Liquid phase rearrangement reaction heat recovery device

Abstract

The utility model relates to the field of liquid-phase rearrangement reaction heat recovery, and discloses a liquid-phase rearrangement reaction heat recovery device which comprises a liquid-phase rearrangement reactor (1), a reaction heat collector (3), a heat carrier tank (4), a compressor (6), a heat exchanger (7) and a liquid-phase rearrangement raw material supply unit (10), the reaction cooler (3) comprises a hot side and a cold side, an outlet of the liquid phase rearrangement raw material supply unit (10) is communicated with an inlet of the liquid phase rearrangement reactor (1), a liquid phase outlet of the liquid phase rearrangement reactor (1) is communicated with a hot side inlet of the reaction cooler (3), and a hot side outlet of the reaction cooler (3) is communicated with the liquid phase rearrangement reactor (1). The device can recover reaction heat generated by liquid phase rearrangement reaction and utilize the reaction heat to each heater of the device, so that energy is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of liquid phase rearrangement reaction heat recovery, specifically relates to a liquid phase rearrangement reaction heat recovery device. BACKGROUND

[0002] The liquid phase rearrangement reaction of cyclohexanone oxime is an exothermic reaction for generating caprolactam from cyclohexanone oxime and nicotinic acid, and the reaction heat is about 207 kJ / mol. If this part of reaction heat can be used to heat other process media, the energy consumption and carbon emissions of the device will be greatly reduced, and great economic and social benefits will be generated.

[0003] CN117160063A discloses a device for recovering rearrangement reaction heat of cyclohexanone oxime. The device uses rearrangement circulating liquid to heat the first t-butanol recovery tower. From the temperature level, the heat exchange of the two materials is appropriate, but since the rearrangement device is far away from the first t-butanol recovery tower, the rearrangement circulating liquid has large power consumption, and the circulating liquid is strongly acidic, so long-distance transportation has energy consumption and safety problems.

[0004] Therefore, how to solve the recycling of the reaction heat generated by the liquid phase rearrangement reaction of cyclohexanone oxime is a technical problem that needs to be solved at present. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the problem of difficult recycling of liquid phase rearrangement reaction heat in the prior art, and provides a liquid phase rearrangement reaction heat recovery device. The device can recover the reaction heat generated by the liquid phase rearrangement reaction and utilize it in the heaters of the device, thereby saving energy.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a liquid phase rearrangement reaction heat recovery device, which comprises a liquid phase rearrangement reactor 1, a reaction heat extractor 3, a heat carrier tank 4, a compressor 6, a heat exchanger 7, and a liquid phase rearrangement raw material supply unit 10.

[0007] The reaction heat extractor 3 comprises a hot side and a cold side. The outlet of the liquid phase rearrangement raw material supply unit 10 is communicated with the inlet of the liquid phase rearrangement reactor 1. The liquid phase outlet of the liquid phase rearrangement reactor 1 is communicated with the hot side inlet of the reaction heat extractor 3. The hot side outlet of the reaction heat extractor 3 is communicated with the liquid phase rearrangement reactor 1.

[0008] The liquid phase outlet of the heat carrier tank 4 is communicated with the cold side inlet of the reaction heat extractor 3. The cold side outlet of the reaction heat extractor 3 is communicated with the inlet of the compressor 6. The outlet of the compressor 6 is communicated with the hot side inlet of the heat exchanger 7. The hot side outlet of the heat exchanger 7 is communicated with the inlet of the heat carrier tank 4.

[0009] Optionally, the device further comprises a reaction circulation pump 2, the liquid phase outlet of the liquid phase rearrangement reactor 1 is communicated with the inlet of the reaction circulation pump 2, and the outlet of the reaction circulation pump 2 is communicated with the hot side inlet of the reaction heat exchanger 3.

[0010] Optionally, the device further comprises a heat carrier circulation pump 5, the inlet of the heat carrier circulation pump 5 is communicated with the liquid phase outlet of the heat carrier tank 4, and the outlet of the heat carrier circulation pump 5 is communicated with the cold side inlet of the reaction heat exchanger 3.

[0011] Optionally, a return line is arranged between the outlet and the inlet of the compressor 6, so as to improve the inlet temperature of the compressor 6.

[0012] Optionally, a first heater 9 is arranged between the reaction heat exchanger 3 and the compressor 6, so as to improve the inlet temperature of the compressor 6.

[0013] Optionally, the reaction heat exchanger 3 is connected in parallel with a second heater 11, the inlet of the second heater 11 is communicated with the outlet of the heat carrier circulation pump 5, and the outlet of the second heater 11 is communicated with the inlet of the compressor 6.

[0014] Optionally, the gas phase outlet of the heat carrier tank 4 is communicated with the cold side outlet of the reaction heat exchanger 3, so as to send the gas phase in the heat carrier tank 4 into the compressor 6.

[0015] Optionally, the liquid phase rearrangement raw material supply unit 10 is a cyclohexanone oxime liquid phase rearrangement raw material supply unit, comprising a cyclohexanone oxime supply unit and a fuming sulfuric acid supply unit, and is used for delivering liquid phase rearrangement reaction raw materials to the liquid phase rearrangement reactor 1.

[0016] Optionally, the compressor 6 is a centrifugal compressor and / or a reciprocating compressor.

[0017] Optionally, a gas-liquid separation unit 8 is arranged between the cold side outlet of the reaction heat exchanger 3 and the inlet of the compressor 6.

[0018] Through the above technical scheme, the following beneficial effects are obtained:

[0019] The device provided by the utility model recycles reaction heat generated in liquid phase rearrangement reaction, transmits the reaction heat through a heat carrier, further compresses the gasified heat carrier through a compressor, improves the temperature level of the heat carrier, and supplies the recycled heat to each heater of the device, thereby saving energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the basic schematic view of the liquid phase rearrangement reaction heat recovery device improved by the utility model;

[0021] Figure 2 is the detailed schematic view of the liquid phase rearrangement reaction heat recovery device provided by the utility model.

[0022] Reference Signs List

[0023] 1 - liquid phase rearrangement reactor 2 - reaction circulating pump 3 - reaction heat remover

[0024] 4 - heat carrier tank 5 - heat carrier circulating pump 6 - compressor

[0025] 7 - heat exchanger 8 - gas-liquid separation unit 9 - first heater

[0026] 10 - liquid phase rearrangement raw material supply unit 11 - second heater DETAILED DESCRIPTION

[0027] The endpoints of the ranges and any values disclosed herein are not limited to the precise values recited as the exact dimensions are not critical to the properties. The endpoints of the ranges and the individual values are not to be understood as limited to the precise values recited as the exact dimensions are not critical unless expressly state otherwise. The ranges, endpoints thereof, and individual values thereof, can be combined with one or more other ranges, endpoints and values therefrom, to form new ranges within the scope of the present disclosure.

[0028] In the present application, unless otherwise specified, the orientation words such as "upper", "lower", "left", "right" generally refer to the orientation shown in the drawings. "Inner" and "outer" refer to the inner and outer relative to the outline of each component.

[0029] The utility model provides a kind of liquid phase rearrangement reaction heat recovery device, the device includes: liquid phase rearrangement reactor 1, reaction heat remover 3, heat carrier tank 4, compressor 6, heat exchanger 7, liquid phase rearrangement raw material supply unit 10;

[0030] Wherein, the reaction heat remover 3 includes hot side and cold side, the outlet of the liquid phase rearrangement raw material supply unit 10 is communicated with the inlet of liquid phase rearrangement reactor 1, the liquid phase outlet of the liquid phase rearrangement reactor 1 is communicated with the hot side inlet of reaction heat remover 3, and the hot side outlet of reaction heat remover 3 is communicated with liquid phase rearrangement reactor 1;

[0031] The liquid phase outlet of the heat carrier tank 4 is communicated with the cold side inlet of reaction heat remover 3, the cold side outlet of reaction heat remover 3 is communicated with the inlet of compressor 6, the outlet of compressor 6 is communicated with the hot side inlet of heat exchanger 7, and the hot side outlet of heat exchanger 7 is communicated with the inlet of heat carrier tank 4.

[0032] The utility model provides a kind of liquid phase rearrangement reaction heat recovery device, such as Figure 1As shown, the device utilizes the heat exchange of the liquid phase rearrangement reaction heat release to the heat carrier, and the heat carrier after heat exchange is compressed in the compressor to improve the temperature level of the heat carrier, and the heat is subsequently supplied to other heaters for use, thereby realizing the effective recycling of the liquid phase rearrangement reaction heat, and solving the problem of difficulty in directly taking heat from the liquid phase rearrangement reaction heat.

[0033] According to a preferred embodiment of the utility model, the device further comprises a reaction circulating pump 2, the liquid phase outlet of the liquid phase rearrangement reactor 1 is in communication with the inlet of the reaction circulating pump 2, and the outlet of the reaction circulating pump 2 is in communication with the hot side inlet of the reaction heat extractor 3. The liquid phase rearrangement reaction product is sent into the reaction heat extractor 3 for heat exchange by the reaction circulating pump 2, and the type of the reaction circulating pump is not particularly limited, and a person skilled in the art can select a conventional circulating pump according to the liquid phase rearrangement reaction condition.

[0034] According to a preferred embodiment of the utility model, the liquid phase rearrangement reaction raw material is not particularly limited, and a person skilled in the art can select a conventional liquid phase rearrangement reaction raw material and adjust the liquid phase rearrangement reaction condition, and the liquid phase rearrangement reaction can be realized. Preferably, the liquid phase rearrangement raw material supply unit 10 is a cyclohexanone oxime liquid phase rearrangement raw material supply unit, comprising a cyclohexanone oxime supply unit and a fuming sulfuric acid supply unit, and is used for delivering the liquid phase rearrangement reaction raw material to the liquid phase rearrangement reactor 1.

[0035] According to a preferred embodiment of the utility model, the reaction heat extractor 3 comprises a hot side and a cold side, the liquid phase rearrangement reaction product is introduced into the hot side, and the heat carrier is introduced into the cold side, heat exchange is carried out in the reaction heat extractor 3, and the reaction heat of the liquid phase rearrangement reaction is effectively recycled and utilized.

[0036] According to a preferred embodiment of the utility model, a gas-liquid separation unit 8 is arranged between the cold side outlet of the reaction heat extractor 3 and the inlet of the compressor 6.

[0037] According to a preferred embodiment of the utility model, a return line is arranged between the outlet and the inlet of the compressor 6, and is used for improving the inlet temperature of the compressor 6.

[0038] According to a preferred embodiment of the utility model, a first heater 9 is arranged between the reaction heat extractor 3 and the compressor 6, and is used for improving the inlet temperature of the compressor 6.

[0039] In the utility model, when the gas-liquid separation unit 8 and the first heater 9 are simultaneously arranged in the device, the connection sequence of the gas-liquid separation unit 8 and the first heater 9 is not particularly limited, and according to the flow direction of the heat carrier, the heat carrier can be buffered through the gas-liquid separation unit first and then further gasified through the first heater, or the heat carrier can be first passed through the first heater and then passed through the gas-liquid separation unit to ensure that there is no liquid in the gasified heat carrier.

[0040] According to a preferred embodiment of the utility model, the kind of compressor is not particularly limited, preferably the compressor 6 is centrifugal compressor and / or reciprocating compressor. The person skilled in the art adjusts the compression power and the air extraction capacity of the compressor according to the gasification heat production after the heat exchange of heat carrier, compresses the heat carrier after the heat exchange gasification of reaction heat exchanger 3, improves the temperature level of heat carrier, and supplies heat to each heat exchanger of the device.

[0041] According to a preferred embodiment of the utility model, the device further comprises a heat carrier circulating pump 5, the inlet of the heat carrier circulating pump 5 is communicated with the liquid phase outlet of heat carrier tank 4, and the outlet of heat carrier circulating pump 5 is communicated with the cold side inlet of reaction heat exchanger 3.

[0042] In the utility model, the heat carrier in heat carrier tank 4 is sent into reaction heat exchanger 3 and liquid phase rearrangement reaction product heat exchange through heat carrier circulating pump 5, the kind of heat carrier is not particularly limited, and it is the compression medium that can be applied to compressor in the prior art, preferably the compression medium that is gasified after the heat exchange of reaction heat exchanger 3.

[0043] In the utility model, the optional range of heat carrier is wide, the above-mentioned heat carrier and liquid phase rearrangement reaction product are heat exchanged, the heat carrier is gasified under the action of liquid phase rearrangement reaction heat, effectively transfers the reaction heat of liquid phase rearrangement reaction into heat carrier, and the heat is used in the heat exchanger connected with the outlet of compressor after compression, realizes the recycling of liquid phase rearrangement reaction heat, solves the problem of difficult direct heat extraction and the screening problem of heat carrier.

[0044] According to a preferred embodiment of the utility model, the number of heat exchangers 7 is not particularly limited, and the person skilled in the art can adjust the number of heat exchangers according to the recycling situation of liquid phase rearrangement reaction heat, and the number of heat exchangers is at least 1. The kind of heat exchanger is not particularly limited, and it is the heat exchanger in the prior art, which can be heated by the heat carrier at the outlet of compressor 6.

[0045] According to a preferred embodiment of the utility model, reaction heat exchanger 3 is connected in parallel with second heater 11, the inlet of second heater 11 is communicated with the outlet of heat carrier circulating pump 5, and the outlet of second heater 11 is communicated with the inlet of compressor 6. In the utility model, a second heater 11 is optionally connected in parallel with reaction heat exchanger 3 according to the heat exchange situation of reaction heat exchanger, to ensure the stable operation of reaction heat recovery device.

[0046] According to a preferred embodiment of the utility model, the gas phase outlet of the heat carrier tank 4 is in communication with the cold side outlet of the reaction heat extractor 3, for sending the gas phase in the heat carrier tank 4 into the compressor 6. When the heat carrier is circulated back to the heat carrier tank 4 after heat exchange by the heat exchanger 7, the heat carrier in the heat carrier tank may be gasified due to the decrease of pressure, so the gas phase outlet pipeline of the heat carrier tank 4 is connected with the cold side outlet pipeline of the reaction heat extractor 3, and the small amount of gasified heat carrier enters the compressor 6 through the pipeline, thereby reducing heat consumption.

[0047] According to a preferred embodiment of the utility model, the device shown in Figure 1 and Figure 2 is used to carry out liquid phase rearrangement reaction heat recovery, the liquid phase rearrangement reaction raw material is sent into the liquid phase rearrangement reactor 1 by the liquid phase rearrangement raw material supply unit 10, the liquid phase rearrangement reaction is carried out in the liquid phase rearrangement reactor 1, and the reaction product is sent into the hot side of the reaction heat extractor 3 by the reaction circulating pump 2, and heat exchange is carried out with the heat carrier, and the reaction product after heat exchange is sent into the liquid phase rearrangement reactor 1 through the hot side outlet of the reaction heat extractor 3.

[0048] The heat carrier in the heat carrier tank 4 is sent into the cold side of the reaction heat extractor 3 by the heat carrier circulating pump 5, heat exchange is carried out with the liquid phase rearrangement reaction product on the hot side of the reaction heat extractor 3, the heat carrier after heat exchange is gasified and enters the compressor 6, and after compression by the compressor 6, enters the heat exchanger 7, and the heat is recycled.

[0049] According to some preferred embodiments of the utility model, as shown in Figure 2 , the heat carrier is circulated back to the heat exchanger 7 after heat exchange by the reaction heat extractor 3, gas-liquid separation by the gas-liquid separation unit 8 and heating by the first heater 9, and then enters the compressor 6.

[0050] The utility model will be described in detail through examples and comparative examples. In the following examples and comparative examples, unless otherwise specified, the reagents used in the utility model are commercially available.

[0051] Example 1

[0052] The embodiment provides a device for separating benzene and heavy substances by liquid phase rearrangement reaction heat, as shown in Figure 1 .

[0053] The liquid phase rearrangement reaction raw material is sent to the inlet of the liquid phase rearrangement reactor 1 by the liquid phase rearrangement raw material supply unit 10 to carry out the liquid phase rearrangement reaction, the cyclohexanone oxime is introduced by the cyclohexanone oxime supply unit, the oleum is introduced by the oleum supply unit, the liquid phase outlet of the liquid phase rearrangement reactor 1 is communicated with the inlet of the reaction circulating pump 2, the outlet of the reaction circulating pump 2 is communicated with the hot side inlet of the reaction heat exchanger 3, the hot side outlet of the reaction heat exchanger 3 is communicated with the liquid phase rearrangement reactor 1, and the reaction product after the liquid phase rearrangement reaction is sent to the reaction heat exchanger 3 to exchange heat with the heat carrier by the reaction circulating pump 2, and the liquid phase rearrangement reaction product after the heat exchange is introduced into the liquid phase rearrangement reactor 1 through the hot side outlet of the reaction heat exchanger 3.

[0054] The liquid phase outlet of the heat carrier tank 4 is communicated with the inlet of the heat carrier circulating pump 5, the outlet of the heat carrier circulating pump 5 is communicated with the cold side inlet of the reaction heat exchanger 3, the heat carrier is sent to the cold side of the reaction heat exchanger 3 by the heat carrier circulating pump 5 to exchange heat, the cold side outlet of the reaction heat exchanger 3 is communicated with the inlet of the compressor 6, the heat carrier after the heat exchange is introduced into the compressor 6 to be compressed, the outlet of the compressor 6 is communicated with the hot side inlet of the heat exchanger 7, the hot side outlet of the heat exchanger 7 is communicated with the inlet of the heat carrier tank 4, the heat exchanger 7 is a benzene tower reboiler, and the heat carrier after the heat exchange through the heat exchanger 7 returns to the heat carrier tank 4 to circulate.

[0055] The benzene tower feed quantity is 100t / h, the mass fractions of benzene and heavy substances are 98wt% and 2wt% respectively, the overhead discharge is benzene, and the bottom discharge is a heavy substance concentrated solution. The benzene tower operating pressure is slightly positive, the bottom temperature is 90-95℃, the heat carrier feed quantity of the reboiler is 112t / h, and the discharge temperature is 120℃.

[0056] The preferred embodiments of the utility model are described in detail above, but the utility model is not limited to this. Within the technical concept range of the utility model, the technical scheme of the utility model can be subjected to various simple modifications, including various technical features being combined in any other suitable mode, and these simple modifications and combinations should also be regarded as the disclosed content of the utility model and belong to the protection range of the utility model.

Claims

1. A liquid-phase rearrangement reaction heat recovery device, characterized in that, The device includes: a liquid phase rearrangement reactor (1), a reaction heat exchanger (3), a heat carrier tank (4), a compressor (6), a heat exchanger (7), and a liquid phase rearrangement raw material supply unit (10); The reaction heat exchanger (3) includes a hot side and a cold side. The outlet of the liquid phase rearrangement raw material supply unit (10) is connected to the inlet of the liquid phase rearrangement reactor (1). The liquid phase outlet of the liquid phase rearrangement reactor (1) is connected to the hot side inlet of the reaction heat exchanger (3). The hot side outlet of the reaction heat exchanger (3) is connected to the liquid phase rearrangement reactor (1). The liquid phase outlet of the heat carrier tank (4) is connected to the cold side inlet of the reaction heat exchanger (3), the cold side outlet of the reaction heat exchanger (3) is connected to the inlet of the compressor (6), the outlet of the compressor (6) is connected to the hot side inlet of the heat exchanger (7), and the hot side outlet of the heat exchanger (7) is connected to the inlet of the heat carrier tank (4).

2. The apparatus according to claim 1, characterized in that, The device also includes a reaction circulation pump (2), the liquid phase outlet of the liquid phase rearrangement reactor (1) is connected to the inlet of the reaction circulation pump (2), and the outlet of the reaction circulation pump (2) is connected to the hot side inlet of the reaction heat exchanger (3).

3. The apparatus according to claim 1, characterized in that, The device also includes a heat carrier circulation pump (5), the inlet of which is connected to the liquid phase outlet of the heat carrier tank (4), and the outlet of which is connected to the cold side inlet of the reaction heat exchanger (3).

4. The apparatus according to claim 1, characterized in that, A return line is provided between the outlet and inlet of the compressor (6) to increase the inlet temperature of the compressor (6).

5. The apparatus according to claim 1, characterized in that, A first heater (9) is provided between the reaction heat exchanger (3) and the compressor (6) to increase the inlet temperature of the compressor (6).

6. The apparatus according to claim 1, characterized in that, The reaction heat exchanger (3) is connected in parallel with a second heater (11). The inlet of the second heater (11) is connected to the outlet of the heat carrier circulation pump (5), and the outlet of the second heater (11) is connected to the inlet of the compressor (6).

7. The apparatus according to claim 1, characterized in that, The gas phase outlet of the heat carrier tank (4) is connected to the cold side outlet of the reaction heat exchanger (3) to send the gas phase in the heat carrier tank (4) into the compressor (6).

8. The apparatus according to claim 1, characterized in that, The liquid phase rearrangement feedstock supply unit (10) is a cyclohexanone oxime liquid phase rearrangement feedstock supply unit, including a cyclohexanone oxime supply unit and a fuming sulfuric acid supply unit, used to supply liquid phase rearrangement reaction feedstock to the liquid phase rearrangement reactor (1).

9. The apparatus according to claim 1, characterized in that, The compressor (6) is a centrifugal compressor and / or a reciprocating compressor.

10. The apparatus according to claim 1, characterized in that, A gas-liquid separation unit (8) is provided between the cold side outlet of the reaction heat exchanger (3) and the inlet of the compressor (6).

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