43 results about "Hexafluorobenzene" patented technology

An oxide etching process, particularly useful for selectively etching oxide over a feature having a non-oxide composition, such as silicon nitride and especially when that feature has a corner that is prone to faceting during the oxide etch. The invention uses a heavy perfluorocarbon, for example, hexafluorobutadiene (C₄F₆) or hexafluorobenzene (C₆F₆). The fluorocarbon together with a substantial amount of a noble gas such as argon is excited into a high-density plasma in a reactor which inductively couples plasma source power into the chamber and RF biases the pedestal electrode supporting the wafer. A more strongly polymerizing fluorocarbon such as difluoromethane (CH₂F₂) is added in the over etch to protect the nitride corner. Oxygen or nitrogen may be added to counteract the polymerization. The same chemistry can be used in a magnetically enhanced reactive ion etcher (MERIE) or with a remote plasma source.

An electrochemical energy storage device includes a negative electrode which contains a carbon material and has a negative electrode potential of 1.4 V or less relative to a lithium reference when being charged, and a non-aqueous electrolyte solution prepared by dissolving a lithium salt, an ammonium salt, and at least one kind of fluorinated benzene selected among hexafluorobenzene, pentafluorobenzene, 1,2,3,4-tetrafluorobenzene, 1,2,3,5-tetrafluorobenzene, 1,2,4,5-tetrafluorobenzene and 1,2,3-trifluorobenzene, in a non-aqueous solvent.

The invention relates to a preparation method for pentafluorophenol. By taking hexafluorobenzene as an initial raw material, pentafluorophenol is prepared through etherification reaction and cracking reaction or by taking hexafluorobenzene as the initial raw material, pentafluorophenol is prepared by virtue of a one-step method. The preparation method provided by the invention does not need high temperature and pressurization, is less in energy consumption, and does not use expensive hydroiodic acid, so that the cost of the raw materials is low. Moreover, wastewater generated by etherification reaction is less, so that the preparation method is environmental-friendly; Cracking is carried out in a solvent, the material stirring effect is good, the reaction temperature is easy to control, and industrialization is easy to implement.

The invention relates to an aluminum alloy smelting refining agent. The aluminum alloy smelting refining agent consists of the following components by weight percent: 40-70% of potassium chloride, 15-30% of sodium aluminum fluoride, 1-10% of hexafluorobenzene, 5-15% of calcium sulphide and 5-20% of sodium sulfate. By adopting the aluminum alloy smelting refining agent, the hydrogen removing ability is enhanced, the content of hydrogen is reduced to 0.12ml/gAL, the impurity removing effect is obvious, after the refining agent is added, the refining production process is simple, and the utilization rate of the refining agent is improved.

The invention discloses an aluminum alloy refining agent which comprises the following raw materials in parts by mass: 20-25 parts of potassium chloride, 30-35 parts of sodium chloride, 3-5 parts of sodium carbonate, 3-6 parts of calcium fluoride, 10-15 parts of sodium sulfate, 20-25 parts of potassium nitrate, 5-10 parts of hexafluorobenzene and 1-2 parts of rare earth. The aluminum alloy refining agent can effectively remove slag inclusions in the liquid aluminum, can lower the hydrogen content in the liquid aluminum, and has obvious purifying effect on the liquid aluminum.

The invention discloses a preparation method of hexafluorobenzene and chloropentafluorobenzene. The preparation method of hexafluorobenzene and chloropentafluorobenzene comprises the following steps of: (1) adding raw materials including hexafluorobenzene, active potassium fluoride and a catalyst into a reactor; (2) carrying out nitrogen displacement on the reactor and adding a solvent into the reactor; (3) heating the reactor and stopping heating after a reaction completes; (4) after cooling, switching on an air valve of the reactor, evaporating a reaction product and the solvent in the reactor, and condensing and recycling the reaction product and the solvent; (5) deacidifying the reaction product and the solvent condensed and recycled in the step (4) through an acid separator; (6) separating hexafluorobenzene and chloropentafluorobenzene from the deacidified reaction product and solvent in the step (5) through a rectifying method; and (7) after the reaction product and the solvent in the reactor are completely recycled, cooling the reactor, opening a reaction kettle, and taking out residues such as potassium chloride in the reaction kettle. The preparation method of hexafluorobenzene and chloropentafluorobenzene has the characteristics of convenience for process operation, mildness in reaction, safety and controllability, simplicity in post treatment procedure, less loss and high yield.

The invention provides a method of producing hexafluorobenzene from byproduct wastes of tetrachloroethylene. The method includes the steps of: preparing an ionic liquid solvent; adding the byproduct wastes of tetrachloroethylene, dried KF, the ionic liquid solvent, and a polystyrene supporting quaternary phosphonium salt type resin catalyst into a reaction kettle; and gradually increasing the temperature of the system to perform a reaction, thus producing the products, including hexafluorobenzene and monochloropentafluorobenzene.

The invention discloses an environment-friendly treatment method of hexachlorobenzene. The method comprises the following steps: (1) putting hexachlorobenzene and an active potassium fluoride solution organic solvent into a single reactor; (2) performing pressure test leakage detection and nitrogen replacement on the single reactor containing a reaction solution; (3) heating the single reactor to 200-300 DEG C, boosting the pressure to 2.0-3.0MPa, and reacting for 10-15h at a reaction temperature and a reaction pressure; (4) distilling off reactants in the single reactor, condensing and then collecting the reactants; (5) performing distillation separation on hexachlorobenzene and chloropentafluorobenzene in the reactants; and (6) performing reduced pressure distillation to collect fluorochlorobenzene (byproduct) and the organic solvent in the single reactor, taking out potassium chloride residues in the single reactor, drying fluorochlorobenzene, and then adding fluorochlorobenzene into the single reactor for continuous use. The method disclosed by the invention is mild in reaction condition and relatively high in conversion rate and yield, and a practical chemical intermediate is obtained while pollution is reduced, so that the method has a broad application prospect.

The invention discloses a method for detecting impurities in lithium hexafluorophosphate. The method includes steps of (1), carrying out calibration, to be more specific, adding deuterated reagent solution of hexafluorobenzene and deuterated reagent solution of the lithium hexafluorophosphate into inner and outer tubes of coaxial nuclear magnetic tubes, carrying out fluorine spectrum detection, adding deuterated reagent solution of phosphoric acid and deuterated reagent solution of the lithium hexafluorophosphate into the inner and outer tubes of the coaxial nuclear magnetic tubes and carrying out phosphorus spectrum detection; (2), carrying out measurement, to be more specific, preparing to-be-detected samples with certain concentration from the lithium hexafluorophosphate and deuterated reagents and carrying out fluorine spectrum and phosphorus spectrum detection by the aid of nuclear magnetic resonators. Compared with the traditional method, the method has the advantages that the fluorine-containing and phosphorus-containing impurities in the lithium hexafluorophosphate can be qualitatively and quantitatively detected by the aid of the method, and the method is short in analysis time, easy to implement and high in sensitivity, equipment can be prevented from being damaged by fluorine-containing strong corrosive substances, and the like.

The invention relates to a preparation method of pentafluorophenol, and belongs to the field of chemical production technologiesprocesses. The preparation method of the pentafluorophenol is carried out according to the following technologies processes that hexafluorobenzene, strong base and water are put in a sealed container, to be prepared intothus a mixed solution is prepared, heat preservationis conducted at the temperature of 100-150 DEG C for reaction, and thus a system solution is obtained; the system solution is neutralized until the pH value is not higher than 6, then a coarse product is extracted, rectification is conducted, and the pentafluorophenol is obtained. According to the preparation method, the cost is low, organic matter and heavy metal are not adopted except for substrate, pollution is small, side reactions is are lessfewer, the reaction steps are simple, and operation is easy.

The invention provides a pentafluorophenol preparation method, which comprises: using hexafluorobenzene and potassium hydroxide as raw materials, adding an appropriate amount of tetrabutylammonium hydrogen sulfate, N-sulfopropyl-3-methylpyridine triflate, N-methyl-2-[(2-methylphenoxy)acetyl]hydrazinium methylthioamide and 2,2,6,6-tetramethylpiperidine-oxynitride to a tert-butyl alcohol aqueous solution with a mass fraction of 80-85%, heating to achieve a slight boiling state, carrying out a reflux reaction for 2-3 h, adding an appropriate amount of water, distilling to recover the tert-butyl alcohol solvent, adjusting the PH value of the remaining aqueous solution by using refined hydrochloric acid to 9-10, adsorbing with a functionalized D101 macroporous adsorption resin, acidifying with refined hydrochloric acid to achieve the PH value of 1-2, layering, distilling the upper layer water phase until no oily substance exists, collecting the distilled product, combining the collected product and the lower layer oil phase, rectifying, collecting the distillate at the temperature of 142-144 DEG C, and cooling to a room temperature to obtain the colorless and transparent crystal pentafluorophenol. According to the present invention, the preparation method has advantages of simple and reasonable process, less side reactions, high reaction yield and high product purity, and can meet the quality requirements for the preparation of the high-quality liquid crystal materials and drugs.

A preparation method of hexafluorobenzene comprises the following steps: dehumidifying, dedusting and purifying a reactor; adding a hexachlorobenzene solid into the reactor filled with a solvent, mixing uniformly, and sealing the reactor; vacuumizing the sealed reactor for replacement, and completely discharging air in a container; cooling the reactor, controlling the temperature in the reactor tobe not more than -10 DEG C, and then stirring the solvent added with the hexachlorobenzene solid to completely dissolve the hexachlorobenzene solid; introducing fluorine gas into the reactor in a slow bubbling manner, controlling the gas inflow of the fluorine gas, controlling the temperature in the reaction container to be not more than -10 DEG C, and controlling the reaction pressure in the reaction container to be 0-1MPa; and obtaining a hexafluorobenzene mother liquor after the reaction is finished, and purifying the hexafluorobenzene mother liquor to obtain the hexafluorobenzene product.The method has the advantages of simple reaction conditions, low raw material cost, mild and easily-controlled reaction, low operation requirements and high product yield.

The invention relates to a method for continuously preparing pentafluorophenol by a microreactor, which belongs to the field of chemical production processes. The method comprises the following steps:simultaneously pumping hexafluorobenzene and an inorganic alkali aqueous solution into a micro-channel reactor by using a metering pump respectively, and mixing for a hydrolysis reaction; keeping thetemperature of the reactor at 130-170 DEG C, controlling and maintaining the pressure of a pipeline at 0.5-1.0 Mpa by an outlet quantitative pressure control valve, connecting an outlet with a heat exchanger, obtaining an aqueous solution of pentafluorophenolate from the outlet of the heat exchanger, adding hydrochloric acid steam, distilling to obtain an oil layer, and rectifying and dehydratingthe oil layer to obtain pentafluorophenol. The method is simple in process, low in cost, free of amplification effect and capable of achieving continuous production.

The invention discloses an aluminum rare earth alloy. The aluminum rare earth alloy comprises, by weight, 150-152 parts of aluminum, 18-20 parts of iron, 2-4 parts of cobalt, 5-7 parts of molybdenum, 5-7 parts of zirconium, 1-3 parts of tin, 1-3 parts of iridium, 1-3 parts of terbium, 1-3 parts of dysprosium, 1-3 parts of thulium, 1-3 parts of ytterbium, 2-4 parts of potassium nitrate, 1-3 parts of sodium fluoroaluminate, 1-3 parts of hexafluorobenzene, 1-3 parts of titanium sponge and 6-8 parts of chromium sesquioxide. The aluminum rare earth alloy is high in hardness.

The invention relates to a method for preparing a fluorinated aryl or heteroaryl substrate by combining a quaternary ammonium cyanide and an aryl or heteroaryl substrate substituted with at least one chloro, bromo, sulfonyl, or nitro group to thereby provide a mixture, and combining the mixture with hexafluorobenzene to thereby provide the fluorinated substrate.

The invention discloses a titanium-aluminum-chromium alloy fishhook. The titanium-aluminum-chromium alloy fishhook comprises, by weight, 98-100 parts of titanium, 55-57 parts of aluminum, 48-50 parts of chromium, 4-6 parts of magnesium, 1-3 parts of terbium, 1-3 parts of dysprosium, 4-6 parts of holmium, 1-3 parts of thulium, 1-3 parts of ytterbium, 1-3 parts of lutetium, 2-4 parts of silicon, 6-8 parts of zirconium, 1-3 parts of calcium fluoride, 2-4 parts of sodium aluminum fluoride, 3-5 parts of potassium nitrate, 1-3 parts of hexafluorobenzene, 5-7 parts of molybdenum carbide, 6-8 parts of tungsten carbide and 1-3 parts of boron carbide. The hardness of the titanium-aluminum-chromium alloy fishhook is high.

The invention discloses a production method of a refining agent for secondary refining of hardened and tempered steel. The refining agent is prepared from, by weight, 15-20 parts of potassium chloride, 5-8 parts of sodium carbonate, 12-18 parts of sodium sulfate, 5-10 parts of hexafluorobenzene, 20-30 parts of calcium oxide, 8-10 parts of calcium fluoride, 5-8 parts of barium chloride, 5-8 parts of magnesium chloride, 10-15 parts of waste aluminum powder, 5-10 parts of magnesium oxide, 3-5 parts of rare earth, 5-8 parts of bauxite, 5-8 parts of diatom ooze, 10-15 parts of bentonite and 6-8 parts of pyrophyllite. Compared with the prior art, the refining agent is good in chemical stability, desulfurization and dephosphorization effects and slagging performance, strong in degassing and impurity removal capacity and capable of significantly improving the mechanical property and corrosion resistance of the hardened and tempered steel; meanwhile, the processes of simple mechanical crushing, mixing and pelleting are adopted, the preparation technology is simple, and the cost is low.