15 results about "Xylenol" patented technology

The invention relates to a method for producing 2, 5-xylenol by isomerization of 2, 6-xylenol, which comprises the following steps: preheating the 2, 6-xylenol, mixing the preheated 2, 6-xylenol with diluent gas, continuously passing through an isomerization catalyst bed, and carrying out gas-phase reaction under the reaction conditions that the reaction temperature is 250-350 DEG C and the feed weight space velocity is 0.5-20h <-1 > to generate the 2, 5-xylenol. The isomerization catalyst is prepared by taking MCM-22, ZSM-5, MCM-41 and MCM-49 molecular sieves as active components and modifying the active components. 2, 6-xylenol is used as a raw material, the selectivity of 2, 5-xylenol can reach 90%, and the catalyst is good in stability. The catalyst is free of equipment corrosion in the production process, is an environment-friendly catalyst, and has a good industrial application prospect.

The invention discloses a phenol separation coupling catalysis purification method, and relates to the technical field of fine chemical separation and purification. According to the method, a metal oxide modified H-ZSM-5 molecular sieve is used as a catalyst, a coupling reaction and a separation process are carried out in a catalytic rectifying tower, and two core processes are synchronously completed: 1, impurities such as phenol and o-cresol in raw materials are subjected to a targeted O-alkylation reaction with methanol, and the impurities difficult to separate are efficiently converted into an alkylate easy to rectify; and 2, precise fractionation is synchronously realized, heavy ether products are extracted and removed from a side line, and target products mainly comprising high-purity 2, 6-xylenol and 2, 4-xylenol are obtained in a tower kettle. Through integrated design of targeted conversion and synchronous separation, key impurities are removed with high selectivity, the process is simplified, equipment investment and energy consumption are reduced, non-target side reactions are avoided, and high selectivity, high yield, process economy and product quality of target xylenol are considered.

The application discloses a preparation method of methyl xylene phenol blue free acid, which comprises the following steps: (1) adding 2-sulfobenzoic acid cyclanth and 2, 5-dimethyl phenol into a pressure-resistant reaction container, and performing a methylation reaction under the catalysis of a proton acid, wherein the reaction temperature is 100-120 DEG C, the reaction time is 10-20 h, water is added after the reaction is completed, heating is performed to 50-70 DEG C, and the temperature is kept for 1-3 h, and then hot filtration is performed to obtain dimethyl phenol blue; (2) in a reaction container, sodium iminodiacetic acid dihydrate is heated to 40-60 DEG C under the condition of glacial acetic acid, and then cooled to room temperature and stirred, and then dimethyl phenol blue and formaldehyde solution are added, and then stirring is performed at room temperature for 1-3 h, and then heating is performed to 40-60 DEG C to react for 6-10 h, and then hot filtration is performed, and then the reaction solution is added into the first reaction solution, and then crystallization is performed, and then filtration is performed to obtain methyl xylene phenol blue free acid. The application has the advantages of simple operation, convenient source, high product purity and good application prospect.

The invention belongs to the field of organic synthesis, and particularly relates to a catalyst, a preparation method thereof and application of the catalyst in preparation of 2, 6-xylenol. The molar ratio of the iron element to the vanadium element to the platinum element in the catalyst is 100: (2-15): (0.05-0.5), and the preparation method of the catalyst is convenient and beneficial to industrial production. The catalyst provided by the invention has the characteristics of high conversion rate, high 2, 6-xylenol selectivity and high stability in a reaction for preparing 2, 6-xylenol and co-producing o-cresol through phenol methylation, the phenol conversion rate can reach 95% or above, and the 2, 6-xylenol selectivity can reach 90% or above.

Provided are antimicrobial compositions containing a potentiated halogen substituted xylenol, especially para-chloro-meta-xylenol (PMCX). In particular, a quaternary ammonium compound was found to dramatically improve the efficacy of the halogen containing xylenol against various microorganisms.

This invention discloses a flotation separation method for collecting galena and inhibiting sphalerite and pyrite, achieving efficient separation of galena from sphalerite and pyrite in a low-alkaline pulp environment, belonging to the field of mineral beneficiation technology. This invention uses N-hydroxyethylethylenediaminetriacetic acid as an inhibitor of sphalerite and pyrite at a low alkalinity of pH 7.5-9.5, and one or two of sodium diethyldithiocarbamate, sodium ethyl xanthate, and xylenol dithiophosphate as collectors for galena. Under low dosage conditions, it achieves simultaneous inhibition of sphalerite and pyrite and effective collection of galena, offering advantages of high efficiency, simple process, economy, and environmental friendliness. It is particularly suitable for silver-bearing, high-sulfur, low-grade lead-zinc ores and has broad application prospects.

The invention relates to the technical field of chromatographic detection, in particular to a detection method of parachlorometaxylenol. The detection method of parachlorometaxylenol comprises the following steps: (1) preparing a sample solution: dissolving a sample to be detected in chromatographic-grade acetonitrile, and filtering by using a microfiltration membrane to obtain the sample solution; and (2) analyzing the sample solution obtained in the step (1) by using high performance liquid chromatography. Through improvement of a specific solvent and chromatographic conditions, accurate and efficient determination of parachlorometaxylenol in a reaction product is realized.

This invention belongs to the technical field of organic synthesis and separation, specifically relating to a method for synthesizing phenolic resin from 2,4-xylenol / 2,5-xylenol. The method provided by this invention utilizes the difference in reactivity between 2,5-xylenol, 2,4-xylenol, and aldehydes, using a portion of the inexpensive 2,4 / 2,5-xylenol to replace phenol in the production of phenolic resin. Simultaneously, it produces 99% 2,4-xylenol and p-cresol, etc. Since the prices of 2,4-xylenol and p-cresol are significantly higher than those of 2,4 / 2,5-xylenol, this method also offers good economic benefits and expands the application scope and market size of 2,4 / 2,5-xylenol.

The invention provides a method for synthesizing anisole products by using cresol fractions, which comprises the following steps: taking cheap cresol fractions as raw materials, and carrying out etherification reaction on the cresol fractions and an alkylating agent under the action of a basic catalyst to obtain a mixture of various methyl anisole and dimethyl anisole which are insoluble in water; and then various anisole products are obtained through a series of treatment means such as rectification treatment, tert-butylation separation and isobutene removal. According to the method, cresol with low price is adopted to replace pure phenol such as refined o-cresol, pure 2, 6-xylenol, m-cresol, p-cresol, 2, 4-xylenol, 2, 5-xylenol and the like to produce corresponding alkyl etherates, so that the economic benefit is very considerable; and the method is simple and easy to implement, the operability of the process is good, the usability is high, and the method is convenient to popularize and apply in industrial production.

Applicants have developed novel methods and compositions for treating, preventing or ameliorating the effects plant phytopathogen infestation in plants, including of Candidatus Liberibacter spp. the causal agents of citrus greening and potato zebrachip disease. Novel compositions include one or more active agents of aminocaproic acid, carbinoxamine maleate, chloroxylenol, chlorpropamide, cinoxacin, duartin, and cyclopentolate hydrochloride as well as their derivatives, or salt / acid forms thereof. Methods of preventing disease development and infestation by plant pathogens are disclosed as well as methods of making, using and producing such compositions.

The invention belongs to the field of synthesis and separation of coalification products, and particularly relates to a method for separating various phenols from mixed cresol. According to the method, the mixed cresol is used as a raw material, ethyl in o-ethyl phenol in the m-cresol / o-ethyl phenol mixture is removed through the dealkylation catalyst to generate phenol and ethylene, and due to the fact that the ethyl removal reaction is carried out in the presence of the specific catalyst at a low temperature, few methyl in phenolic substances can be subjected to removal and transposition reactions; the method comprises the following steps: firstly, decomposing ethylene, then quantitatively reacting the ethylene obtained by decomposition with o-cresol in a 2, 6-xylenol crude product under the catalysis of a cresol aluminum catalyst to generate 2-ethyl-6-cresol, and rarely reacting with 2, 6-xylenol to generate 4-ethyl-2, 6-xylenol, thereby achieving the purpose of purifying 2, 6-xylenol. The lysate and the alkylation reaction liquid are respectively rectified to obtain high-quality phenol, m-p-cresol, 2, 6-xylenol and 2-ethyl-6-cresol, and the method is simple and easy to operate, few in three wastes and low in production cost.

The invention belongs to the technical field of fabric color fixing agents, and particularly relates to an acidic color fixing agent free of phenol and bisphenol substances as well as a preparation method and application of the acidic color fixing agent. The acidic color fixing agent is characterized by comprising the following components in parts by weight: 25-55 parts of water, 10-35 parts of tannic acid, 1-20 parts of cardanol sulfonic acid, 1-15 parts of aralkyl phenol, 1-5 parts of xylenol, 1-5 parts of formaldehyde, 1-10 parts of bio-based aldehyde, 1-10 parts of acrolein, 1-10 parts of concentrated sulfuric acid, 1-5 parts of acetic acid, 1-10 parts of sodium hydroxide and 1-5 parts of ammonia water. The invention also provides a preparation method of the acidic color fixing agent. The acid color fixing agent has the advantages of high fastness, no color change and small anion and cation conflict risk, can ensure that bisphenol A, B, S, F and AF and phenol are not used, and can meet the requirements of environmental regulations.

The invention belongs to the technical field of lubricating compositions, and particularly relates to an anti-wear composition, a preparation method and lubricating oil containing the anti-wear composition. The anti-wear composition is prepared from the following components in percentage by mass: sulfo-fatty acid ester, polyalkyl phosphate, polyether polyester, carboxylated graphene-molybdenum oxide composite nanoparticles, aziridine modified oleylamine, sulfo-xylenol formaldehyde resin, a metal alkoxide complex, a nonionic surfactant and solvent oil which is supplemented to 100%. According to the invention, multiple organic synergistic additives and inorganic nanoparticles are compounded to construct a stable lubricating film layer, and an anti-wear system with a uniform structure is realized through multi-stage dispersion, compounding and degassing treatment. The composition shows excellent wear resistance, thermal stability and corrosion inhibition capability under high-temperature and high-load friction conditions, the comprehensive performance of a lubricating oil product is superior to that of an existing formula, and the lubricating oil product has the characteristics of greenness, low carbon and environmental protection, and is suitable for industrial lubrication requirements under complex working conditions.

The invention belongs to the field of synthesis and separation of coalification products, and particularly relates to a method for obtaining dephenolized carbolic oil and phenolic substances by utilizing xylenol carbolic oil fraction separation. According to the method disclosed by the invention, phenolic substances in the cheap 2, 4-xylenol / 2, 5-xylenol phenol oil fraction raw material and methanol are subjected to fixed bed catalytic methylation reaction, and the methylated reaction liquid is rectified to obtain 2, 4-xylenol / 2, 5-xylenol dephenolized phenol oil, 2, 4, 6-xylenol and 2, 3, 6-tricresol, so that the application field of the 2, 4-xylenol / 2, 5-xylenol phenol oil fraction is expanded, and the method is suitable for industrial production. The treatment difficulty of the phenol-containing coal tar is reduced, and the separation of the 2, 4-xylenol / 2, 5-xylenol carbolic oil fraction is realized.

The invention discloses an electrochemical preparation method of parachlorometaxylenol, and relates to the technical field of medicine synthesis. The electrochemical preparation method comprises the following steps: adding an electrolyte and a solvent into an electrolytic tank, adding 3, 5-xylenol, and carrying out an electrolytic reaction to obtain parachlorometaxylenol. The method only needs to apply continuous and controllable voltage and current to the system to catalyze the reaction, does not need to additionally add a catalyst, avoids the use of reagents with potential safety hazards, directly generates chlorine through electrolysis and then carries out the reaction, and has the advantages of environmental friendliness, simple process, mild reaction conditions, reproducible reaction energy and the like.