736 results about "Chloroethane" patented technology

The invention discloses an aluminum-silicon based aluminum section. The aluminum section is composed of, by weight, 5.0-14.0% of silicon, 0.2-0.7% of magnesium, less than 0.03% of boron, less than 0.06% of strontium, 0.1-6.55% of strengthening elements, less than 0.25% impurity elements, and the balance aluminum. The aluminum-silicon based aluminium section has the advantages of high strength, high hardness, good wear resistance, etc. the invention also discloses a preparation technology for the aluminum-silicon based aluminum section, which comprises a first step of adding aluminum-silicon alloy to a graphite crucible and heating the alloy to form melt; a second step of adding the magnesium, the silicon and the strengthening elements; a third step of adding hexachloroethane for refinement; a forth step of adding the strontium for deterioration, casting to a cast iron die to form an ingot casting; and a fifth step of hot extruding, hot rolling for deformation, solid solution treating and aging treating in sequence after annealing the ingot casting, thereby obtaining the aluminum-silicon based aluminum section. The preparation technology is simple.

The invention relates to a high efficiency compounded refiner for hypoeutectic aluminum-silicon alloy and the method of application. It contains 10-30wt% NaCl, 10-15wt% KCl, 10-20wt% sodium fluoride, 1-30wt% potassium fluoborate, and 1-20wt% potassium fluotitanate, 1-20wt% strontium carbonate, 1-15wt% cerium fluoride, 5-20wt% granular lanthanum abundant mixed rare earths and 1-5% heachloroethane. After taking the process of heating, dehydrating, mixing according to the ratio to equal, pressing to molding, it could be sealed to use. The technology includes the following steps: after the magnesium alloy melting in crucible, heating to 720-740 degree centigrade and removing the slag, standing for 3-5 minutes, pressing the refiner into alloy liquid to take refining process for 5-10 minutes, standing for 5-10 minutes after process to gain hypoeutectic aluminum-silicon alloy melt. The invention simplifies melt process technology, lowers cost and improves the capability of alloy.

A method for producing 2,2,2-trifluoroethanol in which a γ-hydroxybutyric acid salt is reacted with 1,1,1-trifluoro-2-chloroethane to generate 2,2,2-trifluoroethanol is provided. This method leads to increased yields of 2,2,2 -trifluoroethanol, facilitates the separation of salt byproducts and allows the recycling of an aprotic polar solvent.

The present invention concerns a method for producing 2,2,2-trifluoroethanol in which a γ-hydroxybutyric acid salt is reacted with 1,1,1-trifluoro-2-chloroethane in an aprotic polar solvent to generate 2,2,2-trifluoroethanol. This method is characterized in that the γ-hydroxybutyric acid salt used contains no more than 6 wt % of 4,4′-oxybis(butyric acid).

A novel optical film capable of readily vitrifying the tendency and state of liquid crystal alignment, excellent in the ability to retain the alignment state, and suitable for the application to optical elements. The film is produced from a liquid-crystal material containing as the essential ingredient a liquid-crystal polyester having structural units (A) and (B) as the essential unit, exhibiting a vitrified state at a temperature lower than the liquid-crystal transition point, and having a logarithmic viscosity number (eta) of 0.04-0.4 dl/g as measured at 30° C. in a phenol/tetrachloroethane solvent (60/40 by weight), wherein each X represents independently O or C=O; each Y represents independently a group selected from among F, Cl, Br and 1-4C alkyls; and n is 0 or 1.

The invention discloses a low-melting-point and high-strength aluminum-based brazing filler metal and a preparation method thereof. The brazing filler metal consists of the following components in percentage by mass: 6 to 13 percent of Si, 6 to 13 percent of Cu, 1 to 3 percent of Ni, 0.01 to 0.1 percent of Sr, 0.01 to 0.2 percent of Ti, 0.01 to 0.2 percent of Y and the balance of Al. The preparation method comprises the following steps of: weighing each component; adding the components into a graphite crucible melting furnace according to a certain sequence; melting and then refining twice, wherein argon gas and hexachloroethane are used as refining agents during the refining; introducing the hexachloroethane from bottom of solution by the argon gas, wherein the introduction pressure of the argon gas is 5 to 7KPa; and continuously casting solution which is subjected to the second refining process under the protection of nitrogen gas as required or performing gas atomization to form the aluminum-based brazing filler metal in different forms. The aluminum-based brazing filler metal prepared by the method has the superior characteristics of low melting point, high strength, toughness, wettability and spreadability and the like.

The method for producing vinylidene fluoride by using difluorine-chloroethane includes the following steps: adopting superheated steam, mixing it with difluorine-chloroethane and making them produce cracking reaction in tube reactor, then making the crackate undergo the processes of quenching, low-pressure condensation dewatering, drying treatment, removing high boiler, removing liquid component, rectifying vinylidene fluoride and recovering vinylidene fluoride and difluorine-chloroethane from residue so as to implement goal of said invention. The invented difluorine-chloroethane conversion rate can be up to 95%, selectivity of vinylidende fluoride is greater than 99% and its vinylidene fluoride monomer purity is greater than or equal to 99.99%.

The invention discloses a method for preparing bromination polystyrene, which includes (1) adding 10-30 parts by weight of styrene into 100 parts by weight of dichloroethane and adding 0.1 to 0.5 parts by weight of BPO or AIBN to obtain polystyrene dichloroethane solution; (2) adding 0.1 to 3 parts by weight of lewis acid catalyst and 0.1 to 3 parts by weight of backbone protective agent in the above prepared solution and then dropping 30 to 90 parts of bromine chloride dichloroethane solution to obtain bromination polystyrene dichloroethane solution; (3) adding 00.5 to 0.1 parts by weight ofneutralizer into the above prepared solution, conducting washing and static layering, adding 0.1 to 3 parts by weight of fat removing bromine preventing agent in the layered organic layers, conducting flash evaporation, cooling, centrifugation and drying on the organic layer to obtain the product. The process is capable of manufacturing polystyrene with narrow molecular weight distribution, and the polystyrene can obtain bromination polystyrene with controllable molecular weight after bromination.

The invention relates to a method for refining a chlorine hydride byproduct and recovering trifluoromethane in production of monochlorodifluoromethane. Refined high-purity chlorine hydride can directly serve as a raw material for synthesizing vinyl chloride monomers; and the trifluoromethane byproduct separated in the refining process can be effectively recovered, wherein the refining of the HCl comprises the following steps of: crude separation, absorption, analysis, condensation, capture of acid mist, and adsorption; and after a F23 byproduct in the production of the monochlorodifluoromethane is separated in the absorption process in the refining of the HCl, the F23 byproduct is subjected to lossless compression and rectification to form the trifluoromethane with the purity of over 99 vol percent. By combining the recovery and comprehensive utilization of the HCl and the recovery of the trifluoromethane, the high consumption of water resources and liquid caustic soda is avoided, and the production cost of the monochlorodifluoromethane is reduced; and the effective recovery of the trifluoromethane prevents environmental pollution, and the chloroalkali, the monochlorodifluoromethane and polyvinyl chloride (PVC) can be circularly produced.

The invention discloses a method for preparing a 3D rapid prototyping alumina-zirconia-carbon ceramic powder material. The method is characterized by comprising the following steps: firstly, pre-treating alumina-zirconia-carbon ceramic powder with N-(beta-aminoethyl)-gamma-amino propyl trimethoxy silane and stearic acid to obtain pre-treated alumina-zirconia-carbon ceramic powder; then, adding the following components in percentage by mass: 60-70 percent of trichloroethane and 2-5 percent of bisphenol A polycarbonate into a reactor, stirring and dissolving, and adding 26-36 percent of the pre-treated alumina-zirconia-carbon ceramic powder, uniformly stirring and mixing, intensively stirring at constant temperature of 50+/-5 DEG C, refluxing to react for 5-7 hours, and drying by spraying to obtain the rapid prototyping alumina-zirconia-carbon ceramic powder material. The material does not need to spray adhesive, can be directly molded in a molding temperature range of 220-230 DEG C, has the advantages of simple preparation process, easily controlled condition and low production cost, and is easy for industrial production.

The invention provides a preparation method of 1,1-difluoroethylene (vinylidene fluoride (VDF)). Under the action of a catalyst, a gas phase of 1,1-difluoro-1-chloroethane (HCFC-142b) is subjected to dehydrochlorination to generate the 1,1-difluoroethylene. The catalyst is composed of a main catalyst and a co-catalyst; the main catalyst is a nitrogen-containing carbon material; the co-catalyst is chloride of transition element, alkali-earth metal and lanthanide metal. The method for preparing the 1,1-difluoroethylene, provided by the invention, has the characteristics of low reaction temperature, high product selectivity, high yield, uneasiness of blocking a pipeline, moderate conditions of a preparation process, simplicity in operation and the like.

The invention relates to a monoazo compound, a preparation method and an application thereof. The azo compound is shown in the formula (1), wherein, R1 is hydrogen, methyl, ethyl, allyl, butyl, methoxy carbonyl ethyl and an ethoxy carbonyl ethyl; R2 is the hydrogen, the methyl and the ethyl; R3 is C1-6 alkyl, wherein, atoms can be included or not included for the alkyl chain; R4 is the hydrogen, the methyl, the ethyl, -NHCO-C1-4 alkyl and halogen, and the C1-4 alkyl in the -NHCO-C1-4 alkyl is the methyl, the ethyl, 2-methicillin ethyl and chloroethane; R5 is the hydrogen, the methoxy, the ethoxy, the 2-methicillin ethyl and the halogen. The preparation method comprises: the monoazo dye which contains the halogen is first prepared; and then cyan is used for replacing the halogen substituent. The monoazo compound of the invention which can be applied in polyester dyeing has the advantage of excellent application fastness.

The invention provides a method for preparing lidocaine hydrochloride, and belongs to the technical field of anesthetic synthesis. The method comprises the following steps: by taking 2,6-xylenol as a raw material, Pd/C as a main catalyst and 2,6-dimethylcyclohexanone as a promoter, performing liquid phase amination with ammonia water at high temperature, thereby obtaining a midbody 2,6-dimethylaniline; enabling sodium methylate, 2,6-dimethylaniline and N,N-lignocaine methyl acetate as raw materials to react at 90-95 DEGC, distilling while reaction is performed to remove methanol till no methanol can be evaporated out, continuously reacting for 30 minutes, cooling to the room temperature, adding dichloroethane, washing with water, and leaving to stand to layer, thereby obtaining an organic layer, namely, a lidocaine based dichloroethane solution; further adding hydrochloric acid into the lidocaine based dichloroethane solution, adjusting the pH value to be 3.5-4 by using hydrogen chloride, adding activated carbon to reflux for 20-40 minutes, filtering, concentrating the filtrate, cooling, crystallizing, and dying, thereby obtaining lidocaine hydrochloride. The lidocaine hydrochloride prepared by using the method is simple in synthesis process and high in product purity, that is, the purity can be greater than 99%, and the total yield is greater than 84%.

The invention relates to a facultative methanotroph capable of degrading chlorohydrocarbons, and its applications. The strain of the methanotroph has a preservation number of CCTCCNO:M2013062. The methanotroph can utilize carbon-rich carbon sources comprising ethanol, sodium acetate and the like, and overcomes application difficulties comprising low methane-oxidizing bacterium thallus density, difficult thallus enlargement culture and the like. The methanotroph can degrade chloroolefins comprising trichloroethylene, dichloroethylene, chloroethylene and the like, can also degrade chloralkanes comprising tetrachloromethane, trichloromethane, dichloroethane and the like, and is especially suitable for the fields of wastewater, drinking water and soil restoration.

The invention provides a process for producing high-purity methane chloride. The process comprises the following steps of: introducing vaporized and overheated methanol and hydrogen chloride a reactor containing an alumina catalyst and reacting in the reactor to generate a mixture of methane chloride, methane, chloroethane and dichloromethane; introducing the generated mixture to a chilling device, carrying out chilling separation and then introducing into an acid-washing tower, an alkaline washing tower and a sulfuric acid drying system, compressing to prepare coarse methane chloride; leading the coarse methane chloride into a treating column and separating out heavy components from the bottom of the treating column; evaporating light-component methane and methane chloride to the top of the treating column together; then performing water cooling and deep freezing so that the methane chloride is liquefied, completely discharging the methane which is not liquefied into an exhaust washing tower by a deep freezer so as to separate methane chloride from methane and finally obtain high-purity methane chloride. In the invention, a single-tower rectification manner is adopted, therefore, equipment investment is not increased greatly, but also the content of methane chloride is increased to be higher than 99.98%.

A process for preparing difluorochloro ethane from difluoroethane and chlorine gas includes proportionally mixing, three-class photo-chemical reaction while regulating light flux for presenting the high-boiling-point substance peaks with different heights, removing acid, alkali washing, compressing, degassing, rectifying and drying. Its equipment is disclosed also. Its advantages are high conversion rate of difluoroethane and high selectivity and purity of product.

The invention discloses a nitrogen-doped activated carbon catalyst and application thereof. The preparation method of the nitrogen-doped activated carbon catalyst comprises the following steps: adding a nitrogen-containing compound into water to dissolve to obtain a nitride solution, wherein the nitrogen-containing compound is one or more of ammonia water, ammonia gas, pyridine, pyrrole, imidazole, acrylamide, polyacrylamide and polyvinylpyrrolidone; adding activated carbon into the nitride solution to soak; completely drying the soaked activated carbon, and calcining in nitrogen atmosphere, thereby preparing the nitrogen-doped activated carbon catalyst. The nitrogen-doped activated carbon catalyst disclosed by the invention has very good catalysis property in reaction of catalyzing tetrachloroethane and acetylene to generate trichloro ethylene and chloroethylene and catalyzing tetrachloroethane gas phase cracking to generate trichloro ethylene.

In one embodiment of the invention a method to prepare sucralose-6-acylate through chlorinating sucrose-6-acylater by BTC in the process of sucralose preparation is disclosed. In this embodiment a Vilsmeier reagent is firstly prepared below 0° C. by dissolving BTC in DMF or in component solvent, containing DMF, toluene, dichloroethane, chloroform and carbon tetrachloride. Consequently, sucrose-6-ester was chlorinated by Vilsmeier reagent. BTC can also be dissolved in one or several organic solvent such as toluene, dichloroethane, chloroform and carbon tetrachloride, and added to a DMF solution of sucrose-6-acylate for chlorination. Sucralose was prepared through de-esterifying the obtained sucralosed 6-ester using sodium methoxide/methanol or sodium ethoxide/ethanol.

The invention relates to a method for preparing tetrachloroethylene through pentachloroethane liquid-phase catalysis, which comprises the following steps of: an intermittent method: by using high-purity pentachloroethane as a raw material, adding a metal halide as a catalyst according to the percentage by weight, stirring and heating in a reactor, and intermittently reacting and distilling under a normal pressure to obtain a crude tetrachloroethylene product; or a continuous method: by using the prepared crude tetrachloroethylene product as a mother solution, adding the metal halide as the catalyst, stirring, heating, then adding the high-purity pentachloroethane, maintaining the reaction, then heating to prepare the crude tetrachloroethylene product, and continuously adding the high-purity pentachloroethane to continuously produce the crude tetrachloroethylene products with the same volume; and carrying out water-alkali washing for the crude products prepared by the two methods to be neutral, separating, drying and rectifying to obtain a tetrachloroethylene finished product. The environmental-protection difficult problem of serious environmental pollution brought by traditional calcium-hydroxide saponification is radically solved, particularly the usage amount of the catalyst is small in the continuous method, materials are continuously fed and produced, the method is simpler and more labor-saving to operate, the cost is low, the method is suitable for large-batch production, the utilization ratio of the materials is high, and the purity of the prepared product reaches up to more than 99.8 percent.

Preparing a chromium oxide catalyst for preparing pentafluoroethane using chloroethane comprises heating chromium hydroxide powder at greater than 300 DEG C. to give chromium oxide powder; heating a metal hydroxide selected from magnesium hydroxide, iron hydroxide, molybdenum hydroxide, vanadium hydroxide or aluminum hydroxide at 300 DEG C. or less to give a metal oxide powder e.g. magnesium oxide, iron oxide, molybdenum oxide, vanadium oxide or aluminum oxide; mixing the chromium oxide powder (85-99.5 wt.%) with the metallic oxide powder (0.5-15 wt.%); granulating the obtained mixture; calcining the granules at 200-300 DEG C. under nitrogen gas medium; and calcining the obtained granules at 300-320 DEG C. under a gas mixture comprising nitrogen and hydrogen fluoride (HF) and then at 320-380 DEG C. using HF gas. According to the invention, the fluorinating catalyst can be efficietly to prepare HFC-125 using chloroethane as a material and high yield is achieved.