| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 562554000 | Purification or recovery per se | 24 |
| 20080300421 | Process for purifying theanine - The present invention provides a process for purifying theanine from an aqueous solution having a dominant cation and comprising impurities. The process comprises the steps of: introducing the aqueous solution into a column in an amount of from 2 to 20% of the column volume, wherein the column is packed with a cation exchange resin of the same cation type as the dominant cation; then introducing an aqueous mobile phase having a pH of from 2.5 to 8.5 into the column thereby to elute a zone enriched in the impurities followed by a zone enriched in theanine; and then recovering at least one fraction of the zone enriched in theanine. | 12-04-2008 |
| 20090054685 | Methods for Purifying Amino Acids - In the method for separating and purifying a basic amino acid, preferably the basic amino acid selected from arginine, lysine or ornithine from a culture containing the amino acid, the culture containing the a basic amino acid and microbial cells, preferably the culture whose pH is 4 to 10, is charged onto the top of a column filled with a weak acid cation exchange resin whose particle size is 300 μm or more and passed therethrough, and then an eluent is poured into the column from the top thereof whereby accomplishing the separation and the purification of the basic amino acid. | 02-26-2009 |
| 20090062565 | Continuous Process for the Production of mono- or dicarboxylic acid alkyl amides - A continuous process for the production of mono- or dicarboxylic acid alkyl amides is described, which is characterized in that: fresh mono- or dicarboxylic acid is placed into a first reactor (R | 03-05-2009 |
| 20090192331 | PROCESS FOR THE PREPARATION OF (R)-(-)-3-(CARBAMOYLMETHYL)-5-METHYLHEXANOIC ACID AND OF PREGABALIN AND SYNTHESIS INTERMEDIATES - This invention relates to the preparation of (R)-(−)-3-(carbamoylmethyl)-5- methylhexanoic acid, in particular, the resolution of the acid racemate by means of salification with optically active amines and subsequent acidification to give the (R) enantiomer of the acid; this invention also concerns the salt intermediates formed with said amines and the conversion of said (R)-(−)-3-(carbamoylmethyl)-5- methylhexanoic acid into biologically active molecules such as pregabalin. | 07-30-2009 |
| 20090318730 | Method of Separating and Collecting Optically Active Amino Acid Amide - [Problems] To provide a method for efficiently separating and collecting an optically active amino acid amide and an optically active amino acid which are highly important substances as intermediates in the production of various industrial chemicals, agricultural chemicals, and pharmaceuticals, from an aqueous solution containing the optically active amino acid amide and the optically active amino acid. | 12-24-2009 |
| 20100048947 | PURIFICATION METHOD OF 4-HYDROXYISOLEUCINE - (2S,3R,4S)-4-hydroxyisoleucine or a chemically acceptable salt thereof may be purified and separated by:
| 02-25-2010 |
| 20100267986 | PROCESS FOR THE PREPARATION OF BETAINES - Betaines of formula R | 10-21-2010 |
| 20100324334 | ALKALI METAL SALT OF GLUTAMIC ACID N,N-DIACETIC ACID, A PROCESS TO PREPARE SUCH SALT, AND THE USE THEREOF - The present invention relates to an alkalimetal salt of glutamic acid-N,N-diacetic acid (GLDA) of the formula Na | 12-23-2010 |
| 20110015433 | Simple preparation of trifluoromethionine and derivatives thereof - Disclosed is a process for the simple preparation of trifluoromethionine, its analogs trifluoromethylcysteine, fluoroalkylhomocysteines, and fluoroalkylcysteines, and derivatives of them. These compounds are drug-candidate compounds or raw materials of drug-candidate compounds. Specifically, trifluoromethionine, trifluoromethylcysteine, a fluoroalkylhomocysteine, or a fluoroalkylcysteine is simply and conveniently prepared directly without passing through homocysteine or cysteine by adding metallic sodium to an optically active or racemic homocystine or cystine in liquid ammonia and further adding a fluoroalkyl iodide thereto under Birch reduction conditions. | 01-20-2011 |
| 20110118503 | METHODS FOR THE PRODUCTION OF L-CARNITINE - Subject of the invention is a method for the production of L-carnitine, comprising the steps of
| 05-19-2011 |
| 20110160483 | PROCESS FOR THE SEPARATION OF ORGANIC ACIDS AND AMINO ACIDS FROM FERMENTATION BROTHS - The present invention relates to a solid bed adsorptive separation of organic acid and/or amino acids from fermentation broths containing organic acid and/or amino acid. | 06-30-2011 |
| 20110245536 | PROCESS FOR PREPARING PREGABALIN - Disclosed herein is an improved, commercially viable and industrially advantageous process for the preparation of pregabalin in high yield and purity. The present invention also provides a process for the purification of (S)-pregabalin. | 10-06-2011 |
| 20110263896 | Process for Enantioseparation of Chiral Systems with Compound Formation Using Two Subsequent Crystallization Steps - Method for enantioseparation of a chiral system with compound formation comprising a pair of enantiomers. The method comprises the steps of: placing the chiral system to be processed, which is optically enriched by a target enantiomer, in the 3-phase region of the ternary phase diagram of chiral compound forming systems to achieve the establishment of the solid/liquid phase equilibria; phase-separating the liquid and solid phase formed by the placing step; shifting the eutectic composition of the remaining liquid towards a lower eutectic composition (x | 10-27-2011 |
| 20110288332 | AMINOCARBOXYLATE POWDERS WITH IMPROVED PURITY AND FLOWABILITY PROPERTIES - Provided is a method for preparing stable free flowing solid aminocarboxylate chelants by adding to a chelant that contains residual alkaline metal hydroxide a free or partially neutralized carboxylic acid such that the free or partially neutralized acid neutralizes at least a portion of the alkaline metal hydroxide; and isolating therefrom the free-flowing solid chelant. | 11-24-2011 |
| 20120035394 | PROCESS FOR THE RECOVERY OF BETAINES FROM ELECTRODIALYSIS WASTE STREAMS - The present invention discloses a process for the recovery of betaines from electrodialysis (ED) waste streams, whereby said waste streams are treated with a pressure driven membrane process. | 02-09-2012 |
| 20120142963 | PROCESS FOR PRODUCING COCOA HUSK EXTRACT - A process for producing a cocoa husk extract containing gamma-aminobutyric acid (GABA) is provided, the process comprising: a) extracting GABA and methylxanthines from cocoa husks with an aqueous medium thereby to form an aqueous solution containing GABA and methylxanthines; b) removing at least part of the methylxanthines from the aqueous solution with a solvent which is immiscible with water; and c) retaining the aqueous solution containing the GABA. A cocoa husk extract comprising GABA and methylxanthines wherein the ratio of GABA to methylxanthines is at least 1:20 and a food product containing such an extract are also provided. | 06-07-2012 |
| 20120238777 | METHOD AND DEVICE FOR CONCENTRATING MATERIAL SOLUTIONS - A method is provided for concentrating a material solution using at least two consecutive membrane separating stages, each stage for separating the material solution into a retentate and a permeate. The cut-off of the membranes used in the separating stages is higher than that of the membrane used in the previous stage. The retentate of each separating stage, with the exception of the last stage, is fed to the following separating stage as a feed, and the permeate from at least one separating stage is fed back to a preceding separating stage and introduced into the feed thereof. The fed-back permeate has a concentration and viscosity that substantially corresponds to the concentration and viscosity of the preceding separating stage into which the permeate is introduced. | 09-20-2012 |
| 20120296116 | Process for the Production of L-Citrulline - Processes for producing a suitable purity grade of L-Citrulline are disclosed. The processes can include contacting crude L-Citrulline in an aqueous solution with an adsorptive medium at a temperature above approximately 50° C. and below the temperature of denaturement for the L-Citrulline for an interval sufficient to remove at least one contaminant from the L-Citrulline. The processes can also include concentrating the dissolved L-Citrulline relative to the aqueous solution. | 11-22-2012 |
| 20130204040 | AN APPARATUS FOR CONTINUOUS SEPARATION OF VALINE AND A METHOD FOR CONTINUOUS SEPARATION OF VALINE USING THE SAME - The present invention relates to an apparatus for continuous separation of valine from the mixture comprising amino acids such as leucine, isoleucine, etc. and a method for continuous separation of valine by using the same, and the present invention can continuously separate valine from the mixture comprising amino acids such as leucine, isoleucine, etc. in a high purity and yield. | 08-08-2013 |
| 20140031586 | METHOD FOR PURIFYING L-CYSTEINE - The invention relates to a method for producing a purified solution containing L-cysteine from a fermentation broth containing L-cysteine. In said method, the fermentation broth containing L-cysteine, at a pH value from pH 6 to 9, is brought in contact with a basic anion exchanger, wherein the L-cysteine bonds to the anion exchanger. The anion exchanger is then rinsed with a first washing solution, and the bonded L-cysteine is removed from the anion exchanger by means of an acid and transferred into an eluate. Said eluate, having a pH≦4, is brought in contact with an acidic cation exchanger, wherein the L-cysteine bonds to the cation exchanger. The cation exchanger is rinsed with a second washing solution, and the bonded L-cysteine is removed from the cation exchanger by means of a strong acid. | 01-30-2014 |
| 20140256984 | DEVICES AND METHODS FOR CRYSTALLIZATION - The invention in some aspects relates to devices and methods for nucleating crystals under controlled conditions. In some aspects of the invention, devices and methods are provided for continuous crystallization. | 09-11-2014 |
| 20150038739 | METHOD FOR MANUFACTURING REFINED METHIONINE - The object of the present invention is to provide a process for producing refined methionine in which the loss of methionine due to washing is reduced. The present invention relates to a process for producing refined methionine from crude methionine, comprising a step of washing crude methionine with the use of a wash water containing methionine. | 02-05-2015 |
| 20150051422 | SOLVENT FREE PROCESS FOR PURIFICATION OF FREE BIO-AMINO ACIDS - The present invention relates to a green process for purification of free bio amino acids from plant parts, particularly tea leaves and shoots. The invention more particularly relates to an organic solvent free, fast and economical process for purification of natural amino acids on large scale without using any chemical, acid or alkali substance. The invention also relates to a process for purification of bio amino acids from plant and plant parts (renewable bioresources) which are rich in free amino acids. | 02-19-2015 |
| 20170233331 | Method for Obtaining Crystalline L-Alanine | 08-17-2017 |
