System for simultaneously recovering benzene and caprolactam
By designing a system including a stirrer, a distillation column, and a sprayer, the problem of separating and recovering solid particulate impurities in crude caprolactam solution was solved, achieving effective recovery of benzene and caprolactam, reducing production costs and increasing enterprise profits.
Patent Information
- Application Number
- CN202520049258.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-01-09
AI Technical Summary
The existing crude caprolactam benzene solution containing solid particulate impurities has not been effectively utilized, resulting in cost losses.
A system comprising a first stirrer, a distillation column, a second stirrer, a condenser, a buffer tank, a sprayer, and a static collector is used to separate solid particulate impurities and recover benzene and caprolactam through steps such as stirring, distillation, condensation, and washing.
This technology enables the separation of solid particulate impurities from crude caprolactam-benzene solution, the recovery of benzene and caprolactam, the reduction of production costs, and the increase of enterprise profits.
Smart Images
Figure CN223683055U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to chemical technology field relates to a system of recycling benzene and caprolactam simultaneously. BACKGROUND
[0002] A certain amount of crude caprolactam benzene solution containing solid particle impurities is produced in the production process of caprolactam. It is found through analysis of the crude caprolactam benzene solution that the solid particle impurities contained in the crude caprolactam benzene solution are formed by the accumulation of catalysts in the previous multiple processes. Although the content of the solid particle impurities in the crude caprolactam benzene solution is not high, due to long-term accumulation, part of the caprolactam and benzene has been polluted, resulting in that the crude caprolactam benzene solution containing solid particle impurities is directly sold without good utilization, causing cost loss to the enterprise. CONTENT
[0003] The utility model aims at providing a system of recycling benzene and caprolactam simultaneously to solve the problem that the existing crude caprolactam benzene solution containing solid particle impurities is not utilized.
[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0005] The utility model provides a system of recycling benzene and caprolactam simultaneously, which comprises: a first stirrer, a distillation tower and a second stirrer connected with the first stirrer respectively, a condenser and a first buffer tank connected in sequence with the distillation tower, and a desalted water storage tank and a second buffer tank connected with the second stirrer respectively; a heating pipe is arranged on the bottom of the first stirrer and the second stirrer and all pipelines.
[0006] Preferably, the top of the first stirrer is provided with a first sprayer and a second sprayer, and the top of the second stirrer is provided with a third sprayer.
[0007] Preferably, the bottom of the distillation tower is further connected with the second sprayer.
[0008] Preferably, the bottom of the second stirrer is provided with a static collector, and the distance between the top of the static collector and the stirring paddle in the second stirrer is greater than 600mm.
[0009] Preferably, the bottom of the static collector is further connected with the first sprayer.
[0010] Preferably, the bottom of the distillation tower is provided with a heat exchanger.
[0011] The utility model has the following beneficial effects:
[0012] The system for simultaneously recovering benzene and caprolactam provided in the application can separate solid particle impurities from a crude caprolactam benzene solution containing the solid particle impurities, simultaneously recover benzene and caprolactam, reduce production cost, save raw material consumption, and improve enterprise profit. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 A structure schematic view of the system for simultaneously recovering benzene and caprolactam provided in the application is shown in the accompanying drawings.
[0014] Symbols:
[0015] 1 - first stirrer, 2 - distillation column, 3 - second stirrer, 4 - condenser, 5 - first buffer tank, 6 - desalted water storage tank, 7 - second buffer tank, 8 - first sprayer, 9 - second sprayer, 10 - third sprayer, 11 - static collector, 12 - heat exchanger. DETAILED DESCRIPTION
[0016] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.
[0017] The system for simultaneously recovering benzene and caprolactam provided in the embodiments of the application comprises a first stirrer 1, a distillation column 2, and a second stirrer 3, wherein the first stirrer 1 is connected with the distillation column 2 and the second stirrer 3 respectively, the distillation column 2 is further connected with a condenser 4 and a first buffer tank 5 in sequence, and the second stirrer 3 is connected with a desalted water storage tank 6 and a second buffer tank 7 respectively, as shown in the accompanying drawings. Figure 1
[0018] Specifically, the first stirrer 1 is a device for stirring a crude caprolactam benzene solution containing solid particle impurities and separating benzene. In the application, the temperature of the first stirrer 1 is 81-82℃. Under the stirring action of the first stirrer 1, benzene in the crude caprolactam benzene solution is evaporated and carries part of liquid caprolactam to overflow from the top of the first stirrer 1 into the distillation column 2; caprolactam and solid particle impurities in the crude caprolactam benzene solution enter the second stirrer 3 from the bottom of the first stirrer 1.
[0019] The crude caprolactam benzene solution containing solid particle impurities obtained from the distillation column has a high temperature, but since caprolactam is easy to crystallize at about 71℃, in order to ensure the mixing and separation effect of the crude caprolactam benzene solution in the first stirrer 1 and the second stirrer 3 and the operation safety, the bottom of the first stirrer 1 and the second stirrer 3 and all the pipelines are provided with heat tracing pipes.
[0020] In the distillation column 2, gaseous benzene and part of liquid caprolactam are distilled, and the benzene obtained from the top of the column has a high purity, which is condensed by the condenser 4 and stored in the first buffer tank 5, so as to realize the recovery of benzene. In addition, the bottom of the distillation column 2 in the present application is also connected to the top of the first stirrer 1, so that the mixture obtained from the bottom of the distillation column 2 reenters the first stirrer 1 through the circulating pump, and caprolactam is further recovered.
[0021] In the embodiment of the present application, the bottom of the distillation column 2 is provided with a heat exchanger 12, and 0.5MPa steam is introduced into the heat exchanger 12, so as to heat the distillation column 2 by the steam and keep the temperature of the top of the distillation column 2 at 80℃.
[0022] Further, in order to improve the concentration of benzene distilled from the distillation column 2, the height of the distillation column 2 in the embodiment of the present application is 60m, the diameter is 500mm, and the filler is poly-saddle ring.
[0023] In the second stirrer 3, the bottom of the second stirrer 3 is provided with a static collector 11, and the distance between the top of the static collector 11 and the stirring paddle in the second stirrer 3 is greater than 600mm. In the present application, the second stirrer 3 is controlled to be in a laminar flow state, at which time the movement speed of the fluid is slow, and the solid particle impurities are gradually deposited in the static collector 11, and at the same time, the liquid material gradually appears to be layered, and the caprolactam layer and the turbid liquid layer appear. The material in the caprolactam layer is sent to the second buffer tank 7, and then sent to the slicing workshop for treatment. The material in the turbid liquid layer is sent to the first stirrer 1 for re-separation.
[0024] In order to better wash the solid particle impurities, the top of the first stirrer 1 is provided with a first sprayer 8 and a second sprayer 9, the top of the second stirrer 3 is provided with a third sprayer 10, the bottom of the distillation column 2 is connected to the second sprayer 9, and the bottom of the static collector 11 is connected to the first sprayer 8. Thus, the crude caprolactam benzene solution containing solid particle impurities is sprayed into the first stirrer 1 through the first sprayer 8, the turbid liquid generated by the second stirrer 3 is also sprayed into the first stirrer 1 through the first sprayer 8, and the liquid from the bottom of the distillation column 2 is sprayed into the first stirrer 1 through the second sprayer 9.
[0025] In addition, the second stirrer 3 is also connected to a desalted water storage tank 6, and the desalted water in the desalted water storage tank 6 is uniformly sprayed into the second stirrer 3 through the third sprayer 10, so as to realize the full washing of the solid particle impurities.
[0026] The system for simultaneously recovering benzene and caprolactam provided by the embodiment of the present application, in use, first opens the heat tracing pipe belt of the whole system to ensure that the crude caprolactam benzene solution does not condense in the pipeline. The first stirrer 1 is started and the rotating speed is controlled at 30 r / min. The benzene overflowing from the upper part of the first stirrer 1 enters the distillation column 2. The overhead temperature of the distillation column 2 is controlled at 80℃ to ensure that the benzene is completely extracted. The column bottom liquid produced by the column bottom of the distillation column 2 is re-sprayed into the first stirrer 1 by the circulating pump and the second sprayer 9. The material produced at the bottom of the first stirrer 1 enters the second stirrer 3, and the desalted water is sprayed into the second stirrer 3. When the liquid level in the second stirrer 3 is stable, the second stirrer 3 is started, and the rotating speed of the second stirrer 3 is controlled to make the internal laminar flow, and then the solid particle impurities are deposited in the static collector 11, the caprolactam layer of caprolactam is sent to the second buffer tank 7, and the material of the turbid liquid layer is sent to the first stirrer 1 to be separated again.
[0027] The system for simultaneously recovering benzene and caprolactam provided by the embodiment of the present application can separate the solid particle impurities from the crude caprolactam benzene solution containing the solid particle impurities, simultaneously recover the benzene and caprolactam, reduce the production cost, save the raw material consumption, and improve the enterprise profit.
[0028] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A system for simultaneous recovery of benzene and caprolactam, characterized in that, The utility model relates to a kind of distillation tower and second agitator of first agitator. The top of the first agitator is provided with a first sprayer and a second sprayer, and the top of the second agitator is provided with a third sprayer.
2. The system for simultaneous recovery of benzene and caprolactam according to claim 1, characterized in that, The bottom of the distillation tower is further connected to the second sprayer.
3. The system for simultaneous recovery of benzene and caprolactam according to claim 2, characterized in that, The bottom of the second agitator is provided with a static collector, and the distance between the top of the static collector and the stirring paddle in the second agitator is greater than 600 mm.
4. The system for simultaneous recovery of benzene and caprolactam according to claim 2, characterized in that, The bottom of the static collector is further connected to the first sprayer.
5. The system for simultaneous recovery of benzene and caprolactam according to claim 4, characterized in that, The bottom of the distillation tower is provided with a heat exchanger.
6. The system for simultaneous recovery of benzene and caprolactam according to claim 1, characterized in that,