167 results about "Methyl t-butyl ether" patented technology

An environmentally clean dual fuel for an internal combustion engine, comprising acetylene as a primary fuel and a combustible fuel, such as one or more fluids selected from an alcohol such as ethanol, methanol or any other alcohol or alcohols from the group comprising C1-C20 carbon chains, ethers such as from the group comprising dimethyl ether, diethyl ether, methyl t-butyl ether, ethyl t-butyl ether, t-amyl methyl ether, di-isopropyl ether and the like, low-molecular-weight esters such as from the group comprising methyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate and the like, or other suitable combustible fluid such as mineral spirits and the like, as a secondary fuel for operatively preventing early ignition and knock arising from the primary fuel. The dual fuel, internal combustion system, which generally utilizes a two-stage process for start-up and operation and can be operated with air- or liquid-cooling, is environmentally clean with hydrocarbon, CO, NOx, and SOx emissions substantially eliminated.

An environmentally clean dual fuel for use in an internal combustion engine, comprising acetylene as a primary fuel and a combustible fuel, such as one or more fluids selected from an alcohol such as ethanol, methanol or any other alcohol or alcohols from the group comprising C₁-C₂₀ carbon chains, ethers such as from the group comprising dimethyl ether, diethyl ether, methyl t-butyl ether, ethyl t-butyl ether, t-amyl methyl ether, di-isopropyl ether and the like, low-molecular-weight esters such as from the group comprising methyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, ethyl malate, and butyl malate, and the like, or other suitable combustible fluid such as mineral spirits and the like, as a secondary fuel for operatively preventing early ignition and knock arising from the primary fuel.

The invention relates to an ether production technology and especially relates to a method and production device for preparing methyl tertiary-butyl ether (MTBE) by a reaction of tertiary butanol and methanol. The method comprises that tertiary butanol and methanol are mixed and undergo a reaction to produce mixed gas, the mixed gas is fed into an extraction tower and is extracted, isobutene and MTBE are distilled off from the tower top, tertiary butanol, methanol, a trace amount of MTBE, water and an extractant flow out of the tower bottom, methanol is supplied for a tower top component of the extraction tower, the mixture is fed into a catalytic distillation tower, a methanol- and isobutene-containing tower top product of the catalytic distillation tower is fed back to a reactor and then undergoes a reaction, the MTBE is discharged from the bottom of the catalytic distillation tower, the materials discharged from the bottom of the catalytic distillation tower enters into a first extractant recovery tower, tertiary butanol, methanol and a trace amount of MTBE are distilled off from the top of the first extractant recovery tower, then are fed back to the reactor and then undergo a reaction, and the extractant and water flow out of the tower bottom, then enter into a second extractant recovery tower and then is recovered for recycle by reduced pressure distillation. The method and device solve the problem of azeotropy of tertiary butanol and water and improve a tertiary butanol one-step conversion rate to 87-94%.

The invention discloses a method for efficiently extracting carotenoids in yellow peach fruits and determining the carotenoids in the yellow peach fruits by a liquid phase. Extracting conditions are as follows: the material-liquid ratio of pulp to an extracting agent acetone is 1 to 6 (g/mL), and ultrasonic light-shielding assisted extraction is carried out for 1 hour; chromatographic conditions are as follows: a YMC-C30 type chromatographic column is adopted; a mobile phase comprises methyl tert-butyl ether methanol with a ratio being 30 to 70; an isocratic elution manner is adopted; a flow speed is equal to 1.0mL/min; the wavelength is 450nm; the column temperature is 25 DEG C; a sample feeding amount is 20 microliters; and the time lasts for 18 minutes. According to the method for efficiently extracting the carotenoids in the yellow peach fruits and determining the carotenoids in the yellow peach fruits by the liquid phase, the extraction material-liquid ratio is 1 to 6 (g/mL), the ultrasonic light-shielding assisted extraction is carried out for 1 hour and the methyl tert-butyl ether and the methanol with the ratio of 30 to 70 are used as the mobile phase for carrying out the isocratic elution; the three conditions are combined so that a plurality of types of carotenoids in the yellow peach fruits can be effectively and completely extracted and rapidly and accurately determined; and the method is easy to operate, free of saponification and gradient elution, good in repeatability of a determined result, high in accuracy and short in liquid phase time.

The present invention relates to the liquid fuel technical field, in particular to an alcohol hydrocarbon complex liquid fuel for a car and a preparation method thereof. The compositions in percentage by weight of the liquid fuel are: 20 to 40 percent of alcohol, 40 to 60 percent of light hydrocarbon, 8 to 12 percent of solvent naphtha, 10 to 15 percent of methyl tert-butyl ether, and 0.01 to 0.05 percent of functional additive, wherein the alcohol is methanol or ethanol, the light hydrocarbon is naphtha or light hydrocarbon between C6 and C12. The method comprises the following steps of: mixing the 20 to 40 percent of alcohol with the 0.01 to 0.05 percent of functional additive at a the temperature of between 0 and 20 DEG C; stirring for 10 minutes to obtain a mixed solution A; mixing the 40 to 60 percent of light hydrocarbon and the 8 to 12 percent of solvent naphtha, and then stirring for 10 minutes to obtain a mixed solution B; mixing the mixed solution A with the 10 to 15 percent of methyl tert-butyl ether, and then stirring for 10 minutes; mixing with the mixed solution B, and stirring for 10 minutes and sealing for 24 hours, and thus obtaining the product. Compared with the non-premium grade gasoline, the product is increased in oxygen content, sufficient in combustion, beneficial to environment protection, and can reduce the noxious gas of the automobile exhaust emission. Not only the cost is low and the material is easy to get, but also the required devices are less and the process is simple.

The invention relates to a solid acid catalyst used in reactions for preparing tert-olefins by cracking tert-alkyl ethers, a preparation method and an application thereof, wherein the content of sulfides in the catalyst is calculated by sulfur and accounts for 0.1-15 percent by weight of the weight of alumina, and the content of fluorides is calculated by fluorine and accounts for 0.1-10 percent by weight of the weight of alumina. The catalyst uses sulfur compounds and solution containing fluorine compounds to process an alumina carrier and is prepared by filtration, drying and calcination. The catalyst is used in the reactions for preparing the tert-olefins by cracking the tert-alkyl ethers, for example, the reaction for preparing isobutene by cracking methyl tert-butyl ether, thereby having high conversion rate, high selectivity of tert-butene and joint product methanol, high product purity as well as good stability and being capable of being used under the condition of substantial increase of feed loads particularly.

The invention discloses a process method for preparing isobutene through methyl tertiary-butyl ether cracking. According to the invention, methyl tertiary-butyl ether is subjected to a cracking reaction in a reactor; an obtained cracking product is subjected to heat exchange cooling until the temperature is higher than 50 DEG C and no higher than 90 DEG C; an obtained cooling product is separated in a separator; a gas-phase product is discharged from the upper part of the separator, and enters a water washing tower; a product discharged from the upper part of the water washing tower sequentially enters an isobutene de-heavy tower and an isobutene de-light tower, such that an isobutene product is obtained. According to the method, water consumption of the water washing tower is reduced, and washing effect of the water washing tower is improved. Also, methanol recovery tower and methanol rectification tower work loads are greatly reduced, and energy consumption is reduced. The prepared isobutene can reach polymerization-grade requirements.

The invention discloses a chiral analysis bonded phase chromatography-tandem mass spectrometry method for nicotine in tobacco juice. The method is characterized by comprising the following steps: infiltrating an electronic tobacco juice sample with a sodium hydroxide solution, extracting by using a methyl tertiary butyl ether and methanol solution, performing matrix dispersion solid-phase extraction and purification on extract liquor, analyzing by using a tandem mass-bonded phase chromatography tandem mass spectrometry method with two chiral columns, and performing quantitative detection on the ratio of S-(-)-nicotine to R-(+)-nicotine in the electronic tobacco juice by using a peak area normalization method. By adopting the detection method disclosed by the invention, a sample extraction and purification method is simple and efficient, contamination of the sample liquid to chromatographic columns can be reduced, the bonded phase chromatography tandem mass spectrometry method is high in sensitivity, good in specificity and short in analysis time, false positive can be excluded, and chiral analysis on the nicotine in large scales of electronic tobacco juice samples can be met.

The invention provides a method for synthesizing tert-butylated hydroxyanisole under the catalytic action of a hydrogen Y molecular sieve by using p-methoxy phenol and methyl tert-butyl ether as raw materials. In the method, the Y molecular sieve with a hydrogen Si/Al ratio of 2.6-7.6 is used, the reaction time is 15-180 min, the reaction temperature is 80-180 DEG C, the p-methoxy phenol conversion rate is 21-99 percent and the tert-butylated hydroxyanisole yield is 14-74 percent. The invention adopts a catalyst which has low cost and can be repeatedly used through simple solvent washing or roasting treatment, can solve the problems of unavailable catalyst recovery and great acidic wastewater discharge of a traditional tert-butylated hydroxyanisole production process through an F-C (Friedel-Crafts) reaction and has important industrial application prospects, and meanwhile, the catalyst and the reaction process, adopted in the method, benefits the improvement of the production efficiency.

The invention provides a catalyst for methyl tert-butyl ether cracking reaction to prepare isobutene and a preparation method thereof. The catalyst is prepared through supporting boron trifluoride with perfluorinated sulfonic resin as a support. Perfluorinated sulfonic resin supplies a B-acidity active site to the catalyst, and boron trifluoride supplies an L-acidity active site to the catalyst, so that the temperature resistance of the catalyst is high, the catalyst can still keep relatively-high activity after long-term operation, and the service life of the catalyst is long.

The invention discloses a double-rectifying-tower series separation and purification method for recovery of methyl tert-butyl ether-tetrahydrofuran in waste liquid of a statins synthesis process, the method is as follows: leading the waste liquid of the statins synthesis process into a packed tower I, controlling the tower top temperature at 30-40 DEG C for distillation treatment to obtain an isoprene and water mixture from the tower top, and then obtaining isoprene by further layering treatment; leading a tower kettle discharging liquid of the packed tower I into a packed tower II, and controlling the tower top temperature at 50-65 DEG C for distillation treatment to obtain an methyl tert-butyl ether-tetrahydrofuran mixed solvent from the tower top of the packed tower II. According to the method, two packed distillation towers are in series for operation, the separation operation process is low in energy consumption and simple in process, and can improve the recovery rate of the solvent methyl tert-butyl ether-tetrahydrofuran, the economic benefit can be improved, and at the same time the environmental pollution and destruction can be reduced.

The invention relates to a preparation method of ethylene glycol mono-tert-butyl ether, and belongs to the technical field of organic chemical engineering. The preparation method of the ethylene glycol mono-tert-butyl ether provided by the invention uses ethylene glycol and methyl tert-butyl ether as raw materials, uses a solid acid catalyst, and uses a fixed bed reaction and a reactive distillation process to prepare the ethylene glycol mono-tert-butyl ether. The method has low reaction pressure, a simple process flow and low production costs, and belongs to environment-friendly processes.

The invention relates to a pretreatment method, a detection method and a kit for simultaneously detecting multiple steroid hormones in a blood sample. The pretreatment method comprises the following steps: 1), preliminarily extracting the steroid hormone in a serum sample by using methyl tert-butyl ether; 2), performing centrifuging, taking supernatant, and carrying out sufficient alkali washing with an alkaline solution; and 3), performing centrifuging after alkali washing, taking supernate, performing freezing and blow-drying, and redissolving the obtained solid components to obtain a to-be-detected solution for simultaneously detecting various steroid hormones. According to the method, at least five steroid hormones of 17-hydroxy progesterone, androstenedione, cortisol, 21-deoxycortisoland 11-deoxycortisol can be separated at the same time, the separation effect is good, and the operation is simple and convenient.

The invention provides a preparation method of a nano-assembly with an AIE effect. The preparation method comprises the following steps: adding TPE-2Br and anhydrous pyridine into an anhydrous chloroform solution, carrying out a reflux reaction at 65-70 DEG C under the protection of nitrogen, conducting cooling to room temperature, performing filtering, precipitating the obtained solution in methyl tert-butyl ether, performing centrifuging, removing a supernatant, and carrying out drying to obtain a one-dimensional nano-assembly TPE-ON; and dissolving TPE-ON in methanol, adding a sodium methylbenzene sulfonate solution, carrying out a stirring reaction at room temperature, performing extracting with dichloromethane, successively carrying out washing, drying and filtering, carrying out spin-drying on the obtained filtrate, and carrying out column chromatography separation and purification to obtain the two-dimensional nano-assembly TPE-ONS. By changing counter ions in molecules, conversion from the one-dimensional fiber assembly with AIE properties to the two-dimensional sheet assembly is realized. The fluorescence intensity of the TPE-ONS is 2-2.5 times the fluorescence intensityof the TPE-ON. In a mixed solution of TPE-ON and TPE-ONS, the fluorescence intensity and a TPE-ONS content show a certain correlation, namely Y is equal to 2113.71 + 5163.56x-2966.07X<2>; and the relative content of TPE-ON and TPE-ONS can be quantitatively detected and the exchange process of TPE-ON and TPE-ONS can be monitored through the correlation.

The invention relates to a method for producing n-butene from isobutene, which comprises the following steps of: (1) feeding mixed C4 hydrocarbon containing isobutene into an etherification reactor for pre-etherification to enable most isobutene in the C4 hydrocarbon raw material to react with methanol to generate methyl tert-butyl ether, feeding a pre-etherification product into a catalytic distillation tower to enable unreacted isobutene to be completely etherified, and rectifying to separate an etherification product so as to obtain methyl tert-butyl ether and a C4 hydrocarbon product without isobutene; (2) cracking the methyl tert-butyl ether to generate isobutene and methanol; and (3) feeding the isobutene obtained by cracking into a normalizing unit, performing normalizing reaction under the conditions of 280-480 DEG C and 0.05-1.0 MPa, removing C5<+> heavy components from the normalizing reaction product, and returning the normalizing reaction product and the methanol obtained in the step (2) to the etherification reactor in the step (1). According to the method, isobutene in the raw materials can be converted into a C4 product which is rich in n-butene and hardly contain isobutene, and an effective way is provided for utilization of isobutene and MTBE.

The invention relates to the technical field of sodium ion battery electrolyte materials, in particular to a preparation method and application of sodium bis (fluorosulfonyl) imide. The preparation method comprises the following steps: in an inert atmosphere, uniformly mixing imidodisulfuryl fluoride, a sodium source and a non-aqueous solvent, then carrying out a reaction, and after the reaction is completed, carrying out solid-liquid separation to obtain imidodisulfuryl fluoride sodium; the non-aqueous solvent comprises at least one of acetonitrile, valeronitrile, pyridine, chloroethanol, chloroform, n-propanol, toluene, diethyl ether, acetone, tetrahydrofuran, xylene, dimethyl sulfoxide, N, N-dimethylformamide and methyl tert-butyl ether; the sodium source comprises at least one of sodium hydroxide, sodium bicarbonate and sodium carbonate. According to the present invention, the bis (fluorosulfonyl) imide and the sodium source are subjected to the reaction in the non-aqueous solvent capable of forming the azeotrope with water to obtain the bis (fluorosulfonyl) imide sodium, such that the water removal process is simplified, the impurity introduction during the water removal process is avoided, the water content in the product is effectively controlled, and the yield and the main content of the bis (fluorosulfonyl) imide sodium are improved.

The present invention provides a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included); a method for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst; and a reactor used for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether, in which a Mo—Bi—Nb based composite metal oxide (with the proviso that Te is not included) is used as a catalyst. Further, the present invention provides a method for producing (meth)acrylic acid from at least one reactant selected from the group consisting of propylene, propane, isobutylene, t-butyl alcohol and methyl-t-butyl ether by using a Mo—Bi—Nb based composite metal oxide as a catalyst, without any additional process of convening (meth)acrolein into (meth)acrylic acid.

The invention discloses a tungsten complex as well as a preparation method and application thereof and belongs to the technical field of organic chemistry. The preparation method of the tungsten complex comprises the following steps: 1) mixing tungsten hexachloride and dichloromethane, dropwise adding cyclopentene, heating, carrying out reflux reaction, filtering, adding ethylene glycol dimethyl ether into afiltrate, filtering after the reaction, washing a filter residue with methyl tert-butyl ether, and carrying out vacuum drying to obtain a product A; 2) mixing the product A with cyclopentadienyl lithium and methyl tert-butyl ether, reacting overnight, filtering, reacting an obtained solid with ethylene glycol dimethyl ether, filtering again, washing asolid product with tetrahydrofuran,ethanol and methyl tert-butyl ether, and drying in vacuum to obtain a product B; and 3) mixing the product B with methyl tert-butyl ether, adding lithium dialkylamide in batches while stirring, reacting overnight at room temperature, pumping out the solvent, adding an alkane solvent, extracting, filtering, and pumping out the alkane solvent to obtain bis (dialkylamino) bis (cyclopentadienyl) tungsten. The tungsten complex prepared by the invention can be used for preparing tungsten sulfide films.

The invention provides a preparation method of sodium valproate, and belongs to the technical field of medicine synthesis. The method comprises the following steps: by taking ethyl valerate as a raw material, adding a methyl tert-butyl ether solution of a pyrrole metal reagent into an ether solution of ethyl valerate, then adding halopropane, carrying out an alkylation reaction, adding a weakly acidic solution in a dropwise manner to terminate the reaction after the reaction is finished, and washing with water to obtain an intermediate product; and adding a sodium hydroxide solution into the alcohol solvent of the intermediate product, carrying out a saponification reaction, and purifying to obtain sodium valproate after the saponification reaction is finished. The method is short in reaction route, high in total yield, easily available in raw materials, low in cost, high in operability and suitable for industrialization. The total molar yield of sodium valproate prepared by the methodis greater than or equal to 86.0%, and the purity of the final product is greater than or equal to 99.5%.