35 results about "Imidazoline derivatives" patented technology

The invention provides a high-temperature-resistant and high-salt-resistant nano imbibition agent as well as a preparation method and application thereof. The high-temperature-resistant and high-salt-resistant nano imbibition agent is prepared from amination modified mesoporous silica nanoparticles, nano cellulose, rhamnolipid, an anionic surfactant, citrate modified sodium zirconium phosphate, polyethylene glycol-b-polycaprolactone and a sulfydryl-carboxyl imidazoline derivative, therefore, the composite carrier formed by the aminated mesoporous silica nanoparticles and the nanocellulose has high mechanical strength and uniform dispersity, the oil-water interfacial tension is reduced through the synergistic effect of the rhamnolipid and the anionic surfactant, and the crude oil stripping efficiency is remarkably improved; the citrate modified sodium zirconium phosphate enables the salt resistance of the system to be greatly improved, and in a high-temperature and high-salt oil reservoir environment, the nano imbibition agent can remarkably improve the crude oil recovery rate and reduce the injection pressure and dosage; meanwhile, good adsorption resistance is achieved, and reservoir blockage is prevented; in addition, low-toxicity corrosion inhibition components protect equipment, and the service life of an oil well is prolonged.

The invention discloses a high-salt-resistance composite cleanup additive and a preparation method thereof, and relates to the technical field of oilfield chemical additives. The invention discloses a high-salt-resistance composite discharge aiding agent. The cleaning agent is prepared from the following raw materials in parts by weight: 10 to 20 parts of modified sodium dodecyl benzene sulfonate, 5 to 10 parts of cocamidopropyl betaine, 8 to 15 parts of polyoxyethylene ether, 2 to 5 parts of nano silicon dioxide, 3 to 8 parts of sodium hexametaphosphate, 1 to 3 parts of low-molecular-weight polyacrylamide, 4 to 10 parts of modified polyacrylic acid-acrylamide copolymer, 15 to 30 parts of ethanol and 5 to 12 parts of ethylene glycol butyl ether. 2-6 parts of an imidazoline derivative, 3-7 parts of amino trimethylene phosphonic acid, 4-9 parts of sodium silicate and 2-5 parts of citric acid-sodium citrate. Aiming at development requirements of high-salt oil reservoirs, sodium dodecyl benzene sulfonate and the polyacrylic acid-acrylamide copolymer are modified, and raw materials are scientifically compounded, so that the cleanup additive shows high stability in a high-salt environment, can reduce interfacial tension and effectively regulate and control rock surface wettability, has foam stability and biodegradability, and can be widely applied to high-salt oil reservoirs. The method is suitable for high-salt complex oil reservoir operation scenes.

The present invention discloses a preparation method and application of a rust-resistant polycarboxylate water reducer, including an imidazoline derivative preparation step: mixing alkyl N-hydroxyethyl imidazoline with allyl chloride and adding it to a reactor, and adding sodium hydroxide, sequentially performing substitution and dehydration reactions to obtain an imidazoline derivative; a p-isopropenylphenol polyalkoxy ether preparation step: taking p-isopropenylphenol into an autoclave, under high pressure conditions, raising the reaction temperature, adding ethylene oxide and propylene oxide to obtain p-isopropenylphenol polyalkoxy ether; a rust-resistant polycarboxylate water reducer preparation step: mixing p-isopropenylphenol polyalkoxy ether, an imidazoline derivative and deionized water and adding them to a reaction device, heating and stirring to generate a polyether monomer, then adding acrylic acid and an oxidant, and finally sequentially adding a reducing agent, an initiator, and a chain transfer agent, and neutralizing to obtain a rust-resistant polycarboxylate water reducer. The rust-resistant polycarboxylate water reducer prepared by the present invention has good rust-resistant performance and water-reducing performance.

The invention relates to an extraction agent and an extraction method, and relates to the technical field of wet extraction of industrial solid waste, and the extraction agent comprises the following components in parts by mass: an extraction main agent, an anti-impurity stabilizer and an extraction aid; the extraction main agent comprises di (2-ethylhexyl) phosphate and mono (2-ethylhexyl) phosphate, the impurity-resistant stabilizer comprises an imidazoline derivative, a triazine derivative and dimethyl methylphosphonate, and the extraction assistant comprises isooctyl alcohol; the extraction method comprises the steps of ash ball preparation, impurity removal, extraction and the like. According to the extraction agent and the extraction method, interference impurities such as trace heavy metal ions, sulfides and cyanides generated due to component fluctuation in the purified ash of the calcium carbide furnace are selectively chelated, the impurities are prevented from being combined with the extraction main agent, and then the anti-interference stability of the extraction agent under the condition that the impurity content of the purified ash of the calcium carbide furnace fluctuates is improved; and the control difficulty in the production process is reduced.

The invention belongs to the technical field of antirust agents, and particularly relates to an imidazoline derivative as well as a preparation method and application thereof. The structural general formula of the imidazoline derivative is shown in the specification, and in the structural general formula, R1 is C10-C21 straight-chain alkyl, R2 is-C2H4NHCH2-, and R3 is C12-C18 straight-chain alkyl. The preparation method comprises the following steps: adding fatty primary amine into beta-ketoglutaric acid, and reacting to obtain an intermediate; adding alkyl amine ethyl imidazoline into the intermediate, simultaneously adding an aldehyde compound and a solvent, reacting at 120-140 DEG C for 3-5 hours, and carrying out reduced pressure distillation and filtration to obtain a target product. The imidazoline derivative disclosed by the invention has excellent oil solubility, anti-rust performance and antifriction performance.

The invention relates to the technical field of metal cleaning aids, and discloses an efficient decontamination acidic metal cleaning agent which comprises the following components in percentage by weight: 12-28% of non-oxidizing acid, 1.5-6% of a corrosion inhibitor, 4-12% of a surfactant, 0.8-3% of a complexing agent, 1.5-5% of a solubilizer, 2-8% of an organic solvent, 3-10% of a pH regulator, 0.1-0.6% of a defoaming agent, 0.2-1.2% of an antirust agent and the balance of deionized water. Through synergistic compounding of organic acid and inorganic acid and combination of a ternary corrosion inhibition system of benzotriazole, mercaptobenzothiazole and imidazoline derivatives, the decontamination efficiency and metal compatibility are remarkably improved, the synergistic effect of citric acid and sulfuric acid enables the corrosion rate of carbon steel to be reduced, meanwhile, the rust-proof time of a copper sheet is prolonged to 72 hours or above, and the rust-proof effect of the copper sheet is improved. The effect is derived from complementation of chelation of organic acid and strong solubility of inorganic acid and directional protection of the corrosion inhibition component on the multi-metal surface.

The invention relates to the field of lubricating oil, in particular to a compressor oil composition which is prepared from the following components in parts by weight: 0.005 to 0.2 part of an anti-rust agent, 0.05 to 1 part of an extreme pressure anti-wear agent, 0.01 to 0.5 part of a friction reducing agent, 3 to 8 parts of synthetic ester, 0.01 to 1 part of an antioxidant, 0.001 to 0.1 part of an anti-foaming agent and 90 to 97 parts of base oil. The anti-friction agent is a trimethylolpropane-triacid ester derivative, the anti-rust agent is formed by mixing an alkenyl succinic acid half-ester derivative and a carboxyl imidazoline derivative, and the anti-wear reagent at extreme pressure is formed by mixing triphenyl phosphate and an alkyl thiophosphate derivative. The antioxidant is formed by mixing any two of alkyl diphenylamine, alkyl phenyl-alpha-naphthylamine and alkyl hindered phenol. The invention further relates to a preparation method of the compressor oil composition. The compressor oil composition provided by the invention has excellent washing resistance and rust resistance.

The application discloses a silicon oil type immersion cooling liquid composition for a charging device cooling system, which comprises the following components in percentage by mass: 0.01-2% of a metal passivator, 0.01-2% of an anti-rust agent, 0.1-5% of a rubber protective agent, 0.005-0.05% of an anti-foaming agent, and the balance of dimethyl silicone oil, and the sum of the percentage by mass of the above components is 100%. The application further discloses a preparation method of the silicon oil type immersion cooling liquid composition, and specifically comprises the following steps: adding the metal passivator, the anti-rust agent, the rubber protective agent and the anti-foaming agent into the dimethyl silicone oil, and stirring at a temperature of 50-70 DEG C for 2-3 hours. The dimethyl silicone oil is used as a base oil, and a benzotriazole derivative containing triethoxysilane, a 2-aminoethyl heptadecenyl imidazoline derivative, an anti-foaming agent and a rubber protective agent are added, so that the prepared cooling liquid composition has excellent performance, and the copper corrosion resistance, the rust resistance and the material compatibility are greatly improved.

The present invention is applicable to the field of drug protection and provides a modified quaternary ammonium salt, a preparation method, and a corrosion inhibitor having the modified quaternary ammonium salt. The introduction of ester bonds and other organic groups in the modified quaternary ammonium salt with a bactericidal effect has better affinity for microbial cell membranes, enhances its destructiveness to cell membranes, and improves the bactericidal ability of the quaternary ammonium salt. At the same time, the addition of the modified quaternary ammonium salt not only fills the gaps in the film layer formed by the imidazoline derivative on the metal surface, but also increases the thickness of the film layer, improves the shielding ability of the corrosion inhibitor film layer against corrosive media, and enhances the corrosion inhibition effect. The bactericidal corrosion inhibitor in the present invention is mainly used for corrosion protection of ground gathering and transportation pipelines in the process of oil and gas field development against the coexistence of bacterial corrosion and CO2 corrosion, and has the advantages of low dosage, significant effect, and low cost.

The invention belongs to the technical field of lubricating oil additives, and particularly relates to a fluorine-containing imidazoline derivative lubricating oil additive as well as a preparation method and application thereof. The fluorine-containing imidazoline derivative lubricating oil additive disclosed by the invention has a chemical structure as shown in a formula (I). The novel fluorine-containing imidazoline derivative lubricating oil additive provided by the invention can be completely dissolved in fluoroether oil, so that the antirust performance of the lubricating oil additive is greatly improved, and the stability and the oxidation resistance of the lubricating oil additive are excellent; the invention also provides a preparation method of the fluorine-containing imidazoline derivative lubricating oil additive, the yield of the product prepared by the method is more than 85%, the raw materials are simple, the cost is low, the process is simple, and the fluorine-containing imidazoline derivative lubricating oil additive has a wide application prospect. Wherein R is a linear chain or branched chain alkyl group of C1-C12; r1f is CF3 (OCF2CF2) m (OCF2) nCF2, m is any integer from 5 to 9, and n is any integer from 10 to 16.

The invention provides a chromium-free high-temperature anti-oxidation passivator for electrolytic copper foil, and belongs to the technical field of metal surface treatment. The chromium-free high-temperature anti-oxidation passivator for the electrolytic copper foil takes water as a dispersing agent, and comprises the following components: 3-6g / L of a corrosion inhibitor, 5-20g / L of an antioxidant, 0.2-1g / L of a stabilizer, 0.05-0.5 g / L of a surfactant and a pH regulator, and the pH value of the chromium-free high-temperature anti-oxidation passivator for the electrolytic copper foil is 9-11; wherein the antioxidant comprises phytate, an imidazoline derivative and a nano reinforcing agent in a mass ratio of (2-5): (1-3): (0.1-0.5), through a synergistic mechanism of chemical chelation, physical anchoring, nano filling and oxygen vacancy regulation and control, the high-temperature resistance of the film layer is realized on the premise of no chromium and environmental protection, and a key technical guarantee is provided for manufacturing of the high-performance lithium battery copper foil.

The invention provides an anti-rust oil composition and a preparation method thereof. The anti-rust oil composition comprises the following components: (A) an imidazoline derivative; (B) an extreme pressure anti-wear agent; (C) an antioxidant; (D) a corrosion inhibitor; (E) optionally an anti-foaming agent; (F) a major amount of a lubricating base oil; the structure of the imidazoline derivative is shown as a formula (I): # imgabs0 #, wherein the definition of each group is shown in the specification. The anti-rust oil composition disclosed by the invention has a relatively low acid value and pour point, and also has excellent anti-rust performance, oxidation resistance and low volatility.

The invention provides a worm and gear oil composition and a preparation method thereof. The worm and gear oil composition comprises: (a) an imidazoline derivative; (b) a sulfur-containing extreme pressure anti-wear agent and / or a phosphorus-containing anti-wear agent; (c) a friction modifier; (d) a demulsifying agent; (e) lubricating base oil; wherein the structure of the imidazoline derivative is shown as a formula (I): # imgabs0 #, wherein the definition of each group is shown in the specification. The worm and gear oil composition disclosed by the invention has excellent oxidation stability, extreme pressure antiwear property, antifriction property, demulsibility and corrosion and rust resistance, can be blended into oil products with different viscosity grades such as N100, N150, N220, N320 and N460, and is applied to lubrication of various worm and gear gearboxes.

The urea-based lubricating grease provided by the invention has excellent oxidation resistance, corrosion and rust resistance and colloid stability. The urea-based lubricating grease disclosed by the invention is prepared from the following components in percentage by weight based on the total weight of the lubricating grease: 0.1 to 10 percent of imidazoline derivative, 3 to 30 percent of urea-based thickening agent and 65 to 95 percent of lubricating base oil, wherein the structure of the imidazoline derivative is shown as a formula (I), in the formula (I), n is an integer between 1 and 10, and each R group is independently selected from C2-C5 alkylene; the R0 group is selected from C15-C20 alkyl, cycloalkyl or alkenyl; and each R'group is independently selected from alkyl groups of C1 to C20, aryl groups of C6 to C10, and aryl groups of C6 to C10 substituted by straight chain or branched chain alkyl groups of C1 to C10.

The invention belongs to the technical field of oil field chemical material preparation, discloses a preparation method of a chemical applied to an oil field, and aims to overcome the defects that an existing oil field corrosion inhibitor is single in function and cannot synchronously cope with the problems of corrosion, microorganism breeding and scaling. The method comprises five steps of raw material pretreatment, corrosion inhibition main agent synthesis, functional component compounding, nanoparticle doping and post-treatment. The method comprises the following steps: preparing seven raw materials including 25-40 parts by weight of an imidazoline derivative and the like, and ultrasonically dispersing nano silicon dioxide in ethanol to obtain a nano dispersion liquid; synthesizing a corrosion inhibition main agent from the imidazoline derivative and thiourea at 50-60 DEG C; adding dodecyl dimethyl benzyl ammonium chloride and polymaleic anhydride, and compounding at 70-80 DEG C; and finally, adding deionized water, stirring and filtering to obtain a finished product. The product has the functions of efficient corrosion inhibition, bacteriostasis and scale prevention, the metal surface film-forming performance is improved through nanometer doping, and the product is suitable for complex oilfield corrosion environments such as injection-production integration.

The present invention belongs to the field of pharmaceutical technology and specifically relates to a chiral metal complex, its preparation method, and its use as a catalyst for the synthesis of chiral imidazoline derivatives. The chiral metal complex of the present invention is shown in Formula I. The chiral metal complex of the present invention is used as a synthesis catalyst to achieve high yield and high stereoselectivity in the synthesis of chiral imidazoline compounds. Thus, the present invention provides a novel method for preparing chiral imidazoline compounds, which has the advantages of high efficiency, mild conditions, high atom economy (100%), and wide substrate compatibility, and has excellent application prospects. #imgabs0#

This invention relates to a method for preparing imidazoline derivatives using heterogeneous catalysis. The invention addresses the technical problem that existing methods for synthesizing imidazoline derivatives require transition metal catalysis and involve cumbersome reaction processes. The method comprises: 1. Preparing a photocatalyst using melamine and glyoxal; 2. Preparing the imidazoline derivative under blue LED light. This invention provides a simple one-step method for synthesizing imidazolines and their derivatives, using heterogeneous materials as photocatalysts. This method eliminates cumbersome synthesis steps, achieves high yields, and is environmentally friendly. The reaction can be carried out at room temperature and pressure under mild conditions, requires no transition metal catalysis, and achieves a yield of over 40%. It has advantages such as simple operation, safety, environmental friendliness, and low cost. This invention is used for the preparation of imidazoline derivatives.

The invention belongs to the technical field of oil field corrosion and protection, and particularly relates to an imidazoline derivative, a preparation method thereof, an anti-oxidation corrosion inhibitor and application of the anti-oxidation corrosion inhibitor. The high-temperature antioxidant corrosion inhibitor is prepared from the following components in percentage by weight: 30 to 40 percent of imidazoline derivative, 10 to 20 percent of phosphate (ester) salt, 5 to 15 percent of phenols, 5 to 10 percent of organic amine, 2 to 8 percent of surfactant and 20 to 40 percent of solvent. The corrosion inhibitor provided by the invention has the advantages of low toxicity of used components, small environmental pollution, low dosage and simple use method, can restrain the corrosion problem under the working conditions of high temperature (as high as 120 DEG C) and high oxygen content (as high as 1.75 MPa) at a lower cost, and has wide application prospects in the technologies of oil and gas field air flooding, air injection foam flooding, in-situ combustion and the like.

The invention provides an industrial gear oil composition and a preparation method thereof. The industrial gear oil composition comprises an imidazoline derivative, an antioxidant, an anti-wear reagent at extreme pressure, a metal corrosion inhibitor and a main amount of lubricating base oil, the structure of the imidazoline derivative is shown as a formula (I): # imgabs0 #, in the formula (I), n is an integer between 1 and 10, and each R group is independently selected from C2-C5 alkylene; the R0 group is selected from C15-C20 alkyl, cycloalkyl or alkenyl; and each R'group is independently selected from alkyl groups of C1 to C20, aryl groups of C6 to C10, and aryl groups of C6 to C10 substituted by straight chain or branched chain alkyl groups of C1 to C10. The industrial gear oil composition disclosed by the invention has excellent extreme pressure anti-wear performance and anti-oxidation and anti-corrosion performance, can be applied to industrial gear oil products with various viscosity levels such as 150, 220, 320, 460, 680, 1000 and the like, and is particularly suitable for being used as gear oil products with relatively high performance requirements on load bearing, shear resistance, service life and the like.

The invention relates to the technical field of preparation of neutralizing corrosion inhibitors, in particular to a high-temperature-resistant and acid-resistant neutralizing corrosion inhibitor and a preparation method thereof, and aims to solve the technical problems that the corrosion inhibition efficiency of an existing corrosion inhibitor is remarkably reduced in a high-temperature and strong-acid environment, the heat stability is insufficient, and effective components in the corrosion inhibitor are easy to decompose. According to the high-temperature-resistant and acid-resistant neutralizing corrosion inhibitor and the preparation method thereof, the organic phosphonate-imidazoline derivative composite corrosion inhibitor is uniformly loaded on the surface of a nano-carrier by controlling pressure, temperature and time conditions and supercritical CO auxiliary loading, so that the utilization rate and the corrosion inhibition effect of the corrosion inhibitor are remarkably improved; through synergistic compounding of ammonium molybdate and sodium tungstate and atomic layer deposition of an AlO protective layer, a compact passive film is formed on the surface of a compound, and the corrosion resistance and long-acting corrosion inhibition capacity of the corrosion inhibitor in a high-temperature acid environment are improved.

The invention relates to a methanol fuel antirust agent composition. The composition comprises boric acid ester, benzotriazole, an imidazoline derivative, a dinonyl naphthalene sulfonic acid derivative and base oil, the structure of the imidazoline derivative is shown in the specification, and the structure of the dinonyl naphthalene sulfonic acid derivative is shown in the specification. The corrosion inhibitor has an excellent corrosion inhibition effect on copper, aluminum, zinc, tin, steel and the like.

This invention relates to the field of corrosion and scale inhibition technology, specifically to a corrosion and scale inhibitor containing a heterocyclic compound. The heterocyclic compound is an imidazoline derivative grafted onto a polyaspartic acid polymer. The structural formula of the imidazoline derivative is as follows: R is a C1-C1 substituent or unsubstituent substituent. 30 The hydrocarbon group, wherein the substituent is one or more of hydroxyl, carboxyl, alkoxy, nitro, amino, sulfonic acid, aldehyde, and cyano groups, has a significant synergistic effect when heterocyclic compounds are used in combination with organophosphorus scale and corrosion inhibitors, resulting in better scale and corrosion inhibition and corrosion suppression.

The invention discloses a composite imidazoline corrosion inhibitor for Q235 steel in a pickling maintenance process. The corrosion inhibitor comprises the following components in percentage by mass: 3%-8% of an imidazoline derivative (IM-TH), 0.1%-1% of potassium iodide (KI), 1%-2% of urotropine, 0.5%-2% of sodium molybdate and 89%-94% of absolute ethyl alcohol. The IM-TH is obtained by reacting thiophene-2-formaldehyde with ammonia water to prepare an intermediate, and then carrying out base catalysis cyclization, extraction, crystallization and purification. According to the corrosion inhibitor, a compact adsorption layer is formed on the surface of metal through N and S heteroatoms of IM-TH and a pi electron system, KI enhances anodic passivation, sodium molybdate promotes formation of a passive film, urotropine fills up the defects of a film layer, and ethyl alcohol improves the solubility and the film forming speed. The corrosion inhibitor has the advantages of high efficiency, stability, environmental protection and the like, and is suitable for industrial pickling corrosion prevention.

The invention provides a hydraulic oil composition and a preparation method thereof. The hydraulic oil composition of the present invention comprises: (A) an imidazoline derivative; (B) an anti-wear agent; (C) an antioxidant; (D) a metal deactivator; (E) a demulsifier; (F) an anti-foaming agent; (G) base oil; wherein the structure of the imidazoline derivative is shown as a formula (I), in the formula (I), n is an integer between 1 and 10, and each R group is independently selected from C2-C5 alkylene; the R0 group is selected from C15-C20 alkyl, cycloalkyl or alkenyl; and each R'group is independently selected from C1-C20 alkyl groups. The hydraulic oil composition disclosed by the invention has excellent anti-rust and anti-corrosion properties, oxidation resistance, wear resistance and long-term stability, and is long in service life.

The application provides an anti-corrosion composition and application thereof. The anti-corrosion composition mainly comprises imidazoline derivatives, acetylenic alcohol derivatives, deoxidizing agents and metal salts, and secondly comprises surfactants and solvents. The anti-corrosion composition has good film forming performance, high anti-corrosion efficiency, can effectively prevent corrosion of carbon dioxide, hydrogen sulfide, oxygen and chloride ions, can be used as an anti-corrosion agent to effectively protect natural gas pipelines, and has the advantages of easy availability of raw materials, low cost, simple preparation method and application in the field of natural gas pipeline corrosion prevention.

The invention relates to the technical field of chemical environment-friendly materials and industrial corrosion protection, in particular to an organic amine neutralizer of an atmospheric and vacuum distillation unit and a preparation method of the organic amine neutralizer. 15 to 25 parts of alkyl guanidyl lipopeptide; 10 to 20 parts of a double-response metal organic framework; 5 to 12 parts of electromagnetic induction carbon nanotube microcapsules; 3-8 parts of a photocatalytic composite film; 2 to 6 parts of bionic zirconium oxide nanocrystals; 1-4 parts of a fungal metabolite; 2 to 5 parts of organic silicon phosphazene copolymer; 10 to 20 parts of a deep eutectic solvent; and 5-10 parts of a bio-based glycol ether solvent. All the components realize efficient neutralization, dynamic response protection and environmental friendliness on an acidic corrosion medium through a physical and chemical synergistic mechanism, so that the service life of an atmospheric and vacuum distillation unit under high-temperature and high-pressure working conditions is remarkably prolonged, and the maintenance cost is reduced.

This invention belongs to the field of photoresist technology, specifically disclosing a positive photoresist stripping solution, which, by mass percentage, comprises the following components: 35-60% polar organic solvent, 10-20% organic base, 3-6% metal protectant, 1.5-3% imidazoline derivative, 0.5-2% γ-piperazinylpropylmethyldimethoxysilane, 0.5-2.5% sodium borate, 0.5-1% surfactant, and the balance being water. This invention provides a positive photoresist stripping solution whose components work synergistically, resulting in fast stripping speed, low residual photoresist rate, and good protection of copper substrates.

The invention belongs to the technical field of biological medicine, and relates to a paeonol imidazo ring derivative and a chlorination preparation method and application thereof. The chemical structure is shown as a formula I # imgabs0 #, X is selected from H, Cl and Br, and Y is C or N. The compound provided by the invention is novel in structure, not only has relatively high anti-inflammatory activity, but also can eliminate side effects such as pungent smell and pungency and improve compliance; meanwhile, the preparation method of the compound is simple to operate and suitable for industrial production.

The invention discloses an oilfield sewage treatment composite agent which comprises the following components in percentage by mass: 25%-35% of imidazoline derivative, 15%-25% of organic amine, 20%-30% of organic phosphonic acid, 10%-15% of polyaspartic acid, 8%-12% of alkyl modified quaternary ammonium salt, 3%-7% of glutaraldehyde, 3%-5% of sodium sulfite and 2%-4% of sodium hydroxide. The invention further discloses a preparation process of the oil field sewage treatment composite agent. Through the synergistic effect of all the components of the composite agent, the corrosion rate is more effectively reduced, the scale inhibition rate is improved, bacteria are killed, dissolved oxygen is removed, the pH value is adjusted, it is ensured that sewage reaches the standard for treatment, meanwhile, the composite agent can adapt to the water quality characteristics of different oil field sewage, and a good treatment effect can be achieved on sewage with different mineralization degrees, pH values and bacterium contents.

The invention discloses an efficient composite scale and corrosion inhibitor and a preparation method thereof, and belongs to the technical field of corrosion protection of chemical equipment. The corrosion inhibitor is prepared by compounding a core component A, an auxiliary component B and a solvent, the core component A is a dual-modified polyaspartic acid derivative which is prepared by sequentially carrying out two-step ring-opening reaction on polysuccinimide, long-chain alkyl quaternary ammonium salt and a modifier containing sulfur and nitrogen, and quaternary ammonium cations, a hydrophobic long chain and a strong coordination group are introduced into a molecular side chain at the same time. The auxiliary component B is selected from at least two of azoles, organic phosphonic acid and imidazoline derivatives. The solvent is selected from one or more of water and low-carbon alcohol. The composite scale and corrosion inhibitor is designed for oil-water-acid-chlorine multiphase complex corrosive media in a styrene device, shows excellent corrosion and scale inhibition performance on carbon steel equipment under low filling concentration, and is environment-friendly.