533 results about "Tetrachloroethylene" patented technology

The invention discloses a method for preparing graphene, which belongs to the technical field of chemical synthesis. The method is characterized in that sodium metal and halogenated hydrocarbon are taken as raw materials to react in a solvent in inert atmosphere so as to prepare the grapheme; reaction temperature is preferably between 120 and 400 DEG C, and is more preferably between 160 and 360 DEG C; the molar ratio of the sodium metal to the halogenated hydrocarbon is preferably between 1:1 and 100:1, wherein the halogenated hydrocarbon can be added before reaction or during the reaction; and the halogenated hydrocarbon is preferably halogenated C1-4 aliphatic hydrocarbon and halogenated benzene, such as tetrachloroethylene, hexachlorobenzene, trichloroethylene, bromobenzene, ethylenetetrabromide and the like. The method also preferably performs post-treatment on the prepared graphene so as to improve purity. The method has the advantages of simple equipment, easy operation, low cost, high yield and good product properties, can play an important role in the industrial production of graphene and related products such as lithium ion batteries and the like, and is broad in application prospects.

The invention relates to neutral mononuclear copper (I) complexes for emitting light and with a structure according to formula (A) in which: M represents: Cu(I); L∩L represents: a single, negatively charged, bidentate ligand; N∩N represents: a diimine ligand (substituted with R and FG), in particular a substituted 2,2′-bipyridine derivative (bpy) or a substituted 1,10-phenanthroline derivative (phen); R represents: at least one sterically demanding substituent for preventing the planarisation of the complex in the excited state; FG=functional group, and represents: at least one second substituent for increasing solubility in organic solvents. The substituent can also be used for electron transport or alternatively for hole transport, said functional group being bound to the diimine ligands either directly or by means of suitable bridges; and the copper (I) complex: having a ΔE(S₁−T₁) value of less than 2500 cm⁻¹ between the lowest excited singlet state (S₁) and the triplet state (T₁) which lies below; having an emission lifespan of at most 20 μs; having an emission quantum yield of greater than 40%, and a solubility of at least 1 g/L in organic solvents, in particular polar organic hydrocarbons such as acetone, methyl ethyl ketone, benzene, toluene, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, dichloroethane, tetrachloroethylene, alcohols, acetonitrile or water.

The invention relates to the technical field of electroplating pretreatment, in particular to a process for carrying out vacuum cleaning, oil removal and wax removal by a modified hydrocarbon cleaner. The process comprises degassing ultrasonic cleaning, vacuum cleaning, vacuum steam flushing, vacuum drying and the like. A plurality of flows are carried out in the vacuum environment with a certain vacuum degree and are matched with a degassing ultrasonic cleaning and vacuum cleaning technology and the modified hydrocarbon cleaner. For the cleaning process, in the whole process, harmful substances of halogen and the like, such as trichloroethylene, methylene chloride, tetrachloroethylene and the like, cannot be used and additional drying equipment is not required. Particularly, the process has excellent cleaning effect on irregular articles with blind holes, joints, gaps, cracks and the like. Meanwhile, the defects of oil removal and wax removal of the conventional process are overcome.

The invention relates to a method for synthesizing carbide nano powder by a solid-phase reaction, which comprises the following steps of: mixing a silicon source or a metal source, a carbon source, magnesium powder and elementary iodine according to a mol ratio of 1: (0.05-2): (1-25): (1.25-12), sealing the mixed material in an autoclave, and placing the autoclave in a drying box to perform a reaction for 6 to 48 hours at the temperature of between 100 and 500 DEG C; and washing, separating and drying the product to obtain the carbide nano powder. In the invention, glucose or maltose which universally exists in the natural world is used as the carbon source to avoid using a chlorine-containing carbon source such as carbon tetrachloride and tetrachloroethylene which have bad influences on an operation environment, and the reaction temperature and the reaction pressure are relatively mild, so that the method for synthesizing carbide nano powder by the solid-phase reaction has a potential for mass production.

The invention discloses a cleaning agent for electromechanical equipment. The cleaning agent comprises the following components in percentage by weight: 20-40 percent of halogenated hydrocarbon, 55-75 percent of petroleum solvent, 3-8 percent of butyl cellosolve and 0.05-1 percent of benzotriazole, wherein the halogenated hydrocarbon is one or the mixture of components comprising tetrachloroethylene and dichloromethane. The cleaning agent is not easy to burn at normal temperature, has good insulating property and voltage resistance, can be widely applied to the cleaning of various electrical equipment and mechanical equipment and has convenient raw material sources, low cost and simple operation. Large equipment can be cleaned by an injection method, and small equipment or parts can be cleaned by a dipping method.

The present invention provides an industrial production method for tetrachloroethylene. The method is characterized by adopting monochloromethane or natural gas, excess chlorine gas, and a methane chloride as raw materials, and carrying out a reaction to produce tetrachloroethylene, wherein the methane chloride is any one or a mixture selected from dichloromethane, trichloromethane, and carbon tetrachloride according to any ratios. The preparation method of the present invention has the following advantages that: raw material conversion rate is high, the produced heavy component is decomposed, and then can return to a reactor to generate tetrachloroethylene, and the by-produced hydrogen chloride can be converted into monochloromethane for providing a raw material for a methane chloride apparatus or a tetrachloroethylene synthesis apparatus so as to achieve maximum chlorine resource utilization.

The invention discloses a decarburization cleaner. Perchloroethylene and methylen chloride or dichloropropane without flammable risk are used as decarburization solvents of the invention; on the basis of the permeability and dissolution of the solvents, the surfactant sodium alkyl sulfonate is compounded, thus promoting and improving the dirt-removing power, and trolamine is taken as antirusting agent without affecting the activity of the surfactant. The invention also discloses a formula and a preparation method of the decarburization cleaner. No heating or stirring is needed in using the invention, excellent using effect can be achieved by soaking at room temperature, energy consumption can be reduced remarkably. The pH value is neutral, thus having no corrosion on the surface of the material. The product has the characteristics of low toxicity, non-combustion and the like, thus the safety is improved greatly. The invention can be recycled only by simple filtering, thus saving using cost.

The invention discloses an industrial level machinery equipment cleaning compound comprising 20-35% of waterless sodium metasilicate in mass, 10-25% of cosolvent in mass, 10-25% of surfactant in mass, 3-5% of antiseptic in mass, 2-4% of corrosion inhibitor in mass, 1.2% of thickening agent in mass and remaining deionized water; the surfactant is a mixture composited by RF-25-1 surfactant, aliphatic acid methyl esters ethoxylate (FMEE) and alkyl glucosides FC-41 according to mass ratio of 1:2:1; the cosolvent comprises at least two from a group formed by isopropanol, glycerol, dichloromethane and tetrachloroethylene; the antiseptic is chlorothalonil powder; the corrosion inhibitor is methyl benzotriazole TTA; the thickening agent is carboxymethylcellulose sodium. Through the said mode, the machinery equipment cleaning compound is anti-bacterium, environmental protection, and can clean the machine equipment with high efficiency.

The invention discloses an electrical appliance cleaner, which selects comparatively safe methylen chloride, perchloroethylene, F141B to be constituents. Perchloroethylene has high KB value and strong decontaminating and degreasing ability, can form a layer of waterproof protecting film on the surface of material before full volatilization to prevent water vapour from accumulating, and can be used as the cleaner of the invention. F141B has very strong volatility, which can be used for adjusting the volatility of the product. Methylen chloride also has volatility, decontaminating ability and excellent permeability, which is used for improving the resultant force of the product. The electrical appliance cleaner of the invention is safe in use without flash point or fire point, does not burn while encountering with open fire; the electrical appliance cleaner can replace gasoline, xylene and other flammable organic solvents; the electrical appliance cleaner has no obvious effect on vast majority of plastics, rubber and other high molecular compounds.

The invention discloses a glue removing agent for LED (light emitting diode) encapsulation residue glue. The glue removing agent is basically prepared from the following ingredients in percentage by weight: 30 to 80 percent of solvents, 10 to 60 percent of diluting agents, 5 to 10 percent of penetrating agents, 0.1 to 5 percent of metal protecting agents, 0.1 to 5 percent of catalysts and 0.1 to 0.5 percent of surface active agents. The product can be used for removing silica gel and epoxide resin encapsulation glue remained by an LED encapsulation material on equipment; the effect is good; no corrosion is left on the equipment; toxicity on the human body is low; compared with conventional methylene dichloride, carbon tetrachloride, tetrachloroethylene, acetone, toluene, xylene and vinyl acetate, the effect is equivalent; the consumption is low; the environment-friendly effect is achieved; the use is convenient.

The invention discloses a method for recovering organic chloride from rectification residues of methane chloride or/and tetrachloroethylene. The method specifically comprises the steps of leading the rectification residues of methane chloride and tetrachloroethylene into an evaporator to perform evaporation, condensing volatile components into liquid and then feeding the liquid into a trap device and transferring the residues into a sublimator; using a tetrachloroethylene rectification system to separate trichloromethane, carbon tetrachloride and the tetrachloroethylene from a part of light component mixed liquid; meanwhile sublimating the residues in the sublimator under the 240-250 DEG C condition, cooling the residues through a condensation device to obtain an initial hexachloroethane product; leading the light component mixed liquid into a refining pan, adding and dissilving the initial hexachloroethane product and then transferring the product into a crystallizing pan for crystallization; performing filtration after the crystallization, collecting a filter cake and filtrate, drying the filter cake to obtain a hexachloroethane product and leading the filtrate into the evaporator for continuous circulation. The method is simple and adopts simple devices, additional solvents and raw materials are not needed, and the method has good environment-friendly benefit and social benefit.

The invention belongs to the field of cleaning agents, and particularly relates to a BS-791 deadhesive cleaning agent and a preparation method thereof. The deadhesive cleaning agent comprises, by weight, 50-60 parts of dichloromethane, 2-10 parts of ethyl alcohol, 20-30 parts of tetrachloroethylene, 3-8 parts of ethyl acetate, 2-8 parts of xylene, 1-3 parts of acetone, 1-3 parts of surface active agents and 1-3 parts of additives. The BS-791 deadhesive cleaning agent can rapidly clean glue scales and other scales of various positions of various chemical devices and pipelines and the like, the glue scales on the devices can soften, expand and dissolve, so that the glue scales are cleaned, and the cleaning agent solves the problem of cleaning of material scales of chemical industries. The cleaning agent is obvious in cleaning effect, free from residue, wide in popularization and application prospect and remarkable in economic benefit.

Iron composite particles for purifying soil or ground water, comprise an iron component, at least one noble metal selected from the group consisting of ruthenium, rhodium and palladium, and carbon or aluminum, and having a noble metal content of 0.01 to 5.00% by weight and a particle diameter of 0.01 to 1.0 μm. The iron composite particles and the purifying agent according to the present invention are capable of decomposing aliphatic organohalogen compounds such as dichloromethane, carbon tetrachloride, 1,2-dichloroethane, 1,1-dichloroethylene, cis-1,2-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, trichloroethylene, tetrachloroethylene, 1,3-dichloropropene or the like, and aromatic organohalogen compounds such as dioxins, PCB (polychlorinated biphenyl) or the like, which are contained in soil, ground water or waste water, at ordinary temperature in an efficient and economical manner.

An apparatus and method for anaerobic biodegradation, bioremediation or bioprocessing of hydrocarbons dissolved in an aqueous matrix, such as wastewater, groundwater, or slurry. Dissolved alkanes (saturated hydrocarbons), alkenes (unsaturated hydrocarbons), aromatic hydrocarbons and/or halogenated hydrocarbons are metabolized or cometabolized. In one form, the invention involves introducing an aqueous stream comprising at least one dissolved aromatic hydrocarbon (such as benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, phenol, o-cresol, m-cresol, or p-cresol) and a dissolved oxide of nitrogen [such as nitrate (NO3-), nitrite (NO2-), nitric oxide (NO) and nitrous oxide (N2O)] to a reactor, and operating said reactor under conditions that support denitrification of the aromatic hydrocarbon. Alternatively, the aqueous stream may comprise at least one alkane (such as ethane) and/or at least one alkene (such as ethene or ethylene) and biodegradation of these compounds is accomplished. In a preferred form, the aqueous stream also comprises at least one dissolved halogenated hydrocarbon (such as tetrachloroethylene, trichloroethylene, or 1,1,1-trichloroethane) and dehalogenation of the halogenated hydrocarbon is accomplished. The reactor may be a continuous stirred tank reactor, a batch (or sequencing batch) reactor, a plug-flow reactor, a fixed-film reactor, or a pore space in an underground aquifer in situ. The reactor is operated in such a way that molecular oxygen is excluded from the space or zone in which the biodegradation is occurring and the other requirements of denitrifying bacteria are met. In some implementations, kinetic control (control of mean cell residence time) is used to enrich a denitrifying culture in the reactor.

The invention discloses a production process for production of tetrachloroethylene and coproduction of hexachloroethane by using methane chloride residual liquid. According to the production process, the methane chloride residual liquid subjected to vaporization and overheating and excessive chlorine enter a reactor, the mixed gas after reaction enters a chilling tower, a tetrachloroethylene crude product in gas phase is extracted out from the top side line of the chilling tower, the gas containing carbon tetrachloride, excessive chlorine and hydrogen chloride passes through three stages of condensers and a separation tank in sequence, one part of condensed liquid-phase material carbon tetrachloride is used as chilling liquid, and the other part of condensed liquid-phase material carbon tetrachloride is returned to the system for reaction, so that the aim of consuming the methane chloride residual liquid through continuous circulation is achieved; hydrogen chloride and excessive chlorine are absorbed by using water and subjected to steam stripping, and chlorine is returned to the reaction system; the materials at the bottom of the chilling tower are treated in a lightness-removing column, so that the light components including tetrachloroethylene and pentachloroethane are separated and returned to the reactor for reaction; and hexachloroethane is subjected to rectification to obtain a hexachloroethane finished product. According to the production process, the methane chloride residual liquid is subjected to innocent treatment to prevent environmental pollution caused by improper treatment.

The invention discloses a preparation method of 3,5-dimethyl-4-chlorophenol, which takes tetrachloroethylene as a solvent, benzyl thiophenol and aluminium chloride as cocatalysts, sulfuric chloride as a chloridizing agent, orientation chlorination is carried out through two phases of low-temperature chlorination and high-temperature chlorination, the mass ratio of tetrachloroethylene to MX is 0.5-4: 1; the mass ratio of the cocatalyst to MX is 2.5-6.5:1000; at low temperature chlorination phase, the mass ratio of sulfuric chloride dropping amount to MX is 0.9-1.2: 1; at high temperature chlorination phase, the mass ratio of sulfuric chloride dropping amount to MX is 0.1-0.2: 1; the temperature at the low temperature chlorination phase is controlled at 30-45 DEG C, chlorination is carried out for 4-6 hours; the temperature at high temperature chlorination phase is controlled at 50-65 DEG C, and chlorination is carried out for 1-2 hours, insulation reaction is carried out after the dropping process of sulfuric chloride is completed, tail gas is removed for 1-2 hours, and steps of water-washing layering, cooling and crystallizing, centrifuging and washing, and drying to obtain the product. According to the method, the conversion rate can reach more than 95%, finished product PCMX yield is increased, and the by-product can be effectively reduced.

The invention provides a preparation method of 2-cyano-4'-bromomethylphenylbenzene, which comprises the following steps: (1) adding 2-cyano-4'-methylphenylbenzene, dibromohydantoin and tetrachloroethylene into a reactor, adding a catalyst, and evenly mixing, wherein the mol ratio of 2-cyano-4'-methylphenylbenzene to dibromohydantoin to tetrachloroethylene to catalyst is 1:(0.5-0.6):(8-12):(0.008-0.012), and the catalyst is tetrabutyl ammonium bromide, cetyl trimethyl ammonium bromide or benzyl triethyl ammonium bromide; (2) heating to react, wherein the reaction temperature is controlled at 60-120 DEG C, and the reaction time is controlled at 4-8 hours; and (3) after the reaction finishes, cooling, filtering, concentrating to recover the tetrachloroethylene, and recrystallizing with methanol or ethanol or isopropanol to obtain the 2-cyano-4'-bromomethylphenylbenzene. The production process provided by the invention has the advantages of high operation safety, simple technique, low cost and high yield.

The invention belongs to the technical field of oil exploitation, and particularly relates to a hydrogenation heat gas chemical yield increasing solution component capable of being used for increasing productivity of a low-permeability carbonate reservoir oil well. The solution component comprises first solution, second solution and third solution, the mass ratio of the first solution, the second solution and the third solution is 1:1:3, the first solution comprises urea CO(NH2)2, sodium nitrite NaNO2, hydrazine N2H4 and water H2O, the second solution comprises aluminum chloride AlCl3, sodium hydride NaH, ammonium chloride NH4Cl and tetrachloroethylene C2Cl4, and the third solution comprises hydrochloric acid HCl, methenamine (CH2)6N4 and alkylphenol ethoxylate C9H19C6H4O(C2H4O)nH. Compared with an acidizing and fracturing process, a hydrogenation heat gas chemical method is simple in process, has the advantage of combination of heat recovery, fracturing and acidizing, is long in yield increasing duration and high in recovery ratio, and can be applied to carbonate oil reservoir exploitation.