| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 568717000 | Polyphenols | 35 |
| 20080200734 | CRYSTALLIZATION PROCESSES FOR PRODUCING BISPHENOLS - Processes for producing bisphenols (e.g., bisphenol A (BPA)) having a purity greater than 99.7% are described, such processes including reacting a phenol and acetone in the presence of an acidic catalyst to form a product mixture comprising a bisphenol; removing at least a portion of the bisphenol from the product mixture in the form of a bisphenol/phenol adduct by crystallization, filtration and washing to provide bisphenol/phenol adduct crystals; and removing at least a portion of the phenol from the bisphenol/phenol adduct crystals to provide the bisphenol having a purity of more than 99.7%; wherein the crystallization comprises continuous suspension crystallization and is carried out in at least three crystallization devices arranged such that the product mixture is first cooled in a first stage of the crystallization to a temperature of 50 to 70° C. in a first crystallization device and a second crystallization device connected in parallel, and subsequently cooled in a second stage of the crystallization to a temperature of 40 to 50° C. in a third crystallization device connected downstream in series to the first and second crystallization devices, and wherein a total dwell time of the product mixture in the crystallization is more than 4 hours. | 08-21-2008 |
| 568718000 | Three or more rings containing | 14 |
| 20090076314 | Bisphenol compound and process for preparation thereof - The present invention provides a novel bisphenol compound of formula (I). | 03-19-2009 |
| 568719000 | Polycyclo ring system | 4 |
| 20110201845 | PROCESS FOR PRODUCING TRIPHENYLENE COMPOUND AND CRYSTAL OBTAINED BY THE PROCESS - An object of the present invention is to provide a process for producing high-purity hydroxytriphenylenes in which not only inexpensive raw materials can be used but also no complicated steps of deprotection such as dealkylation, and reduction and the like are necessary, and which is thereby advantageous in industrial production. Also there is provided a novel crystal of 2,3,6,7,10,11-hexahydroxytriphenylene monohydrate, which has satisfactory thermal stability. The process for producing a compound represented by the general formula (2) is characterized by reacting a compound represented by the general formula (1) in the presence of a metal oxide comprising a metal selected from trivalent iron, pentavalent vanadium and hexavalent molybdenum and of a nonvolatile strong acid: | 08-18-2011 |
| 20100191020 | PROCESS FOR PRODUCING TRIPHENYLENE COMPOUND AND CRYSTAL OBTAINED BY THE PROCESS - An object of the present invention is to provide a process for producing high-purity hydroxytriphenylenes in which not only inexpensive raw materials can be used but also no complicated steps of deprotection such as dealkylation, and reduction and the like are necessary, and which is thereby advantageous in industrial production. Also there is provided a novel crystal of 2,3,6,7,10,11-hexahydroxytriphenylene monohydrate, which has satisfactory thermal stability. The process for producing a compound represented by the general formula (2) is characterized by reacting a compound represented by the general formula (1) in the presence of a metal oxide comprising a metal selected from trivalent iron, pentavalent vanadium and hexavalent molybdenum and of a nonvolatile strong acid: | 07-29-2010 |
| 20100185022 | PROCESSES FOR THE PREPARATION OF CALIXARENE DERIVATIVES - A method for the preparation of calix[n]arene derivatives, in particular phosphonated calix[n]arenes. The present invention also relates to nano-structures of phosphonated calix[n]arenes. | 07-22-2010 |
| 20130150627 | PURIFICATION METHOD FOR CYCLIC COMPOUND - An industrially advantageous purification method for a cyclic compound with a particular structure is provided. | 06-13-2013 |
| 568720000 | Three or more phenols containing | 9 |
| 20120010433 | DEVICE AND PROCESS FOR SOLID/LIQUID SEPARATION OF SOLID-LIQUID SUSPENSIONS - In a device and a process for continuous solid/liquid separation (filtration) of solid-liquid suspensions on moving filters, for example on rotating drum filters or belt filters, the active filtering layer contains a woven fabric material composed of synthetic fibres, which has an enhanced filtrate permeability and also an enhanced thermal stability with improved dimensional stability, and also improved mechanical strength compared with polypropylene fibres. | 01-12-2012 |
| 20100249466 | THERMAL RECORDING MATERIAL CONTAINING TRIS(2-METHYL- 4-HYDROXY-5-t-BUTYLPHENYL)BUTANE - A thermal recording material of the invention contains, as a storability improver, tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane trapping and containing water and/or methanol and having a crystal structure that shows a maximum X-ray diffraction peak at a diffraction angle 2θ of 6.58° according to X-ray diffraction measurement using an X ray having a wavelength of a Cu—Kα line. The recording material has improved heat resistance in non-printing sections while maintaining the moisture-and-heat resistance in printing sections. The thermal recording material of the invention has a thermal-recording layer that contains the tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane in an amount of preferably 0.1 to 15% by mass with respect to the thermal-recording layer. The amount of the water and/or methanol trapped and contained in the tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane is preferably 0.1 to 10% by mass in total. | 09-30-2010 |
| 20120108854 | GREEN AND ATOM-ECONOMICAL PROCESSES FOR PRODUCING PHENOLIC ANTIOXIDANTS - Processes for producing 1,3,5-trimethyl-2,4,6-tris(3,5-dialkyl-4-hydroxybenzyl)benzene are provided, in particular such processes that utilize 2,6-di-tert-butylphenol, paraformaldehyde, a secondary amine, mesitylene, and acetic acid. | 05-03-2012 |
| 20120108853 | METHOD FOR PRODUCING TRISPHENOLS AND MONOESTER-SUBSTITUTED PRODUCTS THEREOF, AND 4-ACYLARALKYLPHENOL DERIVATIVES - Trisphenols of general formula (1), which are useful as starting materials for polymer, are industrially easily produced by a method using as a starting material 4-aralkylphenol derivatives expressed by general formula (2): | 05-03-2012 |
| 20110251438 | PURIFICATION OF TRIS-HYDROXYARYL COMPOUNDS - The present invention is directed to a composition comprising a tris-hydroxyaryl compound having a metal ion impurity content of less than 10 ppm and to a process for the purification of tris-hydroxyaryl compound having a metal ion impurity, comprising at least the following steps:
| 10-13-2011 |
| 20080214876 | Process for Preparation of Pharmaceutically Pure Anhydrous Calcipotriol - A process for the preparation of a pharmaceutical-grade anhydrous calcipotriol comprising: (a) dissolving crude calcipotriol having a water content of X % by weight in a first solvent or in a mixture of two or more first solvents, said first solvent or said mixture of two or more first solvents forming an azeotropic system with water, to obtain a solution of crude calcipotriol; (b) obtaining an intermediate calcipotriol by (i) placing said solution of crude calcipotriol under a reduced pressure and evaporating, if X is greater than or equal to 1, or (ii) crystallizing, if X is lower than 1; and (c) re-dissolving said intermediate calcipotriol in a second solvent or a mixture of two or more second solvents, said second solvent being anhydrous, and crystallizing at least once to obtain pharmaceutical-grade anhydrous calcipotriol. | 09-04-2008 |
| 20120220805 | NOVEL TRISPHENOL COMPUND - A trisphenol compound is expressed by formula (1), wherein R represents an alkyl group or alkoxyl group with 1 to 8 carbon atoms, phenyl group or hydroxyl group; R | 08-30-2012 |
| 20120277479 | NOVEL POLYNUCLEAR POLY(PHENOL) FAMILY - Provided is a polynuclear poly(phenol)family represented by general formula (1). In general formula (1), R | 11-01-2012 |
| 20130150628 | PHARMACEUTICAL COMPOSITION COMPRISING A CURCUMIN DERIVATIVE - The present invention is directed to a pharmaceutical composition comprising: | 06-13-2013 |
| 568722000 | Two phenols bonded directly to the same carbon | 17 |
| 568723000 | Identical phenols | 17 |
| 20100010273 | PROCESS FOR PRODUCING BISPHENOL-A - A process for preparing 2,2-bis(4-hydroxyphenyl)propane (p,p-bisphenol-A) from 2,4,4-trimethyl-2-(4-hydroxyphenyl)chroman (chroman 1.5) is disclosed. Phenol and chroman 1.5 are contacted over an acidic ion exchange resin at a given temperature for a given period of time. The process results in improved quality of p,p-bisphenol-A, better performance of catalyst, improved raw material usage, and reduced waste. | 01-14-2010 |
| 568724000 | Purification or recovery | 5 |
| 20110112333 | BPA PROCESS IMPROVEMENT - The present disclosure enables phenol recovery, purification and recycle in a simple, economic manner from waste streams from, for example, a phenol/acetone production process, e.g., a phenol/acetone plant or an upstream cumene hydroperoxide cleavage process step, and BPA production step, for use in the reaction with acetone to produce BPA. The disclosure therefore reduces the overall consumption of phenol in the production of BPA. | 05-12-2011 |
| 20080281130 | PROCESS FOR PRODUCING BISPHENOL A WITH AN EXTENDED SERVICE LIFE IN THE CRYSTALLISATION - The invention describes a process for producing bisphenol with a content of less than 15 wt. % of phenol, wherein a suspension crystallisation of a product mixture containing bisphenol A, minor components and phenol is performed in a crystalliser, the product mixture being pumped through a heat exchanger. Due to deposition (fouling, i.e. crystallisation and deposition on the surface of the heat exchangers) in the heat exchanger, the pressure difference increases from 0.5 to 3 bar across the heat exchanger. The resulting reduced flow rate, which would lead to increased fouling in the crystalliser, is offset by continuously increasing the speed of the pump, the pump speed being regulated in such a way that the current consumption of the pump is maintained such that it fluctuates by a maximum of 5%. | 11-13-2008 |
| 20080281129 | BPA Process Improvement - The present disclosure enables phenol recovery, purification and recycle in a simple, economic manner from waste streams from, for example, a phenol/acetone production process, e.g., a phenol/acetone plant or an upstream cumene hydroperoxide cleavage process step, and BPA production step, for use in the reaction with acetone to produce BPA. The disclosure therefore reduces the overall consumption of phenol in the production of BPA. | 11-13-2008 |
| 20080306310 | AVOIDANCE OF SOLIDS DEPOSITS IN DROPLET SEPARATORS BY METERING IN SUITABLE LIQUIDS - The present invention relates to a process for the avoidance of solids deposits in droplet separators (demisters) by metering in suitable liquids, in particular in the production of bis(4-hydroxyaryl)alkanes. | 12-11-2008 |
| 20090221858 | Bisphenol-A Plant Yield Enhancement - An improved process is provided for producing bisphenol-A (BPA) comprising steps of (1) contacting benzene and a C | 09-03-2009 |
| 568726000 | Halogen containing | 1 |
| 20100010274 | Process for the Preparation of Tetrabromobisphenol A - A process for preparing tetrabromobisphenol A, which comprises: i) reacting bisphenol A and bromine in dichloromethane in the presence of aqueous hydrogen peroxide at a temperature in the range of room temperature to the reflux temperature, wherein said dichloromethane is present in an amount sufficient for substantially dissolving brominated derivatives of said bisphenol A formed thereby, ii) separating the substantially solid-free reaction mixture obtained in step i) into aqueous and organic phases, precipitating tetrabromobisphenol A from the organic phase and isolating said precipitated tetrabromobisphenol A from said organic phase. | 01-14-2010 |
| 568727000 | Preparing from a phenol and an aldehyde or ketone | 10 |
| 20100305365 | REGENERATION OF ACIDIC ION EXCHANGERS - The invention relates to a method for regenerating acidic cation exchangers, which are used as catalysts in the reaction of phenols with aldehydes or ketones to give bisphenols, in particular to give bisphenol A, with acids, with the proviso that, in the method according to the invention, these cation exchangers experience very little mechanical damage due to swelling processes during the regeneration process. | 12-02-2010 |
| 20120010434 | PROCESS FOR PRODUCING BISPHENOL COMPOUND - Provided is a process for producing a bisphenol compound stably at a high conversion and with high selectivity over a long period. A process for producing a bisphenol compound by feeding a phenol compound and a carbonyl compound continuously to a reactor packed with an acid catalyst, characterized in that the acid catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds. | 01-12-2012 |
| 568728000 | Isopropylidene diphenol produced | 8 |
| 20090137848 | PROCESS FOR THE MANUFACTURE OF POLYPHENOLS - An improved process for the manufacture of a polyphenol compound such as bisphenol-A by introducing into a reaction zone a phenolic compound reactant, a carbonyl compound reactant, and a catalyst promoter comprising bismethylthiopropane added to the reaction system in certain specific locations, and reacting the ingredients within the reaction zone in the presence of an acid catalyst. | 05-28-2009 |
| 20110092744 | PROCESS FOR PRODUCING BISPHENOL A - The present invention provides a process for producing bisphenol A by reacting phenol with actone, wherein reaction is performed at higher temperatures while maintaining high selectivity, and thus high productivity is obtained. The invention relates to a cation-exchange resin, wherein a cation-exchange group is introduced into a syndiotactic polystyrene polymer and the amount of acid is 0.8 milliequivalent/g or more, to a catalyst comprising the cation-exchange resin, and to a process for producing bisphenol A using a cation-exchange resin catalyst. | 04-21-2011 |
| 20080319237 | Method for Stabilizing a Cation Exchange Resin Prior to Use as an Acid Catalyst and Use of Said Stabilized Cation Exchange Resin in a Chemical Process - A method for preventing the degradation of a catalyst during storage of the catalyst and prior to using the catalyst in a chemical process comprising treating the catalyst with an antioxidant and storing the treated catalyst until further use. The stabilized treated catalyst may be used in a process for producing organic chemicals such as in a process for producing bisphenol A. | 12-25-2008 |
| 20100324341 | MODIFIED ACIDIC ION-EXCHANGE RESIN AND METHOD FOR PREPARING BISPHENOL - The present invention provides an ion-exchange resin catalyst, as a catalyst for preparing bisphenol from phenol compounds and ketone, which has a higher selectivity to bisphenol and a longer life time, as compared to a conventional ion-exchange resin, and a method for preparing the same. | 12-23-2010 |
| 20110137087 | METHOD OF REDUCING METHANOL IN RECYCLE STREAMS IN BISPHENOL-A PRODUCTION PROCESS - Methods for removing methanol from acetone recycle streams during bisphenol-A production, thereby avoiding the deactivation of catalyst, by distilling an acetone-methanol-water comprising mixture such that acetone is taken overhead in form of a relatively pure distillate, and substantial portions of the methanol and the water are leaving with the bottom product. | 06-09-2011 |
| 20110152578 | METHOD FOR STABILIZING A CATION EXCHANGE RESIN PRIOR TO USE AS AN ACID CATALST AND USE OF SAID STABILIZED CATION EXCHANGE RESIN IN A CHEMICAL PROCESS - A method for preventing the degradation of a catalyst during storage of the catalyst and prior to using the catalyst in a chemical process comprising treating the catalyst with an antioxidant and storing the treated catalyst until further use. The stabilized treated catalyst may be used in a process for producing organic chemicals such as in a process for producing bisphenol A. | 06-23-2011 |
| 20120283485 | ROBUST PROMOTER CATALYST SYSTEM - A modified ion exchange resin catalyst having an attached dimethyl thiazolidine promoter is disclosed. Also disclosed is a process for catalyzing condensation reactions between phenols and ketones, wherein reactants are contacted with a modified ion exchange resin catalyst having an attached dimethyl thiazolidine promoter. Also disclosed is a process for catalyzing condensation reactions between phenols and ketones that does not utilize a bulk promoter. | 11-08-2012 |
| 20120283484 | PROMOTER CATALYST SYSTEM WITH SOLVENT PURIFICATION - Methods for performing a condensation reaction are disclosed. Specifically, various methods for the production of highly-pure bisphenol-A are disclosed in which an attached promoter ion exchange resin catalyst system is combined with a solvent crystallization step. | 11-08-2012 |
| 568729000 | Two phenols bonded directly to two different carbons of an acyclic chain | 1 |
| 20100324342 | PROCESS FOR THE SYNTHESIS OF POLYHYDROXYSTILBENE COMPOUNDS - The invention relates to a process for the synthesis of stilbene derivatives of formula (I)-(E) or (I)-(Z) | 12-23-2010 |
| 568730000 | Two phenols bonded directly to each other | 2 |
| 20100099922 | PROCESS FOR MAKING 2-SECONDARY-ALKYL-4,5-DI-(NORMAL-ALKYL)PHENOLS - The invention relates to the preparation of alkylated phenols. More specifically, the invention relates to an improved process for the manufacture of 2-secondary-alkyl-4,5-di-normal-alkylphenols. | 04-22-2010 |
| 20100280284 | OPTICALLY ACTIVE 2,2'-BIPHENOL DERIVATIVE AND PRODUCTION METHOD OF SAME - An optically active 2,2′-biphenol derivative and a production method that enables simple and efficient production of this compound. More specifically, an optically active biphenol derivative represented by the following formulas (1) and (2), a method for optically resolving a biphenol derivative represented by formula (2′), a production method of an optically active biphenol derivative (1) comprising a step for reacting a Brønsted acid with a biphenol derivative (2), and a production method of an optically active biphenol derivative (3) comprising a step for reacting a Lewis acid with an optically active biphenol derivative (1) or an optically active biphenol derivative (2). In the following formulas, R represents, for example, a primary or secondary alkyl group having 1 to 10 carbon atoms, * represents an axially asymmetric center, X represents a halogen atom, and R | 11-04-2010 |
