Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 7399890 | Method for the hydrodehalogenation of halogenated meta-cresols The present process serves for the hydrodehalogenation of halogenated meta-cresols of the formula (I) in which the R1 to R4 radicals are each as defined in the description, and is characterized in that... | 07/15/2008 |
| 7053251 | Bromination of hydroxyaromatic compounds A method for brominating hydroxyaromatic compounds to form products, such as p-bromophenol, is disclosed. The method uses elemental bromine as the brominating agent and comprises contacting a hydroxyaromatic compound with bromine and oxygen in the presence of metal ... | 05/30/2006 |
| 7045666 | Bromination of hydroxyaromatic compounds and further conversion to dihydroxyaromatic compounds Brominated hydroxyaromatic compounds such as p-bromophenol are prepared by contacting a hydroxyaromatic compound with oxygen and a bromine source such as hydrogen bromide or an alkali metal or alkaline earth metal bromide in an acidic medium, in the presence of elem... | 05/16/2006 |
| 7022886 | Selective catalytic oxybromination of hydroxyaromatic compounds A method for selectively brominating hydroxyaromatic compounds is disclosed. Hydroxyaromatic compounds are contacted with oxygen and a bromine source, in an acidic medium, in the presence of a catalyst selected from the group of compounds and mixtures of compounds o... | 04/04/2006 |
| 6982356 | Method for preparation of para-brominated hydroxyaromatic compounds A method for preparing hydroxyaromatic compounds brominated in the para-position, such as p-bromophenol, is disclosed. The method yields overall high process selectivity through isomeric equilibration and separation of the brominated products, thereby eliminating th... | 01/03/2006 |
| 6958423 | Bromination process This invention relates to a novel process which comprises feeding a mixture formed from diphenylethane and bromine to a stirrable reaction mass comprised of bromine and a bromination catalyst to yield a decabromodiphenylethane wet cake which can be most economically... | 10/25/2005 |
| 6815565 | Method for preparing hydroquinones and dihydroxybiphenyl compounds from mixtures of bromophenols and benzoquinones A method is described for the simultaneous preparation of p-bromophenols and p-benzoquinones, intermediates useful in the preparation of hydroquinones and 4,4′-dihydroxybiphenyls, respectively. Hydroquinones and 4,4′-dihydroxybiphenyls are useful monomers for th... | 11/09/2004 |
| 6740253 | Preparation of non-hazardous brominating reagents The present invention relates to a non-hazardous brominating reagent from an aqueous alkaline bromine byproduct solution obtained from bromine recovery plant and containing 25 to 35% bromine dissolved in aqueous lime or sodium hydroxide containing alkali bromide and... | 05/25/2004 |
| 6693221 | Method of preparing mixtures of bromophenols and benzoquinones A method is described for the simultaneous preparation of 4-bromophenols and p-benzoquinones, intermediates useful in the preparation of hydroquinones and 4,4'-dihydroxybiphenyls respectively. Hydroquinones and 4,4'-dihydroxybiphenyls are useful monomers ... | 02/17/2004 |
| 6313355 | Process for the preparation of tetrabromobisphenol-A Tetrabromobisphenol-A is produced in a bromination process where no bromine or only a very small proportion of bromine is fed to the reactor. In the process aqueous hydrobromic acid, is the sole source or a major source of the bromine. In the process ther... | 11/06/2001 |
| 6300527 | Process for the preparation of tetrabromobisphenol-A This invention relates, inter alia, to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A and/or underbrominated bisphenol-A, which process features: a water and water-miscible organic solvent reaction medium; a relati... | 10/09/2001 |
| 6265621 | Process for producing halogenated phenol compounds The present invention provides a process for producing a halogenated phenol compound represented by the general formula [II]: ##STR1## wherein Q is a monovalent organic residue, A is, the same or different, a hydrogen atom, halogen atom, --SO3 ... | 07/24/2001 |
| 6235946 | Process for the preparation of tetrabromobisphenol-A Tetrabromobisphenol-A is produced in a bromination process where no bromine or only a very small proportion of bromine is fed to the reactor. In the process aqueous hydrobromic acid, is the sole source or a major source of the bromine. In the process ther... | 05/22/2001 |
| 6218584 | Process for the preparation of tetrabromobisphenol-A This invention relates, inter alia, to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A and/or underbrominated bisphenol-A, which process features: a water and water-miscible organic solvent reaction medium; a relati... | 04/17/2001 |
| 6162953 | Process for the preparation of tetrabromobisphenol-A This invention relates to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A, which process features the addition of bisphenol-A to a reaction mass containing unreacted Br2 and 30 to 85 wt % water and an alc... | 12/19/2000 |
| 6084136 | Process for the preparation of tetrabromobisphenol-A This invention relates to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A, which process features: (a) feeding to a reaction mass (i) bisphenol-A and (ii) a stream of gaseous bromine, the gaseous stream having a Rey... | 07/04/2000 |
| 6084137 | Process for the preparation of tetrabromobisphenol-A This invention relates to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A, which process features the addition of bisphenol-A to a reaction mass containing unreacted Br2 and 30 to 85 wt. % water and an al... | 07/04/2000 |
| 6002050 | Process for the preparation of tetrabromobisphenol-A This invention relates to a process for the production of tetrabromobisphenol-A, which process features: a water and water miscible solvent reaction medium; a relatively high reaction temperature; and the presence, in the reaction medium, of unreacted Br | 12/14/1999 |
| 5907063 | Aromatic bromination process Activated aromatic compounds are more economically ring brominated by reacting the compounds with a sulfoxide/HBr brominating agent while removing water from the reaction mixture. The water removal provides high conversions and yields when employing stoic... | 05/25/1999 |
| 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 |
| 5817890 | Process for preparation of halogenated or pseudohalogenated cyclic organic compounds The present invention relates to new fluorinated hexane compounds corresponding to the following general formula (II): ##STR1## in which X'2, X'3, and X'4 are the same or different, and denote a halogen or a pseudohal... | 10/06/1998 |
| 5723690 | Process for the preparation of tetrabromobisphenol-A This invention relates to a process for the production of tetrabromobisphenol-A by the bromination of bisphenol-A, which process features: a water and water miscible solvent reaction medium; a relatively high reaction temperature; the presence, in the rea... | 03/03/1998 |
| 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 |
| 5484932 | Halogenation processes in advantageous solvents, and novel bistrifluoromethyl-polyfluoroalkoxybenzenes Compounds such as ##STR1## wherein R is F, CF3, CF2 H, CHF CF3 or CF2 CF3, as well as related compounds containing chlorine, are used as solvents in halogenation processes.... | 01/16/1996 |
| 5475153 | Process to produce tetrabromobisphenol with the reduced formation of alkyl bromide by-products A process for the preparation of 4,4'-isopropylidene bis(2,6-dibromophenol), also known as tetrabrombisphenol A, that dramatically reduces the formation of alkyl bromide by-products. Bisphenol A is brominated with a C3 to C5 n-alcoho... | 12/12/1995 |
| 5446212 | Reduced methyl bromide process for making tetrabromobisphenol-A A reduced methyl bromide process for making tetrabromobisphenol A in methanol, including: dissolving bisphenol-A in a methanol solvent to form a bisphenol-A methanol solution, adding bromine to the bisphenol-A methanol solution to brominate bisphenol-A an... | 08/29/1995 |
| 5426243 | Process for preparing 1,6-dibromo-2-naphthylene compounds An improved process for the preparation of 1,6-dibromo-2 -naphthol is disclosed. The improvement is accomplished by carrying out the reaction in an organic solvent at a temperature of from about 40° to about 60° C. in the presence of a catalytically-eff... | 06/20/1995 |
| 5387725 | Chlorination process, alkylation of products of said process and some products thereof Compounds having acidic protons and a molecular structure which can delocalize the electron density of the conjugate base (target compounds) are chlorinated by contacting such compounds with a perchloroalkane and aqueous base in the presence of a phase tr... | 02/07/1995 |
| 5283375 | Process for high purity tetrabromobisphenol-A This invention relates to a process for preparing a flame retardant product predominant in tetrabromobisphenol-A. The process comprises: (a) dissolving bisphenol-A in a methanol solvent containing up to about 5 weight percent water, wherein the ratio of m... | 02/01/1994 |
| 5149858 | Selective ortho-chlorination of phenols Phenolic compounds, notably admixtures of 2,4-dichlorophenol and 2,6-dichlorophenol, are selectively chlorinated at the ortho positions thereof, with gaseous chlorine and in a molten medium, in the presence of a selectivity-enhancing effective amount of a... | 09/22/1992 |
| 5059722 | Tetrabromobisphenol-A process Tetrabromobisphenol-A is made in high purity by adding a methanol-bromine solution to a methanol-bisphenol-A solution with vigorous agitation. Use of the bromine-methanol solution reduces the amount of by-products compared to the use of liquid bromine fee... | 10/22/1991 |
| 5053557 | Process for preparing 2-chloro-4-fluorophenol A process is disclosed for preparing 2-chloro-4-fluorophenol which comprises chlorinating 4-fluorophenol with a chlorinating agent in the presence of water. The process according to the present invention has advantages in that the chlorination can be carr... | 10/01/1991 |
| 5026926 | Chlorination of ortho-chlorophenol The polychlorophenols, e.g., 2,6-dichlorophenol (a known agrochemical intermediate), are effectively prepared by chlorinating ortho-chlorophenol with gaseous chlorine, optionally in the presence of other chlorophenols, characteristically in the molten sta... | 06/25/1991 |
| 5017728 | Tetrabromobisphenol-A process Tetrabromobisphenol-A is made in high purity and increased yield by adding a methanol-bromine solution to a methanol bisphenol-A solution with vigorous agitation. The amount of methanol in the reaction vessel is adjusted to yield a ratio of tetrabromobisp... | 05/21/1991 |
| 4997946 | Process for the iodination of hydroxyaromatic and aminoaromatic compounds A method of iodinating hydroxyaromatic and aminoaromatic compounds is disclosed, comprising reacting the hydroxyaromatic or aminoaromatic compound with an aqueous solution of a metal iodide and a metal hypochlorite at a temperature about -100° to 100° C... | 03/05/1991 |
| 4954662 | Selective chlorination of ortho-substituted phenols Ortho-substituted phenolic compounds, e.g., 2,6-dichlorophenol, are selectively chlorinated, e.g., into 2,4,6-trichlorophenol, with gaseous chlorine in either the molten state or in a solvent medium, in the presence of a selectivity-enhancing effective am... | 09/04/1990 |
| 4940807 | Selective bromination of aromatic compounds using potassium tribromide Electron-rich aromatic compounds are selectively brominated in good yield in the presence of water using potassium tribromide as the brominating agent. In this way monobromination is favored and dibromination is suppressed as compared to the use of elemen... | 07/10/1990 |
| 4885408 | Chlorination of ortho-substituted phenols The ortho-substituted phenols, e.g., 2,6-dichlorophenol, are reacted with gaseous chlorine, in the presence of a catalytically effective amount of a strong or Lewis acid, to produce, e.g., a more pure 2,4,6-trichlorophenol in good yield.... | 12/05/1989 |
| 4876396 | Selective chlorination of phenols Phenolic compounds and mixtures thereof, e.g., admixture of 2,4-dichlorophenol and 2,6-dichlorophenol, are selectively chlorinated at a position ortho to a hydroxyl function thereof, by reacting such phenolic compound with gaseous chlorine, in a molten re... | 10/24/1989 |
| 4855513 | Chlorination of phenolic compounds The chlorophenols, e.g., 2,4,6-trichlorophenol, are efficiently prepared by chlorinating an ortho-/para-substituted phenolic compound with gaseous chlorine, whether in molten state or in a solvent reaction medium, in the presence of a catalytically effect... | 08/08/1989 |
