The Reduction of Potassium Dichromate with Thiourea Dioxide

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  • NAKAMURA Hidetsugu
    Department of Chemical Engineering, Faculty of Engineering, Kyusyu University
  • KOOYAMA Toshimasa
    Department of Chemical Engineering, Faculty of Engineering, Kyusyu University
  • NAKAMORI Issei
    Department of Chemical Engineering, Faculty of Engineering, Kyusyu University

Bibliographic Information

Other Title
  • ニクロム酸イオンの二酸化チオ尿素による還元
  • ６価クロムを含む廃水の処理に関する研究　Ｉ　　二クロム酸イオンの二酸化チオ尿素による還元

Description

The reduction of K2Cr2O7 with (NH2)2CSO2 in 1 N H2SO4 solution was studied. From qualitative analysis of reaction solution and mass balance, reaction equation was determined as follows: 2Cr2O72-+3 (NH2)2CSO2 + 10 H+ 4 Cr3++ 3(NH2)2C0 + 3 SO42- + 5 H2O The rate of reduction can be expressed by the following 2 nd order rate equation dx/dt = k (n0-x ) (m0-3 x/2)where n0 (mol/l) is the initial concentration of K2Cr27, m0 (mol/l) is the initial concentration of (NH2)2CS02 and x (mol/l) is the concentration of K2Cr2O7 reacted at time t.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1976 (6), 1022-1023, 1976-06-10

    The Chemical Society of Japan

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