CN219567624U - Device for reducing waste water in cyclohexanol production process - Google Patents
Device for reducing waste water in cyclohexanol production process Download PDFInfo
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- CN219567624U CN219567624U CN202223500520.8U CN202223500520U CN219567624U CN 219567624 U CN219567624 U CN 219567624U CN 202223500520 U CN202223500520 U CN 202223500520U CN 219567624 U CN219567624 U CN 219567624U
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Abstract
The utility model provides a device for reducing wastewater in a cyclohexanol production process, which comprises a catalyst washing device, wherein a filtrate recovery device is arranged at the wastewater output end of the catalyst washing device, and the filtrate recovery device is connected to a high-purity water heater or a wastewater treatment device of the catalyst washing device. According to the utility model, the filtrate recovery device is arranged at the tail end of the catalyst washing device, so that the waste water can be recovered and reused, the external reboiler is added to the waste water stripping tower, the steam can be recovered, and the waste water amount can be greatly reduced.
Description
Technical Field
The utility model relates to the technical field related to cyclohexanol treatment devices, in particular to a device for reducing waste water in a cyclohexanol production process.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The main process flow of the method is that benzene is partially hydrogenated to generate cyclohexene, cyclohexane and unreacted benzene, then the benzene, the cyclohexene and the cyclohexane are separated through rectification, the separated cyclohexene is subjected to hydration reaction to prepare cyclohexanol, and then the product cyclohexanol is obtained through rectification.
The inventor found in the research that during the hydration reaction, the catalyst slurry needs to be regenerated, and after the catalyst slurry is oxidized by hydrogen peroxide, the organic acid compound remains in the slurry, so that the slurry needs to be circulated through a filter, a large amount of high-purity water is used for washing and filtering to remove the organic acid compound, and the filtrate after washing and filtering is discharged into a wastewater treatment section after the PH value of the filtrate is adjusted by adding sodium hydroxide, and a large amount of wastewater is generated in the process, so that the catalyst slurry is one of the main sources of the wastewater of a cyclohexanol device. Taking a 20 ten thousand ton/year cyclohexanol plant as an example, the amount of waste water here is about 10t/h.
And finally, recovering organic matters in the oily wastewater generated by the cyclohexanol device through a wastewater stripping tower, and ensuring that the content of the organic matters in the discharged wastewater reaches the standard. The principle of the waste water stripping tower is that oily waste water is directly contacted with steam, so that volatile organic compounds in the waste water are diffused into a gas phase according to a certain proportion, and the aim of separating organic compounds from the waste water is fulfilled. In the treatment process of the wastewater stripping tower, the wastewater discharged from the tower kettle comprises steam and sewage in the raw oil-containing wastewater due to the direct contact of the steam and the wastewater, and the total amount of the discharged wastewater is increased due to the direct addition of the steam. Taking a 20 ten thousand ton/year cyclohexanol device as an example, the wastewater treatment tower needs about 5t/h steam to separate most of organic matters in wastewater, so about 5t/h steam enters a wastewater cooler along with wastewater at the tower kettle to be cooled and then is sent to the wastewater treatment device. Due to the increase of the wastewater quantity, more electric energy is required to be consumed for conveying the wastewater, and more cooling water is required to be consumed for cooling the wastewater, so that the cooling water consumption is increased.
Disclosure of Invention
The utility model aims to solve the problems, and provides a device for reducing waste water in the cyclohexanol production process, which can greatly reduce the waste water amount generated in the cyclohexanol production process.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
one or more embodiments provide an apparatus for reducing wastewater in a cyclohexanol production process, comprising a catalyst water washing device, wherein a wastewater output end of the catalyst water washing device is provided with a filtrate recovery device, and the filtrate recovery device is connected to a high-purity water heater or a wastewater treatment device of the catalyst water washing device.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, the filtrate recovery device is arranged at the tail end of the catalyst washing device, so that the waste water can be recovered and reused, the external reboiler is added to the waste water stripping tower, the steam can be recovered, and the waste water amount can be greatly reduced.
The advantages of the present utility model, as well as those of additional aspects, will be described in detail in the following detailed examples.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
FIG. 1 is a schematic view of a catalyst wash apparatus modified in accordance with an embodiment of the present utility model;
FIG. 2 is a first schematic view of a wastewater treatment plant according to an embodiment of the present utility model;
FIG. 3 is a second schematic view of the construction of the wastewater treatment apparatus according to the embodiment of the present utility model;
wherein: 1. the device comprises a water washing tank, 2 parts of a water washing pump, 3 parts of a filter, 4 parts of a high-purity water heater, 5 parts of a high-purity water cooler, 6 parts of a filtrate recovery tank, 7 parts of a filtrate recovery pump, 8 parts of a wastewater stripping tower, 9 parts of a wastewater stripping tower reboiler, 10 parts of a wastewater pump, 11 parts of a wastewater cooler.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In one or more embodiments, as shown in fig. 1-3, an apparatus for reducing wastewater in a cyclohexanol production process includes a catalyst water washing apparatus, wherein a wastewater output end of the catalyst water washing apparatus is provided with a filtrate recovery apparatus, and the filtrate recovery apparatus is connected to a high purity water heater 4 or a wastewater treatment apparatus of the catalyst water washing apparatus.
In this embodiment, the end of catalyst washing device sets up filtrate recovery unit, can make partial water cyclic utilization, reduces fresh desalted water use amount, reduces the waste water use amount simultaneously, can significantly reduce the waste water volume.
Further technical scheme, filtrate recovery unit is including the filtrate recovery tank 6 and the filtrate recovery pump 7 that connect gradually to and set up the water quality testing device before filtrate recovery pump 7.
Optionally, the water quality detection device comprises an organic acid concentration detection sensor and a detection controller. The organic acid concentration detection sensor may be provided in the filtrate recovery tank 6, or on a pipe between the filtrate recovery tank 6 and the filtrate recovery pump 7.
The organic acid concentration detection sensor can detect the water quality condition of the wastewater output by the catalyst washing device, specifically detect the water quality containing the organic acid concentration, and can be an on-line PH meter;
the detection controller is controlled to be connected with the high-purity water heater 4 or the external waste water main pipe according to the detected water quality containing the organic acid concentration, if the water quality containing the organic acid concentration is lower, the water returns to the high-purity water heater 4, and the water is circularly used after being heated by the high-purity water heater 4, and if the water quality containing the organic acid concentration is higher, the water is connected to the waste water treatment device. The model of the detection controller can be STC15W201S series single-chip microcomputer.
The utility model provides a structure that can realize, filtrate recovery tank 6 of filtrate recovery unit is connected to catalyst washing device's high-purity water heater 4 through first solenoid valve, filtrate recovery pump 7, and filtrate recovery tank 6 is connected to effluent treatment plant through the second solenoid valve, first solenoid valve, second solenoid valve respectively with detection controller communication connection, through the break-make of detection controller control first solenoid valve, second solenoid valve. The type of the electromagnetic valve can adopt ZJHP-16P.
Alternatively, the two solenoid valves may be three-way valves. The output of filtrate recovery unit filtrate recovery tank 6 is connected and is set up the three-way valve, and one of them output of three-way valve connects gradually filtrate recovery pump 7 and high-purity water heater 4, and the other output of three-way valve is connected to effluent treatment plant, and three-way valve and detection controller communication connection control three-way valve's break-make through the detection controller.
In some embodiments, the catalyst washing device comprises a washing tank 1, a washing pump 2, a filter 3 and a cooling device which are connected in sequence, wherein the output end of the filter 3 is connected to the washing tank 1 and the cooling device respectively; the water heater also comprises a high-purity water heater 4, the steam output end of the high-purity water heater 4 is connected to the lower end of the filter 3, and the output end of the cooling device is the wastewater output end of the catalyst washing device.
Specifically, the cooling device is a cooler 5.
In this embodiment, in order to reduce the discharge amount of wastewater, a filtrate recovery device is provided, and a catalyst water washing device cooling device is connected to a filtrate recovery tank 6 of the filtrate recovery device.
In the water washing process, the catalyst slurry containing the organic acid compound is first introduced into the water washing tank 1, and then pressurized by the water washing pump 2 and then introduced into the top of the filter 3. The high-purity water enters the lower part of the side surface of the filter 3 after being heated by the high-purity water heater 4, and the high-purity water and catalyst slurry are in countercurrent contact in the filter 3, wherein organic acid compounds in the catalyst slurry are dissolved into water, and then the wastewater enters the high-purity water cooler 5 after coming out of the upper part of the side surface of the filter 3, is cooled and is sent into the wastewater stripper. The filtered catalyst slurry returns to the water washing tank 1, and the catalyst slurry circularly enters the filter 3 for filtration for a plurality of times, and is sent to the next working procedure through the water washing pump 2 after being qualified.
After improvement, after the organic acid compound in the catalyst slurry in the filter 3 is dissolved into water, the wastewater enters the high-purity water cooler 5 to be cooled after coming out from the upper part of the side surface of the filter 3, and then is sent into the filtrate recovery tank 6, and is pressurized by the filtrate recovery pump 7, and according to the water quality characteristics of the water, the wastewater returns to the high-purity water heater 4 if the water quality contains low organic acid concentration, is circularly used after being heated by the high-purity water heater 4, and is transmitted to the wastewater treatment device if the water quality contains high organic acid concentration.
In the embodiment, the filtrate recovery tank 6 and the filtrate recovery pump 7 are additionally arranged, so that the wastewater recycling method can reduce the wastewater volume by about 30%, and greatly reduce the wastewater discharge. Meanwhile, the treatment capacity of the waste water stripping tower is reduced, and the energy consumption and the waste water discharge capacity of the treatment device at the rear end are reduced.
In some embodiments, as shown in fig. 2, the wastewater treatment device may include a wastewater stripping tower 8, a wastewater pump 10 and a wastewater cooler 11 which are sequentially connected, the wastewater stripping tower 8 is further connected with a low-pressure steam supply device, and low-pressure steam in the wastewater stripping tower 8 contacts with wastewater to diffuse volatile organic matters in the wastewater into a gas phase according to a certain proportion, so that extraction of organic matters in the wastewater can be realized.
The wastewater treatment process comprises the following steps: the wastewater at about 40 ℃ enters a wastewater stripping tower 8, low-pressure steam at about 120 ℃ is directly introduced into the tower kettle, volatile organic compounds in the wastewater are diffused into a gas phase according to a certain proportion through direct contact of the wastewater and the steam, the wastewater is discharged from the top of the wastewater stripping tower 8, the wastewater containing a very small amount of organic compounds is extracted from the tower kettle, pressurized by a wastewater pump 10, enters a wastewater cooler 11, is cooled to 40 ℃ and is sent to a device for wastewater treatment in the next link.
As a further improvement, as shown in fig. 3, a waste water stripper reboiler 9 is also provided, the waste water stripper reboiler 9 is arranged outside the tower and is connected with the tower through a pipeline, and the waste water stripper reboiler 9 belongs to an external reboiler.
The low-pressure steam enters the waste water stripping tower reboiler 9 to be indirectly heated to separate the oil-containing waste water, so that the amount of waste water discharged outside is reduced, and the low-pressure steam condensate returns to a condensate system to be recycled, so that the method is significant in environmental protection and economy.
As shown in fig. 3, the process of organic extraction: the wastewater at about 40 ℃ enters a wastewater stripping tower 8, a new wastewater stripping tower reboiler 9 is added, low-pressure steam at about 150 ℃ enters the wastewater stripping tower reboiler 9, organic matters in the wastewater enter a tower top gas phase through indirect heating, the organic matters are discharged from the tower top of the wastewater stripping tower 8, the wastewater containing a small amount of organic matters is extracted from a tower kettle, pressurized by a wastewater pump 10, enters a wastewater cooler 11, is cooled to 40 ℃ and is sent to a wastewater treatment device. The low-pressure steam condensate generated after the low-pressure steam is subjected to heat exchange enters a condensate pipe network for recycling, and does not enter the waste water of the tower kettle any more, so that the waste water discharge amount outside the tower kettle is reduced.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.
Claims (7)
1. A device for reducing waste water in the cyclohexanol production process, which is characterized in that: the device comprises a catalyst washing device, wherein a filtrate recovery device is arranged at the wastewater output end of the catalyst washing device, and the filtrate recovery device is connected to a high-purity water heater or a wastewater treatment device of the catalyst washing device;
the filtrate recovery device comprises a filtrate recovery tank and a filtrate recovery pump which are connected in sequence, and a water quality detection device arranged in front of the filtrate recovery pump;
the filtrate recovery tank of the filtrate recovery device is connected to the high-purity water heater of the catalyst washing device through a first electromagnetic valve and a filtrate recovery pump, the filtrate recovery tank is connected to the wastewater treatment device through a second electromagnetic valve, and the first electromagnetic valve and the second electromagnetic valve are respectively in communication connection with the detection controller;
the output of filtrate recovery unit filtrate recovery tank is connected and is set up the three-way valve, and one of them output of three-way valve connects gradually filtrate recovery pump and high-purity water heater, and another output of three-way valve is connected to effluent treatment plant, three-way valve and detection controller communication connection.
2. An apparatus for reducing wastewater from a cyclohexanol production process as defined in claim 1 wherein: the water quality detection device comprises an organic acid concentration detection sensor and a detection controller.
3. An apparatus for reducing wastewater from a cyclohexanol production process as defined in claim 2 wherein: the organic acid concentration detection sensor is arranged in the filtrate recovery tank.
4. An apparatus for reducing wastewater from a cyclohexanol production process as defined in claim 2 wherein: the organic acid concentration detection sensor is arranged on a pipeline between the filtrate recovery tank and the filtrate recovery pump.
5. An apparatus for reducing wastewater from a cyclohexanol production process as defined in claim 1 wherein: the catalyst washing device comprises a washing tank, a washing pump, a filter and a cooling device which are connected in sequence, wherein the output end of the filter is connected to the washing tank and the cooling device respectively; the device also comprises a high-purity water heater, wherein the steam output end of the high-purity water heater is connected to the filter, and the output end of the cooling device is the wastewater output end of the catalyst washing device.
6. An apparatus for reducing wastewater from a cyclohexanol production process as defined in claim 1 wherein: the waste water treatment device comprises a waste water stripping tower, a waste water pump and a waste water cooler which are sequentially connected, wherein the waste water stripping tower is also connected with a low-pressure steam supply device, and low-pressure steam in the waste water stripping tower is contacted with waste water.
7. An apparatus for reducing wastewater from a cyclohexanol production process as defined in claim 1 wherein: the device is also provided with a waste water stripping tower reboiler, and the waste water stripping tower reboiler is arranged outside the waste water stripping tower and is connected with the waste water stripping tower through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223500520.8U CN219567624U (en) | 2022-12-16 | 2022-12-16 | Device for reducing waste water in cyclohexanol production process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223500520.8U CN219567624U (en) | 2022-12-16 | 2022-12-16 | Device for reducing waste water in cyclohexanol production process |
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| CN219567624U true CN219567624U (en) | 2023-08-22 |
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| CN202223500520.8U Active CN219567624U (en) | 2022-12-16 | 2022-12-16 | Device for reducing waste water in cyclohexanol production process |
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