Patents by Inventor Palani Sivagnana Subramanian

Palani Sivagnana Subramanian 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 the time recovery of sulphate of potash (SOP) from sulphate rich bittern
    Patent number: 8182784
    Abstract: The present invention relates to a process for the recovery of sulphate of potash (SOP) from bittern. Kainite is obtained by fractional crystallization of the bittern. Kainite is converted into schoenite with simultaneous removal of NaCl and the filtrate (SEL) is used for production of KCl. Schoenite is reacted with aqueous KCl to yield SOP and the filtrate (KEL) is recycled in the kainite to schoenite conversion step. The production of KCl from SEL is carried out with the aid of dipicrylamine (DPA). Lime is treated with DPA in water for the production of highly soluble Ca (DPA)2, which in turn treated with SEL to produce insoluble K(DPA). K(DPA) is treated with HCl to produce KCl and insoluble DPA, which can be recycled for the production of Ca (DPA)2. The aqueous KCl thus obtained is treated with schoenite to prepare SOP. The KEL obtained along with SOP is recycled to generate schoenite.
    Type: Grant
    Filed: December 27, 2005
    Date of Patent: May 22, 2012
    Assignee: Council of Scientific & Industrial Research
    Inventors: Parimal Paul, Pushpito Kumar Ghosh, Kaushik Jethalal Langalia, Palani Sivagnana Subramanian, Suresh Eringathodi, Subrata Patra, Pragati Agnihotri
  • Process for the Time Recovery of Sulphate of Potash (SOP) From Sulphate Rich Bittern
    Publication number: 20100266482
    Abstract: The present invention relates to a process for the recovery of sulphate of potash (SOP) from bittern. Kainite is obtained by fractional crystallization of the bittern. Kainite is converted into schoenite with simultaneous removal of NaCl and the filtrate (SEL) is used for production of KCl. Schoenite is reacted with aqueous KCl to yield SOP and the filtrate (KEL) is recycled in the kainite to schoenite conversion step. The production of KCl from SEL is carried out with the aid of dipicrylamine (DPA). Lime is treated with DPA in water for the production of highly soluble Ca (DPA)2, which in turn treated with SEL to produce insoluble K(DPA). K(DPA) is treated with HCl to produce KCl and insoluble DPA, which can be recycled for the production of Ca (DPA)2. The aqueous KCl thus obtained is treated with schoenite to prepare SOP. The KEL obtained along with SOP is recycled to generate schoenite.
    Type: Application
    Filed: December 27, 2005
    Publication date: October 21, 2010
    Inventors: Parimal Paul, Pushpito Kumar Ghosh, Kaushik Jethalal Langalia, Palani Sivagnana Subramanian, Suresh Eringathodi, Subrata Patra, Pragati Agnihotri