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| Number | Title | Issue Date |
| 7405334 | Process for the reduction of acidic contaminates in fluorinated hydrocarbons The present invention relates to processes for reducing the concentration of acidic impurities HF, HCl, HBr, HI, HNO3 and H2SO4 in fluorinated hydrocarbons. The process involves: (i) contacting the fluorinated hydrocarbon with a phos... | 07/29/2008 |
| 7222546 | Method and apparatus for sediment characterization A method for characterizing contaminants within sediment comprising positioning a sampler in a continuous manner within the sediment, exposing the sampler to the sediment for a dwell time, retrieving the sampler, and analyzing the sampler. The sampler is exposed to ... | 05/29/2007 |
| 7112709 | Method for reusing heavy end by-products in the manufacture of polychlorinated alkanes A method for recovering much of the carbon and chlorine value in the heavy ends and other undesired by-products formed during the production of a C3 or higher polychlorinated alkane through the reaction of carbon tetrachloride with an olefine or chlorinat... | 09/26/2006 |
| 6987206 | Methods and materials for the preparation and purification of halogenated hydrocarbons Methods and materials are provided for the production and purification of halogenated compounds and intermediates in the production of 1,1,1,3,3-pentafluoropropane. In a preferred embodiment, the process steps include: (1) reacting carbon tetrachloride with vinyl ch... | 01/17/2006 |
| 6979754 | Method for obtaining polymerizable vinyl chloride from a raw product derived from the pyrolysis of 1,2-dichloroethane The invention concerns a method for obtaining directly polymerisable vinyl chloride which consists in subjecting a cooled raw product derived from of pyrolysis of 1,2-dichloroethane, to another cooling process at a temperature not more than 40° C., under pressure r... | 12/27/2005 |
| 6881872 | Less colored trans-1,3-dichloropropene and process for its production Less colored trans-1,3-dichloropropene and a process for producing it, are presented. A composition comprising cis-1,3-dichloropropene, trans-1,3-dichloropropene and C6 compounds, is subjected to a distillation step and to a step of reacting chlori... | 04/19/2005 |
| 6787678 | Method of removing water from hydrofluorocarbon manufacturing processes Disclosed are improved fluorination processes and fluorine-containing compositions which involve introducing to one or more fluorination process compositions a water reactive agent in an amount and under conditions effective to decrease the amount of water in that c... | 09/07/2004 |
| 6441257 | Process for the treatment of a cracking gas from the cracking of 1,2-dichloroethane In a process for the treatment of a cracking gas formed by pyrolysis of 1,2-dichloroethane (EDC), in which the cracking gas is split into its principal components hydrogen chloride (HCl), vinyl chloride (VCM) and unreacted 1,2-dichloroethane (EDC), and th... | 08/27/2002 |
| 6160189 | Reducing the monovinyl acetylene and/or butadiene content of impure vinyl chloride Monovinyl acetylene and/or butadiene are/is removed from impure vinyl chloride by contacting the impure vinyl chloride and substantially anhydrous hydrogen chloride with a catalyst system in which Lewis Acid is carried on an alumina substrate. The preferr... | 12/12/2000 |
| 6111152 | Method for separating vinyl chloride from a thermally decomposed product of 1,2-dichloroethane A method for separating vinyl chloride, which comprises cooling a cracked gas obtained by cracking 1,2-dichloroethane by a thermal cracking furnace, firstly in a heat exchanger, then further cooling it in a quenching tower and then distilling it, wherein ... | 08/29/2000 |
| 6103945 | Process for converting the low-boiling by-products formed during the thermal cracking of 1,2-dichloroethane Ethylene is chlorinated in a reaction zone to form a product stream containing 1,2-dichloroethane, the latter being then thermally cracked in a cracking zone to form vinyl chloride. Light by-products formed during the thermal cracking step are chlorinated... | 08/15/2000 |
| 5744669 | Process for the conversion of a halogenated organic stream containing trace quantities of organic nitrates A process for the conversion of a halogenated organic stream containing trace quantities of organic nitrates to produce a stream comprising hydrogenated hydrocarbonaceous compounds free from organic nitrates and halogenated organic compounds by means of c... | 04/28/1998 |
| 5731482 | Method for purifying perchloroethylene containing dichlorobutadiene Perchloroethylene containing contaminating amounts of dichlorobutadiene is treated with bromine, e.g., elemental bromine, in the presence of a free-radical initiator, thereby to produce perchloroethylene substantially-free of dichlorobutadiene and without... | 03/24/1998 |
| 5705721 | Dispersant for chloroprene unit fouling The present invention provides a method for inhibiting fouling deposits in chloroprene production units. The deposits are inhibited by addition to the chloroprene feedstock of an effective amount of a dispersant prepared in accordance with this invention.... | 01/06/1998 |
| 5600041 | Process for the selective removal of organic nitrates from a halogenated organic stream containing trace quantities of organic nitrates A process for treating a stream containing halogenated organic compounds and having trace quantities of organic nitrates to produce a stream comprising halogenated organic compounds free from organic nitrates by the utilization of a hydrogenation zone ope... | 02/04/1997 |
| 5558746 | Apparatus for quenching a gas stream in the production of vinyl chloride monomer A method and apparatus for quenching a gas stream in the production of vinyl chloride monomer includes the use of a knock back condenser and a plurality of column fractional distillation trays disposed within the quench column, and a liquid stream of 1,2-... | 09/24/1996 |
| 5507921 | Method for quenching a gas stream in the production of vinyl chloride monomer A method and apparatus for quenching a gas stream in the production of vinyl chloride monomer includes the use of a knock back condenser and a plurality of column fractional distillation trays disposed within the quench column, and a liquid stream of 1,2-... | 04/16/1996 |
| 5292973 | Phosphine oxide removal from compounds formed by a Wittig reaction An improvement is proposed for the removal of the precipitates of a phosphine oxide compound as a by-product from a mixture thereof with an olefin compound obtained by the Wittig reaction for the preparation of the olefin compound from a phosphorane compo... | 03/08/1994 |
| 5288929 | Method for removing, condensing and collecting propellants from foam materials A method for removing, condensing and collecting propellants, e.g. chlorofluoro-carbons (CFCs) in an environmentally friendly manner from foam materials, e.g. insulant materials from old (discarded) refrigerators, district heating tubes and other material... | 02/22/1994 |
| 5283383 | Antitumor compound, compositions and method of use The present invention relates to a new antitumor compound, a method for isolating same from a red alga, antitumor compositions containing same and methods of using same for treating patients with cancer. The compound of the present invention is 6(R)-... | 02/01/1994 |
| 5237114 | Removal of catalyst from chloroprene by treatment with oxy acid Quaternary ammonium phase transfer catalyst is removed from the dehydrochlorination product of 3,4-dichlorobutene-1 by treatment of the organic, chloroprene-containing phase with an oxy acid which combines with the catalyst to form a separate phase.... | 08/17/1993 |
| 5175381 | Process for recovering halogenated hydrocarbons from synthetic foams A method for recovering halogenated hydrocarbons (FCH) from synthetic foams wherein halogenated hydrocarbons (FCH) are released from synthetic foam in a hermetically sealed processing chamber and transferred to a gaseous carrier medium of steam. The steam... | 12/29/1992 |
| 5132474 | Method of recovering hydrocarbon halide The present invention provides a method of effectively recovering a hydrocarbon halide and the use of a specific aprotic polar compound for said method. Thus, the present invention provides a method of recovering a hydrocarbon halide comprising absorbing ... | 07/21/1992 |
| 5098525 | Process for disposing of residues deriving from the synthesis of chlorinated hydrocarbons The disposal of chlorinated pitches is carried out by a process which employs two treatments with an alcohol, which are carried out in cascade. Such treatments cause the precipitation of the suspended matter to take place. This is then caused to settle, and is... | 03/24/1992 |
| 5068474 | Process for the purification of vinyl chloride Process for the removal from vinyl chloride of compounds of ester type by an operation of treatment comprising an alkaline washing and a treatment with a hydride.... | 11/26/1991 |
| 5059730 | Process for the purification of vinyl chloride Process for the removal from vinyl chloride of compounds of the ester type by an operation of treatment comprising an alkaline washing and a treatment with a bisulphite.... | 10/22/1991 |
| 5043496 | Process for the treatment of heavy chlorination residues The present invention relates to a process for the treatment of heavy residues produced in the manufacture of chlorinated products, in which process a chemical compound chosen from certain fatty compounds is added to the heavy residues in order to form fl... | 08/27/1991 |
| 4822932 | Heat recovery in production of vinyl chloride by pyrolysis of dichloroethane In a method of treating the reaction product of pyrolysis of 1,2-dichloroethane to form vinyl chloride and hydrogen chloride with multiple stage cooling and distillation separation of the reaction product and recycle of unreacted 1,2-dichloroethane to the... | 04/18/1989 |
| 4788357 | Vinyl chloride production An improved method of producing vinyl chloride by pyrolysis of purified 1,2-dichloroethane at temperatures from 480° C. to 540° C. at a pressure of 10 to 36 bar absolute with partial utilization of the heat content of the flue gases from the pyrolysis f... | 11/29/1988 |
| 4760211 | Process for producing brominated acenaphthylene and its condensates A process for recovering brominated acenaphthylene and its condensate in the form of powder, comprising dropping a solution of brominated acenaphthylene and its condensate produced from acenaphthene by reactions of bromination, condensation and dehydrobro... | 07/26/1988 |
| 4760206 | Process for removing butadiene from vinyl chloride in a quench tower Ferric chloride (FeCl3), a known chlorination and polymerization catalyst for 1,3-butadiene ("BD"), can nevertheless be effectively used in a packed or trayed quench tower, operating under essentially anhydrous conditions, without plugging it. ... | 07/26/1988 |
| 4754087 | Process for the preparation of primary tertiary allyl halides Primary and/or tertiary allyl halides are prepared by reaction of a hydrogen halide (e.g. hydrogen chloride) with a terminal conjugated diene (e.g. myrcene, ଲ-farnesene, ଲ-springene or 15-chloro-ଲ-springene) in the presence of, as cataly... | 06/28/1988 |
| 4642400 | Process for finishing vinyl chloride monomer This process stems from the discovery that the solubility of water in vinyl chloride monomer ("VCM") is so low in a cold aqueous caustic solution at a temperature below 0° C., that the aqueous solution will remove water dissolved in the monomer, and at t... | 02/10/1987 |
| 4558167 | Hydrogen chloride-propylene separation Hydrogen chloride is recovered from a mixture with propylene by extractive distillation with an inert extraction solvent to minimize reaction between hydrogen chloride and propylene during such distillation. The temperature and pressure conditions are coo... | 12/10/1985 |
| 4358627 | Reducing chloride concentration A process for reducing the chloride concentration in a system which contains an ethylenically unsaturated chlorinated hydrocarbon, water and HCl which includes providing certain nitrogen-containing compounds in the system and contacting the system with a ... | 11/09/1982 |
| 4333799 | Purification and recovery of ethylene dichloride Ethylene dichloride is separated from unsaturated organic impurities such as trichloroethylene and benzene by extractive distillation in the presence of a high boiling chloroalkene solvent, such as perchloroethylene.... | 06/08/1982 |
| 4328376 | Method of removing fluorinated olefin byproduct formed during the synthesis of a fluorinated ether The method of removing fluorinated olefin byproduct formed during the synthesis of a fluoromethylhexafluoroisopropyl ether product or the like comprises: adding ammonia or an amine to the mixture to react with the fluorinated olefin byproduct, and thereaf... | 05/04/1982 |
| 4221659 | Process for reducing dichlorobutene contamination in aqueous plant wastes Chlorinated organic compounds from the aqueous waste streams from a process for manufacturing and isomerizing dichlorobutenes and dehydrochorinating 3,4-dichlorobutene-1 to chloroprene, which is the principal monomer in the manufacture of neoprene rubber,... | 09/09/1980 |
| 4188347 | Process for treating unreacted 1,2-dichloroethane from 1,2-dichloroethane cracking An improved process for removal of chloroprene from 1,2-dichloroethane recovered unconverted from the effluent of 1,2-dichloroethane pyrolysis. The chloroprene is chlorinated with chlorine in the presence of o- or m-cresol or a chlorinated derivative ther... | 02/12/1980 |
| 4170601 | Method for isolating insect sex pheromones The isomers of synthetic insect sex pheromones or their precursors are separated by selectively forming an inclusion complex with the E-isomer and urea or thiourea. In order for the E-isomer complex to form selectively it is necessry that the mono-olefin ... | 10/09/1979 |
