Processes (e.g., Neutralization, Stabilization, Etc.) Patents (Class 562/115)
Decarboxylation, hydrogenation or formation of carbon-to-carbon unsaturation (Class 562/116)
Conversion of sulfur containing hetero ring compounds to sulfonic acids (Class 562/117)
Oxidation of organic sulfur compounds to sulfonic acids (Class 562/118)
Hydrolysis of sulfonyl halides (Class 562/119)
Formation of sulfonic acids or sulfonic acid salts utilizing inorganic sulfonating agents (e.g., reaction of alcohols or alkyl halides with sulfurous acid, etc.) (Class 562/120)
Purification or recovery (Class 562/124)
  • Method of preparing purified alkanesulfonic acid
    Patent number: 5583253
    Abstract: A process of preparing purified alkanesulfonic acid from crude aqueous alkanesulfonic acid containing oxidizable impurities wherein the crude material is treated with a sufficient amount of chlorine to convert the oxidizable impurities to alkanesulfonyl chloride and then hydrolyzing said alkanesulfonyl chloride to alkanesulfonic acid by heating.
    Type: Grant
    Filed: March 27, 1991
    Date of Patent: December 10, 1996
    Inventors: Phyllis A. Henderson, Steven G. Schon, Carl Postuma
  • Glycerin derivative and its pharmacological use
    Patent number: 5476863
    Abstract: A glycerin derivative having the following formula (I) or (I') and a pharmacologically acceptable salt thereof are useful to treat diseases caused by the platelet activating factor.
    Type: Grant
    Filed: September 30, 1993
    Date of Patent: December 19, 1995
    Assignee: Eisai Co., Ltd.
    Inventors: Kazuo Okano, Osamu Asano, Naoyuki Shimomura, Tetsuya Kawahara, Shinya Abe, Shuhei Miyazawa, Mitsuaki Miyamoto, Hiroyuki Yoshimura, Koukichi Harada, Junsaku Nagaoka, Tsutomu Kawata, Tsutomu Yoshimura, Hiromasa Suzuki, Shigeru Souda, Yoshimasa Machida, Kouichi Katayama, Isao Yamatsu
  • Use of surfactants in phenol sulfonate dehydration
    Patent number: 5095132
    Abstract: A process for dehydrating phenol sulfonate salts by azeotropic distillation of water wherein a surfactant such as sodium dodecylbenzene sulfonate is used to prevent the salts from agglomerating and plating out on the walls of the reaction vessel.
    Type: Grant
    Filed: November 26, 1990
    Date of Patent: March 10, 1992
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Robert B. Pinkerton
  • Process for the preparation of secondary alcohol sulfate-containing surfactant compositions
    Patent number: 5075041
    Abstract: This invention relates to a process for preparing secondary alkyl sulfate-containing surface active compositions substantially free of unreacted organic matter and water, which process comprises: a) sulfating a detergent range olefin having from about 8 to about 22 carbon atoms with concentrated sulfuric acid, b) neutralizing the product of step a) with a base dispersed in a nonionic surfactant having a boiling point higher than that of said detergent range olefin and its corresponding secondary alcohol, c) saponifying the product of step b), d) passing the product of step c) through a thin film evaporator to evaporate unreacted organic matter from said product and recovering said product.
    Type: Grant
    Filed: June 28, 1990
    Date of Patent: December 24, 1991
    Assignee: Shell Oil Company
    Inventor: Eugene F. Lutz
  • Method of preparing alkali metal fluoroalkylsulfonates of high purity
    Patent number: 4925975
    Abstract: In preparing a fluoroalkylsulfonate RfSO.sub.3 M, where Rf is a perfluoroalkyl gruop having not more than 6 carbon atoms and M is an alkali metal, by neutralization reaction between a fluoroalkylsulfonic acid RfSO.sub.3 H and an alkali metal carbonate or hydroxide, the reaction is carried out under acidic conditions such that at the end of the reaction pH of the reaction liquid is lower than 6, and preferably not higher than 3. By so maintaining the reaction liquid acidic, the obtained RfSO.sub.3 M becomes very low in the concentrations of anionic impurities such as free fluorine, free chlorine and carbonate radical and, besides becomes low in moisture absorbency.
    Type: Grant
    Filed: April 21, 1989
    Date of Patent: May 15, 1990
    Assignee: Central Glass Company, Limited
    Inventors: Minoru Aramaki, Kimitaka Okamoto, Hiroaki Sakaguchi, Tamio Nakamura