Energy-saving caprolactam production device

Abstract

The utility model provides an energy-saving caprolactam production device which comprises an extraction tower, the extraction tower is connected with a buffer tank through a pipeline, one side of the buffer tank is connected with a benzene-hexyl buffer tank through a pipeline, the benzene-hexyl buffer tank is connected with a reverse extraction tower through a pipeline, the reverse extraction tower is connected with a heat exchanger through a pipeline, and the heat exchanger is connected with a heat exchanger through a pipeline. The heat exchanger is connected with a heater through a pipeline, the heater is respectively connected with a first already-water preheater and a debenzolization tower through pipelines, and the debenzolization tower is respectively connected with an already-water buffer tank and a condensate tank through pipelines. According to the caprolactam energy-saving production device provided by the utility model, the use amount of low-pressure steam (t / h) can be saved by recovering the heat of the steam condensate for preheating a hexane solution, and the use amount of the low-pressure steam (t / h) can be saved by repeatedly utilizing the MVR evaporation secondary steam condensate for heat exchange and preheating the MVR evaporation secondary steam condensate with the residual liquid of the hexane extraction tower.

Description

Technical Field

[0001] The utility model relates to the field of caprolactam production, in particular to an energy-saving production device for caprolactam. Background Art

[0002] Caprolactam, full name ε-caprolactam, English name caprolactam, relative molecular weight: 113.16, molecular formula: C6H11NO, is a white flaky crystal or crystalline powder at room temperature, is easily soluble in water and chlorinated solvents, petroleum hydrocarbons, ethanol, ether, acetone, benzene and other organic reagents, and is prone to polymerization reaction when heated. Caprolactam is an important organic chemical raw material, widely used in the fields of textile, automobile, electronics, machinery, etc. Caprolactam is an important production raw material for three major synthetic fibers. Synthetic fibers have the characteristics of high strength, good wear resistance, resistance to alkali, oil, and water, and no moth-eaten and mildew, and are widely used. In addition, caprolactam is also an important medical material.

[0003] In the existing caprolactam refining device, the energy consumption is relatively high, especially the steam consumption, resulting in high production costs of caprolactam, a significant reduction in enterprise profits, and an increased pressure on the steam supply post.

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

[0005] The utility model provides an energy-saving production device for caprolactam, which solves the problems of relatively high energy consumption, especially steam consumption, in the existing caprolactam refining device, resulting in high production costs of caprolactam, a significant reduction in enterprise profits, and an increased pressure on the steam supply post.

[0006] To solve the above technical problems, an energy-saving production device for caprolactam provided by the utility model includes:

[0007] A hexane extraction tower, the hexane extraction tower is connected to a buffer tank through a pipeline, one side of the buffer tank is connected to a benzene-hexane buffer tank through a pipeline, the benzene-hexane buffer tank is connected to a back-extraction tower through a pipeline, the back-extraction tower is connected to a heat exchanger through a pipeline, the heat exchanger is connected to a heater through a pipeline, the heater is respectively connected to a first hexane-water preheater and a debenzolization tower through pipelines, and the debenzolization tower is respectively connected to a hexane-water buffer tank and a condensate tank through pipelines;

[0008] The hexane extraction tower is connected to a residual liquid preheater through a pipeline. The residual liquid preheater is respectively connected to a residual liquid stripping tower and a hexane-water heat exchanger through pipelines. The hexane-water heat exchanger is connected to a secondary condensate buffer tank discharge pump through a pipeline. The secondary condensate buffer tank discharge pump is connected to a secondary condensate buffer tank through a pipeline. The secondary condensate buffer tank is connected to an evaporator through a pipeline. The evaporator is connected to a separation tower through a pipeline. The separation tower is connected to a circulation pump through a pipeline.

[0009] Preferably, the first hexane-water preheater is connected to a residual liquid preheater through a pipeline.

[0010] Preferably, the separation tower is connected to the evaporator through a pipeline.

[0011] Preferably, the circulation pump is connected to the hexane-water heat exchanger through a pipeline.

[0012] Preferably, a bottom plate is provided at the bottom of the compressor. A protective component is provided between the bottom plate and the compressor. The protective component includes a protective cover. A rectangular block is connected to the side of the bottom plate. Fixing bolts are provided between the protective cover and the rectangular block.

[0013] Preferably, a dust-proof component is provided on the surface of the bottom plate. The dust-proof component includes two sliding grooves. Sliders are slidably connected inside both of the two sliding grooves. A dust-proof cover is connected between the two sliders.

[0014] Preferably, sealing plates are provided at both ends of the protective cover.

[0015] Compared with the related art, a caprolactam energy-saving production device provided by the present invention has the following beneficial effects:

[0016] The present invention provides a caprolactam energy-saving production device. By recovering the heat of steam condensate for preheating the hexane aqueous solution, the consumption of low-pressure steam can be saved by t / h.

[0017] By recycling and reusing the heat exchange of the MVR evaporation secondary steam condensate for preheating the residual liquid of the hexane extraction tower, the consumption of low-pressure steam can be saved by t / h. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a first embodiment of a caprolactam energy-saving production device provided by the present invention;

[0019] Figure 2 is a schematic structural diagram of a second embodiment of a caprolactam energy-saving production device provided by the present invention;

[0020] Figure 3 is Figure 2 the enlarged schematic view of part A shown in;

[0021] Figure 4 For Figure 2 the three-dimensional structural schematic diagram of the whole device shown

[0022] Reference numerals in the figure: 100, hexane extraction tower; 101, buffer tank; 102, benzene-hexane buffer tank; 103, back extraction tower; 104, heat exchanger; 105, heater; 106, debenzolization tower; 107, hexane-water buffer tank; 108, condensate tank; 109, residual liquid stripping tower; 200, hexane-water heat exchanger; 201, compressor; 203, secondary condensate buffer tank; 202, secondary condensate buffer tank discharge pump; 204, evaporator; 205, separation tower; 206, circulation pump; 300, first hexane-water preheater; 301, first hexane-water preheater; 302, residual liquid preheater

[0023] 400, bottom plate

[0024] 50, protection component; 501, protective cover; 502, rectangular block; 503, fixing bolt

[0025] 60, dust-proof component; 601, chute; 602, slider; 603, dust-proof cover

[0026] 700, sealing plate Specific embodiments

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments

[0028] First embodiment

[0029] Please refer to Figure 1 , wherein Figure 1 is the structural schematic diagram of the first embodiment of a caprolactam energy-saving production device provided by the present invention. A caprolactam energy-saving production device includes

[0030] A hexane extraction tower 100, the hexane extraction tower 100 is connected to a buffer tank 101 through a pipeline, one side of the buffer tank 101 is connected to a benzene-hexane buffer tank 102 through a pipeline, the benzene-hexane buffer tank 102 is connected to a back extraction tower 103 through a pipeline, the back extraction tower 103 is connected to a heat exchanger 104 through a pipeline, the heat exchanger 104 is connected to a heater 105 through a pipeline, the heater 105 is respectively connected to a first hexane-water preheater 300 and a debenzolization tower 106 through pipelines, and the debenzolization tower 106 is respectively connected to a hexane-water buffer tank 107 and a condensate tank 108 through pipelines

[0031] The extracted tower 100 is connected with a residual liquid preheater 302 through a pipeline. The residual liquid preheater 302 is respectively connected with a residual liquid stripping tower 109 and a hexane-water heat exchanger 200 through pipelines. The hexane-water heat exchanger 200 is connected with a secondary condensate buffer tank discharge pump 202 through a pipeline. The secondary condensate buffer tank discharge pump 202 is connected with a secondary condensate buffer tank 203 through a pipeline. The secondary condensate buffer tank 203 is connected with an evaporator 204 through a pipeline. The evaporator 204 is connected with a separation tower 205 through a pipeline. The separation tower 205 is connected with a circulation pump 206 through a pipeline.

[0032] The first hexane-water preheater 300 is connected with the residual liquid preheater 302 through a pipeline.

[0033] The separation tower 205 is connected with the evaporator 204 through a pipeline.

[0034] The circulation pump 206 is connected with the hexane-water heat exchanger 200 through a pipeline.

[0035] The production component includes that the hexane-water at the cold-side hexane-water outlet of the hexane-water heat exchanger 200 enters the inlet of the top tube side of the evaporator 204. The bottom discharge of the evaporator 204 enters the lower part of the separation tower 205. The water vapor at the top outlet of the evaporator 204 enters the inlet of the compressor 201. The discharged and pressurized water vapor from the compressor 201 enters the upper shell side of the evaporator 204 as a heating heat source. The secondary condensate in the lower shell side of the evaporator 204 enters the secondary condensate buffer tank 203. The secondary condensate buffer tank 203 enters the hot side of the hexane-water heat exchanger 200. The outlet of the hot side of the hexane-water heat exchanger 200 enters the inlet of the shell side of the residual liquid condenser 302. The discharge from the shell side of the residual liquid condenser 302 goes to the condensate collection system.

[0036] Benzene and crude caprolactam are extracted at the top outlet of the extraction tower 100, and the benzene-hexane liquid enters the buffer tank 101. The bottom discharge of the buffer tank 101 enters the top of the benzene-hexane buffer tank 102. The bottom discharge of the benzene-hexane buffer tank 102 enters the bottom of the back-extraction tower 103. Process condensate is added from the bottom of the back-extraction tower 103 for water extraction. The hexane-water liquid after extraction in the back-extraction tower 103 enters the inlet of the tube side of the heat exchanger 104 from the bottom outlet. The outlet of the tube side of the heat exchanger 104 enters the cold-side inlets of the first hexane-water preheater 300 and the first hexane-water preheater 301. The cold-side outlets of the first hexane-water preheater 300 and the first hexane-water preheater 301 enter the cold-side inlet of the heater 105. The cold-side outlet of the heater 105 enters the top inlet of the debenzolization tower 106. The hexane-water liquid after debenzolization in the debenzolization tower 106 enters the hexane-water buffer tank 107 from the bottom outlet. The steam condensate collected in the condensate tank 108 enters the hot-side inlets of the first hexane-water preheater 300 and the first hexane-water preheater 301. The hot-side outlets of the first hexane-water preheater 300 and the first hexane-water preheater 301 are sent to each condensate water station.

[0037] Compared with the related technologies, a caprolactam energy-saving production device provided by the present utility model has the following beneficial effects:

[0038] The present utility model provides a caprolactam energy-saving production device. By recovering the heat of steam condensate for preheating the aqueous caprolactam solution, the consumption of low-pressure steam can be saved by 3.2 t / h.

[0039] By recycling and reusing the heat exchange of the MVR evaporation secondary steam condensate for preheating the residue liquid of the caprolactam extraction tower, the consumption of low-pressure steam can be saved by 2 t / h.

[0040] Second Embodiment

[0041] Please refer to Figure 2 , Figure 3 and Figure 4 Based on a caprolactam energy-saving production device provided in the first embodiment of the present application, the second embodiment of the present application proposes another caprolactam energy-saving production device. The second embodiment is only a preferred mode of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0042] Specifically, the difference of a caprolactam energy-saving production device provided in the second embodiment of the present application is that for a caprolactam energy-saving production device, a bottom plate 400 is provided at the bottom of the compressor 201, and a protection assembly 50 is provided between the bottom plate 400 and the compressor 201. The protection assembly 50 includes a protection cover 501. A rectangular block 502 is connected to the side of the bottom plate 400, and a fixing bolt 503 is provided between the protection cover 501 and the rectangular block 502.

[0043] A dust-proof assembly 60 is provided on the surface of the bottom plate 400. The dust-proof assembly 60 includes two sliding grooves 601. Sliders 602 are slidably connected inside the two sliding grooves 601, and a dust-proof cover 603 is connected between the two sliders 602.

[0044] The use of the slider 602 and the sliding groove 601 facilitates the installation of the dust-proof cover 603 on the surface of the bottom plate 400. The shapes of the sliding groove 601 and the slider 602 are T-shaped.

[0045] Sealing plates 700 are provided at both ends of the protection cover 501.

[0046] A lock is installed on the sealing plate 700. The use of the dust-proof cover 603 can play a role in dust prevention when the compressor 201 is not working.

[0047] The working principle of a caprolactam energy-saving production device provided by the present utility model is as follows:

[0048] During use, when the compressor 201 is operating, the dust cover 603 inside the protective cover 501 is pulled and moved outward. When the dust cover 603 moves outward, the slider 602 at the bottom is driven to move inside the chute 601 until the dust cover 603 is separated from the bottom plate 400, so that heat dissipation can be achieved through the protective cover 501 when the compressor 201 is operating.

[0049] Compared with the related art, a caprolactam energy-saving production device provided by the present utility model has the following beneficial effects:

[0050] The present utility model provides a caprolactam energy-saving production device. A bottom plate 400 is arranged at the bottom of the compressor 201, and a protection component 50 and a dust-proof component 60 are arranged on the surface of the bottom plate 400, which can protect and prevent dust from the exposed compressor 201.

[0051] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A caprolactam energy-saving production device, characterized in that: include: A hexane extraction tower and a compressor, the hexane extraction tower is connected to a buffer tank via a pipeline, one side of the buffer tank is connected to a benzene-hexane buffer tank via a pipeline, the benzene-hexane buffer tank is connected to a stripping tower via a pipeline, the stripping tower is connected to a heat exchanger via a pipeline, the heat exchanger is connected to a heater via a pipeline, the heater is respectively connected to a first hexane water preheater and a debenzene tower via pipelines, and the debenzene tower is respectively connected to a hexane water buffer tank and a condensate tank via pipelines; The hexyl extraction tower is connected to a residual liquid preheater through a pipeline, the residual liquid preheater is respectively connected to a residual liquid stripping tower and a hexyl water heat exchanger through pipelines, the hexyl water heat exchanger is connected to a secondary condensate buffer tank discharge pump through a pipeline, the secondary condensate buffer tank discharge pump is connected to a secondary condensate buffer tank through a pipeline, the secondary condensate buffer tank is connected to an evaporator through a pipeline, the evaporator is connected to a separation tower through a pipeline, and the separation tower is connected to a circulation pump through a pipeline.

2. The energy-saving caprolactam production device according to claim 1, characterized in that: The first water preheater is connected to a residual liquid preheater via a pipeline.

3. The energy-saving caprolactam production device according to claim 1, characterized in that: The separation tower is connected to the evaporator through a pipeline.

4. The energy-saving caprolactam production device according to claim 1, characterized in that: The circulating pump is connected to the water heat exchanger through a pipeline.

5. The energy-saving caprolactam production device according to claim 1, characterized in that: A bottom plate is provided at the bottom of the compressor, a protective assembly is provided between the bottom plate and the compressor, the protective assembly includes a protective cover, a rectangular block is connected to the side of the bottom plate, and a fixing bolt is provided between the protective cover and the rectangular block.

6. The energy-saving caprolactam production device according to claim 5, characterized in that: A dustproof component is arranged on the surface of the bottom plate. The dustproof component comprises two slide grooves. Slide blocks are slidably connected inside the two slide grooves. A dustproof cover is connected between the two slide blocks.

7. The energy-saving caprolactam production device according to claim 5, characterized in that: Sealing plates are arranged at both ends of the protective cover.

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