Class 568/750 - From mixture of phenols

Subclass of Class 568 - Organic compounds -- part of the class 532-570 series
Definition: Processes wherein the phenols are separated from a mixture
No. of patents: 83
Last issue date: 04/08/2008

«First «Previous1 2 3 Next»Last»

Number	Title	Issue Date
7355082	Method of purifying long-chain alkyl phenols and Mannich adducts thereof A process for purifying a phenol derivative selected from alkylphenols having a number average molecular weight of from 200 to 4 000 and Mannich adducts thereof is described, in which the phenol derivative is brought into intimate contact with an extracting agent ha...	04/08/2008
7078579	Process for the isomerization of a vinylidene olefin A process for the double bond isomerization of a vinylidene olefin, comprising contacting a feed comprising the vinylidene olefin with an isomerization catalyst which comprises a molecular sieve in an acidic form, which molecular sieve comprises pores which have a p...	07/18/2006
7067704	Process for purifying bisphenol-a Bisphenol-A is purified in a process which comprises the following steps: a) cooling a liquid mixture comprising bisphenol-A and water in a bisphenol-A crystallizer to form bisphenol-A crystals in a liquid phase; b) separating the bisphenol-A crystals from the liqui...	06/27/2006
7041865	Process for the isomerization of an olefin A process for the double bond isomerization of an olefin, which process comprises contacting a feed comprising the olefin with an isomerization catalyst, wherein prior to contacting the feed with the isomerization catalyst one or more components of the feed are pret...	05/09/2006
6600004	Method of preparing polyestercarbonates A method of preparing polyestercarbonates is presented in which a mixture of at least one activated diaryl carbonate is reacted under melt polymerization conditions with at least one aromatic dihydroxy compound together with at least one dicarboxylic acid...	07/29/2003
6576801	Process for the neutralization of residual acid species in crude dihydric phenols The present invention relates to a method of neutralizing residual acid species in crude dihydric phenol comprising the step of introducing a thermally stable organic base selected from the group consisting of tetraalkyl phosphonium hydroxides, tetraorgan...	06/10/2003
6414106	Process for the neutralization of residual acid species in crude dihydric phenols The present invention relates to a method of neutralizing residual acid species in crude dihydric phenol comprising the step of introducing a thermally stable organic base selected from the group consisting of tetraalkyl phosphonium hydroxides, tetraorgan...	07/02/2002
6258901	Process for producing lightly colored p-vinylphenol polymer There is provided a process for efficiently and economically producing a polymer which is superior in transmittances of visible light and far-ultraviolet light, has a high molecular weight and is light-colored. A process for producing a light-colored viny...	07/10/2001
6184367	Process for the production of 4-aryl-2 butanols from Taxus wallichiana The present invention provides a process for the production of two molecules of 4-aryl-2 butanols having the general formula 1 given below: ##STR1## Wherein R.dbd.H or glucose from the leaves of Taxus wallichiana, which comprises: (a) defatting air dried,...	02/06/2001
6150566	Separation and purification method of xylenol isomer At least one xylenol isomer can be separated and purified from a mixture, which contains the specific xylenol isomer and at least one organic substance other than the specific xylenol isomer, by bringing the mixture into contact with 1,1-di(4-hydroxypheny...	11/21/2000
6120653	Separation and purification method of t-butyl-methylphenol isomer A method is provided for industrially advantageously and effectively separating 4M2B and 3M6B from a t-butylcresol mixture containing 2-t-butyl-4-methylphenol (4M2B), 2-tbutyl-5-methylphenol (3M6B), compounds having a lower boiling point than that of 4M2B...	09/19/2000
6066767	Method of purifying cumene hydroperoxide decomposition products from hydroxyacetone and from other carbonyls Purification of cumene hydroperoxide cleavage products from hydroxyacetone and carbonyl compounds is accomplished via extraction of hydroxyacetone and carbonyl compounds from cleavage products with a circulating water-salt solution in an extractor during ...	05/23/2000
6025530	Phenol tar cracking process The present invention relates generally to a method for treating phenol tar, and, more particularly to a method for separating valuable products from phenol tar by treating the tar with steam....	02/15/2000
5750009	Method for purifying natural cresylic acid mixtures A process for the purification of natural cresylic acid feedstocks which are first depitched. The depitched feedstock is extractively distilled with a polyhydric alcohol, preferably triethylene glycol, to remove virtually all neutral oil species which are...	05/12/1998
5744654	Recovery of para-ethylphenol A process for separating and recovering para-ethylphenol from methyl-ethylphenol and other alkyl phenols is described using an X zeolite adsorbent having ion exchangeable sites exchanged with barium ions, potassium ions or a mixture of barium and potassiu...	04/28/1998
5705039	Process for purifying a 2,6-dialkylphenol Impure 2,6-diisopropylphenol (DIP) is purified by use of a distillation process in which a single distillation column is used. The process comprises: (a) subjecting the impure DIP to a first continuous distillation in the column in an inert environment to...	01/06/1998
5696300	Propofol purification Propofol is purified by reaction of the raw 2,6-diisopropylphenol with an alkaline agent, by isolation of the alkaline metal salt and by neutralization thereof. There is thus obtained a propofol having a purity of at least 99.90%....	12/09/1997
5679223	Method for separating and purifying catechol mixtures An extractive distillation process using a high boiling polyol such as glycerol is employed for separating high purity catechol, 3-methylcatechol and 4-methylcatechol from a high boiling, pitch-like dihydric phenol fraction. Fractional distillation first ...	10/21/1997
5672774	Phenol tar processing method Valuable products are recovered from phenol tar by thermocracking under controlled conditions in the presence of polyphosphoric acid. Bisphenol A tars can be optionally cracked under these conditions mixed with the phenol tar and enhanced yields obtained....	09/30/1997
5589598	Process of purification of 2,6-diisopropylphenol A process for the purification of 2,6-diisopropylphenol (Propofol) by transformation of the crude Propofol into its ester with a carboxylic or sulphonic acid, crystallization and hydrolysis, is described....	12/31/1996
5491268	Process for removal of acidic compounds from phenol process streams A process for purifying phenol, phenol-type compounds, and substituted phenol and phenol-type compounds of contamination by components more acidic than the phenol component comprising treating a phenol containing process stream by contacting the stream wi...	02/13/1996
5254750	Removal of guaiacol from cresylic acid by heating with a strong base A process is described for the removal of guaiacol and substituted guaiacols from naturally occurring cresylic acid feed by heating the feed with a strong base, particularly sodium hydroxide, to produce a purified cresylic acid product essentially free of...	10/19/1993
5202505	Purification of hydroxyphenyl alkanes Crude hydroxyphenylalkane, e.g., 1,1,1-tris(4'-hydroxyphenyl)ethane, is purified, to reduce color and prevent caustic solution turbidity, (a) by contacting the hydroxyphenylalkane in alcoholic solution with an alkali metal dithionite, preferably in the pr...	04/13/1993
5177269	Removal of guaiacol from cresylic acid feedstreams by heating with a strong acid A process is described for the removal of guaiacol from naturally occurring cresylic acid feed by heating the feed with a strong acid, particularly hydrochloric acid or sulfuric acid, to produce a purified cresylic acid product essentially free of guaiaco...	01/05/1993
5171895	Removal of guaiacol from cresylic acid feedstreams Purification of cresylic acid by guaiacol removal from lignite-based feed as well as other naturally occurring sources of cresylic acid is accomplished by catalytic demethylation in the presence of an alumina catalyst. In the process of this invention, de...	12/15/1992
5149887	Separation of alkyl-substituted phenolic isomers with barium-potassium exchanged zeolitic adsorbent A process for the coextraction of para-cresol and meta-cresol from a feed mixture comprising p-cresol, o-cresol and m-cresol and one other alkyl phenol with an adsorbent comprising an X zeolite exchanged with barium ions or a mixture of barium and potassi...	09/22/1992
4942265	Process for preparing 2,2-bis(4-hydroxyphenyl)propane of high purity The process for preparing 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) by reacting acetone with phenol and decomposing the resultant adduct of bisphenol A and phenol is well known. However, the quality of bisphenol A thus obtained is not always satisfact...	07/17/1990
4851590	Method of purifying 2,4-xylenol 2,4-Xylenol can be obtained in high yield and high purity from a crude 2,4-xylenol isomer mixture containing 2,5-xylenol by selectively reacting the 2,5-xylenol with an aldehyde in the presence of an aromatic sulfonic acid, thereby converting the 2,5-xyle...	07/25/1989
4847435	Process for the recovery of high-purity m-ethylphenol A meritorious, commercially successful process for the recovery of a high-purity m-ethylphenol from ethylphenol mixtures containing m- and p-ethylphenols as the major components is disclosed. As it is well known in the art, the ethylphenol mixtures contai...	07/11/1989
4827049	Process for the separation of dihydroxybenzene isomers This invention comprises a process for separating isomers of dihydroxybenzene (DHB) from a feed mixture comprising at least two of said isomers, which process comprises contacting the mixture at adsorption conditions with an adsorbent comprising a Y type ...	05/02/1989
4795829	Process for separating higher molecular weight constituents from phenol polymers A process for separating higher molecular weight constituents from phenol polymers, wherein the phenol polymer is dissolved in an organic solvent medium, the solution obtained is mixed at room temperature with ammonia or an amine such that there is a stoi...	01/03/1989
4769499	Process for separation of substituted benzene isomers A substituted benzene isomer mixture containing a meta-substituted benzene or 1,3,5-substituted benzene is contacted with an adsorbent of a faujasite type zeolite containing a Ag cation and/or a Cu cation, whereby the meta-substituted benzene or 1,3,5-sub...	09/06/1988
4605790	Phenol from coal and biomass Phenol is prepared from mixed phenols derived from coal or biomass by separation of the mixed phenols, isomerization of m- and/or p-cresols to o-cresol, demethylation of o-cresol, dealkylation of xylenols and other alkyl phenols, recycling of products oth...	08/12/1986
4575568	Removal of phenols from water In a process for purification of wastewater streams containing phenolic impurities wherein the wastewater stream is contacted with an ether extraction solvent for the extractive removal of the phenolic impurities, to form an ether extract phase containing...	03/11/1986
4571441	Process for separation of substituted benzene isomers A substituted benzene isomer mixture containing a meta-substituted benzene or 1,3,5-substituted benzene is contacted with an adsorbent of a faujasite type zeolite containing a Ag cation and/or a Cu cation, whereby the meta-substituted benzene or 1,3,5-sub...	02/18/1986
4514574	Process for separating isomeric mixtures Separate isomers via supercritical gas extraction....	04/30/1985
4491677	Isomer separation A process for the separation of isomeric cresols includes the step of crystallizing from a medium containing phenolic and solvent components....	01/01/1985
4487987	Method of decolorizing mixtures of aminoethylpiperazine, a polyoxypropylenediamine and alkylphenols with N,N-diethylhydroxylamine A method of eliminating color-causing impurities in mixtures of aminoethylpiperazine, polyoxypropylenediamines and alkylphenols by treatment with N,N-diethylhydroxylamine is described. These alkylphenols such as nonylphenol are used in epoxy resins in the...	12/11/1984
4447654	Process for separating nitrated phenolic compounds from other phenolic compounds A process is disclosed for separating nitrated phenolic compounds from other nitrated and unnitrated phenolics by treating a mixture of the phenolics with a metal halide salt. The metal halide salt preferentially forms a complex with one of the phenolics ...	05/08/1984
4447658	Process for separating 3,5-xylenol or 3,4-xylenol from other polymethylated phenolic compounds A process is disclosed for separating 3,5-xylenol or 3,4-xylenol from other closely boiling polymethylated phenolics by treating a mixture of the phenolics with a metal halide salt. The metal halide salt preferentially forms a complex with the xylenol ove...	05/08/1984

«First «Previous1 2 3 Next»Last»

PatentStorm

Bizarre Patents

PatentStorm News

Class 568/750 - From mixture of phenols