CN221093985U - Device for recycling crude phenol from semi-coke wastewater and refining crude phenol - Google Patents
Device for recycling crude phenol from semi-coke wastewater and refining crude phenol Download PDFInfo
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- CN221093985U CN221093985U CN202322959969.9U CN202322959969U CN221093985U CN 221093985 U CN221093985 U CN 221093985U CN 202322959969 U CN202322959969 U CN 202322959969U CN 221093985 U CN221093985 U CN 221093985U
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 title claims abstract description 261
- 238000007670 refining Methods 0.000 title claims abstract description 64
- 239000002351 wastewater Substances 0.000 title claims abstract description 36
- 239000000571 coke Substances 0.000 title claims abstract description 21
- 238000004064 recycling Methods 0.000 title claims description 9
- 238000010992 reflux Methods 0.000 claims abstract description 157
- 238000000926 separation method Methods 0.000 claims abstract description 36
- 238000000605 extraction Methods 0.000 claims abstract description 33
- 239000002904 solvent Substances 0.000 claims abstract description 24
- 238000009833 condensation Methods 0.000 claims abstract description 18
- 230000005494 condensation Effects 0.000 claims abstract description 18
- 239000000284 extract Substances 0.000 claims abstract description 10
- QWVGKYWNOKOFNN-UHFFFAOYSA-N o-cresol Chemical compound CC1=CC=CC=C1O QWVGKYWNOKOFNN-UHFFFAOYSA-N 0.000 claims description 42
- 238000007599 discharging Methods 0.000 claims description 33
- 239000007788 liquid Substances 0.000 claims description 23
- RLSSMJSEOOYNOY-UHFFFAOYSA-N m-cresol Chemical compound CC1=CC=CC(O)=C1 RLSSMJSEOOYNOY-UHFFFAOYSA-N 0.000 claims description 14
- 125000002256 xylenyl group Chemical class C1(C(C=CC=C1)C)(C)* 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 7
- 239000000047 product Substances 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 6
- 150000002989 phenols Chemical class 0.000 description 6
- 238000009835 boiling Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 150000003738 xylenes Chemical class 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model relates to a device for recovering and refining crude phenol from semi-coke wastewater, which comprises an extraction tower, a crude phenol pretreatment tower, a crude phenol refining tower, a phenol rectifying tower and a separation tower which are connected in sequence, wherein the upper part of the extraction tower is provided with a wastewater inlet, the top is provided with an extract outlet, the bottom is provided with an extractant inlet, and the extract outlet is connected with a phenol extraction feed inlet at the upper part of the crude phenol pretreatment tower; the top of the crude phenol pretreatment tower is provided with a solvent outlet, and the bottom of the crude phenol pretreatment tower is provided with a crude phenol outlet; the crude phenol outlet is connected with a crude phenol feed inlet at the middle lower part of the crude phenol refining tower; the upper part of the crude phenol refining tower is provided with a refined phenol outlet and is connected with a refined phenol feed inlet at the middle upper part of the phenol rectifying tower through a pipeline, and the top of the crude phenol refining tower is connected with a first condensation reflux unit; the upper part of the phenol rectifying tower is provided with a phenol outlet, the bottom is provided with a mixed phenol outlet, and the top is connected with a second condensation reflux unit; the mixed phenol outlet is connected with a mixed phenol feed inlet at the middle lower part of the separation tower; the top of the separation tower is connected with a third condensing reflux unit, the middle part of the separation tower is provided with a first outlet, and the bottom of the separation tower is provided with a second outlet.
Description
Technical Field
The utility model belongs to the technical field of recycling of resource substances in sewage, and particularly relates to a device for recycling and refining crude phenol from semi-coke wastewater.
Background
The semi-coke wastewater contains high-concentration phenolic compounds, which are difficult to biochemically degrade and reach the standard by only biochemical treatment, and currently, advanced oxidation treatment is used, an oxidant is added, and the refractory substances react to generate short-chain or low-molecular-weight substances, so that the biodegradability is improved, and the biochemical treatment is performed. However, phenols are important organic chemical intermediates and chemical basic materials, and have wide application in industries such as medicine, fuel and the like. Therefore, the recycling of the semi-coke wastewater to recover the crude phenol and the preparation of the refined phenol have important economic values. At present, 7 towers or 8 towers are adopted for recycling phenols from semi-coke wastewater and refining crude phenol to produce phenol products, and the problems of long production process, high energy consumption, unstable phenol product quality, high equipment investment, poor device operation stability and the like exist.
Disclosure of utility model
The utility model aims to solve the technical problems that: at present, 7 towers or 8 towers are generally adopted for refining and producing phenolic products from crude phenol, and the production process is long and the energy consumption is high.
Aiming at the problems, the utility model provides a device for recycling and refining crude phenol from semi-coke wastewater, which comprises an extraction tower, a crude phenol pretreatment tower, a crude phenol refining tower, a phenol rectifying tower and a separation tower which are connected in sequence, wherein the upper part of the extraction tower is provided with a wastewater inlet, the top is provided with an extract outlet, the bottom is provided with an extractant inlet, the extract outlet is connected with a phenol extraction feed inlet at the upper part of the crude phenol pretreatment tower, and the device is used for inputting a phenol-containing extractant obtained by extraction into the crude phenol pretreatment tower;
The top of the crude phenol pretreatment tower is provided with a solvent outlet, and the bottom of the crude phenol pretreatment tower is provided with a crude phenol outlet which is respectively used for discharging the extractant and the crude phenol obtained by separation; the crude phenol outlet is connected with a crude phenol feed inlet of the crude phenol refining tower;
The middle lower part of the crude phenol refining tower is provided with a crude phenol feed inlet, the upper part of the crude phenol refining tower is provided with a refined phenol outlet, the refined phenol outlet is connected with the refined phenol feed inlet at the middle upper part of the phenol rectifying tower through a pipeline, and the top of the crude phenol refining tower is connected with a first condensation reflux unit for discharging light components separated from the crude phenol; discharging the separated heavy components from the bottom of the crude phenol refining tower;
The upper part of the phenol rectifying tower is provided with a phenol outlet, and the bottom is provided with a mixed phenol outlet which is respectively used for discharging the separated phenol and mixed phenol; the mixed phenol outlet is connected with a mixed phenol feed inlet at the middle lower part of the separation tower through a pipeline; the top of the phenol rectifying tower is connected with a second condensing reflux unit for discharging light components separated from refined phenol;
the top of the separation tower is connected with a third condensing reflux unit for discharging the o-cresol separated from the mixed phenol; the middle part of the separation tower is provided with a first outlet, and the bottom is provided with a second outlet which is respectively used for discharging the m-cresol and the xylenol which are obtained by separation.
Optionally, a waste water outlet is arranged at the bottom of the extraction tower and is used for discharging the waste water after removing the crude phenol, and the waste water is treated separately or biochemically.
Optionally, a phenol extraction reflux port is arranged at the bottom of the crude phenol pretreatment tower, a solvent reflux port is arranged at the upper part of the crude phenol pretreatment tower, the crude phenol outlet is connected with the crude phenol refining tower and the crude phenol pretreatment tower reboiler in parallel, and the outlet of the crude phenol pretreatment tower reboiler is connected with the phenol extraction reflux port to reflux part of crude phenol into the crude phenol pretreatment tower; the solvent outlet is sequentially connected with the solvent condenser and the solvent tank, and the outlet of the solvent tank is connected with the extractant inlet and the solvent reflux port of the extraction tower in parallel.
Optionally, the top of crude phenol refining tower is equipped with first light component export and first tower top reflux mouth, and the bottom is equipped with heavy component export and first tower cauldron reflux mouth, and the heavy component export connects gradually scraper filter and screw pump, and the export of screw pump connects in parallel first reboiler and heavy component jar, and the export of first reboiler is connected first tower cauldron reflux mouth for form the bottom backward flow and discharge partial heavy component material.
Optionally, the first light component outlet is connected with a first condensation reflux unit, the first condensation reflux unit comprises a first condenser, a first reflux tank and a first reflux pump which are sequentially connected, a gas outlet of the first reflux tank is connected with a non-condensable pipeline, and a liquid outlet is connected with the first tower top reflux port and the light component tank in parallel through the first reflux pump.
Optionally, the top of the phenol rectifying tower is provided with a second light component outlet and a second tower top reflux port, the bottom of the phenol rectifying tower is provided with a second tower kettle reflux port, the phenol mixing outlet is connected with a phenol mixing pump and a second reboiler in parallel, and the outlet of the second reboiler is connected with the second tower kettle reflux port and is used for forming tower bottom reflux and discharging part of phenol mixing.
Optionally, the second light component outlet is connected with a second condensation reflux unit, the second condensation reflux unit comprises a second condenser, a second reflux tank and a second reflux pump which are sequentially connected, a gas outlet of the second reflux tank is connected with a non-condensable pipeline, and a liquid outlet is connected with a second tower top reflux port and a circulating reflux port at the upper part of the crude phenol refining tower in parallel through the second reflux pump;
And discharging the light components separated from the phenol rectifying tower from a second light component outlet, condensing by a second condenser, allowing the liquid to enter a second reflux tank, discharging non-condensable gas in the second reflux tank into a non-condensable gas pipeline, performing another treatment, allowing the liquid in the second reflux tank to flow back to the top of the phenol rectifying tower by a second reflux pump, and allowing the liquid to flow back to the crude phenol rectifying tower.
Optionally, the top of the separation tower is provided with an o-cresol outlet and a third tower top reflux port, the tower bottom is provided with a third tower kettle reflux port, the second outlet is connected with a xylenol pump and a third reboiler in parallel, and the outlet of the third reboiler is connected with the third tower kettle reflux port and is used for forming tower bottom reflux and discharging part of xylenol.
Optionally, the o-cresol outlet is connected with a third condensation reflux unit, the third condensation reflux unit comprises a third condenser, a third reflux tank and a third reflux pump which are sequentially connected, a gas outlet of the third reflux tank is connected with a non-condensable pipeline, and a liquid outlet is connected with a third tower top reflux port and the o-cresol tank in parallel through the third reflux pump.
The device for recycling and refining the crude phenol from the semi-coke wastewater has the following beneficial effects:
(1) The device is integrally provided with only five towers, equipment and flow are greatly shortened, energy consumption is reduced, crude phenol can be extracted from semi-coke wastewater, and then the crude phenol is refined and separated to obtain phenol, o-cresol, m-cresol and xylenol;
(2) The crude phenol refining tower simultaneously removes water, light components and heavy components in crude phenol, replaces the traditional refining process of a two-tower mode (a light component removing tower and a heavy component removing tower) or a three-tower mode (a dehydrating tower, a light component removing tower and a heavy component removing tower), shortens the crude phenol refining process, reduces equipment investment and reduces the energy consumption of a crude phenol refining part;
(3) The separation tower separates the mixed phenol to obtain o-cresol, m-cresol and xylenol, replaces the traditional two-tower separation rectification (an o-cresol tower and an m-cresol tower), shortens the process of separating the mixed phenol, reduces the equipment investment and reduces the energy consumption.
Drawings
FIG. 1 is a schematic diagram of the apparatus for recovering crude phenol from semi-coke wastewater and refining.
In the drawing, a 1-extraction tower, a 2-crude phenol pretreatment tower, a 3-crude phenol refining tower, a 4-phenol rectifying tower, a 5-separation tower, a 6-wastewater inlet, a 7-extract outlet, an 8-extractant inlet, a 9-wastewater outlet, a 10-solvent outlet, a 11-crude phenol outlet, a 12-phenol extraction feed inlet, a 13-solvent reflux inlet, a 14-crude phenol pretreatment tower reboiler, a 15-phenol extraction reflux inlet, a 16-crude phenol feed inlet, a 17-refined phenol outlet, a 18-first light component outlet, a 19-first tower top reflux inlet, a 20-heavy component outlet, a 21-first tower kettle reflux inlet, a 22-scraper filter, 23-screw pump, 24-first reboiler, 25-first reflux drum, 26-noncondensable gas pipeline, 27-phenol outlet, 28-mixed phenol outlet, 29-refined phenol feed inlet, 30-second light component outlet, 31-second tower top reflux inlet, 32-second tower kettle reflux inlet, 33-second reboiler, 34-second reflux drum, 35-circulation reflux inlet, 36-mixed phenol feed inlet, 37-first outlet, 38-second outlet, 39-o-cresol outlet, 40-third tower top reflux inlet, 41-third tower kettle reflux inlet, 42-third reboiler, 43-third reflux drum.
Detailed Description
The embodiment provides a device for recovering and refining crude phenol from semi-coke wastewater, which comprises an extraction tower 1, a crude phenol pretreatment tower 2, a crude phenol refining tower 3, a phenol rectifying tower 4 and a separation tower 5 which are sequentially connected, wherein the upper part of the extraction tower 1 is provided with a wastewater inlet 6, the top is provided with an extract outlet 7, the bottom is provided with an extractant inlet 8, the extract outlet 7 is connected with a phenol extraction feed inlet 12 at the upper part of the crude phenol pretreatment tower 2, and is used for inputting a phenol-containing extractant obtained by extraction into the crude phenol pretreatment tower 2;
The top of the crude phenol pretreatment tower 2 is provided with a solvent outlet 10, and the bottom is provided with a crude phenol outlet 11 which is respectively used for discharging the extractant and the crude phenol obtained by separation; the crude phenol outlet 11 is connected with a crude phenol feed inlet 16 of the crude phenol refining tower 3;
The middle lower part of the crude phenol refining tower 3 is provided with a crude phenol feed inlet 16, the upper part is provided with a refined phenol outlet 17, the refined phenol outlet 17 is connected with a refined phenol feed inlet 29 at the middle upper part of the phenol rectifying tower 4 through a pipeline, and the top of the crude phenol refining tower 3 is connected with a first condensation reflux unit for discharging light components separated from the crude phenol; the separated heavy components are discharged from the bottom of the crude phenol refining tower 3;
The upper part of the phenol rectifying tower 4 is provided with a phenol outlet 27, and the bottom part is provided with a mixed phenol outlet 28 which is respectively used for discharging the separated phenol and mixed phenol; the mixed phenol outlet 28 is connected with a mixed phenol feed port 36 at the middle lower part of the separation tower 5 through a pipeline; the top of the phenol rectifying tower 4 is connected with a second condensing reflux unit for discharging light components separated from refined phenol;
The top of the separation tower 5 is connected with a third condensing reflux unit for discharging the o-cresol separated from the mixed phenol; the middle part of the separation tower 5 is provided with a first outlet 37, and the bottom part is provided with a second outlet 38 for discharging the m-cresol and xylenol obtained by separation.
The extraction tower 1, the crude phenol refining tower 3, the phenol rectifying tower 4 and the separation tower 5 are all filled towers, and the crude phenol pretreatment tower 2 is in the form of tower plates.
Optionally, a waste water outlet 9 is arranged at the bottom of the extraction tower 1 and is used for discharging waste water after removing crude phenol, and the waste water is treated separately or biochemically. The semi-coke wastewater is in countercurrent contact with an extracting agent in an extraction tower 1, crude phenol in the wastewater is extracted, and the extracting agent containing phenol is discharged from the top of the tower.
Optionally, a phenol extraction reflux port 15 is arranged at the bottom of the crude phenol pretreatment tower 2, a solvent reflux port 13 is arranged at the upper part of the crude phenol pretreatment tower, the crude phenol outlet 11 is connected with the crude phenol refining tower 3 and the crude phenol pretreatment tower reboiler 14 in parallel, and the outlet of the crude phenol pretreatment tower reboiler 14 is connected with the phenol extraction reflux port 15 to reflux part of crude phenol into the crude phenol pretreatment tower 2; the solvent outlet 10 is sequentially connected with a solvent condenser and a solvent tank, and the outlet of the solvent tank is connected with the extractant inlet 8 and the solvent reflux port 13 of the extraction tower 1 in parallel.
The phenol-containing extractant is input into a crude phenol pretreatment tower 2, is in countercurrent contact with the reflux liquid at the bottom of the tower, and is separated from the crude phenol and the extractant, and the extractant can be recycled and reused in the extraction tower 1.
Optionally, a first light component outlet 18 and a first tower top reflux port 19 are arranged at the top of the crude phenol refining tower 3, a heavy component outlet 20 and a first tower kettle reflux port 21 are arranged at the bottom of the crude phenol refining tower, the heavy component outlet 20 is sequentially connected with a scraper filter 22 and a screw pump 23, an outlet of the screw pump 23 is connected with a first reboiler 24 and a heavy component tank in parallel, and an outlet of the first reboiler 24 is connected with the first tower kettle reflux port 21 for forming tower bottom reflux and discharging part of heavy component substances.
The tower bottom medium (heavy components and oil residues) of the crude phenol refining tower 3 enters a scraper filter 22, solid particles (oil residues) are intercepted on a filter screen, and after the pressure difference of the scraper filter 22 is increased, the automatic cleaning is performed to drain the oil residues. The filtered still liquid is fed into a screw pump 23, and part of the still liquid is fed into a reboiler after being boosted by the pump, and the rest of the still liquid is temporarily stored in a light-component heavy-component tank as a byproduct (heavy component). The screw pump 23 avoids the problem of unstable operation of the conventional centrifugal pump under high temperature and high vacuum conditions, and increases the stability of the operation of the device. In addition, the selection of the screw pump 23 reduces the requirement on the installation height of the crude phenol refining tower 3, and reduces the equipment investment.
Optionally, the first light component outlet 18 is connected with a first condensation reflux unit, the first condensation reflux unit comprises a first condenser, a first reflux tank 25 and a first reflux pump which are sequentially connected, a gas outlet of the first reflux tank 25 is connected with a non-condensable gas pipeline 26, and a liquid outlet is connected with the first tower top reflux port 19 and the light component tank in parallel through the first reflux pump;
The light components and a small amount of water separated from the crude phenol refining tower 3 are discharged from a first light component outlet 18, condensed by a first condenser, liquid enters a first reflux tank 25, noncondensable gas in the first reflux tank 25 is discharged into a noncondensable gas pipeline 26, and is treated, liquid in the first reflux tank 25 is partially refluxed to the top of the crude phenol refining tower 3 by a first reflux pump, and partially enters the light component tank for temporary storage.
Under the condition of meeting the pressure, the raw material of the crude phenol is sent into the middle lower part of the crude phenol refining tower 3 from a crude phenol feed inlet 16, and the light components and water rise along the tower under the action of the rising gas phase of the tower kettle by virtue of the difference of boiling points of different components; under the action of the reflux liquid at the top of the tower, the heavy component descends along the tower. The tower bottom is provided with reboiling heat by a heating medium. Refined crude phenol is extracted from a refined phenol outlet 17, and is sent into a phenol rectifying tower 4 after being boosted by a pump. Compared with the crude phenol (60 ℃ -100 ℃) extracted from the top of the heavy-duty self-stripping tower, the crude phenol refining tower 3 extracts the refined phenol (120 ℃ -150 ℃) from the side line of the refined phenol outlet 17, the temperature is higher, the energy consumption of the phenol rectifying tower 4 is reduced, and the risk of crystallization of the refined crude phenol at low temperature is avoided.
Optionally, a second light component outlet 30 and a second tower top reflux port 31 are arranged at the top of the phenol rectifying tower 4, a second tower kettle reflux port 32 is arranged at the bottom of the phenol rectifying tower, the phenol mixing outlet 28 is connected with a phenol mixing pump and a second reboiler 33 in parallel, and an outlet of the second reboiler 33 is connected with the second tower kettle reflux port 32 and is used for forming tower bottom reflux and discharging part of phenol mixing.
Optionally, the second light component outlet 30 is connected to a second condensation reflux unit, the second condensation reflux unit includes a second condenser, a second reflux tank 34 and a second reflux pump which are sequentially connected, a gas outlet of the second reflux tank 34 is connected to the non-condensable gas pipeline 26, and a liquid outlet is connected in parallel with a second tower top reflux port 31 and a circulating reflux port 35 at the upper part of the crude phenol refining tower 3 through the second reflux pump;
The light components separated from the phenol rectifying tower 4 are discharged from a second light component outlet 30, condensed by a second condenser, the liquid enters a second reflux tank 34, noncondensable gas in the second reflux tank 34 is discharged into a noncondensable gas pipeline 26 for further treatment, and the liquid in the second reflux tank 34 is partially refluxed to the top of the phenol rectifying tower 4 by a second reflux pump, and partially refluxed to the crude phenol rectifying tower 3.
Further optionally, the recycle return 35 of the crude phenol refining column 3 is located above the refined phenol outlet 17.
Feeding the refined crude phenol into the middle upper part of a phenol rectifying tower 4, lifting phenol and a small amount of light components along the tower under the action of lifting gas phase of a tower kettle by virtue of the difference of boiling points of different components, and collecting a phenol product by a phenol outlet 27; under the action of the reflux liquid phase, the mixed phenols descend along the column. After condensing the light component and a small amount of phenol, the pressure is raised by a pump, a part of the condensed light component and a part of the condensed light component are returned to the upper part of the crude phenol refining tower 3 by providing reflux of the phenol rectifying tower 4. The tower bottom is provided with reboiling heat by a heating medium. The mixed phenols are extracted from the tower kettle, boosted by a pump and then sent into a separation tower 5.
Optionally, the top of the separation tower 5 is provided with an o-cresol outlet 39 and a third tower top reflux port 40, the tower bottom is provided with a third tower bottom reflux port 41, the second outlet 38 is connected with a xylenol pump and a third reboiler 42 in parallel, and the outlet of the third reboiler 42 is connected with the third tower bottom reflux port 41 for forming tower bottom reflux and discharging part of xylenol.
Optionally, the o-cresol outlet 39 is connected with a third condensation reflux unit, the third condensation reflux unit comprises a third condenser, a third reflux tank 43 and a third reflux pump which are sequentially connected, a gas outlet of the third reflux tank 43 is connected with the non-condensable gas pipeline 26, and a liquid outlet is connected with the third tower top reflux port 40 and the o-cresol tank in parallel through the third reflux pump;
The o-cresol separated by the separation tower 5 is discharged from the o-cresol outlet 39, condensed by a third condenser, the liquid enters a third reflux tank 43, noncondensable gas in the third reflux tank 43 is discharged into a noncondensable gas pipeline 26 for further treatment, and the liquid in the third reflux tank 43 is partially refluxed to the top of the separation tower 5 by a third reflux pump, and partially enters the o-cresol tank for temporary storage.
The mixed phenols are pumped up and then sent to the middle lower part of the separation tower 5, and the o-cresol and m-cresol rise along the tower under the action of rising gas phase of the tower bottom by means of the difference of boiling points of different components; the xylenes descend along the column under the action of the reflux liquid phase. After condensation of the o-cresol, the pressure is raised by a pump, a part of which is fed back to the separation column 5 and a part of which is fed out as an o-cresol product. The tower bottom is provided with reboiling heat by a heating medium. Xylenol product is withdrawn from the column bottoms and m-para-cresol product is withdrawn from the first outlet 37.
Claims (9)
1. The device is characterized by comprising an extraction tower, a crude phenol pretreatment tower, a crude phenol refining tower, a phenol rectifying tower and a separation tower which are connected in sequence, wherein the upper part of the extraction tower is provided with a wastewater inlet, the top is provided with an extract outlet, the bottom is provided with an extractant inlet, and the extract outlet is connected with a phenol extraction feed inlet at the upper part of the crude phenol pretreatment tower and is used for inputting a phenol-containing extractant obtained by extraction into the crude phenol pretreatment tower;
The top of the crude phenol pretreatment tower is provided with a solvent outlet, and the bottom of the crude phenol pretreatment tower is provided with a crude phenol outlet which is respectively used for discharging the extractant and the crude phenol obtained by separation; the crude phenol outlet is connected with a crude phenol feed inlet of the crude phenol refining tower;
The middle lower part of the crude phenol refining tower is provided with a crude phenol feed inlet, the upper part of the crude phenol refining tower is provided with a refined phenol outlet, the refined phenol outlet is connected with the refined phenol feed inlet at the middle upper part of the phenol rectifying tower through a pipeline, and the top of the crude phenol refining tower is connected with a first condensation reflux unit for discharging light components separated from the crude phenol; discharging the separated heavy components from the bottom of the crude phenol refining tower;
The upper part of the phenol rectifying tower is provided with a phenol outlet, and the bottom is provided with a mixed phenol outlet which is respectively used for discharging the separated phenol and mixed phenol; the mixed phenol outlet is connected with a mixed phenol feed inlet at the middle lower part of the separation tower through a pipeline; the top of the phenol rectifying tower is connected with a second condensing reflux unit for discharging light components separated from refined phenol;
the top of the separation tower is connected with a third condensing reflux unit for discharging the o-cresol separated from the mixed phenol; the middle part of the separation tower is provided with a first outlet, and the bottom is provided with a second outlet which is respectively used for discharging the m-cresol and the xylenol which are obtained by separation.
2. The apparatus for recovering and refining crude phenol from semi-coke wastewater as claimed in claim 1, wherein a wastewater outlet is provided at the bottom of the extraction tower for discharging wastewater after removing crude phenol.
3. The device for recycling and refining crude phenol from semi-coke wastewater according to claim 1, wherein a phenol extraction return port is arranged at the bottom of the crude phenol pretreatment tower, a solvent return port is arranged at the upper part of the crude phenol pretreatment tower, the crude phenol outlet is connected with the crude phenol refining tower and a crude phenol pretreatment tower reboiler in parallel, and the outlet of the crude phenol pretreatment tower reboiler is connected with the phenol extraction return port to return part of crude phenol into the crude phenol pretreatment tower;
The solvent outlet is sequentially connected with the solvent condenser and the solvent tank, and the outlet of the solvent tank is connected with the solvent reflux port and the extractant inlet of the extraction tower in parallel.
4. The device for recovering and refining crude phenol from semi-coke wastewater according to claim 1, wherein a first light component outlet and a first tower top reflux port are arranged at the top of the crude phenol refining tower, a heavy component outlet and a first tower bottom reflux port are arranged at the bottom of the crude phenol refining tower, the heavy component outlet is sequentially connected with a scraper filter and a screw pump, an outlet of the screw pump is connected with a first reboiler and a heavy component tank in parallel, and an outlet of the first reboiler is connected with the first tower bottom reflux port for forming tower bottom reflux and discharging part of heavy component substances.
5. The apparatus for recovering and refining crude phenol from semi-coke wastewater according to claim 4, wherein the first light component outlet is connected with a first condensing reflux unit, the first condensing reflux unit comprises a first condenser, a first reflux tank and a first reflux pump which are sequentially connected, the gas outlet of the first reflux tank is connected with a non-condensable pipeline, and the liquid outlet is connected with the first tower top reflux port and the light component tank in parallel through the first reflux pump.
6. The device for recovering and refining crude phenol from semi-coke wastewater according to claim 1, wherein a second light component outlet and a second tower top reflux port are arranged at the top of the phenol rectifying tower, a second tower bottom reflux port is arranged at the bottom of the phenol rectifying tower, a phenol mixing pump and a second reboiler are connected in parallel with the phenol mixing outlet, and an outlet of the second reboiler is connected with the second tower bottom reflux port and is used for forming tower bottom reflux and discharging part of phenol mixing.
7. The apparatus for recovering and refining crude phenol from semi-coke wastewater according to claim 6, wherein the second light component outlet is connected with a second condensing reflux unit, the second condensing reflux unit comprises a second condenser, a second reflux tank and a second reflux pump which are sequentially connected, the gas outlet of the second reflux tank is connected with a non-condensable pipeline, and the liquid outlet is connected with a second tower top reflux port and a circulating reflux port at the upper part of the crude phenol refining tower in parallel through the second reflux pump.
8. The apparatus for recovering and refining crude phenol from semi-coke wastewater according to claim 1, wherein the top of the separation tower is provided with an o-cresol outlet and a third tower top reflux port, the bottom of the separation tower is provided with a third tower bottom reflux port, the second outlet is connected with a xylenol pump and a third reboiler in parallel, and the outlet of the third reboiler is connected with the third tower bottom reflux port for forming tower bottom reflux and discharging part of xylenol.
9. The apparatus for recovering and refining crude phenol from semi-coke wastewater according to claim 8, wherein the o-cresol outlet is connected with a third condensing reflux unit, the third condensing reflux unit comprises a third condenser, a third reflux tank and a third reflux pump which are sequentially connected, a gas outlet of the third reflux tank is connected with a non-condensable pipeline, and a liquid outlet is connected with the third overhead reflux port and the o-cresol tank in parallel through the third reflux pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322959969.9U CN221093985U (en) | 2023-11-02 | 2023-11-02 | Device for recycling crude phenol from semi-coke wastewater and refining crude phenol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322959969.9U CN221093985U (en) | 2023-11-02 | 2023-11-02 | Device for recycling crude phenol from semi-coke wastewater and refining crude phenol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221093985U true CN221093985U (en) | 2024-06-07 |
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