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本文用热分析方法,对青海湖盐下氯镁石(MgCl_2·6H_2O)的热分解反应进行了TG、DTG、DTA、DSC的测定,配合分解气的化学分析、气相色谱分析和固体物的红外光谱分析,解释了DTA曲线,初步推断了MgCl_2·6H_2O热分解的机理。 MgCl_2·6H_2O 118℃—→熔融 MgCl_2·6H_2O 156℃—→MgCl_2·4H_2O+2H_2O MgCl_2·4H_2O 191℃—→MgCl_2·2H_2O+2H_2O MgCl_2·2H_2O 200℃—→MgCl_2·H_2O+H_2O MgCl_2·H_2O 251℃—→MgOHCl+HCl MgOHCl 461℃—→MgO+HCl总失重率为78.5％。用Kissinger法测得MgCl_2·6H_2O→MgCl_2·4H_2O+2H_2O的表观活化能为30.4KCal/mol。MgOHCl→MgO+HCl表观活化能为49.7KCal/mol。测定热分解反应的热效应为97.2KCal/mol。
In this paper, TG, DTG, DTA and DSC were used to determine the pyrolysis reaction of sub-salt pyrex (MgCl 2 · 6H 2 O) in Qinghai Lake by chemical analysis, chemical analysis of gas, gas chromatographic analysis and infrared Spectral analysis explained the DTA curve and concluded the mechanism of thermal decomposition of MgCl_2 · 6H_2O. MgCl 2 · 6H 2 O 118 ℃ → Melt MgCl 2 · 6H 2 O 156 ℃ → MgCl 2 · 4H 2 O + 2H 2 O MgCl 2 · 4H 2 O 191 ℃ → MgCl 2 · 2H 2 O + 2H 2 O MgCl 2 · 2H 2 O 200 ℃ → MgCl 2 · H 2 O + H 2 O MgCl 2 · H 2 O 251 ℃ - → MgOHCl + HCl MgOHCl 461 ° C - → Total weight loss of MgO + HCl was 78.5%. The apparent activation energy of MgCl 2 · 6H 2 O → MgCl 2 · 4H 2 O + 2H 2 O measured by Kissinger method is 30.4KCal / mol. The apparent activation energy of MgOHCl → MgO + HCl is 49.7KCal / mol. The thermal effect of the thermal decomposition reaction was determined to be 97.2 kCal / mol.