170 results about "Sulfolane" patented technology

The invention discloses a synthesis and purification method of electronic-grade diborane, and relates to the technical field of diborane synthesis, and the synthesis and purification method has the advantages that cation 1-ethyl-3-methylimidazole in ionic liquid has a relatively large volume and a specific spatial configuration; the ionic liquid can be close to reactants sodium borohydride and hydrogen through intermolecular force, meanwhile, the anion bis (trifluoromethanesulfonyl) imide salt has high polarity and can attract reactant molecules with opposite charges, so that the ionic liquid makes full contact with the reactants, sulfolane has high dissolving capacity and can well dissolve sodium borohydride and hydrogen, and the ionic liquid can be separated from the reactants. Sodium borohydride and hydrogen are uniformly distributed in a mixed solvent, the sodium borohydride and hydrogen are efficiently reacted at proper temperature and pressure to generate high-purity diborane under the synergistic effect of the sodium borohydride and the hydrogen, sufficient contact of reactants is ensured by timely stirring in the reaction process, the reaction efficiency and the diborane yield are greatly improved, and the yield of the diborane is increased. And favorable conditions are created for subsequent preparation of electronic-grade diborane.

The invention provides a preparation method of a formaldehyde-free veneer artificial board, which comprises the following steps: (1) an adhesive is applied to the surface of a veneer, the adhesive is composed of a part A and a part B. The part A is one or more of isocyanate or modified isocyanate, or a mixture of the isocyanate and one or more of dimorpholinyl diethyl ether and sulfolane, or a mixture of the isocyanate and the modified isocyanate, or a mixture of the isocyanate and the modified isocyanate, or a mixture of the isocyanate and the modified isocyanate and one or more of dimorpholinyl diethyl ether and sulfolane, or a mixture of the isocyanate and the modified isocyanate; the part B is a hydroxyl-terminated compound or a mixture of the hydroxyl-terminated compound, a catalyst and one or more of sulfolane, preferably, the glue applying amount of the part B in different layers of veneers is different, and the applying amount is gradually increased from the surface layer veneer to the core layer veneer; (2) forming a plate blank by the veneers according to a certain rule; and (3) feeding the plate blank into a hot press to prepare the formaldehyde-free added veneer type artificial board. The method for producing the formaldehyde-free veneer type artificial board is simple and easy in process, high in hot-pressing production efficiency, excellent in mechanical property, good in flatness and low in warping degree, and can resist boiling in boiling water for 72 hours.

A non-aqueous organic high-voltage electrolyte and a lithium-ion battery comprising same. The non-aqueous organic high-voltage electrolyte comprises a lithium salt and a non-aqueous organic solvent. The non-aqueous organic solvent comprises a sulfolane derivative and a diluent, and the sulfolane derivative has the structure shown in formula (1). The non-aqueous organic high-voltage electrolyte exhibits high-voltage resistance, so that lithium-ion batteries using the electrolyte have excellent high-voltage cycle performance. The electrolyte is compatible with all currently known high-voltage positive electrode active materials and has flame-retardant properties, preventing potential combustion risks of the electrolyte while ensuring stable high-voltage charge-discharge cycling.

The invention belongs to the technical field of chemical synthesis, and particularly relates to a method for preparing 5-methylfurfural by using 2-methylfuran. The special solid acid catalyst is used for replacing traditional phosphorus oxychloride, hydrogen chloride and phosphorus-containing wastewater are eliminated from the source, and the sulfolane is used for replacing DMF (Dimethyl Formamide), so that solvent residues in the product are reduced. The solid catalyst SO4 < 2-> is modified to form a strong Bronsted acid site (-SO3H) which cooperates with Ce < 3 + > / Ce < 4 + > redox to inhibit carbon deposition, selectively activate 2-methylfuran alpha-C and inhibit side reactions, so that the selectivity and yield of a target product are improved. Na2CO3 neutralization is replaced by electrochemical neutralization, salt slag solid waste is eliminated, and environmental pollution is reduced. After the organic phase is dried and dewatered through a molecular sieve, most of the solvent is removed through rotary evaporation, and the residual crude product is subjected to centrifugal molecular distillation, so that unreacted raw materials and trace impurities are effectively removed, and the product purity is remarkably improved.

The invention discloses a two-phase absorbent for capturing CO2, which is characterized by being prepared from the following components in percentage by mass: 25%-30% of N-(2-ethoxyl) ethylenediamine, 0%-3% of N-aminoethyl piperazine, 0%-3% of 2-(1-ethoxyl) pyridine, 10%-13% of N, N '-diethyl ethylenediamine, 15%-20% of N, N'-diethylethylenediamine, 5%-10% of N, N '-diethylethylenediamine, 5%-10% of N, N'-diethylethylenediamine and the balance of water. The invention relates to a cleaning agent which is prepared from the following components in percentage by weight: 1 to 5 percent of N, N-diethylhydroxylamine, 1 to 5 percent of pentamethyldiethylenetriamine, 0 to 2 percent of tert-butylamine ethoxyethanol, 0 to 3 percent of 2-amino-2-methyl-propyl alcohol, 5 to 8 percent of sulfolane, 5 to 8 percent of dimethyl ether, 5 to 8 percent of p-xylene and 5 to 8 percent of n-butyl alcohol. The composition can be prepared by uniformly stirring the components. The preparation method is simple, and the prepared two-phase absorbent can improve the saturated absorption capacity, improve the desorption rate and optimize the performance of the phase change absorbent.

The invention provides a liquid sulfur removal agent and a preparation method thereof, and belongs to the technical field of natural gas hydrogen sulfide removal treatment.The liquid sulfur removal agent comprises, by weight, 36-66% of s-triazine derivatives, 5-8% of sulfolane, 2-5% of a pH control agent, 10-12% of a stabilizer, 5-8% of a scale inhibitor, 1-2% of a bactericide and the balance deionized water; wherein the s-triazine derivative is selected from a mixture of hexahydro-1, 3, 5-triacetyl-hexahydros-triazine, 1, 3, 5-triacetyl-hexahydros-triazine and 1, 3, 5-triazinane-2, 4-diketone, and the structural formula of the s-triazine derivative is shown in the description. The liquid sulfur removal agent is high in sulfur removal efficiency, good in corrosion inhibition and sterilization performance and not prone to scaling.

The invention relates to a solid adsorbent and a preparation method thereof. The solid adsorbent is composed of a porous solid carrier and a load. The porous solid carrier comprises a molecular sieve, silica gel, aluminum oxide, hydrotalcite and derivatives thereof. The load is composed of a main agent and an auxiliary agent, the main agent is polyamide-amine of which the terminal group is modified by amino and hydroxyl, and the molar ratio of the amino to the hydroxyl is 1: 1-1: 1.5; and the auxiliary agent is one or more of AMP (adenosine monophosphate), hydroxyethylpiperazine (HPZ), 1, 8-diazabicyclo undec-7-ene (DBU) and sulfolane (TS). The load accounts for 25%-150% of the weight of the porous solid carrier, and the mass fraction of the main agent in the load is 35%-80%. The method has the advantages of adjustable selectivity, high adsorption speed, large adsorption capacity and high removal rate of COS, methyl mercaptan, ethanethiol and other organic sulfur.

The invention discloses a sodium-ion battery electrolyte and a preparation method thereof, and relates to the technical field of sodium-ion batteries, the electrolyte comprises a sodium salt, a composite solvent, an additive and an auxiliary agent, the sodium salt is formed by compounding sodium bis (fluorosulfonyl) imide, sodium bis (trifluoromethanesulfonyl) imide and modified sodium bis (oxalato) borate, and the composite solvent is formed by compounding sulfolane, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol and 1, 3-butanediol. The auxiliary agent is nano-scale ZIF-8, the additive is 1, 3-propylene glycol dimethyl ether, dimethyl carbonate, fluoroethylene carbonate and ethyl acetate, the additive is modified 1, 3-propane sultone, trimethyl phosphate and hydroquinone dimethyl ether, and the auxiliary agent is nano-scale ZIF-8. According to the electrolyte, sodium bis (oxalato) borate is modified after being treated by hydrogen peroxide and has efficient hydrofluoric acid resistance, meanwhile, hydrofluoric acid generated by the reaction of fluorine-containing sodium salt and water in the electrolyte can be specifically removed by utilizing an auxiliary agent of the nano ZIF-8 and a synergistic effect formed by the sodium salt and the auxiliary agent, and damage of the hydrofluoric acid to a negative electrode SEI film is avoided; and the cycle life of the sodium ion battery is prolonged.

The invention discloses an absorbent for fine desulfurization and decarburization of blast furnace gas, and relates to the technical field of desulfurization and decarburization of blast furnace gas. The phase-splitting agent comprises a phase-splitting agent, an alcohol amine chemical absorbent and water, the phase-splitting agent is sulfolane, and the alcohol amine chemical absorbent is diethanol amine; wherein the mass fraction of sulfolane accounts for 50-70%, the mass fraction of diethanol amine accounts for 15-25%, the balance is water, and the sum of the mass fraction percentages of the components is 100%. According to the invention, a two-phase absorbent is innovatively adopted, and the absorbent aims to overcome the limitation of a traditional absorbent and realize the function of fine desulfurization cooperating with carbon capture; the invention further relates to a blast furnace gas fine desulfurization and decarbonization combined device and a using method thereof.

A lithium-ion battery with an electrode assembly is shown. The electrode assembly has a current collector and a positive active material layer on the current collector. The electrode assembly also has an electrolyte containing lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide in a ratio of 0.8 M to 0.2 M and a fluorinated phosphazene additive at 7 wt.% dissolved in a mixed solvent of ethylene carbonate, ethyl methyl carbonate, and sulfolane in a volume ratio of 25 / 73 / 2. The electrolyte permeates a surface of the positive active material layer to suppress electrochemical oxidation of the positive active material layer.

The disclosed method for recovering N-methyl pyrrolidone from complex waste liquid includes the following processes: pumping the NMP-containing waste liquid into a rectification one-effect tower after vacuum dehydration in a dehydration tower, condensing and collecting NMP at the top of the tower, and pumping the tower bottom into a rectification two-effect tower; obtaining NMP at the top of the rectification two-effect tower, sending the liquid residue to a depolymerization reactor after evaporation of the gas phase in a thin film evaporator, and condensing and condensing; performing side line extraction on the rectification two-effect tower and injecting sulfolane to extract heavy components, separating after mixing, returning the light phase to the rectification two-effect tower, and sending the heavy phase to a regeneration tower; collecting NMP-water azeotrope at the top of the regeneration tower to return to the dehydration tower, collecting sulfolane at the side line to return to the extraction cycle, and sending the concentrated residue at the bottom to the depolymerization reactor; sending the depolymerization gas obtained from the depolymerization reactor to a quenching tower, sending the cooling liquid of the quenching tower to a light-removing tower, sending the overhead product of the light-removing tower to sewage treatment, and collecting NMP at the tower bottom. The recovery treatment method has reasonable and efficient process flow, and has higher NMP yield for complex NMP-containing waste liquid.

The invention discloses fluorine-free polyether sulfone and its preparation method and application, and relates to the technical field of polyether sulfone. The technical scheme is: bisphenol compounds, bisphenol S, 4,4'-dichlorodiphenyl sulfone, acid binding agent, xylene, aprotic polar solvents with non-coplanar groups are mixed, and salt-forming reaction is carried out at 160-170°C under nitrogen protection, and reflux water separation is carried out for 1-3h at the same time, and xylene is steamed out, and the temperature continues to rise to 190-230°C, and the temperature is kept for 4-8h. Sulfolane is added to dilute the polymer solution and cool it to 70-110°C, and epichlorohydrin is added to continue the reaction for 2-10h. After the reaction is completed, the polymer solution is filtered, crushed, washed with an alcohol aqueous solution, and dried to obtain fluorine-free polyether sulfone. The present invention reduces its dielectric constant while keeping polyether sulfone resistant to high heat, and introduces epoxyalkyl groups into the polyether sulfone end group, and the solubility of polyether sulfone in conventional solvents is maintained under the premise of further reducing the dielectric constant.

The present invention belongs to the field of analysis and detection, and specifically relates to a method for simultaneously detecting residual organic solvents of N,N-dimethylformamide and sulfolane in amifostine by gas chromatography, which includes sample pretreatment and gas chromatograph detection method, and the steps are as follows: take amifostine, first add water to completely dissolve it, then add an organic solvent to filter after amifostine is precipitated, and take the filtrate and directly enter the gas chromatograph according to the gas chromatography detection conditions. The sample pretreatment method of the present invention can not only completely dissolve the DMF and sulfolane wrapped in the amifostine sample, but also remove the high-boiling point amifostine and directly enter the gas chromatograph, avoiding the contamination of the gas chromatograph and the detection interference caused by the degradation impurities of amifostine. The gas chromatograph detection method provided by the present invention can simultaneously and accurately detect the content of residual organic solvents of N,N-dimethylformamide and sulfolane in amifostine.

The utility model relates to the field of petrochemical engineering, and particularly discloses a sulfolane purifying device, which comprises a mixing tank and a separator, the mixing tank is used for mixing sulfolane and a solid purifying agent, the separator is used for separating sulfolane and the solid purifying agent, and the bottom of the mixing tank is connected with the separator. The separator is provided with a distribution disc, and the distribution disc comprises a plurality of distribution pipes which are communicated with one another. Each distribution pipe is independently provided with one or more connectors, each connector is connected with a filter grid, and the filter grids are used for filtering solid purifying agents. The device is further provided with a suction pump, one of the distribution pipes is connected with an inlet of the suction pump, and the suction pump is used for pumping out materials in the separator. Through the device, colored substances, acidic substances and hydrocarbon substances in the sulfolane can be purified and removed, so that the extraction performance of the sulfolane is recovered.

The invention discloses a super capacitor electrolyte and a super capacitor, and relates to the technical field of super capacitors, the super capacitor electrolyte comprises an electrolyte, a solvent and a functional additive; the electrolyte comprises spiro quaternary ammonium tetrafluoroborate and triethyl methyl ammonium tetrafluoroborate; the solvent comprises acetonitrile and sulfolane; the functional additive is a compound with a crown ether structure prepared through a thiol-ene click reaction; the addition amount of the functional additive is 1-10% of that of the solvent. The supercapacitor electrolyte system can resist high voltage and has wide temperature adaptability, that is, the supercapacitor electrolyte system has good high temperature resistance and low temperature resistance, so that the application requirement of a supercapacitor in a complex and severe environment is met.

The application discloses a kind of sodium ion battery electrolyte and preparation method thereof, it is related to sodium ion battery technical field, the electrolyte includes: sodium salt, composite solvent, additive and auxiliary agent, the sodium salt is sodium difluorosulfurylimide, sodium bis-trifluoromethanesulfonimide and modified sodium borate dihydroxide dioxalate compound composition, composite solvent is sulfolane-1,3-propanediol dimethyl ether, dimethyl carbonate, fluoroethylene carbonate and ethyl acetate, additive is modified 1,3-propane sulfone lactone, trimethyl phosphate and hydroquinone dimethyl ether, auxiliary agent is nano ZIF-8.This electrolyte sodium borate dihydroxide dioxalate is modified after hydrogen peroxide treatment, with high-efficiency anti-hydrofluoric acid capacity, while using the auxiliary agent of nano ZIF-8, sodium salt and auxiliary agent form synergistic effect can be targeted to remove hydrogen fluoride sodium salt and moisture reaction generated in electrolyte hydrofluoric acid, avoid the damage of hydrofluoric acid to negative electrode SEI film, and then improve the cycle life of sodium ion battery.

The invention discloses a photomagnetic response type deep eutectic solvent for absorbing acrylonitrile and a preparation method thereof, the photomagnetic response type deep eutectic solvent comprises a hydrogen bond donor and a hydrogen bond acceptor, the hydrogen bond donor is one of triethylene glycol monobutyl ether (TGBE), N-methyl pyrrolidone (NMP), triethylene glycol (TEG) and triethanolamine (TEOA); the hydrogen bond acceptor is one of tetraethylene glycol dimethyl ether (TGDE) and sulfolane (SUL). The ether bond is used as a hydrogen bond acceptor region, the hydroxyl is used as a hydrogen bond donor region, a negative electricity region of the ether bond and a positive electricity region of acrylonitrile form a hydrogen bond, a wide van der Waals force is formed between a non-polar region of TGBE and acrylonitrile, and the whole absorption efficiency is synergistically improved with the hydrogen bond effect of TGDE. In addition, the fluidity of the solvent is remarkably improved due to the low viscosity of the ethers, and mass transfer limitation caused by high viscosity is avoided, so that the ethers have excellent performance in a continuous absorption tower.

The invention relates to a low-energy-consumption flue gas carbon capture absorbent based on a composite amine solvent and application thereof. The absorbent comprises main amine, auxiliary amine, an accelerant, sulfolane, an antioxidant, a passivator, a stabilizer and water. The mass percent of water in the absorbent is 50%-70%. According to the invention, the absorbent with high water content is covered, the content of main amine in the absorbent is obviously reduced, and the corrosion to equipment is reduced. The antioxidant, the passivator and the stabilizer are added, so that the regeneration energy consumption can be reduced, the viscosity of the absorbent is reduced, and the application scene is expanded.

The present invention provides a preparation method of monoglyceride of oleic acid and its product, relating to the technical field of ester compound synthesis. The preparation method of the present invention comprises the following steps: (1) mixing glycerol, oleic acid and a solvent, adding a zeolite-p-toluenesulfonic acid catalyst to react, and obtaining an initial monoglyceride of oleic acid mixture; the molar ratio of glycerol to oleic acid is 1-2.5:1; the solvent is sulfolane and N,N-dimethylformamide in a mass ratio of 8:1-5; the ratio of the total mass of glycerol and oleic acid to the mass of the solvent is 4:1-3; (2) subjecting the initial monoglyceride of oleic acid mixture to a three-stage molecular distillation treatment: 100-200 Pa, 180-220°C, 50-80 Pa, 180-220°C, and 0-10 Pa, 180-230°C to obtain monoglyceride of oleic acid. The method of the present invention can improve the yield and purity of monoglyceride of oleic acid; mixing monoglyceride of oleic acid with a specific antioxidant can significantly improve the antioxidant properties of the product.

To provide a solid electrolyte capable of improving ion conductivity.SOLUTION: Wherein the molecular crystal includes a sulfolane-based compound and 112233, - hexafluoropropane-1, 3-disulfonimide lithium (LiCFSA) as a lithium salt, and the inorganic filler is SiO2, A normalized surface area WA (1g / gSE) of the inorganic filler is 15 to m2 / gSE, where W (g / gSE) is a mass of the inorganic filler with respect to m2 of the inorganic filler, and A (900m2 / g) is a specific surface area of the inorganic filler.SELECTED DRAWING: Figure 1

The utility model relates to the technical field of condensation circulation, and discloses a flash vapor phase condensation recycling device for sulfolane deep processing, which comprises a processing box, the bottom of the processing box is fixedly connected with supporting legs, the top of the processing box is fixedly connected with an air inlet, the bottom of the processing box is fixedly connected with an exhaust port, and the exhaust port is fixedly connected with an air outlet. A flow guide plate is fixedly connected into the treatment box, an auxiliary treatment mechanism is arranged on the left side of the treatment box, and an adjusting and pressure reducing mechanism is arranged at the top of the treatment box. In the using process, a connecting pipe connected with an air inlet in an inserted mode is conveniently clamped and limited through rotation of a two-way threaded rod and cooperation with a limiting rod; according to the invention, the structure is simple, the unforeseen circumstances such as falling in the use process are avoided, the heat dissipation fan works to rotate the connecting rod, the water tank can be fully cooled, meanwhile, the scraping plate reciprocates up and down to clean the filter plate, and the pressure in the treatment box can be conveniently adjusted through the rotation of the adjusting bolt and the cooperation of the sliding rod.

Provided is a method for preparing lactide by one-step reaction of lactic acid, which comprises mixing lactic acid raw material with a solvent and contacting with a catalyst, wherein the solvent comprises solvent I and solvent II, the solvent I is at least one selected from polar solvents such as benzophenone, dihydrolevoglucosenone, N-methylpyrrolidone, trichloropropane and sulfolane, the solvent II is C4-C12 alkane, substituted alkane, aromatic hydrocarbon or substituted aromatic hydrocarbon, the solubility of the solvent II for lactic acid at normal temperature is not more than 1 g lactic acid / 100 g solvent; and the reaction temperature and pressure are such that the solvent I does not boil in the reaction system. The mixed solvent is used as the liquid environment for preparing lactide by one-step reaction of lactic acid, the mixed solvent can be completely miscible with lactic acid in the reaction raw material, on the one hand, it can increase the contact between lactic acid and the solid catalyst, make the reaction more complete, reduce the generation of by-product poly lactic acid, and increase the selectivity of lactide; on the other hand, since the poly lactic acid can also be dissolved in the selected solvent, the adhesion of the poly lactic acid on the catalyst can be reduced, the influence of catalyst deactivation caused by carbon deposition can be reduced, and the service life of the catalyst can be improved.

The invention provides a natural gas desulfurization compound solvent as well as a preparation method and application thereof. The natural gas desulfurization compound solvent is prepared from the following components in parts by weight: 10 to 30 parts of diisohexyltertiary amine, 2 to 10 parts of sulfolane, 15 to 25 parts of N-methyldiethanolamine, 8 to 15 parts of nitrogen-containing heterocyclic compound and the balance of deionized water, and the nitrogen-containing heterocyclic compound comprises N-hydroxyethyl piperazine and / or N-hydroxypropyl piperazine. The bis-iso-hexyl tertiary amine, the N-methyldiethanolamine and the nitrogen-containing heterocyclic compound cooperate to reduce the absorption of carbon dioxide by improving the selectivity of organic sulfur, so that the removal efficiency of the organic sulfur in the natural gas is improved, and finally the purpose of improving the quality of the acid gas is achieved.

The present invention provides a composite solvent for extracting aromatic hydrocarbons, comprising 20-80% by mass of alkyl sulfolane, 10-60% by mass of sulfolane, 5-15% by mass of chain sulfone, and 0.1-3% by mass of glycol ether. The present invention also provides a method for extracting aromatic hydrocarbons, comprising: subjecting an aromatic hydrocarbon-containing distillate oil to countercurrent contact with the composite solvent described above in an extractive distillation tower for extractive distillation to obtain an extract material and a raffinate material; and distilling the extract material in a solvent recovery tower to obtain an aromatic hydrocarbon product and a crude circulating solvent. Through the above-mentioned technical solution, the present invention can maintain high selectivity and solubility of the composite solvent for raw materials with large fluctuations in aromatic hydrocarbon content during the long-term operation of aromatic hydrocarbon extraction, thereby enabling the aromatic hydrocarbon extraction device to operate stably and efficiently for a long period of time.

The present patent application discloses a high-temperature resistant multifunctional liquid desulfurizer for drilling fluid and a preparation method thereof. The desulfurizer comprises the following raw materials in parts by weight: main agent 1: 1,3,5-tributyl-hexahydro-s-triazine, 30-40%; main agent 2: triethanolamine, 10-15%; main agent 3: nano zinc oxide, 10-15%; solvent: sulfolane, 5-10%; adsorbent: graphene oxide, 10-15%; suspending agent: carboxymethyl cellulose, 0.1-0.2%; defoaming agent: one or more of methyl silicone oil, ethyl silicone oil, phenyl silicone oil, and methylphenyl silicone oil, 0.1-0.5%; dispersant: one or two of sodium polyacrylate and sodium polycarboxylate, 1-5%; and the remainder is water. The desulfurizer of the present invention is based on the high-efficiency desulfurization of triazine and alcoholamine liquid desulfurizers, and introduces graphene oxide and nano zinc oxide to improve the adsorption capacity and temperature resistance of the desulfurizer, reduce the drilling fluid loss, and improve the rheological properties. It can be used in both water-based and oil-based drilling fluids, has high desulfurization efficiency and fast speed, and meets the needs of on-site drilling desulfurization construction.

The invention relates to the technical field of waste liquid recovery, in particular to a method for recovering sulfolane waste liquid. The method comprises the following steps: step 1, carrying out suction filtration on the sulfolane wastewater, and evaporating out water from the sulfolane wastewater after suction filtration until no water is evaporated out, so as to obtain a first sulfolane mixed solution; 2, adding toluene into the first sulfolane mixed solution, stirring, and carrying out suction filtration to obtain a first filtrate, and 3, adding calcium oxide into the first filtrate, and carrying out stirring reflux to obtain a second sulfolane mixed solution; 4, the second sulfolane mixed solution is subjected to suction filtration to obtain a second filtrate, the second filtrate is subjected to reduced pressure distillation to remove methylbenzene, the obtained residual solution is sulfolane, the sulfolane is used for producing chlorpyridazinone, p-toluenesulfonic acid and urea, the sulfolane wastewater is generated after chlorpyridazinone, p-toluenesulfonic acid and urea are used for producing chlorpyridazinone, p-toluenesulfonic acid and urea are used for producing chlorpyridazinone, p-toluenesulfonic acid and urea are used for producing chlorpyridazinone, p-toluenesulfonic acid and urea. The recycling method can be used for efficiently recycling the sulfolane wastewater for producing chlorpheniramine, so that the recycled sulfolane solution can be repeatedly utilized.

The invention relates to the technical field of organic synthesis, and discloses a synthesis process of salicylaldehyde. The process sequentially comprises three core stages: firstly, performing mechanochemical ball milling pretreatment on phenol, a catalytic complexing agent and a molecular sieve drying agent in an inert atmosphere; then, transferring the pretreated mixture into a reactor containing a composite solvent of sulfolane and ionic liquid [BMIM] PF6, and dropwise adding a hexamethylenetetramine solution under programmed temperature control to perform formylation reaction; and finally, cooling the reaction liquid, filtering, hydrolyzing the filtrate by using a phosphoric acid aqueous solution with gradient concentration, and separating the product in real time through azeotropic distillation. According to the process, mechanical activation, composite solvent and programmed reaction are combined, the process is continuous, and the reaction efficiency and selectivity are improved.

The invention provides a continuous extractive distillation separation method of a p-xylene-propanol azeotropic mixture, and belongs to the technical field of separation. According to the method disclosed by the invention, any two of dibutyl phthalate, N-methyl pyrrolidone and sulfolane are used as extracting agents. The method comprises the following steps: adding a mixed raw material solution of p-xylene and propanol into an extraction tower, then adding an extraction agent, carrying out extractive distillation, extracting a propanol product from the top of the tower, introducing an extraction tower bottom product containing the extraction agent and p-xylene into a solvent recovery tower, and after distillation, extracting a p-xylene product from the top of the tower and discharging the extraction agent from the bottom of the solvent recovery tower; and introducing the extraction agent into the extraction tower for cyclic utilization. The method provided by the invention realizes the separation of the p-xylene-propanol azeotropic mixture, has high separation efficiency, is easy to regenerate and is environment-friendly, and the mass fraction of p-xylene in the separated propanol can be greater than or equal to 99.9%.

The utility model discloses a sulfolane refining device which comprises a vacuum degassing tower, an activated carbon filter, a processing bracket, a transfer box, a transfer structure and a stirring and feeding structure, and relates to the technical field of sulfolane production, the activated carbon filter can effectively remove organic matters, peculiar smell, colors and some chemical substances in liquid; the working principle is based on the adsorption capacity of activated carbon and the highly porous surface area, and a large number of attachment points are provided for impurities, so that the high efficiency of filtration is ensured; through automatic conveying devices such as a transfer structure, a transfer box and a stirring L-shaped drainage tube, accurate control and continuous flowing of liquid are achieved, and complexity and errors of manual operation are reduced; a stirring system consisting of a stirring driver, a stirring driving disc, a stirring magnet, a stirring conduction metal rod and the like can realize high-speed rotary stirring of raw material liquid, so that uniform mixing is ensured, and the reaction efficiency is improved.

A method for solid removal from slurry oil, and a method for solid removal and impurity removal from slurry oil. The method for solid removal from slurry oil comprises: (1) bringing an organic solvent in contact with a catalytic slurry oil to perform extraction, so as to obtain an upper raffinate phase 1 and a lower extract phase 1, wherein the mass ratio of the organic solvent to the catalytic slurry oil is not less than 0.5; and (2) removing solids and the organic solvent from the raffinate phase 1 to obtain a raffinate oil, and returning the removed organic solvent back to step (1) for extraction. The organic solvent is selected from one or more of furfural, DMF, N-methylpyrrolidone, dimethyl sulfoxide and sulfolane. The method can achieve the combined effect of deep solid removal from the slurry oil and enrichment of aromatics in the slurry oil, and can effectively enhance the comprehensive utilization value of the slurry oil. The method avoids the technical problem of low utilization rate of the effective components in the slurry oil caused by some useful components of the slurry oil also being removed while removing solid particles. Thus, the method increases the operation cycle of the slurry-oil solid removal technique and reduces energy consumption, thereby facilitating the amelioration of the technical problem of large-scale industrial application.