CN112239896A - Preparation method and application of polypropylene fiber - Google Patents
Preparation method and application of polypropylene fiber Download PDFInfo
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- CN112239896A CN112239896A CN201910650897.5A CN201910650897A CN112239896A CN 112239896 A CN112239896 A CN 112239896A CN 201910650897 A CN201910650897 A CN 201910650897A CN 112239896 A CN112239896 A CN 112239896A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0202—Separation of non-miscible liquids by ab- or adsorption
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
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- General Chemical & Material Sciences (AREA)
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- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a preparation method of polypropylene fiber and the polypropylene fiber prepared by the method, comprising the following steps: s1, mixing polypropylene resin and an antioxidant, and then carrying out spinning treatment to obtain polypropylene filaments; and S2, carrying out three-stage cooling treatment on the polypropylene filaments to obtain the polypropylene fibers. The method has simple process and short production path, and the polypropylene fiber prepared by the method has moderate aperture, high mechanical strength and excellent separation performance, is applied to treating the oily sewage, and has high oil removal efficiency on the sewage. The invention also provides a device for treating the oily sewage, which has the advantages of simple structure, less power consumption, no need of adding any medicament, better removal effect on the oil stains in the sewage, lower pollution and good application prospect in the field of oily sewage treatment.
Description
Technical Field
The invention relates to a preparation method of polypropylene fiber, a polypropylene fiber material prepared by the method, application of the polypropylene fiber material in treating oily sewage, and a device for treating oily sewage, belonging to the technical field of water treatment.
Background
The oily sewage has wide sources, a large amount of oily sewage can be generated in the refining process of petroleum and the processing process of various materials in the petrochemical industry, and the oily sewage can be formed in the cleaning and using processes of various pipelines. The untreated oily sewage is discharged into soil or rivers and lakes, which causes environmental deterioration, brings about a series of disasters, and also seriously affects human health. The oily sewage is treated and then discharged after reaching the standard, on one hand, two precious resources of oil and water can be saved, the recovery and the reutilization of the resources are realized, and on the other hand, the method has extremely important significance for environmental protection, ecological balance construction, sustainable development of human health and the like.
The coalescence method is an important method for oil-water separation, and utilizes the characteristic that the affinity of oil and water is greatly different from that of coalescence material to implement two-phase separation. The method has simple treatment process, is a physical process, has small device volume, can not generate new impurities, and can achieve high separation efficiency. The selection principle of the coalescence material is as follows: the oil resistance is good, and the oil can not be dissolved or swelled; the material has certain mechanical strength and is not easy to wear; is not easy to harden and is convenient to wash.
The commonly used coalescence material comprises a plate shape, fibers, loose solid particles and other forms, the fiber material can be made into aggregates in various forms and fixed on equipment, the problem of filler loss is avoided, the limitation of the particle size of the loose solid particles is broken through, and meanwhile, the fiber filler has high porosity (epsilon is 0.85-0.99) and has higher separation efficiency than other medium materials. According to the adsorbability of the surface to oil and water, the coalescent fiber can be divided into a lipophilic type and a hydrophilic type, and when oily sewage is treated, a lipophilic material is generally taken as a first choice, and the material can enable oil drops in the sewage to be better coalesced on the surface of the material, so that the separation efficiency is improved. The diameter of the coalescent fiber material can affect the coalescent separation effect, the surface area of the diameter of the fine material is large, the pore size is small, the coalescent process and the separation efficiency between liquid drops can be promoted, but when the diameter of the fiber material is too small, the pressure drop of a coalescer is increased, the resistance is correspondingly increased, the pressure is increased to reduce the coalescent separation effect, and meanwhile, the strength of the material can be affected by too small fiber diameter, so that the service time of equipment is shortened. The invention prepares the polypropylene coalescent fiber material with moderate diameter and size, high mechanical strength and excellent separation performance by a simple method, and is applied to the treatment of oily sewage of refining enterprises.
Disclosure of Invention
The invention aims to provide a preparation method of polypropylene fiber according to the defects in the prior art, the method has simple and convenient process and short production path, the polypropylene fiber prepared by the method has moderate aperture, high mechanical strength and excellent separation performance, is applied to treating oily sewage, and has high oil removal efficiency on the sewage.
According to one aspect of the present invention, there is provided a method for preparing polypropylene fibers, comprising the steps of:
s1, mixing polypropylene resin and an antioxidant, and then carrying out spinning treatment to obtain polypropylene filaments;
and S2, carrying out three-stage cooling treatment on the polypropylene filaments to obtain the polypropylene fibers.
According to some embodiments of the invention, the step S1 includes:
1A, mixing polypropylene resin and an antioxidant, and performing melting and defoaming treatment to obtain a spinning solution;
and 1B, conveying the spinning solution to a spinning nozzle, and extruding through the spinning nozzle to obtain polypropylene filaments.
According to the preferred embodiment of the invention, the mass ratio of the polypropylene resin to the antioxidant is (90-99): 1-10), the addition amount of the antioxidant is not more than 10%, the problems of poor compatibility of raw material components, incomplete prepared fiber structure and performance reduction caused by excessive addition amount are avoided, and the preferred mass ratio is (95-99): 1-5.
According to a preferred embodiment of the present invention, the polypropylene resin has a melt index of 0.5-100g/10min, and the polypropylene resin has good flowability, processability and mechanical properties in the melt index range, wherein the melt index is measured at a temperature of 230 ℃ and a load weight of 2.16 kg.
According to a preferred embodiment of the present invention, the antioxidant comprises at least one of antioxidant 1010, antioxidant 1076 and antioxidant 1790. The polypropylene molecule contains tertiary carbon chain, which is easy to be decomposed by heating, and the antioxidant is added to prevent the polypropylene molecule from being decomposed so as to avoid reducing the physical property of the material. The antioxidant can firstly react with oxygen in the presence of oxygen by virtue of a reduction reaction, and is oxidized to protect raw materials needing to be protected; some antioxidants are free radical absorbers, i.e. free radical scavengers, which can bind to the intermediates of the oxidation process, thus rendering the oxidation reaction impossible; the antioxidant can also release hydrogen ions to destroy and decompose peroxide generated in the oxidation process, so that the oxidation reaction can not be continued.
According to a preferred embodiment of the present invention, the polypropylene resin raw material is dried at 70 to 90 ℃ for 2 to 6 hours before use, and then mixed with an antioxidant, preferably under nitrogen gas. If the drying time is too short, the performance of the prepared polypropylene fiber product is poor; some drying times are too long, which can reduce the production efficiency.
According to the preferred embodiment of the invention, the temperature of the melting treatment is 175-230 ℃, and the time is 0.5-3 h; the time of the defoaming treatment is 0.5-5 h.
According to a preferred embodiment of the present invention, the step 1A may be performed as follows: drying the polypropylene resin raw material at 70-90 ℃ for 2-6 hours, mixing the polypropylene resin raw material with an antioxidant in a spinning kettle with a stirring device, heating to 175-230 ℃, stirring for 0.5-3 hours under the condition of introducing nitrogen, and uniformly mixing; and after stirring is stopped, standing and defoaming for 0.5-5h to obtain the spinning solution.
According to some embodiments of the invention, the spinneret has a hole diameter of 0.5 to 2mm, preferably 0.5 to 1.5 mm; the temperature is 140 ℃ to 180 ℃, preferably 150 ℃ to 170 ℃.
According to a preferred embodiment of the present invention, the step 1B may be performed as follows: and filtering the spinning solution, conveying the filtered spinning solution to a spinning nozzle by using a metering pump, and extruding the spinning solution through the spinning nozzle at a constant speed to obtain polypropylene filaments.
According to some embodiments of the invention, the step S2 includes:
and (2) allowing the polypropylene filaments to stay for 5-20s through a water bath at 80-100 ℃ for cooling, then allowing the polypropylene filaments to stay for 1-20s through a water bath at 40-60 ℃ for cooling, and finally allowing the polypropylene filaments to stay for 1-20s through a water bath at 5-10 ℃ for cooling to obtain the polypropylene fiber.
And after water bath treatment, winding and collecting the polypropylene fibers by using a traction wheel.
According to the invention, the nascent fiber is cooled and solidified by three different coagulation baths, so that the internal stress of the fiber can be reduced to the greatest extent, the phenomena of stress cracking, warping deformation and the like are prevented, and the mechanical and thermal properties of the polypropylene fiber are improved.
According to some embodiments of the invention, the method further comprises the steps of:
and S3, respectively soaking the polypropylene fibers with an acid solution and an alkali solution, and cleaning and drying the polypropylene fibers.
According to a preferred embodiment of the invention, the acid solution is a hydrochloric acid solution, with a concentration of 0.5 to 1mol/L, preferably 0.5 mol/L; the alkali solution is sodium hydroxide solution, and the concentration is 0.5-1mol/L, preferably 0.5 mol/L.
According to a preferred embodiment of the present invention, the step S3 may be performed as follows: soaking the prepared polypropylene fiber in an acid solution for 5-10h, then soaking in an alkali solution for 5-10h, washing with deionized water to neutrality, then drying at 60-80 ℃ for 12-24h, and removing surface moisture to obtain the polypropylene fiber.
After the treatment, the pollutants on the surface of the polypropylene fiber can be removed.
According to another aspect of the present invention, there is also provided the use of the polypropylene fiber described above for the treatment of oily wastewater, comprising passing the oily wastewater through the polypropylene fiber to separate the oil phase from the water phase therein.
The polypropylene fiber is an oleophilic material, when oily sewage passes through the polypropylene fiber, oil drops in the sewage are coalesced on the surface of the polypropylene fiber due to different affinities of an oil phase and a water phase to the polypropylene fiber, so that the oil drops are changed from small to large, the oil drops after being changed in size float upwards due to smaller density, and further the separation of the oil phase and the water phase is realized.
According to another aspect of the present invention, there is also provided an apparatus for treating oily sewage, comprising:
a liquid storage tank for storing oily sewage;
a coalescer connected to said tank and filled with said polypropylene fibers for receiving and treating oily wastewater from said tank to separate oil and water phases therein;
a water production tank connected to said coalescer for receiving the aqueous phase from said coalescer;
an oil collection tank connected to the coalescer for receiving the oil phase from the coalescer.
According to some embodiments of the invention, the polypropylene fibers are packed in a bed of the coalescer by layered compaction at a packing ratio of 1/2.
According to a preferred embodiment of the present invention, the coalescer is provided with a sewage inlet, a water phase outlet and an oil phase outlet. In some specific embodiments, the oil phase outlet is disposed in an upper portion of the coalescer, and the water phase outlet is disposed in a sidewall of the coalescer.
According to a preferred embodiment of the invention, the apparatus further comprises a sewage tank arranged between the liquid reservoir and the coalescer, the sewage tank being provided with a sewage inlet communicating with the liquid reservoir via a pipe, a sewage outlet communicating with the inlet of the coalescer via a pipe, and a gas inlet, for receiving sewage from the liquid reservoir and conveying it to the coalescer.
According to a preferred embodiment of the present invention, the apparatus further comprises a sewage pump disposed on the pipe between the liquid tank and the sewage tank, for pumping the sewage in the liquid tank into the sewage tank.
According to a preferred embodiment of the invention, the apparatus further comprises a gas source connected to the gas inlet of the waste tank for supplying gas into the waste tank to increase the pressure to push the waste water into the coalescer. In some embodiments, the gas source is a nitrogen gas cylinder. The air source is connected with the sewage tank through a pipeline, and a pressure stabilizing valve is arranged on the pipeline.
According to a preferred embodiment of the present invention, the apparatus further comprises a flow regulating valve, a flow meter and a feed pump arranged in sequence on the pipe between the sewage tank and the coalescer.
According to a preferred embodiment of the invention, the water production tank communicates with the water phase outlet of the coalescer by means of a conduit, and the oil collection tank communicates with the oil phase outlet of the coalescer by means of a conduit.
The working process and the principle of the device for treating the oily sewage are as follows:
pumping oily sewage with a temperature of 30-50 deg.C in the liquid storage tank into the sewage tank via the sewage pump, pumping the liquid in the sewage tank into the coalescer via the feeding pump, and controlling the inflow of water at 0.1-0.5m by adjusting the flow regulating valve3Within/h; the oil phase in the sewage is slowly attached to the surface of the polypropylene fiber and then is gathered to form oil drops, the large-particle oil drops are carried away from the surface of the polypropylene fiber by the water phase and enter the oil collecting tank through the oil phase outlet, and the water phase without the oil phase enters the water producing tank through the water phase outlet.
According to another aspect of the present invention, there is provided a method for treating oily sewage using the above apparatus, comprising:
(1) the polypropylene fibers are compacted and filled into a bed layer of a coalescer layer in a layered mode, and the filling ratio is 1/2;
(2) pumping the oily sewage in the liquid storage tank into a sewage tank through a sewage pump;
(3) opening a flow regulating valve, a flowmeter, a pressure stabilizing valve and an air source, pumping the liquid in the sewage tank into the coalescer by a feed pump, and controlling the inflow of water to be 0.1-0.5m by regulating the flow regulating valve3Within/h; the oil phase in the sewage is slowly attached to the surface of the polypropylene fiber and then is gathered to form oil drops, the large-particle oil drops are carried away from the surface of the polypropylene fiber by the water phase and enter the oil collecting tank through the oil phase outlet, and the water phase without the oil phase enters the water producing tank through the water phase outlet.
In the technical scheme, the pH value of the oily sewage is 7-8, and the oil content is 1183-1572 mg/L.
According to the preferred embodiment of the present invention, the temperature of the treated oily water is preferably 30 to 50 ℃, and if the temperature is too high, although it is advantageous to increase the oil removal rate, the long-term operation at high temperature may be disadvantageous to the stability of the fiber coalescing material.
The invention has the advantages and beneficial technical effects as follows:
the preparation method of the polypropylene fiber has the advantages of simple process, short production path, easy operation, low energy consumption and low investment, and is very suitable for large-scale industrial production. According to the invention, the nascent fiber is cooled and solidified by three different coagulation baths, so that the internal stress of the fiber can be reduced to the greatest extent, the phenomena of stress cracking, buckling deformation and the like are prevented, and the mechanical, thermal and oil-water separation performances of the polypropylene fiber are improved. The polypropylene fiber prepared by the method has the advantages of moderate aperture, high mechanical strength, long service life, excellent separation performance, strong stability, high oil removing efficiency on sewage when being applied to the treatment of the oil-containing sewage, simple structure, less power consumption, lower pollution and good application prospect in the field of oil-containing sewage treatment, and can play a good role in removing the oil stain in the sewage without adding any medicament.
Drawings
FIG. 1 is a schematic structural view of an apparatus for treating oily sewage according to the present invention;
description of reference numerals: 1: a gas source; 2: a liquid storage tank; 3: a pressure maintaining valve; 4: a sewage pump; 5: a sewage tank; 6: a flow regulating valve; 7: a flow meter; 8: a feed pump; 9: a coalescer; 10: a water producing tank; 11: an oil collecting tank.
Detailed Description
The present invention is described below with reference to specific examples, which are not intended to limit the scope of the present invention, and those skilled in the art may make insubstantial modifications and adaptations of the present invention based on the above-described disclosure.
The starting materials used in the examples are all commercially available unless otherwise specified.
The test method comprises the following steps:
the fiber mechanical properties were tested using a 3342 universal materials tester, INSTRON USA.
The oil content in the water is measured according to the national standard GB/T16488 and 1996 determination of water quality petroleum and animal and vegetable oil;
the oil removal rate was calculated as follows:
in the formula, C0Represents the oil content of the oily sewage in the sewage tank, mg/L;
c represents the oil content of the water phase in the water production tank, mg/L.
As shown in fig. 1, the apparatus for treating oily sewage of the present invention comprises an air source 1, a liquid storage tank 2, a pressure-stabilizing valve 3, a sewage pump 4, a sewage tank 5, a flow rate regulating valve 6, a flow meter 7, a feed pump 8, a coalescer 9, a water production tank 10 and a oil collection tank 11.
Wherein, the liquid storage tank 2 is used for storing oily sewage, the temperature of the sewage is 30-50 ℃, and the sewage is sequentially connected with a sewage pump 4 through a pipeline; the sewage pump 4 is connected with a sewage inlet of the sewage tank 5 through a pipeline and is used for pumping the oily sewage in the liquid storage tank 2 into the sewage tank 5. The gas source 1 is connected with a gas inlet of a sewage tank 5 through a pipeline, a pressure stabilizing valve 3 is arranged on the pipeline, and in the embodiment of the invention, the gas source 1 is preferably a nitrogen cylinder. The sewage outlet of the sewage tank 5 is connected with a feed pump 8 through a pipeline, a flow regulating valve 6 and a flow meter 7 are sequentially arranged on the pipeline, and the feed pump is connected with the inlet of a coalescer 9 through a pipeline and is used for pumping the sewage in the sewage tank 5 into the coalescer 9 for treatment. The coalescer 9 is filled with polypropylene fibers to treat the wastewater and separate the oil and water phases. The coalescer comprises an oil phase outlet and a water phase outlet, the oil phase outlet is connected with the oil collecting tank 11 through a pipeline, and the water phase outlet is connected with the water producing tank 10 through a pipeline.
Examples 1 to 39 and comparative examples 1 to 22
(1) And (3) drying the polypropylene master batch, adding the polypropylene master batch into a spinning kettle with a stirring device, mixing the polypropylene master batch with an antioxidant in proportion, heating the mixture to a certain temperature for melting, stirring the mixture for a period of time under the condition of introducing nitrogen, stopping stirring, standing the mixture for a period of time, and defoaming the mixture to obtain the polypropylene spinning solution.
(2) And filtering the spinning solution by a filter screen, conveying the spinning solution to a spinning nozzle by a metering pump, extruding the spinning solution melt at a constant speed to form polypropylene fiber filaments, cooling the filaments in a three-stage water bath, and winding and collecting the polypropylene fiber filaments by a traction wheel.
(3) The prepared polypropylene fiber is soaked in 0.5mol/L HCI solution for a period of time, then soaked in 0.5mol/L NaOH solution for a period of time, washed to be neutral by deionized water, dried in an oven, and the moisture adsorbed on the surface is removed, thus preparing the polypropylene coalescent fiber.
The data of each step are shown in Table 1.
Examples 40 to 82 and comparative examples 23 to 48
The device shown in figure 1 is used for treating oily wastewater of a certain refinery, wherein the pH of the wastewater is 7.0, and the oil content of the wastewater is 1366 mg/L.
(1) The polypropylene fibers prepared in examples 1-39 and comparative examples 1-23 were packed in layers in a coalescer bed at a packing ratio of 1/2.
(2) Pumping the oily sewage with the temperature of 30-50 ℃ in the liquid storage tank into a sewage tank through a sewage pump;
(3) opening a flow regulating valve, a force and pressure stabilizing valve and an air source, pumping the liquid in the sewage tank into the coalescer by a feed pump, and controlling the inflow of water to be 0.1-0.5m by regulating the flow regulating valve3/h。
And measuring data after the operation is stable, and calculating to obtain the oil removal rate.
The data for each example and comparative example are shown in table 2.
Any numerical value mentioned in this specification, if there is only a two unit interval between any lowest value and any highest value, includes all values from the lowest value to the highest value incremented by one unit at a time. For example, if it is stated that the amount of a component, or a value of a process variable such as temperature, pressure, time, etc., is 50 to 90, it is meant in this specification that values of 51 to 89, 52 to 88 … …, and 69 to 71, and 70 to 71, etc., are specifically enumerated. For non-integer values, units of 0.1, 0.01, 0.001, or 0.0001 may be considered as appropriate. These are only some specifically named examples. In a similar manner, all possible combinations of numerical values between the lowest value and the highest value enumerated are to be considered to be disclosed in this application.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. A preparation method of polypropylene fiber comprises the following steps:
s1, mixing polypropylene resin and an antioxidant, and then carrying out spinning treatment to obtain polypropylene filaments;
and S2, carrying out three-stage cooling treatment on the polypropylene filaments to obtain the polypropylene fibers.
2. The method for preparing a composite material according to claim 1, wherein the step S1 includes:
1A, mixing polypropylene resin and an antioxidant, and performing melting and defoaming treatment to obtain a spinning solution;
and 1B, conveying the spinning solution to a spinning nozzle, and extruding through the spinning nozzle to obtain polypropylene filaments.
3. The method according to claim 1 or 2, wherein the mass ratio of the polypropylene resin to the antioxidant is (90-99): (1-10), preferably (95-99): (1-5).
4. The method according to any one of claims 1 to 3, wherein the temperature of the melting treatment is 175-230 ℃ and the time is 0.5-3 h; the time of the defoaming treatment is 0.5-2 h.
5. The production method according to any one of claims 1 to 4, wherein the spinneret has a hole diameter of 0.5 to 2mm, preferably 0.5 to 1.5 mm; the temperature is 140 ℃ to 180 ℃, preferably 150 ℃ to 170 ℃.
6. The production method according to any one of claims 1 to 5, wherein the step S2 includes:
cooling the polypropylene filaments by a water bath at 80-100 ℃, then cooling by a water bath at 40-60 ℃, and finally cooling by a water bath at 5-10 ℃ to prepare the polypropylene fibers.
7. The method for preparing according to any one of claims 1 to 6, further comprising the steps of:
and S3, respectively soaking the polypropylene fibers with an acid solution and an alkali solution, and cleaning and drying the polypropylene fibers.
8. Polypropylene fibers prepared according to the process of any one of claims 1 to 7.
9. Use of polypropylene fibers prepared according to any one of claims 1 to 7 for the treatment of oily wastewater comprising passing oily wastewater through said polypropylene fibers to separate the oil and water phases therein.
10. An apparatus for treating oily sewage, comprising:
a liquid storage tank for storing oily sewage;
a coalescer connected to the liquid tank and filled with the polypropylene fiber prepared according to any one of claims 1 to 7 for receiving the oily wastewater from the liquid tank and treating the same to separate an oil phase and a water phase therein;
a water production tank connected to said coalescer for receiving the aqueous phase from said coalescer;
an oil collection tank connected to the coalescer for receiving the oil phase from the coalescer.
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