A distillation tower for NMP solution recovery

Abstract

The utility model belongs to the technical field of NMP solution treatment, and particularly relates to a distillation tower for NMP solution recovery, comprising a fixed ring and a distillation tower body, wherein the distillation tower body is fixedly mounted on the inner wall of the fixed ring, a recovery mechanism is arranged on one side of the outer surface of the fixed ring, and a stirring mechanism is arranged inside the distillation tower body. The distillation tower for NMP solution recovery can flow the deposited waste liquid after distillation into a recovery box through a connecting pipe and filter through a filter plate to separate solid impurities and deposited waste liquid, and then the deposited waste liquid enters a pump box through an extraction pipe and then enters the distillation tower body through a reflux pipe for distillation to reduce production costs. By arranging a stirring mechanism inside the distillation tower body, when the distillation tower body performs a recovery and distillation operation on the NMP solution, the stirring rod can be driven to rotate by a transmission shaft to stir the solution, thereby improving the distillation efficiency, and at the same time, when the transmission shaft rotates, the connecting rod and the scraper are driven to scrape the residue on the inner wall of the distillation tower body.

Description

Technical Field

[0001] The utility model relates to the technical field of NMP solution treatment, in particular to a distillation tower used for recovering NMP solution. Background Art

[0002] NMP is widely used in the refining of high-grade lubricating oils, the synthesis of polymers, insulating materials, pesticides, pigments, cleaning agents, etc. It is used as an absorbent for acetylene and high-grade alkynes in the natural gas to acetylene industry. NMP waste liquid needs to be recovered and distilled.

[0003] At present, the sedimentation solution after waste liquid distillation is mostly simply discharged or landfilled without being reused, which greatly wastes resources, reduces resource utilization and increases production costs.

[0004] As disclosed in Chinese patent CN203264314U, a distillation tower solution recovery device comprises a distillation tower furnace body and a waste liquid discharge pipe, wherein the waste liquid discharge pipe is installed at the bottom of the distillation tower furnace body, and is characterized in that: it also comprises a solution recovery device, wherein the solution recovery device is installed at the bottom of the distillation tower furnace body, on the side opposite to the waste liquid discharge pipe. The purpose of the utility model is to provide a distillation tower solution recovery device with a simple structure, which can recycle and reuse the sediment solution of a conventional distillation tower.

[0005] However, the distillation tower solution recovery device lacks a mechanism for filtering and separating the recovered solution, which may result in the presence of deposited solid impurities in the recovered solution.

[0006] For this reason, we propose a distillation tower for NMP solution recovery to solve the above problems. Utility Model Content

[0007] The utility model aims to provide a distillation tower for recovering NMP solution to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a distillation tower for NMP solution recovery, comprising a fixed ring and a distillation tower body, wherein the distillation tower body is fixedly mounted on the inner wall of the fixed ring, a circular hole is penetrated on one side of the inner bottom surface of the distillation tower body, a recovery mechanism is arranged on one side of the outer surface of the fixed ring, and a stirring mechanism is arranged inside the distillation tower body;

[0009] The recovery mechanism includes a filtering unit and an extraction unit, and the filtering unit includes a connecting pipe, a recovery box, a baffle, a discharge pipe, a filter plate, a filter hole and a through hole. The connecting pipe is fixedly installed on the inner wall of the circular hole, the recovery box is fixedly installed on the side of one end of the connecting pipe, the through hole penetrates the inner wall of the recovery box, the baffle is clamped on the inner wall of the recovery box, the discharge pipe is installed on one side of the bottom surface of the recovery box, the filter plate is installed on the inner wall of the recovery box, and the filter hole penetrates the side of the filter plate.

[0010] Preferably, the extraction unit comprises a pump case, an extraction pipe and a return pipe, the pump case is fixedly mounted on the upper surface of the recovery box, the extraction pipe is fixedly mounted on the side of the pump case, and the return pipe is fixedly mounted on the upper surface of the pump case.

[0011] Preferably, the stirring mechanism includes a feeding unit and a scraping unit, the feeding unit includes a feeding pipe, a connecting flange, a valve body, a valve stem and a valve plate, the feeding pipe is fixedly installed on the upper part of the outer surface of the distillation tower body, the connecting flange is fixedly installed on one side of the outer surface of the feeding pipe, the valve body is fixedly installed on the side of the connecting flange, the valve stem is installed on the inner wall of the valve body, and the valve plate is fixedly installed on the outer surface of the valve stem.

[0012] Preferably, the scraping unit includes a cover plate, a drive motor, a transmission shaft, a stirring rod, a connecting rod and a scraper, the cover plate is fixedly installed on the upper surface of the distillation tower body, the drive motor is fixedly installed in the middle position of the upper surface of the cover plate, the transmission shaft is fixedly installed on the output end of the drive motor, the stirring rod is fixedly installed on the outer surface of the transmission shaft, the connecting rod is fixedly installed on the upper part of the outer surface of the transmission shaft, and the scraper is fixedly installed on the side of one end of the connecting rod.

[0013] Preferably, support columns are fixedly installed on the bottom surface of the fixed circular ring, and support bases are fixedly installed on the bottom surfaces of the support columns, and the support columns are sequentially distributed on the bottom surface of the fixed circular ring at equal intervals.

[0014] Preferably, a hole is passed through the middle of the upper surface of the cover plate, the upper end of the transmission shaft passes through the hole and is fixedly connected to the output end of the driving motor, the stirring rods are distributed on the outer surface of the transmission shaft in sequence with equal intervals, and the side surface of one end of the scraper contacts the inner wall of the distillation tower body.

[0015] Preferably, a hole is penetrated on one side of the bottom surface of the recovery box, and the discharge pipe is fixedly installed on the inner wall of the hole. A hole is penetrated on one side of the upper surface of the recovery box, and the extraction pipe passes through the hole and extends into the interior of the recovery box.

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

[0017] 1. The distillation tower for NMP solution recovery can be provided with a recovery mechanism to allow the deposited waste liquid after distillation to flow into a recovery box through a connecting pipe and be filtered through a filter plate to separate solid impurities and the deposited waste liquid. The deposited waste liquid then enters a pump box through an extraction pipe and then enters the distillation tower body through a reflux pipe for distillation to reduce production costs.

[0018] 2. The distillation tower for recovering NMP solution is provided with a stirring mechanism inside the distillation tower body. When the distillation tower body is performing a recovery and distillation operation on the NMP solution, the stirring rod is driven by the transmission shaft to rotate to stir the solution, thereby improving the distillation efficiency. At the same time, when the transmission shaft rotates, the connecting rod and the scraper are driven to rotate together, so that the scraper scrapes off the residue on the inner wall of the distillation tower body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the stirring mechanism of the utility model;

[0021] Figure 3 for Figure 2 A schematic diagram of the local enlarged structure at point A in the middle;

[0022] Figure 4 It is a schematic diagram of the structure of the recycling mechanism of the utility model.

[0023] In the figure: 1. fixed ring; 2. support column; 201. support base; 3. distillation tower body; 301. feed pipe; 302. connecting flange; 303. valve body; 304. valve stem; 305. cover plate; 306. drive motor; 307. transmission shaft; 308. stirring rod; 309. connecting rod; 310. scraper; 311. round hole; 312. connecting pipe; 313. recovery box; 314. baffle; 315. discharge pipe; 316. filter plate; 317. filter hole; 318. pump chassis; 319. extraction pipe; 320. reflux pipe; 321. through hole; 4. valve plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 4 , the utility model provides a technical solution:

[0026] Embodiment 1: A distillation tower for recovering NMP solution, comprising a fixed ring 1 and a distillation tower body 3, wherein the distillation tower body 3 is fixedly mounted on the inner wall of the fixed ring 1, a circular hole 311 is penetrated on one side of the inner bottom surface of the distillation tower body 3, a support column 2 is fixedly mounted on the bottom surface of the fixed ring 1, a support base 201 is fixedly mounted on the bottom surface of the support column 2, the support columns 2 are sequentially distributed on the bottom surface of the fixed ring 1 at equal intervals, a recovery mechanism is arranged on one side of the outer surface of the fixed ring 1, and a stirring mechanism is arranged inside the distillation tower body 3;

[0027] The recovery mechanism includes a filtering unit and an extraction unit. The filtering unit includes a connecting pipe 312, a recovery box 313, a baffle 314, a discharge pipe 315, a filter plate 316, a filter hole 317 and a through hole 321. The connecting pipe 312 is fixedly installed on the inner wall of the circular hole 311, the recovery box 313 is fixedly installed on the side of one end of the connecting pipe 312, the through hole 321 penetrates the inner wall of the recovery box 313, the baffle 314 is clamped on the inner wall of the recovery box 313, the discharge pipe 315 is installed on one side of the bottom surface of the recovery box 313, the filter plate 316 is installed on the inner wall of the recovery box 313, the filter hole 317 penetrates the side of the filter plate 316, one side of the inner bottom surface of the recovery box 313 is penetrated with a hole, the discharge pipe 315 is fixedly installed on the inner wall of the hole, one side of the upper surface of the recovery box 313 is penetrated with a hole, and the extraction pipe 319 passes through the hole and extends into the interior of the recovery box 313.

[0028] The extraction unit includes a pump case 318, an extraction pipe 319 and a reflux pipe 320. The pump case 318 is fixedly installed on the upper surface of the recovery box 313, the extraction pipe 319 is fixedly installed on the side of the pump case 318, and the reflux pipe 320 is fixedly installed on the upper surface of the pump case 318. By setting up a recovery mechanism, the sedimentation waste liquid after distillation can flow into the recovery box 313 through the connecting pipe 312 and be filtered through the filter plate 316 to separate solid impurities and sedimentation waste liquid. After that, the sedimentation waste liquid enters the pump case 318 through the extraction pipe 319 and then enters the distillation tower body 3 through the reflux pipe 320 for distillation to reduce production costs.

[0029] After the NMP solution is distilled inside the distillation tower body 3, the deposited solution flows into the connecting pipe 312 through the circular hole 311 and enters the recovery box 313. The deposited solution contains solid particles, which are filtered and separated by the filter plate 316. The solid particles are discharged from the recovery box 313 through the discharge pipe 315. The pump box 318 is started. The pump box 318 extracts the separated deposited solution through the extraction pipe 319 and then inputs it into the reflux pipe 320 to reflux to the inside of the distillation tower body 3 for distillation operation.

[0030] Embodiment 2: Based on embodiment 1, the stirring mechanism includes a feeding unit and a scraping unit, the feeding unit includes a feeding pipe 301, a connecting flange 302, a valve body 303, a valve stem 304 and a valve plate 4, the feeding pipe 301 is fixedly installed on the upper part of the outer surface of the distillation tower body 3, the connecting flange 302 is fixedly installed on one side of the outer surface of the feeding pipe 301, the valve body 303 is fixedly installed on the side of the connecting flange 302, the valve stem 304 is installed on the inner wall of the valve body 303, and the valve plate 4 is fixedly installed on the outer surface of the valve stem 304.

[0031] The scraping unit includes a cover plate 305, a drive motor 306, a transmission shaft 307, a stirring rod 308, a connecting rod 309 and a scraper 310. The cover plate 305 is fixedly mounted on the upper surface of the distillation tower body 3, the drive motor 306 is fixedly mounted in the middle of the upper surface of the cover plate 305, the transmission shaft 307 is fixedly mounted on the output end of the drive motor 306, the stirring rod 308 is fixedly mounted on the outer surface of the transmission shaft 307, the connecting rod 309 is fixedly mounted on the upper outer surface of the transmission shaft 307, the scraper 310 is fixedly mounted on the side of one end of the connecting rod 309, and a hole is penetrated in the middle of the upper surface of the cover plate 305. The upper end of the driving shaft 307 passes through the hole and is fixedly connected to the output end of the driving motor 306. The stirring rods 308 are distributed on the outer surface of the transmission shaft 307 in sequence at equal intervals. The side surface of one end of the scraper 310 contacts the inner wall of the distillation tower body 3. By arranging a stirring mechanism inside the distillation tower body 3, the stirring rod 308 can be driven by the transmission shaft 307 to rotate when the distillation tower body 3 performs a recovery distillation operation on the NMP solution to stir the solution, thereby improving the distillation efficiency. At the same time, when the transmission shaft 307 rotates, the connecting rod 309 and the scraper 310 are driven to rotate together, so that the scraper 310 scrapes off the residue on the inner wall of the distillation tower body 3.

[0032] The NMP solution pipeline is connected to the valve body 303, and the valve stem 304 is rotated to drive the valve plate 4 to rotate and open the internal channel of the valve body 303 to input the NMP solution into the distillation tower body 3 through the feed pipe 301 for distillation. During distillation, the power supply of the drive motor 306 is started so that the drive motor 306 works to drive the transmission shaft 307 to rotate, thereby driving the stirring rod 308 to rotate to stir the NMP solution inside the distillation tower body 3 during distillation to improve the distillation efficiency. At the same time, when the transmission shaft 307 rotates, the connecting rod 309 and the scraper 310 rotate with the transmission shaft 307, and the side of the scraper 310 contacts the inner wall of the distillation tower body 3 to scrape and clean the substances remaining on the inner wall of the distillation tower body 3.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A distillation tower for recovering NMP solution, comprising a fixed ring (1) and a distillation tower body (3), wherein the distillation tower body (3) is fixedly mounted on the inner wall of the fixed ring (1), and a circular hole (311) is penetrated on one side of the inner bottom surface of the distillation tower body (3), characterized in that: A recovery mechanism is provided on one side of the outer surface of the fixed ring (1), and a stirring mechanism is provided inside the distillation tower body (3); The recovery mechanism comprises a filtering unit and an extraction unit. The filtering unit comprises a connecting pipe (312), a recovery box (313), a baffle (314), a discharge pipe (315), a filter plate (316), a filter hole (317) and a through hole (321). The connecting pipe (312) is fixedly mounted on the inner wall of the circular hole (311). The recovery box (313) is fixedly mounted on the side of one end of the connecting pipe (312). The through hole (321) penetrates the inner wall of the recovery box (313). The baffle (314) is clamped on the inner wall of the recovery box (313). The discharge pipe (315) is mounted on one side of the bottom surface of the recovery box (313). The filter plate (316) is mounted on the inner wall of the recovery box (313). The filter hole (317) penetrates the side of the filter plate (316).

2. A distillation tower for NMP solution recovery according to claim 1, characterized in that: The extraction unit comprises a pump case (318), an extraction pipe (319) and a return pipe (320); the pump case (318) is fixedly mounted on the upper surface of the recovery box (313); the extraction pipe (319) is fixedly mounted on the side of the pump case (318); and the return pipe (320) is fixedly mounted on the upper surface of the pump case (318).

3. A distillation tower for NMP solution recovery according to claim 1, characterized in that: The stirring mechanism comprises a feeding unit and a scraping unit, wherein the feeding unit comprises a feeding pipe (301), a connecting flange (302), a valve body (303), a valve stem (304) and a valve lever (4), wherein the feeding pipe (301) is fixedly mounted on the upper portion of the outer surface of the distillation tower body (3), the connecting flange (302) is fixedly mounted on one side of the outer surface of the feeding pipe (301), the valve body (303) is fixedly mounted on the side of the connecting flange (302), the valve stem (304) is mounted on the inner wall of the valve body (303), and the valve lever (4) is fixedly mounted on the outer surface of the valve stem (304).

4. A distillation tower for NMP solution recovery according to claim 3, characterized in that: The scraping unit comprises a cover plate (305), a driving motor (306), a transmission shaft (307), a stirring rod (308), a connecting rod (309) and a scraper (310), wherein the cover plate (305) is fixedly mounted on the upper surface of the distillation tower body (3), the driving motor (306) is fixedly mounted at the middle position of the upper surface of the cover plate (305), the transmission shaft (307) is fixedly mounted on the output end of the driving motor (306), the stirring rod (308) is fixedly mounted on the outer surface of the transmission shaft (307), the connecting rod (309) is fixedly mounted on the upper outer surface of the transmission shaft (307), and the scraper (310) is fixedly mounted on the side surface of one end of the connecting rod (309).

5. A distillation tower for NMP solution recovery according to claim 1, characterized in that: The bottom surface of the fixed circular ring (1) is fixedly mounted with support columns (2), the bottom surface of the support columns (2) is fixedly mounted with support bases (201), and the support columns (2) are distributed sequentially at equal intervals on the bottom surface of the fixed circular ring (1).

6. A distillation tower for NMP solution recovery according to claim 4, characterized in that: A hole is formed in the middle of the upper surface of the cover plate (305), and the upper end of the transmission shaft (307) passes through the hole and is fixedly connected to the output end of the driving motor (306). The stirring rods (308) are distributed on the outer surface of the transmission shaft (307) at equal intervals, and the side surface of one end of the scraper (310) contacts the inner wall of the distillation tower body (3).

7. A distillation tower for NMP solution recovery according to claim 2, characterized in that: A hole is penetrated on one side of the inner bottom surface of the recovery box (313), and the discharge pipe (315) is fixedly installed on the inner wall of the hole. A hole is penetrated on one side of the upper surface of the recovery box (313), and the extraction pipe (319) passes through the hole and extends into the interior of the recovery box (313).

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