CN217578368U - Coking wastewater phenol recovery device - Google Patents
Coking wastewater phenol recovery device Download PDFInfo
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- CN217578368U CN217578368U CN202221434331.2U CN202221434331U CN217578368U CN 217578368 U CN217578368 U CN 217578368U CN 202221434331 U CN202221434331 U CN 202221434331U CN 217578368 U CN217578368 U CN 217578368U
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Abstract
The utility model provides a coking wastewater phenol recovery unit, relates to the chemical production field, in order to solve the existing equipment production process, the sewage volume of production is few, but the phenol content is high, and the ability that the existing equipment handled phenol is not enough, can produce environmental pollution, the problem of wasting of resources, the utility model discloses a to extraction column, extraction looks buffer tank, solvent stripping tower, solvent recovery tower, feeding pre-heater an, feeding pre-heater b, the scientific design of coarse phenol cooler is connected, utilizes the difference of solvent and phenol boiling point, realizes the recovery to phenol, through the utility model discloses can carry out high-efficient recovery to phenol after the processing, can not produce environmental pollution, the problem of wasting of resources reaches real innocent treatment.
Description
Technical Field
The utility model belongs to the chemical production field, concretely relates to coking wastewater phenol recovery unit.
Background
The coking process of coal can generate a large amount of phenol-containing wastewater, and the sewage generated in the coal coking process is characterized in that: the sewage is less, but the phenol content is high. According to the national environmental protection requirement, the waste water can be discharged after dephenolization treatment reaches the standard. The following methods are widely used in coke plants: 1. transferring the phenol contaminants to the air; 2. toxic substances are converted into non-toxic substances, and the method has high operation cost and is difficult to realize industrialization; 3. the method has high requirement on the quality of inlet water, is easy to form new pollutants such as sludge and the like, and can not lead the discharged water quality to reach the standard.
SUMMERY OF THE UTILITY MODEL
In order to solve the existing equipment production process, the sewage of production: the sewage is less, but the phenol content is high, the existing equipment has insufficient capability of treating phenol, and the problems of environmental pollution and resource waste can be caused.
The utility model provides a coking wastewater phenol recovery device, which comprises a feed cooler, an extraction tower, a solvent stripping tower, a solvent recovery tower, an extraction phase buffer tank, a solvent recovery tower feed pump, a solvent stripping tower feed pump, a feed preheater a, a wastewater discharge pump, a reboiler a, an overhead condenser a, a wastewater cooler, a solvent reflux tank, a solvent circulating pump, a solvent reflux pump, an overhead condenser b, a reboiler b, a crude phenol discharge pump, a feed preheater b and a crude phenol cooler;
the top end of the extraction tower is connected with an extraction phase cache tank, and the bottom end of the extraction tower is connected with a solvent stripping tower through a solvent stripping tower feed pump and a feed preheater a in sequence;
the extraction phase buffer tank is connected to the middle part of the solvent recovery tower through a feed pump and a feed preheater b of the solvent recovery tower in sequence;
the top end of the solvent stripping tower is connected to a solvent reflux tank through a tower top condenser a, one end of the bottom of the solvent stripping tower is discharged outside through a wastewater discharge pump, a feeding preheater a and a wastewater cooler in sequence, and the other end of the bottom of the solvent stripping tower is connected to the bottom of the solvent stripping tower through a reboiler a;
one end of the bottom of the solvent reflux tank is connected to the bottom of the extraction tower through a solvent circulating pump, and the other end of the bottom of the solvent reflux tank is connected to the upper part of the solvent recovery tower through a solvent reflux pump;
the top of the solvent recovery tower is connected to a solvent reflux tank through a tower top condenser b, one end of the bottom of the solvent recovery tower is linked back to the bottom of the solvent recovery tower through a reboiler b, and the other end of the bottom of the solvent recovery tower is discharged outside through a crude phenol discharging pump, a feeding preheater b and a crude phenol cooler in sequence.
And a dephlegmator is arranged at the top of the solvent stripping tower.
The utility model discloses the advantage:
the utility model discloses an extraction tower, extraction looks buffer memory jar, solvent stripping tower, solvent recovery tower, utilize the difference of solvent and phenol boiling point, through having solved in the existing equipment production process, the sewage volume of production is few, but the phenol content is high, and the ability of existing equipment processing phenol is not enough, can produce environmental pollution, the problem of wasting of resources, through the utility model discloses can carry out high-efficient recovery to phenol after the processing, can not produce environmental pollution, the problem of wasting of resources reaches real innocent treatment.
Drawings
Fig. 1 is a schematic structural diagram of the present invention:
description of reference numerals:
1. a feed cooler; 2. an extraction tower; 3. a solvent stripper; 4. a solvent recovery column; 5. an extract phase buffer tank; 6. a solvent recovery column feed pump; 7. a solvent stripper feed pump; 8. a feed preheater a; 9. a waste water discharge pump; 10. a reboiler a; 11. a tower top condenser a; 12. a wastewater cooler; 13. a solvent reflux tank; 14. a solvent circulation pump; 15. a solvent reflux pump; 16. a tower top condenser b; 17. a reboiler b; 18. a crude phenol discharge pump; 19. a feed preheater b; 20. a crude phenol cooler; 21. a dephlegmator.
Detailed Description
As shown in fig. 1:
the utility model relates to a coking wastewater phenol recovery device, including feeding cooler 1, extraction column 2, solvent stripping tower 3, solvent recovery tower 4, extraction looks buffer tank 5, solvent recovery tower charge pump 6, solvent stripping tower charge pump 7, feeding preheater a8, waste water discharge pump 9, reboiler a10, overhead condenser a11, waste water cooler 12, solvent reflux tank 13, solvent circulating pump 14, solvent reflux pump 15, overhead condenser b16, reboiler b17, crude phenol discharge pump 18, feeding preheater b19, crude phenol cooler 20;
the top end of the extraction tower 2 is connected with an extraction phase cache tank 5, and the bottom end of the extraction tower 2 is connected with a solvent stripping tower 3 through a solvent stripping tower feed pump 7 and a feed preheater a8 in sequence;
the extraction phase buffer tank 5 is connected to the middle part of the solvent recovery tower 4 through a solvent recovery tower feed pump 6 and a feed preheater b19 in sequence;
the top end of the solvent stripping tower 3 is connected to a solvent reflux tank 13 through a tower top condenser a11, one end of the bottom of the solvent stripping tower 3 is discharged outside through a wastewater discharge pump 9, a feed preheater a8 and a wastewater cooler 12 in sequence, and the other end of the bottom of the solvent stripping tower 3 is connected back to the bottom of the solvent stripping tower 3 through a reboiler a 10;
one end of the bottom of the solvent reflux tank 13 is connected to the bottom of the extraction tower 2 through a solvent circulating pump 14, and the other end of the bottom of the solvent reflux tank 13 is connected to the upper part of the solvent recovery tower 4 through a solvent reflux pump 15;
the top of the solvent recovery tower 4 is connected to a solvent reflux tank 13 through a tower top condenser b16, one end of the bottom of the solvent recovery tower 4 is connected back to the bottom of the solvent recovery tower 4 through a reboiler b17, and the other end of the bottom of the solvent recovery tower 4 is discharged outside through a crude phenol discharging pump 18, a feeding preheater b19 and a crude phenol cooler 20 in sequence.
A dephlegmator 21 is arranged at the top of the solvent stripping tower 3.
The phenol-containing wastewater from the front end of the coking process is cooled to about 50 ℃ by a feed cooler 1, enters the top of an extraction tower 2, and is in countercurrent contact with an extractant entering from a tower kettle to extract phenol in the wastewater.
The raffinate phase from the tower bottom of the extraction tower 2 and the tower bottom liquid of the solvent stripping tower 3 enter the solvent stripping tower 3 after heat exchange through a feeding preheater a8, and the solvent stripping tower 3 is provided with a reboiler a10 as a heat source of the solvent stripping tower 3. The solvent that comes out from the steam stripping of solvent stripping tower 3 top is concentrated through the dephlegmator back, gets into and gets back to solvent reflux tank 13 after tower top condenser a11 cooling, and the purified water that comes out from solvent stripping tower 3 tower cauldron carries out a heat transfer cooling through feeding preheater a8 with solvent stripping tower 3 earlier after 9 pressurizations of waste water discharge pump, then goes out the device after further cooling through waste water cooler 12.
The extraction phase from the top of the extraction tower 2 firstly enters an extraction phase buffer tank, is pressurized by a solvent recovery tower feed pump 6 after standing and separating water, enters a solvent recovery tower 4 after exchanging heat with tower bottom liquid of the solvent recovery tower 4 through a feed preheater b19, and is recovered by the rectification principle, and the solvent recovery tower 4 is provided with a reboiler b17 as a heat source of the solvent recovery tower 4. The solvent coming out from the top of the solvent recovery tower 4 is cooled by a tower top condenser b16 and then returns to the solvent reflux tank 13, the solvent in the solvent reflux tank 13 is divided into two paths, one path of the solvent is pressurized by a solvent reflux pump 15 and then enters the top of the solvent recovery tower 4 as reflux, and the other path of the solvent is pressurized by a solvent circulating pump 14 and then returns to the extraction tower 2 for recycling. The crude phenol product from the tower kettle is pressurized by a crude phenol product pump 18, and then is subjected to primary heat exchange and temperature reduction with the solvent recovery tower 4 through a feed preheater b19, and then is further cooled by a crude phenol cooler 20 and then is discharged out of the device. Fresh solvent is directly replenished from the solvent reflux drum 13.
The main functions are as follows:
1. an extraction system is added, and the distribution coefficients of phenol in the solvent are different, so that the compound is transferred from water to the seed solvent, and most of phenolic substances are extracted through multi-stage multiple extraction. An extract phase buffer tank 5 is arranged at the top of the extraction tower 2, moisture carried by the extract phase is kept stand and layered in the buffer tank, the separated water phase returns to the raw material tank, the extract phase is pressurized by a pump and then enters a solvent recovery tower 4, and raffinate phase in the tower kettle is pressurized by a pump and then enters a solvent stripping tower 3.
2. And a solvent stripping tower 3 is added, the solvent of the raffinate phase is stripped in the solvent stripping tower 3, a dephlegmator 21 is arranged at the top of the solvent stripping tower 3, the stripped solvent is further concentrated, and then the solvent is cooled and cooled for recycling.
3. And a solvent recovery tower 4 is added to recover the solvent and the phenol product of the extraction phase, the solvent and the phenol are separated by utilizing the difference of the boiling points of the solvent and the phenol, and the solvent is recycled after being cooled.
4. And a feeding preheater a8 and a feeding preheater b19 are added, so that the feeding of the solvent stripping tower 3 and the solvent recovery tower 4 and the tower bottom liquid exchange heat, and steam and circulating cooling water are saved.
The content of the utility model is to provide a set of coking wastewater phenol recovery unit, through processes such as "extraction-solvent strip-solvent recovery" the phenolic substance extraction in the waste water to the phenolic wastewater that the coke-oven plant produced to retrieve the phenol product, the qualified water after the processing goes reuse or goes biochemical further processing.
Claims (2)
1. The utility model provides a coking wastewater phenol recovery unit, including feeding cooler (1), extraction column (2), solvent stripping tower (3), solvent recovery tower (4), extraction phase buffer tank (5), solvent recovery tower charge pump (6), solvent stripping tower charge pump (7), feeding preheater a (8), waste water discharge pump (9), reboiler a (10), overhead condenser a (11), waste water cooler (12), solvent reflux tank (13), solvent circulating pump (14), solvent reflux pump (15), overhead condenser b (16), reboiler b (17), crude phenol discharge pump (18), feeding preheater b (19), crude phenol cooler (20), its characterized in that:
the top end of the extraction tower (2) is connected with an extraction phase cache tank (5), and the bottom end of the extraction tower (2) is connected with the solvent stripping tower (3) through a solvent stripping tower feed pump (7) and a feed preheater a (8) in sequence;
the extraction phase buffer tank (5) is connected to the middle part of the solvent recovery tower (4) through a solvent recovery tower feed pump (6) and a feed preheater b (19) in sequence;
the top end of the solvent stripping tower (3) is connected to a solvent reflux tank (13) through a tower top condenser a (11), one end of the bottom of the solvent stripping tower (3) is discharged outside through a wastewater discharge pump (9), a feed preheater a (8) and a wastewater cooler (12) in sequence, and the other end of the bottom of the solvent stripping tower (3) is connected back to the bottom of the solvent stripping tower (3) through a reboiler a (10);
one end of the bottom of the solvent reflux tank (13) is connected to the bottom of the extraction tower (2) through a solvent circulating pump (14), and the other end of the bottom of the solvent reflux tank (13) is connected to the upper part of the solvent recovery tower (4) through a solvent reflux pump (15);
the top of the solvent recovery tower (4) is connected to a solvent reflux tank (13) through a tower top condenser b (16), one end of the bottom of the solvent recovery tower (4) is connected back to the bottom of the solvent recovery tower (4) through a reboiler b (17), and the other end of the bottom of the solvent recovery tower (4) is discharged outside through a crude phenol discharging pump (18), a feeding preheater b (19) and a crude phenol cooler (20) in sequence.
2. The phenol recovery device for the coking wastewater of claim 1, which is characterized in that: and a dephlegmator (21) is arranged at the top of the solvent stripping tower (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221434331.2U CN217578368U (en) | 2022-06-10 | 2022-06-10 | Coking wastewater phenol recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221434331.2U CN217578368U (en) | 2022-06-10 | 2022-06-10 | Coking wastewater phenol recovery device |
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| Publication Number | Publication Date |
|---|---|
| CN217578368U true CN217578368U (en) | 2022-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221434331.2U Active CN217578368U (en) | 2022-06-10 | 2022-06-10 | Coking wastewater phenol recovery device |
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| Country | Link |
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| CN (1) | CN217578368U (en) |
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2022
- 2022-06-10 CN CN202221434331.2U patent/CN217578368U/en active Active
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