Class 549/87 - Plural chalcogens double bonded directly to ring sulfur of the hetero ring

Subclass of Class 549 - Organic compounds -- part of the class 532-570 series
Definition: Compounds wherein at least two chalcogens (i.e., oxygen,
No. of patents: 24
Last issue date: 10/30/2007

Number	Title	Issue Date
7288184	Process for mitigating acids in a system for separating aromatic hydrocarbons from a hydrocarbon feedstream Disclosed is a process for removing acids in a system in which aromatic hydrocarbons are separated from a mixture with aliphatic hydrocarbons. The aromatic hydrocarbons are extracted from the mixture using an extracting solvent. The aromatic hydrocarbons are strippe...	10/30/2007
6916938	Method for preparing sulfone or sulfoxide compound There is provided a method for preparing a sulfone or sulfoxide compound, characterized in that a sulfide compound is allowed to react with hydrogen peroxide in the presence of a metal oxide catalyst formed by the reaction of hydrogen peroxide with at least one meta...	07/12/2005
6034254	Sulfolane and process therefor A process for reducing the odor of sulfolane fluid comprises contacting the fluid with and oxidizing agent under conditions sufficient to effect the substantial reduction of odor in the fluid....	03/07/2000
5347018	Process for producing sulfolane compounds A process for producing sulfolane compounds is provided which comprises: (1) contacting a conjugated diene with sulfur dioxide under conditions sufficient to synthesize a sulfolene compound whereby a mixture of the sulfolene compound and impurities compri...	09/13/1994
5290953	Process for producing sulfolane compounds A process for producing sulfolane compounds is provided which comprises: (1) contacting a conjugated diene with sulfur dioxide under conditions sufficient to synthesize a sulfolene compound whereby a mixture of the sulfolene compound and impurities compri...	03/01/1994
5223101	Low color, low turbidity sulfolane Purification of crude sulfolane to remove color imparting and turbidity imparting impurities therefrom is achieved by a two-pass distillation process wherein purified sulfolane is withdrawn from the bottom of a column in the second distillation pass....	06/29/1993
5030737	Use of a solvent for hydrogenation of sulfolene to sulfolane A process for converting a sulfolene feed, containing contaminating amounts of sulfur dioxide, to a sulfolane product in which the sulfolene feed is dissolved in a solvent selected from the group consisting of alcohols and ketones having at least six carb...	07/09/1991
4975452	Geminally substituted thiaheterocyclic carboxylic acids and derivatives thereof Novel thromboxane receptor antagonists are disclosed, having the formula ##STR1## wherein: A is aryl, optionally substituted with halogen, lower alkoxy, carboalkoxy, lower alkyl, alkylamino, or phenyl; X is --CH2 or --NH; R1 is COOH, COO-...	12/04/1990
4861900	Purification and hydrogenation of sulfolenes A process for purifying sulfolene-containing streams, which contain polysulfones as impurities, comprises contacting the sulfolene-containing streams with activated carbon. The thus purified sulfolene-containing streams can be hydrogenated to sulfolane, e...	08/29/1989
4820849	Process for reducing corrosive impurities in sulfolane used for extracting aromatic hydrocarbons A process is disclosed for reducing the level of corrosive impurities in sulfolane solution originating from a process for the extraction of aromatic hydrocarbons from petroleum and having a pH of at least 8.5, comprises combining a sulfolane-soluble poly...	04/11/1989
4816071	Coating composition A coating composition comprising a film forming binder and an antifoulingly effective amount of at least one of 3,3,4, 4-tetrachlorotetrahydrothiophene-1,1,-dioxide and 3,3, 4-trichlorotetrahydrothiophene-1,1-dioxide as an effective ingredient is hig...	03/28/1989
4558138	Catalytic hydrogenation of sulfolenes A sulfolene compound, especially 3-sulfolene, containing dissolved sulfur dioxide as impurity is contacted with an oxidizing agent selected from the group of (a) peroxomonosulfuric acid, (b) peroxodisulfuric acid, (c) peroxomonosulfates and an acid having...	12/10/1985
4552970	Solvated salts of dinitrophenylcyanamides, and a process for the preparation thereof Compounds of the formula I ##STR1## in which X denotes hydrogen, fluorine, chlorine or bromine, Y and Z denote hydrogen, lower alkyl or lower alkoxy, M denotes sodium, potassium or one equivalent of calcium and L denotes a dipolar aprotic solvent, ar...	11/12/1985
4546110	Pheromones Compounds which are ଲ-farnesene derivatives obtainable as a Diels-Adler adduct of ଲ-farnesene and a dienophile or by a modification of such an adduct in a manner as defined herein are of value in pest control, particularly in the control of ap...	10/08/1985
4501902	N-Methyl pyrrolidone-2 purification A process for removing compounds from aprotic solvents in which aprotic solvent containing at least one acidic compound is contacted with a solid inorganic compound chosen from alkaline earth carbonates, alkaline earth hydroxides, alkaline earth oxides, a...	02/26/1985
4426331	Preparation of carbonate esters in the presence of sulfones A process for the oxidative carbonylation of an alcohol to produce a carbonate, which comprises reacting together carbon monoxide, oxygen and an alcohol, in the presence of a copper compound and in the presence of a sulfone....	01/17/1984
4286099	Sulfolene hydrogenation Prior to hydrogenation to produce sulfolane, a sulfolene feed containing sulfur-containing catalyst poisons is contacted with used and/or at least partially spent Raney nickel catalyst under conditions which substantially remove and/or render innocuous th...	08/25/1981
4275218	Sulfolene hydrogenation A process for converting sulfolene compounds to sulfolane compounds comprising contacting at least one sulfolene compound with hydrogen in the presence of a metal hydrogenation catalyst and an effective amount of ammonia as an SO2 neutralizer o...	06/23/1981
4256903	Polymer inhibition The formation of polysulfone polymer during the synthesis of sulfolenes from conjugated dienes and sulfur dioxide is reduced by the incorporation of a small, effective amount of a mono- and/or dialkenyl amine....	03/17/1981
4188327	Sulfolene hydrogenation A process for converting sulfolene compounds to sulfolane compounds comprising contacting at least one sulfolene compound with hydrogen in the presence of a metal hydrogenation catalyst and an effective amount of an SO2 neutralizer or scavenger...	02/12/1980
4187231	Cyanide-catalyzed isomerization and deuterium exchange with alpha- and beta-sulfolenes The alpha- and beta-sulfolenes can be converted to a mixture of the two and deuterated in the presence of cyanide ions....	02/05/1980
4172157	Aminoplast/alkyd coating composition This invention provides an acid-hardening resin composition which is activated by exposure to actinic light, wherein the composition is a condensation polymerizable blend of (1) an aminoplast, (2) an alkyd resin; and (3) a sulfolene catalyst. When the inv...	10/23/1979
3998845	Emulsion process for sulfolene and sulfolane products Sulfolene, a typical conjugated diene cyclic sulfone, is prepared by emulsifying butadiene in water in the presence of an antioxidant, and thereafter reacting the emulsion with sulfur dioxide under high pressure, for a period sufficient to complete reacti...	12/21/1976
3985770	Method of producing alkali metal tetracarbonylferrates and solvates thereof Production of alkali metal tetracarbonylferrates by reaction of alkali metal with an iron carbonyl, preferably iron pentacarbonyl, in a suitable solvent and in the presence of an electron carrier, the alkali metal being present in the liquid phase. Also, ...	10/12/1976

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Class 549/87 - Plural chalcogens double bonded directly to ring sulfur of the hetero ring