Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 6844472 | Method and installation for separating and purifying diphenols in the phenol and phenol derivatives industry A method and installation for separating and purifying a crude mixture containing hydroquinone, resorcinol and possibly tars and/or catechol, comprising the following steps: —a possible distillation stage (I) in order to obtain a catechol head, —the foot (I) or ... | 01/18/2005 |
| 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 |
| 5964987 | Neutral oil removal from natural cresylic acid mixtures Natural cresylic acid is processed to remove neutral oil impurities by countercurrent liquid/liquid extraction using a heavy phase solvent of a mixture of glycerol and another polyhydric alcohol, preferably triethylene glycol. The light phase solvent is a... | 10/12/1999 |
| 5354429 | Natural cresylic acid processing A discrete impure cresylic acid distillate fraction derived by fractional distillation of a natural cresylic acid feedstock from which tar bases and/or neutral oils have not been removed is subjected to extractive distillation with a polyhydric alcohol ex... | 10/11/1994 |
| 5300704 | Controlled catalytic and thermal sequential pyrolysis and hydrolysis of mixed polymer waste streams to sequentially recover monomers or other high value products A process of using fast pyrolysis in a carrier gas to convert a plastic waste feedstream having a mixed polymeric composition in a manner such that pyrolysis of a given polymer to its high value monomeric constituent occurs prior to pyrolysis of other pla... | 04/05/1994 |
| 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 |
| 5146010 | Pyrolysis of naturally occurring cresylic acid mixtures A process for removing guaiacols from naturally-occurring cresylic acid mixtures by pyrolysis is described.... | 09/08/1992 |
| 5136111 | Controlled catalytic and thermal sequential pyrolysis and hydrolysis of phenolic resin containing waste streams to sequentially recover monomers and chemicals A process of using fast pyrolysis in a carrier gas to convert a waste phenolic resin containing feedstreams in a manner such that pyrolysis of said resins and a given high value monomeric constituent occurs prior to pyrolyses of the resins in other monome... | 08/04/1992 |
| 5094722 | Process for the purification of a dimethylphenol isomer A purified desired isomer which is either 3,4- or 3,5-dimethylphenol is separated with a high yield from a dimethylphenol-containing fraction which contains both 3,4- and 3,5-dimethylphenols. The fraction is distilled so as to give a distillate which is e... | 03/10/1992 |
| 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 |
| 4547596 | Separation and recovery of alkylated phenols A method is provided for separating alkylated phenols based on differences in their dissociation constants without the consumption of neutralizing acid or base. This is accomplished by selectively reacting the mixed alkylated phenol having the having diss... | 10/15/1985 |
| 4538007 | Process for the simultaneous recovery of 4-hydroxy-diphenyl and 4,4'-dihydroxydiphenyl 4-Hydroxydiphenyl (mono-OD) and 4,4'-dihydroxydiphenyl (DOD) are obtained simultaneously from a mixture which contains these two substances, if such a mixture is treated with an aqueous alkali, and the resulting solution and the solid phase formed are sep... | 08/27/1985 |
| 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 |
| 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 |
| 4433181 | Process for recovering a crystallization medium A process is provided for recovering the crystallization medium used for separating a 2,6-disubstituted phenol (DSP) from a feedstock containing it and a phenol in which only one of the 2 or 6 carbon positions are substituted (MSP). More particularly, the... | 02/21/1984 |
| 4431846 | Reduction of o-ethylphenol in m,p-cresol by preferential t-butylation A process is disclosed for reducing the concentration of o-ethylphenol in m,p-cresol by partially t-butylating a mixture of the above and equilibrating the resultant mixture to convert o-ethylphenol and its 6-t-butyl derivative to the thermodynamically mo... | 02/14/1984 |
| 4429169 | Process for separating isopropylated m-cresols A process is disclosed for separating 5-isopropyl-m-cresol from other isopropylated m-cresols by treating a mixture of the isopropylated m-cresols with a metal halide salt. The metal halide salt preferentially forms a complex with 5-isopropyl-m-cresol ove... | 01/31/1984 |
| 4423253 | Process for separating t-butylated phenols A process is disclosed for separating t-butylated phenolic compounds from other t-butylated and unbutylated 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 phe... | 12/27/1983 |
| 4394526 | Para-cresol halide salt complex useful for separating para-cresol from meta-cresol Para-cresol is separated from a mixture comprising meta-cresol and various other methylated and ethylated phenols by preferentially complexing the para-cresol with one or more anhydrous or dehydrated inorganic salts selected from the group consisting of c... | 07/19/1983 |
| 4386225 | Process for the separation of cresol from xylenol A process for the separation of at least one cresol isomer from a feed mixture containing the cresol and xylenol which process employs a crystalline aluminosilicate adsorbent to selectively adsorb the cresol from the feed mixture. The process employs a de... | 05/31/1983 |
| 4374283 | Purification of aqueous effluent streams containing BPA and phenol A method for a purifying aqueous effluent streams containing BPA and phenol using liquid-liquid extraction with methyl isobutyl ketone.... | 02/15/1983 |
| 4371721 | Selective cracking of disubstituted benzenes having polar substituents A process for selective cracking of 1,4-disubstituted benzene compounds having at least one polar substituent. Mixtures containing isomers of such a compound are brought into contact with a specified type of shape selective crystalline zeolite catalyst un... | 02/01/1983 |
| 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 |
| 4275246 | Separation of phenols Effluent containing cresols such as are contained in Lurgi tar acids are separated by preferentially treating the cresols with an aqueous alkali metal carbonate or bicarbonate at elevated temperature for a time sufficient to form the alkali metal salt of ... | 06/23/1981 |
| 4267391 | Process for obtaining para-cresol and meta-cresol from a mixture of methylated and ethylated phenols characterized by urea clathration of metal-cresol A process is disclosed for the stepwise separation of para-cresol and meta-cresol from a mixture of methylated and ethylated phenols. The para-cresol preferentially forms a complex with a dehydrated or anhydrous inorganic salt selected from the group cons... | 05/12/1981 |
| 4267390 | Process for obtaining para-cresol and meta-cresol from a mixture of methylated and ethylated phenols characterized by selective complexation with calcium bromide and sodium acetate A process is disclosed for the stepwise separation of para-cresol and meta-cresol from a mixture of methylated and ethylated phenols. The para-cresol forms a complex with a dehydrated or anhydrous inorganic halide salt selected from the group consisting o... | 05/12/1981 |
| 4267392 | Process for obtaining para-cresol and meta-cresol from a mixture of methylated and ethylated phenols containing meta-para-cresol Para-cresol and meta-cresol are separated from a mixture of methylated and ethylated phenols by a two-stage process wherein the para-cresol is preferentially complexed with one or more anhydrous or dehydrated inorganic salts selected from calcium bromide,... | 05/12/1981 |
| 4228311 | Selective dealkylation of 4-tertiary-alkyl-2,5-xylenol A method is described for the selective dealkylation of 4-tertiary-alkyl-2,5-xylenol while it is admixed with 6-tertiary-alkyl-2,4-xylenol by contacting the mixture of alkylated xylenols with a polymer-bound sulfonic acid catalyst at temperatures of ... | 10/14/1980 |
| 4218576 | Process of scrubbing polyvalent phenols from gas Mono and polyvalent phenols are recovered from gasified coal by scrubbing the phenol-containing gas with water, separating the extracted phenols into a monovalent phenol-rich fraction and a polyvalent phenol-rich fraction and recovering the monovalent phe... | 08/19/1980 |
| 4153630 | Inclusion compounds, process for preparation thereof, and process for separating isomers using the inclusion compounds An inclusion compound comprising meta-cyclophane of the formula ##STR1## and at least one benzene derivative included therein. And a process for separating an isomer containing a substituent at least at the 1- and 4-positions from a mixture containin... | 05/08/1979 |
| 4147735 | Separation of organic compounds from mixtures by clathration A method for the separation of organic compounds by clathration in which there is used as a host a compound of formula I: ##STR1## wherein: Ar1 Ar2 and Ar3 and Ar4, which may be identical or different, repr... | 04/03/1979 |
| 4145283 | Process for the purification of waste water The waste water being formed upon the preparation of hydroxy aromatics, preferably of resorcinol and ଲ-naphthol, by caustic alkaline melt of the corresponding aryl-sulfonic acids or aryl sulfonates is purified by wet oxidation with oxygen or oxygen-... | 03/20/1979 |
| 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 |
| 4097539 | Process of scrubbing polyhydroxy phenols from gas Mono and polyvalent phenols are recovered from gasified coal by scrubbing the phenol-containing gas with water, separating the extracted phenols into a monovalent phenol rich fraction and a polyvalent phenol rich fraction and recovering the monovalent phe... | 06/27/1978 |
| 3969420 | Process for recovering resorcinol and hydroquinone in mixture Resorcinol and hydroquinone are recovered in mixture at a high purity from a solution containing resorcinol and hydroquinone, especially, a solution resulting from cleavage of oxidation products of isopropylbenzene and successive distillation of the cleav... | 07/13/1976 |
