摘要:
The invention provides a process for the preparation of 1,1,2,3,3,4-hexafluorobutane by telomerization of chlorotrifluoroethylene to produce 1,1,3,4-tetrachlorohexafluorobutane followed by reduction of that compound to 1,1,2,3,3,4-hexafluorobutane.
摘要:
A method and composition for transforming a latent physiological biometric into a visible physiological biometric are provided, the method comprising: providing a latent biometric disposed on a surface of an article, wherein said biometric comprises at least one eccrine-derived compound; contacting said latent biometric with a developing solution, wherein said developing solution comprises at least one imaging reagent selected from ninhydrin and 1,8-diazafluoren-9-one and a carrier solvent comprising at least one C3-C4 hydrofluorocarbon; and reacting said imaging reagent with said eccrine-derived compound to produce a visible physiological biometric.
摘要:
The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to closed-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a non-amine catalyst used alone or in combination with an amine catalyst.
摘要:
Disclosed are heat transfer fluids which possess a highly desirable and unexpectedly superior combination of properties, and heat transfer systems and methods based on these fluids. The heat transfer fluid comprise from about 30 to about 70 percent, on a molar basis, of carbon dioxide (CO2) and from about 30 to about 70 percent, on a molar basis, of hydrofluorocarbon (HFC), preferably HFC having one to two carbon atoms, and even more preferably trans-1,1,1,3-tetrafluoropropene (HFC-32). The preferred fluids of the present invention have a vapor pressure of at least about 100 psia at 40?F and are also preferably not azeotropic.
摘要:
An azeotropic or azeotrope-like composition comprising a mixture of methyl iodide, 1-chloro-3,3,3,-trifluoropropene, and optionally one or more of fluorocarbons and/or hydrofluorocarbons. The compositions are present as a gas, at temperatures of about 30° C. or below. The inventive compositions serve as a non-ozone-depleting gaseous fumigant which is useful in a variety of applications, in place of methyl bromide. These compositions serve as a drop-in replacement for gaseous methyl bromide, providing the benefits of a methyl iodide fumigant while also utilizing existing methyl bromide equipment.
摘要:
The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to closed-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a non-amine catalyst used alone or in combination with an amine catalyst.
摘要:
A method and composition for transforming a latent physiological biometric into a visible physiological biometric are provided, the method comprising: providing a latent biometric disposed on a surface of an article, wherein said biometric comprises at least one eccrine-derived compound; contacting said latent biometric with a developing solution, wherein said developing solution comprises at least one imaging reagent selected from ninhydrin and 1,8-diazafluoren-9-one and a carrier solvent comprising at least one C3-C4 hydrofluorocarbon; and reacting said imaging reagent with said eccrine-derived compound to produce a visible physiological biometric.
摘要:
A method and composition for transforming a latent physiological biometric into a visible physiological biometric are provided, the method comprising: providing a latent biometric disposed on a surface of an article, wherein said biometric comprises at least one eccrine-derived compound; contacting said latent biometric with a developing solution, wherein said developing solution comprises at least one imaging reagent selected from ninhydrin and 1,8-diazafluoren-9-one and a carrier solvent comprising at least one C3-C4 hydrofluorocarbon; and reacting said imaging reagent with said eccrine-derived compound to produce a visible physiological biometric.
摘要:
Azeotropic and azeotrope-like compositions of methyl iodide and at least one fluorocarbon or hydrofluorocarbon such as 1,1,1,3,3-pentafluoropropane (HFC-245fa). The compositions are present as a gas, at temperatures of about 30° C. or below. The inventive compositions serve as a non-ozone-depleting gaseous fumigant which is useful in a variety of applications, in place of methyl bromide. These compositions serve as a drop-in replacement for gaseous methyl bromide, providing the benefits of a methyl iodide fumigant while also utilizing existing methyl bromide equipment.
摘要:
Disclosed is a process for producing fluoroalkene of the formula Rf—CH═CH2 from a fluorohaloalkene having the formula Rf—C(R1)═C(R2)H, wherein Rf is fluorine or a substituted or unsubstituted C1–C20 straight or branched-chain fluorinated alkyl and R1 and R2 are independently H, Cl, Br, or I, provided that at least one of R1 or R2 is Cl, Br, or I by reacting the fluorohaloalkene with a reducing agent, preferably a formate salt in the presence of a catalyst.