Patents Assigned to Propylox (Societe Anonyme)
  • Process for the recovery of carboxylic acid from mixtures containing glycol esters derived from these acids
    Patent number: 4358609
    Abstract: A process for the recovery of carboxylic acids from mixtures containing glycol esters derived from these acids. The process comprises reacting these mixtures at boiling with water to form carboxylic acid and entraining the carboxylic acid formed by means of the water by azeotropic distillation, so as to separate off a mixture of carboxylic acid and water. This mixture is subjected to extractive distillation by means of an organic solvent which is insoluble in water and in which water is insoluble. A mixture of water and organic solvent is thereby separated from a solution of carboxylic acid in the organic solvent.
    Type: Grant
    Filed: October 1, 1980
    Date of Patent: November 9, 1982
    Assignee: Propylox (Societe Anonyme)
    Inventor: Nicolas Hardy
  • Process for the purification of olefine oxides
    Patent number: 4304639
    Abstract: A process for the purification of olefine oxides by subjecting a mixture containing the olefine oxides to distillation in a distillation column in the presence of a small amount of water in order to obtain olefine oxide as the distillate. A fraction of the down-flow liquid is withdrawn from the column and the withdrawn fraction is subjected to decantation, so as to separate off an aqueous phase which is discarded, and an organic phase. The organic phase is returned to the column at a point located below the withdrawal point.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: December 8, 1981
    Assignee: Propylox (Societe Anonyme)
    Inventors: Nicolas Hardy, Teddy Durieux
  • Process for the purification of organic solutions of percarboxylic acids
    Patent number: 4294776
    Abstract: Organic solutions of percarboxylic acids are subjected to a wash by means of a dilute aqueous solution containing from 35 to 60% by weight of sulphuric acid, which if appropriate, is preceded by a preliminary wash by means of a concentrated aqueous solution containing more than 65% by weight of sulphuric acid.
    Type: Grant
    Filed: May 1, 1980
    Date of Patent: October 13, 1981
    Assignee: Propylox (Societe Anonyme)
    Inventors: Nicolas Hardy, Georges Dancot
  • Epoxidation
    Patent number: 4193929
    Abstract: Epoxidation of an alkene by reaction with a peroxycarboxylic acid to produce an oxirane. A peroxycarboxylic acid in organic solution is reacted with an alkene to produce a product mixture. Unreacted alkene is separated from the product mixture as a gas. The separated alkene is absorbed into the organic solution containing the peroxycarboxylic acid. The oxirane product is obtained by purification of the product mixture after the alkene has been separated. The organic solution containing the peroxycarboxylic acid is preferably obtained by countercurrently contacting an aqueous phase which includes sulfuric acid, hydrogen peroxide and water and an organic phase containing carboxylic acid and organic solvent.
    Type: Grant
    Filed: October 6, 1977
    Date of Patent: March 18, 1980
    Assignee: Propylox a Societe Anonyme
    Inventors: Anthony M. Hildon, Peter F. Greenhalgh