CN215049776U - System for extracting dihydric phenol from wastewater - Google Patents
System for extracting dihydric phenol from wastewater Download PDFInfo
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- CN215049776U CN215049776U CN202120768575.3U CN202120768575U CN215049776U CN 215049776 U CN215049776 U CN 215049776U CN 202120768575 U CN202120768575 U CN 202120768575U CN 215049776 U CN215049776 U CN 215049776U
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Abstract
The utility model belongs to the technical field of chemical industry waste water treatment, concretely relates to system for draw dihydric phenol from waste water. The utility model discloses an extraction unit and fraction cutting unit's cooperation, at first extract a large amount of phenolic substances that contain in the waste water, then divide into its fraction (light fraction) that is rich in the monohydric phenol mixture and the fraction (middle distillate) that is rich in the dihydric phenol mixture according to the boiling point difference, find a suitable solvent and extract the purification to wherein rich in the dihydric phenol mixture, detach impurity such as wherein monohydric phenol, arene, alkane, heteroatom compound to realize the high-efficient separation of dihydric phenol.
Description
Technical Field
The utility model belongs to the technical field of chemical industry waste water treatment, concretely relates to system for draw dihydric phenol from waste water.
Background
The shortage of water resources has become the bottleneck of sustainable development of coal chemical industry. The near zero emission environmental protection standard of the coal chemical industry wastewater is mandatory and is an important measure for sustainable utilization of water resources. Various wastewater near-zero-emission treatment processes have been developed and implemented in the industry and academia, but no process can really realize zero emission of wastewater in coal tar process application.
The phenolic compound in the phenolic wastewater is a toxic substance and is a type of wastewater which is common in industrial wastewater and is difficult to degrade. The phenol-containing waste water is harmful to human health and easy to destroy natural ecological balance, so that dephenolization treatment is required before discharge. The phenol ammonia recovery unit is a tap unit of the sewage treatment system, can further reduce the phenol ammonia content, and especially has great significance for realizing zero discharge of wastewater by recovering dihydric phenol in wastewater.
There are many methods for treating phenol-containing wastewater, including steam chemical dephenolization, steam dephenolization, incineration, solvent extraction dephenolization, biochemical methods, and the like. The solvent extraction dephenolization method has the advantages of low cost, good effect, mature technology, low energy consumption, easy operation, simultaneous removal of unit phenol and polyhydric phenol and the like, so when the wastewater containing high-concentration phenol and ammonia is treated, the solvent extraction method is usually adopted to remove and recover the phenolic substances in the wastewater containing phenol and ammonia in the coal chemical industry.
For example, in the coal chemical wastewater extraction dephenolization system disclosed in the prior art, two different solvents are used as extraction agents, two-stage extraction dephenolization is performed by adopting a series connection double tower, after high-concentration phenol-containing wastewater generated in the coal chemical process is subjected to gravity settling oil removal pretreatment, deacidification, deamination and mechanical impurity removal, first-stage extraction dephenolization is performed by using the first solvent as the extraction agent, then second-stage extraction dephenolization is performed by using the second solvent as the extraction agent, and then dephenolized water is sent to a biochemical treatment section. The system only depends on a series double-tower two-stage extraction dephenolization system to dephenolize, and the effect of the system needs to be further improved.
Therefore, developing a system for efficiently removing dihydric phenol from wastewater, so that the content of the dihydric phenol in the industrial wastewater is far lower than the environmental protection standard, and simultaneously, in order to meet the optimization of industrial structure and the environmental protection requirement and realize the concept of changing waste into valuable, the secondary utilization of the dihydric phenol removed from the wastewater is still the key point of the current research work.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming dephenolization inefficiency in the waste water among the prior art, and dephenolization effect remains defects such as further improvement to a system of follow extraction dihydric phenol in waste water is provided.
Therefore, the utility model provides a following technical scheme:
the utility model provides a system for extracting dihydric phenol from waste water, which comprises,
the pretreatment unit is used for carrying out oil removal, deacidification and deamination treatment on the wastewater to be treated;
the extraction unit comprises a phenol oil extraction device, a first agent removing tower and a dihydric phenol purification device, wherein the phenol oil extraction device and the first agent removing tower are communicated; wherein the phenol oil extraction device is connected with the pretreatment unit;
and the fraction cutting unit is respectively connected with the first agent removing tower and the dihydric phenol purifying device.
Optionally, the system further comprises a rectification unit connected with the dihydric phenol purification device.
Optionally, the pretreatment unit comprises an oil separation tank, a deacidification tower and a deamination tower which are connected in sequence.
Optionally, the top of the phenol oil extraction device is provided with an oil phase outlet, the bottom of the phenol oil extraction device is provided with a dephenolized wastewater outlet, and the oil phase outlet is connected with an inlet of the first dephenolizing tower.
Optionally, the top of the first solvent removal tower is provided with a first solvent outlet, the bottom of the first solvent removal tower is provided with a phenol oil outlet, and the phenol oil outlet is connected with the fraction cutting unit.
Optionally, the system further comprises a first solvent storage tank, which is respectively connected with the first solvent outlet and the phenol oil extraction device.
Optionally, the system further comprises a second solvent removal tower, and a feed inlet of the second solvent removal tower is connected with a solvent outlet of the dihydric phenol purification device.
Optionally, the system further comprises a second solvent storage tank, which is respectively connected with the second agent removing tower and the dihydric phenol purifying device.
Optionally, the fraction cutting unit includes a fractionating tower, the fractionating tower is provided with a light fraction outlet, an intermediate fraction outlet and a heavy fraction outlet, and the intermediate fraction outlet is connected to the dihydric phenol purification device.
Optionally, the phenol oil extraction device is a phenol oil extraction tower, a pipeline mixer or a combination of a mixing tank and a separation tank;
the dihydric phenol purification device is a dihydric phenol purification tower, a pipeline mixer or a combination of a mixing tank and a separation tank.
The utility model discloses technical scheme has following advantage:
the utility model provides a system for extracting dihydric phenol from waste water, which comprises a pretreatment unit, a deacidification unit and a deamination unit, wherein the pretreatment unit is used for removing oil, deacidifying and deaminating the waste water to be treated; the extraction unit comprises a phenol oil extraction device, a first agent removing tower and a dihydric phenol purification device, wherein the phenol oil extraction device and the first agent removing tower are communicated; wherein the phenol oil extraction device is connected with the pretreatment unit; and the fraction cutting unit is respectively connected with the first agent removing tower and the dihydric phenol purifying device. The utility model discloses an extraction unit and fraction cutting unit's cooperation, at first extract a large amount of phenolic substances that contain in the waste water, then divide into its fraction (light fraction) that is rich in the monohydric phenol mixture and the fraction (middle distillate) that is rich in the dihydric phenol mixture according to the boiling point difference, find a solvent and extract the purification to wherein rich in the dihydric phenol mixture, detach impurity such as wherein monohydric phenol, arene, alkane, heteroatom compound to realize the high-efficient separation of dihydric phenol.
The utility model provides a system for draw dihydric phenol in follow waste water still includes the rectification unit, with dihydric phenol purification device connects. The purified dihydric phenol can be rectified to further obtain various dihydroxybenzene products such as catechol, resorcinol, hydroquinone, etc.
The utility model provides a system for draw dihydric phenol in follow waste water, wherein the setting of first agent tower, first solvent storage tank and second agent tower and second solvent storage tank of taking off can realize the recycle of solvent, resources are saved reduction in production cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a system for extracting dihydric phenol from wastewater provided by the present invention;
in the figure, 1, an oil separation tank; 2. a deacidification tower; 3. a deamination tower; 4. a phenol oil extraction device; 5. a first solvent storage tank; 6. a first stripper column; 7. a fractionating column; 8. a dihydric phenol purifying device; 9. a second solvent storage tank; 10. a second stripper column; 11 a rectifying tower.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "middle", "bottom", "top", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "communicate" and "connect" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides a system for extracting dihydric phenol from wastewater, as shown in fig. 1, which comprises an oil separation tank 1, an deacidification tower 2, a deamination tower 3, a phenol oil extraction device 4, a first agent removal tower 6, a fractionating tower 7, a dihydric phenol purification device 8 and a rectifying tower 11 which are connected in sequence.
The oil separation tank 1 is used for separating light oil and heavy oil in the wastewater to obtain deoiled wastewater, and the middle part of the oil separation tank is provided with an deoiled wastewater outlet connected with an inlet of the deacidification tower 2. The deacidification tower 2 is used for removing acidic substances in the deoiled wastewater, the top of the deacidification tower is provided with an acidic gas outlet, and the bottom of the deacidification tower is provided with a deacidification wastewater outlet connected with an inlet of the deamination tower 3. The deamination tower 3 is used for removing ammonia in the deacidification wastewater, the top of the deamination tower is provided with an ammonia gas outlet, and the bottom of the deamination tower is provided with a deamination wastewater outlet which is connected with an inlet at the upper part of the phenol oil extraction device 4. The phenol oil extraction device 4 is a phenol oil extraction tower and is used for removing phenolic substances in the wastewater after ammonia removal, an inlet at the lower part of the phenol oil extraction device is connected with an outlet of a first solvent storage tank 5, an outlet at the top of the phenol oil extraction device is connected with an inlet of a first agent removal tower 6, and the dephenolized wastewater is sent to a subsequent biochemical treatment device from an outlet at the bottom of the phenol oil extraction device. The first solvent removing tower 6 is used for recovering the solvent and separating the solvent from the phenol oil, the solvent outlet at the top of the tower is connected with the inlet of the first solvent storage tank 5 to achieve the aim of recycling the solvent, and the phenol oil outlet at the bottom of the tower is connected with the inlet of the fractionating tower 7.
The fractionating apparatus comprises a fractionating column 7 for cutting the phenol oil extracted from the waste water into a narrow fraction rich in the mixture of monohydric phenol (fraction less than 240 ℃, light fraction) and the crude dihydric phenol (fraction 240-.
The dihydric phenol purifying device is a dihydric phenol purifying tower, and further comprises a second solvent storage tank 9 and a second solvent removing tower 10. The dihydric phenol purifying tower is used for extracting and purifying the crude dihydric phenol to remove impurities such as monohydric phenol, aromatic hydrocarbon, alkane, heteroatom compounds and the like, thereby avoiding the influence on the subsequent separation of the dihydric phenol and improving the rectification effect of the dihydric phenol. The dihydric phenol purifying tower is provided with an upper inlet connected with a side outlet of the fractionating tower 7 and a lower inlet connected with an outlet of the second solvent storage tank 9, the top of the tower is provided with an extracted solvent outlet connected with an inlet of the second agent removing tower 10, and the bottom of the tower is provided with a purified dihydric phenol outlet connected with an inlet of the rectifying tower 11. The second solvent removing tower 10 is used for recovering the solvent, so that the solvent is separated from the substances extracted from the crude dihydric phenol, the solvent outlet at the top of the tower is connected with the inlet of a second solvent storage tank 9, the purpose of recycling the solvent is achieved, and the substances after the solvent removal are discharged from the outlet at the bottom of the tower and sent to the subsequent working procedures for treatment.
The rectifying unit is a rectifying tower 11, which is provided with an inlet connected with the outlet at the bottom of the dihydric phenol purifying device 8 and a diphenol product outlet, and is used for separating the purified dihydric phenol to obtain various diphenol products such as catechol, resorcinol, hydroquinone and the like.
As an alternative embodiment of this example, the phenol oil extraction column and the dihydric phenol purification column can be replaced by pipeline mixers or a combination of mixing tanks and knockout drums to achieve the same extraction effect.
The specific application case is as follows:
a method for extracting dihydric phenol from wastewater is carried out by adopting the system provided in the embodiment, and comprises the following specific steps:
wastewater source and composition: the wastewater treated by the embodiment is mainly coking wastewater. The coking wastewater mainly comes from wastewater generated in the processes of coal coking, coal gas purification and the like, has complex components and contains various impurities such as tar, carbon dioxide, hydrogen sulfide, phenol, ammonia, dust, fatty acid and the like. The typical wastewater quality is about 10000mg/L of phenol, 2000mg/L of ammonia nitrogen, 30000mg/L of COD and 800mg/L of oil, and simultaneously contains a small amount of heterocyclic compounds such as pyridine and the like which are difficult to biodegrade and polycyclic aromatic compounds such as biphenyl, naphthalene and the like.
Removing oil from the wastewater: most of oil in the coal chemical industry wastewater is removed in the oil separation tank by utilizing the difference of density and polarity.
Deacidifying wastewater: acid gas in the oil removal wastewater is removed by heating and stripping.
Deamination of wastewater: the ammonia in the acid-removing wastewater is removed by stripping action and is cooled and recovered.
Extracting phenol from wastewater: extracting phenolic substances in the deamination wastewater by using the solvent A to obtain dephenolization wastewater, and sending the dephenolization wastewater to subsequent biochemical treatment. Wherein the mass ratio of the solvent A to the deamination wastewater is 1:10, and the extraction temperature is 45 ℃. The solvent A is one or more of ethyl acetate, dimethyl carbonate or ketones, and dimethyl carbonate is selected in the embodiment.
Removing agent of phenol-containing solvent: and (3) carrying out reduced pressure distillation on the phenol-containing solvent to remove the solvent A to obtain phenol oil rich in phenolic substances, and realizing the recycling of the solvent A. The components and contents of the phenol oil obtained by the method are shown in Table 1.
TABLE 1 phenolic oil Components and amounts
| Components | Monohydric phenol | Dihydric phenols | Aromatic hydrocarbons | Alkane(s) | Heteroatom compounds |
| Content (%) | 65.60 | 12.47 | 10.04 | 7.12 | 4.77 |
And (3) cutting the phenolic oil fraction: the analysis of the components and the content of the phenol oil shows that the dihydric phenol is mainly present in the fraction segment at 310 ℃ of 240-. The phenol oil is cut into a fraction at the temperature of less than 240 ℃, a fraction at the temperature of 240 ℃ and 310 ℃ and a fraction at the temperature of more than 310 ℃. Wherein the fraction below 240 ℃ is used as the raw material for phenol, cresol and xylenol process, the fraction above 310 ℃ is used for hydrogenation raw oil, and the composition and content of the crude dihydric phenol (240-310 ℃ fraction) obtained by the method are shown in Table 2.
TABLE 2 crude dihydric phenol component and content
| Components | Monohydric phenol | Dihydric phenols | Aromatic hydrocarbons | Alkane(s) | Heteroatom compounds |
| Content (%) | 4.78 | 70.53 | 14.31 | 7.13 | 3.25 |
And (3) purifying the dihydric phenol: extracting and removing monophenol, aromatic hydrocarbon, alkane, heteroatom compounds and other substances in the crude dihydric phenol by using a solvent B to obtain purified dihydric phenol, wherein the mass ratio of the solvent B to the crude dihydric phenol is 4: 1, the extraction temperature is 40 ℃. The solvent B is one or more of n-hexane, cyclohexane, n-heptane and petroleum ether, and in this embodiment, n-hexane. The purified dihydric phenol obtained by the method has the components and contents shown in Table 3.
TABLE 3 purified dihydric phenol component and content
| Components | Monohydric phenol | Dihydric phenols | Aromatic hydrocarbons | Alkane(s) | Heteroatom compounds |
| Content (a) of | 0.72 | 98.03 | 0.85 | 0.37 | 0.03 |
And (3) solvent recovery: and recovering the solvent B from the extraction solvent obtained by distilling the extract under reduced pressure, thereby realizing the reutilization of the solvent B. The solvent recovery rate of the solvent B reaches over 99.5 percent after the solvent B is repeated for five times. The mixture of the oils (the monophenol, the aromatic hydrocarbon, the alkane, the heteroatom compounds and a small amount of dihydric phenol extracted from the crude dihydric phenol) after the agent removal is sent to the subsequent hydrogenation treatment.
Refining and purifying the benzenediol: refining the purified dihydric phenol, and rectifying according to different boiling points to obtain various dihydroxybenzene products, such as catechol 245 deg.C, resorcinol 276.5 deg.C, hydroquinone 287 deg.C, and 4-methyl catechol 251 deg.C.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (10)
1. A system for extracting dihydric phenol from wastewater is characterized by comprising,
the pretreatment unit is used for carrying out oil removal, deacidification and deamination treatment on the wastewater to be treated;
the extraction unit comprises a phenol oil extraction device, a first agent removing tower and a dihydric phenol purification device, wherein the phenol oil extraction device and the first agent removing tower are communicated; wherein the phenol oil extraction device is connected with the pretreatment unit;
and the fraction cutting unit is respectively connected with the first agent removing tower and the dihydric phenol purifying device.
2. The system for extracting dihydric phenol from wastewater as set forth in claim 1, further comprising a rectification unit connected to said dihydric phenol purification apparatus.
3. The system for extracting dihydric phenol from wastewater according to claim 1, wherein the pretreatment unit comprises an oil interceptor, a deacidification tower and a deamination tower connected in sequence.
4. The system for extracting dihydric phenol from wastewater according to any one of claims 1 to 3, wherein the top of the phenol oil extraction device is provided with an oil phase outlet, the bottom is provided with a dephenolized wastewater outlet, and the oil phase outlet is connected with an inlet of the first dephenolizing tower.
5. The system for extracting dihydric phenol from wastewater according to any one of claims 1 to 3, wherein the first solvent outlet is provided at the top of the first desiccant tower, and the phenol oil outlet is provided at the bottom of the first desiccant tower, and the phenol oil outlet is connected to the distillate cut unit.
6. The system for extracting dihydric phenol from wastewater according to claim 5, further comprising a first solvent storage tank connected to the first solvent outlet and the phenol oil extraction device, respectively.
7. The system for extracting dihydric phenol from wastewater according to any one of claims 1 to 3, further comprising a second reagent removing column, wherein a feed inlet of the second reagent removing column is connected to a solvent outlet of the dihydric phenol purifying apparatus.
8. The system for extracting dihydric phenol from wastewater according to claim 7, further comprising a second solvent storage tank connected to the second desiccant tower and the dihydric phenol purification apparatus, respectively.
9. The system for extracting dihydric phenol from wastewater according to any one of claims 1 to 3, wherein the cut-off unit comprises a fractionating tower provided with a light fraction outlet, an intermediate fraction outlet and a heavy fraction outlet, wherein the intermediate fraction outlet is connected with the dihydric phenol purifying device.
10. The system for extracting dihydric phenol from wastewater according to any one of claims 1 to 3, wherein the phenol oil extraction device is a phenol oil extraction tower, a pipeline mixer or a combination of a mixing tank and a separation tank;
the dihydric phenol purification device is a dihydric phenol purification tower, a pipeline mixer or a combination of a mixing tank and a separation tank.
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