increased from the plurality of scrubbers 200, and the supply amount of mixed gas discharged from the discharge pipe 100 can be controlled to increase. For example, if the discharge pressure detected by the first sensor 110 is higher than the first standard among the plurality of standards, in this case, as the amount of mixed gas discharged through the discharge pipe 100 increases, the amount of organic solvent to be recovered increases. This means that the amount has increased, and therefore, the server controls to increase the amount of washing water sprayed from the plurality of scrubbers 200 so that a larger amount of the organic solvent is absorbed into the washing water. On the other hand, if it is lower than the second standard, which is lower than the first standard, the amount of organic solvent to be recovered decreases as the amount of mixed gas discharged through the discharge pipe 100 decreases, and therefore, rather than processing it continuously, the amount of organic solvent is reduced through the discharge pipe 100. The injection of the mixed gas and washing water supplied from (100) is stopped, and when the discharge pressure detected by the first sensor (110) is detected to be within the normal range, the process is started again, thereby saving the energy required for the recovery process. It can be done.

In addition, if the inflow amount of the organic solvent detected by the second sensor 120 is less than the third standard among the plurality of standards, the recovery rate is low compared to the amount of mixed gas currently supplied, and therefore, the injection from the plurality of scrubbers 200 By increasing the amount of washing water used, the recovery rate can be raised to the normal range. Meanwhile, the fact that it is below the third standard among these multiple standards may be because the amount of mixed gas supplied from the discharge pipe 100 is small, and thus the supply amount of mixed gas may be controlled to increase.

Figure 4 is a diagram showing the configuration of an injection member according to an embodiment of the present invention. Referring to FIG. 4, the spraying member of the scrubber includes a housing 221 including a through groove 222 provided inside to allow cleansing water to pass through, and a spray cap 223 that is coupled to one area of the housing 221 and sprays cleansing water. ) includes.

The spray member serves as an outlet that sprays the cleansing water evenly so that the cleansing water circulates more efficiently within the scrubber. The cleaning water may pass through the through groove 222 provided inside the spray member and be sprayed in all directions through the spray cap 223 coupled to one area of the housing 221. Meanwhile, the injection cap 223 includes a plurality of upper injection openings 224 and a lower injection opening, and the plurality of upper injection openings 224 includes a first injection opening 226 and a second injection opening 225, and the first injection opening 224 includes a first injection opening 226 and a second injection opening 225. 226 and the second nozzle 225 each include a first inner pipe and a second inner pipe, which are passages through which washing water flows.

The lower jet port of the spray cap 223 is porous, so that the cleaning water is sprayed uniformly downward. At this time, if only the lower jet port exists, the cleaning water is not supplied to the upper side, but can only be supplied to the lower side. In this case, the scrubber Since the circulation of the washing water cannot be performed uniformly, the circulation of the washing water can be made more uniform by spraying the washing water upward through the upper spray opening 224.

The upper injection port 224 has a plurality of injection ports, and the plurality of injection ports consists of a first injection port 226 and a second injection port 225. The first injection opening 226 has a first inclination angle 228 inclined upward in a direction parallel to the ground, and the second injection opening 225 has a second inclination angle 227 inclined more upward from the first inclination angle 228. ) has. Preferably, the first inclination angle 228 may be 20 to 30 degrees upward in a direction parallel to the ground, and the second inclination angle 227 may be 20 to 30 degrees upward in a direction parallel to the ground in the first inclination angle 228. It may be the second inclination angle (227) of degrees. At this time, the second injection port 225 may be provided with a longer length than the first injection port 226. This is to ensure that the second nozzle 225 is located closer to the upper side of the scrubber so that the cleaning water circulates more smoothly at the upper side.

The first nozzle 226 and the second nozzle 225 each include a first inner pipe and a second inner pipe, which are passages through which cleaning water flows, and the diameter of one area of the second inner pipe is that of one area of the first inner pipe. It is larger than the diameter, and the diameter 229 of one surface where the washing water is sprayed from the first and second inner pipes may be configured to have the same size. Since the inclination angle of the second injection port 225 is upward, if the inner pipe is made of the same diameter, the discharge pressure at which the washing water is sprayed may be lower compared to the first injection port 226. To solve this, the second injection port 225 The amount of washing water injected into (225) is increased, but the diameter of one side discharged (229) is made the same as that of the first nozzle 226, so that the discharge pressure is adjusted to the discharge of the washing water sprayed from the second nozzle 225. It increases the pressure. Through this, more washing water can be circulated to the upper side, and through this, the recovery rate of organic solvents can be increased.

In the above, preferred embodiments of the present invention have been shown and described, but the present invention is not limited to the specific embodiments described above, and may be used in the technical field to which the invention pertains without departing from the gist of the present invention as claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be understood individually from the technical idea or perspective of the present invention.

100: discharge pipe
110: first sensor
120: Second sensor
200: Multiple scrubbers
210: First scrubber
220: Second scrubber
221: housing
222: Through groove
223: Spray cap
224: Upper nozzle
225: Second nozzle
226: 1st nozzle
227: Second inclination angle
228: First inclination angle
229: Diameter of one side
300: Distillation column
400: storage tank

Claims (3)

In the organic solvent recovery device,
A discharge pipe that discharges a mixed gas containing an organic solvent whose boiling point exceeds 100°C at 1 atm;
a scrubber that sprays cleaning water into the mixed gas supplied from the discharge pipe;
a distillation tower for separating the washing water and the organic solvent by distilling a mixture of the organic solvent and the washing water supplied from a lower area of the scrubber; and
It includes a storage tank for separately storing the concentrated organic solvent and washing water separated from the distillation tower,
The scrubber may be composed of a plurality of scrubbers, and the plurality of scrubbers include a first scrubber and a second scrubber to which the mixed gas that has passed through the first scrubber is supplied,
The concentration of the first mixture supplied to the distillation tower from the first scrubber is higher than the concentration of the second mixture supplied to the distillation tower from the second scrubber,
It further includes a plurality of sensors and a server network connected to the plurality of sensors,
Among the plurality of sensors, a first sensor detects the discharge pressure of the mixed gas discharged from the discharge pipe, and the second sensor detects the inflow amount of the concentrated organic solvent flowing into the storage tank,
It includes a server network-connected to the plurality of sensors,
If the discharge pressure detected by the first sensor is higher than the first standard among the plurality of preset standards, the server increases the spray amount of washing water from the plurality of scrubbers, and increases the spray amount of washing water from the plurality of scrubbers when the discharge pressure is lower than the first standard among the plurality of standards. If it is below the second standard, stop supplying the mixed gas discharged from the discharge pipe and spraying the washing water, and when exceeding the second standard, stop supplying the mixed gas discharged from the discharge pipe and spraying the washing water. ,
If the inflow amount of organic solvent detected by the second sensor is less than the third standard among the plurality of standards, the server increases the spray amount of washing water from the plurality of scrubbers, and increases the supply amount of the mixed gas discharged from the discharge pipe. An organic solvent recovery device characterized in that it is controlled to increase.
delete According to paragraph 1,
The scrubber includes a spray member through which cleaning water is sprayed,
The injection member is
It includes a housing including a through groove provided to allow cleaning water to pass therein; and a spray cap coupled to one area of the housing to spray cleaning water,
The injection cap includes a plurality of upper injection ports and a lower injection port.
The plurality of upper injection ports include a first injection port and a second injection port,
The first injection port has a first inclination angle of 20 to 30 degrees upward in the direction parallel to the ground, and the second injection port is longer than the first injection port and inclines 20 degrees upward in the direction parallel to the ground at the first inclination angle. It has a second inclination angle of 30 degrees,
The first injection port and the second injection port include a first inner pipe and a second inner pipe, respectively, which are passages through which cleaning water flows,
The diameter of one region of the second inner pipe is larger than the diameter of one region of the first inner pipe, and the diameters of one surface where washing water is sprayed from each of the first and second inner pipes are the same size. Organic solvent recovery device.