100 results about "18-Crown-6" patented technology

The present invention relates to method of purifying and detecting metal ion in dimetyl sulfoxide as the solution for polymerizing polyactylonitrile carbon fiber. The metal impurities are eliminated from dimetyl sulfoxide based on static adsorption and exchange principle, and the elimination includes eliminating iron ion from dimetyl sulfoxide with macroporous weak alkali type anion exchange resin and eliminating calcium, magnesium, sodium and potassium ions from dimetyl sulfoxide with macroporous strong base type cation exchange resin. The detection includes ultraviolet spectrophotometry to detect the concentrations of various metal ions in the organic solvent, o-phenanthroline colorimetry to detect iron ion content, chloroposphonazo I colorimetry to detect calcium and magnesium ion content, and 18-crown-6 synergistic extraction process to detect potassium ion content.

The invention relates to a process for continuously producing extra high purity nitric acid, which comprises the following steps: first, industrial grade 80-90% nitric acid raw material and double allyl 18-crown-6 ether organosilicon macromolecular complexing agent accounting for 0.2-2% of the weight of nitric acid raw material are mixed in a pretreater, then, the mixture is filtered by a micro-filtration membrane under a working pressure of 0.1-0.2 Mpa, the filtrate enters a rectification tower, and the semi-finished product going through the rectification tower is diluted by ultra pure water in a dilution device; after the dilution is finished, the dissociative NO2 is expelled by high pure nitrogen in a whitening device, and the obtained finished product is filtered by a nanometer filter membrane and enters a finished product receiver under the working pressure of 0.5-0.8 Mpa; wherein, the aperture of the micro filtration membrane is 0.2 to 0.8 Mu m, and the aperture of the nanometer filter membrane is 0.5 to 1.5 nm. In the prepared ultra high purity nitric acid, the content of single cation is lower than 1 ppb, the content of single anion is lower than 100 ppb, and the content of the dust particle larger than 0.5 Mu m is lower than 5 per milliliter. The production process for extra high purity nitric acid has the advantages of simple technique, low production costs, high purity of products, low content of impurity ions, and applicability for large-scale mass production.

The invention provides a preparation method of 1-(2,2-difluoroethoxy)-6-trifluoromethyl-N-([1,2,4]triazolezol[1,5-C]pyrimidine-2-)benzsulfamide, comprising the following steps: using a compound represented by formula (IV) as an initial raw material to synthesize a compound represented by formula (III); synthesizing the compound represented by formula (II); finally synthesizing a target compound represented by formula (I). In the invention, two phenolic alcohols are jointed to form ether, thereby preventing from using costly non-marketization 2,2-difluorobromoethane for introducing difluoroethoxy as a reagent; in the process of synthesizing target product, besides 3,5-dimethyl pyridine and dimethyl sulfoxide, a catalytic amount of 18-crown-6 crown ether is used to improve the reaction timeand reaction yield. The invention simplifies the reaction conditions, optimizes the synthesis process, enhances the reaction yield, and reduces production cost, thereby greatly improving the synthesis effect. The reaction formula is represented as follows.

The invention discloses application of benzo-azacrown ether compounds to separation of lithium isotopes. The benzo-azacrown ether compounds are selected from monoaza15-crown-5, bisaza15-crown-5, triaza15-crown-5 and bisaza18-crown-6. The benzo-azacrown ether compounds serving as extracting agents are dissolved in organic solvents to prepare organic phases, a lithium trifluoroacetate aqueous solution serves as an aqueous phase, and the lithium isotopes are separated at the room temperature by liquid-liquid extraction. The benzo-azacrown ether compounds are easy to dissolve in the organic solvents, efficient separation of the lithium isotopes can be realized by means of liquid-liquid extraction, and considerable separation factors, simplicity and convenience in operation, quickness in isotope exchange and technical simplicity are realized.

The invention discloses a photosensitive chiral macrocyclic molecule and a preparation method and application thereof, belonging to the field of preparation of photoresponsive materials. The preparation method for the photosensitive chiral macrocyclic molecule adopts the following steps: a) reacting oligomeric ethylene glycol, sodium hydroxide and p-toluenesulfonyl chloride in a tetrahydrofuran solvent in an inert atmosphere so as to obtain an intermediate 1; b) dissolving the intermediate 1, cesium carbonate and dibenzo-18-crown-6 in an N-N dimethylformamide solvent and carrying out a reaction in an inert atmosphere so as to obtain an intermediate 2; and c) dissolving the intermediate 2, chiral binaphthol compounds, cesium carbonate and dibenzo-18-crown-6 in the N-N dimethylformamide solvent and carrying out a reaction in an inert atmosphere so as to obtain a target product. The photosensitive chiral macrocyclic molecule provided by the invention has the advantages of easy synthesis, good stability, ability of selective complexation of chiral ammonium salt and capability of realizing complexation and release of chiral ammonium salt through an azo cis-trans isomerization behavior.

The invention discloses a method for preparing super-pure nitric acid. The method comprises the following steps: taking industrial nitric acid as a raw material; performing first stage filtration by a membrane filter consisting of dibenzo-18-crown-6 and solid-phase carrier composite membrane; performing second stage serial continuous rectification on the filtrate; collecting heavy waste acid and light waste acid respectively; and performing second stage filtration with the membrane filter to obtain the super-pure nitric acid serving as the target product. Upon analysis and detection, the content of each metal ion impurity is less than 1ppb, the dust particles bigger than 0.5microns are less than 5/ml and the SEMI C8 standard is met. By performing the second stage filtration with the membrane filter consisting of the dibenzo-18-crown-6 and the solid-phase carrier composite membrane, the method overcomes the disadvantage of instable quality of the product in an existing method; the method effectively improves the purity of the super-pure nitric acid product by using the second stage serial continuous rectification technology; and the super-pure nitric acid product obtained by the method has stable quality and high purity and is suitable for scale continuous production.

The invention provides a potassium ion fluorescence probe as well as a preparation method and application thereof. The potassium ion fluorescence probe utilizing phenylazepin-18-crown-6-amine as a recognition group and a hemicyanine dye group as a fluorescence group has the advantages of environmental sensitivity, good water solubility, high detection accuracy and high response speed to concentration change of potassium ions, is a colorimetric and instant rate type potassium ion detection probe and can be prepared into detection test paper, and the content of the potassium ions can be rapidly detected according to the color change of the test paper; and the potassium ion fluorescence probe is hopeful to be used for detecting the concentration of the potassium ions in traditional Chinese medicine injections and red wine, human urine or blood and has wide application prospects.

The invention relates to a synthesis method of dicyclohexyl-18-crown-6 (DCH18C6), belonging to the technical field of preparation of an organic compound. The invention aims at increasing the content of cis-DCH18C6 isomer in the reaction product, thereby simplifying the purification process and improving the yield of cis-isomer. In the synthesis method, dibenzo-18-crown-6 is used as a raw material, and nano ruthenium metal powder is used as a catalyst to perform a catalytic hydrogenation reaction, wherein the reaction temperature is 100-200 DEG C, and the hydrogen pressure is 2-10 MPa. Although the method does not include any purification step, the content of the cis-isomer in the product can be up to 80% or above. The synthesis method has the characteristics of low cost and strong practicability and can be operated simply and conveniently.

A method of fluorinating an organic compound comprising reacting an organic compound with a fluorinating agent characterized in that a perfluorocarbon compound is present in the reaction medium. The perfluorocarbon compound may replace an amount of a solvent which would otherwise be required for the reaction to proceed efficiently. The perfluorocarbon compound is readily recoverable after reaction and may be re-used in subsequent reactions. Additives to the reaction medium, such as 18-crown-6, may increase the amoun of solvent which may be replaced. The method is beneficial where solvent consumption would otherwise be large, or where solvent recovery would otherwise be difficult.

The invention discloses a synthesis method of low-polyethylene-glycol functional amphiphilic pillar [5] arene compound (AP5-glycol), wherein AP5-glycol is self-assembled in water to form a vesicle, and the vesicle can generate responsive depolymerization (the vesicle becomes small or gradually disappears) after being affected by external physical stimulation such as heating, ultrasonic treatment, violent stirring and the like and can be rapidly formed again after the external stimulation is stopped, i.e., the two processes including vesicle formation and vesicle depolymerization are reversible and controllable. Therefore, the vesicle has excellent thermodynamic reversibility and controllability. In addition, KPF6 and benzo-18-crown-6 can be respectively used as a switch for depolymerizing and forming a vesicle self-assembly again. The characteristics can ensure that the vesicle has outstanding recyclability in application such as drug release or transfer and the like.

The invention relates to a caustic alkali for printing and dyeing, characterized in that it comprises 10%-20% by wt of disodium hydrogen phosphate, 15%-30% by wt of sodium hydroxide, 5%-18% by wt of sodium carbonate, 1%-10% by wt of potassium carbonate, 0.1%-2% by wt of organic ene acid, 1.6%-16% by wt of organic phosphonic acid, 0.01%-5% by wt of organic carboxylic acid, 0.01%-2% by wt of crown ether and water. The manufacturing method for said caustic alkali for printing and dyeing contains that organic phosphonic acid, organic carboxylic acid, organic ene acid and water are poured into the reaction vessel and mixed evenly; the temperature is increased to 120-140DEG C gradually; K+18-crown-6 crown ether is dropped into it, the mixture is mixed round and the temperature is decreased to normal temperature; then sodium hydroxide is added into it and the temperature is increased to 120-140DEG C; after that sodium carbonate is added into it and the temperature is maintained to air discharging; finally disodium hydrogen phosphate is added into and the temperature is maintained for 6-8 hours.

The present invention provides a method for producing of ultra-clean and high-purity N-methyl pyrrolidone through using industrial grade N-methyl pyrrolidone as raw material. After the pretreatment, sorption and dehydration with 4A molecular sieve, twice membrane filtrations are carried out through using β-cyclodextrin composite membrane for the first and 18-crown-6 composite membrane for the second. The filtrate is rectified under vacuum and filtered through using complexant composite microporous membrane to obtain the product. The ultra-clean and high-purity N-methyl pyrrolidone, produced by the method provided by the present invention, is up to the SEMI C8 standard. And the purity of the product is over 99.8%, the moisture content is less than 0.03%, and the content of single metal ion is less than 1 ppb. Comparing to the prior art, the present invention has the advantage such as the stable quality of the product, simple operation, and is suitable for industrial continuous production.

The invention provides a preparation method of an organic/layered double hydroxide (LDH) complex. The preparation method comprises the following steps of a) dissolving 1,10-dioxo-4,7,13, 16-tetranitro-18-crown-6 in a CH2Cl2 solvent, adding anhydrous potassium carbonate into the solution and mixing them, heating and refluxing the mixed solution, then adding ethyl bromoacetate into the mixed solution and refluxing it, then filtering and evaporating the refluxed solution to obtain an oil-like substance, adding hydrochloric acid solution into the oil-like substance, heating, refluxing and filtering the mixed solution, and evaporating the filtrate to make crystals be separated out to obtain 4,7,13,16-tetracarboxymethyl-1,10-dioxo-4,7,13, 16-tetraazaoctadecane (TECA), and b) mixing TECA, NaOH and methanamide, adding MgAl-NO3-LDH into the mixture, standing for 10 minutes to 16 hours, and then centrifuging, washing and drying the mixture to obtain a TECA/LDH complex, wherein a mass ratio of TECA to MgAl-NO3-LDH is 1. Through the preparation method, a TECA/LDH complex can be prepared in a short reaction time thus a production period of the TECA/LDH complex is saved; corrosive effects of methanamide on LDH laminates are reduced and compositions of the laminates are maintained well; and a crystallinity and a yield of complex products are improved.

The invention relates to a preparation method of 2,2,2-trifluoroethyl-1,1,2,3,3,3-hexafluoroisopropyl ether. Trifluoroethanol reacts with hexafluoropropylene in an organic polar solvent and in the presence of potassium fluoride and phase-transfer catalyst, at the temperature of room temperature to 50 DEG C, so as to produce 2,2,2- trifluoroethyl-1,1,2,3,3,3-hexafluoroisopropyl ether, and the phase-transfer catalyst is 18-crown-6, tetrabutylammonium chloride or trimethylphenylammonium. The preparation method of 2,2,2- trifluoroethyl-1,1,2,3,3,3-hexafluoroisopropyl ether has the advantages of mild reaction conditions, normal pressure reaction, low catalyst price, convenient post-treatment, and good yield and selectivity, and is suitable for industrial production.

The invention discloses an electrochemical sensor and a potassium ion detection method thereof, and belongs to the field of analysis and detection. A preparation method for a work electrode of the electrochemical sensor comprises that 1-aza-18-crown-6 functionalized oxidized graphene (Crown-GO) is dispersed in an aqueous solution by supersonics to obtain a Crown-GO suspension; and the Crown-GO suspension is uniformly dropped on the surface of a glassy carbon electrode after polishing, cleaning and blowing-dry to obtain Crown-GO/GCE. It is shown, by electrochemical performance test, the prepared glassy carbon electrode modified by the Crown-GO composite material can be used to detect potassium ions highly sensitively with low detection limit and wide detection range; and the prepared electrochemical sensor has the advantages of being simple in the electrode material preparation process, friendly to the environment, simple in operation and high in sensitivity, and can be widely applied in the potassium ion detection field.