93 results about "Allyl chloride" patented technology

The invention provides a modified chitosan flocculant for slime water treatment. The modified chitosan flocculant is prepared from the following raw materials: chitosan, dimethyl diallyl ammonium chloride, acrylamide, acetic acid and potassium persulfate. The invention also provides a preparation method of the modified chitosan flocculant for slime water treatment. The preparation method comprises the following steps: dissolving chitosan in a dilute acetic acid solution with the mass concentration of 60%, and stirring; adding acrylamide and dimethyl propyl chloride cyclic amine into the mixed solution, uniformly stirring, adding a potassium persulfate solution with the mass concentration of 4%, and introducing nitrogen for 20 minutes; then carrying out microwave reaction, and cooling to room temperature after the reaction is completed; adding absolute ethyl alcohol, centrifuging for 10 minutes, taking out, and continuously soaking in absolute ethyl alcohol for 12 hours, so as to obtain a final insoluble substance which is a graft polymer CS-g-ADM; and drying the polymer in a drying box at 105 DEG C until no weight loss occurs, and then grinding and storing. The flocculating agent disclosed by the invention has relatively good flocculability.

The invention discloses a preparation method and application of a bio-based zinc adenine salt environment-friendly PVC heat stabilizer, and belongs to the field of fine chemical synthesis and plastic additive application. The nitrogen-containing organic metal heat stabilizer adenine zinc complex is prepared by taking adenine and zinc acetate as main raw materials through a one-step method. The method is simple and environment-friendly in preparation process, easily available in raw materials and suitable for industrial production. The prepared heat stabilizer zinc adenine is used as a heat stabilizer, can effectively absorb hydrogen chloride generated by PVC thermal decomposition, and can replace allyl chlorine atoms, so that the heat stability of a PVC product is improved, PVC has more excellent heat stability, and the heat stabilizer is expected to replace a traditional commercially available heat stabilizer.

The invention discloses an antistatic polyester fiber and a preparation method thereof, and relates to the field of fibers. When the antistatic polyester fiber is prepared, N, N-dimethylethanolamine reacts with allyl chloride, and then dichloro phthalocyanine silicon is grafted to obtain modified silicon phthalocyanine; polymerizing terephthalic acid, itaconic acid and ethylene glycol, and reacting with fluorescein isothiocyanate and modified silicon phthalocyanine in sequence to obtain modified polyester chips; the preparation method comprises the following steps: reacting phosphonitrilic chloride trimer with 3-hydroxy-5-nitropyridazine, and reducing to obtain a flame retardant; and carrying out melt spinning on the modified polyester chips and a flame retardant, and reacting to obtain the antistatic polyester fiber. The antistatic polyester fiber prepared by the invention has excellent antistatic property, antibacterial property, flame retardance and mechanical property.

The invention discloses a synthesis method of allyl phosphonic acid diester. According to the method, phosphorous acid diester and an allyl chloride compound are used as raw materials and react in the presence of a specific transition metal catalyst and alkali under the conditions of normal pressure and 45-60 DEG C to obtain the allyl phosphonic acid diester. The method has the advantages of mild reaction conditions, simple operation, high product yield (90-99%), no by-product, no generation of halogenated alkane gas and easy industrial production, and is suitable for the fields of polymer flame retardants, electronic materials, pesticide and medicine intermediates and the like.

The invention belongs to the technical field of organic matter synthesis, and particularly relates to a preparation method of 2-(2 '-hydroxy-3'-methallyl-5 '-methylphenyl) benzotriazole, in particular to a preparation method of cresol triazole trisiloxane. The invention relates to a preparation method of 2-(2 '-hydroxy-3'-methallyl-5 '-methylphenyl) benzotriazole, which comprises the following steps: mixing cresol trozole, methyl allyl chloride, Lewis acid and a first polar organic solvent, and carrying out Friedel-Crafts alkylation reaction to obtain the 2-(2'-hydroxy-3 '-methallyl-5'-methylphenyl) benzotriazole. When the 2-(2 '-hydroxy-3'-methallyl-5 '-methylphenyl) benzotriazole is prepared, the conventional Claisen rearrangement reaction is replaced, and the 2-(2'-hydroxy-3 '-methallyl-5'-methylphenyl) benzotriazole is prepared by adopting the Friedel-Crafts alkylation reaction of cresol trozole, so that the safety risk of process operation is reduced.

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 the technical field of engineering plastics, and provides allyl functionalized polyphenyl ether as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing dihydroxy-terminated polyphenyl ether, chloropropene, alkali, a catalyst, a polymerization inhibitor and an organic solvent for reaction to obtain allyl functionalized polyphenyl ether; the catalyst is prepared from a combination of p-toluenesulfonate, iodide and a 1, 3, 2-diazaphosphoropentene substance; the organic solvent is a mixed solvent of a polar solvent and a non-polar solvent. Under the synergistic action of various catalysts, the reaction of chloropropene and the terminal hydroxyl of the dihydroxyl-terminated polyphenyl ether is realized, and the obtained allyl functionalized polyphenyl ether is high in unsaturation degree and high in crosslinking density after curing, so that the allyl functionalized polyphenyl ether shows more excellent performance. The allyl functionalized polyphenyl ether prepared by the invention is an ideal matrix resin material for high-frequency and high-speed electronic products, and has a wide application prospect.

The application relates to a preparation method of BOPP waste discharge adhesive tape and belongs to the technical field of adhesive tape. BOPP raw materials, an anti-blocking agent and color master batch are uniformly stirred and mixed, then are sent into an extruder for extrusion and chilling forming; the formed adhesive tape is longitudinally stretched, transversely stretched, pulled, subjected to surface corona treatment, wound, subjected to aging treatment, cut and packaged to obtain the BOPP waste discharge adhesive tape; the anti-blocking agent is prepared through polymerization reaction, centrifugal separation and drying by using a methacrylate, a methallyl nickel chloride dimer, 4-vinylbenzocyclobutene, a mercapto-beta-cyclodextrin and an initiator; the prepared BOPP waste discharge adhesive tape has excellent mechanical properties, low light transmittance and good light shielding performance.

The invention discloses epichlorohydrin and a preparation method thereof. Comprising the following steps: feeding a mixed solution containing chloropropene, hydrogen peroxide and a nonionic surfactant and a titanium silicalite molecular sieve TS-1 catalyst in a fixed bed reactor at a mass space velocity of 0.5-10h <-1 >, and reacting at 20-90 DEG C to obtain the epichlorohydrin. The dosage of the catalyst is 0.1-10 wt% of the chloropropene; the nonionic surfactant is selected from at least one of alkyl glucoside, fatty glyceride, fatty acid sorbitan, polysorbate, polyoxyethylene fatty alcohol ether and nonylphenol polyoxyethylene ether; the molar ratio of the hydrogen peroxide to the nonionic surfactant is (1-50): 1; the molar ratio of chloropropene to hydrogen peroxide is (1-10): 1. The nonionic surfactant is added to promote mixing of the organic phase and the water phase, a large amount of solvent does not need to be added in a traditional process, and a large amount of energy consumption such as solvent evaporation and recovery is avoided; the conversion rate of hydrogen peroxide is greater than 95%, and the selectivity of epoxy chloropropane is 95-99%.

The invention belongs to the technical field of oil exploitation, and particularly relates to a fracturing fluid thickening agent as well as a preparation method and application thereof. The preparation method comprises the following steps: adding aminomethane tripropionic acid, ethanol and allyl chloride into a first reactor, carrying out a heat preservation reaction, and carrying out reduced pressure distillation to obtain a first functional monomer; adding 3-amino-1, 5-naphthalene disulfonic acid disodium salt, ethanol and allyl chloride into a second reactor, carrying out a heat preservation reaction, and carrying out reduced pressure distillation to obtain a second functional monomer; adding acrylamide, 1, 5-hexadiene-3, 4-diol, 3-[(3-acrylamidopropyl) dimethylammonium] propionate, a first functional monomer, a second functional monomer, monopotassium phosphate and water into a third reactor, dropwise adding an initiator, carrying out heat preservation reaction, adding ethanol, separating out precipitate, centrifuging to obtain a solid, and drying overnight to obtain the thickening agent. The thickening agent provided by the invention has the advantages of high apparent viscosity, strong shear resistance and strong antibacterial ability.

The application discloses a kind of adsorptive control materials for tunnel hole slag stone powder and application.The adsorptive control material is mixed by surface active component, complex component, anti-mud component three components according to 3-7:1:0.5-5 mass ratio;The surface active component is one or more of dodecyltrimethylammonium chloride, dodecyl dimethyl benzyl ammonium chloride, didodecyltrimethylammonium chloride;The complex component is one or more of sodium silicate, sodium hexametaphosphate;The anti-mud component is one or more of polyethylene glycol, β-cyclodextrin, dimethyl diallyl ammonium chloride.The adsorptive control material can improve the adsorption of tunnel hole slag stone powder, ensure the working performance of concrete.

The invention relates to the technical field of oil and gas field development, and particularly discloses an environment-friendly nano microemulsion retarded acid and a preparation method thereof, the environment-friendly nano microemulsion retarded acid comprises: a water phase, which is an acid-containing aqueous solution; the modified porous nano silicon dioxide powder has strong adsorbability and response release property; the retarder is formed by polymerizing acrylamide, dimethyl diallyl ammonium chloride, N-vinyl pyrrolidone, perfluoroalkyl acrylate and perfluoropolyether acrylate under the action of an initiator; an oil phase; an emulsifier; an emulsion stabilizer; and an iron ion stabilizer. The invention has the beneficial effects of high acid utilization rate, high acidity, multi-stage retarding, good acid etching effect, small damage, high acidification transformation efficiency, good safety and environmental protection property, 100-300nm emulsion particle size, good stability and no demulsification and layering after being placed at room temperature for 30 days, and the effective components of the acid liquor are wrapped by the microemulsion.

The invention provides an inorganic matter and cationic organic matter compounded clay stabilizer for water injection, and discloses that trimethyl monoallyl ammonium chloride is used as a raw material, and polymerization in the use process is prevented after a p-benzoquinone polymerization inhibitor is added, so that cationic monomer micromolecules containing double bonds are used as an organic clay stabilizer, and the stability of the organic clay stabilizer is improved. When being used together with the same raw material cationic organic matter with small molecular weight, namely 2-hydroxyethyl trimethyl ammonium chloride, the clay swelling prevention agent has the performance of preventing clay swelling, anti-scouring capability and long-term effect, and has better performance of preventing clay swelling after being compounded with cheap inorganic raw materials, namely aluminum chloride, dipotassium phosphate and industrial ammonium chloride; the prepared clay anti-swelling agent compounded by the inorganic matter and the cationic organic matter not only has excellent capacity of preventing clay swelling, but also has good anti-scouring capacity and good washing resistance, and an innovative demonstration effect is achieved for preventing damage of clay swelling and migration to a reservoir in water injection and improving the water injection recovery ratio.

The invention discloses epichlorohydrin and a preparation method thereof. Comprising the following steps: feeding a mixed solution containing chloropropene, hydrogen peroxide and an ionic surfactant and a titanium silicalite molecular sieve TS-1 catalyst in a fixed bed reactor at the mass space velocity of 0.5-10h <-1 >, and reacting at 20-90 DEG C to obtain the epichlorohydrin. The dosage of the catalyst is 0.1-10 wt% of the chloropropene; the ionic surfactant is selected from at least one of an anionic surfactant, a cationic surfactant and a zwitterionic surfactant; the molar ratio of the hydrogen peroxide to the ionic surfactant is (1-50): 1; the molar ratio of chloropropene to hydrogen peroxide is (1-10): 1. The ionic surfactant is added to promote mixing of the organic phase and the water phase, a large amount of solvent does not need to be added in a traditional process, and a large amount of energy consumption such as solvent evaporation and recovery is avoided; the conversion rate of hydrogen peroxide is greater than 95%, and the selectivity of epoxy chloropropane is 95-99%.

The present disclosure relates to a reactor for preparing allyl chloride. More specifically, the present disclosure relates to a reactor for preparing allyl chloride capable of improving the dispersibility of a raw material and inducing a uniform reaction within the reactor, thereby improving the selectivity and yield of allyl chloride.

The present application belongs to the technical field of wastewater treatment, and discloses a coal slime water treatment agent, a preparation method and application thereof. The coal slime water treatment agent comprises a coagulant aid G and a flocculant F prepared respectively. The coagulant aid G comprises the following components in mass percentage: 3-5% of sodium hypochlorite, 2-4% of water glass, 3-5% of active silicic acid, 1-2% of sodium carboxymethyl starch, and the balance of water, and the total amount of the coagulant aid G is 100%. The flocculant F comprises the following components in mass percentage: 2-5% of sodium alginate, 2-6% of polyethyleneimine, 2-5% of chitosan, 1-4% of hydroxyethyl cellulose, 2-5% of dimethyl diallyl ammonium chloride, 3-6% of tannic acid, and the balance of water, and the total amount of the flocculant F is 100%. When the coal slime water treatment agent is applied, the coagulant aid G is first added to perform micro-treatment and pre-flocculation on the coal slime water, and then the flocculant F is added to perform intensified flocculation, so that the components complement each other, synergistically promote flocculation and sedimentation of suspended matters, and efficient separation of the suspended matters and water is realized.

The invention relates to the technical field of wastewater treatment, and particularly discloses a purification treatment process for liquid crystal panel factory developing liquid waste. The purification treatment process for the liquid crystal panel factory developing solution waste liquid comprises the following steps: S1, adding a composite acid precipitation solution into the developing solution waste liquid, and meanwhile, carrying out ultraviolet irradiation treatment to obtain a suspension; s2, adding an amphiphilic coagulant aid into the suspension, stirring for reaction, and standing; the amphiphilic coagulant aid is an acrylamide-dimethyl diallyl ammonium chloride-glycidyl methacrylate terpolymer, and the amphiphilic coagulant aid is an acrylamide-dimethyl diallyl ammonium chloride-glycidyl methacrylate terpolymer; s3, carrying out centrifugal separation on the solution system after standing in S2 to obtain a tetramethyl ammonium salt solution; and S4, converting the tetramethyl ammonium salt solution into a TMAH solution by using bipolar membrane electrodeionization equipment. According to the treatment process, the purification and removal effect on the photoresist in the waste developing solution is effectively improved, and the recycling reliability of the TMAH is effectively enhanced.

The invention relates to the field of fluorescent probes, in particular to a CO fluorescent probe, a preparation method of the CO fluorescent probe and application of the CO fluorescent probe in a reagent for detecting inflammatory reaction in a living body. The probe takes DBX-OH with a push-pull electronic structure as a red fluorophore, and is connected with a recognition unit allyl chloroformate through a phenolic hydroxyl group of the DBX-OH. The detection mechanism is as follows: when the probe does not react with CO, the fluorescence of the probe is in a closed state due to a photoinduced electron transfer effect; when the allyl chloroformate and CO are subjected to specific reaction under the catalysis of Pd (0), the allyl chloroformate chain is broken and separated, and the PET process is inhibited, so that the strong red fluorescence of DBX-OH is recovered, and the'open 'type detection is realized. The probe has the outstanding advantages of red light emission, excellent water solubility, extremely low detection limit and the like. The method is successfully applied to in-vivo inflammation detection of mouse and zebra fish models, and the dual application potential of the method in the field of biomedical research is highlighted.

The application relates to the technical field of plugging removing agents for oilfield recovery, in particular to a foamed acid plugging removing system and a preparation method thereof. The foamed acid plugging removing system comprises a foamed acid component, a foaming agent and a gas phase component, and the foamed acid component comprises, in mass ratio, oxalic acid, phosphoric acid, triethanolamine, dimethyl diallyl ammonium chloride, acetic acid, disodium phosphate and sodium nitrite in a mass ratio of (10-12):(3-5):4:2:(1.5-2.5):0.05:0.05:1. The total weight m1 of the foamed acid component and the total weight m2 of the foaming agent satisfy the relationship m1:m2=100:(1.5-2.5). The volume V1 of the gas phase component and the total volume V2 of the foamed acid component satisfy the relationship V1:V2>=40:1. The foamed acid plugging removing system can improve the plugging removing effect of an acid plugging removing agent in a heterogeneous formation, so that the plugging material dissolution rate is above 65%, the dissolution rate is above 1.20g / (m 2 ·h), the foaming multiple is above 4.0, and the stable foaming time is above 420s.

The invention discloses a preparation method of a photocatalytic material for wastewater treatment, and belongs to the technical field of photocatalytic materials. The preparation method specifically comprises the following steps: S1, preparing TiO2 (at) GaP (at) Fe2O3; s2, absolute ethyl alcohol is added into TiO2 (at) GaP (at) Fe2O3, dimethyl diallyl ammonium chloride, modified graphene oxide and a silane coupling agent are added after ultrasonic dispersion, and after sufficient dispersion, a photocatalytic material is obtained through drying; the modified graphene oxide is graphene oxide grafted with disulfide bonds and polyacrylic acid. TiO2 is modified through GaP, ferric oxide powder, dimethyl diallyl ammonium chloride and modified graphene oxide, the photocatalytic material for wastewater treatment is obtained, and the photocatalytic material has high photocatalytic performance on wastewater containing methylene blue and / or rhodamine B under natural sunlight; meanwhile, the high photocatalytic performance is still kept after multiple times of recycling.

The present invention provides a method for synthesizing pentaerythritol triallyl ether. This method uses pentaerythritol and allyl chloride as starting materials, water as the reaction solvent, and reacts in two stages under strong alkaline conditions. Two kinds of phase transfer catalysts with hydrophilicity and lipophilicity are respectively used in the two-stage reaction. That is, a hydrophilic phase transfer catalyst is used in the initial stage of the reaction to ensure the catalytic efficiency and reaction efficiency, and an organic layer mainly composed of pentaerythritol monoallyl ether and pentaerythritol diallyl ether is obtained. Since the lipophilicity in the organic layer is enhanced, at this time, a lipophilic phase transfer catalyst is added, and then allyl chloride is continuously added for reaction, so as to obtain a crude product mainly composed of pentaerythritol monoallyl ether. The synthesis method of the present invention is simple in operation, uses water as the solvent, and the yield and selectivity of the obtained pentaerythritol triallyl ether product are relatively high. Moreover, the contents of other monoethers, diethers, and tetraethers can be respectively controlled below 0.05%, below 5%, and below 10%. At present, pilot-scale production has been carried out.

The application belongs to the technical field of organic synthesis, and specifically discloses a preparation method of dimethyl diallyl ammonium chloride, which comprises the following steps: under the condition that water exists, dimethylamine, an alkaline carrier and allyl chloride are mixed and subjected to a contact reaction to obtain a crude tertiary amine; the alkaline carrier comprises a carrier body and a carbonic acid alkali metal salt loaded on the carrier body; under the condition that an organic solvent exists, the crude tertiary amine and allyl chloride are mixed and subjected to a contact reaction. The method can effectively reduce the hydrolysis of allyl chloride and the generation of dimethylamine hydrochloride in the reaction process, the dimethyl diallyl ammonium chloride product contains almost no other hydrochloride impurities, and the reaction efficiency, the yield and the purity of the dimethyl diallyl ammonium chloride are improved.

The invention discloses a carbon dioxide pollution resistant filtrate reducer for water-based drilling fluid and a preparation method thereof, and belongs to the technical field of filtrate reducers for water-based drilling fluid. The preparation method comprises the following steps: sequentially dissolving monomers N 'N-dimethylacrylamide, sodium p-styrenesulfonate, dimethyl diallyl ammonium chloride, N-vinyl pyrrolidone and 2-acrylamide-2-methylpropanesulfonic acid in a molar ratio of 5: (3-8): (1-5): (0-4): (1-6) in a solvent, adding an alkali solution to adjust the pH value, heating, adding an initiator, drying, and crushing to obtain the filtrate reducer. The filtrate reducer for the water-based drilling fluid has strong competitive adsorption capacity with carbonate and bicarbonate, can improve the performance of the drilling fluid, increase the carbon dioxide containing threshold value and reduce the risk that the filtration performance is out of control after the drilling fluid is polluted by carbon dioxide, and is suitable for improving the formula of the filtrate reducer for the water-based drilling fluid.

Alkenyl halides, such as alkenyl bromides or alkenyl chlorides, are produced by a process comprising the steps of forming a reaction mixture containing alkyl dibromides or chlorobromoalkanes and allylmagnesium bromide and / or allylmagnesium chloride, and then producing the alkenyl halides in the reaction mixture.

The invention relates to the field of water treatment, and discloses a self-tracing type scale and corrosion inhibitor based on a novel fluorescent copolymer and a preparation method, and the scale and corrosion inhibitor comprises the following components: the novel fluorescent copolymer, an auxiliary polymer, a conventional AMPS copolymer, organic phosphonate, zinc salt and the balance of water. The novel fluorescent copolymer is obtained by carrying out copolymerization reaction on a fluorescent monomer B, acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid; and the fluorescent monomer B is prepared by reacting 4-chloro-1, 8-naphthalic anhydride with 3-dimethylaminopropylamine, reacting the product with sodium methoxide, and further reacting the obtained intermediate with chloropropene. And the auxiliary polymer is a lauryl methacrylate-N, N-dimethylaminoethyl methacrylate copolymer. According to the self-tracing type scale and corrosion inhibitor, the fluorophore is covalently bonded to a polymer main chain, accurate online monitoring of the concentration of the agent is achieved, and the self-tracing type scale and corrosion inhibitor has excellent scale and corrosion inhibition performance.

The invention belongs to the technical field of oil exploitation, and particularly relates to a composite blocking remover and a preparation method and application thereof. The composite blocking remover comprises the following components in percentage by weight, comprising the following components in percentage by weight: 5 to 8 percent of hydrochloric acid, 1 to 3 percent of fluoboric acid, 0.5 to 2 percent of acetic acid, 0.5 to 1 percent of dodecyl trimethyl ammonium chloride, 0.1 to 0.3 percent of potassium chloride, 0.3 to 0.8 percent of sodium erythorbate, 0.2 to 0.5 percent of tetrasodium glutamate diacetate, 1 to 2 percent of ethylenediamine tetraacetic acid, 0.1 to 0.2 percent of inositol hexaphosphate, 0.1 to 0.2 percent of cocoanut fatty acid diethanolamide, 0.3 to 0.5 percent of sodium dodecyl benzene sulfonate, 0.3 to 0.5 percent of dimethyl diallyl ammonium chloride, 0.1 to 0.2 percent of ethylene glycol monobutyl ether and the balance of water. The composite blocking remover provided by the invention does not generate the problem of secondary precipitation, slows down the reaction speed of acid rocks, effectively pushes a blocking removal measure solution into the deep part of a stratum, enlarges the blocking removal radius, realizes deep treatment of the stratum, improves the acidification effect, and prolongs the effective action time of acidification.

The invention relates to the technical field of preparation of 2-methylallyl magnesium chloride, in particular to a preparation method of 2-methylallyl magnesium chloride, which comprises the following steps: pretreatment and initial feeding, reaction initiation, continuous reaction and heat preservation, end point judgment and product transfer. Magnesium is activated through a zinc stearate ethanol solution, zinc stearate can form an ultra-thin selective adsorption layer on the surface of magnesium particles, the layer cannot completely isolate the reaction, the reaction rate can be regulated and controlled, the risks of bumping and material flushing caused by too violent local reaction are avoided, and meanwhile, the service life of magnesium particles is prolonged. Ethanol is used as a solvent to assist zinc stearate to be uniformly attached to the surface of magnesium, and the dispersity of magnesium particles can be improved when the ethanol is subsequently mixed with tetrahydrofuran; tert-butyl p-hydroxyanisole is added into 2-methylallyl chloride to serve as a stabilizer, free radicals possibly generated in a reaction system can be captured, and side reactions such as polymerization and oxidation of 2-methylallyl chloride are inhibited.

The invention belongs to the technical field of synthesis of organic compounds, and relates to a synthesis method of drometrisiloxane, which comprises the following steps: carrying out Williamson etherification reaction on an ultraviolet light absorber UV-P and methyl allyl chloride to obtain an intermediate I; carrying out Claisen rearrangement reaction on the intermediate I to obtain an intermediate II; and carrying out hydrosilylation reaction on the intermediate II and heptamethyltrisiloxane to obtain dromethicone, the Williamson etherification reaction comprises the following steps: dissolving an ultraviolet light absorber UV-P in an alcohol ether solvent, and reacting with methyl allyl chloride under the condition of an acid-binding agent. According to the synthesis method of the drometrisiloxane, the etherification reaction is efficient, simple and convenient, the hydrosilylation reaction catalyst is high in efficiency, the solvent system is green and economical, the overall process is high in yield and purity, and the product quality is excellent.

The invention belongs to the technical field of synthesis of epoxy compounds, and discloses a preparation method of (methyl) epichlorohydrin. The preparation method comprises the following steps: (1) after tungstic acid reacts with hydrogen peroxide A, adding phosphoric acid for continuous reaction to prepare peroxyphosphotungstic acid; and (2) mixing the peroxy phosphotungstic acid prepared in the step (1) with allyl chloride or methyl allyl chloride dissolved with quaternary ammonium salt and a pH regulator, and adding hydrogen peroxide B for reaction to prepare epoxy chloropropane or methyl epoxy chloropropane. By adopting the preparation method provided by the invention to prepare the (methyl) epichlorohydrin, the procedures of liquid separation, drying and the like in the catalyst preparation process are omitted, the process steps are few, and hydrogen peroxide and a large amount of solvent can be saved while the process is simplified; and the prepared catalyst is high in selectivity, good in reuse effect and convenient to recycle and reuse.

This invention relates to the field of oil and gas field drilling and cementing technology, and in particular to a broad-spectrum anti-fouling isolation fluid for ultra-deep well cementing and its preparation method, comprising the following components: a zwitterionic nanocomposite polymer, a composite flushing agent, a weighting agent, and water; the zwitterionic nanocomposite polymer is an organic-inorganic hybrid copolymer with surface-silanized modified nano-silica as an inorganic crosslinking core, and polymeric segments copolymerized and grafted onto the surface of the inorganic crosslinking core; the monomers of the polymeric segments include N,N-dimethylacrylamide, 2-acrylamido-2-methylpropanesulfonic acid, N-vinylpyrrolidone, dimethyl diallyl ammonium chloride, and isopentenyl polyoxyethylene ether; the composite flushing agent contains alkyl glycosides and alkyl sulfobetaine surfactants.