|
Match
|
Document |
Document Title |
|
|
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...
|
|
|
7601245 |
Process for reducing the aldehyde concentration in a mixture comprising cyclohexanone and one or more aldehydes
The invention relates to a process for reducing the aldehyde concentration in a mixture comprising cyclohexanone and one or more aldehydes, said process comprising distilling said mixture in a...
|
|
|
7541427 |
Method for desolvation of polymer solution
An objective of the present invention is to provide a desolvation method for removing a solvent efficiently from a polymer solution. In the present desolvation method where the solvent is removed...
|
|
|
7384518 |
Method for purifying lactams
A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ε-caprolactam obtained by cyclizing hydrolysis...
|
|
|
7309403 |
Method for avoiding corrosion
The invention relates to a method of avoiding corrosion in the separation of methylamine from a product stream ( 10 ) which is obtained in the preparation of methylamines by gas-phase reaction of...
|
|
|
7230126 |
Method 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...
|
|
|
7105078 |
Method 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...
|
|
|
7074434 |
Process 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...
|
|
|
6695928 |
Method for production of (meth) acrylic acid and/or (meth)acrylic esters
A method for the production of (meth)acrylic acid and/or a (meth)acrylic ester is provided. This method for the production of (meth)acrylic acid and/or a (meth)acrylic ester includes washing the...
|
|
|
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...
|
|
|
6632331 |
Distillation 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...
|
|
|
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...
|
|
|
6299737 |
Recovery of glycols from used glycol-containing technical fluids
A process for recovering glycols from used glycol-containing technical fluids, especially from used antifreeze comprises adding to the used glycol-containing technical fluids an organic solvent...
|
|
|
6117277 |
Process for the distillation of alcohols
The invention relates to a process for the purification of C 3 -C 10 -alcohols by distillation, by distilling the alcohols at 150 to 200° C. in the presence of 10 to 1000 ppm of alkali metal...
|
|
|
6093855 |
Separation 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...
|
|
|
5961788 |
Sequential distillation process for removing tetrahydroazepine from aminocapronitrile and/or hexamethylenediamine
A process for removing tetrahydroazepine from aminocapronitrile or hexamethylenediamine by sequential distillation in which the overhead from the second distillation is combined with a fresh,...
|
|
|
5910234 |
Recovery of alcohols from process wastewater from production of silicone resin
This invention relates to a process for working up the alcohol-containing wastewater which is obtained in the hydrolysis of silanes of the general formula I R 1 a SiCl b (OR 2 ) 4 -a-b ...
|
|
|
5902458 |
Method of separating sesamin analogues
A steam stripping substance, which is obtained by steam distillation of sesame oil under reduced pressure and contains sesamin analogues substantially, is mixed with water, a water-soluble solvent...
|
|
|
5788818 |
Process for the purification of acetone
A process for the purification of raw acetone deriving from processes for the production of phenol acetone, impurity mainly due to cumene, water, aldehydes and methanol, the steps of: feeding...
|
|
|
5728272 |
Separation by rectification of unsaturated carboxylic acids from solvents
In a process for the separation by rectification of unsaturated carboxylic acids from solvents in which the acids were absorbed after the synthesis reaction, the rectification is briefly...
|
|
|
5700358 |
Recovery of caprolactam from oligomers and/or polymers of caprolactam
Caprolactam is recovered from oligomers and/or polymers of caprolactam by cleavage of oligomers and/or polymers of caprolactam and subsequent working up by distillation of the caprolactam obtained...
|
|
|
5667644 |
Method for producing a dimerized aldehyde
A method for producing a dimerized aldehyde, which comprises subjecting a feed aldehyde to a condensation reaction and a dehydration reaction in the presence of a basic catalyst, wherein the feed...
|
|
|
5616217 |
Controlled alkali treatment in the recovery of methyl tertiary butyl ether
In the manufacture of MTBE from TBA and methanol, acidic by-products formed during the etherification reaction are removed by fractionating the etherification reaction product in a first MTBE...
|
|
|
5591311 |
Process 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...
|
|
|
5554796 |
Removal of primary and secondary hydroperoxide impurities from tertiary hydroperoxides
A process for the purification of tertiary alkyl hydroperoxide containing contaminating quantities of primary and secondary alkyl hydroperoxides by contacting the impure hydroperoxide mixture with...
|
|
|
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...
|
|
|
5516406 |
Process for purifying acids formed during liquid phase oxidation of butane
A method of purifying the oxidate product formed by the liquid phase oxidation of C 4 -C 8 paraffinic hydrocarbons comprises adding a strong acid catalyst to the oxidate product to catalyze the...
|
|
|
5500098 |
Process 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...
|
|
|
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...
|
|
|
5487816 |
Process 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...
|
|
|
5472679 |
Method 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...
|
|
|
5419815 |
Process 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...
|
|
|
5340445 |
Process for the purification of diaminodiphenyl compounds
Diaminodiphenyl-compounds of the structure selected from: ##STR1## wherein R 1 and R 2 can be: H, --CH 3 , --C 2 H 5 , --C 3 H 7 , --C 4 H 9 or ##STR2## Y can be: C(CH 3 ) 2 , ##STR3## n=0;...
|
|
|
5328707 |
Recovery of waste liquid from production of rice liquor
A process for recovering waste liquid from the distillation of fermented rice liquor. After filtration of the waste liquid, the residue can be recovered as dry feed, and the filtrate which contains...
|
|
|
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...
|
|
|
5250155 |
Process 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...
|
|
|
5236557 |
Process for purification of aqueous solutions containing hydrogen sulfide, hydrogen cyanide, and ammonia
Aqueous solutions which are contaminated by hydrogen sulfide, hydrogen cyanide, and ammonia are brought to a pH of about 3 or less after their formation and treated with an inert gas in a stripping...
|
|
|
5221440 |
Process for destruction of nitro-hydroxy-aromatic compounds in aqueous media
A process for removing organic compounds, including nitro-hydroxy-aromatic compounds and amines, from alkaline wastewater, and in particular from wastewater generated in the production of...
|
|
|
5192399 |
Purification 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...
|
|
|
5160413 |
Micro-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...
|
|
|
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...
|
|
|
5152887 |
Process for reclaiming waste gas treatment chemical
When regenerating gas treating chemicals such as diethanolamine solution, the usual practice is to subject the chemicals to steam stripping. Ultimately such action is ineffective, and it is...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
5064507 |
Distillation process for recovery of high purity phenol
High purity phenol is obtained from cleavage of cumene hydroperoxide by treating the crude phenol product stream in a first treatment zone with an amine, a coarse distillation to obtain an overhead...
|
|
|
5037511 |
Process for the production of pure dimethylether
A process for the production of pure dimethylether by feeding the dehydration product from a dimethylether-synthesis reactor into a distillation column for the production of pure dimethylether at...
|
|
|
5035775 |
Ultrapure hydrazine production
A process for producing hydrazine containing at least 98 percent by weight of N 2 H 4 which admixes an aqueous solution of hydrazine with an alkali metal hydroxide to form a hydrazine solution...
|
|
|
5028735 |
Purification and preparation processes for methyl methacrylate
A purification process for methyl methacrylate (MMA) and a recovery process for methanol are disclosed. A mixture, which contains water, methanol and methyl methacrylate (MMA) as principal...
|
|
|
5011579 |
Neutral oil recovery process for the production of naphthenic acids
A process for treating naphthenic fractions with a caustic blend of sodium and potassium hydroxide, preflashing the naphthenic fraction to remove water and then flashing the dewatered fraction to...
|