Patents Assigned to Montedison Fibre S.p.A.
  • Process for preparing methyl ester of O,O-dimethyl-dithiophosphoryl acetic acid
    Patent number: 3997630
    Abstract: The methyl ester of O,O-dimethyl-dithiophosphoryl acetic acid is prepared with minimal formation of by-products by reacting the sodium salt of O,O-dimethyl-dithiophosphoryl acid with the methyl ester of 2-chloroacetic acid at a pH of 5.5 to 7, at relatively high temperatures, of the order of 80.degree. to 100.degree. C, for reaction times of 10 to 15 minutes. The process can be carried out continuously.
    Type: Grant
    Filed: March 20, 1975
    Date of Patent: December 14, 1976
    Assignee: Montedison Fibre S.p.A.
    Inventors: Mario Bornengo, Saverio Grego
  • Process for the chloromethylation of styrene-divinylbenzene copolymers
    Patent number: 3997706
    Abstract: There is disclosed a process for chloromethylating styrene-divinylbenzene copolymers by treating the copolymers with methylal and thionyl chloride in a molar ratio not exceeding 2:1 and in the presence of a catalyst of the Friedel-Crafts type or which consists of an acid.As is known, the chloromethylation of cross-linked aromatic polymers of the styrene-divinylbenzene type is an important stage in the preparation of anionic exchange resins.
    Type: Grant
    Filed: November 27, 1974
    Date of Patent: December 14, 1976
    Assignee: Montedison Fibre S.p.A.
    Inventor: Lucio Galeazzi
  • Process for the catalytic synthesis of ammonia
    Patent number: 3998932
    Abstract: A catalytic process and apparatus for synthesizing ammonia wherein from 30 to 80% of the effluent gases containing at least 12 molar percent ammonia are recycled to the inlet of the catalyst bed.
    Type: Grant
    Filed: February 28, 1975
    Date of Patent: December 21, 1974
    Assignee: Montedison Fibre S.p.A.
    Inventors: Amilcare Collina, Emanuele Malfatti, Antonio Cappelli