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104 results about "1-Methylimidazole" patented technology

1-Methylimidazole or N-methylimidazole is an aromatic heterocyclic organic compound with the formula CH₃C₃H₃N₂. It is a colourless liquid that is used as a specialty solvent, a base, and as a precursor to some ionic liquids. It is a fundamental nitrogen heterocycle and as such mimics for various nucleoside bases as well as histidine and histamine.

Crosslinking imidazole type polyether-ether-ketone anion-exchange membrane for fuel cell and preparation method thereof

The invention provides a crosslinking imidazole type polyether-ether-ketone anion-exchange membrane for a fuel cell, and a preparation method thereof, which belong to the fields of high polymer chemistry and anion-exchange membrane fuel cells. A structural formula of the anion-exchange membrane is as shown in a formula I. The invention also provides the preparation method of the crosslinking imidazole type polyether-ether-ketone anion-exchange membrane for the fuel cell. The method comprises the steps of firstly preparing polyether-ether-ketone; then carrying out bromination substitution reaction on methyl on the polyether-ether-ketone, and obtaining brominated polyether-ether-ketone; adding 1-methylimidazole and 1-vinyl imidazole into a brominated polyether-ether-ketone solution, and obtaining a mixed solution; finally pouring the mixed solution onto a glass plate, drying, and obtaining a paved membrane which is the crosslinking imidazole type polyether-ether-ketone anion-exchange membrane for the fuel cell. The anion-exchange membrane provided by the invention has high ionic conductance, high alkali resistance, higher mechanical performance and higher relative selectivity; the preparation method provided by the invention is simple and low in cost.
Owner:CHANGCHUN UNIV OF TECH

Ion liquid modified cellulose-based adsorbent as well as preparation method and application thereof

The invention discloses an ion liquid modified cellulose-based adsorbent as well as a preparation method and application thereof, and relates to the technical field of dye adsorption. The adsorbent can be degraded; the environment sustainable development is facilitated; the adsorbent can be widely applied to the printing and dying waste water treatment. The preparation method comprises the following steps of S1, adding cellulose, 2-bromo-propionic acid, p-toluenesulfonic acid and toluene into a container; connecting a water distributer on a container; S2, putting the container in an oil bath pot being 110 to 130 DEG C for constant temperature heating; performing condensing backflow for 7 to 10 hours; then, opening a side pipe piston of a water distributor to discharge out toluene-water mixed solution in the side pipe; evaporating out the toluene in the container to obtain a cellulose 2-bromopropionate coarse product; S3, performing post treatment on the cellulose and 2-bromopropionatecoarse product in the S2 to obtain dry cellulose 2-bromopropionate; S4, adding 1-methylimidazole and cellulose 2-bromopropionate dried in S3 into ethanol; performing water bath constant temperature stirring reaction for 24 to 48 hours at 40 to 70 DEG C; then, performing washing and drying to obtain the adsorbent. The method is simple; the used raw materials can be easily obtained.
Owner:SHAANXI UNIV OF SCI & TECH

Ion liquid catalyst for synthesizing diethyl carbonate by urea alcoholysis and preparation method thereof

The invention provides a process for synthesizing diethyl carbonate by urea alcoholysis through an ion liquid catalyst. The catalyst is imidazole metal salts ion liquid. The method comprises the steps of adding absolute ethyl alcohol, urea and the catalyst into a high-pressure reaction kettle, wherein the agitation speed is 700-1000 r/min, the mol ratio of the absolute ethyl alcohol to the urea ranges from 5: 1 to 15: 1; the reaction temperature is 160-230 DEG C, the reaction time is 4-10 hours and the use amount of the ion liquid catalyst is 1-10% of the mass of raw materials; cooling to room temperature and separating to obtain a product; enabling 1-methylimidazole and n-chlorobutane (in a mol ratio of 1: 1) to react to synthesize an intermediate chlorinated 1-butyl-3-methylimidazole (BMIMCl); and further enabling the BMIMCl to react with a metal chloride to obtain a product. The added metal chloride is Lewis acid of zinc chloride, magnesium chloride, aluminum chloride, lead chloride, calcium chloride and the like, and is prepared by adding one or more of the Lewis acid to react according to a certain ratio. The method has the advantages of green environmental friendliness, high repeated utilization rate, simple process, no corrosion, selectivity of close to 100%, high yield (which is close to 30% to the greatest extent) and the like.
Owner:JIANGNAN UNIV

Method for preparing chitosan immobilized Lewis acidic ionic liquid and DCPP synthesized by using chitosan immobilized Lewis acidic ionic liquid in presence of high-efficient catalyst

The invention relates to a method for preparing chitosan immobilized Lewis acidic ionic liquid and DCPP synthesized by using chitosan immobilized Lewis acidic ionic liquid in presence of high-efficient catalyst. The method is characterized by comprising the following steps: performing refluxing reaction on 1-methylimidazole and Y-chloropropyl trimethoxy silane in a mol ratio of 1:1 at a temperature of 70 DEG C for 70 hours; then performing reaction in a mol ratio of Lewis acid anhydrous ferric chloride to a prepared product of 2:1 at a temperature of 70 DEG C for 24 hours; dispersing the obtained ionic liquid containing ferricyanide and chitosan which is 2 times of the ionic liquid in mass in acetonitrile to reflux for 20 hours; performing rotary evaporation to remove a solvent; and performing soxhlet extraction on the obtained solid with methylene dichloride for 30 hours to obtain a chitosan immobilized acidic ionic liquid catalyst PmimCl-FeCl3-CS. Anhydrous aluminum chloride and indium chloride are used for replacing anhydrous ferric chloride and serve as a Lewis acid in turn to obtain PmimCl-AlCl3-CS and PmimCl-InCl3-CS respectively. The method has the advantages of low-price and readily available reaction raw materials, mild reaction and simple condition.
Owner:NANCHANG HANGKONG UNIVERSITY

Industrialization production method of 2-mercapto-1-methylimidazole

The invention relates to an industrialization production method of antithyroid drug 2-mercapto-1-methylimidazole. The method comprises: (a) reacting vinyl acetate with bromine in absolute ethyl alcohol, regulating a pH value into alkalescence after reaction, obtaining a bromoacetaldehyde diethyl acetal crude product after extraction and desolventization, and directly adding the bromoacetaldehyde diethyl acetal crude product into a next step of reaction; (b) performing aminolysis reaction of bromoacetaldehyde diethyl acetal and methylamine aqueous solution, and after completing reaction, obtaining methylamino acetal through distilling, separating and purifying after extraction and de-watering; (3) dropping hydrochloric acid into aqueous solution of methylamino acetal and potassium rhodanide; removing water in the reaction solution by reduced pressure distillation after reaction, removing a part insoluble in ethyl acetate from the obtained solid, dissolving residual solid into water with pH being 1-2, crystallizing to obtain 2-mercapto-1-methylimidazole with purity higher than 99%, and then vacuum-drying to obtain a finished product. The production method has a short product line, can obtain 2-mercapto-1-methylimidazole with high purity, and has a strong industrialization prospect.
Owner:XUZHOU B&C CHEM CO LTD

Synthesis and uses of beta-1-imidazole-2,3,4,6-tetrasulfo-D-glucopyranose hydrosulfate

The invention relates to synthesis and uses of beta-1-imidazole-2,3,4,6-tetrasulfo-D-glucopyranose hydrosulfate and belongs to hydrosulfate chemical synthesis by multi-component reactions and uses of the hydrosulfate. The synthesis includes: subjecting glucose 1 that is adopted as a raw material to acetylation to obtain a compound 2; performing bromination by adopting the compound 2 as a raw material to obtain a compound 3; reacting the compound 3 with 1-methylimidazole to obtain a compound 4; hydrolyzing the compound 4 under alkaline conditions to obtain a target compound 5; and reacting the compound 5 with chlorosulfonic acid to obtain a target product 6 that is the beta-1-imidazole-2,3,4,6-tetrasulfo-D-glucopyranose hydrosulfate. A five-component reaction of 2 equivalents of an aromatic aldehyde, 2 equivalents of an arylamine and 1 equivalent of ethyl acetoacetate is performed by adopting the target product 6 as a catalyst at 40 DEG C under mild conditions to synthesize an ethyl 4-phenylamino-1-phenyl-1,2,5,6-tetrahydro-2,6-diphenylpyridine-3-carboxylate derivative. The synthesis and the uses are characterized in that: (1) the product 10 is obtained rapidly with a high yield; (2) reaction conditions are mild, operation is simple, reaction time is short, the yield is high and after-treatment is simple and convenient; and (3) the synthesis is green, economical and efficient.
Owner:江西省德兴市百勤异VC钠有限公司

1, 3-di-(1-methylimidazole)-2-propanol tetrafluoroborate ion liquid and preparation method thereof

The invention discloses ion liquid containing symmetrical functional groups, in particular to 1, 3-di-(1-methylimidazole)-2-propanol tetrafluoroborate ion liquid and a preparation method thereof. The 1, 3-di-(1-methylimidazole)-2-propanol tetrafluoroborate ion liquid has a general structure formula as follows. The preparation method of the 1, 3-di-(1-methylimidazole)-2-propanol tetrafluoroborate ion liquid comprises the following steps of: dissolving 1-methylimidazole into 2-3 times of alcohol; adding tetrafluoroboric acid with 0.9-1.1 times of molar weight under ice-water bath stirring at -5-10 DEG C; reacting for 30-90 minutes under the same condition, and then dripping 3-chlorine-propylene oxide with 0.8-1.0 times of molar weight to a reaction bulb; after a drying tube is prepared, placing the reaction bulb in a water bath of an experimental ultrasonic cleaner, and ultrasonically radiating (with the power of 300 W and the frequency of 40 KHz) and reacting for 3-12 hours under the condition of 15-70 DEG C; removing a solvent through rotation, decompression and evaporation; drying for 12 hours in vacuum at 80 DEG C and then obtaining an intermediate compound; then mixing the intermediate compound with the 1-methylimidazole with the molar ratio of 1:1.2-1:2.5; adding absolute alcohol with 2-3 times mount of total amount; then adding the tetrafluoroboric acid with 1.2-1.5 times of molar weight; reacting for 2-8 hours under the stirring condition at -5-10 DEG C; then increasing temperature to 10-60 DEG C, and reacting for 12-24 hours; removing the solvent through the rotation, the decompression and the evaporation; and drying for 12 hours in vacuum at 80 DEG C and then obtaining the pure1, 3-di-(1-methylimidazole)-2-propanol tetrafluoroborate ion liquid.
Owner:QINGDAO UNIV OF SCI & TECH

[ethyl (R)-(+)-beta-(1- methylimidazolyl)-propionate]X chiral ionic liquid and synthesis method thereof

InactiveCN102140082ACarboxylic acid salt preparationSynthesis methods2-bromopropionic acid
The invention discloses a [ethyl (R)-(+)-beta-(1-methylimidazole)-propionate]X chiral ionic liquid and a synthesis method which is used for solving the technical problem that imidazole type chiral ionic liquid prepared by the existing preparation method has high liquid melting point and low yield. The technical scheme is as follows: (S)-(-)-2-chloropropionic acid and (S)-(-)-2-bromopropionic acid are taken as raw materials and undergo esterification reaction with absolute ethyl alcohol to generate stable (S)-(-)-2-chloropropionic acid ethyl ester or (S)-(-)-2-bromopropionic acid ethyl ester; the (S)-(-)-2-chloropropionic acid ethyl ester or (S)-(-)-2-bromopropionic acid ethyl ester undergoes alkylation reaction with N- methylimidazole to generate chlorinated ethyl (R)-(+)-beta-(1-methylimidazole)-propionate or brominated ethyl (R)-(+)-beta-(1- methylimidazole)-propionate chiral ionic liquid; the chlorinated ethyl (R)-(+)-beta-(1- methylimidazole)- ropionate or brominated ethyl (R)-(+)-beta-(1- methylimidazole)-propionat chiral ionic liquid is used as an intermediate to undergo the anion exchange reaction with salts containing anions such as BF4<->, PF6<->, SCN<->, CH3COO<-> so as to obtain the [ethyl (R)-(+)-beta-(1- methylimidazole)-propionate] X chiral ionic liquid. The melting point of the [ethyl (R)-(+)-beta-(1- methylimidazole)-propionate] X chiral ionic liquid is reduced to minus 40 to minus 36 DEG C from 5 to 16 DEG C of the melting point of the background art; the yield of the [ethyl (R)-(+)-beta-(1- methylimidazole)-propionate] X chiral ionic liquid is increased to 52.8 to 60.5% from 20 to 35% of yield of the background art.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
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