Class / Patent application number | Description | Number of patent applications / Date published |
564497000 | Purification or recovery | 18 |
20100274057 | PROCESS FOR ISOLATION OF AN ORGANIC AMINE - The invention relates to a process for the isolation of an organic amine from a composition comprising the organic amine and an acid, or a salt of the organic amine and the acid, wherein the process comprises steps wherein ammonia or hydrazine is added to the composition thereby forming a multi-phase system comprising an organic amine-rich phase and an acid-rich phase, the organic amine-rich phase and the acid-rich phase obtained in step (i) are separated, and the organic amine is isolated from the organic amine-rich phase. | 10-28-2010 |
20110257437 | PROCESS FOR PREPARING PURE TRIETHANOLAMINE (TEOA) - A process for preparing pure triethanolamine (TEOA) by continuously distillatively separating an ethanolamine mixture comprising TEOA and diethanolamine (DEOA), by distilling off DEOA in a distillation column (DEOA column) and supplying the resulting bottom stream comprising TEOA to a downstream column (TEOA column) in which the pure TEOA is withdrawn as a side draw stream, wherein the residence time of the ethanolamine mixture in the bottom of the DEOA column is <20 minutes. | 10-20-2011 |
20120253076 | METHOD FOR PURIFYING COMPOUNDS CONTAINING AMINO GROUPS - Method for purifying compounds (I) containing amino groups from a polar phase A, where
| 10-04-2012 |
20130096350 | Method to Recover Organic Tertiary Amines from Waste Sulfuric Acid - The present invention describes a method to recover organic tertiary amines from waste sulfuric acid comprising the following steps:
| 04-18-2013 |
20140148618 | METHOD FOR REMOVAL AND RECOVERY OF ORGANIC AMINES FROM A HYDROCARBON STREAM - A method for removal and recovery of an organic amine from a hydrocarbon stream containing the amine, including: i) mixing the hydrocarbon stream containing the amine with an aqueous inorganic acid in a volumetric ratio of hydrocarbon stream:aqueous inorganic acid of greater than 1:1-5:1, preferably 1.5:1-4:1, more preferably 3:1, ii) phase separating of hydrocarbon and aqueous phase; iii) removing the hydrocarbon phase and optionally further purifying thereof, iv) optionally recycling at least a part of the hydrocarbon phase obtained in step (iii) into mixing step (i), v) mixing the aqueous phase obtained in step (iii) with an aqueous alkaline solution, vi) phase separating of an aqueous phase and an organic phase formed, vii) removing the organic phase obtained in step (vi) and optionally further purifying thereof. | 05-29-2014 |
20140213824 | METHOD FOR SEPARATING AND PURIFYING 1,4-DIAMINOBUTANE FROM FERMENTED SOLUTION - The present invention relates to a method for separating and purifying 1,4-diaminobutane at high purity and high yield from a fermented solution comprising 1,4-diaminobutane, through cell mass removement, desalination, concentration, impurities removal, and recovery. Also, provided is a method for separating and purifying 1,4-diaminobutane at high purity and high yield from a fermented solution 1,4-diaminobutane, through cell mass removement, desalination, low-temperature concentration, crystallization, filtration, high-temperature concentration and distillation. | 07-31-2014 |
20140296576 | METHOD FOR ISOLATING TERTIARY AMINO ALCOHOL - A method for isolating an amino alcohol simply from an amino alcohol aqueous solution containing a heterocyclic amine compound is provided. The method is a method for isolating a tertiary amino alcohol from a tertiary amino alcohol aqueous solution containing a heterocyclic amine compound, and has generating an imine and/or enamine by adding an aldehyde and/or ketone to the tertiary amino alcohol aqueous solution, isolating the imine and/or enamine from the tertiary amino alcohol aqueous solution, and isolating the tertiary amino alcohol from a residual liquid obtained by isolating the imine and/or enamine. | 10-02-2014 |
20140378708 | METHOD FOR PRODUCING POLYAMINE COMPOSITION FROM PLANT - [Object] An object is to provide a method for producing a polyamine composition with high production efficiency that has a low salt concentration and is derived from plant material. | 12-25-2014 |
20150344405 | Method for Preserving 1,5-Pentanediamine or Salt Thereof, Method for Preventing Discoloration of 1,5-Pentanediamine or Salt Thereof, and 1,5-Pentanediamine or Salt Thereof in Container - Means of preserving 1,5-pentanediamine or a salt thereof without deterioration is provided. 1,5-pentanediamine or a salt thereof is preserved by adjusting any of a water content of 1,5-pentanediamine or a salt thereof purified through a distillation process, a temperature condition, and a material that comes into contact with 1,5-pentanediamine or a salt thereof. | 12-03-2015 |
20150368184 | PURIFICATION OF CADAVERINE - One aspect of the invention relates to a method for reducing salt content in an aqueous cadaverine salt composition comprising adjusting the pH of the aqueous cadaverine salt composition to provide a first composition comprising an aqueous cadaverine composition and a solid composition, and removing the solid composition from the first composition to provide the aqueous cadaverine composition. Another aspect of the invention relates to a method for the purification of cadaverine from an aqueous cadaverine salt composition using the salt-reducing method described herein; and obtaining cadaverine from the aqueous cadaverine composition. | 12-24-2015 |
20150368185 | PURIFICATION OF CADAVERINE USING HIGH BOILING POINT SOLVENT - One aspect of the invention relates to a method for the purification of cadaverine from an aqueous cadaverine composition comprising one or more involatile impurities, the method comprising obtaining cadaverine from evaporation or distillation of the aqueous cadaverine composition wherein one or more solvents are added to the evaporation/distillation system before the evaporation/distillation starts, during the evaporation/distillation and/or after the evaporation/distillation substantially stops when no more evaporation/distillation is observed; wherein the one or more solvents comprise at least one or more high boiling point (HBP) solvents. In certain embodiments, cadaverine may be evaporated/distilled at an unexpectedly lower heating temperature for an unexpectedly shorter heating time to provide a desired yield. Because cadaverine may decompose at high temperature, the unexpectedly lower heating temperature and unexpectedly shorter heating time decrease the undesired cadaverine decomposition. The methods disclosed herein provides unexpected high recovery rate (˜100%) in the evaporation/distillation of cadaverine at a larger scale at a lower heating temperature compared to conventional distillation methods. Thus, the method disclosed herein will be highly appreciated in the industrial production of cadaverine. | 12-24-2015 |
20160168075 | Method for Producing 1,5-Pentanediamine | 06-16-2016 |
564498000 | Of an alkylene polyamine | 5 |
20100069673 | Neutralization of Ethylenediamine Hydrochloride and recovery of Ethylenediamine - In a neutralization and recovery process ethylene diamine hydrochloride (EDA-HCL) is neutralized and ethylene diamine (EDA) is recovered using a mixture of solid caustic dissolved in a non-aqueous solvent, for example an alcohol. | 03-18-2010 |
20100292511 | PURIFICATION OF IMPURE HEXAMETHYLENEDIAMINES - Impure hexamethylenediamines and more particularly those hexamethylenediamines containing contaminating amounts of tetrahydroazepine (THA), or more generally contaminating amounts of imines, are purified by distillation carried out with a short retention time of the impure hexamethylenediamine in the distillation column; the hexamethylenediamine obtained has a very low concentration of THA. | 11-18-2010 |
20130204044 | DECOLORIZATION OF AMINES - The present invention provides methods that are used to decolorize compositions containing one or more amines in the presence of one or more weak acids. Significantly, the weak acids, particularly organic acids such as glacial acetic acid, when used in combination with a heat treatment produce dramatically less by-products than do the stronger mineral acids, making heat treatments and subsequent separation techniques more effective while producing less waste. In some modes of practice, the weak acids do not need to be neutralized, eliminating neutralizing steps and waste streams associated with neutralization. Low color products can be obtained easily at very high yield as a consequence. | 08-08-2013 |
20130274522 | PROCESSES FOR SEPARATING ONE OR MORE AMINE BYPRODUCTS FROM ONE OR MORE DESIRED AMINES - The present invention relates to separating one or more amine byproducts from one or more desired amines. More particularly, the invention involves forming a byproduct component with one or more amine byproducts and a first adjuvant component. The byproduct component has an enhanced separation characteristic relative to separating the amine byproducts from the desired amines in the absence of an adjuvant. Preferably, the byproduct component is separated in the presence of a second adjuvant component that preferably has a boiling point less than the boiling point of the first adjuvant component. | 10-17-2013 |
20180022691 | High Purity Ethylenediamine for Semiconductor Applications | 01-25-2018 |
564499000 | Separating primary, secondary, or tertiary amines from each other | 1 |
20120130132 | METHOD FOR SEPARATING N,N-DIALKYLBISAMINOALKYLETHER FROM MIXTURES COMPRISING N,N-DIALKYLBISAMINOALKYLETHER AND AT LEAST ONE OF N,N,N'-TRIALKYLBISAMINOALKYLETHER AND N,N,N',N'-TETRAALKYLBISAMINOALKYLETHER - According to the present invention, a method for separating a primary amine being an N,N-dialkylbisaminoalkylether, from mixtures comprising said primary amine and at least one of a secondary amine being an N,N,N′-trialkylbisaminoalkylether and a tertiary amine being an N,N,N′,N′-tetraalkylbisaminoalkylether, comprising the steps:
| 05-24-2012 |