Patents by Inventor Igor D. Sokolov

Igor D. Sokolov 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 producing magnesium sulphate
    Patent number: 4264570
    Abstract: A method of producing magnesium sulphate comprises the steps of interacting ferrous sulphate with compounds including magnesium carbonates, oxides and hydroxides, with magnesium sulphate being produced. The step of interacting the starting reagents is conducted in water medium in the presence of carbon dioxide and is effected in the range of temperatures of 80.degree. to 100.degree. C.
    Type: Grant
    Filed: February 27, 1979
    Date of Patent: April 28, 1981
    Inventors: Igor D. Sokolov, Oleg D. Kashkarov, Jury S. Safrygin, Alexandr V. Muraviev, Nina K. Andreeva
  • Method of producing a complex mineral fertilizer
    Patent number: 4246019
    Abstract: A method of producing a complex mineral fertilizer is disclosed, comprising the steps of decomposing polyhalite at a temperature not exceeding 110.degree. C. in the presence of dilute nitric acid, neutralizing the obtained suspension with a substance selected from the group consisting of calcium carbonate, calcium hydroxide and calcium oxide, and separating the resultant product.
    Type: Grant
    Filed: February 21, 1979
    Date of Patent: January 20, 1981
    Inventors: Igor D. Sokolov, Jury S. Safrygin, Alexandr V. Muraviev, Nina K. Andreeva, Valery A. Zykov
  • Procedure for preparing nitrogen-potassium fertilizer
    Patent number: 4240818
    Abstract: A procedure is disclosed for preparing nitrogen-potassium fertilizer residing in interaction of potassium hydrogen sulfate with calcium nitrate, barium nitrate or strontium nitrate in an aqueous medium, followed by treatment of the reaction mass with ammonia, separation of the resulting slightly soluble sulfate and isolation of the desired product.
    Type: Grant
    Filed: March 12, 1979
    Date of Patent: December 23, 1980
    Inventors: Igor D. Sokolov, Jury S. Safrygin, Alexandr V. Muraviev, Nina K. Andreeva
  • Method of producing potassium sulfate
    Patent number: 4215100
    Abstract: A method of producing potassium sulfate consists in conversion of sodium sulfate with potassium chloride in an aqueous medium to yield glaserite and a glaserite solution. Then, the glaserite is decomposed with potassium chloride in water to obtain potassium sulfate and a sulfate solution which is returned to the first stage of conversion. The glaserite solution is cooled at temperatures ranging from +3.degree. to -8.degree. C., whereby mirabilite and a chloride solution are formed, the latter being evaporated to obtain sodium chloride and a concentrated chloride solution. Finally, the concentrated chloride solution is mixed with mirabilite, and the resulting suspension is delivered to the first stage of conversion of sodium sulfate with potassium chloride. The proposed method permits producing high-quality potassium sulfate with full utilization of the return solutions. The yield of potassium sulfate reaches 98.6% at a K.sub.2 O content of up to 53% by weight.
    Type: Grant
    Filed: May 18, 1978
    Date of Patent: July 29, 1980
    Inventors: Igor D. Sokolov, Vera A. Ostanina, Jury S. Safrygin, Tatyana I. Rutkovskaya, Nina V. Antonova, Rakhil E. Naginskaya