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7615137 |
Process for recovering caprolactam from aqueous caprolactam product using in situ prepared alkali amino caproate
A continuous process is provided for recovering caprolactam from aqueous caprolactam product which includes (i) caprolactam, (ii) impurities, and (iii) water by (a) adding alkali hydroxide to the...
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7550064 |
Method for continuously operated pure distillation of oxiranes, especially propylene oxide
The invention relates to a continuously operated process for the purification by distillation of the oxirane formed in the oxirane synthesis by reaction of a hydroperoxide with an organic compound,...
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7527712 |
Method for the continuous purification by distillation of the solvent methanol, used in the synthesis of propylene oxide
Process for the continuously operated purification by distillation of the methanol used as solvent in the synthesis of propylene oxide by reaction of a hydroperoxide with propylene, with the...
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7494584 |
Energy efficient method for exothermic reactions
An energy efficient process scheme for a highly exothermic reaction-distillation system in which the reactor is external to the distillation column and the feed to the reactor is a mixture of at...
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7476299 |
Vessel for easily polymerizable compound
A decomposition reaction apparatus or distillation apparatus for acrylic acid in which a column bottom liquid heated in a reboiler ( 5 ) is supplied from a supply port ( 1 a ) provided on a side...
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7476297 |
Device and method for carrying out heterogeneously-catalysed reactive distillations in particular for the production of pseudoionone
A column is described for carrying out reactive distillations in the presence of a heterogeneous particulate catalyst having an ordered packing or random packings which form intermediate spaces in...
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7445702 |
Desulphurisation
Propane and/or butanes are separated from a hydrocarbon feedstock contaminated with alkyl mercaptans by fractional distillation at such a pressure that the separated overheads stream containing...
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7416645 |
Continuous 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....
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7410555 |
Process and apparatus for catalytic distillations
A process for reacting a first component with itself or a second component to produce a third component in which a first material comprising a first component or said first component and a second...
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7384519 |
Process for the purification of pharmaceutical grade HFC-134a and polymer grade HCFC-22
A method for the purification of pharmaceutical grade 1,1,1,2-tetrafluoroethane (HFC-134 a ) and polymer grade chlorodifluoromethane (HCFC-22) by contacting a mixture containing...
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7320745 |
Energy efficient method for exothermic reactions
An energy efficient process scheme for a highly exothermic reaction-distillation system in which the reactor is external to the distillation column and the feed to the reactor is a mixture of at...
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7282119 |
Process and apparatus for the isolation of pure, or substantially pure, organometallic compounds
A process and apparatus to enable the continuous isolation of an organometallic compound, such as trimethylindium from a liquid feedstock. The liquid feedstock is delivered to a distillation column...
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7273957 |
Process for the production of gasoline stocks
A process for the production of gasoline stocks wherein lower molecular weight olefins are first oligomerized and the oligomers then hydrogenated. In the first instance the oligomerization is...
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7258766 |
Method for collecting acrylic acid
A method for collecting acrylic acid is provided, which includes the step of collecting acrylic acid using an aqueous medium from a reaction gas containing acrylic acid obtained by catalytic...
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7255777 |
Distillation system
Improved HETP is obtained in the operation of a distillation column containing trays with a packing of a porous container containing a particulate material intimately associated with a resilient...
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7118653 |
Process for the purification of mixtures of toluenediisocyanate incorporating a dividing-wall distillation column
Process for the purification of toluenediisocyanate from a crude distillation feed which includes toluenediisocyanate, an organic solvent and less than 2% by weight phosgene by separating the crude...
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7108770 |
Process for the purification of toluene diisocyanate incorporating a dividing-wall distillation column for the final purification
Toluene diisocyanate is recovered from a crude distillation feed containing less than 2% by weight of phosgene by (a) fractionating the crude distillation feed containing less than 2% by weight of...
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7087803 |
Method for the recovery of perfluorinated sulphonic acid
Method for the recovery of a perfluorinated sulphonic acid from a viscous organic residue by aqueous extraction of the acid from the residue in presence of a solvent containing aromatic compounds.
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7060165 |
Processes for purification and production of fluorocarbons
The present invention involves processes that utilize an olefinic compound, in particular, hexafluoropropene (HFP) or chlorotrifluoroethene (CFC-1113) as extracting agents in the purification of...
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7052656 |
Column for carrying out an isotope exchange between a liquid substance and a gaseous substance
The column is provided for carrying out an isotope exchange (EM) between a liquid substance (L) and a gaseous substance (G) using a catalytic reaction (EK). In this reaction the isotope exchange...
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7041199 |
Process and device for hydrolytically obtaining a carboxylic acid alcohol from the corresponding carboxylate
A process and a device for the catalytic hydrolysis of a carboxylate, e.g., methyl acetate, ethyl acetate, i- or n-propyl acetate, i- or n-butyl acetate, allyl acetate and methyl formate, into the...
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6998026 |
Method for producing tertiary C4-C8-alkyl esters of (meth)acrylic acid
A tert-C 4 –C 8 -alkyl (meth)acrylate is prepared by reacting (meth)acrylic acid with an olefin of the formula
where
R 1 and R 2 , which may be identical or different, are methyl or...
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6984293 |
Azeotropic distillation of cyclic esters of hydroxy organic acids
Cyclic esters of hydroxy organic acids can be produced and recovered via azeotropic distillation. In certain embodiments cyclic esters, such as glycolide and lactide, can be produced from a...
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6905576 |
Method and system for producing silane
This invention relates to a continuous process for the preparation of silane by catalytic disproportionation of trichlorosilane in a reactive/distillative reaction zone having a catalyst bed of...
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6846473 |
Process for producing hexachlorodisilane
A process for producing hexachlorodisilane comprising, condensing an exhaust gas discharged from a reactor for producing polycrystalline silicon from a chlorosilane and hydrogen to separate the...
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6790319 |
Method for recovering titanium compound, process for preparing titanium halide, and process for preparing catalyst for polymer production
A method for recovering a titanium compound includes bringing a waste solution containing a titanium alkoxide into contact with a halogenating agent to convert at least a part of the titanium...
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6712942 |
Working up a mixture comprising alkene and oxygen
A mixture (M1) comprising an alkene and oxygen is worked up by a process in which (i) oxygen is removed from the mixture (M1) by a nondistillative method to give a mixture (M2) and (ii) the alkene...
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6706153 |
Process for the separation of a ketoxime or aldoxime from an amide
The invention relates to a process for the separation of a ketoxime or aldoxime from a ketoxime- or aldoxime-containing amide mixture in which the ketoxime or aldoxime is separated from the amide...
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6632330 |
Process for purification of alkyl alkanoate
A process for the recovery of substantially pure alkyl alkanoate, such as ethyl acetate, from an impure feedstock. The impure feedstock is contacted with a selective hydrogenation catalyst in the...
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6627046 |
Separation of the products of polyamide ammonolysis
The useful reaction products in an output stream from an ammonolysis reactor are separated in a manner which minimizes the time during which high boiling polyamide intermediate material(s) are in...
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6605191 |
Method for reprocessing reaction mixtures containing diaryl carbonate
A process for the work up of a reaction mixture obtained from the preparation of diaryl carbonate by direct carbonylation of aromatic hydroxy compounds is disclosed. The process entails obtaining a...
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6586605 |
Purification of alkylene carbonate
The invention is a method to purify an alkylene carbonate such as propylene carbonate by contact with at least two solid adsorbents comprising carbon and an inorganic silicon or aluminum oxide. The...
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6500309 |
Dimensions in reactive distillation technology
A system for separating products from reactants within a reactive distillation column is revealed. Reaction products heavier than reactants are discouraged to re-enter the reaction zone by a...
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6472568 |
Reaction and distillation device and etherification process
The invention relates to a process for preparing at least one aliphatic monoalcohol, generally in excess, and at least one olefin. The process is performed in a distillation and reaction device...
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6468399 |
Process for isolating cyclopentane and/or cyclopentene
Cyclopentane and/or cyclopentene and, if desired, isopentane can be obtained by distillative separation from a pre-benzene fraction or a C 5 fraction which has in each case being partially...
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6464838 |
Process for the recovery of compounds present in the heavy products after their preparation
A process for the recovery of compounds present in a mixture containing residues of heavy products is provided. The process includes conducting a reaction and distillation to obtain the compounds...
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6458969 |
Process for the purification of alkylene carbonate
This invention concerns a process to provide high purity alkylene carbonate though use of multiple distillations wherein the unused fractions are recycled to the reactor. The high purity alkylene...
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6423189 |
Process for the preparation of 1,3-dichloropropane
A process for the preparation of 1,3-dichloropropane by reacting bis( 3 -hydroxypropyl)ether with hydrogen chloride, optionally in the presence of tertiary basic nitrogen compounds or other...
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6416659 |
Process for the production of an ultra low sulfur
A process for the hydrodesulfurization of a diesel boiling range petroleum fraction wherein the hydrodesulfurization is carried out concurrently with a fractional distillation in a distillation...
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6387223 |
Alkylene carbonate process
This invention concerns a process to provide high purity akylene carbonate though use of multiple distillations wherein the unused fractions are recycled to the reactor.
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6379507 |
Process for producing methylal
A process for producing methylal that involves feeding a liquid containing methanol, formaldehyde and water to an uppermost reactor of at least four solid acid catalyst-filled reactors which are...
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6358373 |
Production of polyamides by reactive distillation
The preparation of polyamides, their oligomers or mixtures thereof, where appropriate with other reaction products, takes place by reacting amino nitrites (A) and, where appropriate, other...
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6352619 |
Method for purifying acrylic acid
Process for purifying acrylic acid in order to remove the polymer-type impurities in those places in the distillation columns in which they have a tendency to accumulate, and more particularly a...
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6297415 |
Catalytic distillation process
A catalyst packing which can be produced by vapor deposition and/or sputtering of at least one substance active as catalyst and/or promotor onto woven or knitted fabrics or sheets as support...
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6251227 |
Catalytic and adsorptive-processes using containers for solid granular materials
In the field of bringing fluids into contact with solid materials, the invention relates to the use of a container which is suitable for granular materials. The container, of a material which is...
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6242661 |
Process for the separation of isobutene from normal butenes
A process for the separation of isobutene, otherwise inseparable from butene-1 by fractionation, in high purity from butenes contained in a mixed hydrocarbon stream containing butene-1, butene-2...
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6214172 |
Preparation of methylglyoxal dimethyl acetal
In a process for the preparation of methylglyoxal dimethyl acetal from methylglyoxal and methanol in the presence of an acidic ion exchanger, water is introduced in an amount sufficient to form an...
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6159344 |
Reaction and distillation device
The invention relates to a distillation and reaction device having a reaction section and a distillation-reaction section. The distillation-reaction section has a distillation zone with at least...
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6137023 |
Process for the production of high purity isobutene combining reactive distillation with hydroisomerisation and skeletal isomerisation
The invention relates to a process for producing high purity isobutene from a hydrocarbon cut essentially comprising olefinic hydrocarbons containing 4 carbon atoms per molecule including...
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6110326 |
Method for concurrent reaction and distillation of fluid streams
A method for operating a column having a region for reaction with distillation of fluid streams is provided with structures including catalyst-filled containers having liquid permeable upper...
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