92 results about "Ethyl iodide" patented technology

The invention discloses a method for preparing and purifying a water-soluble cyanine dye (Cy5.5), which comprises the following steps of: reacting 1,3-disulfonic acid-6-naphthylhydrazine serving as an initiative raw material with methyl isopropyl ketone to generate 1,1,2-trimethyl-benzindole-1,3-disulphonate; reacting the 1,1,2-trimethyl-benzo-indole-1,3-disulfonate with ethyl iodide and 6-bromocaproic acid respectively to generate N-ethyl-2,3,3-trimethyl-benzindole-5,7-disulphonate (product 1) and N-(epsilon-carboxy-pentyl)-2,3,3-trimethyl-benzindole-5,7-disulphonate (product 2); reacting the product 1 with beta-anilino-acraldehyde-anil-hydrochloride and then directly reacting the product 1 with the product 2 to prepare the Cy5.5; and preparing a thin layer chromatogram, and repeatedly purifying and separating the Cy5.5 to obtain a pure product of the Cy5.5. The method is easy and convenient to operate and has a high yield, the product does not need expensive high performance liquid chromatography (HPLC) (C-18 reverse column) for separation, and the method has great significance for meeting requirements of domestic autonomous production.

The invention discloses a making method of S-1-(4-ethoxy benzyl)-3-aza pantane-1, 5 diamine in the organic synthetic technical domain, which comprises the following steps: 1reacting L-tyrosine alkyl ester protected by amino and ethyl iodide catalyzed by anhydrous carbonate alkali to produce L-tyrosine alkyl ester protected by O-ethyl-amino; 2. reacting L-tyrosine alkyl ester protected by O-ethyl-amino and anhydrous ethanediamine to do ester exchange to produce O-ethyl-L-tyrosinamide protected by N-(2-amino ethyl)-amino; 3. stripping protecting group of amino through trifluoroacetic acid; 4. using aluminium lithium hydroxide to reduce; obtaining the product. The invention reduces technical difficulty with mild reacting condition, which can prepare key intermediate of Gadoxetic acid disodium (Gd-EOB-DTPA).

The invention discloses a method for preparing perfluoroalkyl ethyl alcohol with perfluoroalkyl ethyl iodide, which comprises the following steps: (a) fuming sulphuric acid and the perfluoroalkyl ethyl iodide are mixed at 55-75DEG C, thus obtaining premixed reactants; (b) the premixed reactants are heated to 130DEG C at most to ensure the fuming sulphuric acid to react with the premixed reactants of the perfluoroalkyl ethyl iodide, thus forming sulfate; and (c) hydrolysis is carried out and the perfluoroalkyl ethyl alcohol is separated.

The invention belongs to the technical field of fluorescence spectrum detection and analysis, and particularly relates to a visual organic molecular fluorescence probe on the basis of cyanine and a method for preparing the visual organic molecular fluorescence probe. The visual organic molecular fluorescence probe comprises a cyanine fluorophore and benzothiazole groups. The method includes stepsof (1), dropwise adding phosphoryl chloride into N, N'-dimethylformamide to obtain mixtures, then adding the mixtures into bromoacetic acid and carrying out reaction to obtain products II; (2), carrying out reaction on 2, 3, 3'-trimethyl indole and ethyl iodide to obtain products III; (3), dropwise adding piperidine into the products II and the products III and carrying out reaction to obtain products IV; (4), carrying out reaction on the products IV and aminothiophenol at the room temperature to obtain the visual organic molecular fluorescence probe. The visual organic molecular fluorescenceprobe and the method have the advantages that obvious color change of the visual organic molecular fluorescence probe can be seen in natural light or ultraviolet lamps, linear relations between the fluorescence intensity and peroxynitrite negative ions are established, and accordingly the peroxynitrite negative ions can be qualitatively and quantitatively detected; the visual organic molecular fluorescence probe is good in selectivity and high in sensitivity, detection methods are easy to implement, and obvious effects can be realized.

The invention relates to a method for preparing perfluoro alkyl ethylene. The method comprises the following steps that: in a container provided with a mechanical stirrer, a condenser and a heating system, a solution of organic alkali and perfluoro alkyl ethyl iodide which is more than stoichiometric amount are mixed; the mixing solution is catalyzed by adding a catalyst and then subjected to heating backflow to generate the perfluoro alkyl ethylene; and the solvent and the perfluoro alkyl ethylene with higher purity are separated in modes of normal pressure rectification and pressure reduction rectification respectively. The method has the advantages that: the preparation method is simple, and the reaction is quick; the obtained product is easily separated and high in purity; the solvent can be recycled; and the use equipment is simple, so that the costs on energy and equipment investment are saved.

The invention relates to a preparation method of lubricating oil containing fluorine, comprising the following steps: taking 34-72 parts by weight of perfluoro alkyl iodide or perfluoro alkyl ethyl iodide and 5-13 parts by weight of olefine monomer as main ingredients, adding 0.8-1.5 parts by weight of initiator, and carrying out synthetic reaction at the temperature of 40-120 DEG C for 0.5-4 hours; adding 1-12 parts by weight of catalyst, 30-65 parts by weight of acetic acid and 38-75 parts by weight of alcohol solvent after reaction, and reacting continuously at the temperature of 40-120 DEG C for 1-4 hours; filtering, removing the solvent, washing and dewatering, thus obtaining the fluorine containing lubricating oil. Compared with perfluoropolyether, the invention has the advantages that process is simple, service time is long, cost is reduced by 30%, thermal stability is good, viscosity thereof is slightly changed at the temperature of 220-280 DEG C, mechanical abrasion is reduced by more than 90%, cost performance is high, no pollution is produced, adaptive limit temperature range is wide, the adaptive limit temperate ranges from minus 40 to 280 DEG C, and the lubricating oil containing fluorine has small possibility of oxidation, thus being applicable to inflammable and explosive places, and the obtained fluorine containing lubricating oil can save fuel oil by more than12%, thus achieving obvious energy conservation effect.

The invention discloses a method for carrying out catalytic synthesis on arene 2,2,2-trifluoro-ethyl sulfide through copper. The method includes the steps that copper iodide is adopted as a catalyst, diimine is adopted as a bidentate ligand, arene halogen, powdered sulfur and 2,2,2-trifluoro-ethyl iodide are adopted as reactants, sodium borohydride is adopted as a reducing agent, stirring is conducted for 1-24 hours at the temperature of 80 DEG C to 95 DEG C in an N,N-dimethyl formamide solvent, aftertreatment is conducted on reaction liquid after the reaction is completed, and the arene 2,2,2-trifluoro-ethyl sulfide compound is obtained. The synthesis method has the advantages that the catalyst is low in price, easy to obtain and low in toxicity, the raw materials are easy to obtain, operation is easy and convenient, and the universality of functional groups is good.

The invention relates to a fiber material folding iodine adsorber comprising an adsorber housing; an air inlet and an air outlet are respectively formed in two sides of the adsorber shell; a fiber material folding type filter element is arranged in an inner cavity of the adsorber shell; the fiber material folding type filter element comprises an adsorption layer formed by overlapping a plurality of layers of fiber material filter paper; filter paper is folded into a snake-bellied shape, two ends of the filter paper are bonded and sealed by a resin glue, and the adsorption layer is reinforced and supported by a supporting plate. During use, gas enters from the air inlet and penetrates through the adsorption layer, radioactive iodine in the gas is adsorbed through the adsorption layer, and the adsorbed and purified gas flows out from the air outlet. The adsorption layer is made of a porous carbon fiber filter paper material, the adsorption layer is soaked in a solution formed by triethylene diamine or potassium iodide alone or in a mixed mode according to a certain proportion, the adsorption layer has the capacity of adsorbing radioactive iodine (elemental iodine, inorganic iodide, methyl iodide, ethyl iodide and the like), and the porous carbon fiber filter paper material is light in weight and facilitates waste treatment.

The invention discloses an environment-friendly preparation process for synthesizing perfluoroalkyl alcohol by a solvent method. The environment-friendly preparation process comprises the following steps: adding perfluoroalkyl ethyl iodide, a mixed solvent and water in a stirring reaction kettle, wherein the molar ratio of the water and the perfluoroalkyl ethyl iodide is 4-10:1, and the weight ratio of the mixed solvent and the perfluoroalkyl ethyl iodide is 3-10:1; in the temperature of 140-160 DEG C, reacting for 10-20 hours under the normal pressure backflow state; and washing layering, rectifying, and dehydrating the reaction liquid, and obtaining a product. After the end of the reaction, the gas phase detection analysis is performed to the product, the percent conversion of the perfluoroalkyl ethyl iodide is more than 98%, the selectivity of the perfluoroalkyl alcohol is more than 95%, and the yield of the perfluoroalkyl alcohol is more than 90%. The environment-friendly preparation process has the advantages of small device investment cost, simple process, low cost, safety and environment friendliness.

A process for producing high purity acetic acid from a carbonylation reaction, wherein the carbonylation reaction is carried out while maintaining a low ethyl iodide content in the reaction medium. The ethyl iodide concentration may be maintained by removing acetaldehyde from the reaction medium and/or by adjusting at least one A) hydrogen partial pressure in the reactor, B) methyl acetate concentration of the reaction medium; and/or C) methyl iodide concentration of the reaction medium.

The invention relates to a method for measuring ethoxy content of ethyl cellulose by using headspace gas chromatography. The measuring method comprises the following steps of: hydrolyzing the ethyl cellulose by hydroiodic acid in the presence of an adipic acid catalyst under high-temperature closed conditions, wherein the ethoxy of the ethyl cellulose is converted into iodoethane, o-xylene is used as an absorbent, and the hydrolysis reaction of the ethyl cellulose is complete due to the actions of the catalyst and the absorbent; selecting toluene as internal standard solution, selecting the iodoethane as standard sample solution, performing headspace sampling, and performing gas chromatography; and calculating the ethoxy content of the sample according to the peak areas of the internal standard solution and the standard sample solution. The method is superior to a common chemical titration method, and has the characteristics of short analysis time, simple operation, high accuracy and the like.

The invention relates to an asymmetric squarylium cyanine colorimetric probe for identifying copper ions and application of the asymmetric squarylium cyanine colorimetric probe, and a preparation method of the asymmetric squarylium cyanine colorimetric probe comprises the following steps: synthesizing 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole from 1, 1, 2-trimethyl-1H-benzo [e] indole and iodoethane, synthesizing diethoxy squaric acid from squaric acid and ethanol, and synthesizing diethoxy squaric acid from 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole and 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole. The preparation method comprises the following steps: synthesizing 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole squaric acid hemicyanine from 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole, and synthesizing asymmetric double-square acid cyanine from the 3-ethyl-1, 1, 2-trimethyl-1H-benzo [e] indole squaric acid hemicyanine and 3-diethylaminophenol for selective recognition and detection of copper ions. The asymmetric squarylium cyanine chemical sensor has the beneficial effects that the asymmetric squarylium cyanine chemical sensor has the characteristics of good optical performance and high sensitivity. When the copper ions are detected and identified, the color of the solution is obviously changed, so that colorimetric detection is facilitated.