Quotables
"The horse is here to stay, the automobile is only a novelty - fad."
President of Michigan Savings Bank ; 1903
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Application No. | Application Title | Issue Date |
| 20100256415 | Method and apparatus for separating and refining high purity 2,6-naphthalene dicarboxylic acid using crystallization The present invention relates to a method for separating and refining high purity 2,6-naphthalene dicarboxylic acid having an excellent color and purity of 99.9% or more by using crude 2,6-naphthalene dicarboxylic acid. And more particularly, the present invention relat... | 10/07/2010 |
| 20100174111 | PROCESS FOR PURIFICATION OF ARYL CARBOXYLIC ACIDS Disclosed herein is a process for purifying aryl carboxylic acids, in particular terephthalic acid, wherein the impure acid is dissolved or dispersed in an ionic liquid and a non-solvent is added to precipitate the purified acid. The present disclosure further relates t... | 07/08/2010 |
| 20100105907 | CONTINUOUS ANTISOLVENT CRYSTALLIZATION PROCESS AND SYSTEM USING PLUG FLOW REACTORS A process and system for continuous crystallization of a compound using antisolvent addition in which a solution is prepared with an organic compound and a solvent. An antisolvent is added to the solution in a continuous plug flow system comprising at least one process ... | 04/29/2010 |
| 20100036155 | METHOD AND APPARATUS FOR THE PURIFICATION OF HIGH-PURITY 2,6-NAPHTHALENE DICARBOXYLIC ACID Disclosed is a method for purifying 2,6-naphthalenedicarboxylic acid (NDA) that is present in a solid state in a solution. According to the method, sintered metal membrane filtration units are used to efficiently separate and purify 2,6-naphthalenedicarboxylic acid sepa... | 02/11/2010 |
| 20100004484 | METHOD OF REPLACING DISPERSION MEDIUM A method of replacing a first dispersion medium in a starting slurry composed of the first dispersion medium and isophthalic acid crystals with a second dispersion medium. The starting slurry is tangentially fed to a vertically extending cylindrical portion of a cyclone... | 01/07/2010 |
| 20090182169 | METHOD OF CRYSTALLIZATION The present invention relates to a multi-stage crystallization process which comprises the steps of feeding a solution of terephthalic acid or a slurry (raw slurry) containing terephthalic acid partially precipitated to a first crystallization vessel to precipitate the ... | 07/16/2009 |
| 20080275271 | Process for Preparing Purified Terephthalic Acid The present invention relates to a process for preparing purified terephthalic acid [PTA,], comprising the steps: dissolving crude terephthalic acid [CTA] in an aqueous medium in a reactor; hydrogenating CTA at a temperature of about 260-320° C. and a pressure of about... | 11/06/2008 |
| 20070015935 | Method for producing high purity terephthalic acid In the process for producing a high-purity terephthalic acid of the invention, a slurry of crude terephthalic acid crystals dispersed in an acetic acid solvent, which is produced by a liquid-phase oxidation of p-alkylbenzene in the acetic acid solvent, is continuously c... | 01/18/2007 |
| 20060287553 | Method of stabilizing 1,4-dihydroxy-2-naphthoic acid A method for stabilizing 1,4-dihydroxy-2-naphthoic acid, which comprises reducing an oxygen dissolved in a solution containing 1,4-dihydroxy-2-naphthoic acid, and food or drink containing 1,4-dihydroxy-2-naphthoic acid. ... | 12/21/2006 |
| 20050288527 | Method for preparing free-flowing crystalline material An improved process for making a high purity, crystalline aromatic dicarboxylic acid product which includes at least one step for crystallizing the product and wherein the crystallized product is thereafter subjected to a drying step. The improved process further includ... | 12/29/2005 |
| 20050283022 | Filtrate preparation process for terephthalic acid filtrate treatment A process for the production of terephthalic acid comprising: a. discharging from an oxidation reactor a crude stream comprising crude terephthalic acid solids, catalyst, impurities, and solvent, and b. without adding a fresh feed of solvent to said crude stream, separa... | 12/22/2005 |
| 20050261518 | Method for refining 2,6-naphthalene dicarboxylic acid The present invention relates to a method for refining 2,6-naphthalene dicarboxylic acid, and particularly to a method for refining 2,6-naphthalene dicarboxylic acid comprising recrystallizing crude 2,6-naphthalene dicarboxylic acid in the form of an amine salt using a ... | 11/24/2005 |
| 20050228195 | Purification of carboxylic acids by complexation with selective solvents A method and apparatus for purifying carboxylic acids is disclosed. A mixture containing crude carboxylic acid is contacted with a selective crystallization solvent to form a slurry of a salt complex of the carboxylic acid and the selective crystallization solvent. The ... | 10/13/2005 |
