281results about How to "Promote demulsification" patented technology

The invention discloses a treatment method for oily mud. The invention carries on mechanical dehydration to oily mud, then blends with extracted solvent oil and preheats them, then carries on heat extraction and dehydration, carries on solid-liquid separation, the liquid phase enters the coking device, the solid phase can be used as fuel. The gas phase is carried on oil and water separation, the water can be discharged into the waste water treatment field; oil is carried on further treatment. The method is simple and easy to be operated.

The eddy cavitating unit used in the technological field of chemical separation consists of liquid inlet pipe and three coaxial cylinders including inner cylinder, middle cylinder and outer cylinder, the outer cylinder and the middle cylinder have individual tops with central inlet and common bottom, and the inner cylinder is a hollow cylinder and is connected to the middle cylinder via four radial cross beams. Or, the eddy cavitating unit consists of liquid inlet pipe, paraboloidal cone, disc with slit, flow guide plate and nozzle. Or, the eddy cavitating unit consists of liquid inlet pipe, outer paraboloidal cone, inner funnel cone and nozzle.

The invention discloses a preparation method of a phenolated lignin amine cationic emulsifier. The method comprises the following steps: heating an alkaline liquid of alkali lignin and a proper amount of phenol to 70-100 DEG C and reacting for 1-3h, then, acidizing a reaction liquid to realize pH=2.5 with 1 mol / L hydrochloric acid, performing suction filtration, washing with hot water at 80-100 DEG C until free phenol disappears completely, thus obtaining phenolated lignin; dissolving the phenolated lignin in a NaOH liquid with mass fraction of 10% and regulating pH to 10.5-12, then, further adding a mixed liquid of a certain amount of small molecule polyamine and 37% formaldehyde, reacting for 3-5h at 90 DEG C, then, introducing amine methyl hydrophilic groups into the phenolated lignin, thereby obtaining the cationic emulsifier which has positive electricity under the condition of diluted acid. In comparison with the cationic emulsifier modified by the lignin which is not phenolated, the emulsifier provided by the invention has higher surface activity, stronger Zeta potential and stronger emulsion stability, and can be widely used in the fields of road engineering, building waterproofing, material corrosion prevention, water conservancy construction, and so on.

The invention discloses a demulsifying and flocculating treatment method of machining cutting fluid sewage water, comprising the following steps: conveying cutting fluid sewage water in an acidification pool and adding diluted sulfuric acid for acidification; adjusting the pH to be 3.5-5.5; then conveying in a demulsifying device and adding ferrous sulfate solution for demulsification and precipitation; then conveying in a neutralization pond and adding NaOH solution for neutralization; conveying in a coagulating basin after neutralization and adding a coagulating agent for coagulation; then adding polyacrylamide to a flocculation tank; flowing down by a sieve body through the square rectifying plate of the flocculation tank after flocculating; depositing through the sloped tube stuffing body of a flocculation precipitation pool; discharging out supernatant fluid from a water collection weir; and removing precipitated sludge floccule. The method has the characteristics of integrating oil removal, demulsifying and flocculating, and being thorough for pollution control, good in application effect and economic and efficient; the effluent COD (Chemical Oxygen Demand) of cutting fluid sewage water treated through the method can be decreased to below 500mg / L; and the method can be widely applied to sewage water treatment in machining industry.

A process for converting heavy sulfur-containing crude oil into lighter crude oil with lower sulfur content and lower molecular weight is provided. The process is a low-temperature process using controlled cavitation.

The invention provides a reversed phase emulsion splitter, which is a product of the combination of long-chain alkyl 1.0G polyamide-imide and long-chain alkyl benzenesulfonic acid in a solvent, wherein the long-chain alkyl 1.0G polyamide-imide is a compound of a general structural formula I and the long-chain alkyl benzenesulfonic acid is a compound of a general structural formula II; in the formula I, R1 is an alkyl of which the main chain has 6 to 28 carbon atoms; and in the formula II, R2 is an alkyl of which the main chain has 6 to 24 carbon atoms. The reversed phase emulsion splitter has high emulsion splitting performance for O / W type emulsions and can be used in the field of the low-temperature dehydration of reversed phase emulsions and the treatment of oil-containing waste water.

The non-polyether demulsifying agent for thick oil of disclosed by the invention pertains to crude petroleum demulsifying agent for oilfield. The non-polyether demulsifying agent prepared by solution co-polymerization using butyl acrylate and acrylic acid as raw material is proposed to solve the problems of conventional non-polyether demulsifying agent which are complexity in preparation and bad demulsifying effect. The invention adopts method of solution polymerization, improves monomer charging method by charging butyl acrylate in one time, and charging active monomer acroleic acid batchwisely or continuously in copolymerizing process. The copolymer has good amphipathic property, good demulsifying effect, and is suitable for thich oil.

The invention discloses a wastewater treatment process of oil-retaining emulsion liquid waste water, which adopts electrochemical demulsification. The technological process is as follows: the oil-retaining emulsion liquid waste water; grate pretreatment; adjustment of water quality and volume; electrochemical demulsification; oxidation or precipitation; filtration; clear water. The electrochemical demulsification and separation reaction pond during electrochemical demulsification has the advantages of continuous demulsification and separation, operation under normal temperature and atmospheric pressure, low operating cost, small occupied area of the complete equipment, convenient maintenance, easy operation, applicability to demulsification and separation of oil-retaining emulsion liquid waste water. The electrochemical demulsification has the advantages of integrated mode of ionization and chemical reaction, optimal demulsification effect, high oil-water separation efficiency, high decoloration efficiency, good effluent close to the standard of tap water examined by sensory organ, high water quality up to first class discharge standard and recyclability.

A large phase ratio liquid-liquid two-phase continuous extraction apparatus belongs to the field of liquid-liquid extraction and separation. The apparatus contains a tower body, a gas buffer chamber, a liquid film aggregation device, liquid film dispersers, a liquid film distributor, an air-pressure chamber and the like. The liquid film dispersers and the liquid film distributor can be combined together to realize dispersion of small-volume organic phase by the use of tiny bubbles, thus solving the problem that it is not easy to fully disperse small-volume organic phase by a traditional stirring mode. The phase ratio of a light phase to a heavy phase flowing upstream in the tower body can be adjusted by the interlayer gap of the liquid film distributor. The light phase and the heavy phase can be operated by counter current under the condition of super-large phase ratio. A liquid film disperser and a bubble connection cap are arranged at intervals in the tower body, so as to realize repeated coagulation and dispersion of rising bubbles and achieve high stage efficiency of height of mass transfer unit. A liquid film aggregation device on the top of the tower can be used for bubble coagulation and demulsification and is suitable for extraction operation of an easily-emulsified system. The apparatus provided by the invention is applicable to continuous countercurrent operation under the condition of multi-stage series connection.

The invention provides a novel non-polyether demulsifier and its preparation method. The non-polyether demulsifier contains a copolymer prepared by seeded emulsion copolymerization of a hydrophilic monomer, a hydrophobic monomer and an optional cross-linked monomer. The weight ratio of the hydrophilic monomer to the hydrophobic monomer is 3: 97-20: 80. The demulsifier of the invention has advantages as follows: raw materials are easily available; production condition is mild; high temperature and high pressure are not required; operation is convenient; and cost is low. The non-polyether demulsifier of the invention can be used in demulsification of crude oil in an oil field, especially in demulsification of thickened oil. The non-polyether demulsifier has a good demulsification effect.

The present invention relates to a superhydrophobic sponge body and a preparation method thereof. A purpose of the present invention is to mainly solve the problem of poor hydrophobic effect of the existing adsorption recovery material. The technical scheme of the present invention comprises a superhydrophobic sponge body and a preparation method thereof, wherein the superhydrophobic sponge body comprises a sponge body and a nanometer modifier, the sponge body is a melamine sponge or a polyurethane sponge, and the nanometer modifier preparation method comprises: dissolving a nanometer material in a hydrophobic organosilicon compound agent, and stirring until completely dissolving so as to obtain the nanometer modifier. With the technical scheme of the present invention, the problem in the prior art is well solved. The preparation method of the present invention can be used in the preparation of superhydrophobic sponge bodies.

The invention relates to a treatment method for wastewater generated by processing high-acid crude oil, which adopts the combined processes of oil isolation, demulsification, dissolved air flotation, electrochemical catalytic oxidation, biological membrane moving bed reactor and filtering. The electro-desalting wastewater in the high-acid crude oil refining process is treated. When the method provided by the invention is adopted, the treatment process of other wastewater such as oil-containing wastewater, salt-containing wastewater and the like in the high-acid crude oil processing process can not be influenced by the high-acid crude oil wastewater, and the beneficial effects are brought for the stable operation of the oil isolation, the flotation, biochemistry and deep treatment units ofthe final sewage treatment field, so the problem that the wastewater generated by processing the high-acid crude oil at present can not reach the standard is solved, and the good basis is provided for the sewage reuse.

The invention provides a method for rut maintaining and paving of a municipal road. The method comprises the following steps: (1) milling an asphalt surface layer; (2) spreading a modified emulsified asphalt bonding layer; (3) paving an emulsified asphalt cold-recycling mixture lower surface layer; (4) paving a high-elasticity rubber asphalt stress absorption layer; and (5) paving a cement-asphalt pouring type composite pavement surface layer. The combined paving layer obtained through the method has an excellent anti-rutting property and can sufficiently utilize a milled waste asphalt mixture; the integral structure has the characteristics of high rutting resistance, skid resistance, abrasion resistance, long life and low carbon.

The invention relates to a method for performing emulsion breaking on an oil-water emulsion by an ultrasonic wave. In the method, one or more ultrasonic generators are arranged in a raw material storage tank or a settlement tank in the gravity settling direction, only one ultrasonic generator acts in the direction of the same vertical line. An emulsion breaking device for implementing the method comprises the raw material storage tank or the settlement tank, and one or more ultrasonic generators are arranged at the bottom or / and top of the raw material storage tank or the settlement tank. The ultrasonic generators are distributed reasonably according to structural size and ultrasonic radiation areas, so that the ultrasonic generators cover comprehensively, and are prevented from being overlapped. The ultrasonic generators are connected with ultrasonic distributors, and one ultrasonic generator is arranged in one ultrasonic distributor. The action direction of the ultrasonic wave is the vertical direction and is consistent with the gravity settling direction, so the driving force is added in the oil-water settling direction, and the oil-water settling speed is accelerated. The device is uniform in ultrasonic wave energy distribution, excellent in emulsion breaking effect, simple in operation, convenient to run and maintain and low in running cost.

The invention discloses a composite binder for repairing of pits in an asphalt pavement and a preparation method of the composite binder. The composite binder comprises 100 parts of SBS (styrene-butadiene-styrene) modified emulsified asphalt, 10-22.2 parts of water-borne epoxy resin, 5-11.1 parts of a water-borne curing agent, 41.7-62.5 parts of cement and 0.5-2 parts of a tackifier. The method comprises steps as follows: the water-borne epoxy resin and the water-borne curing agent are uniformly mixed in a certain proportion, and the SBS modified emulsified asphalt in a certain proportion is mixed in the formed mixture; an obtained waterborne epoxy emulsified asphalt mixed solution is sheared at a high speed for certain time, cement and a coupling water solution in a certain proportion are added, the mixture is continuously stirred for certain time, and the anti-shear, anti-drawing, anti-fatigue and durable composite binding material for repairing of the pits in the asphalt pavement can be obtained. The prepared CWEA type composite binder has higher anti-shear and anti-drawing performance at low temperature, also has excellent anti-shear, anti-fatigue and durable characteristics at high temperature and is an organic and inorganic composite which has good processability and can be used for repairing of pits formed in the asphalt pavement in catastrophes.

The invention discloses a stratum-adsorption-resistant thick oil viscosity-reducing oil-displacing agent and applications thereof, and belongs to the technical field of oil exploitation, wherein the oil displacing agent comprises: 10-15 wt% of a triple anionic and nonionic surfactant, 10-15 wt% of an anionic and nonionic surfactant, 10-30 wt% of a nonionic surfactant, 15-25 wt% of low-carbon alcohol and 15-55 wt% of water. According to the invention, under the concentration of 0.3%, the oil-water interfacial tension is less than or equal to 1.0*10<-1> mN / m, the viscosity reduction rate is morethan or equal to 95%, and the natural dehydration rate is more than or equal to 80%; after stratum sand adsorption is simulated, the oil-water interfacial tension is less than or equal to 1.0*10<-1>mN / m, and the viscosity reduction rate is greater than or equal to 90%; and the product has easily available raw materials, is convenient to use, is suitable for heavy oil reservoirs with formation water mineralization degree of lower than 300000 mg / L, calcium and magnesium ion concentration of lower than 5000 mg / L and crude oil viscosity of lower than 10000 mPa.s, and can greatly enhance the crude oil recovery ratio.

The invention relates to a sewage treatment process and equipment thereof, belonging to the technology field of sewage treatment. The process comprises feeding oil field produced water into a flocculating and settling tank for flocculation and settlement; collecting supernatant in the flocculating and settling tank, and feeding into a hydrolysis and acidification tank with an electric stirrer; feeding the effluent from the hydrolysis and acidification tank into a settling tank, and allowing anaerobic hydrolysis; collecting supernatant in the upper part of the settling tank, and feeding into a dynamic bioreactor; removing small-diameter oil drops and macro molecules in the supernatant via aerobic microorganism decomposition and adsorptive filtration by biofilm component; and discharging reinjection water or discharge water coming up to the standards from the dynamic bioreactor. The equipment comprises a flocculating and settling tank, a hydrolysis and acidification tank, a settling tank, and a dynamic bioreactor, wherein a peristaltic pump is arranged between the flocculating and settling tank and the hydrolysis and acidification tank, sludge retune pipe is arranged between the settling tank and the hydrolysis and acidification tank, an electric stirrer is arranged inside the hydrolysis and acidification tank, and an aeration device and a biofilm component are arranged inside the dynamic bioreactor.

The invention provides a palm oil-base offset printing ink containing no mineral oil. The offset printing ink comprises the following components in percentage by mass: 10 to 25 percent of pigment, 40 to 75 percent of binding material, 5 to 30 percent of palm oil, 5 to 30 percent of palm oil derivative and 0.1 to 5 percent of auxiliary agent, wherein the binding material comprises 10 to 50 percentof palm oil, 10 to 50 percent of palm oil derivative and 30 to 70 percent of rosin modified phenolic resin. The invention also provides a preparation method of the ink. The offset printing ink prepared by the method does not contain the mineral oil and has the characteristics of no toxicity, no irritating smell, no corrosion, no combustibility, high using safety, high concentration, high printingadaptability, high dilution, high emulsification resistance and the like. Compared with the domestic soybean oil, the offset printing ink is low in volatile organic compound (VOC) content.

The invention relates to a pretreatment method for high-acid inferior crude oil processing wastewater. The method comprises the following steps of: treating electric desalting wastewater in the process of refining the high-acid inferior crude oil by using an oil removal-demulsification-gas dissolving floatation-up-flow anaerobic sludge bed reactor-intermittent activated sludge process combined process; and performing biochemical treatment on effluent obtained through treatment, or treating the effluent obtained through treatment by an additionally built secondary biochemical treatment unit, and discharging the treated effluent after the treated effluent reaches a discharge standard, wherein the demulsification is carried out under the condition that the pH value is 5-6. In the method, thehigh-acid inferior crude oil electric desalting wastewater is effectively treated by a proper treatment method, the treatment of sewage of other sources is not impacted, a benefit is brought to the stable operation of oil removal, floatation, biochemical and advanced treatment units in the finally sewage field, and the method is favorable for stably reaching the standard, and treating and recycling the high-acid inferior crude oil processing wastewater.

The present invention relates to a superhydrophobic sponge body material and a preparation method thereof. A purpose of the present invention is to mainly solve the problem of poor hydrophobic effect of the existing adsorption recovery material. The technical scheme of the present invention comprises a superhydrophobic sponge body material and a preparation method thereof, wherein the superhydrophobic sponge body material comprises a sponge body and a nanometer modifier, the sponge body is a melamine sponge or a polyurethane sponge, and the nanometer modifier preparation method comprises: dissolving a nanometer material in a hydrophobic organosilicon compound agent, and stirring until completely dissolving so as to obtain the nanometer modifier. With the technical scheme of the present invention, the problem in the prior art is well solved. The preparation method of the present invention can be used in the preparation of superhydrophobic sponge bodies.

The invention discloses a multiphase flow hybrid conveying pipeline resistance reduction device and a multiphase flow hybrid conveying pipeline resistance reduction method of a mine field. The multiphase flow hybrid conveying pipeline resistance reduction device and the multiphase flow hybrid conveying pipeline resistance reduction method are characterized in that: hybrid conveyed fluid is accelerated by a reducing pipe and then enters a device main body pipeline by a tangential inlet pipe; and an annular space between the device main body pipeline and a hot water reflow pipe forms a rotational flow. Due to different densities, oil phase, gas phase and water phase form layered circular flows in the device main body pipeline. The water phase is closely attached to the inner wall of the device main body pipeline, so that direct contact of oil with the pipe wall is avoided, and the conveying resistance is greatly reduced. The oil phase is positioned between the gas phase and the water phase and is driven by the gas phase and the water phase to be transferred towards downstream side. One end of the oil, gas and water three-phase hybrid conveying rotational flow resistance reduction device is connected with a hot water circulating system to heat the hybrid conveyed fluid, so that on one hand, the viscosity of crude oil in the hybrid conveyed pipe can be reduced, and on the other hand, gas can be expanded properly, and the air flow speed is increased. The multiphase flow hybrid conveying pipeline resistance reduction device and the multiphase flow hybrid conveying pipeline resistance reduction method have the advantages of adoption of a physical technology for resistance reduction, no toxicity, no pollution, low manufacturing cost, reliability in operation, good resistance reduction effect, capability of effectively preventing paraffin deposit and high promotion and application value.

The invention discloses a preparation method of a phenol amine aldehyde block polyether low-temperature demulsifier and the low-temperature demulsifier prepared by means of the method. The method comprises the following steps: firstly performing condensation polymerization on a phenol matter, an amine matter and an aldehyde matter to prepare phenol amine aldehyde resin; and then performing a reaction with an epoxy compound to obtain final product. The demulsifier prepared by the preparation method disclosed by the invention has the advantages of being good in alkaline solubility, good in cleaning effect, free of irritant smells, convenient for field use and the like. The most applicable temperature is 45 DEG C, but the demulsifier still has a relatively good effect when the temperature is low to 41 DEG C. The demulsifier has an excellent demulsifying effect, has a good effect on the condition that the demulsifying difficulty of a low-temperature produced liquid of crude oil in a superficial layer is great and the oil content of the demulsified aqueous phase is great, and is suitable for the condition that the demulsifying difficulty of the produced liquid at the low temperature is great and the oil content of the demulsified aqueous phase is great.

The invention belongs to the technical field of oilfield application chemistry, and discloses an emulsion-type oil well viscosity-breaking paraffin removing and inhibiting agent and an application method thereof. The emulsion-type oil well viscosity-breaking paraffin removing and inhibiting agent comprises the following components in percentage by mass: 20-40% of cyclohexane, 1-3% of emulsifier, 2-15% of dispersant, 5-15% of surfactant LAS, 5-7% of sodium hydroxide, 0.5-3% of penetrant JFC and 17-66.5% of water. The emulsifier is a compounded substance of oleic acid and sodium oleate in a weight ratio of (3-5):(2-4). The agent is added in a pressure impact mode, wherein the bearing pressure is 0.3-4 MPa, the addition period is 2-3 days, the addition concentration is determined according to the paraffin and colloid+asphalt content of different oil well output liquids, and the calculation base number of the addition concentration is the liquid-producing capacity of a single oil well. The paraffin removing and inhibiting agent disclosed by the invention can effectively implement the functions of paraffin inhibition and viscosity breaking, so that the paraffin inhibition rate can be greater than 0.025 g / min, and the viscosity breaking rate can be greater than 30%; and the invention can implement quick demulsification at shaft temperature, thereby fully displaying the function of the organic solvent on removing deposited paraffin.

An efficient broad-spectrum demulsifier is prepared from propanediol and biphenol A through preparing the linear block copolyether or epoxy propane and epoxy ethane, enlarging chain by bibasic acid or its anhydride, and adding the ions of metal chosen from Fe, Co, Ni, Cu, Al, Cr, Zn, Mn and Sn to form match.

The invention discloses an offshore oil thermal recovery produced water treatment de-emulsifier and a preparation method thereof. The de-emulsifier is represented by a formula I. The preparation method comprises the steps that: (1) methyl acrylate and ethylene diamine are subjected to a Michael addition reaction, such that 0.5-generation polyamide-amine with a structure represented by a formula II is obtained; (2) the 0.5-generation polyamide-amine is subjected to ammonolysis with ethylene diamine, such that 1.0-generation polyamide-amine with a structure represented by a formula III is obtained; (3) under an alkaline condition, 1.0-generation polyamide-amine is adopted as an initial agent, and is subjected to a reaction with propylene oxide, such that a oil-base-end-linked compound is obtained; and (4) the oil-base-end-linked compound adopted as an initial agent, and is subjected to a reaction with ethylene oxide, such that ethylene oxide and propylene oxide bi-block polyether is obtained, and the de-emulsifier is obtained. The offshore oil heavy oil thermal recovery produced sewage de-emulsifier has the advantages of low dose, good treatment effect, and good water solubility. The de-emulsifier can diffuse fast to an oil-water interface and break the interface liquid film. The de-emulsifier has good de-emulsifying performance against emulsion of heavy oil thermal recovery produced sewage. Under low temperature and low dose, a dehydration rate can rapidly reach 75% or higher, such that excellent de-emulsifying performance is shown.

The invention relates to a binary flooding produced liquid comprehensive treatment agent and a preparation method. The binary flooding produced liquid comprehensive treatment agent comprises a demulsifier, a water purifying agent and a comprehensive treatment agent compounded by the demulsifier and the water purifying agent. The preparation method comprises the following steps that the demulsifier and the water purifying agent are firstly synthesized and then are compounded to form the binary flooding produced liquid comprehensive treatment agent. The demulsification problem of binary flooding produced W / O and O / W emulsion in oilfield is successfully solved, the demulsification effect is obvious, the transported sewage and the transported crude oil reach the required index, and polymer-bearing sludge is not generated in the demulsification process, thereby laying the foundation for polymer-bearing crude oil dehydration, standard reaching of polymer-bearing sewage treatment and wide use of polymer flooding technology.

The invention provides an efficient energy-saving gasoline product. The efficient energy-saving gasoline product includes base oil and an additive, wherein the base oil is a mixture of catalytic gasoline, reformulated gasoline, hydrogen gasoline, pentane oil and alkylated gasoline, and the additive includes high-activity polyisobutene amine, high-activity polyether amine, entrainer, an antirust agent, abradant and a demulsification additive; the mass ratio of the high-activity polyisobutene amine to the entrainer is 1:(1.5-3), and the mass ratio of the high-activity polyisobutene amine to the abradant is 1:(0.04-0.07). The efficient energy-saving gasoline product can effectively improve the clean performance of an engine, remarkably clear the sediment of an engine nozzle, the interior and inlet valve of the nozzle and the like, prevent the re-accumulation of carbon deposits, keep a fuel intake system clean, and continue to keep the output of engine surging power, thereby decreasing the maintenance of the engine and prolonging the service life of a vehicle.

The invention discloses a compound early strength agent for cold-recycling of emulsified asphalt. The compound early strength agent for cold-recycling of emulsified asphalt is prepared from, by mass, 5-20% of an inorganic salt type early strength agent body, 2-10% of an organic early strength agent body, 10-30% of a dispersing agent, 5-15% of demulsifier, 0.1-1% of retarder and 35-65% of water. According to the complex early strength agent, early strength improvement of a cold recycled mixture of emulsified asphalt is accelerated in two directions of acceleration of hydration of cement and promotion of demulsification of asphalt, the improvement extent can reach 1-3 times, the construction progress can be greatly accelerated, and it is beneficial to apply and popularize a cold-recycling technology emulsified asphalt; raw materials are chemical accessories commonly used in engineering, extremely easy to obtain and moderate in price, a compounding technology is simple, and large-scale production and application can be met; the long-term strength, volume index and water stability of the prepared cold recycled mixture of emulsified asphalt are greatly improved.

The invention discloses a preparation method for a pH-responsive cross-linked multilayer membrane applied to oil-water separation, belonging to the field of water treatment. The pH-responsive cross-linked multilayer membrane is prepared by subjecting dopamine to self-polymerization on a microfiltration membrane so as to achieve hydrophilic modification and then assembling an anionic polymer and acationic polymer by using a layer-by-layer self-assembling method to obtain a pH-responsive polymer coating. The surface of the obtained polymer coating is positively charged under the condition thata pH value is less than the pKa of the anionic polymer and is negatively charged under the condition that the pH value is more than the pKa of the anionic polymer. In the pH-responsive cross-linked multilayer membrane prepared by using the method, hydrophilic macromolecules and the microfiltration membrane have high bonding fastness, and the membrane has large flux, good oil-water separation effect and good flexibility; the preparation method is simple in process and low in cost; and the prepared membrane has pH responsiveness and can be recycled.