Patents by Inventor Antonio Bigliani

Antonio Bigliani has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for separating and recovering the constituents of an exhausted solvent mixture used for cleansing reactors for the polymerization of vinyl chloride
    Patent number: 4043874
    Abstract: The constituents of an exhausted toluene-dimethylformamide solvent mixture used for removing polyvinyl chloride deposits from polymerization reactors, are separated by adding water to said mixture and distilling off toluene, thereby to obtain a distillation residue having a water content of at least 2 wt.% and a toluene content not exceeding 10 wt.%, precipitating the polymer by cooling the distillation residue, adding a further amount of water, distilling off any toluene present, recovering the precipitate and distilling the residual aqueous solution to recover the dimethylformamide.
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: August 23, 1977
    Assignee: Societa' Italiana Resine S.I.R. S.p.A.
    Inventors: Francesco Testa, Antonio Bigliani
  • Process for cleaning vinyl chloride polymerization reactors
    Patent number: 3997360
    Abstract: Polymeric deposits formed on internal surfaces of the reactors during polymerization or copolymerization of vinyl chloride are removed by dissolving them at a temperature above 60.degree. C with a solvent mixture comprising from 0 to 7% by weight of water, the remainder consisting of toluene and dimethylformamide in a weight ratio of toluene to dimethylformamide of from 50:50 to 90:10.
    Type: Grant
    Filed: August 11, 1975
    Date of Patent: December 14, 1976
    Assignee: Societa' Italiana Resine S.I.R. S.p.A.
    Inventors: Francesco Testa, Antonio Bigliani