30 results about "CFC - Chlorofluorocarbon" patented technology

The invention provides a refrigerating machine oil compound which comprises the following components on the basis of base oil weight: 1) 10 to 90 wt percent of fischer-tropsch syntholube base oil; 2) 1 to 10 wt percent of alkyl benzene and / or alkyl benzene lube base oil; 3) 5 to 85 wt percent of mineral oil and / or poly alpha olefins synthetic base oil; 4) effective quantity of surfactant; and 5) effective quantity of additive. The refrigerating machine oil and a refrigerant containing halogen provided by the invention have the advantages of good intersolubility, higher viscosity index, lower flock point and good thermal oxidation stability, and are particularly suitable for the refrigerating machine oil taking hydrofluorocarbon (HCF) as a refrigerant and the refrigerating machine oil taking chlorofluorocarbon (CFS) or low-molecular alkane as a refrigerant.

A refrigerant mixture for use in multistage auto cascade ultralow and cryogenic temperature refrigeration systems. Particularly, the present invention relates to a refrigerant mixture comprising one hydrochlorofluorocarbon (HCFC) and the major proportion includes hydrofluorocarbons (HFC), fluorocarbons, hydrocarbons and natural gases. More particularly, the present invention relates to non-flammable, non-toxic refrigerant mixture having no chlorofluorocarbon (CFC). Further, the present invention aims in providing a refrigerant mixture having low Ozone Depleting Potential (ODP) combined with low Global Warming Potential (GWP).

The invention provides a preparation method of a pyridylacetonitrile compound, which comprises the following steps: (1) by using pyridylformic acid and CFC (chlorofluorocarbon) as raw materials, reacting with hydrogen peroxide and ferrous chloride in a chloroform solvent under acidic conditions to obtain pyridinecarbonyl chloride; (2) reacting with potassium cyanide in an acetic acid solvent under alkaline conditions to obtain pyridinecarbonyl nitrile; and (3) carrying out reduction reaction with hydrogen and hydrochloric acid under the action of a catalyst to obtain the pyridylacetonitrile. The invention has the advantages of simple synthesis technique and high recovery rate.

The invention discloses a rigid foam polyurethane material with integration of heat preservation, water resistance and thermal insulation. The rigid foam polyurethane material with integration of heat preservation, water resistance and thermal insulation is prepared from, by weight, 70-90 parts of polyaryl polymethylene isocyanate, 20-30 parts of diphenylmethane diisocyanate, 30-50 parts of polyether polyol, 1-3 parts of antioxygen, 2-4 parts of ultraviolet light absorber, 0.8-1 part of catalyst, 1-2 parts of fire retardant, 0.6-1 part of foaming agent, 4-6 parts of dimethylsilicone fluid and 12-18 parts of deionized water. The rigid foam polyurethane material with the integration of heat preservation, water resistance and thermal insulation can be applied to multiple fields of water resistance, heat preservation and thermal insulation of high-floor buildings or accessible roofs or roof gardens, repair and transformation of old buildings, and waterproof and heat-preservation engineering of various buildings of pools, swimming pools and the like, has the advantages of high strength, low weight, water resistance, heat preservation, a good thermal insulation effect, good wear resistance and corrosion prevention and the like, and further has an efficient fire retardant ability; moreover, a chlorofluorocarbon (CFC) foaming agent is not used, so that the material saves energy and is environmentally friendly.

The invention discloses a polyurethane insulation material, prepared from, by weight, 60-80 parts of diphenylmethane diisocyanate, 40-60 parts of plant fiber-based polyether polyol, 30-50 parts of plant oil-based polyether polyol, 1-3 parts of a catalyst, 1-3 parts of an organic flame retardant, 0.5-1 part of a foaming agent, 1-3 parts of silicone oil, and 6-8 parts of deionized water. The polyurethane insulation material has the advantages of high strength, light weight, low heat conductivity, good size stability, good thermal insulation, and good wear resistance and corrosion resistance; the polyurethane insulation material also has efficient flame retardancy and is energy-efficient and environment-friendly due to the absence of chlorofluorocarbon (CFC) foaming agent; in addition, a preparation method is simple, the cost is low, equipment requirements are low, and the production process is environment-friendly.

A bromine-containing solvent, which has been used as an alternative solvent to a chlorofluorocarbon solvent or a chlorine-containing solvent, is characterized in that it is likely to degrade compared with a chlorofluorocarbon solvent or a chlorine-containing solvent. In the conventional bromine-containing cleaner compositions, the degradation of the compositions are prevented by using a corrosion-protecting agent or a stabilizing agent (e.g., nitroethane). However, when the cleaner compositions are used as cleaners for print circuit boards, the reduction in insulation resistance or leak failure is often caused. Thus, provided is a non-flammable cleaner composition comprising a mixture of a bromide selected from n-propylbromide, methylenebromide, bromochloromethane, n-butylbromide, isobutylbromide, sec-butylbromide and ter-butylbromide as a stabilizer for a bromine-containing solvent and an alkene- or alkyne-type hydrocarbon having 4 to 10 carbon atoms.

A bromine-containing solvent, which has been used as an alternative solvent to a chlorofluorocarbon solvent or a chlorine-containing solvent, is characterized in that it is likely to degrade compared with a chlorofluorocarbon solvent or a chlorine-containing solvent. In the conventional bromine-containing cleaner compositions, the degradation of the compositions are prevented by using a corrosion-protecting agent or a stabilizing agent (e.g., nitroethane). However, when the cleaner compositions are used as cleaners for print circuit boards, the reduction in insulation resistance or leak failure is often caused. Thus, provided is a non-flammable cleaner composition comprising a mixture of a bromide selected from n-propylbromide, methylenebromide, bromochloromethane, n-butylbromide, isobutylbromide, sec-butylbromide and ter-butylbromide as a stabilizer for a bromine-containing solvent and an alkene- or alkyne-type hydrocarbon having 4 to 10 carbon atoms.

A method for removing a contaminant from a hydrochlorofluoroolefin (such as trans-1,1,1-trifluoro-3-chloro-2-propene (1233zd(E))) includes extracting a chlorofluorocarbon (such as trichlorofluoromethane (R11)) from a mixture comprising the hydrochlorofluoroolefin and the chlorofluorocarbon using extractive distillation in the presence of an extractive solvent comprising a chlorinated compound to form a purified hydrochlorofluoroolefin. This separation method provides for removal of a contaminant, such as R11, from a hydrochlorofluoroolefin, such as 1232zd(E), which are not separable by conventional distillation methods. The method may employ a process utilizing two distillation columns, for example, a first extractive distillation column and a second solvent recovery column, which allows for recycle of the extractive solvent to the first extractive distillation column.

Disclosed is a combination of hydrofluoroolefins and / or hydrochlorofluoroolefins with stabilizers wherein the stabilizers minimize the degradation of the hydrofluoroolefins and hydrochlorofluoroolefins during storage, handling and use yet allow for atmospheric degradation. The combinations exhibit low or zero ozone depletion potential and lower global warming potential making them of interest as replacements for chlorofluorocarbons and hydrofluorocarbons. The combinations of the present invention comprise hydrofluoroolefins and / or hydrochlorofluoroolefins in combination with a stabilizer or stabilizers selected from free radical scavengers, acid scavengers, oxygen scavengers, polymerization inhibitors and combinations thereof.

A water-blown rigid inorganic hybrid melamine polyurethane foam material and a preparation method therefor, relating to the technical field of production of flame-retardant polyurethane energy-saving materials and building energy conservation. An environmentally-friendly all-water-blown rigid inorganic hybrid melamine polyurethane foam material with B1-grade flame retardation performance according to the present invention is prepared with high-temperature-resistant inorganic hybrid melamine resin polyol or an inorganic hybrid polyol etherified melamine resin, an emulgator, a composite catalyst, a phosphate flame retardant, and a foamer, water or water glass for example, as main raw materials, and by carrying out dispersion by stirring, separately preparing premixed polyether, and then subjecting the premixed polyether to foaming on a sheet making machine, a coating machine, and a casting machine with isocyanate (MDI). The rigid foaming material according to the present invention is free of lower-boiling-point hydrocarbon compound chlorofluorocarbon and hydrochloroflurocarbon compounds, undergoes foaming in virtue of water, and does not destroy the ozone layer nor produce the greenhouse effect, so that the material is environmentally friendly; the flame-retardant property is improved by at least 20%; the material has excellent flame-retardant property while guaranteeing physical properties and has an oxygen index of more than 30%.

The invention belongs to the field of refrigerant, and provides a method for preparing fluorinated alkene by performing dehydrochlorination on chlorofluorocarbon under the action of a catalyst.According to the invention, the novel catalyst is prepared through an impregnation method, reaction of the catalyst and 2-chloro-l, 1, 2-tetrafluoro propane (HCFC-244bb) with lower purity is performed, and then high-temperature gas phase dehydrochlorination reaction is performed to prepare a fluorinated alkene product 2, 3, 3, 3-tetrafluoro propene. Through the adoption of the novel catalyst, the purity requirement on chlorofluoropropane is reduced, so that HCFC-244bb with the purity of 80 percent can be as a raw material, thereby effectively reducing the operating cost of the process; the halohydrocarbon conversion rate is high, and reach up to 60 percent, and the selectivity of the target fluorinated alkene is greater than 90 percent.