Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7977514 | 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 compos... | 07/12/2011 |
| 7560594 | Method for producing triethanolamine Method of producing triethanolamine where a phosphane or a compound which liberates a phosphane is added to the triethanolamine. ... | 07/14/2009 |
| 7550632 | Methods of treating triethanolamine with acid components and basic components, and triethanolamine compositions containing the same Methods for improving color properties of triethanolamine, and triethanolamine compositions treated thereby, are disclosed, wherein the methods comprise: (a) providing a composition comprising triethanolamine; and (b) contacting the composition with an acid componen... | 06/23/2009 |
| 7425652 | Preparation of alkanolamines Alkanolamine compositions are disclosed. The composition comprises an alkanolamine and hydroxylamine or hydrazine. Preferred alkanolamine includes diethanolamine, triethanolamine, and mixtures thereof. The composition of the invention has significantly reduced disco... | 09/16/2008 |
| 7329354 | Purification of organic solvent fluids A chemical distribution system having improved organic solvent fluid purity and consistency includes a vessel containing ion-exchange media positioned within a fluid flow pathway such that the organic solvent fluid passes through the ion-exchange media, thereby effe... | 02/12/2008 |
| 7323600 | Process for improving the conversion of oxazolidones to alkanolamines There is provided a regeneration process for converting oxazolidones such as hydroxypropyloxazolidone (HPOZD) to alkanolamines such as di-isopropanolamine (DIPA) and CO2. An amine stream containing HPOZD joins a stream that includes a caustic solution. Th... | 01/29/2008 |
| 7271292 | Process for distillatively removing piperazine from an ethylenediamine-piperazine mixture The invention relates to a process for continuously, distillatively removing piperazine from an ethylenediamine-piperazine mixture under pressure at elevated temperature, by discharging the ethylenediamine at the top and the piperazine at the bottom of a distillatio... | 09/18/2007 |
| 7208632 | Separation of 6-aminocapronitrile and hexamethylenediamine from a mixture comprising hexamethylenediamine, 6-aminocapronitrile and tetrahydroazepine The invention relates to the field of separation by distillation of 6-aminocapronitrile (ACN) and hexamethylenediamine (HMD) from a mixture comprising ACN, HMD, tetrahydroazepine (THA), adiponitrile (ADN) and low boilers (LB). Also disclosed is a method for producin... | 04/24/2007 |
| 7169268 | Color stabilization of amines The present invention concerns a process for providing tertiary amine products which are color-stable, and have a greatly reduced tendency to take on color during their storage. According to the invention, an ethyleneamine derivative is added to the distillation pot... | 01/30/2007 |
| 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 |
| 7147757 | Method for separating an azepine derivative out of a mixture containing an amine an azepine derivative The invention relates to a method for separating by distillation a portion or the entirety of an azeptine derivative (III), which is selected from the group consisting of aminohexylidene imine, tetrahydroazepine, hexylhexahydroazepine and of aminohexylhexahydroazepi... | 12/12/2006 |
| 7029557 | Method for producing an aqueous hydroxylamine solution devoid of salt The invention relates to a method for producing a highly pure, aqueous hydroxylamine solution by distilling an aqueous solution, devoid of salt, of a hydroxyl ammonium salt in a plate column comprising at least two mechanical plates. Said method is characterised in ... | 04/18/2006 |
| 6986833 | Process for fractionating water-containing crude amine mixtures from amine synthesis An amine-containing mixture containing one or more amines, water, low-boilers and optionally high-boilers is fractionated by a process having the steps (iii) and (iv) and optionally the steps (i), (ii) and (v): (i) a (first) low-boiler fraction is separ... | 01/17/2006 |
| 6951960 | Method for removing impurities from solvent extraction solutions A method for regenerating an amine extractant used for recovery of metals involves contacting a liquid organic phase containing an amine complexed with one or more metals with an aqueous solution substantially free of chloride ions to strip the one or more metals fr... | 10/04/2005 |
| 6913674 | Process for fractionating water-containing crude amine mixtures from amine synthesis A mixture containing one or more amines, water, low-boilers and high-boilers, is fractioned in a process wherein (i) low-boilers are separated from the mixture by distillation, (ii) high-boilers are separated from the mixture by distillatio... | 07/05/2005 |
| 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 introducing the mixture into a first distillation column, separating... | 05/03/2005 |
| 6846959 | Process for producing alkanolamines A process for producing an alkanolamine includes supplying a reactive distillation apparatus having an inner contacting surface which simultaneously facilitates a reaction process and a distillation process, feeding a first reactant including an amine represented by... | 01/25/2005 |
| 6821396 | Process for fractionating water-containing crude amine mixtures from amine synthesis A mixture containing mixture one or more amines, water, low-boilers and high-boilers, is fractioned in a process wherein (i) low-boilers are separated from the mixture by distillation, (ii) high-boilers are separat... | 11/23/2004 |
| 6818794 | Extraction of ketazine solutions Process for extracting aqueous ketazine solutions which is carried out using an aqueous ketazine solution having a salt content of 5 to 27% by weight and an ammonia content of 0 to 28% by weight to extract at temperatures of 50 to 120° C., which is characterized in... | 11/16/2004 |
| 6784320 | Amine recovery method and apparatus and decarbonation apparatus having same In a decarbonation process for removing carbon dioxide from a carbon dioxide-containing gas with the use of an amine compound-containing absorbing solution, an amine compound accompanying a decarbonated exhaust gas is efficiently recovered in the following manner: A... | 08/31/2004 |
| 6774270 | Method of removing hexafluoropropylene dimers A method of removing hexafluoropropylene dimers (“HFP dimers”), dimer hydrides and other oligomers from a fluid is described. The method comprises heating the fluid to isomerize the HFP dimers to the thermodynamic isomer, and contacting the fluid with a tertiary... | 08/10/2004 |
| 6774264 | Catalyst to improve the color stability of N,N-dialkylalkanolamines This invention relates to an improvement in a process for effecting decolorization of an alkanolamine by subjecting the alkanolamine to hydrogenation in the presence of a hydrogenation catalyst. The improvement for removing color, by-products, or both from a dialkyl... | 08/10/2004 |
| 6683217 | Process for manufacturing triethanolamine and product obtained The present invention relates to a continuous process for the manufacture of triethanolamine (TEA) comprising, in succession: (i) a step of synthesizing the TEA by continuously bringing ammonia into contact with ethylene oxide under conditions allowing th... | 01/27/2004 |
| 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 distillation in which the mixture is distilled in a distillation colu... | 07/29/2003 |
| 6573406 | High-purity alkanolamines and their production process High-purity alkanolamines, whose iron content is less than 50 ppb, are provided. Said high-purity alkanolamines can be produced by covering with an alkanolamine-resistant material at least a part of the inner wall of equipment that contacts alkanolamines ... | 06/03/2003 |
| 6515036 | Method of decomposing a polyurethane A method of recovering a decomposition product from a polyurethane, the method comprising the steps of thermally decomposing a polyurethane into a liquid containing a polyol and a urea compound which is soluble in the polyol, and solids containing a urea ... | 02/04/2003 |
| 6489373 | Method for decomposition and recovery of polyurethane resin The present invention provides a method of recovering a polyamine compound and/or a polyol compound useful for starting materials of polyurethane resin in an industrially advantageous manner by first dissolving the polyurethane resin such as polyurethane ... | 12/03/2002 |
| 6462230 | Method of and apparatus for decomposing wastes A method of decomposing wastes containing target compounds having one or more of hydrolyzable bonds of ether bond, ester bond, amide bond and isocyanate bond wherein the method comprises continuously supplying the wastes in a molten state or liquid state ... | 10/08/2002 |
| 6384216 | Purification of alkenyl compounds A process for purifying alkenyl compounds having a divalent or trivalent heteroatom in the -position relative to the double bond by distillation comprises carrying out at least two distillations in which the purified alkenyl compounds are obtained ... | 05/07/2002 |
| 6353138 | Process for purifying aqueous tertiary amine and alkanolamine solutions A process for the removal of primary and secondary amine and alkanolamine impurities from aqueous tertiary amine and alkanolamine solutions without affecting the tertiary amine and/or alkanolamine by treating these solutions with a monoaldehyde or dialdeh... | 03/05/2002 |
| 6291715 | Process for the preparation of alkanolamines having improved color quality Preparation of alkanolamines having improved color quality by treating the alkanolamine with hydrogen in the presence of a hydrogenation catalyst at elevated temperature, by using, as hydrogenation catalyst, a heterogeneous catalyst comprising Re, Ru, Rh,... | 09/18/2001 |
| 6255529 | Method of and apparatus for decomposing wastes A method of decomposing wastes containing target compounds having one or more of hydrolyzable bonds of ether bond, ester bond, amide bond and isocyanate bond wherein the method comprises continuously supplying the wastes in a molten state or liquid state ... | 07/03/2001 |
| 6153799 | Method for producing highly pure aqueous hydroxylamine solutions A very pure aqueous solution of free hydroxylamine is prepared by a process in which the dilute, aqueous hydroxylamine solution is concentrated in a column by removing hydroxylamine-containing vapors via a side take-off in the bottom of the column, and ve... | 11/28/2000 |
| 6153784 | Removal of halides from halide-containing nitrile mixtures Halides are removed from halide-containing nitrile mixtures by (a) thermally treating the halide-containing nitrile mixture, (b) subsequently adding a base to the thermally treated nitrile mixture and (c) subsequently separating off the base from the nitrile mixture. Am... | 11/28/2000 |
| 6117948 | Process for producing aliphatic amine derivative The present invention provides a process for easily producing an alkylene oxide adduct to an aliphatic amine compound which has a fully excellent color, is not turbid, and does not deteriorate in color even through long-term storage. That is, the present ... | 09/12/2000 |
| 6111142 | Process for the preparation of an aminoalcohol A process for the preparation of 3-amino-1,2-propanediol, commonly known as isoserinol, having an organic impurities content lower than 0.1% and an inorganic impurities content lower than 0.05%.... | 08/29/2000 |
| 6077976 | Process for recovery of aminoalcohols from aqueous solutions containing inorganic salts A process for recovery of aminoalcohols from aqueous solutions containing inorganic salts is disclosed. The aqueous solution which contains aminoalcohols is then mixed with a base in order to increase the ph and the solution is then extracted with an alky... | 06/20/2000 |
| 6054620 | Process for producing a tertiary amine having high quality The present invention provides a process for producing a tertiary aliphatic amine having high quality having little non-amines such as esters and alcohols, which is less colored, and which can be converted into a derivative without turbidity. That is, the... | 04/25/2000 |
| 6046362 | Recovery of amines from emulsions The instant invention is directed to a method for recovering surface active amines from an emulsion comprising the salt of the amine comprising (a) contacting an emulsion layer or phase containing surface active amine salt with an acid selected from the g... | 04/04/2000 |
| 5912387 | Amine heat stable salt neutralization having reduced solids A process is disclosed for the neutralization of amine or alkanolamine heat stable salts with aqueous KOH or with alkali metal base, such as potassium hydroxide, sodium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bica... | 06/15/1999 |
