108 results about "Ozone depletion potential" patented technology

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 hydrfluorocarbons. 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.

The present invention provides a method for synthesizing 2,3,3,3-tetrafluoropropene, which uses hexafluoropropene as a starting material, and undergoes multi-step hydrogenation reduction, HF removal and other steps to obtain high-purity target product 2,3 , 3,3-Tetrafluoropropene. The raw material hexafluoropropylene of the method is easy to obtain, and can be prepared by existing methods in the art, and can also be purchased commercially. The prepared 2,3,3,3-tetrafluoropropene is an excellent refrigerant substitute and has the advantages of zero ozone depletion potential (ODP) and low greenhouse effect potential (GWP value of 4).

The invention discloses an environment-friendly refrigerant used for refrigerators, air-conditioners and heat pumps. The refrigerant is composed of trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)), 1,1-difluoroethane (HFC-152a) and difluoromethane (HFC-32). The preparation method is characterized by physically mixing the components under normal temperature according to corresponding proportion. The ozone depletion potential (ODP) is zero and the global warming potential (GWP) is low, therefore, the refrigerant conforms to the requirement of environmental protection, and the refrigerant has physical property equivalent to that of HFC-134a and can be used in the existing HFC-134a system and serve as the substitute refrigerant of HFC-134a.

A new set of effective, environmentally safe, nonflammable, low-toxicity refrigerants, solvents, foam blowing agents, propellants, and firefighting agents is disclosed. The agents are clean, electrically nonconductive, and have short atmospheric lifetimes, zero ozone-depletion potential, and low global warming potentials. The agents comprise at least one fluoroiodocarbon agent satisfying the general formula C_aH_bBr_cCl_dF_eI_fN_gO_h, wherein a is between and including 1 and 8; b is between and including 0 and 2; c, d, g, and h are each between and including 0 and 1; e is between and including 1 and 18; and f is between and including 1 and 2, either neat or mixed with additives selected from the group consisting of: alcohols, esters, ethers, fluoroethers, hydrocarbons, hydrofluorocarbons, and perfluorocarbons.

A turbo chiller that has an oil-free configuration, which reduces the frequency of maintenance and maintenance-induced release of refrigerant, and can achieve a reduced environmental impact by utilizing the characteristics of the low-pressure refrigerant R1233zd(E) that reaches negative pressure at a saturation temperature of 18° C. or lower. The turbo chiller comprises a refrigeration cycle that includes a turbo compressor, a condenser, a decompression device, and an evaporator connected in sequence via piping and is filled with a refrigerant; wherein the refrigerant is a low-pressure refrigerant R1233zd(E) refrigerant with low global warming potential and low ozone depletion potential; the turbo compressor has a direct drive configuration in which a rotating shaft of impellers is directly joined to a motor; and the rotating shaft is supported by magnetic bearings.

The invention belongs to the field of chemical synthesis and relates to a conjugate polyether for hard polyurethane foam and a using method thereof. The hard polyurethane foam made of the conjugate polyether prepared by using a mixture of HFC-365mfc/HFC-227 as foaming agent has excellent dimension stability, compression strength and conductivity coefficient. The invention has the advantages that: the mixture of HFC-365mfc and HFC-227ea, which serves as the foaming agent, has a zero ozone depletion potential (ODP) value and therefore completely meets the environment-protection requirement on substitutive HCFC-141B in the electric water heater industry; and the mixture of HFC-365mfc and HFC-227ea is liquid at normal temperature and has no flashing point, so equipment reconstruction is not needed and the production is safe.

A scroll compressor employs therein a refrigerant having a small global warming potential and a small ozone depletion potential and mainly comprising hydrofluoroolefin having a carbon-carbon double bond. A stationary scroll has and end plate and a discharge port defined in the end plate at a central portion thereof so as to open into a discharge chamber. The stationary scroll also has a bypass hole defined in the end plate to allow a plurality of compression chambers to communicate with the discharge chamber before the compression chambers communicate with the discharge port. A check valve is provided on the bypass hole to allow the refrigerant to flow from the compression chambers to the discharge chamber. This construction can restrain a baneful influence on the global environment, reduce a temperature increase caused by excessive compression, and restrain decomposition of the refrigerant even in long-term use.

The invention discloses an environment-friendly low-viscosity high-strength polyurethane grouting lifting material and a preparation method thereof. The environment-friendly low-viscosity high-strength polyurethane grouting lifting material consists of a component A and a component B, wherein the component A mainly comprises composite polyether polyol, a low-viscosity epoxy resin compound, an amine catalyst, a foam stabilizing agent, water and a flame retardant; the component B mainly comprises an organic tin catalyst, polyisocyanate and the like. The ozone depletion potential of the environment-friendly low-viscosity high-strength polyurethane grouting lifting material disclosed by the invention is 0, the environment-friendly low-viscosity high-strength polyurethane grouting lifting material is clean and environment-friendly, and meanwhile has the characteristics of relatively low slurry viscosity, good flowbility, good groutability and the like, the rise time of the material can be controlled within 10-30 seconds, the foaming time of the material can be adjusted within 60-120 seconds, the foam appearance core density of the material can be within 50-80 kg/m<3>, the foams are uniform and dense, and the compression strength of the material is 0.45-0.70 MPa. Meanwhile as foams, rock and soil are all relatively good in adhesion property, the material is applicable to lifting mediation of buildings, traffic roads and projects under different geological conditions.

The invention discloses an immersed liquid phase change cooling medium and application thereof in a cooling system of electronic equipment, wherein the cooling medium is a mixture formed by mixing one, two or three of perfluoro-4-methyl-2-pentene, a hexafluoropropylene tripolymer, perfluorohexanone, perfluoroheptane, perfluorooctane, perfluoro-2-methyl-2, 3-epoxy pentane, perfluorohexane and perfluoropentane. The immersed phase change cooling medium provided by the invention has the characteristics of high electrical insulation property, low viscosity, relatively low boiling point, high gasification latent heat, good compatibility and stability, incombustibility, combustion inhibition, low global warming potential (GWP), zero ozone depletion potential (ODP) and the like.

The invention discloses a mixed working medium for an organic working medium rankine cycle system of a screw expander. The mixed working medium consists of two or three of four organic working media, namely HCFC(hydrochlorofluorocarbon)-123 (2,2-dichloro-1,1,1-trifluoroethane), HFC(hydro-fluoro-carbon)-245fa (1,1,1,3,3-pentafluoropropane), HFC-152a (1,1-difluoroethane) and HFC-134a (1,1,1,2-tetrafluoroethane). The sum of mass percentage of components of each mixed working medium is 100 percent. The preparation method for the mixed working medium comprises the following step of: physically mixing the components in the set mass ratio at normal temperature. The mixed working medium meets environmental protection requirement, namely has the ozone depletion potential (ODP) of zero, low global warming potential (GWP), suitable thermal parameters, good cycle performance and high cycle heat utilization rate.

The invention relates to a mixed refrigerant containing trifluoroiodomethane, which is formed by physically mixing a component 1, a component 2 and a component 3, wherein the component 1 is trifluoroiodomethane having the function of inhibiting combustion and explosion; the component 2 is 1,1-difluoroethane; and the component 3 is propane. In the mixed refrigerant, the content of the component 1 is 1-10 wt%, the content of the component 2 is 20-40 wt%, and the content of the component 3 is 50-75 wt%. The ODP (ozone depletion potential) value of the mixed refrigerant is zero, the GWP (global warming potential) value is much smaller than that of a conventional HFC (hydrofluorocarbon) working medium, and the mixed refrigerant has favorable lubricating oil intersolubility; and thus, the mixed refrigerant can directly substitute an R22 working medium without great changes in the refrigeration system. Since the mixed refrigerant has the combustion inhibiting component, the refrigerant has greatly lower flammability and is even non-flammable, so that the safety of the refrigeration system is greatly enhanced.

The invention relates to a novel environmental-protection refrigerant for substituting 1, 1, 1, 2- tetrafluoroethane (hydrochlorofluorocarbon (HFC)-134a), which is characterized in that 50 to 56kg of propane (R-290) and 40 to 49kg of isobutene (R-600a) of hydrocarbon series are taken as a basis; 2 to 5kg of n-butane (R-600) and 1 to 3kg of propylene (R-1270) are added; and a near-azeotropic mixture refrigerant with the ozone depletion potential (ODP) of 0 and the global warming potential (GWP) of 3 is formed after 0.5 to 1kg of an additive-hexamethylene silicone oil are added for near-azeotropic.

The invention provides a foaming agent composition, a polyurethane foam and a manufacturing method thereof. The foaming agent composition comprises a cyclopentane-isopentane mixture, hydrofluorocarbon and/or fluorochloroalkene and water. The polyurethane foam prepared from the foaming agent composition has greatly lower molding density; and in the process of manufacturing equivalent polyurethane foam, the mass of the required foaming agent composition and other materials for manufacturing the polyurethane foam is reduced, thereby lowering the manufacturing cost of the polyurethane foam. Besides, the ODP (ozone depletion potential) of the foaming agent composition is zero, so the foaming agent composition is harmless to the ozone and is more environment-friendly. In addition, the polyurethane foam prepared from the foaming agent composition has the advantages of lower heat conductivity coefficient, favorable thermal-insulation property, favorable flowability, uniform density distribution, smooth surface, higher foam compression strength and higher dimensional stability, so that the performance of the polyurethane foam can be enhanced.

The invention belongs to the technical field of polyurethane and particularly relates to a spraying polyurethane material of an environment-friendly foaming agent and a preparation method thereof. The spraying polyurethane material has the characteristics that CFA-8125 is used as a foaming agent, the foaming agent is an environment-friendly foaming agent with ODP (Ozone Depletion potential) value of 0 and GWP (Global Warming Potential) value of 1, can not destroy the ozone layer, also can not cause serious greenhouse effect, conforms to the requirements of future development of products, and is an ideal substitute of HCFC-141b; and the foaming agent has no flashing points, and when the foaming agent participates in production of component A, the equipment does not need to be transformed. The spraying polyurethane material and the preparation method have the beneficial effects that flame-retardant elements and flame-retardant structures are introduced into molecular chains to form structural flame retardance, reach corresponding flame-retardance level and maintain persistence of flame retardance. Simultaneously, by induction of a catalyst, excessive isocyanate generates a PIR (Polyisocyanurate) structure, and the PIR structure and high-functionality polyether generate high cross-linking degree, so that good size stability at high and low temperature is realized.

The invention discloses an organic Rankine cycle mixed working medium. The organic Rankine cycle mixed working medium comprises the following components by mass percentage: 70-98% of trans-1-chloro-3, 3, 3-trifluoropropene and 2-30% of second component, wherein the second component is one or two of 2, 3, 3, 3-tetrafluoropropene and trans-1, 3, 3, 3-tetrafluoropropene. The mixed working medium disclosed by the invention is incombustible, the ODP (ozone depletion potential) is close to zero, and the GWP (global warming potential) is very low, so that the mixed working medium is in line with environment-friendly requirements; and thermal parameters are appropriate and the cycle performance is excellent. Under the corresponding working conditions, the cycle efficiency is 8.7-10.9%, and the net power output per unit mass is 13.6-26.0kJ/kg.

The invention provides a low global warming potential (GWP) refrigerant composition, which is directly filled to replace R22 in systems such as a household air conditioning/heat pump and the like. The refrigerant consists of propane and 2,3,3,3-tetrafluoropropene, and a preparation method comprises a step of physically mixing various components in a liquid phase in corresponding proportions. The ozone depletion potential (ODP) value of the refrigerant composition is zero, the GWP value is very low, and the refrigerant composition completely meets the environment-friendly requirement of replacing R22 abroad and at home at present, and represents the development direction of an environmental performance index of next refrigerant substitutes; the pressure of the refrigerant composition is close to that of the R22 and slightly lower than that of the R22, the compression ratio is smaller than that of the R22, and the discharge temperature is greatly superior to that of the R22, which are favorable for long-term operation of a compressor; the COP is slightly higher than that of the R22, and a certain energy-saving effect is achieved; he refrigerating capacity in unit mass is superior to that of the R22, and the refrigerant filling amount of a system can be reduced correspondingly; the refrigerating capacity in unit volume is equal to that of the R22, and the load requirement of a refrigeration air conditioning after the refrigerant composition replaces the R22 can be met; the equipment and parts of the conventional R22 refrigeration air conditioning are not needed to be changed; and the refrigerant composition is soluble with mineral oil, so the refrigerant composition can be directly filled.

There is provided the process for effectively preparing the fluorine-containing polymer without using CFC and HCFC which have a high polymerization rate and a high ozone depletion potential and a coating film having excellent mechanical properties, solvent resistance and chemical resistance can be formed using the obtained fluorine-containing polymer. In preparing the fluorine-containing polymer by polymerizing a monomer containing a fluoroolefin in a polymerization medium, the fluorine-containing solvent having an ozone depletion potential of 0 and a solubility of hydroxybutyl vinyl ether of not less than 0.5% is used as the polymerization medium.

A polymerization medium having small ozone depletion potential and small global warming potential and having a small chain transfer constant is used, to efficiently produce a fluoropolymer having a high molecular weight and having excellent heat resistance, solvent resistance, chemical resistance, etc.

A process for producing a fluoropolymer, which comprises polymerizing a fluoromonomer having a carboxylic acid type functional group and a fluoroolefin using a hydrofluorocarbon as a medium, wherein the hydrofluorocarbon as the medium has 4 to 10 carbon atoms and has a ratio (molar basis) of the number of hydrogen atoms/the number of fluorine atoms (H/F ratio) of from 0.05 to 20.

The invention discloses no-flash-point industrial detergent. The compositions by weight percentage of the no-flash-point industrial detergent are: 15 to 45 percent of 3-methoxyl butyl alcohols, 15 to 52 percent of N-methyl pyrrolidone, 16 to 28 percent of 2-methyl pentanediol and 12 to 28 percent of active solvent. The no-flash-point industrial detergent has the advantages of safety and environmental protection, no corrosion, strong decontaminating and dissolving capacity, good stability, ozone depletion potential ODP and GWP being zero, etc.