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| Number | Title | Issue Date |
| 7311807 | Process for the separation of mixtures containing m-and p-dichlorobenzene A process for the separation of dichlorobenzene mixtures containing m- and p-dichlorobenzene in which: (i) the mixture is as an extracting agent contacted with a phosphoric ester of the general formula (I) as an extracting agent | 12/25/2007 |
| 7250527 | Process for recovering acrylonitrile or methacrylonitrile A process for the recovery of acrylonitrile or methacrylonitrile from an aqueous solution comprising subjecting the said solution to a water extractive distillation by feeding the solution to a distillation column and performing said extractive distillation and usin... | 07/31/2007 |
| 7164044 | Process for producing high purity trialkanolamine A process for producing a high purity trialkanolamine excelling in hue and having an APHA of not more than 40, characterizing by including producing a mixed alkanolamine by the reaction of an alkylene oxide with ammonia; removing low-boiling substances from the mixe... | 01/16/2007 |
| 6962967 | Method 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 |
| 6685802 | Process and apparatus for removing dissolved and undissolved solids from liquids This invention relates to a continuous process and an apparatus (1) for removing dissolved and undissolved solids and/or high boiling point liquid contaminants from a mixture of miscible liquids (9). A recycle liquor stream (6) is fed at high velocity thr... | 02/03/2004 |
| 6387224 | Method 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 |
| 5653853 | Method of removing iodine compounds from crude acetic anhydride A process by which iodine compounds contained in crude acetic anhydride or a mixture of crude acetic anhydride and crude acetic acid can be converted into methyl iodide having a low boiling point and which can be separated by distillation and efficiently ... | 08/05/1997 |
| 5595634 | Process for selective hydrogenation of highly unsaturated compounds and isomerization of olefins in hydrocarbon streams A process for treating C3 to C12 petroleum fractions, such as a light cracked naphtha to be used as an etherification feed stock in which H2 S is removed by distillation of at least the C3 fraction and mercaptan... | 01/21/1997 |
| 5522971 | Dry 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 |
| 5489366 | Recovery 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 |
| 5395486 | Dehydration process Dehydrated compositions are obtained by: combining a hydrous composition, e.g., a hydrous electrolyte salt, with inert fluorochemical liquid; heating the resulting mixture in a vessel to volatilize water and inert fluorochemical liquid therein until the w... | 03/07/1995 |
| 5344528 | Recovery of phenol from low concentrations with sodium sulfate Phenol plant waste water containing small amounts of phenol and sodium sulfate is successfully distilled through the addition of recovered sodium sulfate to enhance the volatility of the phenol relative to water; at least a portion of the sodium sulfate i... | 09/06/1994 |
| 5340445 | Process for the purification of diaminodiphenyl compounds Diaminodiphenyl-compounds of the structure selected from: ##STR1## wherein R1 and R2 can be: H, --CH3, --C2 H5, --C3 H7, --C4 H9 or ##STR2## Y can... | 08/23/1994 |
| 5306398 | Process for the purification of waste acetic acid Waste acetic acid, which is contaminated by nitrogen compounds and also by hardly hydrolyzable halogen compounds, is purified by adding a complex-forming metal or one of the compounds thereof and a basic compound. The resultant mixture is kept at a temper... | 04/26/1994 |
| 5158651 | Process of centrifugally removing inorganic compounds from polyester glycol recovery bottoms A process for removing inorganic compounds from glycol recovery still bottoms resulting from the manufacture of poly(ethylene terephthalate), the novel process using a small amount of phosphoric acid to precipitate the antimony and then removing the titan... | 10/27/1992 |
| 5124004 | Distillation process for ethanol A method of distillation employing a heat pump (which may be driven by a compressor) using a vapor stream from within the distillation system as a heat source and a liquid stream from within the distillation system as a heat sink. The selection of heat-so... | 06/23/1992 |
| 5104491 | Method 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 |
| 5094720 | Process for the distillative purification of citral A method is disclosed for enhancing the purification of citral by fractional distillation by inhibiting the formation of isocitrals from isomerization of citral during the distillation process. The method involves reducing the pH of a mixture containing c... | 03/10/1992 |
| 5091057 | Stripping process for water removal from alcohol A process for obtaining a substantially dry alcohol from a mixture comprising alcohol and water in a non-azeotropic amount by utilizing at least a portion of the alcohol in the mixture as the stripping medium.... | 02/25/1992 |
| 5091058 | Purified 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 |
| 5047580 | Process 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 |
| 4994150 | Process for the purification of esters of mercapto acids The present invention provides a process to recover esters of mercapto acids from solutions containing water by mixing an extraction mixture comprising cycloalkane, arene, and an aqueous inorganic salt solution with an ester of mercapto acid and water sol... | 02/19/1991 |
| 4964957 | Purification 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 |
| 4963232 | Process for producing a purified hydrazine hydrate Provided by this invention is a process for producing a purified hydrazine hydrate having a low total organic carbon concentration and which involves: a first step which includes distilling an aqueous solution of hydrazine hydrate in the presence of at le... | 10/16/1990 |
| 4961826 | Distillation process for ethanol A method of distillation employing a heat pump (which may be driven by a compressor) using a vapor stream from within the distillation system as a heat source and a liquid stream from within the distillation system as a heat sink. The selection of heat-so... | 10/09/1990 |
| 4915794 | Process 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 |
| 4898644 | Removal 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 |
| 4765869 | Process for the production of a dialkyl maleate A continuous process is described for the production of a substantially acid free dialkyl maleate, for example diethyl maleate, from a feed stream containing a major amount of dialkyl maleate and a minor amount of the corresponding monoalkyl maleate. This... | 08/23/1988 |
| 4755262 | Method for purification of glycidyl acrylate or glycidyl methacrylate This invention relates to a method for the purification of glycidyl acrylate or glycidyl methacrylate. Specifically, the invention effects the purification by using a residual catalyst-inactivating additive and consequently produces highly purified glycid... | 07/05/1988 |
| 4716244 | Process for the preparation of sterically hindered hydroxyphenylcarboxylic acid esters If the transesterification of esters of formula II ##STR1## with alcohols of formula III A--OH)m is catalysed by treatment with catalytic amounts of an organic or inorganic zinc salt and the resultant melt is subsequently distilled in a sh... | 12/29/1987 |
| 4548701 | Method for extraction solvent recovery A method for recovery of extraction solvent from a dissolved solute wherein halogen gas evolution and halogen compound retention in the solute are minimized comprises heating a solution of a halogenated organic solvent and the extracted solute in the pres... | 10/22/1985 |
| 4433194 | Purification of cyclohexane Solvents which may be used as mediums for the polymerization of olefinic hydrocarbons to form polymers useful as membranes in a gas separation process require purification to remove any impurities which will effect the aforesaid polymerization. Purificati... | 02/21/1984 |
| 4404063 | Method 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 |
| 4401516 | Process for separating acetamidoethylene from crude preparation products Acetamidoethylene is isolated from acetamidoethylene-containing mixtures by distillation with enhanced efficiency when a high-boiling liquid, especially glycerol, is added to the mixtures prior to or during said distillation. This invention is particularl... | 08/30/1983 |
| 4400241 | Extractive distillation process for the production of fuel grade alcohols A novel composition, and extraction process for the dehydration of a hydrated aliphatic, monohydric alcohol to produce a fuel grade alcohol. A select group of alkali-metal and alkaline-earth metal salts are added to and dissolved within a low volatility p... | 08/23/1983 |
| 4384924 | Method of separating acids and bases which have been carried along in the vapors formed during distillation A method of separating acids or bases from vapors which are conveyed along with distillation vapors during concentration of a solution, comprising, passing said distillation vapors containing an acid or base, while being maintained at their existing press... | 05/24/1983 |
| 4381222 | Process for the distillative separation of tertiary alkyl hydroperoxides and ditertiary alkyl peroxides A process for the distillative separation of tertiary alkyl hydroperoxides of the formula wherein R is a tertiary alkyl group with 4 to 6 carbon atoms from the corresponding di-tertiary alkyl peroxides resulting during their preparation, which process com... | 04/26/1983 |
| 4360407 | Process for removing glycerine The distillative separation of a mixture of glycerine and glycerine-based acetal or ketal transesterification products is aided by addition of a borate ester-forming compound to the mixture prior to distillation.... | 11/23/1982 |
| 4358360 | Dewaxing process Halogenated hydrocarbon and uncontaminated water is recovered from a stream of process water contaminated with halogenated hydrocarbon and hydrogen halide. The process water is neutralized and then distilled to obtain a first fraction containing halogenat... | 11/09/1982 |
| 4349417 | Process for the manufacture of extremely pure monoethylene glycol Ethylene oxide and water are reacted in a reactor and the reaction product is subjected to distillation in a plurality of distillation columns, in the first columns water and components having a boiling point below that of monoethylene glycol and higher e... | 09/14/1982 |
