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Class 203/36 - Alkaline oxide or hydroxide


Subclass of Class 203 - Distillation: processes, separatory
Definition: Processes in which the added material is an alkaline oxide
No. of patents: 62
Last issue date: 08/26/2008


1    
NumberTitleIssue Date
7416645Continuous process for recovering acetone from a waste stream resulting from acetone purification
The present invention provides a continuous process for recovering acetone from a waste stream from an acetone purification stage. The waste stream contains mesityl oxide and optionally acetone. The process for recovering acetone includes separating the waste stream...
08/26/2008
7230126Method for obtaining optically active epoxide
The present invention provides a method capable of suppressing a decrease in optical purity due to the exposure to heat during distillation of an optically active epoxide to permit an optically active epoxide of high quality to be simply obtained on an industrial sc...
06/12/2007
7147757Method for separating an azepine derivative out of a mixture containing an amine an azepine derivative
The invention relates to a method for separating by distillation a portion or the entirety of an azeptine derivative (III), which is selected from the group consisting of aminohexylidene imine, tetrahydroazepine, hexylhexahydroazepine and of aminohexylhexahydroazepi...
12/12/2006
7105078Method for producing an aqueous hydroxylamine solution devoid of salt
A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by distillation a salt-free aqueous hydroxylamine solution, involving using a...
09/12/2006
7074434Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, processes for the preparation of a hydrofluoroalkane and azeotropic compositions
Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, according to which a hydrofluoroalkane/hydrogen fluoride mixture is reacted with at least one chlorinated or chlorofluorinated precursor of the hydrofluoroalkane...
07/11/2006
7002048Method for removal of acetol from phenol
A method is provided for the efficient, low cost removal of acetol from a phenol stream. The method results in removal of substantially all of the acetol from the phenol stream without the formation of substantial amounts of additional methylbenzofuran. The method a...
02/21/2006
6962967Method of purifying polyether polyols of non-volatile impurities
The subject invention provides polyurethane foam and a method of purifying polyether polyols of non-volatile impurities for use in forming the polyurethane foam. The method includes the step of providing a crude polyether polyol having a non-volatile impurity presen...
11/08/2005
6913674Process for fractionating water-containing crude amine mixtures from amine synthesis
A mixture containing one or more amines, water, low-boilers and high-boilers, is fractioned in a process wherein (i) low-boilers are separated from the mixture by distillation, (ii) high-boilers are separated from the mixture by distillatio...
07/05/2005
6668947Drill cutting treatment method
A method and apparatus for treating for disposal oil-contaminated clay substrates such as drill cuttings from drilling with an oil-based mud. If necessary, the substrate is pretreated with an aqueous emulsion breaker such as alkylbenzenesulfonic acid. The...
12/30/2003
6638398Methods for the evaporation of an aqueous solution containing ammonia
A method including evaporating aqueous solutions containing ammonia, adding an acid to the evaporated vapor flow to form an ammonium salt, and condensing the vapor flow to form a liquid containing the salt. By this method the ammonia formed into a salt is...
10/28/2003
6632331Distillation of polycyclic diol
Aldehyde compounds contained in polycyclic diols as impurities are effectively removed by distilling the polycyclic diols in the presence of an alkali metal compound and/or a alkaline earth compound. The distilled polycyclic diols are useful as a diol com...
10/14/2003
6387224Method for distilling mixtures containing butanediol
A process for the separation by distillation of a mixture of 1,4-butanediol and at least one 4-hydroxybutyraldehyde, its cyclic hemiacetal and its cyclic full acetals with at least one further alcohol by carrying out the distillation in the presence of an...
05/14/2002
6093855Separation of the divinyl ether of diethylene glycol or triethylene glycol from the monovinyl ether of the corresponding oliogethylene glycol
The divinyl ethers of diethylene glycol or triethylene glycol are separated from the monovinyl ether of the corresponding oligoethylene glycol by distillation, a metal hydroxide being added to the vinyl ether mixture....
07/25/2000
5591311Process for purifying a 2,6-dialkylphenol
A process for purifying impure 2,6-diisopropylphenol (DIP) mixtures having lower and higher boiling phenolic impurities is described. The process involves washing the mixture with aqueous alkali metal hydroxide solution in an inert atmosphere and separati...
01/07/1997
5522971Dry neutralization of olefinically reactive organic liquid phases
Pure, substantially neutral, low-volatile organic compounds including reactive double bonds are advantageously isolated from a liquid feedstock which contains said compounds in combination with acidic reaction components or auxiliary materials by (i) addi...
06/04/1996
5500098Process for regeneration of volatile acids
Volatile acids containing metal salt impurities, such as metal pickling solutions-are regenerated by a process in which the acid is subjected to sulfuric acid distillation. Resulting volatile acid vapor is condensed and recycled to the pickle tank, while ...
03/19/1996
5489366Recovery of purified and substantially anhydrous propylene oxide
A distillation method for the purification of crude propylene oxide containing contaminating quantities of water and methanol by partially purifying the crude propylene oxide in a plural stage distillation zone to provide a vaporized overhead distillate p...
02/06/1996
5487816Process for the reduction of phenol content in a crude organic stream recovered from a phenol stripper
A process to separate in a fractionation zone an admixture comprising phenol, alpha-methylstyrene and water to produce an alpha-methylstyrene stream containing a minimum of phenol. The pH of the overhead aqueous phase is adjusted with a base to greater th...
01/30/1996
5472679Method of making hydroxyamine and products therefrom
The present invention concerns a method for making energetic oxidizer salts and solutions thereof, and in particular relates to processes for making aqueous solutions of hydroxylammonium nitrate in high purity suitable for use in making liquid gun propell...
12/05/1995
5419815Process for purifying fatty acid amides
The present invention relates to a process for purifying fatty acid amides, which contains the following process steps: neutralization of the fatty acid by addition of an aqueous alkaline solution and subsequent distillation of the neutralized mixture....
05/30/1995
5250155Process for refining soap-containing crude polyol fatty-acid polyester reaction products
A process for refining soap-containing crude polyol fatty-acid polyester reaction product, the process including one or more high-temperature refining treatments and as the first step in the refining process, contacting the crude reaction product with an ...
10/05/1993
5192399Purification of aminonitriles or diamines
Separation of an aliphatic aminonitrile or an aliphatic diamine from a mixture containing the corresponding cyclic, aliphatic, mono-unsaturated amine by adding caustic compound to the mixture and then distilling the aminonitrile or the diamine at a temper...
03/09/1993
5190618Production of high concentration tocopherols and tocotrienols from palm-oil by-products
A process for the production of tocopherols (T) and tocotrienols (T3) from palm fatty acid distillates (PFAD). The process includes converting free fatty acids and glycerides in PFAD into alkyl esters, then separating T and T3 from the alkyl esters and ot...
03/02/1993
5160413Micro-distillation process for cyanide
Micro-distillation apparatus is provided for analyzing acidic anions in which the acidic anion sample is placed in a lower elongated member in water containing an acidifying material, upon heating the acidic anion leaves the lower member as a gas, passing...
11/03/1992
5104491Method for purifying pentachloronitrobenzene by solid base treatment
Crude pentachloronitrobenzene containing hexachlorobenzene and small amounts of acids is treated in the molten state or in a mixture solution of nitrobenzene or chloronitrobenzenes with an inorganic basic substance and then subjected to a distillation und...
04/14/1992
5091058Purified para-cumylphenol
Method of preparing para-cumylphenol including reacting an excess of phenol with alpha-methylstyrene by the slow addition of alpha-methylstyrene to a 50% to 200% molar excess of phenol at a temperature from about 80° C. to about 90° C. in the presence o...
02/25/1992
5047580Process for the separation of sulfuric acid from aqueous mixtures of paraffin-sulfonic acids
The purpose of the process of the present invention is to remove excess sulfuric acid from a mixture of paraffin-sulfonic acids free or substantially free, from paraffins. In order to remove said sulfuric acid, according to the process of the present inve...
09/10/1991
4999090Process for preparing trans-1,4-cyclohexanedimethanol and powder of the same
A process of preparing industrially trans-1,4-cyclohexanedimethanol of high purity by distilling a mixture of cis- and trans-1,4-cyclohexanedimethanol in the presence of alkali, or by heating a mixture of cis- and trans-1,4-cyclohexanedimethanol in the pr...
03/12/1991
4964957Purification of high boiling alkyl sulfides
A process for preventing the substantial decomposition of an alkyl sulfide compound at high temperatures comprising combining a non-reactive basic compound with the alkyl sulfide compound prior to subjecting the resultant mixture to the high temperatures....
10/23/1990
4956157Process for separating salts in seawater
A process for obtaining available elements from seawater is described, which process includes two separation steps. The first separation step involved adjusting the pH of seawater to a low pH by adding a strong acid having sulphate ion, adding a strongly ...
09/11/1990
4915794Process for converting internal olefins to alpha olefins
This invention relates to a process for producing an olefin product having an enhanced alpha olefin content from an olefin feedstock containing internal olefins or a mixture of internal and alpha olefins which includes: (a) contacting the feedstock with a...
04/10/1990
4898644Removal of volatile acids from aqueous solutions
A process for removing volatile acids from aqueous solutions which involves steam stripping a volatile acid from an aqueous solution and contacting the vaporized acid with a reactable cation to form a salt of the acid. A preferred embodiment of apparatus ...
02/06/1990
4891101Purification of tertiary hydroperoxides containing primary and secondary hydroperoxide contaminants
Primary and secondary hydroperoxide contaminants in a tertiary hydroperoxide composition obtained by oxidation of a branched hydrocarbon are removed by contacting the tertiary hydroperoxide with a carboxylic acid derivative such as an anhydride and a basi...
01/02/1990
4808344Process for recovering and purifying unreacted acrylonitrile from the waste stream in the manufacture of 2-acrylamido-2-methyl propane sulfonic acid
Excess amounts of a pure form of acrylonitrile are reacted with other reactants in the production of various compounds such as 2-acrylamido-2-methyl propane sulfonic acid. Accordingly, large amounts of acrylonitrile remain unreacted and present with other...
02/28/1989
4720328Method for removing impurities from caprolactam
A method for removing impurities from caprolactam is disclosed. The method comprises the sequential steps of treating the impure caprolactam with phosphorus pentoxide so that the impurities react therewith to form high boiling species and then distilling ...
01/19/1988
4710300Method for processing of organic materials containing nitrogen compounds
The invention pertains to a method for processing of organic materials containing nitrogen compounds, where the organic material undergoes an anaerobic digestion with simultaneous liberation of biogas which contains methane and carbon dioxide. The liquid ...
12/01/1987
4634796Production of high purity phenol
Phenol feed to a steam distilling column, containing alpha-methylstyrene and mesityl oxide, is treated with a base, without acidification, and the heavy phenol product is acidified and distilled in a high purity column to recover high purity phenol as a s...
01/06/1987
4477354Destruction of polychlorinated biphenyls during solvent distillation
A method is provided for removing polychlorinated biphenyl compounds (PCB) from oil contaminated therewith comprising the steps of extracting said oil with organic solvent, separating the extract, and distilling the solvent from said extract in the presen...
10/16/1984
4434301Production of low color refined isophorone
Crude isophorone is refined by contacting it with aqueous caustic followed by washing and fractional distillation....
02/28/1984
4404063Method for the separation of indole
A method for the separation of indole by distilling an indole-containing reaction fluid obtained by the reaction of aniline with ethylene glycol or by the reaction of N-(ଲ-hydroxyethyl)aniline, which comprises bringing the reaction fluid into contac...
09/13/1983
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