71 results about "Hexafluoroacetone" patented technology

A continuous process for producing hexafluoroisopropanol is provided which comprises contacting hexafluoroacetone with hexafluoroisopropanol and hydrogen to produce a liquid feed stream; introducing the liquid feed stream to a reactor containing an immobilized hydrogenation catalyst to convert the hexafluoroacetone to hexafluoroisopropanol and provide a product stream; and recovering at least a portion of the hexafluoroisopropanol from the product stream. Preferably a portion of the product stream is recycled. The reactor can be a packed bed or stirred tank reactor.

An analytical technique for the accurate and precise measurement of trace water in chemical reagents, comprising the steps of combining a chemical reagent comprising ≦5 ppm water, with hexafluoroacetone (HFA), to form a sample mixture comprising at least the chemical reagent and a water derivative of hexafluoroacetone; and measuring the concentration of the water derivative of hexafluoroacetone by gas chromatography.

The invention discloses a hydrogenation catalyst and a preparation method thereof. The preparation method of the catalyst comprises the following steps: (1) first, preparing a gamma-Al2O3 carrier; (2)loading the gamma-Al2O3 carrier by a Co metal component and a F-containing assistant component, and performing drying and roasting; and (3) performing impregnation on the carrier obtained in the step(2) by adopting a solution containing a Ni-containing compound and a W-containing and / or Mo-containing compound, and performing drying and roasting to obtain the catalyst. The catalyst is prepared byloading the gamma-Al2O3 with active components of Co, Ni and W / Mo, and simultaneously the F-containing compound is used as an auxiliary agent, wherein the F-containing compound is at least one selected from a group consisting of tetrabutylammonium fluoride, trifluoroacetic acid, hexafluoroacetone and hexafluoroisopropanol. The catalyst can be used for hydrofining of light distillate oil such as gasoline fraction, kerosene fraction and diesel fraction, has high hydrogenation desulfurization activity and aromatic saturation activity.

The invention discloses a method for detecting hydrogen by a palladium nanoparticle discrete film. The method comprises the following steps that: palladium hexafluoroacetone (II), formalin, a quartz glass substrate, high-purity nitrogen and a carbon-supporting film are firstly prepared; under a vacuum environment, palladium hexafluoroacetone (II) is introduced into a reaction chamber as a precursor, and chemical absorption and chemical reaction are generated by the precursor of palladium hexafluoroacetone (II) and the surface of the quartz glass substrate; the formalin as a precursor generateschemical reaction with palladium hexafluoroacetone (II) as the precursor combined with the substrate. The method disclosed by the invention has the beneficial effects that the response rate of a sensing film to the hydrogen can be effectively increased, the phase change phenomenon caused by pure palladium in the high-concentration hydrogen can be effectively avoided, the accuracy of detection canbe ensured, and the problems that a palladium-yttrium alloy film in the existing optical-fiber hydrogen sensor is easily poisoned by oxygen in the air to cause foaming and cracking and the like of the film to further cause zero drift and influence the accuracy of hydrogen detection are solved.

An analytical technique for the accurate and precise measurement of trace water in chemical reagents, comprising the steps of combining a chemical reagent comprising ≦5 ppm water, with hexafluoroacetone (HFA), to form a sample mixture comprising at least the chemical reagent and a water derivative of hexafluoroacetone; and measuring the concentration of the water derivative of hexafluoroacetone by gas chromatography.

The invention relates to a biological mineralization method of tussah silk fibroin for promoting cell growth. No existing biological mineralization method capable of preparing the tussah silk fibroin with high biocompatibility is easy to operate and quick. The method sequentially comprises the following steps: pulverizing tussah cocoon, and adding into a Na2CO3 water solution for degumming, thereby obtaining the tussah silk fibroin fiber; adding the tussah silk fibroin fiber into an LiSCN water solution, dissolving, dialyzing, freezing, drying to obtain tussah silk fibroin powder, and dissolving the tussah silk fibroin powder in hexafluoroacetone to obtain a tussah silk fibroin solution; dropwisely adding the tussah silk fibroin solution onto a plastic board, and drying in air to obtain a tussah silk fibroin film; and impregnating the tussah silk fibroin film in a CaCl2 water solution, cleaning with water and acetone, drying in air, and impregnating in an Na2HPO4 water solution, cleaning with water and acetone, drying in air, and repeating the operation 20-35 times, thereby obtaining the finished product. The invention has the advantages of simple technique and short preparation period; and the prepared biological material does not have cytotoxicity.

The invention discloses a method for improving mechanical properties of a silk protein membrane by virtue of biological mineralization. The method is realized by the following steps of dissolving an aqueous solution of silk protein or silk protein powder in organic solvents such as hexafluoroacetone, hexafluoroisopropanol and formic acid to obtain a silk protein solution, then dropwises adding the aqueous solution of silk protein or the silk protein solution to a plastic plate and drying to obtain the silk protein membrane. By adopting the method disclosed by the invention. The mechanical properties of the silk protein membrane are significantly improved and the time is greatly saved and the method has the advantages of short production period, simple and efficient extraction process and no complicated and tedious mineralization process and is simple to operate.

The invention discloses a method for preparing hexafluoroacetone by taking perfluoropropylene oxide as a raw material. The method comprises the following steps: adding the perfluoropropylene oxide, acatalyst and water into a reaction kettle according to a weight ratio of 1: (0.1-0.5): (1-5), carrying out isomerization reaction at 10-80 DEG C for 1-5 hours, and distilling and purifying to obtain the hexafluoroacetone, wherein by condensing substituted phenol and Merrifield resin, and mixing and compounding with a carrier, the catalyst is obtained. According to the method, the Merrifield resinloaded substituted phenol is used as the catalyst for the first time, and is applied to the method for preparing the hexafluoroacetone by taking the perfluoropropylene oxide as the raw material, so that a new preparation thought is provided, and particularly for fluorine chemical enterprises, self-produced intermediate products can be fully utilized. The raw materials of the catalyst are easy to obtain, the cost is low, and the economic benefit is good; the catalyst is simple in preparation process and mild in preparation condition. The yield of the hexafluoroacetone reaches 95% or above, theoperation is safe, and the catalyst can be continuously used.

The invention provides a method for preparing hexafluoroacetone by perfluoroisobutylene or alcohol absorption liquid of the perfluoroisobutylene. The method sequentially comprises the following steps: firstly, in a reaction medium, the alcohol absorption liquid of the perfluoroisobutylene is reacted with tertiary amines to form middle stable state tetraalkylammonium salt of alcohol hexafluoroisobutene; secondly, nitrite of alkali metal or alkaline earth metal is dispersed in the reaction medium; thirdly, the obtained middle stable state tetraalkylammonium salt of the alcohol hexafluoroisobutene is mixed with dispersion liquid of the nitrite of the alkali metal or the alkaline earth metal to react to form oxime hexafluoroacetone; and fourthly, the oxime hexafluoroacetone is reacted with inorganic acid to form the hexafluoroacetone.