31 results about "Phenol product" patented technology

The invention discloses a crude phenol continuous refining device and method, the device comprises a crude phenol storage tank, a dehydrating tower, a primary tower, a phenol fraction tower, an o-cresol fraction tower, a m-cresol and p-cresol tower, an extractive distillation tower and a p-cresol fraction tower which are connected in sequence, and the top of each tower is independently connected with a cooler; the method specifically comprises the following steps: (1) discharging phenol water; (2) discharging a heavy fraction; (3) discharging phenol; (4) discharging o-cresol; (5) discharging residual oil at the bottom of the tower; (6) carrying out extractive distillation, and discharging m-cresol; and (7) discharging p-cresol, and recycling the extraction agent. Compared with a traditional continuous rectification process, the method has the advantages that all components are separated by adopting vacuum rectification, the separation degree of the obtained product is higher, the number of theoretical plates and energy consumption are lower, high-purity phenol products are produced with low energy consumption, low cost and high efficiency, and economic benefits and environmental benefits are greatly improved.

The utility model discloses a coal chemical phenolic wastewater extraction and solvent recovery system. The system comprises an extraction tower, a water tower, an oil-water separator, an extract separation tower, a water washing tower, an extract tank, a solvent circulating tank, a light oil tank and a crude phenol tank. By adding the water washing tower for washing, the content of phenol and homologues in crude phenol can be increased, and the content of neutral oil can be reduced, so that the crude phenol product meets the standard requirement; meanwhile, the quality of the recovered extraction solvent can be improved after water washing by the water washing tower, and impurities such as light oil in the extraction solvent can be removed in time, so that the extraction treatment effect of the wastewater can be improved, and the treatment load of a biochemical device can be reduced.

The present disclosure relates to a production process and device for synthesizing bisphenol A by a resin method, including a condensation reaction unit for performing a catalytic condensation reaction between phenol and acetone to generate bisphenol A, a first-stage adduct crystallization unit for mixing a concentrated solution with adduct crystals recycled after melting and then performing adduct crystallization, a liquid-phase dephenolization unit for melting an adduct to yield a bisphenol A product, a secondary adduct crystallization unit for recycling phenol and bisphenol A from a mother solution, a solvent recycling unit for recycling unreacted phenol and unreacted acetone, and discharging phenol-containing process water for sewage treatment, and a cracking and rearrangement unit for recycling the phenol from the mother solution, and convert bisphenol A, 2,4-bisphenol A and the like therein in the mother solution into the bisphenol A.

The invention provides a method for separating phenol substances from phenol-containing coal tar, which comprises the following steps: rectifying the phenol-containing coal tar to obtain various phenol oil mixtures containing different phenol distributions, and separating various phenol products from various dephenolized phenol oils in different distillation ranges by adopting a proper separation means to obtain the phenol substances. And high-quality phenol products with different high purities are obtained. The method disclosed by the invention can be used for separating and utilizing phenol products and oil products to the greatest extent, and has good industrial application value and economic value.

According to the impurity removal method for the mixed phenol extracted from the coal tar, a series of impurity removal treatment and refining purification treatment are conducted on the mixed phenol raw material, various high-purity phenol products are finally obtained, the method is low in raw material requirement, the impurity removal process is environmentally friendly, the impurity removal effect is good, and the method is suitable for industrial production. The method is especially suitable for impurity removal of crude phenol extracted from phenol-containing coal tar, phenol-containing phenol oil and phenol-containing coal direct liquefaction oil by adopting a solvent extraction method.

The application relates to the technical field of tail gas treatment, and discloses a tail gas treatment device after furan phenol product rectification, which comprises a frame mechanism, an embedded mechanism, a replacement mechanism and a monitoring mechanism, the inner side of the frame mechanism is fixedly connected with the side surface of the embedded mechanism, the inner side of the embedded mechanism is engaged with the side surface of the replacement mechanism, the embedded mechanism comprises an embedded frame and a cleaning rod, the inner side of the embedded frame is provided with a mounting groove, the inner side of the mounting groove is fixedly connected with a tooth ring, organic matters in tail gas are removed through the combined action of the first placement frame and the second placement frame, the reliability of the tail gas treatment device is improved, and the risk of system shutdown caused by faults in a link is reduced; the fixed tooth is moved on the tooth ring through a moving rod, the activated carbon on the inner side is replaced, the tail gas treatment device can continuously maintain high adsorption efficiency in the operation process, and therefore the pollutant concentration in the tail gas is effectively reduced.

The invention discloses a preparation method and application of a high-temperature-resistant strong-acid cation exchange resin catalyst, and the cation exchange resin catalyst is obtained by the preparation method and is used as a catalyst for a dealkylation reaction of alkylphenol. The catalytic reaction of alkylphenol dealkylation specifically comprises the following steps: in a reaction kettle provided with a rectifying column, taking alkylphenol as a raw material, and reacting with a high-temperature-resistant strong-acid cation exchange resin catalyst at a certain temperature to generate a phenol product. The dealkylation reaction is carried out by adopting the high-temperature-resistant strong-acid cation exchange resin catalyst to generate a corresponding phenol product and isobutene, the activity can be maintained at a relatively high reaction temperature, the relatively high reaction temperature requirement of the dealkylation reaction of alkylphenol can be met, the yield of the dealkylation reaction is greater than 90%, carbon deposition and inactivation are not easy to occur, and the dealkylation reaction is stable. The method is easy to separate from a reaction system, dealkylation conditions are milder than those of inorganic solid acid, continuity is facilitated, and a technical scheme is provided for heterogeneous catalytic dealkylation industrialization.

The invention discloses a coal chemical phenolic wastewater extraction and solvent recovery process which comprises the following steps: extracting and separating phenolic wastewater through an extraction tower, separating light oil, heavy aromatics and crude phenol from an extract through an extract separation tower, refluxing one part of the light oil to the extract separation tower, and washing the other part of the light oil through a water washing tower to obtain a light oil product; one part of the crude phenol flows back to the extract separation tower, and the other part is directly used as a crude phenol product; extracting the raffinate wastewater through a water tower and separating the raffinate wastewater through an oil-water separator, recovering an extracting solvent, and conveying the treated wastewater to a biochemical device for further treatment or direct reuse. According to the process, the content of phenols and homologues in the crude phenol can be increased, the content of neutral oil can be reduced, and the crude phenol product meets the standard requirement; meanwhile, by utilizing the process, impurities such as light oil in the extraction solvent can be removed in time, so that the quality of the recovered extraction solvent is improved, the extraction treatment effect of wastewater can be improved, and the treatment load of a biochemical device is reduced.

The invention provides a method for preparing 2, 6-dichloro-4-nitrophenol or 2, 4-dichloro-6-nitrophenol with zero discharge of wastewater, and the method comprises the following steps: dropwise adding an organic solvent solution of 2, 6-dichlorophenol or 2, 4-dichlorophenol into a nitric acid solution, and carrying out heat preservation reaction to obtain a 2, 6-dichlorophenol nitride or a 2, 4-dichlorophenol nitride reaction solution; cooling, carrying out solid-liquid separation on the reaction liquid obtained in the nitration reaction step, washing with water, and drying to obtain a 2, 6-dichloro-4-nitrophenol or 2, 4-dichloro-6-nitrophenol product; the organic layer sleeve obtained through solid-liquid separation is used for preparing a 2, 6-dichlorophenol or 2, 4-dichlorophenol solution, and the water layer sleeve is used for preparing a nitric acid solution; neutralizing water washing liquid with alkali, and performing reduced pressure distillation and recycling for water washing. According to the application, not only is efficient preparation of 2, 6-dichloro-4-nitrophenol or 2, 4-dichloro-6-nitrophenol realized, but also resources are comprehensively utilized, and no wastewater is discharged.

The invention discloses a process for preparing phenol products from 2, 4-xylenol / 2, 5-xylenol, which comprises the following steps: adding a 2, 4-xylenol / 2, 5-xylenol mixture into a reactor added with silicon-aluminum-chromium oxide and an acidic catalyst, carrying out dealkylation reaction at 280-400 DEG C, removing propylene, ethylene and the like from o-isopropyl phenol, 2-methyl-6-ethyl phenol and the like in the reaction, and then carrying out dealkylation reaction to obtain the phenol products. The mixed phenol and olefin mixture contains phenol, cresol and 2, 4-xylenol / 2, 5-xylenol; the mixture is rapidly cooled and liquefied, olefin is discharged, rectification is carried out, and high-purity 2, 5-xylenol / 2, 4-xylenol without o-isopropyl phenol, 2-ethyl-6-cresol and the like is obtained; the preparation method comprises the following steps: reacting propylene with m-cresol by controlling the reaction temperature to obtain thymol, 4-isopropyl-3-cresol and the like, and reacting ethylene with phenol to obtain o-ethyl phenol and p-ethyl phenol; according to the method, ethyl in 2-ethyl-6-cresol and isopropyl / propyl in o-isopropyl phenol in alkylphenol are removed at high temperature, a purified 2, 5 / 2, 4-xylenol product is obtained, and a high-purity product is produced.

The application provides a multi-level hole catalyst for benzene oxidation to prepare phenol and a preparation method and use thereof, and the preparation method comprises the following steps: (1) a catalyst raw material containing a pore modifier is subjected to a hydrothermal synthesis reaction, and a precursor obtained is subjected to a first calcination to obtain a first molecular sieve containing micropores and mesopores; (2) the first molecular sieve is sequentially subjected to an alkaline modification treatment and a second calcination to obtain the multi-level hole catalyst for benzene oxidation to prepare phenol. The application has a typical multi-level hole structure under the premise of ensuring sufficient acidity, the maximum pore diameter of the molecular sieve is increased from 10 nm to 100 nm, the desorption efficiency of the phenol product on the catalyst can be increased, the anti-coking performance of the catalyst is significantly improved, the service life of the catalyst is prolonged, and the catalyst can be well applied in the reaction of preparing phenol by oxidizing benzene with nitrous oxide.

The invention relates to the technical field of chemical production, and discloses a process for synthesizing fluorinated phenol by a microchannel continuous flow one-step method, which comprises the following steps: S1, distilling phenol; s2, mixing fluorine and nitrogen mixed gas; s3, pressurizing and mixing; and S4, rectification separation. According to the process for synthesizing the fluorinated phenol by the micro-channel continuous flow one-step method, the distillation container, the mixing container and the rectification container are connected in series through the glass pipelines, so that the preparation process of the fluorinated phenol is simpler, meanwhile, liquid phenol is atomized by adopting a Venturi structure in the fluorine-nitrogen mixed gas blowing process, and the liquid phenol is further atomized by adopting the Venturi structure. And then the Venturi principle is utilized to promote the atomized phenol and the fluorine-nitrogen mixed gas to be quickly and efficiently mixed in the small pipe, so that the production efficiency of the fluorinated phenol is improved, the generation of impurities is reduced, and the purity of the subsequent fluorinated phenol product is further improved. The influence of low-temperature crystallization on the reaction effect of the fluorinated phenol is avoided.

The present application provides a method for extracting a phenol compound and a pyridine compound from naphthalene oil stepwise by using a deep eutectic solvent (DES). The method comprises: step 1, mixing a naphthalene oil with an alkane and a DES and performing liquid separation on the mixture to obtain a deep eutectic extraction phase and a solvent raffinate phase; step 2, mixing the deep eutectic extraction phase with a first back-extraction agent and filtering the mixture to obtain a first back-extraction phase and a recyclable DES; step 3, distilling the first back-extraction phase to obtain a heteroatom mixture, mixing the heteroatom mixture with a hydrogen-acceptor-type deep eutectic extraction agent and an alkane, and performing liquid separation on the mixture to obtain a deep eutectic phenol compound extraction phase and a pyridine compound and alkane raffinate phase; and step 4, mixing the phenol compound extraction phase with a second back-extraction agent and filtering the mixture to obtain a phenol-containing second back-extraction solution and a hydrogen-acceptor-type extraction agent. A phenol product is recovered from a second back-extraction agent solution by distillation. The DES is tetraethylammonium chloride, tetrabutylammonium chloride, tetrabutylammonium bromide or tetrabutylphosphonium bromide, and glycolic acid, oxalic acid, citric acid, or p-toluenesulfonic acid.

The invention discloses a method for separating phenolic substances in coal tar by constructing a deep eutectic solvent based on betaine and organic acid, and belongs to the technical field of deep processing of coal tar. The halogen-free eutectic solvent is synthesized by taking betaine as a hydrogen bond acceptor and organic acid as a hydrogen bond donor. Mixing the eutectic solvent with phenol-containing oil, heating, stirring, cooling and standing to divide a system into a dephenolized oil phase (upper phase) and a phenol-containing eutectic solvent phase (lower phase); and then, a proper back-extraction agent is adopted to perform back extraction on the phenol-containing eutectic solvent phase, after back extraction, rotary evaporation is performed to respectively obtain a phenol product, a regenerated back-extraction agent and a regenerated eutectic solvent, and the regenerated back-extraction agent and the regenerated eutectic solvent can be recycled. According to the method, efficient separation is achieved through hydrogen-bond interaction between the eutectic solvent and the phenolic substances, use of strong acid and strong alkali and generation of phenolic wastewater in a traditional chemical extraction method are avoided, equipment corrosion is prevented through the halogen-free characteristic, the phenol resource recycling rate is increased, and the coal tar quality is improved.

The invention discloses a process for recovering phenol in phenol-containing wastewater, and relates to the technical field of chemical production. The process for recovering phenol in phenol-containing wastewater comprises the following steps: mixing phenol-containing wastewater and an extraction agent, and extracting to obtain phenol-containing extract liquor; separating phenol in the extract liquor by adopting a rectifying tower, extracting an extracting agent from the top of the tower, gasifying a material at the lower part of the tower by a reboiler, and feeding into the rectifying tower again; a gas-phase material at the lower part of the rectifying tower is extracted from a side line and enters a phenol recovery tower; and condensing the tower top material of the phenol recovery tower, partially refluxing, and partially extracting as a phenol product. The phenol recovery tower is arranged, so that phenol is separated from colored materials such as low-molecular resin and phenol oxide, and a phenol product with relatively high purity is obtained.

The present application relates to a kind of by phenol alkylation reaction preparation alkyl phenol method.The method uses anatase titanium dioxide as catalyst, phenol as reaction substrate, alcohol as alkylating agent, under nitrogen atmosphere, phenol alkylated product is obtained in one-step process.The reaction process is as follows:phenol, alcohol and solvent are mixed with catalyst, then put into pressure vessel, seal, and fill in protective gas, reaction temperature is higher than 280 DEG C, reaction time is longer than 4 hours, phenol is reacted into ortho α-C alkylated product.The method has simple reaction process, can be synthesized with high selectivity ortho straight-chain alkyl phenol product, catalyst is stable, easy to separate from reaction system and can be repeatedly used, with good industrial application prospect.

The method comprises the following steps: adding the activated curing agent into wastewater, controlling the temperature of the wastewater to be 45-60 DEG C, controlling the pH value of the wastewater to be 9-11, and then filtering to remove a solid phase so as to obtain a pretreatment solution; rectifying and separating the pretreatment liquid to obtain an ammonia water product and crude phenol water; adjusting the pH value of the crude phenol water to 4.5-6.5 by using inorganic acid, then removing insoluble substances separated out from the crude phenol water, and rectifying to remove hydrogen sulfide in the crude phenol water to obtain purified phenol water; extracting and purifying the phenol water by using an organic extracting agent to obtain purified water and a loaded organic phase; and recovering phenol from the loaded organic phase to obtain a phenol product, and returning the obtained regenerated extractant to purified phenol water for recycling. According to the scheme, the problems of coking and blocking in the conventional phenol-ammonia wastewater treatment process can be effectively solved, the energy consumption and medicament consumption in the deamination process are reduced, the formation of a third phase in the phenol extraction process is reduced, the purity of an ammonia water product and a phenol product is improved, and the pollutant removal rate of purified wastewater is improved.

The application provides a method for step-by-step extraction of phenolic and pyridine compounds in naphthalene oil by using a eutectic solvent, comprising the following steps: step 1, mixing naphthalene oil with an alkane and a eutectic solvent, and separating to obtain a eutectic extraction phase and a solvent raffinate phase; step 2, mixing the eutectic extraction phase with a first stripping agent, and filtering to obtain a first stripping phase and a recyclable DES; step 3, distilling the first stripping phase to obtain a heteroatom mixture; mixing the heteroatom mixture with a hydrogen acceptor type eutectic extraction agent and an alkane, and separating to obtain a eutectic phenolic compound extraction phase and a pyridine compound alkane raffinate phase; step 4, mixing the phenolic compound extraction phase with a second stripping agent, and filtering to obtain a second stripping solution of phenol and a hydrogen acceptor type extraction agent; and distilling to recover the phenol product in the second stripping agent solution. The eutectic solvent is tetraethylammonium chloride, tetrabutylammonium chloride, tetrabutylammonium bromide or tetrabutylphosphonium bromide, and the eutectic solvent is combined with glycolic acid, oxalic acid, citric acid or p-toluenesulfonic acid.

The invention relates to the technical field of organic synthesis and chemical separation, in particular to a method for synthesizing phenolic resin and by-producing ortho-alkylphenol and para-alkylphenol, which is characterized in that high-activity meta-phenol and most phenol are systematically and preferentially reacted with formaldehyde by controlling the feeding sequence and reaction depth of reactants according to the difference of reaction rates of different phenols and formaldehyde; according to the method, a phenolic resin product is subjected to dehydration to generate a phenolic resin polymer, most of low-activity ortho-alkylphenol and para-alkylphenol are retained in unreacted substances due to slow reaction, the unreacted phenols and water are evaporated in the dehydration process, primary separation from the resin product is realized, and a small amount of formaldehyde and incompletely reacted meta-phenol still exist in the evaporated water phase; according to the method, the ortho-phenol and para-phenol are subjected to a further reaction to generate a water-soluble oligomer, so that meta-phenol impurities are effectively prevented from being mixed into a subsequent oil phase, high purity of ortho-phenol and para-phenol products is ensured, and finally separation from water and the water-soluble impurities is completed through solvent extraction.

This invention discloses a system and method for recovering organic matter from the concentrated coal gas water of a fixed-bed gasifier. The recovery system is structured as follows: a fixed-bed gasifier, a coal gas water heat exchanger, a scrubbing tower, and a heater are connected in sequence. The coal gas water outlet at the top of the heater is connected to the top of a humidification tower. The circulating water outlet at the bottom of the humidification tower is connected to the coal gas water inlet via a coal gas water circulation pipeline. The top of the humidification tower is connected to the bottom of the fixed-bed gasifier. The concentrated water inlet of a centrifugal extractor is connected to the coal gas water circulation pipeline, the solvent inlet is connected to a solvent tank, and the solvent phase outlet is connected to a fractionation tower. The top of the fractionation tower is connected to the solvent tank, and the bottom is connected to a crude phase intermediate product tank. Through this recovery system, the coal gas water produced during the coal gasification process is completely evaporated into water vapor to supply the gasifying agent in the gasifier. Most of the organic matter in the coal gas water is absorbed and separated by the solvent to obtain crude phenol products. The gasification workshop does not discharge coal gas water externally, and it is recovered and utilized as a resource.

The invention relates to the technical field of tail gas treatment, and discloses a tail gas treatment device after rectification of a furan phenol product, the tail gas treatment device comprises an outer frame mechanism, and further comprises a built-in mechanism, a replacement mechanism and a monitoring mechanism, the inner side of the outer frame mechanism is fixedly connected with the side surface of the built-in mechanism, the inner side of the built-in mechanism is engaged with the side surface of the replacement mechanism, and the monitoring mechanism is arranged on the outer frame mechanism. The built-in mechanism comprises a built-in frame and a cleaning rod, a placement groove is formed in the inner side of the built-in frame, a gear ring is fixedly connected to the inner side of the placement groove, organic matter in tail gas is removed through the combined action of a first placement frame and a second placement frame, and the reliability of the tail gas treatment device is improved; the risk of shutdown of the whole system caused by faults of a certain link is reduced; fixed teeth are moved on a tooth ring through a movable rod, activated carbon on the inner side is replaced, it is guaranteed that the tail gas treatment device can continuously keep high adsorption efficiency in the operation process, and therefore the concentration of pollutants in tail gas is effectively reduced.

The utility model discloses a recovery system for phenol in phenol-containing extract liquor, and relates to the technical field of chemical production equipment. The system comprises an extraction agent rectifying tower and a phenol recovery tower, the middle part of the extraction agent rectifying tower is provided with an extraction liquid feeding hole, and the lower part of the extraction agent rectifying tower is provided with a gas-phase material side line extraction hole; a phenol recovery tower is used as a side line tower of the extraction agent rectifying tower, a phenol feeding hole is formed in the lower part of the phenol recovery tower, the phenol feeding hole is connected with the gas-phase material side line extraction hole through a pipeline, and a phenol product extraction hole is formed in the top of the phenol recovery tower. Through the arrangement of the phenol recovery tower, phenol is separated from low-molecular resin and phenol oxide, and a high-concentration phenol product is obtained.

The invention discloses a method for separating phenol / o-cresol phenol oil fractions to obtain dephenolized phenol oil, which comprises the following steps: decompressing phenol-containing coal tar to remove water, fractionating to obtain phenol-containing phenol oil, and decompressing and rectifying to obtain the phenol / o-cresol phenol oil fractions; mixing the phenol / o-cresol phenol oil fraction, methanol and water, introducing hydrogen, reacting under catalysis, removing methanol, and standing and layering the remaining material to obtain a water layer and a phenol-containing material layer; extracting the water layer to obtain an extracted organic phase and a water phase; and combining the phenol-containing material layer with the extracted organic phase, and performing vacuum rectification to obtain phenol / o-cresol dephenolized phenol oil and at least one of 2, 6-xylenol, 2, 4 / 2, 5-xylenol, 2, 4, 6-tricresol, 2, 3, 6-tricresol and 2, 3, 5-tricresol. The dephenolized phenol oil is produced from the phenol / o-cresol phenol oil fraction which is difficult to rectify and separate, one or more phenol products are co-produced, the production cost is low, and the economic value is high.

This invention provides a method for preparing 2,4,6-tris[(3-dimethylaminopropyl)aminomethyl]phenol, comprising mixing phenol, N,N-dimethylaminopropylamine, a catalyst, and a solvent to obtain a mixture; adding an aqueous formaldehyde solution dropwise to the mixture; heating and maintaining the temperature until the reaction is complete after the addition is finished; purifying the reactants by acid-base extraction to obtain the 2,4,6-tris[(3-dimethylaminopropyl)aminomethyl]phenol product; wherein the catalyst is a Brønsted acid or a Lewis acid. This invention, by introducing a Brønsted acid or a Lewis acid as a catalyst, effectively reduces the activation energy of the Mannich reaction, inhibits side reactions such as hydroxymethylation, and improves the yield and purity of the target product; combined with the acid-base extraction purification process, the product yield can reach over 90%, the purity exceeds 97%, and the product has a light color and excellent appearance. The reaction conditions of this invention are mild and controllable, the reaction time is shortened, and the amount of waste emissions is low, making it suitable for large-scale industrial production.

The application discloses a method for synthesizing chlorinated phenol by catalytic chlorination, which comprises the following steps: reacting phenol with mixed gas of chlorine and air in water in the presence of a catalyst to obtain a chlorination reaction liquid, and then performing liquid separation and distillation dehydration on the chlorination reaction liquid to obtain a chlorinated phenol product. The method uses phenol as a raw material, and the reaction of the phenol with the mixed gas of chlorine and air in the presence of the catalyst can obviously improve the reaction rate while obtaining a higher reaction selectivity. After the improvement, pure oxygen and concentrated hydrochloric acid are no longer used, and a large amount of phenol-containing hydrochloric acid by-product is no longer generated, and the product quality and the product yield are greatly improved, and the method is more suitable for industrial large-scale production.

The present disclosure provides a method for preparing a sulfurized alkyl phenate product to achieve a high sulfurization ratio of sulfurized alkyl phenate to unsulfurized alkyl phenate / phenol in the context of a neutralized and optionally overbased additive.

The application provides a method for separating cyclohexanol and phenol by extractive rectification, relates to the field of chemical separation technology, and selects alcohol solvents such as ethylene glycol as extractants for extractive rectification, changes the relative volatility among components, effectively overcomes the defect that the conventional rectification technology is difficult to separate due to the highest azeotropic point of cyclohexanol and phenol, and can obtain cyclohexanol and phenol products with high purity and high yield. The purity of the cyclohexanol product is greater than or equal to 99.5 wt%, the purity of the phenol product is greater than or equal to 99.95 wt%, and the product yield is greater than or equal to 98%. The separation process is simple and efficient, the solvent can be recycled, and the method has good economic benefits and application prospect.

The invention belongs to the technical field of organic synthesis and separation, and particularly relates to a method for preparing phenolic products from m-p-isopropyl phenol / m-p-propyl phenol. The invention provides a method for preparing a phenolic product from m-p-isopropyl phenol / m-p-propyl phenol. The method comprises the following steps: (1) adding silicon-aluminum oxide and zirconium phosphate into a mixture of m-p-isopropyl phenol / m-p-propyl phenol to carry out dealkylation reaction; (2) after the dealkylation reaction is finished, carrying out first cooling treatment, then adding a sulfuric acid solution and a mixture of phenol and m-cresol for reaction, after the reaction is finished, carrying out second cooling treatment, discharging gas, replacing reaction liquid with nitrogen, and then carrying out filtering treatment to obtain reaction product mixed liquid, the reaction product mixed solution is prepared from methanol, phenol, m-cresol, o-isopropyl phenol, p-isopropyl phenol, m-isopropyl phenol, 2-isopropyl-5-cresol and 4-isopropyl-3-cresol; and (3) carrying out normal pressure rectification on the reaction product mixed solution to recover methanol, adding a sodium hydroxide solution for neutralization, and carrying out reduced pressure rectification to obtain petrochemical grade phenol, pharmaceutical grade m-cresol, o-isopropyl phenol, p-isopropyl phenol crude products, 2-isopropyl-5-cresol and 4-isopropyl-3-cresol.

This invention provides a method for separating an oil-phenol mixture by in-situ extraction coupled with back-extraction and flash evaporation using ionic liquid. First, the oil-phenol mixture is countercurrently extracted in an extraction tower with a 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid to obtain a dephenolized oil and a phenol-containing extract. The extract then enters a back-extraction tower, where it is countercurrently contacted with low-carbon alkanes to remove most of the neutral oil, yielding a back-extraction extract and a back-extraction raffinate. The back-extraction raffinate is flashed in tank F1 to remove residual neutral oil, yielding a phenol-rich material; it is then flashed in tank F2 to obtain the phenol product and regenerate the ionic liquid extractant. The back-extraction extract is flashed in tank F3 to obtain a neutral oil-rich fraction and regenerate the back-extraction agent. The neutral oil-rich fraction is combined with the top product from tower F1 and returned to the extraction tower for phenol recovery. This invention features a simple and stable process with high separation efficiency, high phenol product purity, and a neutral oil content of less than 1%. The extractant and back-extraction agent used are reusable.

The invention discloses a preparation method of low-chromaticity 2.4. 6-tri (dimethylaminomethyl) phenol and an obtained product, and the preparation method of low-chromaticity 2.4. 6-tri (dimethylaminomethyl) phenol comprises the following steps: mixing liquid dimethylamine, liquid phenol and a formaldehyde aqueous solution, carrying out a liquid phase reaction, after the reaction is completed, carrying out heating aging, then carrying out standing layering, and discharging a lower-layer aqueous phase, so as to obtain the low-chromaticity 2.4. 6-tri (dimethylaminomethyl) phenol. And adding an acidic auxiliary agent into the retained organic phase, and heating again to remove moisture in the product to obtain 2.4. 6-tri (dimethylaminomethyl) phenol. The 2.4. 6-tri (dimethylaminomethyl) phenol prepared by the preparation method is low in product chroma, low in unit consumption, high in yield, stable in structure, simple, convenient and easy to operate, and suitable for industrial application.