The thermal decomposition and hydrolysis of calcium carbamoyl phosphate.
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概要
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Calcium carbamoyl phosphate (<B>1</B>) was prepared by adding an aqueous calcium chloride solution to a reaction solution of KH<SUB>2</SUB>PO<SUB>4</SUB> with KOCN. <B>1</B> was unstable at room temprature. <B>1</B> was dehydrated to make anhydrous salt and thermally decomposed to liberate ammonia, cyanic acid, and carbon dioxide, finally resulting in the formation of calcium pyrophosphate in air. The apparent activation energies for the three endothermic peaks of the DTA curve were estimated to be 50.0, 83.9, and 148.3 kJ mol<SUP>－1</SUP> respectively. The hydrolysis of <B>1</B> in an aqueous solution apparently obeyed the first-order kinetics. The activation parameters for the hydrolysis of <B>1</B> were evaluated by using the <SUP>31</SUP>P NMR spectra of <B>1</B> with the lapse of the reaction time. The activation energy was 92.2 kJ mol<SUP>－1</SUP>; the activation enthalpy, 89.7 kJ mol<SUP>－1</SUP>, and the activation entropy, －6.3 e.u.
著者
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Suzuki Hiroki
Department Of Cardiology Asahi General Hospital
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Shimasaki Choichiro
Department Of Chemical And Biochemical Engineering Faculty Of Engineering Toyama University
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Suzuki Hiroki
Department of Industrial Chemistry, Faculty of Engineering, Toyama University
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