CN112794475A

CN112794475A - Oil-containing phenol water separation process method

Info

Publication number: CN112794475A
Application number: CN202011566058.4A
Authority: CN
Inventors: 傅敏燕; 丁烙勇
Original assignee: SHANGHAI ZEMAG MINDAC MACHINERY EQUIPMENT CO LTD
Current assignee: SHANGHAI ZEMAG MINDAC MACHINERY EQUIPMENT CO LTD
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-05-14

Abstract

The invention relates to the field of phenol water treatment after heat exchange cooling and decompression expansion from a coal chemical industry main process conversion cooling working section, and provides an oil-containing phenol water separation process method, which comprises the following steps: (1) introducing oil-containing phenol water into an oil separator, separating oil in the phenol water by the oil separator, and allowing the oil to flow to an external oil overflow regulating device through an internal fixed overflow device and then flow into an oil groove by virtue of gravity; (2) the phenol water treated by the oil separator is further introduced into a first buffer tank and a second buffer tank for buffering and temporary storage, and oil in the phenol water is further removed; (3) the phenol water treated by the first buffer tank and the second buffer tank is sequentially introduced into the first multiplication separator and the second multiplication separator; (4) and the phenol water treated by the second multiplication separator passes through a plurality of filters and is finally introduced into a settling tank for standing storage.

Description

Oil-containing phenol water separation process method

Technical Field

The invention relates to the field of phenol water treatment, in particular to a process method for separating oil-containing phenol water.

Background

The phenol water separation device for crushed coal pressure gasification generally adopts the processes of cooling, decompression expansion and gravity settling to separate dissolved gas and oil in phenol water for oil-containing phenol water from a coal chemical industry main process conversion cooling section. An oil separator is mainly arranged in the flow of the device to separate oil products. The phenol water is sent into the steady flow cylinder from the upper part of the tank wall of the oil separator and then enters a separation zone, a floating zone and a settling zone. In the upper floating area, the medium oil and water are naturally discharged out of the oil separator along a central overflow groove through a pipeline. The underwater dust and tar (brought by incompletely separated dust and tar in the mixing of the oil-containing phenol water) at the bottom of the settling zone are stirred by the scraper device and scraped to a slag outlet at the bottom, and then are discharged out of the tank body. For the separation of oil-containing phenol water, the traditional process adopts a four-stage separation procedure, such as four-stage separation of an oil separator, a buffer tank, a settling tank and a filter, and is affected by incomplete separation of dust-containing tar, the oil content after separation is still high, the separation effect is poor, and the adaptability is also poor; under the working condition of gasifying easily pulverized materials, the oil content in the phenol water is greatly increased, and the traditional process is not suitable.

Disclosure of Invention

On the basis of the common general knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily without departing from the concept and the protection scope of the invention.

In order to solve the technical problem, the invention provides a process for separating oil-containing phenol water, which at least comprises the following steps:

(1) introducing oil-containing phenol water into an oil separator, separating oil in the phenol water by the oil separator, and allowing the oil to flow to an external oil overflow regulating device through an internal fixed overflow device and then flow into an oil groove by virtue of gravity;

(2) the phenol water treated by the oil separator is further introduced into a first buffer tank and a second buffer tank with effective separation functions for separation and buffer temporary storage, and oil in the phenol water is further removed;

(3) the phenol water treated by the first buffer tank and the second buffer tank is sequentially introduced into a first multiplication separator and a second multiplication separator, and the size of oil droplets in the phenol water is increased and further separated from the phenol water through the separation effect of the multiplication separators;

(4) the phenol water treated by the second multiplication separator passes through a plurality of filters and is finally introduced into a settling tank for standing storage;

(5) the phenol water treated by the first multiplication separator further comprises the following steps before being introduced into the second multiplication separator:

introducing the phenol water treated by the first multiplying separator into a medicine adding tank, and adding a medicament into the medicine adding tank to separate bound oil in the phenol water into an oil phase and a water phase; and (4) the phenol water after being treated by the medicament enters a second multiplier separator for treatment.

The dosing tank is used for separating the combined oil in the phenol water by adding a medicament, and comprises a dosing tank body, and a stirrer, a dosing device and a pH value adjusting device which are arranged on the dosing tank body, wherein the rotating speed of the stirrer is generally 20-50 rpm.

As a preferred technical solution, in the step (5): the method for removing the bound oil in the phenolic water by the medicament comprises the following steps: a) adjusting the pH value of the medicament to 8-9.5 by using soda ash; b) adding water into the PAM and PAC medicaments according to the mass ratio of 1:1.5 to dissolve the PAM and PAC medicaments into liquid, adding 10-30 times of clear water to dilute the liquid into the liquid to obtain the liquid with the required concentration, and adding and stirring the liquid and the liquid by using a dosing device of a dosing tank; c) the dosage can be determined according to different turbidity degrees of the raw water, and when the turbidity degree of the raw water is 100-500mg/L, the dosage per kiloton is 10-20 kg; d) and the tiny oil drops are gathered and amplified by a second multiplication separator, and then can be separated from the phenol water.

As a preferred technical scheme, after the phenol water passes through the second multiplication separator and before entering the filter, the method further comprises the following steps: detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and the phenol water treated by the second multiplication separator is returned to the first multiplication separator for treatment again when the position of the stop valve is higher than the position of the stop valve F, and the ratio of the medicament to be added into the medicament adding tank is adjusted.

As a preferred technical scheme, after the phenol water passes through the second multiplication separator and before entering the filter, the method further comprises the following steps: detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and if the pressure is higher than the preset pressure, opening a stop valve D, and returning the phenol water treated by the second multiplying separator to the oil separator for separation again.

As a preferred technical scheme, after the phenol water passes through the second multiplication separator and before entering the filter, the method further comprises the following steps: detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and (4) returning the phenol water treated by the second multiplication separator to the first buffer tank for separation again when the stop valve E is opened.

As a preferred technical scheme, the oil-containing phenol water separation process is operated by an oil-containing phenol water separation device; the oil-containing phenol water separation device is sequentially provided with an oil separator 1, a first buffer tank 201, a second buffer tank 202, a first multiplication separator 3, a second multiplication separator 7, a plurality of filters 4 and a settling tank 5 along the direction of a pipeline; the first multiplying separator 201 and the second multiplying separator 202 are respectively provided with a shell 30 at the outer part; the bottoms of the first buffer tank 201 and the second buffer tank 202 are respectively conical bottoms, and scrapers are arranged in the conical bottoms; the bottom of the inner layer of the first buffer tank 201 and the bottom of the inner layer of the second buffer tank 202 are respectively provided with a scraper 22; the first buffer tank 201 and the second buffer tank 202 are connected in series or in parallel through pipe valve assemblies; the phenol water treated by the second multiplication separator 7 is led into the settling tank 5 through a plurality of filters for standing and storage, the number of the filters 4 is at least one, and the filters 4 are connected in parallel or in series when the number is more than 1.

As a preferable technical solution, the first multiplying separator 3 and the second multiplying separator 7 are provided with a feeding gradually expanding mouth 300, a cyclone 301, a packed bed 302, a special plate group 303 and a discharging area 304 from left to right in sequence; the top of the discharging area 304 is provided with a light phase outlet 304-1; the bottom of the discharging area is provided with a heavy phase outlet 304-2; the bottom of the left side of the packed bed 302 is provided with a first overflow plate 306; a second overflow plate 307 is arranged at the bottom of the right side of the packed bed 302 and on the left side of the special plate group; a third overflow plate 308 is arranged on the right side of the special plate group 303; the feeding flaring has the function of decelerating and separating phenol water; the cyclone has the function of centrifugally separating oil drops in the phenol water; the packed bed has the function of increasing the size of oil drops in the phenol water by collision; the special plate group is provided with hook-shaped baffles with the front and rear gaps sequentially reduced, and has the functions of collecting oil droplets and increasing the size of the oil droplets.

As a preferable technical solution, the second overflow plate 307 is a semicircular baffle, and the bottom of the second overflow plate is provided with a first opening 307-1; the third overflow plate 308 and the top of the shell 30 form an upper opening 308-1; the third overflow plate 308 forms a lower opening 308-2 with the bottom of the housing 30.

As a preferable mode, an oil discharge port 305 is provided between the first overflow plate 306 and the cyclone 301.

As a preferable technical solution, a first pipe 901, a pump 10, a second pipe 902, and a third pipe 903 are sequentially disposed on a pipeline between the heavy phase outlet 304-2 of the second multiplying separator 7 and the filter 4; the first pipe fitting 901, the second pipe fitting 902 and the third pipe fitting 903 are all tee pipe fittings; the third pipe orifice of the first pipe fitting 901 is connected with the feed opening of the second buffer tank 202 through a pipeline; the third pipe orifice of the second pipe 902 is connected with the discharge hole of the oil separator 1 through a second return pipe 112; the third pipe orifice of the third pipe 903 is connected with the feed inlet of the oil separator 1 through the first return pipe 111.

As a preferable technical solution, a fourth pipe 904 is further disposed on the first return pipe 111; the fourth pipe 904 is a tee pipe; the third orifice of the fourth conduit 904 is connected to the feed divergent orifice of the first multiplying separator 3 via a third return conduit 113.

As a preferable technical solution, a balance pipe 8 is arranged between the conical bottoms of the first buffer tank 201 and the second buffer tank 202, the balance pipe 8 is provided with a viewing mirror, a sampling port and a stop valve, an overflow port of the first buffer tank 201 is connected with an overflow port of the second buffer tank 202 through a pipeline, and a stop valve C is arranged on a pipeline between the overflow port of the first buffer tank 201 and the overflow port of the second buffer tank 202; a stop valve B is arranged on a pipeline between the feed inlet of the first buffer tank 201 and the feed inlet of the second buffer tank 202; a stop valve D is arranged on the first return pipe 111; a stop valve E is arranged on the second return pipe 112; a shut-off valve F is provided in the third return pipe 113.

As a preferred technical scheme, the oil-containing phenol water generated under the working condition of sudden increase of the oil content of the gasified raw material can be directly introduced into a first multiplication separator after heat exchange, temperature reduction and decompression expansion of the oil-containing phenol water, and then is sent into a settling tank for standing and storage after being filtered by an oil separator, a first buffer tank, a second buffer tank, a medicine adding tank, a second multiplication separator and a filter; and according to the detection of the oil content, the series-parallel connection of the dosing, the buffer tank and the filter can be flexibly adjusted at any time, so that the aim of effectively separating free oil from combined oil is fulfilled.

Compared with the prior art, the invention has the following remarkable advantages and effects:

(1) according to the oil-containing phenol water separation process method provided by the invention, the oil-containing phenol water sequentially passes through the oil separator, the first buffer tank, the second buffer tank, the first additional separator, the second additional separator, the filter and the settling tank, so that the separation stage number of the oil-containing phenol water is increased to 8, the oil separation of the oil-containing phenol water is not affected by incomplete separation of tar and dust of the dust-containing phenol water, the oil is fully separated, the quality of the finally obtained phenol water is ensured, and a good foundation is laid for the treatment of a downstream working section.

(2) According to the process for separating the oil-containing phenol water, the filter is arranged in front of the settling tank, the condition that the temperature of phenol water in an out-of-range area periodically fluctuates and rises due to backwashing can be effectively eliminated, the amount of the phenol water stored in the settling tank is large, the temperature fluctuation of the phenol water during backwashing of the filter has small influence on the whole phenol water, and the temperature of the phenol water in the settling tank is small.

(3) The oil-containing phenol water separation process method is provided with two buffer tanks with separation functions, and the two multiplication separators and the series-parallel connection of a plurality of filters flexibly and pertinently adjust the separation process flow and the separation technology so as to better cope with the phenol water amount fluctuation and the oil content fluctuation of the raw materials; the flexible arrangement of the plurality of buffer tanks, the multiplication separator and the filter obviously increases the separation efficiency, so that the integral device achieves the separation effect of 5-level or even 8-level, and can effectively separate the oil-containing phenol water generated along with the working condition of great fluctuation of the content of the gasified raw oil; the buffer tank is provided with a conical bottom, the stirrer is arranged at the bottom, the buffer tank can have a certain separation function, the scraper is arranged at the upper part of the buffer tank and can scrape floating dust or floating dust on the liquid surface, and the buffer tank has the function of effectively separating possible oil from phenol water temporarily stored in the buffer tank;

(4) in the invention, a feeding gradually-expanding opening, a cyclone, a packed bed, a special plate group and a discharging area are sequentially arranged in the multiplication separator from left to right; a light phase outlet is formed in the top of the discharging area; the bottom in ejection of compact district is provided with the heavy phase export, the bottom is provided with first overflow board, the second overflow board, the third overflow board, the separation that can be very big is less than 100 microns free state oil in the phenol water, make the oil phase in the phenol water can be enlarged on the one hand, thereby easier obtaining the separation, on the other hand makes in the rapid processing process, the dirty tar of not in time separation processing (if have) or other similar impurity (if have) can be followed this oil drain port and in time discharged, the influence of impurity to subsequent equipment has been avoided. The arrangement of the medicine adding tank and the second multiplied separator enables the combined oil which is difficult to remove by physical means to be separated into oil phase and water phase by means of adding the medicine, and then the separated oil phase is removed again by the second multiplied separator.

(5) In the process method, the material returning operation is set, so that the oil phase content in the phenol water exceeds the standard, the phenol water can be pumped to an upstream multiplication separator or an oil separator or a buffer tank, and the phenol water can be treated and reprocessed after being regulated by the dosage in the dosage tank.

(6) The method is characterized in that oil-containing phenol water generated under the working condition of sudden increase of oil content in gasified raw materials can be directly introduced into a first multiplication separator after heat exchange, temperature reduction and decompression expansion, and then is sent into a settling tank for standing and storage after being filtered by an oil separator, a first buffer tank, a second buffer tank, a medicine adding tank, a second multiplication separator and a filter; and according to the detection of the oil content, the series-parallel connection of the dosing, the buffer tank and the filter can be flexibly adjusted at any time, so that the aim of effectively separating free oil from combined oil is fulfilled.

Drawings

FIG. 1 is a schematic structural diagram of a separation device used in the oil-containing phenol water separation process described in the first embodiment.

FIG. 2 is a schematic structural diagram of a separation device used in the process for separating water containing oil and phenol according to the third embodiment.

FIG. 3 is a schematic diagram of a multiplying separator according to the present invention.

Fig. 4 is a schematic structural view of the first overflow plate.

Fig. 5 is a schematic structural view of the second overflow plate.

Fig. 6 is a schematic structural view of a third overflow plate.

The labels in the figure are in order:

1 is an oil separator; 201 is a first buffer tank; 202 is a second buffer tank; 21-stirring shaft, 22-scraper blade, 23-scraper blade; 3 is a first multiplying separator; 4 is a filter; 5 is a settling tank; 6 is a medicine adding tank; 7 is a second multiplying separator; 8 is a balance tube; (ii) a 11-a sampling port; 901 is a first pipe; 902 is a second tubular; 903 is a third pipe; 904 is a fourth tubular; 10 is a pump; 111 is a first return pipe; 112 is a second return pipe; 113 is a third return pipe; a is a stop valve A; b is a stop valve B; c is a stop valve C; d is a stop valve D; e is a stop valve E; f is a stop valve F; 81-tee A, 82-tee B; 86-a first bypass line; 87-second bypass line.

Wherein each symbol in fig. 3-6 represents the following meaning:

30 is a shell; 300 is a feeding flaring; 301 is a swirler; 302 is a packed bed; 303 is a special plate group; 303-1 is a hook-shaped baffle; 304 is a discharge area; 304-1 is a light phase outlet; 304-2 is a heavy phase outlet; 305 is an oil drain port; 306 is a first overflow plate; 307 is a second overflow plate; 307-1 is a first opening; 308 is a third overflow plate; 308-1 is an upper opening; 308-2 is a lower opening.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on structures shown in the drawings, and are only used for convenience in describing the present invention, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the technical scheme, the terms "first" and "second" are only used for referring to the same or similar structures or corresponding structures with similar functions, and are not used for ranking the importance of the structures, or comparing the sizes or other meanings.

In addition, unless expressly stated or limited otherwise, the terms "mounted" and "connected" are to be construed broadly, e.g., the connection may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two structures can be directly connected or indirectly connected through an intermediate medium, and the two structures can be communicated with each other. To those skilled in the art, the specific meanings of the above terms in the present invention can be understood in light of the present general concepts, in connection with the specific context of the scheme.

The oil-containing phenol water is discharged from the gasification reaction section, expanded to slightly higher than atmospheric pressure in the oil-containing phenol water expander, then flows into the oil separator through the liquid seal leg by means of gravity, and is separated by the oil-containing phenol water separation process method.

The invention provides a process method for separating oil-containing phenol water, which at least comprises the following steps:

(2) the phenol water treated by the oil separator is further introduced into a first buffer tank and a second buffer tank for buffering and temporary storage, and oil in the phenol water is further removed;

(3) the phenol water treated by the first buffer tank and the second buffer tank is sequentially introduced into a first multiplication separator and a second multiplication separator, and the oil droplets in the phenol water are increased in size and further separated from the phenol water under the separation action of the two multiplication separators;

In some embodiments, in step (5): the method for removing the bound oil in the phenolic water by the medicament comprises the following steps: a) adjusting the pH value of the medicament to 8-9.5 by using soda ash; b) adding water into the PAM and PAC medicaments according to the mass ratio of 1:1.5 to dissolve the PAM and PAC medicaments into liquid, adding 10-30 times of clear water to dilute the liquid into the liquid to obtain the liquid with the required concentration, and adding and stirring the liquid and the liquid by using a dosing device of a dosing tank; c) the dosage can be determined according to different turbidity degrees of raw water, and the dosage is 10-20kg per kiloton when the turbidity degree of the raw water is generally 100-500 mg/L; d) and the tiny oil drops are gathered and amplified by a second multiplication separator, and then can be separated from the phenol water.

In some embodiments, the step of passing the phenol water treated by the first multiplication separator to the second multiplication separator further comprises the steps of: introducing the phenol water treated by the first multiplying separator into a medicine adding tank, and adding a medicament into the medicine adding tank to separate bound oil in the phenol water into an oil phase and a water phase; and (4) the phenol water after being treated by the medicament enters a second multiplier separator for treatment.

In some embodiments, the dosing tank is used for separating bound oil in phenol water by adding a medicament, and comprises a dosing tank body and an agitator, a dosing device and a pH value adjusting device which are arranged on the dosing tank body, wherein the rotation speed of the agitator is generally 20-50 rpm.

Wherein, the medicament is PAM and PAC, and the pH value of the medicament is adjusted to 8-9.5 by soda ash, and the medicament can effectively break the connecting bonds in the bound oil after being mixed into phenol water, so that the medicament is separated into water and oil. After the treatment of the medicine adding tank, the combined oil in the phenol water is converted into oil and water phases to exist independently, so that the tiny oil drops in the oil and water phases can be separated from the phenol water after being gathered and amplified by the second multiplication separator.

Wherein, the PAM is polyacrylamide and is a flocculating agent, and the rest physical properties are shown in GB 17514-2017; PAC is solid powdery polyaluminium chloride, is a clean load coagulant, has the functions of demulsification, color removal and COD reduction, and can refer to the drinking water grade standard: GB15892-2009, generally using the standard: GB/T22627-2008; the soda ash is NaOH. The dosage of the medicament is 0.1-0.3 ppm. In the step (5): the method for removing the bound oil in the phenolic water by the medicament comprises the following steps: a) adjusting the pH value of the medicament to 8-9.5 by using soda ash; b) adding water into the PAM and PAC medicaments according to the mass ratio of 1:1.5 to dissolve the PAM and PAC medicaments into liquid, adding 10-30 times of clear water to dilute the liquid into the liquid to obtain the liquid with the required concentration, and adding and stirring the liquid and the liquid by using a dosing device of a dosing tank; c) the dosage can be determined according to different turbidity degrees of the raw water, and when the turbidity degree of the raw water is 100-500mg/L, the dosage per kiloton is 10-20 kg; d) and the tiny oil drops are gathered and amplified by a second multiplication separator, and then can be separated from the phenol water.

In the invention, a sensor for detecting the content of the combined oil in the phenol water is arranged on the water outlet side of the second multiplying separator, namely the heavy phase outlet side of the second multiplying separator, the data detected by the sensor is converted into a content value of the combined oil after being processed, when the value is higher than a preset threshold value, the content of the combined oil is over high, namely the treatment of the combined oil in the phenol water by the pesticide is not thorough, the phenol water with unqualified separation of the combined oil needs to be returned by a pump, and then the returned material of the first return pipe or the second return pipe or the third return pipe is processed until the content of the combined oil in the phenol water detected by the sensor reaches the standard, namely is lower than the preset threshold value, and at the moment, a downstream valve is opened to allow the phenol water to.

In some embodiments, after the phenol water passes through the second multiplied separator and before entering the filter, the method further comprises the following steps: detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and if the ratio of the phenol water to the chemical agent is higher than the preset value, the stop valve F is opened, the phenol water treated by the second multiplication separator is returned to the first multiplication separator for treatment again, and the ratio of the chemical agent to the chemical agent feeding tank is adjusted.

In some embodiments, after the phenol water passes through the second multiplied separator and before entering the filter, the method further comprises the following steps: detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and if the pressure is higher than the preset pressure, opening a stop valve D, and returning the phenol water treated by the second multiplying separator to the oil separator for separation again.

In some embodiments, after the phenol water passes through the second multiplied separator and before entering the filter, the method further comprises the following steps: detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value, if so, carrying out the next step, and introducing into a filter; otherwise, opening the stop valve E, and returning the phenol water treated by the second multiplication separator to the first buffer tank for separation again.

In some embodiments, operating the oleophenolic water separation process by an oleophenolic water separation unit; the oil-containing phenol water separation device is sequentially provided with an oil separator 1, a first buffer tank 201, a second buffer tank 202, a first multiplication separator 3, a second multiplication separator 7, a plurality of filters 4 and a settling tank 5 along the direction of a pipeline; the first multiplying separator 201 and the second multiplying separator 202 are respectively provided with a shell 30 at the outer part;

the bottoms of the first buffer tank 201 and the second buffer tank 202 are respectively conical bottoms, and scrapers are arranged in the conical bottoms; the bottom of the inner layer of the first buffer tank 201 and the bottom of the inner layer of the second buffer tank 202 are respectively provided with a scraper 22; the first buffer tank 201 and the second buffer tank 202 are connected in series or in parallel through pipe valve assemblies;

the phenol water treated by the second multiplication separator 7 is led into the settling tank 5 through a plurality of filters for standing and storage, the number of the filters 4 is at least one, and the filters 4 are connected in parallel or in series when the number is more than 1.

In some embodiments, the first multiplier separator 3 and the second multiplier separator 7 are provided with a feed flaring 300, a cyclone 301, a packed bed 302, a special plate group 303 and a discharge area 304 from left to right; the top of the discharging area 304 is provided with a light phase outlet 304-1; the bottom of the discharging area is provided with a heavy phase outlet 304-2; the bottom of the left side of the packed bed 302 is provided with a first overflow plate 306; a second overflow plate 307 is arranged at the bottom of the right side of the packed bed 302 and on the left side of the special plate group; a third overflow plate 308 is arranged on the right side of the special plate group 303; the feeding flaring has the function of decelerating and separating phenol water; the cyclone has the function of centrifugally separating oil drops in the phenol water; the packed bed has the function of increasing the size of oil drops in the phenol water by collision; the special plate group is provided with hook-shaped baffles with the front and rear gaps sequentially reduced, and has the functions of collecting oil droplets and increasing the size of the oil droplets.

In some embodiments, the second overflow plate 307 is a semicircular baffle, and the bottom of the second overflow plate is provided with a first opening 307-1; the third overflow plate 308 and the top of the shell 30 form an upper opening 308-1; the third overflow plate 308 forms a lower opening 308-2 with the bottom of the housing 30.

In some embodiments, the pipeline between the heavy phase outlet 304-2 of the second incremental separator 7 and the filter 4 is provided with a first pipe 901, a pump 10, a second pipe 902, and a third pipe 903 in sequence; the first pipe fitting 901, the second pipe fitting 902 and the third pipe fitting 903 are all tee pipe fittings; the third pipe orifice of the first pipe fitting 901 is connected with the feed opening of the second buffer tank 202 through a pipeline; the third pipe orifice of the second pipe 902 is connected with the discharge hole of the oil separator 1 through a second return pipe 112; the third pipe orifice of the third pipe 903 is connected with the feed inlet of the oil separator 1 through the first return pipe 111.

In some embodiments, a fourth pipe 904 is further disposed on the first return pipe 111; the fourth pipe 904 is a tee pipe; the third orifice of the fourth conduit 904 is connected to the feed divergent orifice of the first multiplying separator 3 via a third return conduit 113.

Wherein the first overflow plate closes a lower portion of the multiplied separator housing cross-section to allow the phenol water to overflow through an upper portion of the first overflow plate; the second overflow plate is a semicircular baffle plate, and the bottom of the second overflow plate is provided with an opening as a circulating hole so that the water phase overflows from the upper part of the second overflow plate and passes through the circulating hole and the oil phase passes through the circulating hole; a third overflow plate closes the middle of the inner cross section of the separator housing to allow the aqueous phase and the oil phase to pass through the upper and lower portions of the third overflow plate, respectively.

In some embodiments, the bottoms of the first buffer tank 201 and the second buffer tank 202 are respectively conical bottoms, and a scraper 23 is arranged inside the first buffer tank and the second buffer tank for scraping floating oil on the liquid surface; a stirrer is arranged at the bottom of the inner layer of the buffer tank; the first buffer tank 201 and the second buffer tank 202 are connected in series or in parallel through pipe valve assemblies; and the outer bottom walls of the first buffer tank and the second buffer tank are provided with steam coils.

In some embodiments, a balance pipe 8 is arranged between the conical bottoms of the first buffer tank 201 and the second buffer tank 202, a viewing mirror, a sampling port and a stop valve are arranged on the balance pipe 8, the overflow port of the first buffer tank 201 is connected with the overflow port of the second buffer tank 202 through a pipeline, and a stop valve C is arranged on the pipeline between the overflow port of the first buffer tank 201 and the overflow port of the second buffer tank 202; a stop valve B is arranged on a pipeline between the feed inlet of the first buffer tank 201 and the feed inlet of the second buffer tank 202; a stop valve D is arranged on the first return pipe 111; a stop valve E is arranged on the second return pipe 112; a shut-off valve F is provided in the third return pipe 113.

Example one

The oil-containing phenol water separation process method is operated by an oil-containing phenol water separation device; the oil-containing phenol water separation device is sequentially provided with an oil separator 1, a first buffer tank 201, a first multiplying separator 3, a chemical adding tank 6, a second multiplying separator 7, a plurality of filters 4 and a settling tank 5 along the direction of a pipeline; the first multiplying separator 201 and the second multiplying separator 202 are respectively provided with a shell 30 at the outer part;

the bottoms of the first buffer tanks 201 and the second buffer tanks are respectively conical bottoms, and scrapers are arranged in the first buffer tanks; the bottom of the inner layer of the first buffer tank 201 is respectively provided with a scraper 22; the first buffer tank 201 is connected in series or in parallel through a pipe valve assembly; in this embodiment, a scraper for scraping floating oil or floating dust on the liquid surface is installed at the upper part in the first buffer tank 201, and the scraper is fixedly installed on the stirring shaft. Correspondingly, overflow ports are respectively formed in the side wall of the first buffer tank 201, so that floating oil swept by the scraper flows out of the buffer tank through the overflow ports, and the oil content in the phenol water is reduced.

The process for separating the oil-containing phenol water at least comprises the following steps:

(2) the phenol water treated by the oil separator is further introduced into a first buffer tank for buffering and temporary storage, and the oil in the phenol water is further removed; set up the (mixing) shaft in the first buffer tank, this (mixing) shaft is through fixing the rotatable center department of installing at the buffer tank of the support of first buffer tank, and the scraper is then fixed mounting so that the scraper is along with the rotation of (mixing) shaft with the whole or partial scraping of impurity or the oil of adhesion on first buffer tank and the second buffer tank diapire on the (mixing) shaft. The stirring shaft is provided with a stirring support which can rotate along with the stirring shaft, the tail end of the stirring support is lapped on the annular rail to enable the stirring support to move along the circumferential direction of the annular rail, a motor and a speed reducer are fixedly arranged on the stirring support, and a gear meshed with the gear ring is arranged on the speed reducer, so that the gear on the speed reducer is meshed with the gear ring to drive the stirring support and the stirring shaft to rotate, and the scraper 22 on the stirring shaft works. Simultaneously, stirring paddle can also be installed on the stirring shaft to make the oil in the first buffer tank evenly subside. In order to prevent oil and/or impurity from solidifying on the diapire of first buffer tank, in this embodiment, install steam coil respectively on the outer diapire of first buffer tank, heat the diapire of first buffer tank through steam coil, make the oil of its adhesion keep better mobility all the time.

(3) The phenol water treated by the first buffer tank is sequentially introduced into a first multiplication separator and a second multiplication separator, and the size of oil droplets in the phenol water is increased and further separated from the phenol water under the separation effect of the two multiplication separators; the first multiplication separator 3 and the second multiplication separator 7 are internally provided with a feeding gradually-expanding mouth 300, a cyclone 301, a packed bed 302, a special plate group 303 and a discharging area 304 from left to right in sequence; the top of the discharging area 304 is provided with a light phase outlet 304-1; the bottom of the discharging area is provided with a heavy phase outlet 304-2; the bottom of the left side of the packed bed 302 is provided with a first overflow plate 306; a second overflow plate 307 is arranged at the bottom of the right side of the packed bed 302 and on the left side of the special plate group; the right side of the special plate group 303 is provided with a third overflow plate 308. The second overflow plate 307 is a semicircular baffle, and the bottom of the second overflow plate is provided with a first opening 307-1; the third overflow plate 308 and the top of the shell 30 form an upper opening 308-1; the third overflow plate 308 forms a lower opening 308-2 with the bottom of the housing 30. The first overflow plate closes the lower part of the cross section of the multiplied separator shell so as to enable phenol water to overflow from the upper part of the first overflow plate; the second overflow plate is a semicircular baffle plate, and the bottom of the second overflow plate is provided with an opening as a circulating hole so that the water phase overflows from the upper part of the second overflow plate and passes through the circulating hole and the oil phase passes through the circulating hole; a third overflow plate closes off the middle of the internal cross-section of the separator housing to allow the passage of the water and oil phase from the upper and lower parts of the third overflow plate, respectively (as shown in figures 3-6).

Wherein, the swirler is opposite to the inlet so as to lead the phenol water flowing into the separator tank body to be centrifugally separated. An oil discharge port 305 is provided between the first overflow plate 306 and the cyclone 301.

Wherein the packed bed is a fiber packing, the fiber packing is filled in the packed bed to increase the size of oil droplets in the phenol water, and the fiber packing can be a loose fiber bed.

Wherein, a plurality of hook-shaped baffles 303-1 with sequentially reduced front and back gaps are arranged in the special plate group, and the hook-shaped baffles 303-1 are arranged in the special plate group to increase the size of oil droplets in the phenol water. The special plate group 303 comprises a plurality of straight plates or bent plates which are arranged in a stacked mode with certain gaps between the straight plates or the bent plates, and a certain inclination angle is formed between the straight plates and the flowing direction of liquid, so that the straight plates or the bent plates can partially block the fluid but allow the fluid to pass through, and oil drops among tiny oil drops collide with each other and are gathered into oil drops with larger sizes through the blocking effect; and in the flowing direction of the fluid, a plurality of groups of special plate groups can be arranged to further increase the gathering effect on oil drops, so that the suspended oil drops in the phenol water are gathered into large liquid drops as much as possible, and then separated from the water and flow out from the heavy phase outlet, and the phenol water flows out from the light phase outlet.

(4) And the phenol water treated by the second multiplication separator passes through a plurality of filters and is finally introduced into a settling tank for standing storage. And the phenol water treated by the second multiplication separator is introduced into a settling tank through a plurality of filters for standing and storage, wherein the number of the filters is one. And the phenol water treated by the second multiplication separator is pumped into a filter for filtering so as to further remove oil in the phenol water. In the present embodiment, the filter 4 is divided into 3 layers including a coke layer (filter medium), a sand layer, and a support stone layer. During filtering, the phenol water flows out after sequentially passing through the coke layer, the sand layer and the support stone layer. The phenol water treated by the filter is then stored in the settling tank 5 in a centralized way, and at the moment, the settling tank 5 can be used for standing separation by means of larger capacity, so that a very small amount of particles and oil contained in the phenol water are settled and floated out of the phenol water, and the final separation is carried out.

introducing the phenol water treated by the first multiplying separator into a medicine adding tank, and adding a medicament into the medicine adding tank to separate bound oil in the phenol water into an oil phase and a water phase; and (4) the phenol water after being treated by the medicament enters a second multiplier separator for treatment. The dosing tank is used for separating the combined oil in the phenol water by adding a medicament, and comprises a dosing tank body, and a stirrer, a dosing device and a pH value adjusting device which are arranged on the dosing tank body, wherein the rotating speed of the stirrer is generally 20-50 rpm.

As shown in fig. 1.

In the step (5): the method for removing the bound oil in the phenolic water by the medicament comprises the following steps: a) adjusting the pH value of the medicament to 8-9.5 by using soda ash; b) adding water into the PAM and PAC medicaments according to the mass ratio of 1:1.5 to dissolve the PAM and PAC medicaments into liquid, adding 10-30 times of clear water to dilute the liquid into the liquid to obtain the liquid with the required concentration, and adding and stirring the liquid and the liquid by using a dosing device of a dosing tank; c) the dosage can be determined according to different turbidity degrees of the raw water, and when the turbidity degree of the raw water is 100-500mg/L, the dosage per kiloton is 10-20 kg; d) and the tiny oil drops are gathered and amplified by a second multiplication separator, and then can be separated from the phenol water.

Wherein, the PAM is polyacrylamide and is a flocculating agent, and the rest physical properties are shown in GB 17514-2017; PAC is solid powdery polyaluminium chloride, is a clean load coagulant, has the functions of demulsification, color removal and COD reduction, and can refer to the drinking water grade standard: GB15892-2009, generally using the standard: GB/T22627-2008; the soda ash is NaOH. The dosage of the medicament is 0.1-0.3 ppm.

Example two

A process for separating oil-containing phenol water, as shown in FIG. 2, is operated by an oil-containing phenol water separation device; the oil-containing phenol water separation device is sequentially provided with an oil separator 1, a first buffer tank 201, a second buffer tank 202, a first multiplication separator 3, a second multiplication separator 7, a plurality of filters 4 and a settling tank 5 along the direction of a pipeline; the first multiplying separator 201 and the second multiplying separator 202 are respectively provided with a shell 30 at the outer part;

the bottoms of the first buffer tank 201 and the second buffer tank 202 are respectively conical bottoms, and scrapers are arranged in the conical bottoms; the bottom of the inner layer of the first buffer tank 201 and the bottom of the inner layer of the second buffer tank 202 are respectively provided with a scraper 22; the first buffer tank 201 and the second buffer tank 202 are connected in series or in parallel through pipe valve assemblies; in this embodiment, scrapers for scraping off floating oil on the liquid surface are installed at the upper portions of the first buffer tank 201 and the second buffer tank 202, and the scrapers are fixedly installed on the stirring shaft. Correspondingly, overflow ports are respectively formed in the side walls of the first buffer tank 201 and the second buffer tank 202, so that floating oil swept by the scraper flows out of the buffer tanks through the overflow ports, and the oil content in the phenol water is reduced.

Be provided with balanced pipe 8 between first buffer tank 201, the second buffer tank 202, be provided with sight glass, sample connection and stop valve on the balanced pipe 8, pass through the pipe connection between the overflow mouth of first buffer tank 201 and the overflow mouth of second buffer tank 202, be provided with stop valve C on the pipeline between the overflow mouth of first buffer tank 201 and the overflow mouth of second buffer tank 202.

(2) the phenol water treated by the oil separator is further introduced into a first buffer tank and a second buffer tank for buffering and temporary storage, and oil in the phenol water is further removed; the stirring shaft is arranged in the first buffer tank and the second buffer tank, the stirring shaft is rotatably arranged at the center of the buffer tank through a support fixed on the first buffer tank and the second buffer tank, and the scraper is fixedly arranged on the stirring shaft so that the scraper can completely or partially scrape off oil and possible impurities adhered to the bottom walls of the first buffer tank and the second buffer tank along with the rotation of the stirring shaft. The stirring shaft is provided with a stirring support which can rotate along with the stirring shaft, the tail end of the stirring support is lapped on the annular track to enable the stirring support to move circumferentially along the annular track, a motor and a speed reducer are fixedly arranged on the stirring support, and a gear meshed with the gear ring is arranged on the speed reducer, so that the gear on the speed reducer is meshed with the gear ring to drive the stirring support and the stirring shaft to rotate, and the scraper 22 on the stirring shaft works. Simultaneously, stirring paddle blades can be arranged on the stirring shaft, so that oil in the first buffer tank and the second buffer tank can be uniformly settled. In order to prevent the oil and/or the impurities from adhering to the bottom wall of the first buffer tank or the second buffer tank, in this embodiment, the steam coil pipes are respectively installed on the outer bottom walls of the first buffer tank and the second buffer tank, and the bottom wall of the first buffer tank or the second buffer tank is heated by the steam coil pipes, so that the oil and/or the impurities adhered to the bottom wall of the first buffer tank or the second buffer tank always keep good fluidity.

(3) The phenol water treated by the first buffer tank and the second buffer tank is sequentially introduced into a first multiplication separator and a second multiplication separator, and the oil droplets in the phenol water are increased in size and further separated from the phenol water under the separation action of the two multiplication separators; the first multiplication separator 3 and the second multiplication separator 7 are internally provided with a feeding gradually-expanding mouth 300, a cyclone 301, a packed bed 302, a special plate group 303 and a discharging area 304 from left to right in sequence; the top of the discharging area 304 is provided with a light phase outlet 304-1; the bottom of the discharging area is provided with a heavy phase outlet 304-2; the bottom of the left side of the packed bed 302 is provided with a first overflow plate 306; a second overflow plate 307 is arranged at the bottom of the right side of the packed bed 302 and on the left side of the special plate group; the right side of the special plate group 303 is provided with a third overflow plate 308. The second overflow plate 307 is a semicircular baffle, and the bottom of the second overflow plate is provided with a first opening 307-1; the third overflow plate 308 and the top of the shell 30 form an upper opening 308-1; the third overflow plate 308 forms a lower opening 308-2 with the bottom of the housing 30. The first overflow plate closes the lower part of the cross section of the multiplied separator shell so as to enable phenol water to overflow from the upper part of the first overflow plate; the second overflow plate is a semicircular baffle plate, and the bottom of the second overflow plate is provided with an opening as a circulating hole so that the water phase overflows from the upper part of the second overflow plate and passes through the circulating hole and the oil phase passes through the circulating hole; a third overflow plate closes the middle of the internal cross-section of the separator housing to allow the aqueous phase and the oily phase to pass through the upper and lower parts of the third overflow plate, respectively (as shown in figures 3-6).

Wherein, a plurality of hook-shaped baffles 303-1 are arranged in the special plate group, and the hook-shaped baffles 303-1 are arranged in the special plate group to increase the size of oil drops in the phenol water. The special plate group 303 comprises a plurality of straight plates or bent plates which are arranged in a stacked mode with certain gaps between the straight plates or the bent plates, and a certain inclination angle is formed between the straight plates and the flowing direction of liquid, so that the straight plates or the bent plates can partially block the fluid but allow the fluid to pass through, and oil drops among tiny oil drops collide with each other and are gathered into oil drops with larger sizes through the blocking effect; and in the flowing direction of the fluid, a plurality of groups of special plate groups can be arranged to further increase the gathering effect on oil drops, so that the suspended oil drops in the phenol water are gathered into large liquid drops as much as possible, and then separated from the water and flow out from the heavy phase outlet, and the phenol water flows out from the light phase outlet.

After the phenol water passes through the second multiplication separator and before entering the filter, the method further comprises the following steps: a sensor for detecting the content of the combined oil in the phenol water is arranged on one side of the outlet water of the second multiplying separator, namely the outlet side of the heavy phase of the second multiplying separator, and the content of the combined oil in the phenol water treated by the second multiplying separator is detected; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and if the ratio of the phenol water to the chemical agent is higher than the preset value, the stop valve F is opened, the phenol water treated by the second multiplication separator is returned to the first multiplication separator for treatment again, and the ratio of the chemical agent to the chemical agent feeding tank is adjusted.

Wherein, a first pipe fitting 901, a pump 10, a second pipe fitting 902 and a third pipe fitting 903 are sequentially arranged on the pipeline between the heavy phase outlet 304-2 of the second multiplying separator 7 and the filter 4; the first pipe fitting 901, the second pipe fitting 902 and the third pipe fitting 903 are all tee pipe fittings; the third pipe orifice of the first pipe fitting 901 is connected with the feed opening of the second buffer tank 202 through a pipeline; the third pipe orifice of the second pipe 902 is connected with the discharge hole of the oil separator 1 through a second return pipe 112; the third pipe orifice of the third pipe 903 is connected with the feed inlet of the oil separator 1 through the first return pipe 111. A fourth pipe 904 is further arranged on the first return pipe 111; the fourth pipe 904 is a tee pipe; the third orifice of the fourth conduit 904 is connected to the feed divergent orifice of the first multiplying separator 3 via a third return conduit 113. A stop valve D is arranged on the first return pipe; a stop valve E is arranged on the second return pipe; and a stop valve F is arranged on the third return pipe.

The data detected by the sensor is processed to be a content value of the bound oil, and when the content value is higher than a preset threshold value, the content of the bound oil is over high, namely the treatment of the bound oil in the phenol water by the medicament is not thorough. At the moment, the material returning pump works, the water inlet end of the material returning pump is connected with the heavy phase outlet of the second multiplication separator, the water outlet end of the material returning pump is connected with the feeding gradually-expanding opening of the first multiplication separator, the phenol water with unqualified bound oil separation can be returned and treated again, the medicament adding proportion only needs to be adjusted during the treatment again until the bound oil content in the phenol water detected by the sensor reaches the standard, namely the bound oil content is lower than the preset threshold value, and the downstream valve is opened to allow the phenol water to go to the filter.

EXAMPLE III

On the basis of the second embodiment, as shown in fig. 2, after the phenol water passes through the second multiplied separator and before entering the filter, the method further comprises the following steps: detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and (4) returning the phenol water treated by the second multiplication separator to the first buffer tank for separation again when the stop valve E is opened.

The data detected by the sensor is processed to be a content value of the bound oil, and when the content value is higher than a preset threshold value, the content of the bound oil is over high, namely the treatment of the bound oil in the phenol water by the medicament is not thorough. At the moment, the material returning pump works, the water inlet end of the material returning pump is connected with the heavy phase outlet of the second multiplying separator, the water outlet end of the material returning pump is connected with the discharge hole of the oil separator 1, phenol water with unqualified combined oil separation can be returned and treated again, only the adding proportion of the medicament needs to be adjusted during the treatment again until the content of the combined oil in the phenol water detected by the sensor reaches the standard, namely the content of the combined oil is lower than the preset threshold value, and the downstream valve is opened to allow the phenol water to go to the filter.

Example four

On the basis of the second embodiment, as shown in fig. 2, after the phenol water passes through the second multiplied separator and before entering the filter, the method further comprises the following steps: detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and if the pressure is higher than the preset pressure, opening a stop valve D, and returning the phenol water treated by the second multiplying separator to the oil separator for separation again.

The data detected by the sensor is processed to be a content value of the bound oil, and when the content value is higher than a preset threshold value, the content of the bound oil is over high, namely the treatment of the bound oil in the phenol water by the medicament is not thorough. At the moment, the material returning pump works, the water inlet end of the material returning pump is connected with the heavy phase outlet of the second multiplying separator, the water outlet end of the material returning pump is connected with the feed inlet of the oil separator 1, phenol water with unqualified combined oil separation can be returned and treated again, only the adding proportion of the medicament needs to be adjusted during the treatment again until the content of the combined oil in the phenol water detected by the sensor reaches the standard, namely the content of the combined oil is lower than the preset threshold value, and at the moment, the downstream valve is opened to allow the phenol water to go to the filter.

The method is characterized in that oil-containing phenol water generated under the working condition of sudden increase of oil content in gasified raw materials can be directly introduced into a first multiplication separator after heat exchange, temperature reduction and decompression expansion, and then is sent into a settling tank for standing and storage after being filtered by an oil separator, a first buffer tank, a second buffer tank, a medicine adding tank, a second multiplication separator and a filter; according to the detection of the oil content, the series-parallel connection of the dosing tank, the buffer tank and the filter can be flexibly adjusted at any time, so that the aim of effectively separating free oil from combined oil is fulfilled; a method for removing bound oil in phenol water by using a medicament.

The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions. The reagents and starting materials used in the present invention are commercially available.

Performance testing

Carrying out oil content detection on the oil-containing phenol water separation process method in the embodiment;

1. the time points of detection sampling are respectively as follows: (1) oil content before separation: sampling before the oil-containing phenol water enters an oil separator 1 of an oil-containing phenol water separation device for separation; (2) oil content after separation: the oil-containing phenol water is separated by a settling tank 5 of the oil-containing phenol water separation device and then sampled.

2. Comparative example: taking the traditional process as a comparison example, the traditional process is that the oil-containing phenol water sequentially enters an oil separator, a common buffer tank, a settling tank and a filter, and four-stage separation is carried out, namely the separation is finished.

3. The oil content detection method comprises the following steps: see HJ637-2018 water quality petroleum and animal and vegetable oil infrared spectrophotometry and MT/T358-1994 coal chloroform extract family component determination method.

The results are shown in Table 1.

TABLE 1 oil content separation Effect test

The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim the description of selected embodiments in the best possible combination contemplated. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.

Claims

1. A process for separating oil-containing phenol water is characterized by at least comprising the following steps:

(2) the phenol water treated by the oil separator is further introduced into a first buffer tank and a second buffer tank for separation and buffer temporary storage, and oil in the phenol water is further removed;

2. The process for separating oil-containing phenol water according to claim 1, wherein in the step (5): the method for removing the bound oil in the phenolic water by the medicament comprises the following steps: a) adjusting the pH value of the medicament to 8-9.5 by using soda ash; b) adding water into the PAM and PAC medicaments according to the mass ratio of 1:1.5 to dissolve the PAM and PAC medicaments into liquid, adding 10-30 times of clear water to dilute the liquid into the liquid to obtain the liquid with the required concentration, and adding and stirring the liquid and the liquid by using a dosing device of a dosing tank; c) the dosage can be determined according to different turbidity degrees of the raw water, and when the turbidity degree of the raw water is 100-500mg/L, the dosage per kiloton is 10-20 kg; d) and the tiny oil drops are gathered and amplified by a second multiplication separator, and then can be separated from the phenol water.

3. The process for separating oil-containing phenol water according to claim 2, wherein after passing through the second multiplying separator and before entering the filter, the process further comprises the steps of:

detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and the phenol water treated by the second multiplication separator is returned to the first multiplication separator for treatment again when the position of the stop valve is higher than the position of the stop valve F, and the ratio of the medicament to be added into the medicament adding tank is adjusted.

4. The process for separating oil-containing phenol water according to claim 2, wherein after passing through the second multiplying separator and before entering the filter, the process further comprises the steps of: detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and if the pressure is higher than the preset pressure, opening a stop valve D, and returning the phenol water treated by the second multiplying separator to the oil separator for separation again.

5. The process for separating oil-containing phenol water according to claim 2, wherein after passing through the second multiplying separator and before entering the filter, the process further comprises the steps of: detecting the content of the bound oil in the phenol water treated by the second multiplication separator; judging whether the content of the bound oil in the phenol water is higher than a preset threshold value or not, and if the content of the bound oil in the phenol water is lower than the preset threshold value, carrying out the next step and introducing into a filter; and (4) returning the phenol water treated by the second multiplication separator to the first buffer tank for separation again when the stop valve E is opened.

6. The process for separating water containing oil and phenol according to claim 1, wherein the process for separating water containing oil and phenol according to claim 1 is operated by a water containing oil and phenol separating device; the oil-containing phenol water separation device is sequentially provided with an oil separator, a first buffer tank, a second buffer tank, a first multiplication separator, a second multiplication separator, a plurality of filters and a settling tank along the direction of a pipeline; the first multiplication separator and the second multiplication separator are respectively provided with a shell outside;

the bottoms of the first buffer tank and the second buffer tank are respectively conical bottoms, and scrapers are arranged in the first buffer tank and the second buffer tank; scrapers are respectively arranged at the bottoms of the inner layers of the first buffer tank and the second buffer tank; the first buffer tank and the second buffer tank are connected in series or in parallel through pipe valve assemblies;

and the phenol water treated by the second multiplication separator is introduced into a settling tank through a plurality of filters for standing and storage, the number of the filters is at least one, and the filters are connected in parallel or in series when the number of the filters is more than 1.

7. The process method for separating the oil-containing phenol water as claimed in claim 2 or 6, wherein the first multiplying separator and the second multiplying separator are internally provided with a feeding gradually-expanding mouth, a cyclone, a packed bed, a special plate group and a discharging area from left to right in sequence; a light phase outlet is formed in the top of the discharging area; a heavy phase outlet is formed at the bottom of the discharging area; a first overflow plate is arranged at the bottom of the left side of the packed bed; a second overflow plate is arranged at the bottom of the right side of the packed bed and positioned on the left side of the special plate group; a third overflow plate is arranged on the right side of the special plate group; the feeding flaring has the function of decelerating and separating phenol water; the cyclone has the function of centrifugally separating oil drops in the phenol water; the packed bed has the function of increasing the size of oil drops in the phenol water by collision; the special plate group is provided with hook-shaped baffles with the front and rear gaps sequentially reduced, and has the functions of collecting oil droplets and increasing the size of the oil droplets.

8. The process for separating oil-containing phenol water according to claim 7, wherein the second overflow plate is a semicircular baffle plate, and a first opening is formed in the bottom of the second overflow plate; the third overflow plate and the top of the shell form an upper opening; the third overflow plate and the bottom of the shell form a lower opening.

9. The process for separating oil-containing phenol water according to claim 7, wherein a first pipe, a pump, a second pipe and a third pipe are sequentially arranged on the pipeline between the heavy phase outlet of the second multiplying separator and the filter; the first pipe fitting, the second pipe fitting and the third pipe fitting are all three-way pipe fittings; the third pipe orifice of the first pipe fitting is connected with the feed opening of the second buffer tank through a pipeline; the third pipe orifice of the second pipe fitting is connected with the discharge hole of the oil separator through a second return pipe; and a third pipe orifice of the third pipe fitting is connected with a feed inlet of the oil separator through a first return pipe.

10. The process for separating oil-containing phenol water of claim 9 wherein said first return line is further provided with a fourth pipe; the fourth pipe fitting is a three-way pipe fitting; and a third pipe orifice of the fourth pipe fitting is connected with the feeding gradually-expanding orifice of the first multiplication separator through a third return pipe.