Caprolactam pre-concentration energy-saving production device

Abstract

The utility model provides a caprolactam pre-concentration energy-saving production device. The caprolactam pre-concentration energy-saving production device comprises a rearrangement reactor; and the rearrangement circulating pump is arranged at a bottom outlet of the rearrangement reactor. According to the caprolactam pre-concentration energy-saving production device, heat energy of rearranged and heat-exchanged circulating water is recycled, the trouble that the heat energy returns to a circulating water station and needs to be cooled by a cooling fan is avoided, process water is used instead of the circulating water through a closed process water system, the process water can be repeatedly used, and the production efficiency is improved. Materials in the caprolactam production device are pre-concentrated while the heat exchanger is prevented from scaling due to large temperature difference, steam consumption is reduced, property loss is reduced, the hexane water concentration can be increased to 45%-50% through the process, compared with 30% of a traditional process, on the premise that steam is saved, the device can be helped to break through the production load bottleneck, and the production efficiency is improved. Under the same steam consumption, higher load can be achieved, and the production device has the advantages of being low in investment, high in benefit, capable of expanding production energy and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of caprolactam production, in particular to a caprolactam pre-concentration energy-saving production device. Background Art

[0002] Caprolactam, full name ε-caprolactam, English name caprolactam, relative molecular weight: 113.16, molecular formula: C6H11NO, white flaky crystals or crystalline powder at room temperature, easily soluble in water and chlorinated solvents, petroleum hydrocarbons, ethanol, ether, acetone, benzene and other organic reagents, easy to undergo polymerization reaction when heated, caprolactam is an important organic chemical raw material, widely used in textile, automobile, electronics, machinery and other fields, caprolactam is an important production raw material for the three major synthetic fibers (polyester, acrylic and nylon), synthetic fibers have high strength, good wear resistance, alkali resistance, oil resistance, water resistance, no insect damage, no mildew and other characteristics, widely used, in addition, caprolactam is also an important pharmaceutical material.

[0003] In the existing caprolactam refining device, the basic components are ion exchange tower → hydrogenation in hydrogenation reactor → MVR evaporation concentration → distillation refining, which has high energy consumption and is affected by the caprolactam concentration. The production load is limited and cannot be operated at high load. Moreover, after the MVR compressor power reaches the rated power, the production load cannot be further increased.

[0004] Therefore, it is necessary to provide a caprolactam pre-concentration energy-saving production device to solve the above technical problems. Utility Model Content

[0005] The utility model provides a caprolactam pre-concentration energy-saving production device, which solves the problems of large steam consumption and inability to increase load.

[0006] In order to solve the above technical problems, the utility model provides a caprolactam pre-concentration energy-saving production device, comprising: a rearrangement reactor;

[0007] A rearrangement circulation pump, the rearrangement circulation pump is arranged at the bottom outlet of the rearrangement reactor, a rearrangement heat exchanger is arranged at the outlet of the rearrangement circulation pump, a process water tank is arranged on one side of the rearrangement heat exchanger, a process water circulation pump is arranged at the bottom outlet of the process water tank, and the process water circulation pump is connected to the inlet side of the tube side of the rearrangement heat exchanger;

[0008] A hexyl water buffer tank, an ion exchange tower is arranged on the right side of the hexyl water buffer tank, the bottom discharge of the ion exchange tower is connected to a high-level tank, the high-level tank is connected to a stirred reactor through a discharge pump, a filter is arranged around the outlet of the stirred reactor, a caprolactam pre-concentration tower is arranged at the right outlet of the filter, an evaporator is connected to the right side of the caprolactam pre-concentration tower, an evaporator pump is arranged on one side of the evaporator, a separation tower is connected to one side of the evaporator pump, and a compressor is arranged on the other side of the evaporator.

[0009] The circulating water after the rearrangement reaction heat exchange, which should have been returned to the circulating water station, is used for heat recovery and utilization. It is used as a heating heat source to concentrate the concentration of the caprolactam aqueous solution from 30% to 45-50%, which can evaporate 35-40 tons of water and save about 35t / h of low-pressure steam. The direct economic benefits are greater than 10 million yuan.

[0010] After the caprolactam pre-concentrator concentrates the caprolactam aqueous solution to 45-50%, it greatly reduces the load pressure of the subsequent process, improves the evaporation efficiency of the MVR evaporation compressor, and can increase the production capacity of the entire device by 10-20%

[0011] Preferably, a stirring tank is provided inside the stirred reactor, a slide groove is provided on the top of the inner cavity wall of the stirring tank, a cleaning device is rotatably installed inside the slide groove, a motor box is fixedly installed on the top of the stirred reactor, a servo motor is arranged inside the motor box, the output shaft of the servo motor is fixedly connected to a rotating shaft, and a driving gear is fixedly connected to the top of the outer surface of the rotating shaft.

[0012] Preferably, the cleaning device includes a driven gear, a sliding ring block and a scrubbing plate, the driven gear is meshed with the outer surface of the driving gear, the sliding ring block is fixedly installed in the middle of the outer surface of the driven gear, and the two scrubbing plates are respectively fixedly installed on both sides of the bottom of the driven gear.

[0013] Preferably, a stirring plate is fixedly mounted on the outer surface of the rotating shaft.

[0014] Preferably, bristles are provided on the side of the scrubbing plate close to the inner wall of the chute.

[0015] Preferably, the tooth block of the driven gear is arranged on the surface of the inner cavity wall.

[0016] Preferably, the sliding ring block and the sliding groove are matched.

[0017] Compared with the related art, the caprolactam pre-concentration energy-saving production device provided by the utility model has the following beneficial effects:

[0018] The utility model provides a caprolactam pre-concentration energy-saving production device, which recovers the heat energy of the circulating water after rearrangement and heat exchange, thereby avoiding the trouble of cooling by a cooling fan after the heat energy returns to the circulating water station, and uses process water instead of circulating water through a closed process water system, which can be reused many times, and pre-concentrates the materials in the caprolactam production device while avoiding scaling of the heat exchanger due to large temperature difference, thereby reducing steam consumption and property losses. The process can increase the caprolactam water concentration to 45%-50%, compared with 30% of the traditional process. Under the premise of saving steam, it can help the device break through the bottleneck of production load, and can open a higher load under the same steam consumption. The production device has the advantages of low investment, high benefit, and expanded production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a first embodiment of a caprolactam pre-concentration energy-saving production device provided by the utility model;

[0020] Figure 2 A structural schematic diagram of a second embodiment of a caprolactam pre-concentration energy-saving production device provided by the utility model;

[0021] Figure 3 for Figure 2 An enlarged schematic diagram of point A is shown.

[0022] Numbers in the figure: 300, rearrangement reactor, 301, rearrangement circulation pump, 302, rearrangement heat exchanger, 303, process water circulation pump, 304, process water tank, 305, hexane buffer tank, 306, ion exchange tower, 307, high-level tank, 308, stirred reactor, 309, filter, 310, pre-concentration tower, 311, compressor, 312, evaporator, 313, evaporator pump, 314, separation tower, 4, stirring tank, 5, slide, 6, motor box, 7, rotating shaft, 8, stirring plate, 9, driving gear, 10, cleaning device, 101, driven gear, 102, sliding ring block, 103, washing plate, 11, liquid inlet pipe. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0024] First embodiment

[0025] Please refer to Figure 1 ,in, Figure 1 The schematic diagram of the structure of the first embodiment of a caprolactam pre-concentration energy-saving production device provided by the utility model. A caprolactam pre-concentration energy-saving production device comprises: a rearrangement reactor 300;

[0026] A rearrangement circulation pump 301, the rearrangement circulation pump 301 is arranged at the bottom outlet of the rearrangement reactor 300, a rearrangement heat exchanger 302 is arranged at the outlet of the rearrangement circulation pump 301, a process water tank 304 is arranged on one side of the rearrangement heat exchanger 302, a process water circulation pump 303 is arranged at the bottom outlet of the process water tank 304, and the process water circulation pump 303 is connected to the pipe inlet side of the rearrangement heat exchanger 302;

[0027] A hexyl water buffer tank 305 is provided with an ion exchange tower 306 on the right side of the hexyl water buffer tank 305, the bottom discharge of the ion exchange tower 306 is connected to a high-level tank 307, the high-level tank 307 is connected to a stirred reactor 308 through a discharge pump, a filter 309 is provided around the outlet of the stirred reactor 308, a caprolactam pre-concentration tower 310 is provided at the right outlet of the filter 309, an evaporator 312 is connected to the right side of the caprolactam pre-concentration tower 310, an evaporator pump 313 is provided on one side of the evaporator 312, a separation tower 314 is connected to one side of the evaporator pump 313, and a compressor 311 is provided on the other side of the evaporator 312.

[0028] The working principle of a caprolactam pre-concentration energy-saving production device provided by the utility model is as follows:

[0029] During operation, cyclohexanone oxime and fuming sulfuric acid are first poured into the rearrangement reactor 300 to form a rearrangement liquid, and then heat is exchanged by the rearrangement circulation pump 301 and the rearrangement heat exchanger 302. The process water circulation pump 303 at the outlet of the process water tank 304 sends the process water to the pipe side of the rearrangement heat exchanger 302. The process water after heat exchange enters the pre-concentration tower 310 for heat exchange, and the process water after heat exchange returns to the process water tank 304.

[0030] The caprolactam liquid in the hexyl water buffer tank 305 will enter the ion exchange tower 306 for ion exchange, and then be transported to the high-level tank 307 again. The caprolactam liquid after ion exchange enters the stirred reactor 308, and after hydrogenation operation, it is filtered through the filter 309, and then enters the evaporator 312. The compressor 311 is started to fill the steam into the evaporator 312, so that the concentration of the caprolactam liquid is increased, and then the evaporator 312 will enter the separation tower 314, so that the steam enters the evaporator 312 through the compressor 311, and the separated caprolactam liquid will enter the evaporator 312. When the concentration of the caprolactam liquid is increased, the evaporator pump 313 will transport the caprolactam liquid to the subsequent process for further processing.

[0031] Compared with the related art, the caprolactam pre-concentration energy-saving production device provided by the utility model has the following beneficial effects:

[0032] The utility model provides a caprolactam pre-concentration energy-saving production device, which recovers the heat energy of the circulating water after rearrangement and heat exchange, thereby avoiding the trouble of cooling by a cooling fan after the heat energy returns to the circulating water station, and uses process water instead of circulating water through a closed process water system, which can be reused many times, and pre-concentrates the materials in the caprolactam production device while avoiding scaling of the heat exchanger due to large temperature difference, thereby reducing steam consumption and property losses. The process can increase the caprolactam water concentration to 45%-50%, compared with 30% of the traditional process. Under the premise of saving steam, it can help the device break through the bottleneck of production load, and can open a higher load under the same steam consumption. The production device has the advantages of low investment, high benefit, and expanded production capacity.

[0033] Second embodiment

[0034] Please refer to Figure 2 and Figure 3 Based on the energy-saving production device for pre-concentration of caprolactam provided in the first embodiment of the present application, the second embodiment of the present application proposes another energy-saving production device for pre-concentration of caprolactam. The second embodiment is only a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0035] Specifically, the second embodiment of the present application provides a caprolactam pre-concentration energy-saving production device. The difference is that, in a caprolactam pre-concentration energy-saving production device, a stirring tank 308 is provided with a stirring tank 4, a slide groove 5 is provided on the top of the inner cavity wall of the stirring tank 4, a cleaning device 10 is rotatably installed inside the slide groove 5, a motor box 6 is fixedly installed on the top of the stirred reactor 308, a servo motor is arranged inside the motor box 6, the output shaft of the servo motor is fixedly connected to a rotating shaft 7, and a driving gear 9 is fixedly connected to the top of the outer surface of the rotating shaft 7.

[0036] The cleaning device 10 includes a driven gear 101, a sliding ring block 102 and a scrubbing plate 103. The driven gear 101 is meshed with the outer surface of the driving gear 9. The sliding ring block 102 is fixedly installed in the middle of the outer surface of the driven gear 101. The two scrubbing plates 103 are respectively fixedly installed on both sides of the bottom of the driven gear 101.

[0037] A stirring plate 8 is fixedly mounted on the outer surface of the rotating shaft 7 .

[0038] The side of the scrubbing plate 103 close to the inner wall of the chute 5 is provided with bristles.

[0039] The gear blocks of the driven gear 101 are arranged on the surface of the inner cavity wall.

[0040] The sliding ring block 102 is matched with the sliding groove 5 .

[0041] The working principle of a caprolactam pre-concentration energy-saving production device provided by the utility model is as follows:

[0042] During operation, first, the output shaft of the servo motor rotates to drive the driving gear 9 to rotate and engage the driven gear 101 to rotate. The driven gear 101 rotates to drive the sliding ring block 102 to rotate inside the slide groove 5, and the two washing plates 103 slide and wash on the inner wall surface of the mixing tank 4.

[0043] Compared with the related art, the caprolactam pre-concentration energy-saving production device provided by the utility model has the following beneficial effects:

[0044] The utility model provides a caprolactam pre-concentration energy-saving production device, which drives a driving gear 9 to rotate and mesh with a driven gear 101 through the rotation of the output shaft of a servo motor, and the driven gear 101 rotates to drive two washing plates 103 to slide and wash on the inner cavity wall surface of a stirring tank 4. The device has a simple structure and strong practicality. The washing plates 103 rotate to stir the stirring material attached to the inner cavity wall surface of the stirring tank 4, thereby improving the stirring effect. When the stirring tank 4 is cleaned, the washing plates 103 wash the inner cavity wall surface of the stirring tank 4, thereby improving the cleaning effect.

[0045] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A caprolactam pre-concentration energy-saving production device, characterized in that: include: Rearrangement reactor; A rearrangement circulation pump, the rearrangement circulation pump is arranged at the bottom outlet of the rearrangement reactor, a rearrangement heat exchanger is arranged at the outlet of the rearrangement circulation pump, a process water tank is arranged on one side of the rearrangement heat exchanger, a process water circulation pump is arranged at the bottom outlet of the process water tank, and the process water circulation pump is connected to the inlet side of the tube side of the rearrangement heat exchanger; A hexyl water buffer tank, an ion exchange tower is arranged on the right side of the hexyl water buffer tank, the bottom discharge of the ion exchange tower is connected to a high-level tank, the high-level tank is connected to a stirred reactor through a discharge pump, a filter is arranged around the outlet of the stirred reactor, a caprolactam pre-concentration tower is arranged at the right outlet of the filter, an evaporator is connected to the right side of the caprolactam pre-concentration tower, an evaporator pump is arranged on one side of the evaporator, a separation tower is connected to one side of the evaporator pump, and a compressor is arranged on the other side of the evaporator.

2. A caprolactam pre-concentration energy-saving production device according to claim 1, characterized in that: A stirring tank is provided inside the stirred reactor, a slide groove is provided on the top of the inner cavity wall of the stirring tank, a cleaning device is rotatably installed inside the slide groove, a motor box is fixedly installed on the top of the stirred reactor, a servo motor is arranged inside the motor box, an output shaft of the servo motor is fixedly connected to a rotating shaft, and a driving gear is fixedly connected to the top of the outer surface of the rotating shaft.

3. A caprolactam pre-concentration energy-saving production device according to claim 2, characterized in that: The cleaning device comprises a driven gear, a sliding ring block and a scrubbing plate, wherein the driven gear is meshed with the outer surface of the driving gear, the sliding ring block is fixedly installed in the middle of the outer surface of the driven gear, and two scrubbing plates are respectively fixedly installed on both sides of the bottom of the driven gear.

4. A caprolactam pre-concentration energy-saving production device according to claim 2, characterized in that: A stirring plate is fixedly mounted on the outer surface of the rotating shaft.

5. The energy-saving production device for caprolactam pre-concentration according to claim 3, characterized in that: The side of the scrubbing plate close to the inner wall of the chute is provided with bristles.

6. The energy-saving production device for caprolactam pre-concentration according to claim 3, characterized in that: The gear block of the driven gear is arranged on the surface of the inner cavity wall.

7. The energy-saving production device for caprolactam pre-concentration according to claim 3, characterized in that: The sliding ring block is matched with the sliding groove.

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