Patents Assigned to Caffaro, S.p.A., Societa per l'Industria Chimica ed Elettrochimica
  • Process for the production in continuous of phthalodinitrile
    Patent number: 4883894
    Abstract: The present invention relates to a process for the production in continuous of isophthalodinitrile or terephthalodinitrile by simultaneous amidation and dehydration of the respective acid chlorides in steam phase on a fixed bed of a dehydration catalyst.
    Type: Grant
    Filed: March 24, 1987
    Date of Patent: November 28, 1989
    Assignee: Caffaro s.p.a. Societa per l'Industria Chimica ed Elettrochimica
    Inventors: Enrico Pontoglio, Sandro Parodi, Giancarlo Caretti
  • Process for the preparation of tetrachloroterephthaloyl dichloride by means of the chlorination of terephthaloyl dichloride with gaseous chlorine
    Patent number: 4808345
    Abstract: The invention relates to a process for the preparation of tetrachloroterephthaloyl dichloride by means of the chlorination of terephthaloyl dichloride with gaseous chlorine, characterized in that said chlorination is carried out in the vapor phase in the presence of activated charcoal as catalyst. The invention relates also to the synthesis processes in which the compound prepared according to the process said is used as an intermediate.
    Type: Grant
    Filed: April 28, 1986
    Date of Patent: February 28, 1989
    Assignee: CAFFARO S.p.A. Societa per l'Industria Chimica ed Elettrochimica
    Inventors: Enrico Pontoglio, Sandro Parodi, Giuseppe Ghielmetti, Liborio Casale
  • Process for separating mixed monochlorotoluene isomers, a plant for carrying out the process, and the isomers separated in this manner
    Patent number: 4795839
    Abstract: The invention relates to a process for separating mixed monochlorotoluene isomers, which comprises a first stage of adsorption carried out by passing said mixture through at least one column filled with a zeolite, and a second stage of deadsorption from said zeolite carried out by passing two deadsorbents in succession in the vapor phase through the column.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: January 3, 1989
    Assignee: CAFFARO S.p.A. Societa per l'Industria Chimica ed Elettrochimica
    Inventors: Guido Niederjaufner, Achille Pontoglio, Giuseppe Storti, Massimo Morbidelli, Sergio Carra'
  • Method for preparation of inorganic flocculating composition
    Patent number: 4035259
    Abstract: The invention relates to an inorganic flocculating composition consisting of water soluble salts of Al, Fe, Mg and Ca and obtained by attacking clays containing the above chemical elements, the attack being carried out with an acid capable of forming water soluble salts of the said chemical elements. The said composition is capable of destroying the stability of colloidal slurries and can be employed without involving strict conditions, such as pH, temperature and so on.
    Type: Grant
    Filed: October 29, 1975
    Date of Patent: July 12, 1977
    Assignee: Caffaro, S.p.A., Societa per l'Industria Chimica ed Elettrochimica
    Inventor: Liborio Casale