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| Number | Title | Issue Date |
| 7332085 | Method for the purification of an α-hydroxy acid on an industrial scale The present invention relates to a method for the purification of an α-hydroxy acid on an industrial scale, in which the method involves: (a) subjecting an aqueous stream containing mainly α-hydroxy (1) to an extraction step, with the formation of an aqueous place... | 02/19/2008 |
| 7311837 | Process for the continuous recovery of free tartaric acid from raw materials containing potassium hydrogentartrate In a process for the continuous recovery of free tartaric acid from raw materials containing potassium hydrogentartrate, the same are mixed with water and the potassium hydrogentartrate is dissolved. The process is improved in that the suspension is decanted, the cl... | 12/25/2007 |
| 7270752 | Process for purifying lactams A process is described for purifying lactams, in particular the lactams obtained by cyclizing hydrolysis of an aminoalkylnitrile, and more particularly to the purification by crystallization of ε-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile. Th... | 09/18/2007 |
| 7211193 | Processes for the purification of bis(2-hydroxyethyl)terephthalate A method is disclosed for efficiently obtaining BHET of high purity from an EG (ethylene glycol) solution containing crude BHET (bis(2-hydroxyethyl)terephthalate), especially a decomposition product solution obtained by decomposing a polyester containing PET (polyet... | 05/01/2007 |
| 7014832 | Simultaneous recovery of potassium chloride and KCL enriched edible salt The present invention relates to recovery of industrial grade potassium chloride and low sodium edible salt from bittern as part of an integrated process. The process comprises, mixing low sulphate concentrated feed bittern (a by-product of salt industry) of density... | 03/21/2006 |
| 6960300 | Process for preparing water soluble diterpenes and their applications Aqueous solutions of diterpenes such as Forskolin, its congeners, analogs and derivatives, up to approximately 6% concentration, are prepared using suitably substituted cyclodextrin as a solubilizing agents. In the absence of cyclodextrin, some diterpenes such as Fo... | 11/01/2005 |
| 6896807 | Capacitor electrolyte recovery A method for recovering and recycling expensive and hazardous components from capacitors containing an electrolyte salt dissolved in an aprotic organic solvent. The method includes disintegrating a plurality of capacitor casings and their contents into fragments and... | 05/24/2005 |
| 6855176 | Emulsion crystallisation with recycle A method for purifying substances through emulsion crystallisation is described, whereby (a) an emulsion of organic liquid droplets in a continuous water phase containing the impure substance is formed; (b) the emulsion is super-saturated in the substance; (c) cryst... | 02/15/2005 |
| 6346523 | Budesonide particles and pharmaceutical compositions containing them The invention provides finely divided, substantially crystalline particles of budesonide characterized in that they are substantially smooth and having a BET value from 1 to 4.5 m2 /g, process for their preparation, a pharmaceutical composition... | 02/12/2002 |
| 6221153 | Method for producing large crystals of complex molecules Compressed gases, liquefied gases, or supercritical fluids are utilized as anti-solvents in a crystal growing process for complex molecules. Crystals of the present invention exhibit greater crystal size and improved morphology over crystals obtained by c... | 04/24/2001 |
| 5851490 | Method for utilizing PH control in the recovery of metal and chemical values from industrial waste streams An improved method for the recovery of metal and/or chemical values from an industrial waste stream containing zinc, cadmium, lead and/or iron compounds by heating the waste stream in a reducing atmosphere, treating the resultant fumes in an ammonium chlo... | 12/22/1998 |
| 5846501 | Process for the selective recovery of the salt constituents from used hardening shop salts which contain nitrite-nitrate In order to recover in an environmentally sound and economic manner used hardening shop salts which contain nitrate-nitrite, the salts, comminuted to particle sizes of from 1 to 50 mm, are dissolved in a mixture of nitric acid and hydrogen peroxide withou... | 12/08/1998 |
| 5314506 | Crystallization method to improve crystal structure and size Impinging fluid jet streams are used in a continuous crystallization process to achieve high intensity micromixing of fluids so as to form a homogeneous composition prior to the start of nucleation. This process permits direct crystallization of high surf... | 05/24/1994 |
| 5230769 | Process and apparatus for separating substances by crystallization A process is provided for the separation of substances by melt crystallization. The organic mixtures which are difficult to crystallize are heated to a temperature sufficient to obtain a melt with the melt then being moved through a three-dimensional crys... | 07/27/1993 |
| 5104478 | Method for making single crystals A method for making single crystals, comprising osmotically removing the solvent from a solution containing the material to be grown into a crystal.... | 04/14/1992 |
| 5090965 | Process for the separation of substances by cooling crystallization In the process for the separation of substances by cooling crystallization, the mixture remaining in the crystallizer after separation of the crystal layer is removed and the crystal layer is melted. The process is distinguished in that the mixture, which... | 02/25/1992 |
| 4822585 | Silicon purification method using copper or copper-aluminum solvent metal A method for purifying silicon comprises the steps of providing a body of molten silicon-rich material in a solvent metal comprising copper or copper-aluminum combination and extracting heat therefrom to provide a solid phase containing silicon in crystal... | 04/18/1989 |
| 4734102 | Process for concentrating a suspension An apparatus for concentrating a suspension consisting of a hollow cylinder in which one or more tubes of a constant outward diameter extend in axial direction, in the wall of each tube at least one filter being mounted forming the only direct connection ... | 03/29/1988 |
| 4729888 | Process of recovery of sulphur from minerals containing pyrites Production of elementary sulphur from an iron sulphide mineral, which comprises oxidizing acid lixiviation of the pulverized mineral, for extraction of the sulfur. The pulp obtained from the lixiviation is treated in the hot with an organic solvent for su... | 03/08/1988 |
| 4657559 | Process for seed crystal preparation for phosphoric acid crystallization The present invention relates to the processing of phosphoric acid by crystallization starting with phosphoric acid and adding relatively large amounts of fine, relatively pure seed crystals to acid which has been cooled to supersaturated conditions. Crys... | 04/14/1987 |
| 4655790 | Phosphoric acid crystallization process The present invention relates to the processing of phosphoric acid by crystallization. Wet-process phosphoric acid is purified by cooling it to supersaturated conditions and adding relatively large amounts of fine, relatively pure seed crystal. Crystalliz... | 04/07/1987 |
| 4655789 | Phosphoric acid crystallization process The present invention discloses a new method for obtaining a crystallized phosphoric acid of relatively high purity starting with conventional phosphoric acid. The new method is based on crystallization of orthophosphoric acid hemihydrate from the phospho... | 04/07/1987 |
| 4597768 | Method for treatment in counter current of suspended particles with a liquid A method for treating in counter current of suspended particles with a liquid, whereby the particles and the liquid are transferred in opposite directions through a contact zone which, at some places, spaced in axial direction, is stirred in planes perpen... | 07/01/1986 |
| 4507244 | Method for crystallizing a substance from a solution In the crystallization of a substance from a solution, in particular the crystallization of fats from a mother liquor containing solvents, the solution is rapidly cooled (I) to a temperature below the crystallization temperature. This supercooled and henc... | 03/26/1985 |
| 4385902 | Process for purifying crystalline potassium chloride Industrially crystallized potassium chloride having a potassium chloride content of at least 95 weight percent and containing a minor contaminating amount of inorganic metal salt impurities, e.g., sodium chloride, is purified by leaching compacted particl... | 05/31/1983 |
| 4087253 | Method of obtaining caustic soda from a sodium chloride liquor containing sulphate ions recovered from an electrolytic cell A method of obtaining caustic soda and pure sodium chloride from an electrolytic cell liquor containing also sulfate ions including the steps of concentrating the liquor through multiple effect evaporation, cooling the concentrate obtained, separating the... | 05/02/1978 |
| 4072472 | Production of high purity salt from high sulfate salt deposits A subterranean salt deposit is solution mined, and the resulting calcium- and sulfate-contaminated brine is treated, e.g., by soda ash, to precipitate insoluble calcium compounds. The resulting slurry is settled, and the effluent clear brine is evaporated... | 02/07/1978 |
| 4065270 | Process for purifying sodium hydroxide An aqueous solution of sodium hydroxide containing soluble impurities such as a concentrated catholyte produced by a diaphragm electrolysis is cooled by a coolant or a heat-exchanger to form a slurry containing sodium hydroxide hydrate crystals and fine i... | 12/27/1977 |
| 3953582 | Process for the separation of sodium azide A process is provided for the continuous separation of suspended basic alkali metal azide particles from a liquid reaction medium by bringing the liquid reaction medium into contact with a non-reactive mineral oil whereby the suspended metal azide particl... | 04/27/1976 |
