27 results about "Methyl tert-butyl ether" patented technology

The invention provides blended gasoline as well as a preparation method and application thereof. The blended gasoline comprises the following components in percentage by weight: 40-60% of mixed light hydrocarbon, 25-40% of direct coal liquefaction naphtha and 8-22% of methyl tert-butyl ether, wherein the mixed light hydrocarbon is fraction hydrocarbon prepared by rectifying MTP byproduct mixed aromatic hydrocarbon, and the distillation range of the mixed light hydrocarbon is less than or equal to 165 DEG C. The finished product blended gasoline fully combines the advantages of the mixed light hydrocarbon with the distillation range of less than or equal to 165 DEG C, the direct coal liquefaction naphtha and the methyl tert-butyl ether in the MTP byproduct mixed aromatic hydrocarbon, realizes value-added utilization of the MTP byproduct mixed aromatic hydrocarbon, has the advantages of low colloid and mechanical impurity content and low sulfur content, can fully burn and release high heat value when being applied to the field of automobiles, and has the advantages of low energy consumption and low cost. Sediments generated during combustion are few, the content of sulfide in tail gas is low, and pollution to the environment is small.

The invention relates to the technical field of solid waste recovery, and provides a method for efficiently, simply and conveniently recovering asphalt based on a small amount of asphalt mixture, which comprises the following steps: S1, taking an asphalt mixture sample, adding water, and carrying out ultrasonic cleaning to remove impurities on the surface of the sample; s2, putting the impurity-removed and dried sample into a mixed solvent, and soaking for 20-40 minutes until the surface of the aggregate is not coated with asphalt; the mixed solvent is prepared from 1, 1-diethoxyethane and methyl tert-butyl ether; and S3, carrying out reduced pressure suction filtration and centrifugation on the mixture obtained in the step S2, placing the supernatant in a fuming cupboard for preliminary volatilization, and then placing the supernatant in a forced air drying oven for solvent evaporation at 60-105 DEG C to obtain the recycled asphalt. According to the method, the low-boiling-point solvent 1, 1-diethoxyethane and methyl tert-butyl ether are compounded, and subsequent reduced-pressure suction filtration, centrifugation and volatilization treatment are combined, so that the method for efficiently, simply and conveniently recovering the asphalt from the asphalt mixture is realized, and compared with an existing Ambusan method and a rotary evaporator method, the method has the advantages that the recovered asphalt is high in fidelity, and the recovery rate is high. And no organic solvent is left.

This invention relates to an alcohol-based fuel additive, its preparation method, and its application, belonging to the technical field of diesel fuel additives. The additive, by weight, comprises: a mixture of C3-C10 fatty alcohols, fatty acid methyl esters, methyl tert-butyl ether, isoamyl nitrate, dimethyl carbonate, and diesel fuel. The mass ratio of methyl tert-butyl ether to dimethyl carbonate is [value missing]. This invention employs a stepped feeding process, solving the problem of combustion improver failure caused by high shear heat generation by cooling the fuel before adding isoamyl nitrate, and ensuring long-term fuel stability at -10°C using a specific polarity gradient ratio. The fuel prepared by this invention has a high cetane number, strong power, and good anti-stratification effect, making it suitable for compression ignition engines.

The application relates to a high-purity melittin purification method using pH zone refining countercurrent chromatography. In order to overcome the defects of the prior art, a solvent system composed of 4-12% methyl tert-butyl ether, 42-50% n-butanol, 4-12% acetonitrile and 42-50% deionized water is used, a high-purity melittin solution is purified by using the pH zone refining countercurrent chromatography, and the finished high-purity melittin is obtained through concentration and drying. The application does not use solid fillers, does not cause loss to the sample, can almost recover all the melittin in the crude melittin, the yield is more than 90%, and the application is suitable for batch purification of high-purity melittin.

The invention relates to the field of chemical synthesis, in particular to a novel method for synthesizing beta-ethylthiobutyraldehyde, which comprises the following steps: S1, adding an anhydrous polar aprotic solvent which is dried by a 4A molecular sieve and subjected to nitrogen bubbling for 30 minutes to remove oxygen into a reactor provided with an external circulation cooling system under the conditions that the illumination intensity is less than or equal to 50lux in an amber glass reactor, and reacting for 1-2 hours at the temperature of 20-30 DEG C; the water content of the anhydrous polar aprotic solvent is less than or equal to 0.01%, the oxygen content of the anhydrous polar aprotic solvent is less than 5ppm, tetrahydrofuran, diethyl ether or methyl tert-butyl ether is selected as the solvent, the use amount of the solvent is 4 times of the mass of ethanethiol, ethanethiol with the purity of more than or equal to 99% and crotonaldehyde are added according to the molar ratio of 1: (1.05-1.2), high-purity nitrogen is introduced for replacement three times, the nitrogen micro-positive pressure is maintained in the whole process, and the temperature is controlled to be less than or equal to 10 DEG C through external circulation. According to the method, production can be performed in a low-temperature environment, triethylamine serving as a catalyst is not needed, so that unit consumption is lower, and the synthesized beta-ethylthiobutyraldehyde is more stable, less in decomposition and higher in yield and content due to low synthesis temperature.

Methods and compositions for the adsorptive removal of methyl tertiary butyl ether (MTBE) from contaminated water sources and systems. The compositions contain carbon fly ash doped with silver nanoparticles at specific mass ratios. Methods of preparing and characterizing the adsorbents are also provided.

The invention relates to the technical field of methyl tert-butyl ether, and discloses a methyl tert-butyl ether recovery device which comprises a tower body, a gas inlet pipeline, a pipeline and a plurality of observation windows are mounted on the surface of the tower body, an exhaust pipeline is mounted above the tower body, and a recovery mechanism is arranged on the inner wall of the tower body; the recovery mechanism comprises a chassis mounted in the inner wall of the tower body, a plurality of hollow pipes I are mounted on the inner wall of the chassis, and hollow pipes II are slidably connected to the inner walls of the hollow pipes I. According to the invention, the recovery mechanism is arranged, and a gas channel is formed by the plurality of groups of hollow pipes I and hollow pipes II, so that gas can uniformly enter the plurality of groups of hollow pipes I and hollow pipes II; according to the present invention, the adjusting assembly can control the movement of the upper disc and the hollow sleeve 2, the movement of the hollow sleeve 2 in the hollow sleeve 1, and the overall recovery rate can be significantly improved by adjusting the length of the gas path and prolonging the contact time with the liquid.

The present invention discloses a method for purifying camptothecin derivatives. Specifically, the present invention discloses a method for purifying camptothecin derivatives as shown in formula III, which comprises the following steps: solid-liquid separation of a mixture of a crude camptothecin derivative as shown in formula III, component A and component B; wherein component A is one or more of petroleum ether, n-heptane, n-pentane and n-hexane; component B is one or more of ether, isopropyl ether and methyl tert-butyl ether; the volume ratio of component A to component B is (4-100):1. The purification method of the present invention is simple and easy to operate, economical and convenient, and the obtained product has high purity, greatly reduced impurity content, high yield, and is suitable for commercial production.

The invention discloses a preparation method of 4-(2-pyridylazo)resorcinol: using ethanol as a solvent, 2-aminopyridine first undergoes a diazotization reaction with isoamyl nitrite, and then sodium ethoxide is added in batches to generate an ethanol solution of diazonium sodium salt; then the temperature is lowered to 0-10 °C, and an ethanol solution of resorcinol is started to be dropped to undergo an azo reaction to generate azo disodium salt. The ethanol solvent is concentrated, and then pure water is added for dissolution. Then, methyl tert-butyl ether is used to extract impurities, and the solid obtained after concentrating the aqueous phase is suspended and washed with acetone to obtain intermediate II. Intermediate II is then acidified to obtain a crude product; finally, the crude product is recrystallized with a certain proportion of ethanol and water to obtain a dark yellow-red solid, which is analyzed by inspection and is the target product 4-(2-pyridylazo)resorcinol. The high-purity 4-(2-pyridylazo)resorcinol prepared by the invention has an HPLC purity of over 99.5% and a total yield of over 90%.

The present invention relates to the technical field of solid waste recovery and provides a method for efficiently and conveniently recovering asphalt on the basis of a small amount of an asphalt mixture. The method comprises the following steps: S1, taking an asphalt mixture sample, adding water, and performing ultrasonic cleaning to wash away impurities from the surface of the sample; S2, placing the impurity-removed and dried sample in a mixed solvent for soaking for 20-40 min until the surface of an aggregate is not coated with asphalt, the mixed solvent comprising 1,1-diethoxyethane and methyl tert-butyl ether; and S3, performing vacuum filtration and centrifugation on the mixture in step S2 to separate out a supernatant, placing the supernatant in a fume hood for preliminary volatilization and then in an air blast drying oven to evaporate the solvent at 60-105ºC to obtain recovered asphalt. By means of the compounding of low-boiling solvents 1,1-diethoxyethane and methyl tert-butyl ether, combined with subsequent vacuum filtration, centrifugation and volatilization treatment, the present invention realizes an efficient and convenient method for recovering asphalt from the asphalt mixture. Compared with the existing Abson method and rotary evaporator method, the method has the advantages of high fidelity of recovered asphalt and no organic solvent residue.

The invention provides a method for synthesizing high-purity 5 '-DMT-2'-TBDMS protected nucleoside by a one-pot process, which comprises the following steps: sequentially adding DMT and TBDMS protecting groups on 5'hydroxyl and 2 'hydroxyl on glycosyl of a compound shown as a structural formula I to obtain a crude product of a compound shown as a structural formula II; and recrystallizing and purifying the crude product of the compound as shown in the structural formula II through a mixed solvent of diethyl ether and methyl tert-butyl ether to obtain a purified product of the compound as shown in the structural formula II, namely the high-purity 5 '-DMT-2'-TBDMS protected nucleoside. The method for synthesizing the high-purity 5 '-DMT-2'-TBDMS protected nucleoside by the one-pot method, provided by the invention, has the advantages of low cost, high product purity and simplicity in operation, and is suitable for industrial production.

The invention discloses a high-stability methanol energized fuel and a preparation method thereof.The high-stability methanol energized fuel is prepared from 70 to 75 parts of methanol, 3 to 5 parts of dimethyl carbonate, 3 to 4 parts of glycerol, 5 to 7 parts of high-carbon isoparaffin, 4 to 6 parts of bio-based high-carbon ester, 2 to 3 parts of bio-based emulsifier compound, 0.1 to 0.3 part of modified nano cerium oxide and 0.05 to 0.07 part of tri-tert-butyl phosphate; the corrosion inhibitor comprises the following components in parts by mass: 0.1 to 0.2 part of methyl tert-butyl ether and 0.03 to 0.05 part of benzotriazole. The high-stability methanol energized fuel disclosed by the invention has the stability and heat value of methanol fuel, and also has good temperature resistance; the preparation is simple, the operation is convenient, no additional heat source is needed, and the cost and energy consumption are reduced.

The invention relates to the technical field of removal agents, in particular to an oxygen-containing compound removal agent and a preparation method and application thereof. According to the oxygen-containing compound removal agent provided by the invention, the oxygen-containing compound removal agent comprises a molecular sieve subjected to acid treatment, attapulgite subjected to acid treatment and a metal compound; the metal oxide comprises a gallium metal compound, a zinc metal compound and a strontium metal compound. The oxygen-containing compound removing agent is large in particle strength, high in adsorption capacity, high in activation performance, capable of effectively enhancing selectivity to dimethyl ether, methyl alcohol and methyl tert-butyl ether (MTBE) and high in oxygen-containing compound removing efficiency.

The invention discloses a pretreatment optimization method for measuring vitamin E in sea buckthorn seed oil, and belongs to the technical field of analysis and detection. The invention aims to solve the problems of easy degradation of vitamin E, easy emulsification, low subsequent extraction efficiency and tedious operation in the saponification process of seabuckthorn seed oil in the prior art. The method comprises the following steps: firstly, mixing the sea buckthorn seed oil with an attapulgite and silicon dioxide composite adsorbent for pretreatment; under the protection of inert gas, a saponification reaction is carried out, and a saponification solution contains a composite antioxidant and a phase transfer catalyst; then carrying out automatic extraction by adopting a mixed solvent of ethyl acetate and methyl tert-butyl ether; and finally, purifying the extract through a solid-phase extraction column to obtain a vitamin E-containing component, and preparing the vitamin E-containing component into a test solution. The method is mainly used for providing an efficient, stable and reliable pretreatment sample for chromatographic determination of vitamin E in seabuckthorn seed oil. The invention discloses a pretreatment optimization method for measuring vitamin E in sea buckthorn seed oil.

The invention belongs to the technical field of chemical fuel, and particularly relates to alcohol-based fuel as well as a preparation method and application thereof. The alcohol-based fuel is prepared from the following raw materials in parts by weight: 20 to 40 parts of low-carbon alcohol, 10 to 25 parts of fusel oil, 40 to 50 parts of calorific value improver, 2 to 10 parts of combustion improver, 0.5 to 15 parts of stabilizer and 0.01 to 0.05 part of antioxidant, the alcohol-based fuel has the beneficial effects that the alcohol-based fuel takes low-carbon alcohol and fusel oil as a main fuel and a main solvent, the calorific value improver and the like are added to improve the calorific value of the fuel, methyl tert-butyl ether, acetone or isooctyl nitrate is taken as a combustion improver, dimethyl carbonate, fatty alcohol-polyoxyethylene ether or ferrocene (deferrization) is taken as a stabilizer, and 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate is taken as a combustion improver. According to the present invention, 2, 6-di-tert-butyl mixed phenol and N, N '-bis (salicylidene)-1, 2-propane diamine are adopted as the antioxidant and the metal deactivator, and accurate proportioning and scientific mixing are performed to obtain the high-calorific-value and high-cleanliness alcohol-based fuel oil, and the calorific value of the alcohol-based fuel reaches more than 8000 kcal / kg so as to completely meet the daily consumption use of the conventional boiler and kiln.

The invention provides a 2-phenyl aryl amide derivative and a preparation method thereof, in an inert atmosphere, tetrahydrofuran, 2-methyltetrahydrofuran, normal hexane, 1, 4-dioxane or methyl tert-butyl ether are used as reaction solvents, a 2-phenoxy benzamide derivative and an aryl Grignard reagent are used as raw materials, the raw materials are stirred at 25-100 DEG C for a reaction, and the 2-phenyl aryl amide derivative is obtained. And after the reaction is completed, separating and purifying a product to obtain the 2-phenyl aryl amide derivative. The method has the advantages of low cost, mild reaction conditions, high selectivity, high yield, low product separation and purification difficulty and the like, and the use of harsh conditions and transition metal catalysts is avoided.

The invention relates to a method for preparing a didarcib crystal form, which comprises the following steps: dissolving didarcib in a first organic solvent, cooling to separate out part of didarcib crystals, and adding a second organic solvent to further separate out crystals; according to the method, potential safety hazards and health risks caused by adding a low-boiling-point solvent (methyl tert-butyl ether) at a high temperature are avoided; the selected solvent is safe, low in cost and easy to obtain, the obtained crystal is high in purity and yield, and industrial production is facilitated.

The present application provides a method for preparing maribavir, which comprises preparing maribavir methyl tert-butyl ether solvate from a compound of formula III, and then preparing maribavir; the method is simple in process and convenient for industrialized mass production.

The utility model belongs to the technical field of MTBE (Methyl Tert-Butyl Ether) production, and particularly relates to an MTBE production device taking C4 as a raw material. The MTBE production device taking C4 as the raw material comprises a raw material C4 pipeline and a methanol raw material tank, the raw material C4 pipeline is connected with a raw material preheater through a catalytic rectifying tower aftercooler, methanol in the methanol raw material tank is conveyed to the raw material preheater through a pipeline, an outlet of the raw material preheater is connected with an etherification reactor, and an outlet of the etherification reactor is connected with the methanol raw material tank. The etherification reactor is connected with a lower catalytic rectifying tower through a catalytic rectifying tower feeding heat exchanger and a catalytic rectifying tower preheater, and the lower catalytic rectifying tower is connected with an upper catalytic rectifying tower. According to the MTBE production device taking C4 as the raw material, the catalytic rectifying tower aftercooler and the tower bottom high-temperature MTBE raw material heat exchange system are arranged, so that a multi-stage waste heat recovery network is formed, steam condensate waste heat is used for preheating the raw material, the steam consumption is reduced, and energy conservation, consumption reduction and efficient utilization of resources are realized.

The invention relates to the field of gasoline alternative fuels, in particular to a clean and environment-friendly biofuel-gasoline alternative fuel and a preparation method thereof.The clean and environment-friendly biofuel-gasoline alternative fuel is prepared from dimethyl silicone oil, fatty acid methyl ester, polyoxymethylene dimethyl ether, mixed alcohol, ethylene glycol monomethyl ether, Fischer-Tropsch wax, low-carbon-number fatty alcohol, laurinol, high-carbon-number fatty alcohol and methyl tert-butyl ether; the energy-saving synergistic combustion improver is prepared from glycerin fatty acid ester, glycerin decanoate, xylene, diisopropyl ether, isopropanol, ethyl tert-butyl ether and an energy-saving synergistic combustion improver. In order to solve the problems that the quality guarantee period of gasoline is short and stratification and precipitation occur after the expiration date, polyoxymethylene dimethyl ether is used as an optimal solvent for clean energy added into the gasoline, a small amount of mixed alcohol, Fischer-Tropsch wax, dimethyl silicone oil, fatty acid methyl ester and the like are added, and then biological raw materials such as an energy-saving synergistic combustion improver and the like and coalification raw materials are added; the clean and environment-friendly biofuel-gasoline alternative fuel compounded by physical and chemical adsorption mixed thermal regulation physical blending reaction has a shelf life of more than 3 years.

The invention relates to the technical field of drug synthesis, in particular to a preparation method of a high-chiral-purity triazine diketone compound, which comprises the following steps of: performing chiral reduction on a compound I by using a borane reducing agent or performing chiral resolution on the compound I by using an oxazole boron catalyst to obtain an intermediate I; carrying out coupling reaction on the intermediate I and a compound II under the action of a phosphoric anhydride condensing agent to obtain an intermediate II; performing deprotection reaction on the intermediate II to obtain a triazine diketone compound crude product; the method comprises the following steps: extracting and concentrating a triazine diketone compound crude product, adding ethyl acetate and methyl tert-butyl ether, stirring and crystallizing to obtain the high-chiral-purity triazine diketone compound with the e.e.% value of 97.50%-98.64%, the preparation method is mild in reaction condition and simple in operation process, diastereoisomer impurities are not detected, the quality of the raw material medicine is favorably controlled, and the preparation method is expected to be applied to a large-scale production process and has a wide application prospect.

The invention discloses a preparation and purification method of a tricyclic intermediate of camptothecin, which comprises the following steps: S1, catalytic oxidation: carrying out catalytic oxidation reaction in toluene by taking a compound 1 as a substrate under the action of a chiral catalyst CB2, cumyl hydroperoxide and powdered potassium carbonate, and then separating a compound 2 from the reaction system; s2, deprotection: adding the compound 2 into a reaction flask, then adding trifluoroacetic acid and water for reaction, and then adding isopropanol and methyl tert-butyl ether for crystallization treatment to obtain a compound 3 crude product; s3, purification: adding the crude product of the compound 3 into a reaction flask, adding acetone, heating and stirring, cooling and stirring for reaction, filtering, concentrating and heating filtrate, rinsing solids on the reaction flask, cooling, crystallizing, and finally drying to obtain a pure product of the compound 3. The invention also discloses a method. The method has the advantages that the operation is simple, the cost is low, the chiral purity can reach more than 99.9%, and the large-scale industrial production of the (S)-hydroxylactone tricyclic compound is favorably realized.

The present disclosure provides a method and system for integrating MTBE production with isobutylene production, the method including isomerizing a mixed hydrocarbon feed stream to form an isobutane stream; dehydrogenating the isobutane stream to form an isobutylene stream; reacting the isobutylene stream with methanol to form an MTBE product stream; separating at least a portion of impurities from the MTBE product stream to form a MTBE feed stream; decomposing MTBE in the MTBE feed stream to form a decomposed MTBE product stream; treating the decomposed MTBE product stream with water to form a wash water stream comprising methanol and a water-washed product stream comprising isobutylene; separating methanol from the wash water stream to form a methanol recovery stream; separating at least a portion of DME and metal ions from the methanol recovery stream to form a purified methanol stream; and feeding the purified methanol stream to the MTBE synthesis reactor.

The present application relates to the field of groundwater remediation, and discloses a composition for groundwater remediation, application and method thereof.The composition contains a slow-release oxidant and an iron-based molecular sieve composite material; the slow-release oxidant has a core-shell structure, the shell layer is polylactic acid, and the core layer is a metal peroxide and citric acid; the iron-based molecular sieve composite material contains Silicalite-1 molecular sieve and Fe element loaded on the Silicalite-1 molecular sieve, and the weight ratio of the slow-release oxidant to the iron-based molecular sieve composite material is greater than or equal to 45.The composition for groundwater remediation has the advantages of high activity and durability, can achieve efficient and long-acting degradation of methyl tert-butyl ether in groundwater, and can more effectively remediate groundwater.

The invention belongs to the technical field of tackifying resin, and particularly relates to high-softening-point low-VOC (volatile organic compound) monomer resin as well as a preparation method and application thereof. The preparation method comprises the following steps: adding hydroxybutyl vinyl ether, maleic anhydride, an initiator and isopropanol into a three-neck flask, introducing nitrogen to replace air in the flask, starting a stirrer, reacting in an oil bath pan, and quickly cooling in an ice bath; the preparation method comprises the following steps: adding methyl tert-butyl ether into a three-neck flask to obtain a polymer precipitate, carrying out centrifugal separation to obtain a hydroxybutyl vinyl ether grafted maleic anhydride oligomer, adding the oligomer, alpha-methyl styrene, a styrene derivative and an ionic liquid into the three-neck flask, introducing nitrogen to replace air in the flask, adding a low-temperature water bath kettle, adding an initiator, and carrying out vacuum pumping; carrying out cationic polymerization reaction; and stopping the reaction after the reaction, washing and drying to obtain the monomer resin. Applications include hot melt adhesives and composite materials. The prepared monomer resin has narrow molecular weight distribution, high softening point and low VOC (volatile organic compound) performance.

The invention belongs to the technical field of synthetic fuel oil, and particularly relates to vehicle fuel oil synthesized from a coal-based chemical liquefied hydrogenation material and a preparation method of the vehicle fuel oil, and the vehicle fuel oil comprises the following components in parts by mass: 12-40 parts of basic component oil; 8-68 parts of an antiknock agent; 19-62 parts of a density regulator; 3-50 parts of an ignition accelerator; the basic component oil comprises liquid wax and naphtha; the antiknock agent is prepared from dimethylbenzene, trimethylbenzene, alkylated oil, methyl tertiary butyl ether, isooctane and pentane; the density regulator comprises C9 and C10 heavy aromatics, white oil, aviation kerosene and solvent oil; the ignition accelerant comprises raffinate oil, topped oil, C5, light hydrocarbon and light oil. According to the invention, the vehicle fuel oil is prepared from the coal-based chemical liquefied hydrogenation material as the raw material, the dependence on petroleum resources is reduced, and through the synergistic effect of the basic component oil, the antiknock agent, the density regulator and the ignition accelerator, the vehicle fuel oil has the anti-knock property, the combustion efficiency and the low-temperature performance, and is excellent, low-carbon and environment-friendly vehicle fuel oil.

The present application provides a preservation method and application of Compound 1. The Chinese chemical name of Compound 1 is Methyl 2-(2-((1-(3-(((1-(tert-butyl)-5-chloro-6-oxo-1,6-dihydropyridazin-4-yl)oxy)methyl)benzyl)-1H-1,2,3-triazol-4-yl)methoxy)ethoxy)ethyl-4-methylbenzenesulfonate, and its structural formula is as follows. Through the research of the applicant, it is found that dispersing Compound 1 in an organic solvent can reduce its degradation rate. In the present application, Compound 1 is stored in dimethyl sulfoxide, acetonitrile, methyl tert-butyl ether or dichloromethane. At the storage temperature provided in the present application, the storage temperature is -70°C to 30°C, and at the concentration of Compound 1 stored in the above solution provided in the present application, which is lower than 250 mg / ml, Compound 1 can be stably stored, and the content of specific impurities and the total amount of impurities do not increase significantly, meeting the quality standards as a radiopharmaceutical precursor.