191 results about "Chlorofluorocarbon" patented technology

A system for abating undesired component(s) from a gas stream containing same, such as halocompounds, acid gases, silanes, ammonia, etc., by scrubbing of the effluent gas stream with an aqueous scrubbing medium. Halocompounds, such as fluorine, fluorides, perfluorocarbons, and chlorofluorocarbons, may be scrubbed in the presence of a reducing agent, e.g., sodium thiosulfate, ammonium hydroxide, or potassium iodide. In one embodiment, the scrubbing system includes a first acid gas scrubbing unit operated in cocurrent gas/liquid flow, and a second "polishing" unit operated in countercurrent gas/liquid flow, to achieve high removal efficiency with low consumption of water. The scrubbing system may utilize removable insert beds of packing material, packaged in a foraminous containment structure. The abatement system of the invention has particular utility in the treatment of semiconductor manufacturing process effluents.

A process for producing a producing a product of the formula:

R—CF═CHR¹

wherein R is F or CF₃ and R¹ is F when R is F and is H when R is CF₃ by reacting a reactant of the formula:

CF₃—R²

wherein R² is selected from

wherein R³ is H, F or Cl and R⁴ is H or Cl,

in the presence of a suitable catalyst, with a reducing agent selected from methane, methyl chloride and mixtures thereof, in a gas phase reaction.

Aerosol formulations substantially free of chlorofluorocarbons, for oral and/or nasal administration are described. The formulations comprise 1,1,1,2 tetrafluoroethane, a medicament, optionally an excipient and optionally a surfactant. Methods of treatment utilizing the formulations also are described.

The invention relates to suspension aerosol formulations which exhibit stable particle sizes, containing mometasone furoate, about 1 to about 10 weight percent ethanol and 1,1,1,2,3,3,3-Heptafluoropropane as the propellant. A surfactant, such as oleic acid, can also be included. These formulations are suitable for use in metered dose inhalers.

A medicinal aerosol formulation including 0.01-5% medicament, at least 50% by weight 1,1,1,2-tetrafluoroethane (134a), less than 5% surface active agent, and at least one compound having higher polarity than 1,1,1,2-tetrafluoroethane, and which is free of chlorofluorocarbons and propellants CHClF2, CH2F2 and CF3CH3.

Provided are refrigerant compositions which are blends of one or more hydrofluorocarbons, siloxanes, hydrocarbons and lubricants, as well as methods for using these compositions in applications such as the recharging of refrigeration systems and for replacing a chlorofluorocarbon or hydrochlorofluorocarbon in a refrigeration system.

Disclosed are non-flammable, high-solvency compositions having utility as cleaning agents in the electronics and refrigeration industries, and as a medium for mold release agents. The compositions are non-flammable by Flame Extension Test ASTM D-3065 and Flash Point-Tag Closed Cup Test ASTM D-56-82, and have a Kauri Butanol value of at least about 40 by ASTM 1133-94. The compositions comprise the components: a.) trans-1,2-dichloroethylene; and b.) solvent selected from: i.) oxygen-containing solvents selected from alcohols, ketones, esters, siloxanes, and ethers; and ii.) hydrocarbon solvents represented by C_tH_2t+2 or C_tH_2t, wherein t is from 4 to 8; and c.) an inerting agent selected from: i.) hydrofluorocarbon inerting agents represented by the formula C_xH_yF_(2x+2−y), wherein x is from 3 to 8, y is from 1 to 4, and the mole ratio of F/H in the hydrofluorocarbon inerting agent is greater than 1.6; ii.) hydrofluorocarbon ether inerting agents represented by the formula C_rF_2r+1OC_sH_2s+1, wherein r and s are independently selected from 1 to 6, and r is greater than or equal to 2s; and iii.) hydrochlorofluorocarbon inerting agents represented by the formulae C₂HCl₂F₃, C₂HClF₄, and C₃HCl₂F₅.

A stable suspension aerosol formulation of epinephrine is suitable for administration through inhalation comprising a therapeutically effective amount of epinephrine, hydrofluorocarbon propellant, co-solvent, surfactant, and antioxidant. The suspension aerosol formulation further comprises [pre-] pre-micronized epinephrine suspended in an alcohol/surfactant solution with hydrofluoroalkane propellant. The suspension formulation provides a highly efficient delivery of drug microparticles into the respirable region of patients' lungs and has the following advantages: lower dosage requirement, minimum alcohol content, with less impurities generated during storage, improved efficacy and safety, and exhibits no ozone depleting potential compared to a formulation containing chlorofluorocarbon.

A gas phase reaction process for producing a hydrofluorocarbon from a hydrochlorofluorocarbon or chlorofluorocarbon reactant by contacting, in the presence of a catalyst, the hydrochlorofluorocarbon or chlorofluorocarbon reactant with a reducing agent selected from methane, methyl chloride and mixtures thereof, to produce the hydrofluorocarbon.

The invention relates to a scroll compressor. When a freezing medium containing hydroflurocarbon (HFC) is used, fatty acid ester oil is used for smoothing. When a freezing medium containing hydrogen chlorofluorocarbon (HCFC) is used, fatty acid mineral oil is used for smoothing. A driving motor is a synchronous reluctance motor which is provided with a rotor comprising a plurality of flat laminated sheets. Each flat laminated sheet is provided with a plurality of magnetic flux barriers extending in directions of a circumference and a radius. An insulation film formed from a crystal plastic film is inserted between a winding and a motor stator, and the winding is formed from metal lines having an enamel coating. The characteristics cause the distortion of the driving motor to be reduced. In addition, the invention reduces wastage caused by the slippage of the driving motor, and reduces the heat wastage caused by the heat generation of the rotor.

Polymer extruded foams that contain cell size enlarging agents are provided. The inventive composition includes a foamable polymer material, at least one blowing agent, and at least one cell size enlarging agent. The blowing agent utilized in the inventive composition is preferably selected such that the composition has a zero ozone depletion and low global warming potential. Examples include any inorganic blowing agents and/or non-hydrogenated chlorofluorocarbons (non-HCFCs). The foamable polymer material is preferably polystyrene. The cell size enlarging agent may be chosen from ethylene vinyl acetate (EVA) and/or ethylene methyl acrylate (EMA). The cell size enlarging agent permits the formation of a foam with large cell sizes that are desirable to achieve a high insulation value and to optimize the physical properties of the foamed product. In addition, the cell size enlarging agent provides an increased cell size to the foamed product without detracting from the physical and thermal properties.

The invention discloses a cast polyurethane storage battery protection case and a manufacturing method thereof, and belongs to the technical field of storage battery protection. The manufacturing method comprises the following steps: by taking high temperature resistant inorganic hybridized melamine resin polyhydric alcohol or inorganic hybridized polyhydric alcohol etherified melamine resin, an emulsifier, a composite catalyst, a phosphate flame retardant, and a foaming agent such as water or sodium silicate as main raw materials, preparing compounded polyether, preparing a melamine polyurethane hard foamed material from the compounded polyether and polyisocyanate, and casting the melamine polyurethane hard foamed material between the inner shell and the outer shell of the storage battery protection case. The melamine polyurethane hard foamed material is free of low-boiling-point hydrocarbon compound or hydrogen chlorofluorocarbon compound, does not damage the ozone layer when being foamed with water, and is free of greenhouse effect, good in environment-friendliness, and excellent in flame retardancy, that is, the flame retardancy is improved by at least 20%, the oxygen index of the material is greater than 30%, the cast polyurethane storage battery protection case has functions of temperature insulation, flame retardancy, water resistance and battery protection, and problems that a vehicle-mounted battery protection case has high temperature, water leakage, flame retardancy and the like for a long time can be solved.

A process for large-scale production of CdTe/CdS thin film solar cell the films of the solar cells being deposited as a sequence on a transparent substrate, which comprises the steps of: depositing a film of a transparent conductive oxide (TCO) on the substrate; depositing a film of CdS on the TCO film; treating the CdTe film with Chlorine-containing inert gas; and depositing a back-contact film on the treated CdTe film. The Chlorine-containing inert gas is a Chlorofluorocarbon or a Hydrochlorofluorocarbon product and the treatment is carried out in a vacuum chamber at an operating temperature of 380-420° C. The Chlorine released as a result of the thermal dissociation of the product reacts with solid CdTe present on the cell surface to produce TeCl₂ and CdCl₂ vapors. Any residual CdCl₂ is removed from the cell surface by applying a vacuum to the vacuum chamber while keeping the temperature at the operating value.

Chlorofluorocarbon replacement solvents include a main component (first solvent) and a property-modification component (second solvent). The resulting solvent mixtures meet or exceed the solvency, flammability, and compatibility requirements for CFC's while providing similar or improved environmental and toxicological properties. These solvent mixtures can be used in conjunction with refrigeration or heat pumps, electronics, implantable prosthetic devices, oxygen systems, and optical equipment.

A method for the development or generation of pollution credits by the substitution of lower global warming potential (GWP) haloolefin compounds, preferably fluoroolefin compounds, for higher GWP compounds, such as perfluorocarbon compounds (PFC's), hydrofluorocarbon compounds (HFC's), chlorofluorocarbons (CFC's), hydrochlorofluorocarbon compounds (HCFC's), and the like, in compositions and processes employing or producing the higher GWP compounds, and receive allocation of pollution credits for such substitution.