Patents by Inventor Enrico Bondi

Enrico Bondi 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).

  • Method of purifying caprolactam
    Patent number: 4606858
    Abstract: The invention is concerned with a method of purifying caprolactam as obtained by Beckmann transposition or by nitrosation of cyclohexyl compounds, characterized in that it comprises the following steps:(a) the caprolactam oil is treated with ammonia to obtain a pH in the 8 to 10 range;(b) the caprolactam in water-ammonia solution yielded by (a) is extracted with toluene;(c.sub.1) any caprolactam still in the toluene solution yielded by (b) is treated with NaOH;(C.sub.2) the aqueous phase left over from the extraction with toluene (b) is removed.
    Type: Grant
    Filed: February 7, 1985
    Date of Patent: August 19, 1986
    Assignees: Snia BPD S.p.A., Chimica del Friuli S.p.A.
    Inventors: Enrico Bondi, Paolo Senni