Patents by Inventor Valentin I. Nefedov

Valentin I. Nefedov 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 purification of the off-gases resulting from the production of benzoyl chloride from phosgene
    Patent number: 4251457
    Abstract: A process for purification of the off-gases resulting from the production of benzoyl chloride by phosgenation of benzoic acid from phosgene comprising recovery of phosgene from said off-gases by means of a selective absorbent, i.e. benzoyl chloride at a temperature within the range of from 1.degree. to 40.degree. C. The recovered phosgene is recycled to the production of benzoyl chloride. The process is technologically simple, it makes possible to purify the off-gases without decomposition of phosgene thus preventing pollution of the environments; it also makes possible to simplify utilization of hydrogen chloride contained in the off-gases and, thereby, simplify preparation of commercial hydrochloric acid.
    Type: Grant
    Filed: June 11, 1979
    Date of Patent: February 17, 1981
    Inventors: Vladimir I. Kondratenko, Ivan N. Novikov, Isai N. Feldman, Boris G. Moiseev, Valery Y. Kolesnikov, Valentin I. Nefedov, Jury A. Fudaler