107 results about "Cresol" patented technology

The invention belongs to the technical field of organic synthesis and separation, and particularly relates to a method for synthesizing phenolic resin from 2, 4 / 2, 5-methyl ethyl phenol. The invention provides a method for synthesizing phenolic resin from 2, 4 / 2, 5-methyl-ethyl phenol, which comprises the following steps: adding 2, 4 / 2, 5-methyl-ethyl phenol, aldehydes and a catalyst into a reactor, carrying out an anti-thermal insulation reaction, sampling and analyzing until the content of 2, 5-methyl-ethyl phenol is less than or equal to 0.5% and is qualified, heating, decompressing and dehydrating, steaming out unreacted 2, 4-methyl-ethyl phenol and water, and dehydrating to 100-200 DEG C to obtain linear 2, 5-methyl-ethyl phenolic resin; adding a catalyst into the steamed material, heating to completely react the reacted 2, 5-methyl ethyl phenol (when formaldehyde in the steamed material is insufficient, a small amount of formaldehyde can be supplemented), adding a non-water-soluble solvent for extraction and layering, and treating a water layer in a wastewater treatment workshop; and rectifying the oil layer to obtain 99% 2, 4-methyl ethyl phenol or pesticide intermediate 4-ethyl-2-cresol.

The application discloses a preparation method of a key intermediate of dapagliflozin, and belongs to the technical field of preparation of medical intermediates. The preparation method of the key intermediate of dapagliflozin comprises the following steps: 1, 1-ethoxy-4-methylbenzene is prepared by using p-cresol, sodium hydroxide and diethyl sulfate; 2, (4-ethoxybenzyl) phenyl sulfide is prepared by using 1-ethoxy-4-methylbenzene, thiophenol, a palladium catalyst, an alkali and an oxidant; 3, 1-benzyl-4-ethoxybenzene is prepared by using (4-ethoxybenzyl) phenyl sulfide under a hydrogen atmosphere; 4, 4-ethoxy-2'-chlorobenzhydrol is prepared by carrying out chlorination reaction on 1-benzyl-4-ethoxybenzene; and 5, 5-bromo-2-chloro-4'-ethoxybenzhydrol is prepared by carrying out bromination reaction on 4-ethoxy-2'-chlorobenzhydrol. The yield and purity of 5-bromo-2-chloro-4'-ethoxybenzhydrol prepared by the method are higher, the process is safer, and the production cost is reduced.

The invention relates to the technical field of medical medicines, and discloses a composition for relieving eye strong light burn and a preparation method thereof. The composition is prepared from the following components in percentage by weight: 0.5 to 3 percent of sodium aliphatate, 30 to 50 percent of corn starch, 25 to 45 percent of talcum powder, 1 to 4 percent of cresol, 5 to 15 percent of flos chrysanthemi indici, 0.05 to 0.5 percent of radix scutellariae, 0.01 to 0.1 percent of flos carthami, 0.1 to 1 percent of aqueous solvent and the balance of water. The preparation method comprises the following steps: crushing medicinal materials; preparing a water-phase matrix containing a water-based solvent and sodium aliphatate; performing dry mixing on corn starch, talcum powder and the medicinal material fine powder; and mixing the water phase and the solid phase, adding cresol, homogenizing, adjusting the pH value, and sterilizing to obtain a paste or pasty composition. The composition can effectively relieve ocular surface pain, lacrimation and foreign body sensation caused by strong light burn through cooperation of multiple ways of physical protection, anti-inflammatory repair and oxidation resistance.

This invention relates to a method for testing the resistance to phenolic yellowing of carbodiimide anti-hydrolysis agent powder and its application. The testing method includes: (1) grinding the sample to be tested and spreading it evenly in a petri dish; (2) placing 2,6-di-tert-butyl-p-cresol in a petri dish of the same size as in step (1); (3) placing the test reagent in a container; (4) placing the petri dish from step (1), the petri dish from step (2), and the container from step (3) into a sealed container for aging; (5) immediately using a colorimeter to detect the yellowing index of the sample after aging in step (4). The method of this invention can accurately detect powdered or crystalline carbodiimide anti-hydrolysis agents, solving the problem that it is currently impossible to accurately detect the phenolic yellowing resistance of powdered samples.

The invention relates to the field of lubrication of ball screws, in particular to long-life creep-resistant lubricating grease for a high-precision ball screw, which comprises the following components in parts by weight: 65 parts of polyolefin, 5-10 parts of pentaerythritol ester, 5-10 parts of isocyanate, 2-5 parts of amine chain extender, 5 parts of PTFE (polytetrafluoroethylene), 1.0-1.5 parts of diphenylamine, 0.1-0.5 part of 2, 4-diphenyl-1, 3-pentanediol monoisobutyrate, 0.1-0.5 part of antioxidant, 0.1-0.5 part of antioxidant and 0.1-0.5 part of lubricant. The composite material is prepared from the following components in parts by weight: 0.5 to 1 part of 2, 6-butylated hydroxytoluene, 1.5 to 2 parts of molybdenum isocaprylate, 0.5 to 1 part of molybdenum bis (2-ethylhexyl) dithiocarbamate, 1 to 2 parts of zinc dialkyl dithiophosphate, 3 parts of calcium petroleum sulfonate, 1 to 1.5 parts of polyisobutene, 0.2 to 0.5 part of benzotriazole and 0.1 to 0.3 part of polymethacrylate. The isocyanate comprises HDI and IPDI, and the amine chain extender comprises TETA and TEPA. According to the invention, isocyanate and the amine chain extender react to form a polyurea macromolecular chain, and a high-energy hydrogen bond network is formed, so that the lubricating grease has relatively high creep resistance; the anti-creep performance is further enhanced through cooperation with the PTFE particles; meanwhile, through cooperation with diphenylamine, the oxidation resistance is promoted, the consumption is reduced, and the service life of the lubricating grease is longer.

The utility model relates to the technical field of cresol filtering and purifying, and particularly discloses a small cresol purifying device with a two-stage filtering structure, which comprises a processing box, supporting legs are fixedly connected to the bottom surface of the processing box, a first-stage filtering assembly is mounted at the upper part in the processing box, and a second-stage filtering assembly is mounted at the lower part in the processing box. The first-stage filtering assembly is used for primarily screening and purifying cresol raw materials, the first-stage filtering assembly is used for filtering large impurities in the cresol raw materials, the second-stage filtering assembly is installed on the lower portion of the interior of the processing box, and the second-stage filtering assembly is used for secondarily screening and purifying the cresol raw materials screened and purified by the first-stage filtering assembly; the second-stage filtering assembly and the first-stage filtering assembly are matched with each other, so that the cresol filtering and purifying effect is better. By arranging the second-stage filtering assembly, the cresol raw material can be screened once through the first-stage filtering assembly under the action of centrifugal force and then can be subjected to vibration screening through the second-stage filtering assembly, and the filtering and purifying effect of the cresol raw material can be further better.

This invention belongs to the field of diesel additive technology, and particularly relates to a diesel cetane number improver and its preparation process, comprising the following steps: mixing isooctyl nitrate, n-hexadecane, n-eicosane, oleic acid, and 2,6-di-tert-butyl-p-cresol to obtain a premix; mixing anhydrous ethanol, glycerol, and an emulsifier, adding the premix, reacting, and drying to obtain microparticles; mixing ethyl acetate, isopropanol, n-butanol, and an emulsifier, adding hexadecyl alcohol and EVA-210 to dissolve, to obtain a film-forming solution; mixing ethyl acetate and isopropanol, adding the microparticles and the film-forming solution, removing ethyl acetate, isopropanol, and n-butanol, adding the solution to liquid paraffin and mixing to obtain the diesel cetane number improver. The diesel cetane number improver prepared by this invention can prevent isooctyl nitrate from directly contacting the external environment, slow down the generation rate of free radicals, effectively improve and stabilize the cetane number of diesel, and maintain the cetane number of diesel at a high level for a longer period of time.

The invention discloses a preparation method of a cresol trozole trisiloxane intermediate, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: by taking 2, 6-dibromo-4-methylphenol as a raw material, reacting with 3, 4-dihydropyran under the action of p-toluenesulfonic acid, so as to generate an intermediate 2-(2, 6-dibromo-4-methylphenoxy) pyran; reacting with sodium methoxide under the action of a catalyst to generate an intermediate 2-(2-bromo-4-methyl-6-methoxyphenoxy) pyran; then generating a Grignard reagent, carrying out coupling reaction on the Grignard reagent and 3-bromine-2-methallyl, finally reacting with benzotriazole lithium salt, and carrying out acidolysis deprotection to obtain the cresol trozole trisiloxane intermediate. The raw materials are available in the market, the overall yield is high, and a route reference is provided for synthesis of the compounds.

The invention relates to the technical field of organic synthesis and separation, particularly discloses a method for synthesizing phenolic resin and extracting para-phenol by an acid process, and solves the problem that common commercial mixed phenol cannot be directly used for synthesizing high-quality phenolic resin and cannot be used for extracting para-phenol by two steps of phenolic resin synthesis, para-phenol crude separation and para-phenol refining. The application of the phenolic resin in chemical products is limited; the production cost of synthesizing phenolic resin from phenol is high; and the economic benefit needs to be improved. And meanwhile, high-quality phenol and o-cresol can be produced while the coalified phenol and the mixed phenol which are low in price are used for replacing petrochemical phenol to produce the phenolic resin, so that the method has certain economic benefits.

The application belongs to the technical field of chemical industry, and particularly relates to a mixed cresol separation method, which comprises selective oxidation, filtration, neutralization, secondary filtration and rectification processes in sequence. The selective oxidation comprises: adding mixed cresol, sodium hydroxide, sodium methoxide, a solvent and a catalyst into an oxidation kettle, heating, and introducing oxygen for selective oxidation. In the selective oxidation step, sodium methoxide is added, which can react with water obtained in a salification reaction step (i.e. a reaction step of sodium hydroxide and mixed cresol to generate sodium phenate and water) to generate methanol and sodium hydroxide, thereby promoting the selective oxidation reaction and improving the yield.

The invention discloses a composite catalyst and a preparation method thereof, and a preparation method of 2, 3, 6-tricresol. The structural formula of the composite catalyst disclosed by the invention is Fe3O4-M-g-C3N4, wherein M is Fe2SiO4 and / or Fe2TiO5. The composite catalyst disclosed by the invention has the advantages of high catalytic activity, high catalyst stability, long service life and few byproducts in a reaction for preparing 2, 3, 6-tricresol; the components introduced into the composite catalyst are cheap, easy to obtain and harmless to a human body, the preparation process is safe and environment-friendly, the cost is low, the composite catalyst is safe to use, and the composite catalyst has a good application prospect.

The application provides a high epoxy value p-cresol formaldehyde epoxy resin and a preparation method thereof, and relates to the technical field of polymer material synthesis. The preparation method realizes precise control of a chemical reaction path through a synergistic process of "segmented temperature control polycondensation-gradient base epoxidation-compound phase transfer catalysis-in-situ water removal", which directionally inhibits main side reactions such as epoxy ring opening and phenolic hydroxyl etherification, significantly improves the ring closure efficiency, and finally obtains the p-cresol formaldehyde epoxy resin with the following performances: an epoxy value of 0.50-0.54 eq / 100g (more than 10% higher than that of a traditional process), a hydrolytic chlorine content of less than 0.03%, and a hydrolyzable chlorine content of less than 0.01%, reaching the electronic grade standard. Through the technical scheme, the industry pain points of many side reactions, low epoxy value, high hydrolytic chlorine content, poor product flame retardancy and large raw material consumption of the existing process are effectively solved.

The utility model relates to a process device for hydrocarbonylation reaction of m-cresol and p-cresol under catalysis of solid acid. An outlet of a premixing tank is communicated with a first centrifugal pump and then is communicated with the lower part of a reactor; a gas outlet of the first steel cylinder is communicated with the reactor; the lower part of the reactor is sequentially communicated with a second centrifugal pump and a liquid storage tank. The premixing tank is used for pre-stirring and mixing an m-cresol solution and a solid acid catalyst to form reaction slurry; the first centrifugal pump is used for introducing reaction slurry into the reactor; the high-pressure isobutene liquid in the first steel cylinder is depressurized into gas and then enters the reactor; cresol, a solid acid catalyst and isobutene are mixed in the reactor at a set temperature for a catalytic alkylation reaction; the second centrifugal pump is used for extracting the completely reacted alkylation mixed product out of the reactor, the alkylation mixed product is stored in the liquid storage tank, and the solid acid catalyst is left to stand and settled, so that in-situ separation of a liquid-phase product and a solid-phase catalyst is realized.

The application belongs to the field of functional material preparation and catalysis technology, and discloses a preparation method of an iron oxide catalyst, which comprises the following steps: dissolving an iron precursor and a promoter in water respectively to form uniform aqueous solutions; mixing the two aqueous solution systems and stirring to make them uniformly mixed; continuously heating and stirring the mixed aqueous solution to evaporate water; drying the gel-like substance, and then calcining at a specified temperature for 5h to obtain the iron oxide catalyst. The method of the application obtains the iron oxide catalyst with high catalytic performance by calcining the mixture of the promoter and the iron precursor, and uses the iron oxide catalyst to catalyze the methylation reaction of phenol and methanol. The application improves the conversion rate and selectivity of the reaction by improving mass transfer, increasing the specific surface area and the content of acid sites, and has the advantages of simple operation, good repeatability, low cost, phenol conversion rate of 94.4%, product 2,6-dimethylphenol selectivity of 50.1%, and o-cresol selectivity of 49.2%.

The application discloses a kind of for mixed cresol separation continuous amplification production process and method, belong to mixed cresol separation and purification field.This process solves the problem of low flow, difficult to control, temperature-resistant equipment selection difficult in early stage working condition exploration, proposes the design concept of "breathing mouth".Further, a kind of "exogenous" online detection system can effectively avoid the influence of analysis results due to excessive flow temperature, excessive pressure, high concentration, reduce the complexity of structure design;For the problem of large amount of desorbent, an efficient desorbent extraction system is proposed, which can realize efficient recovery of desorbent and separation and purification of m-cresol product.The process and method are scientific and reasonable, and can realize continuous production, and have important role in mixed cresol separation amplification production.At the same time, it also has wide applicability in other chemical amplification production, separation and purification fields.

The invention belongs to the technical field of environmental engineering and chemical separation, and particularly relates to a deep-eutectic solvent composition for efficiently extracting phenolic compounds and a preparation method of the deep-eutectic solvent composition. The deep-eutectic solvent composition for efficiently extracting the phenolic compounds, provided by the invention, consists of a hydrogen bond acceptor and a hydrogen bond donor in a molar ratio of (1-2): (1-9), the hydrogen bond donor comprises n-caprylic acid or n-hexyl alcohol; the hydrogen bond receptor comprises 1-ethyl-3-methylimidazole chloride or tetrabutylammonium bromide. The eutectic solvent composition has the advantages of high partition coefficient, low viscosity, high selectivity, rapid phase separation, environmental friendliness and the like, can efficiently extract phenol, resorcinol, o-cresol, m-cresol and p-cresol, and has single-stage extraction efficiency gt; the regeneration rate is high, and the method is suitable for high-concentration phenolic wastewater, polyhydroxy phenolic wastewater, continuous process and low-toxicity emission requirement scenes.

This invention discloses an ultrathin flame-retardant halogen-free epoxy fiberglass sheet and its preparation method, belonging to the technical field of epoxy fiberglass materials. The preparation process includes preparing a resin solution by mixing phosphorus-containing epoxy resin, bisphenol A phenolic epoxy resin, o-cresol phenolic epoxy resin, benzoxazine resin, phosphorus-containing phenolic flame-retardant curing agent, toughening agent, catalyst, coupling agent, and a mixed solvent. Composite fillers and flame-retardant synergists are added, and the mixture is dispersed at high speed and then impregnated with fiberglass cloth. After drying, a semi-cured sheet is obtained, which is then stacked and hot-pressed to obtain the finished product. Compared with existing technologies, the ultrathin fiberglass sheet obtained by this invention meets the UL94 V-0 halogen-free flame-retardant standard, has a high glass transition temperature, and maintains excellent electrical insulation performance and dimensional stability even at ultrathin thicknesses. During processing, the resin flow is uniform and there is no bubble delamination. This sheet is environmentally friendly and halogen-free, with excellent comprehensive performance, and is suitable for automotive insulation, electronic packaging, and printed circuit boards.

The invention discloses a preparation method and a preparation system of p-chloro-o-cresol, and the preparation method comprises the following steps: 1) adding dichloroethane into molten o-cresol, and adding a catalyst; (2) controlling the temperature to be 5-15 DEG C, and adding sulfuryl chloride into the material in the step (1) at different feeding speeds according to the reaction time and the reaction stage; and (3) after the reaction is finished, rectifying and purifying liquid of reaction materials to obtain the p-chloro-o-cresol. According to the present invention, the process is simple, the reaction condition is mild, the reaction is controlled, the selectivity is high, the ortho-cresol is subjected to preferential para-position chlorination, the reaction is sufficient, the selectivity is high, the polychlorination phenomenon is avoided, the phenol content and the isomer content in the crude product are low, the yield is high, and the large-scale production is easily achieved.

This invention relates to the field of road maintenance engineering technology, specifically disclosing a temperature-sensitive composite adhesive and a method for repairing damaged asphalt pavements. The temperature-sensitive composite adhesive uses ordinary emulsified asphalt as a base material, adding SBS modifier, styrene-butadiene rubber, a temperature-sensitive modifier, a stabilizer, and an antioxidant. The temperature-sensitive modifier is a melt blend of polyethylene glycol 4000 and polyethylene glycol 1000; the stabilizer is nano-montmorillonite; and the antioxidant is 2,6-di-tert-butyl-p-cresol. The proportions of the temperature-sensitive modifier and stabilizer are adjusted according to different climatic regions. The repair method using this adhesive includes the following steps: S1 gradient modification pretreatment of the bonding surface, S2 preparation and application of the temperature-sensitive composite adhesive, and S3 interface pressing and curing. The adhesive of this invention exhibits excellent high-temperature stability and low-temperature fluidity, resulting in high flexural and compressive strength of the repaired pavement. The interface is dense with no significant water seepage, meeting the needs for efficient and long-term repair of pavements with different climatic zones and varying degrees of damage, demonstrating good applicability.

The invention discloses an N and P co-doped charcoal-silicon dioxide composite material and application thereof in adsorbing phenols in oilfield wastewater, and belongs to the technical field of environmental functional materials. The composite material comprises a biochar matrix, silicon dioxide, and an N element and a P element which are co-doped on the surface of the material and in a skeleton. Silicon dioxide serves as a framework, the high-porosity structure of the material is supported and maintained, the thermal stability of the material is improved, rich surface active sites are introduced through co-doping of N and P, and the adsorption capacity of the material to phenolic pollutants is remarkably improved through the synergistic effect of the silicon dioxide and the N and P. The adsorption capacity of the material to typical oilfield phenols such as phenol, cresol, chlorophenol, nitrophenol and the like is 150-200 mg / g, the adsorption efficiency can reach 96% or above, and the recycling performance can be good through acid and alkali heat treatment. The invention effectively solves the problems of poor adsorption effect, high material cost, insufficient stability, secondary pollution and the like in oilfield wastewater phenol treatment.

This invention provides a positive photoresist composition and its application. The positive photoresist composition, by weight percentage, comprises: 20-35% cresol phenolic resin A, 3-15% cresol phenolic resin B, 5-10 wt% photosensitizer, 0.01-2% additives, and 50-70 wt% solvent. The weight-average molecular weight of cresol phenolic resin A is 15,000-30,000, and the weight-average molecular weight of cresol phenolic resin B is 5,000-10,000. The photosensitizer is an aromatic compound with a main absorption wavelength in the range of 365-436 nm and an absorption intensity of not less than 14 L / g·cm. The photoresist composition can adapt to different processing techniques for G-lines, H-lines, and I-lines. When the film thickness reaches 10-20 μm, it exhibits high chemical resistance and steepness, with a side morphology tilt angle of not less than 83° and a pattern resolution of 5-10 μm; it also has excellent electroplating resistance.

This invention belongs to the field of polymer materials and relates to a method for preparing a multifunctional emulsion antioxidant and its application, specifically to an emulsion antioxidant that also absorbs ultraviolet light and its application. A multifunctional emulsion-type antioxidant comprises the following components: a phenolic primary antioxidant, wherein the phenolic primary antioxidant comprises a mixture of p-cresol and dicyclopentadiene copolymer (TH-CPL) and triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] (antioxidant 245); a thioester secondary antioxidant; a UV absorber; a light stabilizer; a nonionic surfactant; and deionized water; wherein the UV absorber is N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidinium (UV-1), and the light stabilizer is a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidine) sebacate and 1-methyl-8-(1,2,2,6,6-pentamethyl-4-piperidine) sebacate (292).

The invention provides natural gas engine oil and a composite additive composition thereof, and the composite additive composition comprises: a detergent comprising magnesium sulfonate, calcium sulfonate and sulfurized calcium alkyl phenolate; the antioxidant comprises an amine type antioxidant and a phenol type antioxidant; the anti-wear agent is prepared from carbamic acid ester, phosphoric acid lauryl amine salt and tricresyl ester; a dispersant; the base number of the magnesium sulfonate is 395 to 420 mgKOH / g, the base number of the calcium sulfonate is 20 to 35 mgKOH / g, and the base number of the sulfurized calcium alkyl phenolate is 130 to 160 mgKOH / g. According to the natural gas engine oil, the sulfate ash content of the natural gas engine oil can be reduced, and the natural gas engine oil has relatively good oxidation resistance, detergency, dispersity, wear resistance and the like.

The application discloses a synthesis method of 4-ethyl-2-methylphenol and 5-ethyl-2-methylphenol. The method uses a small amount of meta-p-ethylphenol mixture and methyl alcohol to carry out fixed-bed catalytic methylation reaction, controls the reaction at a low methanol / ethylphenol ratio, a low ethylphenol conversion rate and a low temperature, and the methylation reaction mainly generates 4-ethyl-2-methylphenol, 5-ethyl-2-methylphenol, 3-ethyl-2-methylphenol, 3-ethyl-4-methylphenol and other products; the 4-ethyl-2-methylphenol / 5-ethyl-2-methylphenol mixture is reacted with formaldehyde to obtain linear methyl ethyl phenolic aldehyde resin and a pesticide intermediate 4-ethyl-2-methylphenol, or the 4-ethyl-2-methylphenol / 5-ethyl-2-methylphenol is subjected to tert-butylization, rectification, tert-butyl removal and rectification to obtain 99% 4-ethyl-2-methylphenol, 99.5% 5-ethyl-2-methylphenol and other products, so that the application field of coal-converted meta-p-ethylphenol mixture is expanded.

The invention belongs to the field of wastewater treatment, and particularly relates to a method for extracting high-concentration coal chemical phenolic wastewater by adopting 5-methyl-2-hexanone. The method comprises the following steps: acidizing the high-concentration coal chemical phenolic wastewater, and then adding 5-methyl-2-hexanone into the acidized wastewater for extraction. Experimental results show that the distribution coefficients D of the MIAK to phenol, o-cresol, m-cresol and p-cresol are not lower than 74, 74, 76 and 82 respectively, the single-stage extraction rate exceeds 97%, and the total removal rate after two-stage countercurrent extraction can reach 99.9%. The method is carried out at normal temperature and normal pressure, the extracting agent can be recycled for more than 10 times through reduced pressure distillation, and the method has the advantages of simplicity and convenience in operation, low energy consumption, rapidness in phase splitting, no secondary pollution and the like. Compared with an existing phenol-containing wastewater treatment technology, efficient removal and resource recycling of high-concentration phenolic substances are achieved, and the method is suitable for deep treatment and recycling of wastewater in the coal chemical industry and other industries.

The invention relates to the technical field of chemical engineering, in particular to a preparation method and application of a lithium aluminum tri-tert-butoxyhydride-tetrahydrofuran solution. Industrial-grade tert-butyl alcohol is purified through molecular distillation to obtain purified tert-butyl alcohol, the purified tert-butyl alcohol and anhydrous tetrahydrofuran are mixed to prepare a tert-butyl alcohol-tetrahydrofuran solution, and then the tert-butyl alcohol-tetrahydrofuran solution is prepared into the lithium aluminum tri-tert-butoxyhydride-tetrahydrofuran solution. The method comprises the following steps: mixing a lithium aluminum hydride solid with anhydrous tetrahydrofuran, and stirring to obtain a lithium aluminum hydride-tetrahydrofuran suspension; conveying the tert-butyl alcohol-tetrahydrofuran solution and the lithium aluminum hydride-tetrahydrofuran suspension into a microchannel reactor with ultrasonic waves through a double-plunger metering pump, and reacting to obtain a product solution; and stirring the product solution, adding 2, 6-butylated hydroxytoluene, and filtering to obtain a lithium aluminum tri-tert-butoxy hydride-tetrahydrofuran solution. The continuous flow reaction is assisted by ultrasonic waves, high-efficiency and high-selectivity preparation is realized, and a stable solution product is obtained.

This invention discloses a low-temperature water-washing antioxidant solder paste, its soldering method, and its water washing method. The solder paste comprises the following components by mass percentage: 89±0.5% Sn42Bi58 solder paste and 11±0.5% flux. The flux comprises, by mass percentage: 2-8% antioxidant, 2-6% stabilizer, 45-55% surfactant, 15-30% solvent, and 10-15% activator. The antioxidant is one or more of benzotriazole, di-tert-butyl-p-cresol, and antioxidant 245. This invention improves the antioxidant performance of the Sn42Bi58 solder paste and reduces oxidation loss during water washing by adjusting the component ratio and adding antioxidants and stabilizers. This solves the problems of antioxidant properties in low-temperature solder paste water washing systems, corrosion of copper by solder paste residue, and soldering ability and operation performance not meeting normal repetitive operation cycles.

The present application relates to the technical field of separation and purification, in particular to a method for recovering 2,4,6-trimethylphenol from 2,6-dimethylphenol residue, comprising: cooling the 2,6-dimethylphenol residue to 15±1 DEG C, and keeping the temperature for 10-40 min, then blowing out the liquid material by compressed gas; heating and melting the crystallized solid material, keeping the temperature for 0-40 min, then cooling to 30±1 DEG C, keeping the temperature for 10-40 min, then blowing out the liquid material by compressed gas; heating and melting the crystallized solid material, keeping the temperature for 0-40 min, then cooling to 40-45 DEG C, keeping the temperature for 10-40 min, then blowing out the liquid material by compressed gas; heating and melting the crystallized solid material, and discharging to obtain 2,4,6-trimethylphenol. The present application significantly improves the recovery rate and purity of 2,4,6-trimethylphenol by multiple melting and crystallization in stages and blowing out the liquid material by compressed gas.

This invention relates to a catalyst for preparing ortho-methylated products of phenol. The catalyst is a composite oxide containing indium oxide, with the composition In₂O₃ / X, where X is a promoter. The promoter is selected from one or more of ZrO₂, HfO₂, ZnO, Cr₂O₃, CeO₂, and MgO, and the amount of the promoter metal is 0.01 to 100 times the molar amount of indium. This invention also discloses the application of this catalyst in the reaction of carbon dioxide hydrogenation coupled with phenol methylation to prepare o-cresol and 2,6-dimethylphenol. Compared with traditional catalytic methods, the catalyst of this invention has low energy consumption, long service life, and can highly selectively convert phenol to o-cresol and 2,6-dimethylphenol with almost no byproduct formation.