| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 562113000 | Halogen attached indirectly to the sulfonate group by acyclic nonionic bonding | 12 |
| 20090137840 | Fluorinated Alkanesulfonic Acid Anhydrides and Processes for Making the Same - The invention provides a process for the preparation of fluorinated alkanesulfonic acid anhydrides by contacting alkanesulfonic acids with phosphorus pentoxide, the phosphorus pentoxide being provided as a dispersion in an inert oil. The invention also provides novel fluorinated alkanesulfonic acid anhydrides including 2-hydrotetrafluoroethanesulfonic acid anhydride. | 05-28-2009 |
| 20090143613 | POTASSIUM PERFLUOROALKANESULFONATE AND METHOD FOR PRODUCING THE SAME - This method for producing a potassium perfluoroalkanesulfonate includes an electrochemical fluorination step in which an alkanesulfonyl halide compound is subjected to electrochemical fluorination in anhydrous hydrogen fluoride, thereby to generate a production gas containing perfluoroalkanesulfonyl fluoride as the main component. In addition, for example, the methods may include a gas absorption step in which the production gas is reacted with an aqueous solution of potassium hydroxide, thereby to generate a gas absorbed solution containing potassium perfluoroalkanesulfonate, a purification step in which impurities such as potassium fluoride, potassium hydroxide, and potassium sulfate, are removed, and a concentration and collection step in which the aqueous solution from which the impurities are removed is concentrated and dried. In the electrochemical fluorination, for example, it is possible that the proton concentration in the reaction solution is maintained in the range of 150 to 1,500 ppm to suppress the formation of byproducts. | 06-04-2009 |
| 20100145093 | Manufacture of Hydrofluoroalkanesulfonic Acids - A process for manufacture of hydrofluoroalkanesulfonic acid with at least one hydrogen bonded to the carbon atom adjacent to the carbon atom bonded to the sulfonic acid group comprising: contacting a fluoroolefin with sulfite in an aqueous solution adjusted to about pH 4 to pH 12; removing water from the solution to form a solid; directly treating the solid with oleum; and distilling the hydrofluoroalkanesulfonic acid therefrom. Also a process for manufacture of potassium hydrofluoroalkanesulfonate in high purity is described. | 06-10-2010 |
| 20100324330 | Process for Preventing Development Defect and Composition for Use in the Same - The composition for preventing development-defects containing (1) an ammonium salt, a tetraalkylammonium salt or a C | 12-23-2010 |
| 20110034724 | METHOD FOR PREPARING A TRIFLUOROMETHANESULFINIC ACID SALT - The present invention relates to a method for preparing a salt of trifluoromethanesulphinic acid termed “triflinic acid”. More specifically, the invention relates to a method for preparing a highly pure triflinic acid salt. The method of the invention for preparing a highly pure triflinic acid salt, starting from an aqueous mixture comprising the latter combined with a trifluoroacetic acid salt and saline impurities resulting from the method for preparing same, is characterized in that said mixture is subjected to the following operations: first controlled acidification such that the trifluoroacetic acid salt is essentially released in the acid form thereof, the majority of the triflinic acid remaining in a salified form, optional separation of the salts originating from the acid having been used for the acidification and recovery of an aqueous phase, separation of the trifluoroacetic acid from the separated aqueous phase comprising the alkaline salt of triflinic acid, trifluoroacetic acid, triflinic acid and the excess strong acid, therefore resulting in an aqueous phase depleted of trifluoroacetic acid but comprising the alkaline salt of triflinic acid, recovery of the alkaline salt of triflinic acid from the aqueous phase. | 02-10-2011 |
| 20110269989 | METHOD OF MAKING ALKYLENE GLYCOLS - A method for halogenating, sulfonating, or sulfo-halogenating a feed comprising paraffin, by subjecting a mixture comprising the feed and a reagent selected from the group consisting of sulfonating agents, halogenating agents, and combinations thereof to a shear rate of at least 20,000 s | 11-03-2011 |
| 20110269990 | PROCESS FOR PRODUCING PERFLUOROALKYLSULFONIC ACID SALT - In this method for producing a perfluoroalkylsulfonic acid salt, there is provided a method for producing a perfluoroalkylsulfonic acid salt with a low fluorine content, which is a simple method to achieve a high yield, | 11-03-2011 |
| 20120065425 | PURIFICATION OF FLUOROALKANESULFONATE SALTS - A process for the purification of fluoroalkanesulfonate salt comprising (a) contacting a mixture of said salt and an inorganic salt contaminant with a solvent to selectively dissolve said fluoroalkanesulfonate salt in solution, and (b) isolating the solution, to yield a fluoroalkanesulfonate salt containing less than 500 micrograms of inorganic salt contaminant per gram of fluoroalkanesulfonate salt, or containing less than a maximum of 0.3% by weight of individual solvent. | 03-15-2012 |
| 20120302787 | PROCESS FOR PRODUCING PERFLUOROBUTANESULFONIC ACID SALT - A process for producing a perfluorobutanesulfonic acid salt (PFBS salt) is provided. By the process, the yield is improved and PFOS salt content is reduced. Electrochemical fluorination is conducted in a reaction solution comprising anhydrous hydrogen fluoride to generate perfluorobutanesulfonyl fluoride, and the fluoride is hydrolyzed to produce a perfluorobutanesulfonic acid salt. The process for producing a perfluorobutanesulfonic acid salt includes: a step in which liquid phase components generated in the electrochemical fluorination cell are withdrawn and a first a perfluorobutanesulfonic acid salt fraction is prepared therefrom; and a step in which gaseous phase components discharged from the electrochemical fluorination cell are collected and a second perfluorobutanesulfonic acid salt fraction is prepared therefrom. The reaction solution in the electrochemical fluorination cell is regulated so as to have a perfluorooctanesulfonyl fluoride content of 500 ppm or lower by withdrawing the liquid phase components from the electrochemical fluorination cell. | 11-29-2012 |
| 20140171678 | Fluoroalkanesulfonic Acid Production Method - Disclosed is a method for producing a fluoroalkanesulfonic acid including (1) the step of reacting concentrated sulfuric acid and/or fuming sulfuric acid with a fluoroalkanesulfonate to cause an acid decomposition, thereby obtaining a reaction mixture containing the fluoroalkanesulfonic acid and a sulfur component; and (2) the step of adding an oxidizing agent to the reaction mixture obtained by the above step and then conducting a distillation, thereby obtaining the fluoroalkanesulfonic acid from the reaction mixture. It is possible by this method to efficiently reduce the sulfur component, thereby industrially advantageously obtaining fluoroalkanesulfonic acid of high purity. | 06-19-2014 |
| 20150065746 | FLUOROSURFACTANTS HAVING IMPROVED BIODEGRADABILITY - To address the problem of insufficient biodegradability of perfluorinated surfactants, the present invention provides biodegradable fluorosurfactants derived from olefins having —CHR, —CHRf, —CHF, and/or —CH | 03-05-2015 |
| 20160068477 | METHOD OF MANUFACTURING SULTONIUM SALT - Provided is a sulfonium salt manufacturing method which can reduce the production of a monosulfonium salt. A method of manufacturing a sulfonium salt includes preparing a first sulfonium salt containing a sulfonium cation and a first anion, preparing a second sulfonium salt by exchanging the first anion for a halide ion, and preparing a third sulfonium salt by exchanging the halide ion for a second anion. | 03-10-2016 |
