With Preservative Or Stabilizer Patents (Class 558/481)
  • Process for the mononitration of alkanediols
    Patent number: 7335789
    Abstract: A process for the preparation of compounds of formula (I): HO-A-ONO2??(I) wherein A is a C2-C6 alkylene chain, the compounds of formula (I) being synthesized by nitration of the corresponding alkanediols with “stabilized” nitric acid is herein disclosed. The process is safer to operators and allows to obtain advantageous yields on an industrial scale.
    Type: Grant
    Filed: November 6, 2003
    Date of Patent: February 26, 2008
    Assignee: Dipharma S.p.A.
    Inventors: Nevio Francescutti, Tiziano Scubla, Fausto Gorassini, Graziano Castaldi
  • Nitration of alkanols
    Patent number: 5162568
    Abstract: A process for nitrating alkanols containing 5-13 carbon atoms is disclosed. The nitation takes place at 15.degree.-45.degree. C. using a mixed acid containing 20-30% nitric acid, 55-60% sulfuric acid and 15-20% water, and 2-5%, based on mixed acid, of a stabilizer selected from the class consisting of urea, sulfamic acid and hydrazine.
    Type: Grant
    Filed: April 6, 1988
    Date of Patent: November 10, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Charles F. Douty