Class 568/755 - Of halogen containing phenol

Subclass of Class 568 - Organic compounds -- part of the class 532-570 series
Definition: Processes wherein the compound separated contains halogen.
No. of patents: 35
Last issue date: 07/01/2003

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Number	Title	Issue Date
6586638	Process for removing and recovering of phenolic compounds from aqueous fluids There is provided a process for removing and recovering one or more unassociated phenolic compounds dissolved in aqueous fluid, the process comprising the steps of: (a) transferring the one or more unassociated phenolic compounds from the aqueous fluid to...	07/01/2003
5847236	Process for the preparation of 2-chloro-4-methylphenol 2-Chloro-4-methylphenol is prepared by reacting 4-methylphenol with a chlorinating agent in the presence of a catalyst system of one or more Lewis acids in a total amount of 0.1-10% by weight and one or more diaryl sulphides in a total amount of 0.1-10% b...	12/08/1998
5696302	Highly concentrated aqueous tribromophenolate solution and a method for preparing the same A highly concentrated aqueous tribromophenolate solution containing a non-hydrophillic solvent and a reducing agent is prepared by dissolving an alkali and a reducing agent in water, adding a non-hydropillic solvent and adding tribromophenol....	12/09/1997
5395994	Method for recovering methanol solvent This invention provides an environmentally acceptable method for recovery of phenolic and brominated phenolic compounds, alcohol solvent, and bromide values from the a reaction medium liquid mixture formed in the production of a tetrabromobisphenol-A pred...	03/07/1995
5196617	Method of hydrodehalogenating halogenated organic compounds in aqueous environmental sources A process for hydrodehalogenating halogenated organic compounds present in a contaminated aqueous environmental source in which the halogenated organic compounds are reacted with hydrogen gas or a source of hydrogen gas in the presence of a catalyst of pa...	03/23/1993
5177268	Hydrodehalogenation of aromatic compounds A process for hydrodehalogenating halogenated aromatics present in a contaminated aqueous environmental source in which the halogenated aromatics are reacted with hydrogen gas or a source of hydrogen gas in the presence of a basic proton acceptor and a ca...	01/05/1993
5124490	Removal of acids from phenol using anionic exchange resins Acid contaminants leached from acidic ion-exchange resins and carried in process streams with phenol are separated from the phenol by passing the process stream in contact with an anionic exchange resin, whereby the acid contaminants react with and bond t...	06/23/1992
4864065	Process for removing halogenated hydroxyaromatics from aqueous solutions The invention relates to a process for extracting halogenated hydroxyaromatics from aqueous solutions. In this process, the extractant used is an amine salt comprising an aliphatic amine having a total carbon number of 10 to 75 and a strong acid. The amin...	09/05/1989
4855053	Extraction of organic compounds from aqueous solutions Process for extracting organic compounds which are present in water in the form of solutions or suspensions by a liquid carboxylic acid which is immiscible with water. Branched or unbranched linear acids such as n-heptanoic, n-octanoic, or 2-ethylhexanoic...	08/08/1989
4822922	Stabilization of mixtures of chlorination of phenol/chlorophenols Mixtures produced by chlorination of phenol/chlorophenols are effectively stabilized by stirring same in the presence of a stabilizing amount of at least one strong protonic acid and/or a Lewis acid....	04/18/1989
4605791	Process for purification of technical grade pentachlorophenol Process for purification of technical grade pentachlorophenol by immersing the pentachlorophenol in an aqueous alkaline solution or suspension, separating an insoluble portion from the resultant mixture, dissolving the insoluble portion in an aqueous alka...	08/12/1986
4523041	Method of purifying 4-fluorophenol A method of efficiently purifying crude 4-fluorophenol containing phenol as impurity. Phthalic acid or its anhydride, or a suitable derivative of phthalic acid, and a dehydrating agent such as sulfuric acid or a metal chloride are mixed with the crude 4-f...	06/11/1985
4447541	Methods for decontaminating soil A reagent mixture is admixed with soil to first desorb and then hydrolyze and thereby increase the biodegradability of a toxic or otherwise hazardous polyhalogenated organic compound with which the soil is contaminated. Essential constituents of the reage...	05/08/1984
4431847	Method for removing brominated phenolic waste A process for forming a substantially insoluble solid polymer from halogeneated phenolic compounds dissolved in a liquid medium using an oxidizing agent. NaOCl and NaOBr are used as oxidizing agents to initiate the polymerization reaction among the haloge...	02/14/1984
4429168	Process for separating chlorinated phenols A process is disclosed for separating closely-boiling chlorinated phenolic compounds from other chlorinated and unchlorinated phenolics by treating a mixture of the phenolics with a metal halide salt. The metal halide salt preferentially forms a complex w...	01/31/1984
4421937	Crystal purification Mixtures of crystals and a liquid, ordinarily comprising the mother liquor of the crystals are continuously separated by feeding the mixture into a screw type press having drainage apperatures, thereby subjecting the crystals with the mother liquor entrap...	12/20/1983
4366329	Process for the separation of meta and para isomers of the sodium salt of bromophenol Disclosed is a novel process for the separation of meta and para isomers of the sodium salt of bromophenol. Derivatives of the sodium salt of metabromophenol are useful chemical intermediates....	12/28/1982
4327027	Chemical detoxification of toxic chlorinated aromatic compounds A method for the reduction of the content of toxic chlorinated aromatic compounds such as chlorinated aromatic dioxins and especially chlorinated dibenzo-p-dioxins in reaction products to virtually zero consisting essentially of reacting a mass containing...	04/27/1982
4294996	Method of reducing formation of chlorinated dioxins in manufacture of chlorinated phenols The invention covers the use of novel co-catalysts as inhibitors that reduce the formation of undesirable chlorinated dioxins during the preparation of pentachlorophenol and tetrachlorophenol from phenol or lower chlorinated phenols....	10/13/1981
4288296	Decomposition inhibitors for high temperature storage and distillation of chlorinated phenols The decomposition of chlorinated phenols, especially pentachlorophenol, during exposure to high temperatures (e.g., storage and distillation) is markedly reduced by incorporating into the molten chlorinated phenol at least about 0.25 percent by weight of ...	09/08/1981
4280012	Method of removing chlorinated phenol impurities A method of removing an impurity of the group chlorinated dibenzo-p-dioxins, chlorinated dibenzofurans, chlorinated hydroxydiphenylethers and chlorinated diphenylethers from a substance containing the same which comprises contacting said substance with an...	07/21/1981
4272636	Chlorinated phenol mold release agent In an improved process for preparing chlorinated phenol by the reaction of molten phenol with chlorine in the presence of a Friedel-Crafts catalyst, the improvement comprises adding to the molten chlorinated phenol product, immediately on completion of th...	06/09/1981
4228309	Cyclohexane extraction to remove chlorodibenzo-p-dioxins Chlorodibenzo-p-dioxin impurities are removed from a polychlorophenol that contains at least one chlorodibenzo-p-dioxin as an impurity by preparing an aqueous solution of a water-soluble alkaline salt of the polychlorophenol, mixing the aqueous solution w...	10/14/1980
4216342	Process for the purification of crude 2,4,5-trichlorophenol A novel process for the purification of 2,4,5-trichlorophenol which comprises selectively reacting the major impurities with formaldehyde....	08/05/1980
4160112	Process for the isolation of pentabromophenol A process for isolating crude pentabromophenol containing occluded bromine and hydrogen bromide as impurities comprising the steps of contacting the crude pentabromophenol with a strong acid such as hydrobromic acid, sulfuric acid, hydrochloric acid and p...	07/03/1979
4147872	3-[2-Hydroxy-4-(substituted)-phenyl]azacycloalkanes and derivatives thereof as analgesic agents and intermediates therefor Azacycloalkanes, and derivatives thereof, including unsaturated analogs, each of which has at the 3-position a 2-hydroxy-4-substituted phenyl group wherein the 4-position substituent is alkyl which can have an oxygen atom as part of the chain, or aralkyl ...	04/03/1979
4142943	Method for purifying pentachlorophenol The decomposition of pentachlorophenol during distillation to remove impurities is markedly reduced by incorporating into the distilling molten pentachlorophenol a hydroxyl or polyhydroxyl containing organic compound having a boiling point above about 100...	03/06/1979
4113974	Process for purifying impure diphenols A process for improving the quality of diphenols by recrystallization from aqueous solvent systems....	09/12/1978
4107443	Process for purifying impure diphenols A process for improving the quality of diphenols by recrystallization from aqueous solvent systems....	08/15/1978
4096175	Extraction method Covers a method of separating a nonionic surfactant from an anionic surfactant by use of methylal....	06/20/1978
4067913	Process for the production of 2,5-dichloro-4-bromophenol This invention discloses a process for the preparation of 2,5-dichloro-4-bromophenol which comprises reacting a mixture of 2,5-dichlorophenol and 2,4-dichlorophenol with about 0.9 to about 1.2 molar amounts of bromine per mole of 2,5-dichlorophenol and th...	01/10/1978
4058457	Recovery of activated carbon Activated carbon employed for removing weakly held contaminants such as organic chemicals from water, e.g., drinking water, can be recovered or regenerated by back flushing with iodine in water or an organic solvent and then the iodine recovered by reduci...	11/15/1977
4016047	Separation and recovery of polychlorinated phenols Polychlorinated phenols (e.g., pentachlorophenol) of improved color are made by vacuum distilling polychlorinated phenols containing dark color-forming impurities in the presence of a color inhibitor such as free radical-acting substances (e.g., free radi...	04/05/1977
3974084	Process for the manufacture of anhydrous alkali metal arylate solutions and separation of the arylates from alkali metal sulfite Anhydrous organic solutions of alkali metal arylates are prepared by dissolving an alkali metal arylate or reacting an arylhydroxy compound with alkali metal hydroxide in a ketone immiscible or incompletely miscible with water at room temperature and remo...	08/10/1976
3931001	Pentachlorophenol recovery with methylene chloride A method for removing antimicrobials such as pentachlorophenol from waste water by liquid-liquid extraction with a water immiscible organic liquid in a packed column; recovering the antimicrobial from the organic phase by distillation if desired; and, tre...	01/06/1976

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Class 568/755 - Of halogen containing phenol