Purification Or Recovery Patents (Class 564/437)
By salt formation (Class 564/438)
Of compound having amino nitrogen and hydroxy bonded directly to the benzene ring (h of -oh may be replaced by a substituted or unsubstituted ammonium ion or a group ia or iia light metal) (Class 564/439)
  • Preparation of p-aminodiphenylamines
    Patent number: 4313002
    Abstract: A method of preparing p-aminodiphenylamines from diphenylamines is described whereby neither the N-nitrosodiphenylamine or the p-nitrosodiphenylamine need be isolated. The method rests on the discovery that alkali metal salts of p-nitrosodiphenylamines are soluble in non-aqueous organic solvent systems consisting of certain aromatic hydrocarbons and saturated aliphatic alcohols, and that such salts can be readily hydrogenated in their non-aqueous solution to the corresponding p-aminodiphenylamine.
    Type: Grant
    Filed: October 29, 1980
    Date of Patent: January 26, 1982
    Assignee: UOP Inc.
    Inventors: Ted Symon, Paul R. Kurek, Michael D. Tufano
  • Hydrolytic decomposition method
    Patent number: 4281197
    Abstract: Porous polyurethane solids such as open cell polyurethane foams are rapidly heated and hydrolytically decomposed into separate polyol component and diamine component by contacting the porous solids with saturated steam in a heated vacuum chamber. Separation of high quality liquid polyol and diamine is achieved.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: July 28, 1981
    Assignee: Ford Motor Company
    Inventor: Fred G. Oblinger
  • Process for producing methylhydrazines
    Patent number: 4281198
    Abstract: Methylhydrazines are produced in high yield by reaction of trimethylanilinium halide with hydrazine or monomethylhydrazine at a reaction temperature of 80.degree. to 130.degree. C. for at least 3 hours.Methylhydrazines are useful compounds in the fields of chemical industry, such as manufacturing pharmaceuticals or agricultural chemicals, and space weapon industry.
    Type: Grant
    Filed: July 10, 1980
    Date of Patent: July 28, 1981
    Assignee: Japan Hydrazine Co., Inc.
    Inventors: Shiro Hojo, Yoichi Hasegawa, Tuyoshi Ichimiya, Kazuo Kimura
  • Production of 2,4- and 2,6-diaminotoluenes
    Patent number: 4256671
    Abstract: A process for the manufacture of 2,4- and 2,6-diaminotoluenes comprises catalytically hydrogenating the corresponding molten nitro compound in the presence of water, adding hydrochloric acid to form the monohydrochlorides, crystallizing 2,6-diaminotoluene monohydrochloride, filtering it off and, if desired, liberating the free bases by addition of an alkali.
    Type: Grant
    Filed: May 11, 1979
    Date of Patent: March 17, 1981
    Assignee: Clayton Aniline Company, Ltd.
    Inventors: John D. Hildreth, David G. Haslam, David E. Allen