|
Match
|
Document |
Document Title |
|
|
8002953 |
Low-energy extractive distillation process for dehydration of aqueous ethanol
An energy-efficient extractive distillation process for producing anhydrous ethanol from aqueous/ethanol feeds containing any range of ethanol employs an extractive distillation column (EDC) that...
|
|
|
7879198 |
Processes for the purification of trichlorosilane and silicon tetrachloride
The present disclosure relates to processes and systems for purifying technical grade trichlorosilane and/or technical grade silicon tetrachloride into electronic grade trichlorosilane and/or...
|
|
|
7744727 |
Distillation method
A method for distilling ethanol from a mash includes feeding a fluid to a first distillation column. The fluid and a distillate of the first distillation column are delivered to a second...
|
|
|
7713387 |
Method for separating trioxane from a trioxane/formaldehyde/water mixture by means of pressure change rectification
A process for removing trioxane from a use stream I of formaldehyde, trioxane and water, by a) providing a use stream I of formaldehyde as the main component and trioxane and water as the secondary...
|
|
|
7695595 |
Process for the production of a purified hydrofluoroalkane, purified hydrofluoroalkane, use of the hydrofluoroalkane and method for the analysis of a hydrofluoroalkane
Process for the production of a hydrofluoroalkane, according to which hydrofluoroalkane comprising organic impurities is subjected to at least two distillations.
|
|
|
7481908 |
System and a process for obtaining high purity phenanthrene from phenanthrene enriched coal tar fraction
The present invention relates to a system and a process for obtaining phenanthrene of about 95% purity from coal tar distilled fraction containing crude phenanthrene by performing fractional...
|
|
|
7339088 |
Alkylbenzene refining process and apparatus
Improved processes and apparatus use a finishing column with a mid-cut that provides alkylbenzene products of high purity containing less than about 1 ppmw benzene and less than about 50 ppmw...
|
|
|
7311813 |
Distillation sequence for the purification and recovery of hydrocarbons
This invention is an improved distillation sequence for the separation and purification of ethylene from a cracked gas. A hydrocarbon feed enters a C2 distributor column. The top of the C2...
|
|
|
7241928 |
Process for the manufacture of halocarbons and selected compounds and azeotropes with HF
A liquid phase process is disclosed for producing halogenated alkane adducts of the formula CAR1R2CBR3R4 (where A, B, R1, R2, R3, and R4 are as defined in the specification) which involves...
|
|
|
7238260 |
Purification of N-(2-hydroxyethyl)-2-pyrrolidone
N-(2-hydroxyethyl)-2-pyrrolidone (HEP) is purified by a distillation sequence in which the purified HEP is recovered as a side stream without being separated as an overhead at any point in the...
|
|
|
7128813 |
Process for manufacturing high purity methacrylic acid
A process for the high yield production of high purity glacial methacrylic acid (“HPMAA”) with minimization of decomposition of hydroxy isobutyric acid (HIBA). The HPMAA is substantially pure, spe...
|
|
|
6887352 |
Distillative method for separating hexamethylenediamine from a mixture comprising hexamethylenediamine, 6-aminocapronitrile and tetrahydroazepine
A method for recovering hexamethylene diamine (HMD) from a mixture comprising HMD, 6-aminocapronitrile (ACN) tetrahydroazepine (THA), and adiponitrile (ADN) is disclosed. The method includes...
|
|
|
6863780 |
Process of separating/purifying pentafluoropropane
There is provided an azeotropic mixture having 1,1,1,3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture of...
|
|
|
6849163 |
Method for producing tetrafluoroethylene
There is provided a process for recovering tetrafluoroethylene wherein an amount of energy required to obtain TFE is reduced. In the process for producing a TFE mixture as an intended mixture which...
|
|
|
6838104 |
Process for the production of tocotrienols
This invention relates to processes for the production of tocotrienol compounds from biological sources such as palm oil, cereals, grains, and grain oils. The tocotrienol products are recovered in...
|
|
|
6794470 |
Process for producing a tetrafluoroethylene polymer
A tetrafluoroethylene polymer is produced by polymerizing tetrafluoroethylene in the presence of an aqueous medium and a polymerization initiator, wherein the content of impurities (e.g. a...
|
|
|
6726811 |
Method of purifying N-(2-hydroxyethy)-2-pyrrolidone
A method for obtaining high purity N-(2-hydroxyethyl)-2-pyrrolidone satisfactory for use as an intermediate material for N-vinyl-2-pyrrolidone from a reaction liquid formed of a reaction between...
|
|
|
6706898 |
Methods for separating a tocopherol from a tocopherol-containing mixture
The invention relates to method for separating tocopherol from a first tocopherol admixture by heating the first tocopherol admixture composed of at least one tocopherol, a fatty acid, and an...
|
|
|
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...
|
|
|
6627047 |
Method for preventing polymerization in thin-film type evaporating device
A method is provided for preventing an easily polymerizable substance from being polymerized in a thin-film type evaporating device by supplying a solution of the substance to the evaporating...
|
|
|
6599398 |
Recovery of adiponitrile from a mixture of adiponitrile, aminocapronitrile and hexamethylenediamine
Process for the recovery of a purified adiponitrile (ADN) from a mixture of adiponitrile, aminocapronitrile and hexamethylenediamine, utilizing two sequential distillations: (1) a first...
|
|
|
6508917 |
Method and apparatus for purifying low grade acetonitrile and other constituents from hazardous waste
A method and apparatus for purifying acetonitrile from low grade acetonitriles. Low grade acetonitrile from DNA synthesis, HPLC and pharmaceutical drug manufacturing process wastes which comprise...
|
|
|
6500311 |
Propylene oxide purification
A mixture of propylene oxide and methanol is separated by liquid/liquid extraction using water and a hydrocarbon such as n-octane as extractive solvents.
|
|
|
6488818 |
Removal of impurities from 3-(2′-acetoxyethyl)-dihydro-2(3H)furanone
A process for removing impurities from 3-(2′-acetoxyethyl)dihydro-2(3H)furanone (I), where the 3-(2′-acetoxyethyl)dihydro-2(3H)furanone containing the undesirable impurities is initially pre...
|
|
|
6488817 |
Purification of hydrofluorocarbons
A process for the purification of difluoromethane comprising: (a) subjecting a mixture comprising at least difluoromethane (HFC-32) and dichlorodifluoromethane (CFC-12) to a first distillation step...
|
|
|
6419797 |
Method for producing metal-free Guerbet alcohols
There is provided a process for producing Guerbet alcohols not containing any heavy metals or soaps, wherein primary and/or secondary alcohols having 2 to 30 carbon atoms are condensed at elevated...
|
|
|
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.
|
|
|
6235162 |
Ultrapure hydroxylamine compound solutions and process of making same
In one embodiment, the present invention relates to a method of treating a solution containing hydroxylamine, involving subjecting the solution containing hydroxylamine to fractional distillation...
|
|
|
6224717 |
Methods for separating a tocotrienol from a tocol-containing mixture and compositions thereof
The invention relates to method for separating tocotrienol from a first tocol admixture by heating the first tocol admixture composed of a tocotrienol, at least one tocopherol, a fatty acid, and an...
|
|
|
6201136 |
Separation of liquid mixtures comprising formaldehyde, trioxane, alcohol and hemiformal
In a process for separating liquid mixtures comprising formaldehyde, trioxane, alcohol, hemiformal formed from the formaldehyde and the alcohol, usual minor components and up to 5% by weight of...
|
|
|
6159347 |
Methods for separating a tocol from a tocol-containing mixture
The invention relates to method for separating tocol from a tocol-containing admixture by heating the tocol-containing admixture composed a tocol, a fatty acid, and an esterifying compound to...
|
|
|
6120653 |
Separation and purification method of t-butyl-methylphenol isomer
A method is provided for industrially advantageously and effectively separating 4M2B and 3M6B from a t-butylcresol mixture containing 2-t-butyl-4-methylphenol (4M2B), 2-tbutyl-5-methylphenol...
|
|
|
6106674 |
Operable and efficient distillation schemes for multicomponent separations
The present invention teaches an efficient and easier to operate distillation system to separate mixtures containing three or more components into streams enriched in one of the components. In this...
|
|
|
6048441 |
Isolation of neopentyl glycol hydroxypivalate (NGH)
Neopentyl glycol hydroxypivalate (NGH) is isolated from a mixture containing NGH, lower- and higher-boiling products and inorganic salts and purified in a two-stage process, wherein in a first...
|
|
|
6024840 |
Propylene oxide purification
Propylene oxide obtained by an epoxidation process which uses methanol as a solvent may be effectively treated to remove acetaldehyde by subjecting the crude epoxidation reaction product to...
|
|
|
5985100 |
Process for separating butanol and dibutyl ether by means of dual-pressure distillation
Butanol and dibutyl ether are separated from a mixture containing water, dibutyl ether and n-butanol, 2-butanol and/or isobutanol by a process in which a) the mixture is introduced into a first...
|
|
|
5948213 |
Processes for the manufacture and purification of 1,1,2,2,3,3,4,4-octafluorobutane and by-products, and azeotropes with HF
A process is disclosed for producing 1,1,2,2,3,3,4,4-octafluorobutane. The process involves (a) reacting a mixture comprising 2,2,3,3-tetrafluorobutane and chlorine to form a mixture of...
|
|
|
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 R1a SiClb (OR2)4-a-b (I),where R1 are...
|
|
|
5865958 |
Method for separating cyclohexene
Cyclohexene is separated from a mixture of cyclohexene and at least one of cyclohexane and benzene by subjecting the mixture to extractive distillation in the presence of an extraction solvent the...
|
|
|
5855743 |
Process of isolation of (Meth) acrylic acid
A process is provided for the isolation of (meth)acrylic acid from a mixture containing (meth)acrylic acid as the main component and lower aldehydes as secondary components by rectification in a...
|
|
|
5824397 |
Use of labels for the labelling of rubber parts, in particular tires
Use of labels for labelling rubber parts, in particular tires, comprising a) a base layer comprising a laser-inscribable, co-vulcanizable, pale rubber blend which b) contains an additive which...
|
|
|
5811621 |
Process for recovering ethylene from an olefin stream produced by a methanol to olefin reaction
A polymerizable grade of ethylene is recovered from an olefin-containing composition, prepared by the conversion of a methoxy compound to olefins, by a process which significantly reduces the...
|
|
|
5779863 |
Perfluorocompound separation and purification method and system
Provided is a novel method and system for separating and purifying perfluorocompounds (PFCs). The method comprises the steps of: (a) introducing a perfluorocompound-containing gas stream into a...
|
|
|
5766424 |
Process for removing trioxane from an aqueous mixture
A process for removing trioxane from a liquid mixture containing trioxane, water and formaldehyde, which includes distilling the liquid mixture in a first distillation stage at a low pressure,...
|
|
|
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...
|
|
|
5695615 |
Purification process for cyclic formulas
A purification process for cyclic formals, in which water is efficiently removed from a crude cyclic formal, namely, a mixture of a cyclic formal and water which is difficult to be separated from...
|
|
|
5683553 |
Preparation of 3-chlorophthalic anhydride
A process for preparing essentially pure 3-chlorophthalic anhydride from a mixture in which 3-chlorophthalic anhydride is present in addition to 4,5-dichlorophthalic anhydride, which involves first...
|
|
|
5679223 |
Method for separating and purifying catechol mixtures
An extractive distillation process using a high boiling polyol such as glycerol is employed for separating high purity catechol, 3-methylcatechol and 4-methylcatechol from a high boiling,...
|
|
|
5675054 |
Low cost thermal coupling in ethylene recovery
The invention is a process for reducing capital and energy costs in ethylene recovery. Moderate pressure processing and thermally coupled fractionation steps are achieved through the use of...
|
|
|
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...
|